5 Important Ways to Packaging Steel Pipes

 As we all know, packaging is extremely important for delivering steel pipes, especially for prevention of rust of steel pipes. Please go ahead to read 5 methods of packaging.

1. Hessian/pvc cloth bundles with pvc box strap or hexagonal bundles details not given in customer's order as per customer requirement. 

2. Wooden crate for domestic supply as per customer requirement.

3. Wooden box made of treated wood or plywood sheet recommended for long, thin walled& u'bend tubes as per customer requirement.

4. Bare tube bundles for big diameter & heavy thickness piping materials.

5. Tubes with pvc sleeve and packed in wooden boxes for polished tubes if customers require.

Numerous Experts Share Their Professional Methods For Testing Pipes

 Knowing the strength of the materials you use is important across many industries. Especially for fields concerning big structures (like buildings, ships space shuttles), you would have to be aware of how much strain each part can take before breaking. They are crucial in many calculations that are made for the safety of the people involved or the effectiveness of the structure. Hence, it's extremely significant to know methods for testing pipes. 

There are several destructive testing methods that experts use:

1. Aggressive environment testing

The materials that are being tested are usually expected to brave different kinds of environments once used. Aggressive environment testing determines the fatigue and fracture points of the specimen when under specific weather conditions. Factors that impact the materials include temperature, pressure, salinity, humidity, chemical exposure, and other corrosive natural forces. By mimicking the environment where it will be used, you'll see how well a material will be able to perform.

2. Corrosion testing

Somewhat similar to aggressive environment testing, corrosion testing figures out the corrosion point of a material when exposed to freshwater and seawater. As you can expect, this type of testing is done on materials that will most likely be exposed to aqueous corrosion like steel pipes.

3. Fatigue testing

This DT method is used to test how much pressure, whether it be constant or variable amplitude loading, or strain a welded joint can take in open-air and seawater environments. The component will take as much fatigue as possible until it breaks, telling the scientists how strong welded parts or heat-affected areas of a structure can be.

4. Hardness testing

The hardness of a material is its ability to resist deformation. It can also be used to determine how well a material can perform when under extreme stress. For this method, a Rockwell scale and an indenter are commonly used. The indenter will penetrate the material at a constant force, and the depth of penetration will show the hardness of the material. 

5. Tensile testing

This time, the material's tensile strength is put to the test. The specimen will be compressed or elongated, depending on the test's parameters, until it breaks or fails. The machine will apply controlled pressure on the specimen to measure its ultimate tensile strength, breaking strength, and maximum elongation or reduction. 

7. Hydrogen testing

Hydrogen is another element that can cause corrosion. That's why there is a special DT method that measures how much hydrogen it would take before corrosion occurs in a material. As always, the parameters of the test would depend on the product, meaning the temperature and stain rates may vary.

8. Residual stress measurement

When a material experiences external stresses, sometimes internal stresses are still present when the cause of the external ones are gone. At times, these internal stresses can also affect surface stress. Scientists use complicated methods to accurately measure internal stress such as synchrotron diffraction, neutron diffraction, and x-ray diffraction. By testing for internal stress, engineers will be able to more accurately determine stress distribution throughout the material, which may affect the critical assessment of the structure. 

Tianjin Tewoo Can Help You Make Seamless Pipe To 100% Excellence

As we all know, our group, Tianjin Tewoo,  is the professional manufacturer and exporter of seamless pipes, which makes them to 100% excellence because our production lines are with extreme specificality.

Two processes are involved for manufacturing seamless pipes: the cross-rolling method and the extrusion method. The first is generated by perforating the tube with a diagonal roller and extending it with a rolling mill. This procedure is quick to perform, but the tube blank requires high processability requirements. This method is the most recommended one for the production of carbon steel and low alloy steel tubes.

The second uses a drilling machine to bore a rough pipe or steel ingot. It then punches into a steel tube using an extruder. This process is definitely less efficient and is usually used to produce high-strength alloy steel tubes.

Both ways of manufacturing seamless pipe must first heat the tube blank or ingot. The resulting is that steel pipe can be called hot-rolled pipe. Hot-working pipes can sometimes be cold-worked, depending on the final requirements. For this, there are two methods: cold drawing( pulling the steel pipe through the extrusion die to make it longer and thinner) or cold rolling( hot rolling is applied to the cold working method). Cold working can improve the dimensional accuracy and finish of pipe processing and improve the mechanical properties of materials.

Thus, please don't hesitate to communicate with us if you have any seamless pipe inquiries: acero.sigridsun@gmail.com

The Ultimate Guide To Choosing The Right Pipe Fittings

 When it comes to plumbing and piping systems. selecting the right pipe fittings is absolutely crucial. Pipe fittings hold a pivotal position in plumbing and piping systems. They are vital components that link and join pipes, ensuring the smooth flow of fluids, gases or solids. Furthermore, they are tasked with maintaining the structural integrity of the system, preventing leaks, and facilitating easy maintenance and repairs. Whether your project is on a residential scale or involves a large-scale industrial installation, the performance and longevity of your system hinge greatly on the quality and appropriateness of the fittings you select. In this comprehensive buyer's guide, we will delve into the key factors to take into account when choosing pipe fittings. 

1. Material

One of your initial decisions must revolve around the material of the pipe fittings. Some common materials to contemplate include:

Stainless steel: Renowned for its exceptional corrosion resistance and durability, stainless steel fittings are versatile and suitable for various applications, encompassing water, gas, and chemicals.

Brass: Brass fittings are a favored choice for water and gas systems due to their corrosion resistance and ease of machining.

Pvc: Pvc fittings, known for their lightweight nature and corrosion resistance, prove excellent for water and wastewater systems.

Copper: Copper fittings have a significant presence in plumbing systems thanks to their heat resistance and long-term reliability.

Carbon steel: Sturdy and capable of handling high-pressure scenarios, carbon steel fittings are often employed in industrial settings.

The material you opt for should align seamlessly with your project's specific requirements and the type of fluid or gas your system will convey.

2. Type of Fittings

Pipe fittings present a variety of types, each designed with specific purposes in mind. The most prevalent types include:

Elbows: Used to alter the direction of pipe runs.

Tees: Craft a 90-degree branch connection.

Reducers: Employed to connect pipes of varying sizes.

Couplings: Unite two pipes together securely.

Adapters: Facilitate connections between pipes with different end types, such as threaded or socket weld.

Nipples: Short pipe segments designed for extending a fitting or connecting two other fittings.

Flanges: Enable easy assembly and disassembly of pipes.

The type of fitting that suits your needs hinges on the layout and requisites of your piping system.

3. Size and Dimensions

Ensuring a harmonious match between the size and dimensions of the fittings and the pipes they will link is absolutely vital. Fittings are available in a spectrum of sizes, typically measured in inches or millimeters. Incorrect sizing can lead to undesirable consequences such as leaks, pressure drops or flow restrictions. 

4. Pressure and Temperature Ratings

Always take into account the pressure and temperature conditions your pipe fittings will be exposed to. It's imperative that the fittings you select have the capacity to withstand the maximum pressure and temperature levels within your system, thereby averting any potential failures or safety hazards.

5. Compliance with Standards

To warrant the quality and reliability of your chosen pipe fittings, seek out products that adhere to industry standards and possess relevant certifications. Manufacturers who uphold established standards are more likely to produce fittings that are dependable and safe. 

Besides, selecting reputable manufacturers and suppliers is tantamount to choosing the right fittings. Here are some valuable tips to assist you in identifying trustworthy sources:

1. Research and Reviews

Commence your journey by conducting thorough research on pipe fittings manufacturers and suppliers. Delve into online reviews, testimonials and case studies from past customers. This will furnish you with valuable insights into their reputation and the quality of their products.

2. Industry Experience

Scrutinize the track record of the manufacturer or supplier within the industry. Companies with a lengthy history of producing high-quality fittings are more likely to deliver reliable products.

3. Product Range

Opt for a manufacturer or supplier who offers a wide-ranging selection of pipe fittings. This ensures that you can find fittings tailored to your precise needs without any compromise on quality.

4. Certifications and Standards

Ensure that the manufacturer adheres steadfastly to industry standards and possesses pertinent certifications. For instance, ISO certifications underscore a commitment to quality control and consistency.

5. Customer Support

Exceptional customer support is indispensable. particularly when you encounter challenges or have inquiries concerning the products. Ascertain that the manufacturer or supplier extends responsive and helpful customer service.

When it comes to choosing the right pipe fittings for your project, meticulous attention to detail is paramount. The material, type, size, pressure, and temperature ratings, as well as compliance with industry standards, all contribute to the success of your plumbing or piping system. Moreover, selecting trustworthy pipe fittings manufacturers and suppliers is a crucial step in this process.

How Tianjin Tewoo Made Erw Pipe Successfully In 7 Days

Our Tianjin Tewoo is the professional manufacturer of steel pipes, such as ERW pipes, galvanized pipes, steel conduit etc for over 30 years with 18 production lines. You all know that ERW pipes offer exceptional strength and durability for fluid transmission and other structural applications, doubling down on the numerous qualities of steel. We can make ERW pipes successfully within 7 days by our professional manufacturing technique.

ERW is an abbreviation for electric resistance welding, and it is used to specify a specific technique in pipe manufacturing. Two uncoiled rolls of steel sheets are joined together without the use of a welding filler wire or metal in this technique. Instead, the sheets are welded using an electrical current and a continuously applied force. Unlike other types of pipe fabrication, ERW pipe fabrication doesn't begin with a billet that is rolled before being refined by a piercer point. 

First, Cold-forming

Cold-forming is the process of working or forging a metal specimen at room temperature-in ths example, steel. This implies that the forging takes place below the recrystallization temperature of the steel, which aids in the removal of impurities from the material. When this happens, the grain structure of steel changes to become finer and less coarse, resulting in a hardened material with very little waste in the machining process.

This is one of the most important steps in the manufacturing of ERW pipes. A sheet of steel is cold-rolled or molded into a cylindrical shape. Cold-forming is significantly faster and more appropriate for high-speed manufacturing since is doesn't require any additional heat-processing techniques. Before the welding stage, the permanent hardening of the cold-forming process results in a substantially stronger steel specimen.

Second, Passage of current

ERW pipe formation is a continuous process that takes place on continually moving equipment. Despite this, the many stages that constitute it may still be identified and described. There is an electrical current flow between the resulting edges of the cylindrical steel after the cold-forming process. To retain the cylindrical shape, they are progressively brought together with the current with the assistance of an induction coil and a smooth pressure roll.

The use of an induction coil results in a non-contact heating technique for the material. It's normally placed around the steel specimen that is being inducted. An impeder is also added to the ERW machining process to regulate the quantity of electrical current spread throughout the material. This implies that the energy is redirected toward welding the steel joints.

Third, Forming

Another step that is involved in ERW fabrication is forming. As previously stated, the steel coils that pass through the ERW-making machine create cylindrical-shaped sheets that must be welded using electrical current. To demonstrate this, the sheets first seem to be u-shaped, with multiple open welded seams, or edges, as they're known. 

The machine guarantees that the resulting u-shaped steel remains in its formation throughout the process to avoid faults and imperfections in the production of the ERW pipe. The steel sheet is initially rolled before being subjected to gage forming, resulting in a uniformed u-shaped cross-section.

Forth, Welding

If you've ever seen seamless and non-seamless pipes, it's clear to see where the production processes begin to change when compared to ERW pipes. Seamless pipes may seem identical to ERW pipes in appearance, although the non-seamless pipes use a non-contact electrical current. Because seamless pipes are not welded, they have a continuous smooth surface with no apparent edges or joints. Seamed pipes, on the other hand, may require a welding filler, which is not found in the ERW welding process.

Pipe makers generally ensure that the welded pipes they create may be used for a variety of applications, such as HVAC systems or petrochemical facilities. Despite strict quality control, incidences of uneven welding pressure might occur in seamed pipes. Some issues that may arise include pipe leakage or damage, which is significantly less likely with ERW pipes because of their consistent pressure and strength distribution.

Fifth, Sizing and Cutting

After welding the u-shaped joints together, the ERW pipe can now be subjected to post-processing procedures to improve the material's characteristics and use.

Depending on the use, it's sized and cut to particular specifications, With this in mind, ERW pipes may be cut into a broad range of pipe sizes and lengths, with differences in thickness, diameter, and length. It may also be able to shape the pipe ends further with an end-facing machine to accept different fittings. 

9 Little-Known Ways To Prevent Rust

 Rust can quickly become a big problem. It ruins the functionality and stability of important machinery and it can cost your business thousands. Knowing how to prevent rust effectively can save you money and prevent serious problems. As with many things, some small preventative measures upfront can save you lots of money, time, and frustration later on. We've collected the best ways to prevent rust, so you can find a strategy that works best. 

To prevent rust is to prevent moisture from reaching th metal, or by using a material that corrodes more slowly. The following are 9 best ways to prevent rust.

1. Use an alloy: The use of alloys, like stainless steel, is one of the most common ways to prevent rust, or slow it down. Stainless steel isn't suitable or economical for all applications, but it will work for many.

2. Apply oil: A coating of oil will help to prevent rust or slow it down, since it inhibits moisture from reaching the iron in the metal. However, an oily surface might be problematic for some tools or machines and poses environmental and human health concerns.

3. Apply a dry coating: Special rust preventative products dry with no residue and form a protective barrier over metal parts and equipment. These are effective for products in use, in shipping, storage and more.

4. Paint the metal: A good quality paint will slow down rusting by preventing moisture from reaching the metal.

5. Store properly: Store metal parts or products in a low-moisture area, or inside a temperature and humidity-controlled environment to significantly slow down rust. Use of desiccant drying agents in this storage are also helpful.

6. Galvanize: Galvanizing coats iron or steel in zinc to protect from rust. Zinc corrodes at a much slower rate than iron or steel, so it's highly effective for slowing rust.

7. Bluing: This process creates a layer of magnetite over the metal to prevent rust. The metal must be regularly oiled to maintain rust resistance, and it will turn blue or black in the process.

8. Powder coating: A layer of acrylic, vinyl, epoxy or other substances will prevent moisture from reaching the metal, thereby preventing rust.

9. VCI packaging: Vapor corrosion inhibitors (VCI) are a type of chemical compound that when infused into various packaging materials, protect metals by emitting rust eradicating vapors into an enclosed air space to prevent corrosion on a metal surface.

Can You Find The Problem With Steel Pipe

Have you found the problems with steel pipes? Details are as following:

1. The internal and external quality of steel pipes

The appearance quality problems of steel pipes include: external folds, cracks, splits, holes, punctures, external threads, corrections, bumps, pitted surfaces, rolling, folding.

2. Quality problems of geometric dimensions

Outer diameter tolerance, wall thickness tolerance, length tolerance, ellipticity tolerance, bending(straightness tolerance), inner hexagon, steel tube unilateral

3. Unqualified quality problems of physical and chemical properties

According to the contract or standard steel pipe, the chemical composition (mixed steel or alternative steel), tensile strength, yield strength, impact performance, hardness, elongation, flattening performance, flaring, bending performance etc are unqualified, and the main reasons why above problems occur are that one is the production of mixed materials, the other is the contract to replace steel and the third is that the production process is not strictly controlled.

4. Quality problems of tubing and casing threads

Velcro, trip, tight pitch of thread, thread grease, eccentricity of threaded thread, unfastened coupling

5. Quality problems of users in the process of processing and use

There are middle cracks, pores, processing fractures, inclusions

6. The quality of packaging labeling

Rust, unclear markings, loose bundles, incorrect markings

Are You Still Confusing How To Choose Between Steel Pipe and Steel Tube

Are you still confusing how to distinguish between steel pipe and steel tube? We, Tewoo, can help you to make clear and we are here to help you provide a smaller batch, a larger load or a mixture of the two types.

Pipes and tubes look relatively similar, and might even be confused for the same thing among layment. But in reality, they're very different in terms of not only their dimensions and size, but alos their applications and several important factors. They're also almost never interchangeable. Here are some basic differences to note regarding metal pipe compared to metal tube.

Strength and Shape

For applications that require the strongest possible steel, tube is generally the way to go. It's known to be significantly stronger than pipe, and one of the strongest metal formats period.

While shape isn't normally the deciding factor for your project, it's a good way to tell the two steel types apart. The rule of thumb here is that steel pipe is always round, while steel tube can come in a few different shapes-square, rectangular, or even round itself in some cases.

General Size and Measurement 

In general, you'll be alble to find steel pipes in larger sizes than steel tube will range up to. As for measuring the two, each has its own set of factors used:

Pipe: Metal pipe comes with an inside diameter(called the nominal diameter) and a schedule, which refers to the thickness of the metal's wall. This is because metal price is often used for the transfer of gas and liquids, meaning the most important factor for you is the size of the opening through which these elements can pass-rather than the outer dimensions.

Tube: Metal tube is measured based on outside diameter, plus set ranges of wall thickness. 

Rigidity

With a few exceptions(namely copper and brass), metal tubes are usually among the more rigid products you'll find-but they can usually be shaped with some effort, depending on the specific type. Pipes, though, are known to be extremely rigid, meaning they cannot be shaped without specialized equipment.

Rolling and Galvanizing

In general, you can purchase metal tube in hot-rolled or cold-rolled steel format. Piping, however, is generally available in black steel, which is hot-rolled. One area where the products are similar: Both can be galvanized.

Telescoping

Metal tubing can generally can be telescoped and is often used for its purpose. A material called DOM(Drawn over Mandrel) is the best tube for telescoping due to the lack of a flash weld inside the tube. Pipe does not have this same flash weld, however. 

Applications

When it comes to transferring gas or liquid, as we noted above. Only pipes are a proper solution. They're pressure-rated and intended for this specific use, while tubes are made of structural applications in various areas.

For more on metal steel vs metal tube, or to learn about any of our steel services or buy steel online, speak to us(acero.sigridsun@gmail.com)

Why Carbon Pipes Are Rusty

Are you always confused why carbon pipes are rusty in a relatively short time and how to solve this little annoyed problem? Let me unravel the mystery.

Carbon steel pipe is a kind of steel with high carbon content, and it is prone to oxidation reaction in humid environment, forming iron oxide, that is rusting because its main component contains iron element. Although carbon steel is not a completely corrosion-resistant material, it is susceptible to environmental corrosion, which aggravates the occurrence of rust because its surface has not been specially treated. 

There are four reasons for rusting of carbon steel pipes as follows:

1. Medium that causes product corrosion

Moist air, hand sweat or dirt from product contact, water acid, alkali, salt and chemical gases remaining on the metal surface may cause metal corrosion.

2. corrosion resistance of metal

Metals that are prone to rust include pig iron, carbon steel and structural alloy steel. Meanwhile, stainless steel, high-temperature alloys and titanium alloys will rust in special environments. 

3. Parts prone to rust

The parts that are easy to contact, adhere to and accumulate corrosive substances include grooves, seams, holes, edges, joint surfaces, hand contact surfaces, parking surfaces, rough surfaces, newly processed surfaces, or sandblasting polished surfaces etc, which are prone to rust. 

4. Corrosion-prone environment

Generally speaking, processing workshops such as pickling, heat treatment, electroplating, welding, painting, electrolysis etc are more prone to corrosion than mechanical processing workshops, because these workshops have a large amount of corrosive media.

However, there are indeed effective and strong rust prevention methods for carbon steel pipes as follows: 

1. Passivation

Rust is prevented by passivation. Passivation treatment is to form a protective oxide layer on the surface of carbon steel, which can prevent the steel from being further corroded by the environment.

2. Surface coating

Surface coatings such as galvanizing and painting can effectively prevent carbon steel from rusting and form a protective film on the surface, which can resist corrosion from the external environment and improve the hardness and durability of the surface.

3. Cement coating

Cement coating is another method for carbon steel to prevent rust. Although cement will absorb water, it will directly form a protective layer on the surface of the steel pipe. Therefore, cement coating is also a method of rust prevention. 

4. Anti-rust oil treatment

The anti-rust oil added with anti-rust agent can prevent the rust of carbon steel, and well can be used as anti-rust treatment for engineering machinery, automobile engine parts and so on. The use of high-density grease and preservatives can prevent oxygen from entering the surface of carbon steel, thereby reducing the occurrence of oxidation reactions. 

5. Electronic rust removal technology

The application of electronic rust removal technology can completely remove the rusty substances generated on the surface of carbon steel without changing the physical properties of the steel, so as to achieve the purpose of rust prevention.

In a word, Tianjin Tewoo (acero.sigridsun@gmail.com) can be your reliable partner to provide products with best quality and related technical knowledge and service.

4 Secrets To Distinguishing Between Carbon Steel Pipe and Black Steel Pipe

 It's extremely important for you to understand the differences between carbon steel pipe and black steel pipe when doing any kind of home remodeling or construction. Do you know how to distinguish them? Let us see below in details.

Composition

Carbon steel pipe and black steel pipe are both made of iron, carbon and other elements, but the main difference between them is that carbon steel pipe has less carbon, which makes it harder and more brittle, allowing it to be welded, machined, and formed more easily.

Manufacturing Process

Carbon steel pipe is made by first heating the iron ore to a high temperature (about 2,100F), then adding carbon to form a liquid slag. Then this slag is cooled and formed into a cake, which is rolled into a pipe shape. Black steel pipe is made in a similar way, but its main difference is that the iron ore is not heated as high (only about 1,700F), and there is no need to add carbon.

Properties

The main difference between carbon steel pipe and black steel pipes lies in their properties. Carbon steel pipe is harder and more brittle than black steel pipe, and is also easier to weld, machine, and form. Black steel pipe is vice versa, so it is more difficult to weld, machine, and form than carbon steel pipe.

Uses

Carbon steel pipe is most commonly used for structural applications such as buildings and bridges, and it can also be used for transportation of fluids such as oil and gas. While on the contrary, black steel pipe is only most commonly used for transportation of fluids such as water, gas, and oil. 

Conclusion

When it comes to choose between carbon steel pipe vs black steel pipe for your next project, there are several factors to consider including price point, durability, strength, and corrosion resistance. Carbon steel pipe is strong yet affordable while black steel pipe offers greater durability but cost more upfront. Ultimately the decision depends on what type of application you need the piping for, that is to say, if you need something long lasting that won't corrode easily, black steel pipe may be a better option, while if you mainly concern on budget, carbon steel pipe might be the way to go. No matter which type you choose, just remember that both have their own advantages, so make sure you weigh them carefully before making your final decision.

2 Methods To Produce Welded Steel Pipes

There are mainly 2 methods for producing welded steel pipes:

1) Production of seamed steel pipes by welding

The production of welded steel pipes uses straight strips or coiled strips as raw materials. The commonly used welding methods include furnace welding, resistance welding and arc welding. There are two kinds of weld seams: straight seam and spiral seam. The furnace welding method can only produce straight seam welded pipe, and its product diameter is 10-114mm, and the wall thickness is 2-10mm. The diameter of the straight welded pipe produced by the resistance welding method can reach 620mm, and the wall thickness is 0.4-20mm; the diameter of the spiral welded steel pipe can reach 3660mm. The arc welding method is suitable for high-quality steel and alloy steel. and is often used to produce spiral welded pipes with a diameter of more than 1000mm. 

2) Production of steel pipes with cold drawing machines

Using hot-rolled seamless steel pipes or welded steel pipes as blanks, steel pipes and small-diameter steel pipes with little change in wall thickness are produced. Steel pipes can be made into circular, rectangular, triangular and other cross-sectional shapes by cold drawing. Usually the product diameter is 6-65mm, and the wall thickness is 1-5mm.