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. 

How To Hot dipped Galvanizing Without Wasting Raw Materials

Do you know how hot dipped galvanized pipes are made from? Do you know why hot-dipped galvanized pipes are with strong anti-corrosion? It owes to a professional technique-hot dipped galvanizing.

Let us know more about it on details.

Hot Dip Galvanizing is a unique process. When clean steel is immersed into molten zinc, a series of zinc-iron alloy layers are formed by a metallurgical reaction between the iron and zinc, providing a robust coating which is an integral part of the steel.

Hot dip galvanizing offers coverage both externally and internally within hollow sections, it self-repairs when damaged, sacrifices itself to protect the base metal, is environmentally sustainable, has good impact and abrasion-resistance and a maintenance-free life of 50 years or more. Galvanized steel is widely used in applications where corrosion protection is needed and can be identified by the crystallised pattern on the surface (often called a ‘spangle’).

What You Should Know About A Professional & Ambitious Group--Tianjin Tewoo

 Do you want to learn about professional knowledge of carbon steel products as well as a reliable manufacturing and exporting group if you want to import such kinds of products? 

JUST US-TIANJIN TEWOO

I'm Sigrid Sun from the Metal Department of Tianjin Tewoo Group. We are a state-owned enterprise with a comprehensive business scope, covering industries like mining, trading, logistics, finance, and much more. The Metal Department is specifically engaged in the manufacturing and exporting of quality steel products, serving international markets for over 30 years. We have 18 integrated production lines for the making of all kinds of steel carbon pipes, including round/square/rectangular ERW pipes, pre-galvanized and hot-dipped galvanized ones, seamless pipes, steel conduit, stainless pipes, etc. All products are manufactured by the standard of official ISO & EN & API certifications. Our quotations are usually the best in the industry due to massive productions and upstream cost control, wining us a total of 100,000 tons annual export to the customers from North & South America, Middle East, Southern-East Asia, Europe, Australia, etc.

Please shoot me an email for specification, stock availability, customization, or any other questions you may have. Free samples are certainly available. We will make sure to provide you the best quotation around. A business video clip and detailed company brochure are also available if you may need.