Black Steel Pipe, Black Carbon Steel Pipe

Black steel pipe is made from steel that has not been galvanised and is called black because of the dark coloured iron-oxide scale formed on its surface. it is used in the oil and petroleum industries to transport large quantities of oil and for the distribution of gas into homes. It is used in transporting water and gas in both rural and urban areas as we as for conduits that protect electrical wiring. It is also used for delivering high pressure steam and air.

The primary purpose of black steel pipe is to carry propane or natural gas into residential homes and commercial buildings. The pipe is manufactured without a seam, making it a better pipe to carry gas. The black steel pipe is also used for fire sprinkler systems because it is more fire-resistant than galvanized pipe.

Black steel pipe sizes:

Product	Out Diameter	Wall Thickness	Length
Black steel pipe	8.7mm-720mm	2.7mm-23.01mm	6mtr-18mtr

What is black carbon steel pipe?
Black carbon steel pipe refers to steel pipe with a higher carbon content, usually above 1.0%. Blackening treatment is a kind of surface oxidation treatment of steel. Its main applicable steel types are carbon steel and low alloy steel. Blackening treatment is to put the workpiece into a very concentrated alkali and oxidant solution and heat it (heating temperature is about 140°C, holding for 1-2 hours), so that a dense Fe304 film is formed on the surface of the steel.

The iron oxide film can isolate the air and prevent the interior of the steel from being oxidized to achieve corrosion resistance. Due to differences in operation and the chemical composition of the metal itself, the colors of this film include black, blue-black, tan, etc.

Uses of black carbon steel pipes:

Black carbon steel is often used for gas or water line pipes because it is low cost and can be welded using common methods. Some long-distance oil pipelines use black carbon steel pipes (such as black mild steel pipes) because such pipes can be connected on site and will not rust quickly. This steel can be used in climates or ground conditions that may accelerate corrosion, but may require additional protection, such as anodes. The anode is an embedded rod made of zinc that corrodes first when connected to the steel pipe.

Classification of black steel pipes:

1. Seamless black carbon steel pipe
Seamless black steel pipes are produced by perforating solid steel billets into hollow cylindrical shapes. Since there are no welds, they are stronger and suitable for high-pressure applications.

2. Welded black carbon steel pipe
Welded black carbon steel pipes are cylindrical shapes formed by bending and welding steel plates or steel strips. They are a cost-effective alternative to seamless pipes and are commonly used in a variety of industrial and structural applications.

Advantages of black carbon steel pipes:

1. Corrosion resistance
Because black carbon steel pipes have an oxide film on the surface, they have better corrosion resistance.

2. Beautiful appearance
The color of the steel pipe is black with a gloss, and the surface color of the steel pipe is highly uniform, consistent and beautiful.

3. Wide range of uses
Black carbon steel is steel with a high carbon content, usually between 0.3% and 2.0%. Due to the high carbon content, black carbon steel has high hardness and strength, as well as good toughness and ductility. This makes black carbon steel widely used in water and natural gas transportation, construction and machinery industries.

Difference between black carbon steel pipe and ordinary carbon steel pipe:

Carbon steel pipe (CS pipe) is made of steel ingot or solid round steel perforated into capillary tube, and then hot rolled, cold rolled or cold drawn. Carbon steel pipe occupies an important position in my country's steel pipe industry.

1. Anti-corrosion
Black carbon steel pipe has good corrosion resistance because of the black oxide film on its surface. At room temperature, the corrosion resistance of carbon steel pipe is relatively poor, and it is easily corroded by some chemicals such as oxides, acids, salts, etc. Surface treatment of carbon steel pipe is one of the important measures to improve its corrosion resistance. Commonly used surface treatment methods include electroplating, galvanizing, spraying, sandblasting, etc.

2. Price
Because the surface of black carbon steel pipe is treated with black, its cost is higher than that of ordinary carbon steel pipe.

Application of Seamless black carbon steel pipe

1. Low and middle pressure fluid pipeline
2. Casing Pipe
3. Boiler Pipe
4. Petroleum and natural gas industry
5. Chemistry industry
6. Electric industry

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