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Black steel pipe

Black steel pipe mainly transports propane or natural gas to residential and commercial buildings. The price is more competitive as per standard.
Product name:Black steel pipe, Carbon steel seamless pipe,Seamless steel pipe, seamless pipe, carbon seamless pipe, bl steel pipe, smls steel pipe, cs pipe, mild steel pipe, mild smls pipe
Materials:  GR.B, X42, X56, P11, P22, ST37, ST44, ST52, S235JR, S355JR, STP430.
Standard:API 5L, A106, A53, A335, A333, DIN1629, DIN2448, GOST8731, JIS G3454.
Product Details

Black steel pipe is made of steel that has not been galvanized. Its name comes from the scaly, dark-colored iron oxide coating on its surface. It's used in applications that don't require galvanized steel.

Black steel pipe type

Mide seamless  steel pipe, Hot rolled seamless steel pipe, Cold drawn seamless steel pipe, Boller steel pipe, Fluid transmission pipe, Wall thickness steel pipe 

Blcak steel pipe specification:

Outer diameter: 1/4"-40" (13.7mm-1016mm

Wall thickness: 1.5mm-80mm

Length: 3m-15m

Black steel pipe inspection

Hydrostatic testing, ultrasonic testing, eddy current testing, magnetic particle testing, impact testing, hardness testing, etc.
Black steel pipe package and storage

Safe and Seaworthy packing suitable for export; As per customer’s requirement.

Black steel pipe feature

Black iron is the uncoated steel and is also called as black steel. When steel pipe is forged, a black oxide scale forms on its surface to give it the finish which is seen on this type of pipe. Because black steel is subject to rust and corrosion, the factory also coats it with protective oil. Those black steel are used for manufacturing pipe and tube, which will not rust for a long time and requires very little maintenance. 

Black steel pipe is widely applicable for ordinary uses in water, gas, air and steam, black steel pipes and tube are utilized for gas distribution inside and outside the house and for hot water circulation in boiler systems. It is also used for line pipes in oil and petroleum industries, for water wells and for water, gas and sewage purposes.

Black steel pipe quality inspection:

1. Our factory has its own "experimental testing center".CNAS Laboratory Accreditation Certificate

2.Control quality strictly.The first pass is the quality inspection on the production line,The second pass is full inspection of the  production quality .

3.We have got internationally recognized certificates, ISO, CE, LR,Philippine certificate,also support third-party testing,as SGS, BV, ect.

Typical black steel pipe coatings & Finishes:

Galvanized – Covered with a protective zinc coating on steel to prevent the material from rusting. The process can be hot-dip-galvanizing where the material is dipped in molten zinc or Electro-Galvanized where the steel sheet from which the pipe is made was galvanized during production by an electro-chemical reaction.

Uncoated – Uncoated Pipe

Black Coated – Coated with a dark colored iron-oxide

Red Primed – Red Oxide Primed used as a base coat for ferrous metals, gives iron and steel surfaces a layer of protection

Standard of Carbon steel seamless pipe


Black and hot-dipped zinc-coated steel pipes welded and seamless

ASTM A106 Gr.B

Seamless carbon steel for high temperature service


Seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes


Seamless carbon steel boiler tubes for high pressure


Seamless Medium-carbon boiler and super heater tubes


Seamless alloy-steel boiler, super heater, and heat-exchanger tubes

ASTM A333 GR.6

seamless and welded carbon and alloy steel pipe intended for use at low temperatures.

ASTM A335 P9,P11,T22,T91

Seamless ferritic alloy-steel pipe for high-temperature service

API Spec 5CT J55/K55/N80/L80/P110/K55

Seamless steel pipe for casing

API Spec 5L PSL1/PSL2 Gr.b, X42/46/52/56/65/70

Seamless steel pipe for line pipe

DIN 17175

Seamless steel tube for elevated temperature


Cold drawn seamless prevision pipe

DIN 1629 

Seamless circular unalloyed steel tubes subject to special requirements

black steel pipe Black steel pipe manufacturer

black mild steel pipe manufacturer black mild steel pipe

Black steel pipe is uncoated steel, also known as black steel. The dark color comes from iron oxide that forms on its surface during the manufacturing process. When a steel pipe is forged, a black scale forms on its surface, giving it the finish seen on this type of pipe.

Black steel pipe use

The main use of black steel pipes is to transport propane or natural gas to residential and commercial buildings. The pipe has no seams, making it a better pipe for carrying gas. Black steel pipe is also used in fire sprinkler systems because it is more fire resistant than galvanized pipe. The main use of galvanized pipe is to transport water to homes and commercial buildings. Zinc also prevents deposits from building up that could clog water pipes. Galvanized pipe is often used as scaffolding because of its corrosion resistance.

How to distinguish this galvanized steel pipe from black steel pipe?

1. Check the color of the pipes. Black steel pipes are flat black and galvanized pipes are silver grey. Black steel pipe is darker than galvanized pipe.

2. Distinguish differences by the material they carry. Galvanized pipes are usually used for water transportation, and black steel pipes are used for gas transportation.

3. Tell the pipes used from the year. If the pipe was installed after the 1950s, it is likely black steel, since black steel pipe was used later than galvanized pipe.

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