1. What is black welded steel tube?
Black welded steel tube refers to a welded pipe with a black surface. The "welded steel tube" indicates a steel pipe welded by steel plates or strips after being curled and formed, usually with a fixed length of 6 meters. The "black steel tube" is steel that is not galvanized and its color is caused by iron oxide on the surface. Sometimes it is called black iron pipe. Black steel pipes can be seamless carbon steel pipes or welded steel pipes without any treatment. When a steel pipe is forged, a black oxide scale forms on its surface, giving it the smooth finish typical of this type of steel pipe.
2.The manufacturing process of black welded steel tubes
The manufacturing process of black welded steel tubes typically involves the following steps:
(1)Raw Material Preparation
Raw materials of black welded steel tubes, usually consist of steel coils or strips.
(2)Forming
The steel strips are passed through a series of forming rolls to shape them into a cylindrical tube. high frequency induction welding, electric resistance welding, or other welding techniques can form the steel strips.
(3)Welding
Welding, also known as welding, is a manufacturing process and technology that uses heat, high temperature, or high pressure to join metal or other thermoplastic materials such as plastics. Once the steel strips are formed into a tube shape, the edges are welded together using a high-frequency welding process or another suitable method. The weld seam of the welded pipe is formed at this time.
(4)Sizing
After welding, the tube is passed through sizing rolls to ensure that the size of the welded tube adapts to different application environments and work requirements.
(5)Straightening and Cutting
The welded tube is then straightened and cut to the required length using saws or other cutting equipment.
(6)Surface Treatment
Remove welding slag, oxide scale, etc. on the welded pipe through pickling and other means.
(7)Testing and Inspection
This is an essential step in the production process of black welded steel tubes. The quality of the steel tubes is ensured through non-destructive testing and other methods.
(8)Packing and Shipping
Once the tubes pass inspection, they are packed and prepared for shipping to their destination.
3.Applications of black welded steel tubes
Black welded steel tube is a kind of pipe that is widely used. It has the advantages of corrosion resistance, high strength, good plasticity, and standardized production.Black welded steel tubes are used in a wide range of applications, mainly including the following fields:
(1)Construction field
Black welded steel tubes are used in building water supply, drainage, heating, fire protection, gas and other pipeline systems. They are also used in building supports, steel structure production, road guardrails, highway isolation barriers, bridge railings, pipeline systems, etc.
(2) Machinery manufacturing field
Black welded pipes are used to manufacture mechanical parts and components, such as lightweight and durable parts and structures for automobiles, aircraft, ships, trains, steel structures, agricultural equipment, etc.
(3)Ocean engineering field
Black welded steel pipes are used to manufacture submarine oil and gas pipelines, submarine optical cables, and offshore wind power equipment.
(3)Other fields.
Black welded steel tubes are also widely used in petroleum, chemical industry, electric power, mining, metallurgy, municipal gardens and other fields, such as transporting oil, gas and chemicals, power transmission and manufacturing high-voltage cables, coal mine fans, hydraulic load-bearing and other equipment.
Black welded steel tube refers to a welded pipe with a black surface. The "welded steel tube" indicates a steel pipe welded by steel plates or strips after being curled and formed, usually with a fixed length of 6 meters. The "black steel tube" is steel that is not galvanized and its color is caused by iron oxide on the surface. Sometimes it is called black iron pipe. Black steel pipes can be seamless carbon steel pipes or welded steel pipes without any treatment. When a steel pipe is forged, a black oxide scale forms on its surface, giving it the smooth finish typical of this type of steel pipe.
2.The manufacturing process of black welded steel tubes
The manufacturing process of black welded steel tubes typically involves the following steps:
(1)Raw Material Preparation
Raw materials of black welded steel tubes, usually consist of steel coils or strips.
(2)Forming
The steel strips are passed through a series of forming rolls to shape them into a cylindrical tube. high frequency induction welding, electric resistance welding, or other welding techniques can form the steel strips.
(3)Welding
Welding, also known as welding, is a manufacturing process and technology that uses heat, high temperature, or high pressure to join metal or other thermoplastic materials such as plastics. Once the steel strips are formed into a tube shape, the edges are welded together using a high-frequency welding process or another suitable method. The weld seam of the welded pipe is formed at this time.
(4)Sizing
After welding, the tube is passed through sizing rolls to ensure that the size of the welded tube adapts to different application environments and work requirements.
(5)Straightening and Cutting
The welded tube is then straightened and cut to the required length using saws or other cutting equipment.
(6)Surface Treatment
Remove welding slag, oxide scale, etc. on the welded pipe through pickling and other means.
(7)Testing and Inspection
This is an essential step in the production process of black welded steel tubes. The quality of the steel tubes is ensured through non-destructive testing and other methods.
(8)Packing and Shipping
Once the tubes pass inspection, they are packed and prepared for shipping to their destination.
3.Applications of black welded steel tubes
Black welded steel tube is a kind of pipe that is widely used. It has the advantages of corrosion resistance, high strength, good plasticity, and standardized production.Black welded steel tubes are used in a wide range of applications, mainly including the following fields:
(1)Construction field
Black welded steel tubes are used in building water supply, drainage, heating, fire protection, gas and other pipeline systems. They are also used in building supports, steel structure production, road guardrails, highway isolation barriers, bridge railings, pipeline systems, etc.
(2) Machinery manufacturing field
Black welded pipes are used to manufacture mechanical parts and components, such as lightweight and durable parts and structures for automobiles, aircraft, ships, trains, steel structures, agricultural equipment, etc.
(3)Ocean engineering field
Black welded steel pipes are used to manufacture submarine oil and gas pipelines, submarine optical cables, and offshore wind power equipment.
(3)Other fields.
Black welded steel tubes are also widely used in petroleum, chemical industry, electric power, mining, metallurgy, municipal gardens and other fields, such as transporting oil, gas and chemicals, power transmission and manufacturing high-voltage cables, coal mine fans, hydraulic load-bearing and other equipment.
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