Welded pipe, also known as
welded steel pipe, is essentially made by welding steel plates or strips that have been coiled and formed. Welded steel pipe boasts a simple production process, high efficiency, a wide variety of specifications, and minimal equipment investment, but its strength is generally lower than that of seamless steel pipe. Since the 1930s, with the rapid development of continuous rolling of high-quality strip steel and advancements in welding and inspection technology, weld quality has continuously improved, leading to a growing variety and specifications of welded steel pipes, which have replaced seamless steel pipes in a growing number of applications. Welded steel pipes are categorized by weld seam type into straight seam welded pipes and spiral welded pipes.
First, Classification of Welded Steel Pipes
Welded steel pipes are categorized by application: They are further divided into general welded steel pipes, galvanized welded steel pipes, oxygen-blow welded steel pipes, wire casing pipes, metric welded steel pipes, roller pipes, deep-well pump pipes, automotive pipes, transformer pipes, electric-welded thin-wall pipes, electric-welded special-shaped pipes, and spiral welded pipes.
Second, Applications of Welded Steel Pipes
Welded steel pipes are widely used in boilers, automobiles, ships, lightweight structural doors and windows for buildings, furniture, various agricultural machinery, scaffolding, electrical conduit, high-rise racking, and containers. We can meet all customer requirements, and special specifications can be manufactured to meet user requirements.
Third, Theoretical Calculation Method for Welded Steel Pipe Weight
The theoretical calculation method for the weight of welded steel pipes follows a formula.
The theoretical weight per meter of steel pipe (steel density is 7.85 kg/dm³) is calculated using the formula: W = 0.02466 (D - S) S.
Where: W is the theoretical weight per meter of steel pipe, kg/m; D is the nominal outer diameter of the steel pipe, mm; S is the nominal wall thickness of the steel pipe, mm.
Fourth, Official Definition and Industrial Uses of Welded Steel Pipes
Welded steel pipes are made from steel plates or strips. Depending on the welding process, they are categorized as furnace-welded, electric-resistance-welded, and automatic arc-welded. Due to the different welding methods, steel pipes are divided into straight seam welded steel pipes and spiral welded steel pipes. Due to the end shape, they are further divided into round welded steel pipes and special-shaped (square, flat, etc.) welded steel pipes. Welded steel pipes are classified into the following types based on their materials and applications:
1. GB/T3091-1993 (Galvanized welded steel pipes for low-pressure fluid transportation). These are primarily used for conveying low-pressure fluids such as water, gas, air, oil, hot water for heating, or steam, and for other purposes. Their representative material is Q235A grade steel.
2. GB/T3092-1993 (Galvanized welded steel pipes for low-pressure fluid transportation). These are primarily used for conveying low-pressure fluids such as water, gas, air, oil, hot water for heating, or steam, and for other purposes. Their representative material is Q235A grade steel.
3. GB/T14291-1992 (Welded steel pipes for fluid transportation in mines). These are primarily used for compressed air, drainage, and axial gas discharge in mines. Representative materials include Q235A and B grade steel. GB/T14980-1994 (Large Diameter Electric-Welded Steel Pipe for Low-Pressure Fluid Transport). Primarily used for transporting low-pressure fluids such as water, sewage, gas, air, and heating steam, among other applications. Representative materials include Q235A grade steel.
4. GB/T12770-1991 (Stainless Steel Welded Steel Pipe for Mechanical Structures). Primarily used for machinery, automobiles, bicycles, furniture, hotel and restaurant decorations, and other mechanical components and structural parts. Representative materials include 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, and 0Cr18Ni11Nb.
5. GB/T12771-1991 (Stainless Steel Welded Steel Pipe for Fluid Transport). Primarily used for transporting low-pressure corrosive media. Representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc.
Threeway Steel is known as a professional supplier engaged in manufacturing and distributing a wide range of steel pipe, and our headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
