Seamless steel pipes are indicated by outer diameter and wall thickness

Seamless steel pipes are indicated by outer diameter and wall thickness. Thick-walled seamless steel pipes are mainly used for mechanical processing, coal mining, hydraulic steel and other purposes.

Thick-walled seamless pipe production is divided into cold drawing and hot rolling, and the materials are divided into ordinary pipes and alloy pipes. According to the purpose, it is divided into seamless steel pipes for structure; seamless steel pipes for transportation; seamless steel pipes for boilers; high-pressure seamless steel pipes for boilers; high-pressure seamless steel pipes for fertilizer equipment; seamless steel pipes for geological brick exploration; seamless steel pipes with seams; seamless steel pipes for petroleum cracking; seamless steel pipes for ships; cold-drawn and cold-rolled precision seamless steel pipes; various alloy pipes.

Classification of thick-walled seamless steel pipes - hot-rolled thick-walled seamless steel pipes, cold-rolled thick-walled seamless steel pipes, cold-drawn thick-walled seamless steel pipes, extruded thick-walled seamless steel pipes, and top pipes.

Steel pipe weight calculation formula: [(outer diameter-wall thickness)*wall thickness]*0.02466=kg/m (weight per meter).

Thick-walled seamless stainless steel pipe theoretical weight calculation formula: (outer diameter-wall thickness) × wall thickness × 0.02491 = KG/M (weight per meter).

Thick-walled seamless alloy steel pipe theoretical weight calculation formula: (outer diameter-wall thickness) × wall thickness × 0.02486 = KG/M (weight per meter).

Tensile strength of thick-walled seamless pipe

Name Weighing symbol Unit Description

Strength Strength refers to the ability of metal to resist plastic deformation and fracture under external force

Tensile strength σb MPa When a metal specimen is stretched, the ratio of the maximum load it bears to the original cross-sectional area of the specimen before it breaks is called tensile strength. σ=Fb/So Where: Fb——The maximum force borne when the sample breaks, N (Newton); So--The original cross-sectional area of the sample, mm²

The biggest difference between thick-walled steel pipes and thin-walled steel pipes is the thickness of the pipe wall. Generally speaking, thin-walled steel pipes are drawn using thin-walled steel pipe technology, while hot-rolled thick-walled steel pipe technology is generally used. If it is used to distinguish between measurement units, then, generally speaking, wall thickness/diameter equal to 0.02 is the watershed between thick-walled and thin-walled steel pipes. Thin-walled steel pipes with wall thickness/diameter less than 0.02 are greater than thick-walled steel pipes. Thin-walled steel multi-purpose pipes. Multi-walled steel hollow parts used in blanks. Pressure is also an important channel of use.

Thick-walled steel is mainly used in water conservancy projects, petrochemicals, chemicals, electricity, agricultural irrigation, and urban construction. Used to transport liquids: water supply and drainage. Used for gas transportation: coal gas, steam, liquefied petroleum gas. Structural use: used as piling pipes for bridges; structural pipes such as docks, roads, and buildings.

The key to the quality of thick-walled steel pipes should be thickness uniformity. Uncontrolled wall thickness of thick-walled steel pipes will directly affect the quality and use of the steel pipes. Thick-walled steel pipes and large-diameter seamless steel pipes are generally used for various machining and thick-walled parts processing. Thick-walled steel pipes with uniform wall thickness will directly affect the quality of post-processing parts. Uncontrolled wall thickness of thick-walled steel pipes will lead to lax overall steel quality.
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