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Performance of China 1020 seamless steel pipe

From: Shandong Baote Metal Products Co., Ltd.  DATE: 2022/3/29  Hits: 4379

Performance of China 1020 seamless steel pipe

Tensile strength of 1020 Seamless Steel Pipe of China Steel Pipe Factory σ B (MPA): ≥ 410 (42) yield strength σ S (MPA): ≥ 245 (25) elongation δ  (%): ≥ 25 reduction of area ψ  (%): ≥ 5, hardness: not heat treated, ≤ 156hb, sample size: sample size 25mm Heat treatment specification and metallographic structure: Heat tre...

Tensile strength of 1020 Seamless Steel Pipe of China Steel Pipe Factory σ B (MPA): ≥ 410 (42) yield strength σ S (MPA): ≥ 245 (25) elongation δ  (%): ≥ 25 reduction of area ψ  (%): ≥ 5, hardness: not heat treated, ≤ 156hb, sample size: sample size 25mm


Heat treatment specification and metallographic structure:


Heat treatment specification: normalizing, 910 ℃, air cooling. Metallographic structure: ferrite + pearlite.


Delivery status of China Baote Steel Pipe: delivery without heat treatment or heat treatment (annealing, normalizing or high temperature tempering). If delivery in heat treatment state is required, it shall be indicated in the contract. If it is not indicated, it shall be delivered without heat treatment.

1020 seamless steel pipe has a nominal outer diameter of 88.9mm and a nominal wall thickness of 6.45mm.


1.1020 the allowable deviation of outer diameter and wall thickness of seamless steel pipe shall comply with the provisions of national standards.


Allowable deviation of outer diameter + 0.50mm ~ 0.20mm allowable deviation of wall thickness + 0.97mm ~ 0.77mm.


2. The general length of steel pipe is 9400mm ~ 9750mm.


3. Profile 3.1 the bending degree of steel pipe shall not be greater than 1.0mm/m.


The end faces at both ends of 1020 seamless steel pipe shall be perpendicular to the steel pipe axis, and the notch burr shall be removed.


4. 1020 seamless steel pipe shall be delivered according to actual weight or theoretical weight. The theoretical weight per meter of 20# seamless steel pipe is 13.115kg/m.


5. The allowable deviation of chemical composition of finished steel pipe shall comply with relevant provisions of ASTM 1020.


6. Steel pipes shall be delivered in hot rolling state.


7. Dense steel pipes shall be subject to eddy current flaw detection one by one to test the compactness of steel pipes. The diameter of artificial defect through hole of eddy current flaw detection comparison sample is φ 2.2mm±0.01mm。


China Baote steel pipe produces 1020 steel pipes. As an important part of iron and steel products, it is divided into seamless steel pipes (round billets) and welded steel pipes (plate and strip billets) due to different manufacturing processes and shapes of billets used.


Due to different manufacturing processes, seamless steel pipes in China are divided into hot rolled (extruded) seamless steel pipes and cold drawn (rolled) seamless steel pipes. Cold drawn (rolled) pipe is divided into circular pipe and special-shaped pipe.

technological process


Hot rolled (extruded) seamless steel pipe: round tube blank → heating → perforation → three roll cross rolling, continuous rolling or extrusion → pipe stripping → sizing (or reducing) → cooling → blank tube → straightening → quality inspection wall thickness → hydrostatic test (or flaw detection) → marking → warehousing.


Cold drawn (rolled) seamless steel pipe: round tube blank → heating → perforation → heading → annealing → pickling → oiling (copper plating) → multi pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → quality inspection wall thickness → hydrostatic test (flaw detection) → marking → warehousing.


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