40cr alloy steel pipe | 40cr alloy steel pipe knowledge | 40cr alloy steel pipe manufacturers

40cr alloy steel pipe | 40cr alloy steel pipe knowledge | 40cr alloy steel pipe factory 40Cr alloy steel pipe ()
Chemical composition and mechanical properties: Ingredient: carbon 0.37 to 0.45%, silicon 0.17 to 0.37%, manganese 0.5 to 0.8, chromium 0.8 to 1.1%
Annealed hardness: less than 207HBS
Normalizing hardness: less than 250HBS
Conditioning treatment: sample diameter: 25mm, 850 degree quenched heat oil quenched, 520 degrees tempered: Tensile 1000 MPa, yield 800 MPa, extension 9%, section shrinkage 45%, impact toughness 588.3 kJ/sq. Meter.
Because of its different manufacturing processes, it is divided into hot-rolled (extrusion) seamless steel tubes and cold drawn (rolled) seamless steel tubes. Cold drawn (rolled) tube is divided into two kinds of round tube and shaped tube.
a. Process Overview Hot-Rolled (Extruded Seamless Steel Tube): Round Billet → Heating → Perforated → Three-Roll Rolling, Continuous Rolling or Extrusion → Stripping → Sizing (or Reducing) → Cooling → Blanking Tube → Straightening → Hydrostatic test (or flaw detection) → mark → storage.
Cold drawn (rolled) seamless steel tube: round tube blank → heating → piercing → start → annealing → pickling → oil coating (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → Hydrostatic test (flaw detection) → mark → storage.
Alloy steel tubes: a. Low alloy steel (total alloy element content ≤ 5%) b. Medium alloy steel (total alloy element content > 5~10%) c. High alloy steel (total alloy element content >10%
Alloy steel pipe size and allowable deviation Alloy steel pipe weight calculation formula: [(outer diameter - wall thickness) * wall thickness] * 0.02466 = kg / meter (weight per meter)
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