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321S51 520


321S51 520 material is B.S. BS 1506 Specification for carbon, low alloy and stainless steel bars and billets for bolting material to be used in pressure retaining applications Specification for carbon, low alloy and stainless steel bars and billets for bolting material to be used in pressure retaining applications.

Chemical composition of 321S51 520, 321S51 520 mechanical properties, 321S51 520 datasheet, 321S51 520 equivalent grade, Heat treatment and temperature process of 321S51 520.


321S51 520 property sheet

321S51 520 Spec.

B.S. BS 1506
Specification for carbon, low alloy and stainless steel bars and billets for bolting material to be used in pressure retaining applications

Chemical Composition of 321S51 520

C: 0.04 0.10
Si: Max 1.00
Mn: Max 2.00
P: Max 0.045
S: Max 0.025
Cr: 17.00 19.00
Mo: Max Min
Ni: 9.00 12.00
Ti: Max 0.80

Mechanical Properties of 321S51 520

Rp0.2 (MPa) 636 (≥)
Rm (MPa) 462 (≥)
AKV (J) 14
A (%) 43
Z (%) 13
Hardness HBW 342

321S51 520 shape and dimensions

321S51 520 Round bar: 1mm-800mm
321S51 520 Square bar: 10mm * 10mm-600mm *600mm
321S51 520 Flat bar: Thickness:8mm-800mm Width:10mm to 1500mm
321S51 520 Sheet or Plate: Thickness:3mm-80mm Width:1.5mm to 1500mm
321S51 520 Strip or Coil: Thickness:0.1mm-3mm Width:1.5mm-1500mm
321S51 520 Forgings: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes