High quality special steel supplier.Old rev.

  • Certified Company

    DNV&ABS

  • Certified Company

    ISO 9001:2008

  • R&D Production

    In China
Get a Quote

GBT 40B

40B


40B material is China structural steel and alloy steel.

Chemical composition of 40B, 40B mechanical properties, 40B datasheet, 40B equivalent grade, Heat treatment and temperature process of 40B.


40B property sheet

40B Spec.

Related Materials

A 276 S44003
A 314 S44003
A 473 S44003
A 580 S44003
S44003
SUS 440B
STS440B
440B
ASTM440B
AISI440B

Chemical Composition of 40B

C 0.37-0.44
Si 0.17-0.37
Mn 0.60-0.90
B 0.0005-0.0035

Mechanical Properties of 40B

Rp0.2 (MPa) 688 (≥)
Rm (MPa) 879 (≥)
AKV (J) 32
A (%) 21
Z (%) 32
Hardness HBW 222

40B shape and dimensions

40B Round bar: 1mm-800mm
40B Square bar: 10mm * 10mm-600mm *600mm
40B Flat bar: Thickness:8mm-800mm Width:10mm to 1500mm
40B Sheet or Plate: Thickness:3mm-80mm Width:1.5mm to 1500mm
40B Strip or Coil: Thickness:0.1mm-3mm Width:1.5mm-1500mm
40B Forgings: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes

Our Materials

Why Our Service?

Let’s Start Work
Together

Get a Quote

Quick Contact

©Longhai Special Steel 2025