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Grade 708M40
Corresponding Standard BS 970-3-1991
Specification for wrought steel for machanical and allied engineering purposes part 3:bright bars for general engineering purposes
Classification Alloy Steel
708M40 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Mo
Minimum Value 0.36 0.1 0.7 - - 0.9 0.15
Maximum Value 0.44 0.4 1 0.035 0.04 1.2 0.25
• For older grades of stainless steel, see Table 2 of standard BS 970-4-1970
708M40 Mechanical Properties
condition Mark
Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
150＜d≤250 708M40R Quenching and Tempering + Turning or Grinding 700~850 ≥495 ≥15 201~255 Izod:≥34
KCV:≥28
63＜d≤150 708M40R Quenching and Tempering + Turning or Grinding 700~850 ≥525 ≥17 201~255 Izod:≥54
KCV:≥50
29＜d≤100 708M40S Quenching and Tempering + Turning or Grinding 775~925 ≥585 ≥15 223~277 Izod:≥54
KCV:≥50
6≤d≤63 708M40T Quenching and Tempering + Turning or Grinding 850~1000 ≥680 ≥13 248~302 Izod:≥54
KCV:≥50
6≤d≤29 708M40U Quenching and Tempering + Turning or Grinding 925~1075 ≥755 ≥12 269~331 Izod:≥47
KCV:≥42
6≤d≤19 708M40V Quenching and Tempering + Turning or Grinding 1000~1150 ≥850 ≥12 293~352 Izod:≥47
KCV:≥42
6≤d≤13 708M40W Quenching and Tempering + Turning or Grinding 1075~1225 ≥940 ≥12 311~375 Izod:≥40
KCV:≥35
63＜d≤150 708M40R Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding 700~850 ≥540 ≥12 201~255 Izod:≥54
29＜d≤100 708M40S Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding 775~925 ≥600 ≥11 223~277 Izod:≥54
6≤d≤63 708M40T Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding 850~1000 ≥700 ≥9 248~302 Izod:≥54
6≤d≤29 708M40U Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding 925~1075 ≥770 ≥9 269~331 Izod:≥47
6≤d≤19 708M40V Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding 1000~1150 ≥865 ≥9 293~352 Izod:≥47
6≤d≤13 708M40W Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding 1075~1225 ≥955 ≥8 311~375 Izod:≥40
Rod Turning, Grinding or Cold Drawing and Softening ≤248
1 Approximate Comparison Table Structural Alloy Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France European Standard Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade SS14 BS EN/BS
42CrMo A30422 SCM440 SCM440
SCM440H 		SCM440 4140
4142 		G41400
G41420 		42CrMo4 42CrMo4 1.7225 42CD4 42CrMo4 1.7225 2244 708M40
2 Approximate Comparison Table Structural Alloy Steel
China Japan United States International Organization for Standardization Germany European Standard United Kingdom
GB JIS ASTM ISO W-Nr. L-Nr. EN Numerical Grade BS EN/BS
50CrMo SCM445 4150 50CrMo4 50CrMo4 1.7228 50CrMo4 1.7228 708M40
708M50
3 Approximate Comparison Table Structural Alloy Steel
China Japan United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
GB JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS BS EN/BS
42CrMo SCM440H 4140
4142 		42CrMo4 42CrMo4 42CD4 42CrMo4 1.7225 35KHM
38KHM 		2244 708M40
CFS11
4 Approximate Comparison Table Structural Alloy Steel
Japan United States Germany France European Standard Russia United Kingdom
JIS ASTM/AISI UNS DIN EN/DIN W-Nr. NF EN/NF EN GOST BS EN/BS
SCM440 4140
4142
6135 		G41400 41CrMo4 1.7223 42CD4TS 41CrMo 40ХФА
40KHFA 		3111-5/1
42CrMo4
708M40
708M40 Corresponding Standards(Same grade name, different standards)
1 BS 970-3-1991
708M40
2 BS 970-1-1983
708M40

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