817M40 - BS 970-3-1991

Grade	817M40
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

817M40 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo
Minimum Value	0.36	0.1	0.45	-	-	1	1.3	0.2
Maximum Value	0.44	0.4	0.7	0.035	0.04	1.4	1.7	0.35

• For older grades of stainless steel, see Table 2 of standard BS 970-4-1970

817M40 Mechanical Properties

condition	Mark	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Hardness HBW	Impact Energy Absorption KV2 J
150＜d≤250	817M40T	Quenching and Tempering + Turning or Grinding	850~1000	≥650	≥13	248~302	Izod:≥40 KCV:≥35
63＜d≤150	817M40T	Quenching and Tempering + Turning or Grinding	850~1000	≥680	≥13	248~302	Izod:≥54 KCV:≥50
29＜d≤100	817M40U	Quenching and Tempering + Turning or Grinding	925~1075	≥755	≥12	269~331	Izod:≥47 KCV:≥42
13＜d≤63	817M40V	Quenching and Tempering + Turning or Grinding	1000~1150	≥850	≥12	293~352	Izod:≥47 KCV:≥42
6≤d≤29	817M40W	Quenching and Tempering + Turning or Grinding ①	1075~1225	≥940	≥11	311~375	Izod:≥40 KCV:≥35
6≤d≤29	817M40X	Quenching and tempering + turning or grinding①④	1150~1300	≥1020	≥10	341~401	Izod:≥34 KCV:≥28
6≤d≤29	817M40Z	Quenching and tempering + turning or grinding①④	≥1550	≥1235	≥5	≥444	Izod:≥10 KCV:≥9
63＜d≤150	817M40T	Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding	850~1000	≥700	≥9	248~302	Izod:≥54
29＜d≤100	817M40U	Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding	925~1075	≥770	≥9	269~331	Izod:≥47
13＜d≤63	817M40V	Quenching + Tempering + Cold Drawing or Quenching + Tempering + Cold Drawing + Grinding	1000~1150	≥865	≥9	293~352	Izod:≥47
6≤d≤29	817M40W	Quenching and tempering + cold drawing or quenching and tempering + cold drawing + grinding ①②③	1075~1225	≥955	≥8	311~375	Izod:≥40
6≤d≤29	817M40X	Quenching and tempering + cold drawing or quenching and tempering + cold drawing + grinding ①②③	1150~1300	≥1035	≥7	341~401	Izod:≥34
6≤d≤29	817M40Z	Quenching and tempering + cold drawing or quenching and tempering + cold drawing + grinding ①②③	≥1550	≥1250	≥3	≥444	Izod:≥11
Rod		Turning, Grinding or Cold Drawing and Softening				≤277

1 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
34CrNi3Mo 34CrNiMo ZG34CrNiMo	SNCM447	4340	36CrNiMo6	34CrNiMo6 GS-34CrNiMo6V	35NCD6	34CrNiMo6	1.6582	36KH2N2MFA 38KH2N2MA 40KHN2MA	2541	817M40

2 Approximate Comparison Table Cast 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
ZG34CrNiMo 34CrNi3Mo 34CrNiMo	SNCM447	4340	36CrNiMo6	GS-34CrNiMo6V 34CrNiMo6	35NCD6	34CrNiMo6	1.6582	36KH2N2MFA 38KH2N2MA 40KHN2MA	2541	817M40

3 Approximate Comparison Table Structural Alloy Steel

Japan	United States	Germany	France	European Standard		Russia	Sweden	United Kingdom
JIS	ASTM/AISI	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
SNCM447	4340	34CrNiMo6	35NCD6	34CrNiMo6	1.6582	36Х2Н2МФА 36KH2N2MFA	2541	817M40

4 Approximate Comparison Table Structural Alloy Steel

Japan	South Korea	United States	Germany		France	European Standard		Russia	Sweden	United Kingdom
JIS	KS	ASTM/AISI	DIN EN/DIN	W-Nr.	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
SNCM447	SNCM447	4330 4337 4340 G43376 G43400 G43499	34CrNiMo6 35CrNiMo6 GS-34CrNiMo6	1.6582	34CrNiMo6 34CrNiMo8 35CND6	34CrNiMo6 35CrNiMo6KD	1.6582	38Х2Н2МА	2541	34CrNiMo6 816M40 817M40

5 Approximate Comparison Table Structural Alloy Steel

China	United Kingdom
GB	BS EN/BS
40CrNiMo	817M40

817M40 Corresponding Standards(Same grade name, different standards)

1	BS 970-3-1991
	817M40
2	BS 970-1-1983
	817M40

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!