817M40 - BS 970-1-1983

Grade	817M40
Corresponding Standard	BS 970-1-1983 British Standard Specification for Wrough steels for mechanical and allied engineering purposes Part 1. General inspection and testing procedures and specific requirements for carbon,carbon manganese,alloy and stainless steels
Classification	Alloy Steel

817M40 Chemical Element Composition Content (%)

	Component	C	Mn	P	S	Cr	Ni	Mo
渗氮硬化钢见表6	Minimum Value	0.36	0.45	-	-	1	1.3	0.2
渗氮硬化钢见表6	Maximum Value	0.44	0.7	0.025	0.025	1.4	1.7	0.35

	Component	C	Mn	P	S	Cr	Ni	Mo
光亮钢棒见1.7.2.1	Minimum Value	0.36	0.45	-	-	1	1.3	0.2
光亮钢棒见1.7.2.1	Maximum Value	0.44	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	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
Bright bars; 6≤d≤29	Quenching and Tempering + Turning or Grinding; Z①	≥1550	σs≥1235 Rp0.2≥1125②	≥5	≥444	lzod: ≥8 ft.lb KCV: ≥9J
Bright bars; 6≤d≤29	Quenching and Tempering + Turning or Grinding; X①	1150~1300	σs≥1020 Rp0.2≥1005②	≥10	341~401	lzod: ≥25 ft.lb KCV: ≥28J
Bright bars; 6≤d≤29	Quenching and Tempering + Turning or Grinding; W①	1075~1225	σs≥940 Rp0.2≥925②	≥11	311~375	lzod: ≥30 ft.lb KCV: ≥35J
Bright bar; 13＜d≤63	Quenching and Tempering + Turning or Grinding; V	1000~1150	σs≥850 Rp0.2≥835②	≥12	293~352	lzod: ≥35 ft.lb KCV: ≥42J
Bright bar; 29<d≤100	Quenching and Tempering + Turning or Grinding; U	925~1075	σs≥755 Rp0.2≥740②	≥12	269~331	lzod: ≥35 ft.lb KCV: ≥42J
Bright bars; 63＜d≤150	Quenching and tempering + turning or grinding; T	850~1000	σs≥680 Rp0.2≥665②	≥13	248~302	lzod: ≥40 ft.lb KCV: ≥50J
Bright bars; 150＜d≤250	Quenching and tempering + turning or grinding; T	850~1000	σs≥650 Rp0.2≥635②	≥13	248~302	lzod: ≥30 ft.lb KCV: ≥35J
Bright bars; 6≤d≤29	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding; Z①	≥1550④	σs≥1250 Rp0.2≥1235②	≥3	≥444③	lzod: ≥8 ft.lb
Bright bars; 6≤d≤29	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding; X①	1150~1300④	σs≥1035 Rp0.2≥1020②	≥7	341~401③	lzod: ≥25 ft.lb
Bright bars; 6≤d≤29	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding; W①	1075~1225④	σs≥955 Rp0.2≥940②	≥8	311~375③	lzod: ≥30 ft.lb
Bright bar; 13＜d≤63	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding; V	1000~1150	σs≥865 Rp0.2≥850②	≥9	293~352③	lzod: ≥35 ft.lb
Bright bar; 29<d≤100	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding; U	925~1075	σs≥770 Rp0.2≥755②	≥9	269~331③	lzod: ≥35 ft.lb
Bright bars; 63＜d≤150	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding; T	850~1000	σs≥700 Rp0.2≥680②	≥9	248~302③	lzod: ≥40 ft.lb
Bright Bar	Turning, grinding, or cold drawing and softening				≤277
Nitriding steel; LRS 29	Z①	≥1550	σs≥1235 Rp0.2≥1125②	≥5	≥444	lzod: ≥8 ft.lb KCV: ≥9J
Nitriding steel; LRS 29	Y①	1225~1375	σs≥1095 Rp0.2≥1080②	≥10	363~429	lzod: ≥18 ft.lb KCV: ≥21J
Nitriding steel; LRS 29	X①	1150~1300	σs≥1020 Rp0.2≥1005②	≥10	341~401	lzod: ≥25ft.lb KCV: ≥28J
Nitriding steel; LRS 29	W①	1075~1225	σs≥940 Rp0.2≥925②	≥11	311~375	lzod: ≥30ft.lb KCV: ≥35J
Nitrided Steel; LRS 63	V	1000~1150	σs≥850 Rp0.2≥835②	≥12	293~352	lzod: ≥35 ft.lb KCV: ≥42J
Nitrided Steel; LRS 100	U	925~1075	σs≥755 Rp0.2≥740②	≥12	269~331	lzod: ≥35 ft.lb KCV: ≥42J
Nitrided Steel; LRS 150	T	850~1000	σs≥680 Rp0.2≥665②	≥13	248~302	lzod: ≥40 ft.lb KCV: ≥50J
Nitrided Steel; LRS 250	T	850~1000	σs≥650 Rp0.2≥635②	≥13	248~302	lzod: ≥30 ft.lb KCV: ≥35J

• Re-yield strength；Rp0.2-Stress at 0.2% proof plastic elongation (0.2% proof strength).
• Not specified, σs in the table refers to Re
• ft.lb=1.3558J

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

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