826M40 - BS 970-1-1983

Grade	826M40
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

826M40 Chemical Element Composition Content (%)

	Component	C	Si	Mn	P	S	Cr	Ni	Mo
光亮棒见1.7.2.2	Minimum Value	0.36	0.1	0.45	-	0.025	0.5	2.3	0.45
光亮棒见1.7.2.2	Maximum Value	0.44	0.35	0.7	0.035	0.05	0.8	2.8	0.65

	Component	C	Si	Mn	P ^*	S ^*	Cr	Ni	Mo
渗氮钢见表6	Minimum Value	0.36	0.1	0.45	-	-	0.5	2.3	0.45
渗氮钢见表6	Maximum Value	0.44	0.35	0.7	0.025	0.025	0.8	2.8	0.65

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

826M40 Mechanical Properties

diameter or across flats d mm	Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
Bright bars; 150＜d≤250	Quenched and Tempered + Turning or Grinding U	925~1075	Re: ≥740 Rp0.2: ≥725	≥12		269~331	Izod: ≥25ft.lb KCV: ≥28
Bright rod; 100＜d≤150	Quenched and Tempered + Turning or Grinding U	925~1075	Re: ≥755 Rp0.2: ≥740	≥12		269~331	Izod: ≥35ft.lb KCV: ≥42
Bright bars; 63＜d≤250	Quenching and Tempering + Turning or Grinding V	1000~1150	Re: ≥835 Rp0.2: ≥820	≥12		293~352	Izod: ≥25ft.lb KCV: ≥28
Bright bars; 63＜d≤150	Quenching and Tempering + Turning or Grinding V	1000~1150	Re: ≥850 Rp0.2: ≥835	≥12		293~352	Izod: ≥35ft.lb KCV: ≥42
Bright bars; 29＜d≤250	Quenching and tempering + turning or grinding W℗	1075~1225	Re: ≥925 Rp0.2: ≥910	≥11		311~375	Izod: ≥20ft.lb KCV: ≥22
Bright bars; 29＜d≤150	Quenching and tempering + turning or grinding W℗	1075~1225	Re: ≥940 Rp0.2: ≥925	≥11		311~375	Izod: ≥30ft.lb KCV: ≥35
Bright bars; 29＜d≤150	Quenching and Tempering + Turning or Grinding X℗	1150~1300	Re: ≥1020 Rp0.2: ≥1005	≥10		341~401	Izod: ≥25ft.lb KCV: ≥28
Bright bars; 29＜d≤150	Quenching and Tempering + Turning or Grinding Y℗	1225~1375	Re: ≥1095 Rp0.2: ≥1080	≥10		363~429	Izod: ≥25ft.lb KCV: ≥28
Bright bar; 29<d≤100	Quenching and Tempering + Turning or Grinding Z℗	≥1550	Re: ≥1235 Rp0.2: ≥1125	≥7		≥444	Izod: ≥10ft.lb KCV: ≥11
Bright rod; 100＜d≤150	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding U	925~1075	Re: ≥770 Rp0.2: ≥755	≥9		© 269~331	Izod: ≥35ft.lb
Bright bars; 63＜d≤150	Quenching and tempering + cold drawing or Quenching and tempering + cold drawing + grinding V	1000~1150	Re: ≥865 Rp0.2: ≥850	≥9		© 293~352	Izod: ≥35ft.lb
Bright bars; 29＜d≤150	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding W℗	1075~1225◎	Re: ≥955 Rp0.2: ≥940	≥8		© 311~375	Izod: ≥30ft.lb
Bright bars; 29＜d≤150	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding X℗	1150~1300◎	Re: ≥1035 Rp0.2: ≥1020	≥7		© 341~401	Izod: ≥25ft.lb
Bright bars; 29＜d≤150	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding Y℗	1225~1375◎	Re: ≥1010 Rp0.2: ≥1095	≥7		© 363~429	Izod: ≥25ft.lb
Bright bar; 29<d≤100	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding Z℗	≥1550◎	Re: ≥1250 Rp0.2: ≥1235	≥5		© ≥444	Izod: ≥10ft.lb
Bright Bar	Turning, Grinding or Cold Drawing and Softening					≤277
Nitrided steel; d≤250	U	925~1075	Re: ≥740 Rp0.2: ≥725		≥12	269~331	Izod:≥25ft.lb KCV:≥28
Nitrided steel; d≤150	U	925~1075	Re: ≥755 Rp0.2: ≥740		≥12	269~331	Izod:≥35ft.lb KCV:≥42
Nitrided steel; d≤250	V	1000~1150	Re: ≥835 Rp0.2: ≥820		≥12	293~352	Izod:≥25ft.lb KCV:≥28
Nitrided steel; d≤150	V	1000~1150	Re: ≥850 Rp0.2: ≥835		≥12	293~352	Izod:≥35ft.lb KCV:≥42
Nitrided steel; d≤250	W℗	1075~1225	Re: ≥925 Rp0.2: ≥910		≥11	311~375	Izod:≥20ft.lb KCV:≥22
Nitrided steel; d≤150	W℗	1075~1225	Re: ≥940 Rp0.2: ≥925		≥11	311~375	Izod:≥30ft.lb KCV:≥35
Nitrided steel; d≤150	X℗	1150~1300	Re: ≥1020 Rp0.2: ≥1005		≥10	341~401	Izod:≥25ft.lb KCV:≥28
Nitrided steel; d≤150	Y℗	1225~1375	Re: ≥1095 Rp0.2: ≥1080		≥10	363~429	Izod:≥25ft.lb KCV:≥28
Nitriding steel; d≤100	Z℗	≥1550	Re: ≥1235 Rp0.2: ≥1125		≥7	≥444	Izod:≥10ft.lb KCV:≥11

• 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

Approximate Comparison Table Structural Alloy Steel

China	United Kingdom
GB	BS EN/BS
40CrNi3Mo	826M40

826M40 Corresponding Standards(Same grade name, different standards)

1	BS 970-3-1991
	826M40
2	BS 970-1-1983
	826M40

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