722M24 - BS 970-1-1983

Grade	722M24
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

722M24 Chemical Element Composition Content (%)

Component	C	Mn	P	S	Cr	Ni	Mo
Minimum Value	0.2	0.45	-	0.025	3	-	0.45
Maximum Value	0.28	0.7	0.035	0.05	3.5	0.4	0.65

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

722M24 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 %	Hardness HBW	Impact Energy Absorption KV2 J
Bright Bars; 6≤d≤250	Quenched and Tempered + Turning or Grinding T	850~1000	Re: ≥650 Rp0.2: ≥635	≥13	248~302	Izod: ≥30ft.lb KCV: ≥35
Bright bars; 6≤d≤150	Quenched and Tempered + Turning or Grinding T	850~1000	Re: ≥680 Rp0.2: ≥665	≥13	248~302	Izod: ≥40ft.lb KCV: ≥50
Bright bars; 6≤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; 6≤d≤150	Quenching and Tempering + Cold Drawing or Quenching and Tempering + Cold Drawing + Grinding T	850~1000	Re: ≥700 Rp0.2: ≥680	≥9	© 248~302	Izod: ≥40ft.lb
Bright bars; 6≤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;	Turning, Grinding or Cold Drawing and Softening				≤269

• 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 Nitriding steels

International Organization for Standardization	Germany	France	European Standard		United Kingdom
ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	BS EN/BS
31CrMo12	31CrMo12	30CD12	31CrMo12	1.8515	722M24

722M24 Corresponding Standards(Same grade name, different standards)

1	BS 970-3-1991
	722M24
2	BS 970-1-1983
	722M24

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