Grade B22 4142-H - ASTM A 540/A540M-2024

Grade	Grade B22
Other Names
Corresponding Standard	ASTM A 540/A540M-2024 Alloy-steel Bolting for Special Applications
Classification	Alloy Steel

Grade B22 Chemical Element Composition Content (%)

Component	C	Si	Mn	P ^①	S ^①	Cr	Mo
Minimum Value	0.39	0.15	0.65	-	-	0.75	0.15
Maximum Value	0.46	0.35	1.1	0.025	0.025	1.2	0.25

Grade B22 Mechanical Properties

diameter d mm	Mark	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
d≤50	Class 5	≥825	≥725	≥15	≥50	248~293	-12.2℃：①
50＜d≤100	Class 5	≥795	≥690	≥15	≥50	255~302
d≤25	Class 4	≥930	≥825	≥13	≥45	269~341	-12.2℃：①
25＜d≤100	Class 4	≥930	≥825	≥13	≥45	277~363
d≤50	Class 3	≥1000	≥895	≥12	≥40	293~363
50＜d≤100	Class 3	≥1000	≥895	≥12	≥40	302~375
d≤75	Class 2	≥1070	≥965	≥11	≥40	311~401
d≤38	Class 1	≥1140	≥1035	≥10	≥35	321~401

GradeB22 Corresponding Standards(Same grade name, different standards)

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