Grade B23 E-4340-H - ASTM A 540/A540M-2024

Grade	Grade B23
Other Names
Corresponding Standard	ASTM A540/A540M-2024 Alloy-steel Bolting for Special Applications
Classification	Alloy Steel

Grade B23 Chemical Element Composition Content (%)

Component	C	Si	Mn	P ^①	S ^①	Cr	Ni	Mo
Minimum Value	0.37	0.15	0.6	-	-	0.65	1.55	0.2
Maximum Value	0.44	0.35	0.95	0.025	0.025	0.95	2	0.3

Grade B23 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≤150	Class 5	≥825	≥725	≥15	≥50	248~311	-12.2℃：①
150＜d≤200	Class 5	≥795	≥690	≥15	≥50	255~321	-12.2℃：①
200＜d≤240	Class 5	≥795	≥690	≥15	≥50	262~321
d≤75	Class 4	≥930	≥825	≥13	≥45	269~341	-12.2℃：①
75＜d≤150	Class 4	≥930	≥825	≥13	≥45	277~352	-12.2℃：①
150＜d≤240	Class 4	≥930	≥825	≥13	≥45	285~363
d≤75	Class 3	≥1000	≥895	≥12	≥40	293~363	-12.2℃：②
75＜d≤150	Class 3	≥1000	≥895	≥12	≥40	302~375	-12.2℃：②
150＜d≤240	Class 3	≥1000	≥895	≥12	≥40	311~388
d≤75	Class 2	≥1070	≥965	≥11	≥40	311~388
75＜d≤150	Class 2	≥1070	≥965	≥11	≥40	311~401
150＜d≤240	Class 2	≥1070	≥965	≥11	≥40	321~415
d≤75	Class 1	≥1140	≥1035	≥10	≥35	321~415
75＜d≤150	Class 1	≥1140	≥1035	≥10	≥35	331~429
150＜d≤200	Class 1	≥1140	≥1035	≥10	≥35	341~444

GradeB23 Corresponding Standards(Same grade name, different standards)

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