Grade B23 E-4340-H - ASTM A540/540M-2015

Grade	Grade B23
Other Names
Corresponding Standard	ASTM A540/540M-2015 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

	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
Class 5, d≤150	≥825	≥725	≥15	≥50	248~311	-12.2°C ≥47
Class 5, 150＜d≤200	≥795	≥690	≥15	≥50	255~321	≥47
Class 5, 200＜d≤240	≥795	≥690	≥15	≥50	262~321	-
Class 4, d≤75	≥930	≥825	≥13	≥45	269~341	≥47
Class 4, 75＜d≤150	≥930	≥825	≥13	≥45	277~352	≥47
Class 4, 150＜d≤240	≥930	≥825	≥13	≥45	285~363	-
Class 3, d≤75	≥1000	≥895	≥12	≥40	293~363	≥41
Class 3, 75＜d≤150	≥1000	≥895	≥12	≥40	302~375	≥41
Class 3, 150＜d≤240	≥1000	≥895	≥12	≥40	311~388	-
Class 2, d≤75	≥1070	≥965	≥11	≥40	311~388	-
Class 2, 75＜d≤150	≥1070	≥965	≥11	≥40	311~401	-
Class 2, 150＜d≤240	≥1070	≥965	≥11	≥40	321~415	-
Class 1, d≤75	≥1140	≥1035	≥10	≥35	321~415	-
Class 1, 75＜d≤150	≥1140	≥1035	≥10	≥35	331~429	-
Class 1, 150＜d≤200	≥1140	≥1035	≥10	≥35	341~444	-

GradeB23 Corresponding Standards(Same grade name, different standards)

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