ASTM A540

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ASTM A540

ASTM A540

ASTM A540/A540M

ASTM A540/A540M - Standard specification for Alloy Steel Bolting for Special Applications

This specification covers 5 grades of bolting with twelve classes of yield strength ranging from 50 to 120 ksi [345 to 827 Mpa] for used in high temperature service such as fasteners for pressure bessel and valve flanges. The specification is expressed in both inch-pound units and in SI units. Bolting Specialist primarily stocks and supply A453 Grade 660 Boltings for high temperature service. We stock round bar in Grade 660, Grade 651 & Grade 665 for quick manufacturing these bolts. These bolts are solution annealed and age hardened to provide maximum efficiency in their applications. We offer Rupture Test Facility for sufficient quantity order.

ASTM 540/A540M Bolting Grades and Classes

Grade B21	Class 5	Class 4	Class 3	Class 2	Class 1
Grade B22	Class 5	Class 4	Class 3	Class 2	Class 1
Grade B23	Class 5	Class 4	Class 3	Class 2	Class 1
Grade B24	Class 5	Class 4	Class 3	Class 2	Class 1
Grade B24V	--	--	Class 3	Class 2	Class 1

ASTM A540/A540M Chemical CompositionA

Element
	Grade B21	Grade B22	Grade B23	Grade B24	Grade B24V
	Cr-Mo-V	4142-H	E-4340-H	4340-Mod.	4340V-Mod.
	Chrome Moly Vanadium	Chrome Moly	Chrome Nickel Vanadium	Chrome Nickel Vanadium	Chrome Nickel Moly Vanadium
	RangeB, %
Carbon	0.35 - 0.44	0.39 - 0.46	0.37 - 0.44	0.37 - 0.44	0.37 - 0.44
Manganese	0.45 - 0.70	0.65 - 1.10	0.60 - 0.95	0.70 - 0.90	0.60 - 0.95
PhosphorusC, max	0.025	0.025	0.025	0.025	0.025
SulfurC, max	0.025	0.025	0.025	0.025	0.025
Silicon	0.15 - 0.35	0.15 - 0.35	0.15 - 0.35	0.15 - 0.35	0.15 - 0.35D
Chromium	0.80 - 1.15	0.75 - 1.20	0.65 - 0.95	0.70 - 0.95	0.60 - 0.95
Nickel	--	--	1.55 - 2.00	1.65 - 2.00	1.55 - 2.00
Molybdenum	0.50 - 0.65	0.15 - 0.25	0.20 - 0.30	0.30 - 0.40	0.40 - 0.60
Vanadium	0.25 - 0.35	---	---	---	0.04 - 0.10

A The intensional addition of Bi, Se, Te and Pb is not permitted.
B Unless otherwise specified, separate determinations may vary from the specified ranges, except that elements in any heat mush not vary both above and below the specified range.
C Phosphorus and sulfur content is 0.04% max when open hearth steel is specified.
D Silicon content is 0.35& mac if vacuum carbon deoxidized.

ASTM A540 Mechanical Properties (Imperial)

Grades	Class	Diameter, inch.	Tensile Strength, min	Yield Strength, 0.2% offset, min	Elongation min, %	Reduction of Area, min, %	Surface Brinell Hardness		Charpy V Notch +10 °F [-12.2 °C]
			Inch Pound Units				Surface Brinell Hardness
			ksi	ksi	In 2 inch.		Min	Max
Grade B21 (Cr-Mo-V)	5	to 2, incl.	120	105	15	50	241	285	D
	5	over 2 to 6, incl.	115	100	15	50	248	302	D
	5	over 6 to 8, incl.	115	100	15	50	255	311	D
	4	to 3, incl.	135	120	13	45	269	331	D
	4	over 3 to 6, incl.	135	120	13	45	277	352	D
	3	to 3, incl.	145	130	12	40	293	352	D
	3	over 3 to 6, incl.	145	130	12	40	308	375	D
	2	to 4, incl.	155	140	11	40	311	401	D
	1	to 4, incl.	165	150	10	35	321	429	D
Grade B22 (4142-H)	5	to 2, incl.	120	105	15	50	248	293	A
	5	over 2 to 4, incl.	115	100	15	50	255	302	D
	4	to 1, incl.	135	120	13	45	269	341	A
	4	over 1 to 4, incl.	135	120	13	45	277	363	D
	3	to 2, incl.	145	130	12	40	293	363	D
	3	over 2 to 4, incl.	145	130	12	40	302	375	D
	2	to 3, incl.	155	140	11	40	311	401	D
	1	to 1-1/2, incl.	165	150	10	35	321	401	D
Grade B23 (E-4340-H)	5	to 6, incl.	120	105	15	50	248	311	A
	5	over to 8, incl.	115	100	15	50	255	321	A
	5	over 8 to 9-1/2, incl.	115	100	15	50	262	321	D
	4	to 3, incl.	135	120	13	45	269	341	A
	4	over 3 to 6, incl.	135	120	13	45	277	352	A
	4	over 6 to 9-1/2, incl.	135	120	13	45	285	363	D
	3	to 3, incl.	145	130	12	40	293	363	B
	3	over 3 to 6, incl.	145	130	12	40	302	375	B
	3	over 6 to 9-1/2, incl.	145	130	12	40	311	388	D
	2	to 3, incl.	155	140	11	40	311	388	D
	2	over 3 to 6, incl.	155	140	11	40	311	401	D
	1	to 3, incl.	165	150	10	35	321	415	D
	1	over 3 to 6, incl.	165	150	10	35	331	429	D
	1	over 6 to 8, incl.	165	150	10	35	341	444	D
Grade B24 (4340 Mod.)	5	to 6, incl.	120	105	15	50	248	311	A
	5	over 6 to 8, incl.	115	100	15	50	255	321	A
	5	over 8 to 9-1/2, incl.	115	100	15	50	262	321	A
	4	to 3, incl.	135	120	13	45	269	341	A
	4	over 3 to 6, incl.	135	120	13	45	277	352	A
	4	over 6 to 8, incl.	135	120	13	45	285	363	A
	4	over 8 to 9-1/2, incl.	135	120	13	45	293	363	D
	3	to 3, incl.	145	130	12	40	293	363	B
	3	over 3 to 8, incl.	145	130	12	40	302	388	B
	3	over 8 to 9-1/2, incl.	145	130	12	40	311	388	D
	2	to 7, incl.	155	140	11	40	311	401	B
	2	over 7 to 9-1/2, incl.	155	140	11	40	321	415	D
	1	to 6, incl.	165	150	10	35	321	415	C
	1	over 6 to 8, incl.	165	150	10	35	331	429	D
Grade B24V (4340 Mod.)	3	to 4, incl.	145	130	12	40	293	363	A
	3	over 4 to 8, incl.	145	130	12	40	302	375	B
	3	over 8 to 11, incl.	145	130	12	40	311	388	C
	2	to 4, incl.	155	140	11	40	311	388	B
	2	over 4 to 8, incl.	155	140	11	40	311	401	C
	2	over 8 to 11, incl.	155	140	11	40	321	415	D
	1	to 4, incl.	165	150	10	35	321	415	C
	1	over 4 to 8, incl.	165	150	10	35	331	429	D
	1	over 8 to 11, incl.	165	150	10	35	331	444	D