ASTM A537 Heat-Treated Plates

December 12, 2019

ASTM A537/ A537, is the standard specification covers heat-treated carbon-manganese-silicon steel plates. Carbon steel plates made in accordance with ASTM A537 are primarily intended for fusion welded pressure vessels and structures.

ASTM A537 Class 1 plates.

Steel plates under this specification are available in three classes classified according to the different heat treatment: Class 1 (normalized), Class 2 (quenched and tempered) and Class 3 (quenched and tempered). The maximum thickness of plates furnished under this specification is 4 in. [100mm] for Class 1 and 6 in. [150mm] for Class 2 and Class 3.

Chemical Composition Requirements

ASTM A537 Heat-Treated Plates
Element		Composition
C	max	0.24
Mn	*H.A. t≤1-1/2"	0.70-1.35
	*P.A. t≤1-1/2"	0.64-1.46
	*H.A. t>1-1/2"	1.00-1.60
	*P.A. t>1-1/2"	0.92-1.72
P	max	0.025
S	max	0.025
Si	*H.A.	0.15–0.50
Si	*P.A.	0.13–0.55
Cu	*H.A. max	0.35
Cu	*P.A. max	0.38
Ni	*H.A. max	0.25
Ni	*P.A. max	0.28
Cr	*H.A. max	0.25
Cr	*P.A. max	0.29
Mo	*H.A. max	0.08
Mo	*P.A. max	0.09

*t: plate thickness; *H.A.: heat analysis; *P.A.: product analysis; unit: %.
*CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15.

Mechanical Properties

ASTM A537		Class 1	Class 2	Class 3
*T.S. ksi [MPa]	t≤2-1/2"	70-90 [485-620]	80-100 [550-690]	80-100 [550-690]
	2-1/2"＜t≤4"	65-85 [450-585]	75-95 [515-655]	75-95 [515-655]
	4"＜t≤6"	A	70-90 [485-620]	70-90 [485-620]
*Y.S. ksi [MPa]	t≤2-1/2"	≥50 [≥345]	≥60 [≥415]	≥55 [≥380]
	2-1/2"＜t≤4"	≥45 [≥310]	≥55 [≥380]	≥50 [≥345]
	4"＜t≤6"	A	≥46 [≥315]	≥40 [≥275]
*EL. 2" min. %	2"	-	-	-
	4"≤t＜2"	22	22	22
	t＞4"	A	20	20
*EL. 8" min. %	[200mm]	18	C	C

*T.S.: tensile strength; *Y.S.: yield strength; *EL. 8″: elongation in 8″; *EL. 2″: elongation in 2″; *A: Product is not available in this size range; *C: There is no requirement for elongation in 8 in.

Manufacture, Heat Treatment & Testing

The ASTM A537 steel shall be killed and conform to the fine austenitic grain size requirement of specification ASTM A20/ A20M. The ASTM A537 heat-treated plates Class 1 shall be normalized. Class 2 and Class 3 plates shall be quenched and tempered. The tempering temperature for Class 2 plates shall not be less than 1100°F [595°C] and not less than 1150°F [620°C] for Class 3 plates.

The inspection and testing required for ASTM A537 steel plates include: chemical analysis, tension test, Charpy V-Notch impact test, drop weight test, high-temperature tension test, ultrasonic examination, as well as magnetic particle examination.

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