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ASTM A240

ASTM A240 Specification for Stainless Steel Plates, Sheets and Strips used as parent material for manufacturing Flat Washers.

ASTM A240 specification covers stainless steel plates, sheets and strips for pressure vessels and general applications. This specification covers chemical composition and mechanical properties for various grades of ferritic, austenitic, martensitic, duplex, super duplex and high moly stainless steel alloys. Boltport frequently uses sheets and plates of 304, 304l, 316, 316l, 321, 347, 309, 310, 316Ti, 317L, Xm-19, 904L, 409, 410, 430, Duplex S31803, S32205, Super Duplex S32750, S32760, S32550, High moly UNS S31254, Alloy 20, etc., conforming to ASTM A240 specification for manufacturing sheet metal washers for bolting assemblies.

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Parameter Description

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Type

Tensile Strength, ksi,
min

Yield Strength, ksi,
min

Elongation, %
min

Hardness,
maxA

304

75

30

40

201 HBW or 92 HRB

316

75

30

40

217 HBW or 95 HRB

321

75

30

40

217 HBW or 95 HRB

410

65

30

20

217 HBW or 96 HRB

904L

71

31

35

95 HRB

UNS S31803

90

65

25

293 HBW or 31 HRC

UNS S32750

116

80

15

310 HBW or 32 HRC

UNS S31254

100

45

35

223 HBW or 96 HRB

Element

304

316

321

410

904L

S31803

S32750

S31254

Carbon

0.07

0.08

0.08

0.08 - 0.15

0.02

0.03

0.03

0.02

Manganese, max

2.00

2.00

2.00

1.00

2.00

2.00

1.20

1.00

Phosphorus, max

0.045

0.045

0.045

0.040

0.045

0.030

0.035

0.030

Sulfur, max

0.030

0.030

0.030

0.030

0.035

0.020

0.020

0.010

Silicon

0.75

0.75

0.75

1.00

1.00

1.00

0.80

0.80

Chromium

17.50 - 19.50

16.00 - 18.00

17.00 - 19.00

11.50 - 13.50

19.00 - 23.00

21.00 - 23.00

24.00 - 26.00

19.50 - 20.50

Nickel

8.00 - 10.50

10.00 - 14.00

9.00 - 12.00

0.75

23.00 - 28.00

4.50 - 6.50

6.00 - 8.00

17.50 - 18.50

Molybdenum

...

2.00 - 3.00

...

...

4.00 - 5.00

2.50 - 3.50

3.00 - 5.00

6.00 - 6.50

Nitrogen

0.10 max

0.10 max

0.10 max

...

0.10 max

0.08 - 0.20

0.24 - 0.32

0.18 - 0.25

Copper, max

...

...

...

...

1.00 - 2.00

...

0.50

0.50 - 1.00

Titanium

...

...

5 x (C+N) - 0.70

...

...

...

...

...