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ASTM A320

Scope

Originally approved in 1948, the ASTM A320 specification covers alloy steel and stainless steel bolting materials for low temperature service. This standard covers rolled, forged, or strain hardened bars, bolts, screws, studs, and stud bolts used for pressure vessels, valves, flanges, and fittings. Like the ASTM A193 specification, unless otherwise specified, the 8UN thread series is specified on fastener larger than 1” in diameter.

Below is a basic summary of a few of the common grades within the ASTM A320 specification. A number of other less common grades of ASTM A320 exist, but not covered in the description below.

Grades

  • L7 Alloy steel, AISI 4140/4142 Quenched and tempered
  • L43 Alloy steel, AISI 4340 Quenched and tempered
  • B8 Class 1 Stainless steel, AISI 304, carbide solution treated
  • B8M Class 1 Stainless steel, AISI 316, carbide solution treated
  • B8 Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened
  • B8M Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened

Mechanical Properties

Grade

     Size       

Tensile,

ksi, min   

Yield,
ksi, min

Charpy Impact
20-ft-lbf
@ temp

Elong,
%, min

RA, %, min

L7

Up to 21/2

125

105

-150° F

16

50

L43

Up to 4

125

105

-150° F

16

50

B8
Class 1

All

75

30

N/A

30

50

B8M
Class 1

All

75

30

N/A

30

50

B8
Class 2

Up to 3/4

125

100

N/A

12

35

7/8 - 1

115

80

N/A

15

35

11/8 - 11/4

105

65

N/A

20

35

13/8 - 11/2

100

50

N/A

28

45

B8M
Class 2

Up to 3/4

110

95

N/A

15

45

7/8 - 1

100

80

N/A

20

45

11/8 - 11/4

95

65

N/A

25

45

13/8 - 11/2

90

50

N/A

30

45

Recommended Nuts and Washers

Grade

Nuts

Washers

L7

A194 Grade 4 or 7

F436

L43

A194 Grade 4 or 7

F436

B8 Class 1

A194 Grade 8

SS304

B8M Class 1

A194 Grade 8M

SS316

B8 Class 2

A194 Grade 8, strain hardened

SS304

B8M Class 2

A194 Grade 8M, strain hardened

SS316


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