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ASTM A320 Standard (May 12, 2010)
ASTM A320,Standard,ASTM A320 specification,alloy steel,stainless steel ,bolting materials,fastener,grades of ASTM A320,AISI,carbide solution treated, strain hardened,Size,Grade, Nuts,wshers,A194 Grade 4 or 7
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, | Charpy Impact | Elong, | RA, %, min |
L7 | Up to 21/2 | 125 | 105 | -150° F | 16 | 50 |
L43 | Up to 4 | 125 | 105 | -150° F | 16 | 50 |
B8 | All | 75 | 30 | N/A | 30 | 50 |
B | All | 75 | 30 | N/A | 30 | 50 |
B8 | 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 | |
B | 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 |
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