ASTM A320 - Studbolt and nut ASTM A193 B7,B7M,B16,B8,B8M,A453 660,A182 F55,A182 F51,ASTM A453 660 , A 347 B4B , X12CR13 , AISI 904L , ASTM A182 F44 , INCONEL 718 UNS N07718 , NITRONIC UNS 20219 XM-19 , INCOLOY alloy 925 (UNS N09925)

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ASTM A320

ASTM


MATERIALS-STUDBOLTS ASTM A320

ASTM A320 specification covers alloy steel bolting materials for pressure vessels, valves, flanges, and fittings for low-temperature service. Each alloy shall conform to the prescribed chemical composition requirements. The material, as represented by the tension specimens, shall conform to the requirements as to tensile properties such as tensile strength, yield strength, elongation, and hardness. The material shall meet the prescribed impact energy absorption requirements and the recommended test temperature. According to ASTM A320 mechanical tests shall be conducted on the material, namely: impact testing, tension testing, and hardness testing.
Inside ASTM A320 several grades are covered, including both ferritic and austenitic steels designated L7, B8, etc. Selection will depend on design, service conditions, mechanical properties, and low-temperature characteristics
The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. Like the ASTM A193 specification, unless otherwise specified, the 8UN thread series is specified on fastener larger than 1 " in diameter.


Low temperature  
service

ASTM A320 L7 Alloy steel, AISI 4140/4142 Quenched and tempered
ASTM  A320 L7M
ASTM A320 L43
Alloy steel, AISI 4340 Quenched and tempered
ASTM A320 B8
Class 1 Stainless steel, AISI 304, carbide solution treated
ASTM A320 B8A
ASTM A320 B8T
ASTM A320 B8TA
ASTM A320 B8C
ASTM A320 B8M
Class 1 Stainless steel, AISI 316, carbide solution treated
ASTM A320 B8MA
ASTM A320 B8cl2
Stainless steel, AISI 304, carbide solution treated, strain hardened
ASTM A320 B8Mcl2
Stainless steel, AISI 316, carbide solution treated, strain hardened

 
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