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Production, Supply, Stock Range of ASTM A320 L43 (AISI 4340)
Thread Diameters : Up to 2-1/2
Threads Configuration : ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads
Certification : Dual Certified As per ASTM & ASME Codes
Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
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.
|ASTM A320 L43 Alloy steel||AISI 4340 Quenched and tempered|
ASTM A320 Grade L43 Chemical Properties
|Element||L43 (AISI 4340)|
|Carbon||0.38 – 0.43%|
|Manganese||0.75 – 1.00%|
|Silicon||0.15 – 0.35%|
|Chromium||0.70 – 0.90%|
|Nickel||1.65 – 2.00%|
|Molybdenum||0.20 – 0.30%|
ASTM A320 Grade L43 Mechanical Properties
|Grade||Size||Tensile, ksi min||Yield, ksi, min||Charpy Impact||Elong, % min||RA, %, min|
|L43||sup a 4||125||105||-150° F||16||50|
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