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Production, Supply, Stock Range of ASTM A320 L7 (AISI 4140 / 4142)
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 L7 Alloy steel||AISI 4140/4142 Quenched and tempered|
ASTM A320 Grade L7 Chemical Properties
|Element||L7 (AISI 4140)|
|Carbon||0.37 – 0.49%|
|Manganese||0.65 – 1.10%|
|Silicon||0.15 – 0.35%|
|Chromium||0.75 – 1.20%|
|Molybdenum||0.15 – 0.25%|
ASTM A320 Grade L7 Mechanical Properties
|Grade||Size||Tensile, ksi min||Yield, ksi, min||Charpy Impact||Elong, % min||RA, %, min|
|L7||up to 21/2||125||105||-150° F||16||50|
ASTM A320 L7 AISI 4140 / 4142 Bolts Manufacturer, SA320 AISI 4140 / 4142 Bolts Supplier in India- ASME, DIN, AS, BS
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