G41400
A320 Grade L7M Stud Bolts are manufactured from 4140 Alloy Steel in accordance with ASTM A320 specification. Torqbolt is a prominent A320 Grade L7M Stud Bolt supplier in India.
42Crmo4 Threaded Rod Astm A193 Grade B7 Bolts Astm A193 Grade B7M Studs Astm A194 Grade 7 Hex Nuts Astm A194 Grade 7M Nuts Astm A320 Grade L7 Studs Astm A320 Grade L70 Studs Astm A320 Grade L7M Bolts
Grade Symbol | Description | C | Mn | P, max | S, max | Si | Ni | Cr | Mo | B | |
---|---|---|---|---|---|---|---|---|---|---|---|
ASTM A320 L7M | Cr - Mo - B | Range,% | 0.38 - 0.48C | 0.75 - 1.00 | 0.035 | 0.04 | 0.15 - 0.35 | ... | 0.80 - 1.10 | 0.15 - 0.25 | ... |
Product Variation, % Over or Under | 0.02 | 0.04 | 0.005 over | 0.005 over | 0.02 | ... | 0.05 | 0.02 | ... |
Class and Grade, Diameter, in. [mm] | Heat Treatment | Minimum Tempering Temperature, °F [°C] | Tensile Strength, min, ksi [MPa] | Yield Strength, min, ksi [MPa] (0.2 % offset) | Elongation in 2 in. or 50 mm, min, % | Reduction of Area, min, % | Hardness, max |
---|---|---|---|---|---|---|---|
ASTM A320 L7M 21/2[65] and underA | quenched and tempered | 1150 [620] | 100[690] | 80[550] | 18 | 50 | 235 HBWBor 99 HRB |
Grade | Test Temperature | CVN Specimen Section Size, mm | Min Average Impact Toughness of Three Test Specimens, ft-lbf [J] | Min Impact Value of a Single Specimen of Set of Three, ft-lbf [J] | |
---|---|---|---|---|---|
°F | °C | ||||
ASTM A320 L7M | - 100 | - 73 | 10 × 10 | 20 [27] | 15 [20] |
10 × 7.5 | 16 [22] | 12 [16] | |||
10 × 10 | 20 [27] | 15 [20] |