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ASTM A320 Grade L7B Stud Bolts | UNS G41370 Specifications
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  • ASTM A320 Grade L7B Stud Bolts

    • ASTM A320 Grade L7B Stud Bolts

    G41370

    A320 Grade L7B Stud Bolts are manufactured from 4037 Alloy Steel in accordance with ASTM A320 specification. Torqbolt is a prominent A320 Grade L7B Stud Bolt supplier in India.

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    ASTM A320 Grade L7B Stud Bolts Properties

    ASTM A320 Grade L7B Stud Bolts Chemical Requirements

    Ferritic Steels

    Grade Symbol Description C Mn P,  max S, max Si Ni Cr Mo B
    ASTM A320 L7B Cr - Mo (AISI 4137) Range,% 0.35 - 0.40 0.70 - 0.90 0.035 0.04 0.15 - 0.35 ... 080 - 110 0.15 - 0.25 ...
    Product Variation, % Over or Under 0.02 0.03 0.005 over 0.005 over 0.02 ... 0.05 0.02 ...

    ASTM A320 Grade L7B Stud Bolts Mechanical Requirements

    Ferritic Steels

    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 L7B 21/2 [65] and underA quenched and tempered 1100 [593] 125[860] 105[725] 16 50 321 HBW or 35  HRC

    ASTM A320/A320M Impact Test Requirements

    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 L7B - 150 - 101 10 × 7.5 16 [22] 12 [16]
    10 × 10 40 [54] 30 [41]

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