ASTM A320 Grade L7M Stud Bolts | UNS G41400 Specifications

ASTM A320 Grade L7M Stud Bolts

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.

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ASTM A320 Grade L7M Stud Bolts Properties

ASTM A320 Grade L7M Stud Bolts Chemical Requirements

Ferritic Steels

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 ...

ASTM A320 Grade L7M 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 L7M 21/2[65] and underA quenched and tempered 1150 [620] 100[690] 80[550] 18 50 235 HBWBor 99 HRB

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 L7M - 100 - 73 10 × 10 20 [27] 15 [20]
10 × 7.5 16 [22] 12 [16]
10 × 10 20 [27] 15 [20]

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