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    2. ASTM A320/A320M Grade B8LNA Class 1A

    ASTM A320/A320M Grade B8LNA Class 1A Low-Carbon Nitrogen-Enhanced Stainless Steel Bolting

    Class 1A Low Temperature Fasteners - AISI 304LN Solution Treated

    ASTM A320/A320M Grade B8LNA Class 1A is an advanced low-carbon, nitrogen-bearing austenitic stainless steel that enhances the performance of standard 304L material. With maximum carbon content of 0.030% and nitrogen addition up to 0.16%, B8LNA achieves higher yield strength and improved resistance to sensitization during welding. Class 1A solution treatment limits hardness to 192 HBW while maintaining excellent formability, making ASTM A320/A320M Grade B8LNA Class 1A ideal for heavily welded pressure vessels, structural components in corrosive environments, and low temperature applications requiring maximum toughness and fabrication flexibility.

    ASTM A320/A320M Grade B8LNA Class 1A Stud Bolts Properties

    ASTM A320/A320M Grade B8LNA Class 1A Stud Bolts Chemical Requirements

    Austenitic Steels

    Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr N
    ASTM A320 B8LNA Class 1A S30453 Range,% 0.030 2.00 0.045 0.030 1.00 8.0-11 18.0-20.0 0.10-0.16

    ASTM A320/A320M Grade B8LNA Class 1A Stud Bolts Mechanical Requirements

    Austenitic Steels

    Grade and Class Diameter, in. [mm] Heat Treatment 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 B8LNA Class 1A All diameters carbide solution treated in the  finished condition 75 [515] 30 [205] 30 50 192 HBW or 90  HRB

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