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    2. Grade B8MLNA Class 1A

    ASTM A320/A320M Grade B8MLNA Class 1A Low-Carbon Nitrogen-Enhanced Stainless Steel Bolting

    Class 1A Low Temperature Fasteners - AISI 316LN Solution Treated

    ASTM A320/A320M Grade B8MLNA Class 1A represents the premium low-carbon, nitrogen-enhanced variant of 316 stainless steel, combining molybdenum and nitrogen for superior corrosion resistance. With maximum carbon content of 0.030% and nitrogen addition of 0.10-0.16%, B8MLNA delivers exceptional resistance to pitting, crevice corrosion, and intergranular attack. Class 1A solution treatment limits hardness to 192 HBW while maintaining 75 ksi tensile strength, making ASTM A320/A320M Grade B8MLNA Class 1A essential for marine environments, chemical processing, and low temperature applications requiring maximum corrosion performance.

    ASTM A320/A320M Grade B8MLNA Class 1A Stud Bolts Properties

    ASTM A320/A320M Grade B8MLNA Class 1A Stud Bolts Chemical Requirements

    Austenitic Steels

    Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr Mo N
    ASTM A320 B8MLNA Class 1A S31653 Range,% 0.030 2.00 0.045 0.030 1.00 10.0-13.0 16.0-18.0 2.00-3.00 0.10-0.16
    Product Variation, % Over or Under 0.005 over 0.04 over 0.010 over 0.005 over 0.05 over 0.15 0.20 0.10 0.01

    ASTM A320/A320M Grade B8MLNA Class 1A Stud Bolts Mechanical Requirements

    Austenitic Steels

    Grade and Class 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, %
    ASTM A320 B8MLNA 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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