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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 a low-carbon, nitrogen-bearing austenitic stainless steel (UNS S30453) in the Class 1A condition. Table 3 limits carbon to 0.030% maximum and requires nitrogen of 0.10 to 0.16%. Class 1A bolting is carbide solution treated in the finished condition for corrosion resistance, with the same 75 ksi [515 MPa] tensile and 30 ksi [205 MPa] yield minimums as the other Class 1A grades and a maximum hardness of 192 HBW or 90 HRB (Table 1). Grade B8LNA is exempt from impact testing above -425°F [-255°C] (6.2.1.1), making ASTM A320/A320M Grade B8LNA Class 1A suitable for low temperature pressure vessel, valve, flange, and fitting bolting.

    ASTM A320/A320M Grade B8LNA Class 1A Properties

    ASTM A320/A320M Grade B8LNA Class 1A 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 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

    Related ASTM A320 pages

    Related Keywords

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