ASTM A320 Grade B8M Stud Bolts Properties

ASTM A320 Grade B8M Stud Bolts Chemical Requirements

Austenitic Steels

Grade Symbol UNS Designation C, max Mn, max P, max S, max Si, max Ni Cr Mo Se Ti N Nb E + Ta
ASTM A320 B8M S31600(316) Range,% 0.08 2.00 0.045 0.030, max 1.00 10.0 - 14.0 16.0 - 18.0 2.00 - 3.00 ... ... ... ...
Product Variation, % Over or Under 0.01 over 0.04 over 0.010 over 0.005 over 0.05 over 0.15 0.20 0.10 ... ... ... ...

ASTM A320 Grade B8M 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, % Hardness, max
ASTM A320 B8M Class 1 All diameters carbide solution treated ... 75 [515] 30 [205] 30 50 223 HBWDor  96 HRB
ASTM A320 B8M Class 2 3/4 [20] and under carbide solution treated and strain  hardened ... 110 [760] 95 [655] 15 45 321 HBW or 35  HRC
over 3/4 to 1 [20 to 25], incl ... 100 [690] 80 [550] 20 45 321 HBW or 35  HRC
over 1 to 11/4 [25 to 32], incl ... 95 [655] 65 [450] 25 45 321 HBW or 35  HRC
over 11/4 to 11/2 [32 to 40], inclA ... 90 [620] 50 [345] 30 45 321 HBW or 35  HRC

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