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Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
ASTM A320 Grade B8M Class 1 Stud Bolts
Carbide Solution Treated 316 Molybdenum-Bearing Continuous & Double-End Studs
ASTM A320 Grade B8M Class 1 stud bolts are manufactured from carbide solution treated 316 stainless steel containing 2-3% molybdenum for superior pitting resistance. These Class 1 continuous threaded and double end studs offer 75 ksi tensile strength with 30% minimum elongation and maximum hardness of 223 HBW. The enhanced chloride resistance makes B8M Class 1 stud bolts indispensable for marine flanges, chemical reactor vessels, pulp digesters, and offshore platform piping where both corrosive exposure and cryogenic toughness demand premium austenitic material.
ASTM A320/A320M Grade B8M Stud Bolts Properties
ASTM A320/A320M 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 | |
|---|---|---|---|---|---|---|---|---|---|---|
| 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/A320M Grade B8M 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 B8M Class 1 | All diameters | carbide solution treated | 75 [515] | 30 [205] | 30 | 50 | 223 HBWDor 96 HRB |
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