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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 B8C Class 1 Stud Bolts
Carbide Solution Treated 347 Columbium Stabilized Continuous & Double-End Studs
ASTM A320 Grade B8C Class 1 stud bolts feature columbium stabilization combined with carbide solution treatment for unmatched resistance to intergranular corrosion in welded assemblies. Manufactured as fully threaded continuous studs or double end studs from AISI 347, these Class 1 fasteners offer 75 ksi tensile strength with maximum 223 HBW hardness with exceptional stability through thermal cycling. The columbium addition prevents chromium carbide precipitation, making B8C Class 1 stud bolts essential for refinery flanges, high-temperature exhaust systems, and process equipment requiring post-weld integrity without sensitization.
ASTM A320/A320M Grade B8C Stud Bolts Properties
ASTM A320/A320M Grade B8C Stud Bolts Chemical Requirements
Austenitic Steels
| Grade Symbol | UNS Designation | C, max | Mn, max | P, max | S, max | Si, max | Ni | Cr | Nb E + Ta | |
|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A320 B8C | S34700(347) | Range,% | 0.08 | 2.00 | 0.045 | 0.030 |
1.00 | 9.0- 12.0 | 17.0- 19.0 | 10 × C content, min -1.10 max |
| Product Variation, % Over or Under | 0.01 over | 0.04 over | 0.010 over | 0.005 over | 0.05 over | 0.15 | 0.20 | 0.05 under | ||
ASTM A320/A320M Grade B8C 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 B8C Class 1 | All diameters | carbide solution treated | 75 [515] | 30 [205] | 30 | 50 | 223 HBWDor 96 HRB |
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