Related Specifications
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 B8T Class 1 Stud Bolts
Carbide Solution Treated 321 Titanium Stabilized Continuous & Double-End Studs
ASTM A320 Grade B8T Class 1 stud bolts feature titanium stabilization with carbide solution treatment for superior resistance to chromium carbide precipitation during welding and thermal exposure. These Class 1 studs manufactured from AISI 321 offer 75 ksi tensile strength and 30% elongation with maximum 223 HBW hardness. The titanium content of 5x(C+N) minimum ensures B8T Class 1 stud bolts maintain intergranular corrosion resistance in as-welded flanges, making them essential for heat exchanger tube sheets, furnace piping, and cyclic temperature applications where post-weld solution treatment is impractical.
ASTM A320/A320M Grade B8T Stud Bolts Properties
ASTM A320/A320M Grade B8T Stud Bolts Chemical Requirements
Austenitic Steels
| Grade Symbol | UNS Designation | C, max | Mn, max | P, max | S, max | Si, max | Ni | Cr | Ti | N | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A320 B8T | S32100(321) | Range,% | 0.08 | 2.00 | 0.045 | 0.030, max | 1.00 | 9.0- 12.0 | 17.0- 19.0 | 5 × (C+N) min -0.7 max | 010, 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 | 1 | ||
ASTM A320/A320M Grade B8T 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 B8T Class 1 | All diameters | carbide solution treated | 75 [515] | 30 [205] | 30 | 50 | 223 HBWDor 96 HRB |
Related Keywords
Satisfaction Survey
