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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 B8F Class 1
Carbide Solution Treated 303 Free-Machining Continuous & Double-End Studs
ASTM A320 Grade B8F Class 1 are produced from free-machining 303 stainless steel with carbide solution treatment for excellent machinability and consistent thread quality. These Class 1 studs provide 75 ksi minimum tensile strength and 30% elongation with selenium-enhanced chip breaking during manufacture. While corrosion resistance is slightly reduced compared to 304, B8F Class 1 remain the economical choice for instrument flanges, valve bonnet stud, and general-purpose piping where extensive machining is required and moderate corrosive exposure is acceptable.
ASTM A320/A320M Grade B8F Properties
ASTM A320/A320M Grade B8F Chemical Requirements
Austenitic Steels
| Grade Symbol | UNS Designation | C, max | Mn, max | P, max | S, max | Si, max | Ni | Cr | Se | |
|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A320 B8F | S30300(303) | Range,% | 0.15 | 2.00 | 0.20 | 00.15, min | 1.00 | 8.0 - 10.0 | 17.0- 19.0 | 0.15-0.35 |
| Product Variation, % Over or Under | 0.01 over | 0.04 over | 0.010 over | 0.20 | 0.05 over | 0.10 | 0.20 | ... | ||
ASTM A320/A320M Grade B8F 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 B8F : Class 1 | All diameters | carbide solution treated | 75 [515] | 30 [205] | 30 | 50 | 223 HBWDor 96 HRB |
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