ASTM A320 Grade B8 Threaded Rod, ASTM A320 Grade B8 Stud Bolt, Grade B8 Bolts, ASTM A320 Gr B8 Studs Suplier in Mumbai, India.
Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
ASTM A320 Grade B8 Class 1 bolts and threaded studs are manufactured from AISI 304 stainless steel. These bolts are heated and then water-quenched through carbide solution treatment, or solution annealing, which ensures the bolts are corrosion resistant. A320 Grade B8 Class 2 bolts are annealed and strain hardened to achieve increased strength characteristics. These bolts do not require an impact test.
Bolting A320 Grade B8
| B8 Class 1 Stainless steel |
AISI 304, carbide solution treated |
| B8 Class 2 Stainless steel |
AISI 304, carbide solution treated, strain hardened |
ASTM A320 Grade B8 Chemical Composition
| Element |
B8 (AISI 304) |
| Carbon |
0.08% max |
| Manganese |
2.00% max |
| Phosphorus, max |
0.045% |
| Sulfur, max |
0.030% |
| Silicon |
1.00% max |
| Chromium |
18.0 - 20.0% |
| Nickel |
8.0 - 11.0% |
ASTM A320 Grade B8 Mechanical Properties
| Grade |
Size |
Tensile ksi, min |
Yield, ksi, min |
Elong, %, min |
RA % min |
Charpy Impact
20-ft-lbf
@ temp |
| B8 Class 1 |
All |
75 |
30 |
30 |
50 |
N/A |
| B8 Class 2 |
Up to 3/4 |
125 |
100 |
12 |
35 |
N/A |
| 7/8 - 1 |
115 |
80 |
15 |
35 |
N/A |
| 1-1/8 - 1-1/4 |
105 |
65 |
20 |
35 |
N/A |
| 1-3/8 - 1-1/2 |
100 |
50 |
28 |
45 |
N/A |
A320 Grade B8 Recommended Hardware
| Grade |
Nuts |
Washers |
| B8 Class 1 |
A194 Grade 8 |
SS304 |
| B8 Class 2 |
A194 Grade 8 |
SS304 |