ASTM A193 B8T Stud bolt ASME B18.31.2 SS321 bolt
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ASTM A193 is a Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service
Grade B8T refers to Type 321 stainless steel, which is stabilized against chromium carbide precipitation by the addition of titanium.
ASTM A193 Grade B8T material specification.
| Grade | Tensile Class | Raw Material Description |
|---|---|---|
| B8T | Class 1 | AISI 321 Stainless Steel, Carbide Solution Treated |
| B8T | Class 2 | AISI 321 Stainless Steel, Carbide Solution Treated and Strain Hardened |
Chemical Properties – A193 B8T
| C | Mn | P | S | Si | Cr | Ni | Mo | Ti | Cu | W | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | – | – | – | – | – | 17.0 | 9.0 | – | * | – | – | – |
| Max | 0.08 | 2.0 | 0.045 | 0.030 | 1.0 | 19.0 | 12.0 | – | * | – | – | Bal |
*Titanium = 5 x (Carbon + Nitrogen) min; 0.70 max
| ASTM A193 Grade B8T Mechanical Properties | ||||||
| Grade | Diameter | Tensile Strength | Yield Strength | Elongation | Reduction | Hardness |
|---|---|---|---|---|---|---|
| Grade B8T, Class 2 | M20 and under | 860 | 690 | 12 | 35 | 321 HBW or 35 HRC |
| Grade B8T, Class 2 | M20 to M24, inclusive | 690 | 550 | 20 | 45 | 321 HBW or 35 HRC |
| Grade B8T, Class 2 | M24 to M30, inclusive | 655 | 450 | 25 | 45 | 321 HBW or 35 HRC |
| Grade B8T, Class 2 | M30 to M36, inclusive | 620 | 345 | 30 | 45 | 321 HBW or 35 HRC |
| Grade B8T, Class 1 | All Diameters | 515 | 205 | 30 | 50 | 192 HVW or 90 HRB |
ASTM A193 B8T Stud bolt with ASTM A194 Grade 8T Hex nuts
| Bolting Grade | Nut Grade | Washer Grade |
|---|---|---|
| ASTM A193 Grade B8T | ASTM A194 Grade 8T | SS 321 |
ASTM A193 B8T Stud bolt specification
SIZE:1/4″ – 5″, M6 -M100. And 600mm Max length.
THREAD:ASME B1.1 , UNC, UNF, CLASS 2A
FINISHED:Plain, PTFE coated
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