ASTM A193-B8T stud bolt ASME B18.31.2 SS321 bolt
China professional manufacturer and exporter of ASTM A193-B8T stud bolt
What is ASTM A193 B8T?
ASTM A193 B8T Bolts, also known as grade B8T, are made of Stainless steel 321,SS321 is a titanium stabilized chromium nickel austenitic stainless steel with corrosion resistance similar to 304/304. ASTM A193 Grade B8T stud bolts are frequently used in extremely high temperatures.
Corrosion resistance
Stainless steel 321 is equivalent to grade 304 in the annealed condition. It has superior corrosion resistance if a weldment in these grades has not been post-weld annealed, or if the application involves service in the 425-9000C range.
The alloy is subject to pitting and crevice corrosion in warm chloride environments and to stress corrosion cracking above 600C.
Heat resistance
Stainless steel 321 has good oxidation resistance in intermittent service to 9000C and in continuous service up to 9250C. This grade performs well in the 425-9000C range and particularly where subsequent aqueous conditions are present.
Grade B8T is made of SS321 stainless steel,offering a balanced combination of chromium, nickel, and titanium for maximum durability and performance.
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 composition of 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 B8T: Mechanical Properties
| Class 1 | ||
| Tensile Strength Min, Ksi | 75 | |
| Yield Strength min, 0.2% offset Ksi | 30 | |
| Elongation in min% | 30 | |
| Reduction of Area min% | 50 | |
| Hardness Max | 96 HRB |
| Class 2 | ¾” and Under | ¾” to 1” Inc. |
| Tensile Strength Min, Ksi | 125 | 115 |
| Yield Strength min, 0.2% offset Ksi | 100 | 80 |
| Elongation in min% | 12 | 15 |
| Reduction of Area min% | 35 | 35 |
| Hardness Max | 35 HRC | 35 HRC |
| Class 2 | Over 1” to 1.1/4” Inc. | Over 1.1/4” to 1.1/2” Inc. |
| Tensile Strength Min, Ksi | 105 | 100 |
| Yield Strength min, 0.2% offset Ksi | 65 | 50 |
| Elongation in min% | 20 | 28 |
| Reduction of Area min% | 35 | 45 |
| Hardness Max | 35 HRC | 35 HRC |
ASTM A193 B8T Stud bolt specification
SIZE:1/4″ – 4″, M6 -M100. And 600mm Max length.
THREAD:ASME B1.1 , UNC, UNF, CLASS 2A
FINISHED:Plain, PTFE coated
ASTM A193 B8T 321 stud bolt is a premium-quality fastener designed for high-temperature and high-pressure applications. Manufactured from austenitic stainless steel, specifically Type 321 (stabilized with titanium), this stud bolt offers exceptional performance in demanding environments such as chemical plants, petrochemical refineries, and power generation facilities.
