We are the professional manufacturer of ASTM A193 B8 CL2 STUD BOLTS in China
ASTM A193 Grade B8M Class 2 Stud bolt is a carbide solution treated and strain hardened 316/316L stainless steel bolting material specification, with higher tensile strength requirement of 125 ksi or 860 MPa and 100 ksi or 690 MPa and maximum hardness of 321 HBW or 35HRC.
ASTM A193 B8M Class 2 stud bolts are commonly used in marine and other heavy industrial environments that require corrosion resistant fasteners to be used
The A193 Grade B8M CL 2 stud bolt is widely utilized in petroleum and chemical construction applications. The ASTM standard covers alloy steel and stainless steel bolting materials for high temperature or high-pressure service. This specification includes fasteners intended for use in pressure vessels, valves, flanges, and fittings. Although, this material is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
ASTM A193 Stainless threaded rod / stud bolt grades
| B8 | Class 1 Stainless steel, AISI 304, carbide solution treated. |
| B8M | Class 1 Stainless steel, AISI 316, carbide solution treated. |
| B8 | Class 2 Stainless steel, AISI 304, carbide solution treated, strain hardened |
| B8M | Class 2 Stainless steel, AISI 316, carbide solution treated, strain hardened |
2.ASTM A193 Stainless threaded rod / stud bolt chemical composition:
| Element | B8 (AISI 304) | B8M (AISI 316) |
| Carbon | 0.08% max | 0.08% max |
| Manganese | 2.00% max | 2.00% max |
| Phosphorus, max | 0.05% | 0.05% |
| Sulfur, max | 0.03% | 0.03% |
| Silicon | 1.00% max | 1.00% max |
| Chromium | 18.0 – 20.0% | 16.0 – 18.0% |
| Nickel | 8.0 – 11.0% | 10.0 – 14.0% |
| Molybdenum | 2.00 – 3.00% |
3.ASTM A193 Stainless threaded rod / stud bolt mechanical property:
ASTM A193 Grade B8M C2 Chemical properties
| Property class | Chemical composition | |||||||||
| C. | Mn. | Si. | P. | S. | Cr. | Ni. | Mo. | V. | Ti. | |
| B8M C2 | 0.08 max. | 2.00 max. | 1.00 max. | 0.045 max. | 0.030 max. | 16.00-18.00 | 10.00-14.00 | 2.00-3.00 | – | – |
ASTM A193 Grade B8M C2 Mechanical properties Inch Product
| Class | Diameter Inch | Tensile Strength, min, ksi | Yield Strength, min, 0.2 % offset, ksi | Elongation in 4 D, min % | Reduction of Area, min % | Hardness, max |
| Class 2 | 3⁄4 and under | 110 | 95 | 15 | 45 | 321 HBW or 35 HRC |
| over 3⁄4 to 1 incl | 100 | 80 | 20 | 45 | ||
| Over 1 to 11⁄4 , incl | 95 | 65 | 20 | 45 | ||
| over 11⁄4 to 11⁄2 , incl | 90 | 50 | 30 | 45 |
ASTM A193 Grade B8M C2 Mechanical properties Metric Product
A193 B8M Class 1 Stud bolts are carbide solution treated, while class 2 fasteners are carbide solution treated and strain hardened. The work hardening that occurs in the manufacturing of Class 2 fasteners increases their strength. Class 2 fasteners are differentiated by the letters “SH” after the grade marking on the fastener and an underline for both A193 and A320 fasteners. The marking typically appears on the heads of bolts or the ends of threaded studs. For both A193 and A320, the marking requirement historically was only the underline, the “SH” lettering was added in approximately 2006.
| ASTM Specification | Stainless Grade | Application | Marking Class 1 | Marking Class 2 |
|---|---|---|---|---|
| A193 Grade B8 | Type 304 | High temperature / High pressure | B8 | B8SH |
| A320 Grade B8 | Type 304 | Low temperature | B8 | B8 |
| A193 Grade B8M | Type 316 | High temperature / High pressure | B8M | B8MSH |
| A320 Grade B8M | Type 316 | Low temperature | B8M | B8M |
How to order our ASTM A193 GRADE 8M Class 2 Stud bolts？
STUD BOLTS ASTM A193 GRD B8M CLASS 2
02 HEAVY HEX NUT ASTM A194 GRD 8M
02 FLAT WASHER ASME B18.21.1, Type A, Narrow SS316
1 1/4“ UNC* 220mm，Quantity ：120 sets