ASTM A193 specification covers alloy and stainless steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications. Several grades are covered, including ferritic steels and austenitic stainless steels designated B5, B6, B7, B8, B8M, etc. Selection will depend upon design, service conditions, mechanical properties, and high temperature characteristics. This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable A193M specification designation (SI units), the inch-pound units shall apply
| Grade | Tensile Class | Raw Material Description |
|---|---|---|
| B8LN | AISI 304LN Stainless Steel, Carbide Solution Treated |
| Austenitic Steels, Classes 1C and 1D | |
|---|---|
| Element | Grade B8S, B8SA |
The material as represented by the tension specimens shall conform to the requirements at room temperature after heat treatment. Alternatively, stainless strain hardened fasteners (Class 2, 2B, and 2C) shall be tested full size after strain hardening to determine tensile strength and yield strength and shall conform to the requirements prescribed in Table 2 and 3. Should the results of full size tests conflict with results of tension specimen tests, full size test results shall prevail.
| Grade | Diameter | Tensile Strength | Yield Strength | Elongation | Reduction | Hardness |
|---|
| Class | Grade | Grade Symbol |
|---|---|---|
| Class 1 | B8 B8C B8M B8P B8T B8LN B8MLN B8CLN |
B8 B8C B8M B8P B8T B8F or B8LN B8G or B8MLN B8Y or B8CLN |
| Class 1D | B8LN | B97 |
| Bolting Grade | Nut Grade | Washer Grade |
|---|