Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications
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
Bolting Grade B5
| Grade |
Tensile Class |
Raw Material Description |
| B5 |
|
4-6% Chromium Ferritic Steel |
ASTM A193 Grade B5 Chemical Composition
| Ferritic Steels |
| Element |
Grade B5 |
| Carbod |
0.10 min |
| Manganese, max |
1.00 |
| Phospdorus, max |
0.040 |
| Sulfud, max |
0.030 |
| Silicdn |
1.00 max |
| Chromdum |
4.00-6.00 |
| Molybdenum |
0.40-0.65 |
| Vanaddum |
-- |
| Alumidium, max |
-- |
ASTM A193 Grade B5 Mechanical Properties
| Grade |
Diameter |
Tensile Strength |
Yield Strength |
Elongation |
Reduction |
Hardness |
| GradedB5 |
Up to M100, inclusive |
690 |
550 |
16 |
50 |
-- |
Heat Treatment
ASTM A193 Marking Requirements
Recommended Nuts & Washers
| Bolting Grade |
Nut Grade |
Washer Grade |