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 Grades B6X
| Grade |
Tensile Class |
Raw Material Description |
| B6X |
|
13% Chromium Ferritic Steel |
ASTM A193 Grade B6X Chemical Composition
| Ferritic Steels |
| Element |
Grade B6X |
| Carbon |
0.08-0.15 |
| Manganese, max |
1.00 |
| Phosphorus, max |
0.040 |
| Sulfur, max |
0.030 |
| Silicon |
1.00 max |
| Chromium |
11.5-13.5 |
| Molybdenum |
-- |
| Vanadium |
-- |
| Aluminium, max |
-- |
ASTM A193 Mechanical Properties
| Grade |
Diameter |
Tensile Strength |
Yield Strength |
Elongation |
Reduction |
Hardness |
| Grade B6X |
Up to M100, inclusive |
620 |
485 |
16 |
50 |
26 HRC |
Heat Treatment
ASTM A193 Marking Requirements
Recommended Nuts & Washers
| Bolting Grade |
Nut Grade |
Washer Grade |
| ASTM A193 Grade B6X |
ASTM A194 Grade 6 |
Mild Steel |