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Overview
Specifications
B16
The specification for ASTM A193 covers alloy and stainless steel bolting for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service. Grade B16 is a Chromium-Molybdenum-Vanadium alloy steel, similar to B7 but with Vanadium added for enhanced high-temperature properties.
COMMON GRADES
| Grade | Description |
|---|---|
| ASTM A193 B7 | Alloy steel, AISI 4140 or 4142, quenched and tempered |
| ASTM A193 B16 | Chromium-Molybdenum-Vanadium, similar to B7 with Vanadium added |
MECHANICAL CHARACTERISTICS
| Diameter | Tensile Strength, min. | Yield Strength, min. | Hardness, max. | Marking |
|---|---|---|---|---|
| 2 1/2″ and under | 125 | 105 | 321 HB or 35 HRC | B16 |
| over 2 1/2″ to 4″ | 110 | 95 | 321 HB or 35 HRC | |
| over 4″ to 8″ | 100 | 85 | 321 HB or 35 HRC |