B16Stud bolt
ASTM A193 Grade B16
The high-temperature grade. Vanadium raises the creep resistance so the joint keeps its bolt load up to 538 °C — steam lines, reformer flanges and hot hydrogen service where B7 would relax.
- Base material
- Chromium-molybdenum-vanadium alloy steel
- Heat treatment condition
- Quenched and tempered at 650 °C minimum
- Hardness, max
- 321 HBW / 35 HRC maximum
Service temperature
-29 °C+538 °C−273+900 °C
Chosen over B7 whenever the design temperature passes 427 °C. Pair with A194 grade 4 or grade 7 nuts, not 2H, when the standard calls for it.
Chemical composition
| Element | Min (% by weight) | Max (% by weight) |
|---|---|---|
| C | 0.36 | 0.47 |
| Mn | 0.45 | 0.70 |
| P | — | 0.035 |
| S | — | 0.040 |
| Si | 0.15 | 0.35 |
| Cr | 0.80 | 1.15 |
| Mo | 0.50 | 0.65 |
| V | 0.25 | 0.35 |
Mechanical properties
| Diameter | Tensile strength, min | Yield strength, min | Elongation, min | Reduction of area, min |
|---|---|---|---|---|
| ≤ 2½ in (≤ M64) | 860 MPa (125 ksi) | 725 MPa (105 ksi) | 18 % | 50 % |
| > 2½ – 4 in (M64–M100) | 760 MPa (110 ksi) | 655 MPa (95 ksi) | 17 % | 45 % |
| > 4 – 7 in (M100–M180) | 690 MPa (100 ksi) | 585 MPa (85 ksi) | 16 % | 45 % |
Matching nuts
Recommended coatings
Equivalent grades
- 1Cr-0.5Mo-V
- EN 21CrMoV5-7
- DIN 1.7709
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