A193 B16 Stud Bolts
Vanadium-strengthened Cr-Mo bolting that holds its strength where B7 starts to relax — steam turbines, HP steam flanges and hot valve bonnets.
Threaded rod inserted through the holes of mating flanges, paired with heavy hex nuts. Available in every diameter and length, imperial and metric, for flanged connections in critical service. Supplied bare or coated, with full material traceability.
ASTM A193 Grade B16 is a chromium-molybdenum-vanadium alloy steel developed for bolting that operates hot for a long time. The vanadium addition and the higher molybdenum content give B16 much better creep and stress-relaxation resistance than B7 above roughly 800 °F, so bolted joints keep their clamp load through years of steam service.
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What A193 B16 must meet.
| Nominal diameter (in.) | Tensile strength, min (ksi) | Yield strength 0.2% offset, min (ksi) | Elongation in 4D, min (%) | Reduction of area, min (%) | Hardness, max |
|---|---|---|---|---|---|
| 2½ and under | 125 | 105 | 18 | 50 | 321 HBW / 35 HRC |
| Over 2½ to 4 | 110 | 95 | 17 | 45 | 321 HBW / 35 HRC |
| Over 4 to 8 | 100 | 85 | 16 | 45 | 321 HBW / 35 HRC |
Values per ASTM A193/A193M-24, Tables 1 and 2 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
Heated to 1700 to 1750 °F (925 to 955 °C), oil quenched, and tempered at 1200 °F (650 °C) minimum (A193 clause 6.1.7 and Table 2). Threads are formed after heat treatment where practical.
Full A193 B16 data sheet: chemistry, physical properties and standards →
Made to standard or to your drawing.
- Steam turbine casing and horizontal joint bolting
- High-pressure, high-temperature steam flanges
- Boiler and superheater valve bonnets
- Combined-cycle and cogeneration plants
- Hot hydrocarbon service in refineries
- Long-term creep-loaded joints