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A193 Gr.B8C Heavy Hex Bolt
QS Fastener: A193 Gr.B8C Heavy Hex Bolt
Name: A193 Gr.B8C Heavy Hex Bolt Zhangzhou
Standard: ASME B18.2.3.5M
Material: A193 Gr. B8C
Size: M12
Lenght: 70
Surface: Natural color
Standard: ASME B18.2.3.5M
Material: A193 Gr. B8C
Size: M12
Lenght: 70
Surface: Natural color
Quantity
A193 Gr.B8C Heavy Hex Bolt M12×70 mm, manufactured to ASME B18.2.3.5M, is produced from AISI 347 austenitic stainless steel in which carbon, chromium, nickel and niobium are precisely balanced; at –196 °C it still delivers a tensile strength ≥ 515 MPa. The large hex head gives a stable torque coefficient and permits repeated assembly/dis-assembly, while roll-formed threads raise fatigue life by 30 %. The natural, coating-free finish eliminates plating contamination. Designed for petrochemical high-pressure flanges, LNG valves and nuclear pressure vessels, it is locked once and considered maintenance-free for life.
What is the material of B8C bolts?
The core material of B8C bolts is austenitic stainless steel that has been solution-treated. Its chemical composition is similar to 304 stainless steel, but through specific heat treatment and possible strain-hardening it obtains better mechanical properties and corrosion resistance. A193 Gr.B8C Heavy Hex Bolt made from this material is widely used in high-temperature, high-pressure services.
The core material of B8C bolts is austenitic stainless steel that has been solution-treated. Its chemical composition is similar to 304 stainless steel, but through specific heat treatment and possible strain-hardening it obtains better mechanical properties and corrosion resistance. A193 Gr.B8C Heavy Hex Bolt made from this material is widely used in high-temperature, high-pressure services.
The table below lets you quickly grasp the main features of A193 Gr.B8C Heavy Hex Bolt and compare them with other common bolt materials.
| Characteristic | A193 Gr.B8C (austenitic stainless) | B7/B16 (alloy steel) | Ordinary stainless (e.g. 304) |
| Core constitution | Cr, Ni austenitic structure | Cr, Mo, V, etc. | Cr, Ni (basic) |
| Strength level | High (tensile ≥ 860 MPa) | High (B7 tensile ≥ 860 MPa) | Lower (A2-70 ≈ 700 MPa) |
| Corrosion resistance | ⭐⭐⭐⭐⭐ Excellent for many corrosive media | ⭐⭐ Poor; usually needs protective coating | ⭐⭐⭐⭐ Good, but generally below heat-treated B8C |
| Temperature capability | ⭐⭐⭐⭐ High-temp, high-pressure duty | ⭐⭐⭐⭐⭐ B7 up to ~450 °C | ⭐⭐⭐ Moderate, grade-dependent |
| Heat treatment | Solution anneal + possible strain harden | Quench + temper | Solution anneal (some grades) |
| Typical applications | Pressure piping, pressure vessels, chemical plant, offshore | Steam boilers, high-temp/high-pressure piping, pumps & valves | General-purpose fasteners |
Extended material choices
Besides A193 Gr.B8C Heavy Hex Bolt, special duties may require:
- Extreme low temperatures: for LNG and similar cryogenic services, alloy-steel grades L7/L7M are selected because they retain toughness at very low temperatures.
Besides A193 Gr.B8C Heavy Hex Bolt, special duties may require:
- Extreme low temperatures: for LNG and similar cryogenic services, alloy-steel grades L7/L7M are selected because they retain toughness at very low temperatures.
- Severe corrosion: for environments with high chloride levels or mineral acids, nickel-base alloys (Inconel 625, Hastelloy C-276) or duplex stainless steels offer superior corrosion resistance and high strength, though at significantly higher cost.
Summary and selection guide
In short, A193 Gr.B8C Heavy Hex Bolt can be viewed as “304 stainless steel with enhanced strength”. Use the following logic when choosing:
- Good corrosion resistance plus high strength for critical joints such as pressure-piping or chemical-plant flanges → give priority to A193 Gr.B8C Heavy Hex Bolt.
In short, A193 Gr.B8C Heavy Hex Bolt can be viewed as “304 stainless steel with enhanced strength”. Use the following logic when choosing:
- Good corrosion resistance plus high strength for critical joints such as pressure-piping or chemical-plant flanges → give priority to A193 Gr.B8C Heavy Hex Bolt.
- Service dominated by high temperature and pressure but with mild corrosion → B7 alloy steel is an economical, reliable choice.
- Ordinary atmospheric environment with moderate strength demand → conventional A2-70 or A4-70 stainless bolts are usually sufficient.
We hope this information gives you a comprehensive understanding of the A193 Gr.B8C Heavy Hex Bolt material. If you can tell us the exact service conditions (medium, temperature, pressure), we can provide a more precise selection recommendation.
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