Specifications
- Bolts: ASTM A193, ASME SA193 B8C
- Nuts: ASTM A194 8C, ASME SB 194 8C
347 Stainless is an alloy that has corrosion resistance and holds up under intense temperatures. It’s weldable, has excellent mechanical properties and is helpful in high-stress applications. At Nickel Systems, our 347 Stainless Steel fasteners, such as bolts, nuts, washers and studs, leverage these properties to provide reliable, long-lasting performance in demanding conditions.
Scroll down▼ to get specifications, material information, related materials and more, or begin a quote today!
Specifications & Technical Data
If your question isn’t answered below, download the technical data sheet here.
| Density |
288 lb/in3 |
| Melting Range |
1398 – 1446°C |
| Specific Heat Capacity | 500 J/kgK |
| Thermal Conductivity (@100 °C) | 16.3 [W/mK] |
| Yield Strength, Mpa | 205 |
| Tensile Strength, Mpa | 515 |
| Elongation, % | 40 |
| Hardness [Brinell] | 201 |
347 stainless steel (UNS S34700) is a stabilized, austenitic, chromium steel alloy containing niobium and tantalum. The additions of niobium and tantalum prevent intergranular corrosion. The combination of chromium and tantalum also increase its resistance to creep deformation & stress ruptures when compared to 304 and 304L stainless steel (UNS S30400). It has strong oxidizing resistance especially compared to Stainless 321 (UNS S32100).
Other names for 347 Stainless Steel:
Check out our Nickel Systems Chemical composition breakdown chart:
If you require a good high temperature, general corrosive resistant fastener, you need 347 Stainless Steel. The following are some key characteristics for 347 stainless steel:
347 Stainless fasteners are used in corrosive environments where temperatures may cycle to over 800 degrees Fahrenheit (425 degrees Celcius). Oil refinery applications are common. Other uses for 347 Stainless are in heat sensors and thermocouples. 321 Stainless (UNS S32100/ASTM A193 B8T) is a very close relative. While 347 Stainless is stabilized by the addition of columbium and tantalum to resist intergranular corrosion, 321 is stabilized by the addition of titanium.
Stainless Steel 347 is composed of approximately 69% iron, 18% chromium, 11% nickel, and 1% manganese, with trace elements of tantalum and columbium. These last two elements help prevent carbide precipitation and enhance the steel’s workability.
| Alloy | Max Continuous Use Temperature (℃ | ℉ ) | Sample Applications |
| 304 Stainless Steel | 815℃ | 1500℉ | Food processing, cryogenics, heat exchangers |
| 316 Stainless Steel | 870℃ | 1600℉ | Chemical processing, marine exhausts |
| 347 Stainless Steel | 870 – 900℃ | 1600 – 1650℉ | Boilers, heat exchangers, exhaust manifolds |
| Inconel® 625 | 980℃ | 1800℉ | Aerospace, marine exhaust systems |
| Inconel® 600 | 1090℃ | 2000℉ | Turbines, heat treating, chemical processing |
| 330 Stainless Steel | 1120℃ | 2050℉ | Heat treating equipment, furnace components, radiant tubes |
| 310 Stainless Steel | 1150℃ | 2100℉ | Furnace parts, heat shields, combustion chambers |
| Hastelloy® X | 1200℃ | 2200℉ | Jet engines, gas turbines, aerospace applications |
If you require fasteners for use in high-temperature, corrosive environments, you need 347 Stainless Steel. The following are its key physical and mechanical properties:
The following physical properties of 347 Stainless Steel are why it is beneficial across so many applications:
The composition of this stainless steel alloy gives it excellent mechanical properties such as:
347 Stainless Steel material is easy to process because of its beneficial mechanical and physical properties. It is highly weldable, with no need for pre- or post-weld heat treatments. It’s stable at high temperatures, retains its mechanical properties, and is suitable for hot or cold working.
347 Stainless Steel fasteners have many advantages thanks to their strength, heat tolerance, durability, workability and corrosion resistance. These factors make them extremely versatile in a variety of environments. Their stability increases longevity, reducing maintenance and replacement costs and making them a cost-effective option.
Fasteners made with 347 Stainless Steel are helpful for any industry where high-heat, corrosive environments are common, such as:
For the best 347 Stainless Steel suppliers around, look no further than Nickel Systems. We stock all the 347 Stainless Steel fasteners you’ll need for any application. In addition to our standard fasteners, we offer more specialized socketed products, such as a high-torque but low-profile head. If you are working with equipment that needs pressure-equalizing features, we also have a selection of vented products.
When you decide to purchase from Nickel Systems, you will always receive our customer-first, committed care. This means we will consult with you to ensure you get the product you need, which provides the strength, versatility and durability you need.
When you need excellent suppliers of 347 Stainless Steel, we are here.
