Stainless Steel 347 Fasteners are corrosion-resistant, heat-resistant austenitic stainless steel fasteners stabilized with niobium (columbium). They are designed for applications involving elevated temperatures, corrosive environments, and repeated heating and cooling cycles. Also identified as UNS S34700 and WNR 1.4550, SS 347 is commonly supplied as bolts, nuts, stud bolts, screws, threaded rods and washers. We supply ASTM A193 Grade 347 / B8C fasteners and matching ASTM A194 Grade 8C nuts for industrial applications.
SS 347 Fasteners – ASTM A193 B8C Bolts & ASTM A194 8C Nuts
Stainless Steel 347 is a stabilized version of 18Cr-10Ni austenitic stainless steel. Its niobium stabilization helps minimize chromium carbide precipitation during exposure to elevated temperatures, making it suitable for applications where welding and high-temperature service are involved.
We manufacture and supply SS 347 Fasteners in different dimensions, thread configurations, pressure classes and finishes according to customer requirements and applicable standards.
Table of Contents
- ➤ Key Features and Advantages of SS 347 Fasteners
- ➤ Stainless Steel 347 Fasteners Types
- ➤ Stainless Steel 347 Fasteners Specifications
- ➤ Stainless Steel 347 Chemical Composition
- ➤ Stainless Steel 347 Mechanical Properties
- ➤ Stainless Steel 347 Physical Properties
- ➤ Stainless Steel 347 Fasteners Equivalent Grades
- ➤ Manufacturing Process of SS 347 Fasteners
- ➤ Applications of 347 Stainless Steel Fasteners
- ➤ Why Choose Us for Stainless Steel 347 Fasteners?
Key Features and Advantages of SS 347 Fasteners
SS 347 fasteners are selected where conventional stainless steel fasteners may not provide the required combination of temperature resistance, corrosion resistance and long-term structural performance.
Key advantages include:
- Excellent resistance to intergranular corrosion after exposure to elevated temperatures
- Good oxidation resistance for high-temperature service
- Good resistance to general atmospheric and chemical corrosion
- Excellent toughness and ductility
- Good weldability and formability
- Suitable for repeated heating and cooling cycles
- Good mechanical performance at elevated temperatures
- Niobium stabilization improves resistance to carbide precipitation
- Available in multiple bolt, nut, screw and stud configurations
- Suitable for demanding petrochemical, power generation and process-industry applications
The combination of corrosion resistance and high-temperature stability makes 347 Stainless Steel Bolts and Nuts suitable for equipment exposed to thermal cycling and corrosive process conditions.
Stainless Steel 347 Fasteners Types
We supply SS 347 fasteners in standard and customized configurations, including:
- UNS S34700 Stud Bolts
- UNS S34700 Hex Bolts
- Stainless Steel 347 Heavy Hex Bolts
- SS 347 Hex Nuts
- ASTM A194 Grade 8C Nuts
- Stainless Steel 347 Washers
- SS 347 Threaded Rods
- SS 347 Screws
- SS 347 Machine Screws
- SS 347 Socket Head Cap Screws
- SS 347 U-Bolts
- SS 347 Anchor Bolts
- Custom-designed fasteners
Depending on the application, fasteners can be supplied with different thread forms, lengths, diameters, head styles and surface finishes.
Stainless Steel 347 Fasteners Specifications
| Property | Details |
|---|---|
| Product | Stainless Steel 347 Fasteners |
| Grade | SS 347 |
| UNS | S34700 |
| Werkstoff Number | 1.4550 |
| EN Grade | 1.4550 |
| British Standard | BS 320S31 |
| GOST | 08Ch18N12B |
| ASTM Fastener Standard | ASTM A193 B8C |
| Nut Standard | ASTM A194 Grade 8C |
| ASME Standard | ASME SA193 |
| Product Forms | Bolts, Nuts, Stud Bolts, Screws, Rods, Washers |
| Threads | UNC, UNF, Metric, BSW and customized |
| Manufacturing | Forged, machined or cold formed, depending on size |
| Finish | Plain, polished or customized |
Note: Exact dimensions, mechanical requirements, heat treatment and testing requirements should be confirmed against the applicable purchase specification and ASTM/ASME standard.
Stainless Steel 347 Chemical Composition
| Element | Typical Composition (%) |
|---|---|
| Chromium (Cr) | 17.0–20.0 |
| Nickel (Ni) | 9.0–13.0 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Columbium + Tantalum (Nb + Ta) | Stabilized grade |
| Iron (Fe) | Balance |
Values may vary depending on the applicable product standard and material specification.
Stainless Steel 347 Mechanical Properties
Typical mechanical properties for SS 347 include:
| Property | Typical Value |
|---|---|
| Tensile Strength | ~515 MPa minimum |
| Yield Strength | ~205 MPa minimum |
| Elongation | ~40% minimum |
| Hardness | Typically ≤ 201 HB |
For fasteners manufactured to ASTM A193 B8C, the applicable mechanical requirements depend on the product class, diameter and heat-treatment condition. Project specifications should therefore be checked before ordering.
Stainless Steel 347 Physical Properties
| Property | Typical Value |
|---|---|
| Density | ~8.0 g/cm³ |
| Melting Range | ~1398–1446°C |
| Thermal Conductivity | ~16 W/m·K |
| Modulus of Elasticity | ~193 GPa |
| Specific Heat | ~500 J/kg·K |
| Electrical Resistivity | ~0.72 µΩ·m |
These properties make SS 347 suitable for components exposed to temperature fluctuations and industrial operating conditions.
Stainless Steel 347 Fasteners Equivalent Grades
| Standard | Equivalent / Designation |
|---|---|
| UNS | S34700 |
| WNR | 1.4550 |
| EN | 1.4550 |
| BS | 320S31 |
| GOST | 08Ch18N12B |
| ASTM | ASTM A193 B8C |
| ASME | ASME SA193 |
| Nuts | ASTM A194 Grade 8C |
The exact equivalence should always be verified according to the relevant standard, product form and application requirements rather than treating designations as automatically interchangeable.
Manufacturing Process of SS 347 Fasteners
Applications of 347 Stainless Steel Fasteners
Because of their resistance to corrosion and elevated-temperature service, SS 347 fasteners are commonly used in:
- Petrochemical plants
- Oil and gas processing equipment
- Power generation plants
- Heat exchangers
- Boilers and high-temperature equipment
- Chemical processing equipment
- Refinery equipment
- Aerospace applications
- Exhaust and thermal systems
- Pressure vessels
- Steam piping systems
- Process piping
- Food processing equipment
- Pharmaceutical equipment
- Industrial furnaces
ASTM A193 Grade 347 Bolts are particularly useful for bolting applications where elevated-temperature service and corrosion resistance are important.
Why Choose Us for Stainless Steel 347 Fasteners?
As a 347 Stainless Steel Fasteners Supplier, we focus on supplying material that meets the required dimensional, chemical and mechanical specifications for industrial applications.
Customers can source:- ASTM A193 B8C Fasteners
- ASME SA193 SS 347 Studs
- ASTM A194 Grade 8C Nuts
- UNS S34700 Stud Bolts
- UNS S34700 Hex Bolts
- SS 347 Threaded Rods and Screws
- Custom-size and non-standard fasteners
- Mill test certificates and inspection documentation
- Third-party inspection support when required
- Export-quality packing and documentation
We also serve as an SS 347 Stud Bolt Stockist for customers requiring standard and project-specific quantities. Our export capabilities allow us to supply Stainless Steel 347 Fasteners to international customers across different industrial markets.
Related Stainless Steel Fasteners
We also supply:
- Stainless Steel 304 fasteners
- Stainless Steel 304l Fasteners
- Stainless Steel 304H Fasteners
- Stainless Steel 309 Fasteners
- Stainless Steel 309S Fasteners
- Stainless Steel 309H Fasteners
- Stainless Steel 310 Fasteners
- Stainless Steel 310S Fasteners
- Stainless Steel 310H Fasteners
- Stainless Steel 316 Fasteners
- Stainless Steel 316L Fasteners
- Stainless Steel 316H Fasteners
- Stainless Steel 316TI Fasteners
- Stainless Steel 317 Fasteners
- Stainless Steel 317L Fasteners
- Stainless Steel 321 Fasteners
- Stainless Steel 321H Fasteners
- Stainless Steel 347 Fasteners
- Stainless Steel 347H Fasteners
- Stainless Steel 410 Fasteners
- Stainless Steel 446 Fasteners
- Stainless Steel 904L Fasteners
Buy Stainless Steel 347 Fasteners
Looking for a reliable Stainless Steel 347 Fasteners Exporter for your next project?
We can supply SS 347 Fasteners, 347 Stainless Steel Bolts and Nuts, ASTM A193 B8C Fasteners, ASTM A194 Grade 8C Nuts, UNS S34700 Stud Bolts and Hex Bolts according to your required size, quantity, standard and finish.
Request a quote today with your required fastener type, size, quantity, standard and delivery destination. Our team can provide product specifications, technical documentation and a commercial quotation based on your requirements.
Frequently Asked Questions About Stainless Steel 347 Fasteners
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