347 Stainless Steel Bars Manufacturer
What are 347 Stainless Steel Bars?
347 stainless steel bars are austenitic chromium-nickel stainless steel bars stabilised with niobium (columbium), which prevents carbide precipitation during welding or prolonged exposure to high heat. Known for excellent intergranular corrosion resistance, SS 347 is ideal for high-temperature service, especially in applications that involve frequent heating and cooling cycles.
347 Stainless Steel Bars Specifications
| Property | Specification |
| Material Grade | SS 347 |
| UNS Number | S34700 |
| EN / WNR | 1.4550 / X6CrNiNb18-10 |
| Shapes Available | Round, Square, Hexagonal, Flat |
| Size Range | 5mm – 200mm |
| Length | Up to 6 meters (Custom lengths available) |
| Surface Finish | Bright, Peeled, Ground, Polished |
| Manufacturing Process | Hot Rolled, Cold Drawn, Centerless Ground |
| Tensile Strength | 515 – 690 MPa |
| Yield Strength | 205 MPa (min) |
| Hardness | 80 HRB (max) |
| Standards | ASTM A276, ASME SA479, EN 10088, DIN 1.4550 |
Types of 347 Stainless Steel Bars
347 Stainless Steel Bar Chemical Composition
| Element | % Composition |
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 17.0 – 20.0 |
| Nickel (Ni) | 9.0 – 13.0 |
| Niobium + Tantalum (Nb + Ta) | ≥10x C (min) |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
Mechanical Properties of 347 Stainless Steel Bars
| Property | Value |
| Tensile Strength | 515 – 690 MPa |
| Yield Strength | 205 MPa (min) |
| Elongation | 40% (min) |
| Hardness | 80 HRB (max) |
Applications of 347 Stainless Steel Bars
SS 347 bars are suited for applications involving cyclical thermal stress and corrosive exposure, such as:
Construction & Infrastructure
Automotive & Transportation
Marine & Offshore
Aerospace & Defence
Oil & Gas Industry
Manufacturing & Industrial Machinery
Why Choose Precision Alloy?
- ISO 9001:2015 Certified Manufacturer
- Wide Range of Stainless Steel Bar Shapes & Sizes in Stock
- Surface Finish Options for Decorative or Industrial Use
- Customized Machining & Fast Lead Times
- Global Delivery with Competitive Pricing
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