SS 321 Square Bar Manufacturer
SS 321 Square Bar is a titanium-stabilised austenitic stainless steel specifically developed to deliver excellent performance in high-temperature and welded applications. This grade offers superior resistance to intergranular corrosion, especially after welding or prolonged exposure to elevated temperatures.
We manufacture and supply SS 321 square bars in a wide range of sizes and finishes. Our products are engineered to meet stringent quality standards and are widely used in heat exchangers, exhaust systems, aerospace components, and thermal processing equipment.
What is SS 321 Square Bar?
SS 321 (UNS S32100) is an austenitic stainless steel alloy that contains titanium as a stabilising element. Titanium combines with carbon to form stable titanium carbides, which prevents the formation of chromium carbides at grain boundaries during welding or high-temperature exposure.
This stabilization mechanism protects the material from intergranular corrosion, a common issue in unstabilized stainless steels exposed to temperatures between 450°C and 850°C. As a result, SS 321 square bars are highly suitable for applications involving continuous or intermittent high-temperature service.
SS 321 is non-magnetic in the annealed condition, offers excellent toughness, and performs reliably at temperatures up to 870°C, making it a preferred choice for heat-resistant structural components.
SS 321 Square Bar Specifications
| Parameter | Specification |
|---|---|
| Product Name | SS 321 Square Bar |
| Size Range | 6 × 6 mm to 150 × 150 mm |
| Length | 1000 mm to 6000 mm (Custom lengths available) |
| Finish Available | Black, Bright |
| Condition | Annealed |
| Manufacturing Process | Hot Rolled / Cold Drawn |
| Tolerance | h9 / h10 / Custom |
| Standard | ASTM A276 / A479 |
| Certification | EN 10204 3.1 / 3.2, ISO Certified |
Chemical Composition of SS 321 (%)
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5 × Carbon content |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties – SS 321 Square Bar
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2%) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HB |
| Modulus of Elasticity | ~193 GPa |
| Magnetic | No |
| Heat Treatable | No |
Applications of SS 321 Square Bars
Our SS 316 Square Bars find their application across a broad spectrum of industries due to their robustness and adaptability:
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
