321 Stainless Steel Bar

1. Product Overview

321 stainless steel bar is a titanium-stabilized austenitic stainless steel that offers excellent resistance to intergranular corrosion after welding or high-temperature exposure. 🛡️ It maintains strength and oxidation resistance up to 870°C, making it suitable for pressure vessels, exhaust systems, and heat exchangers in aggressive environments. It is widely used where welding is required but carbide precipitation must be avoided.

2. Available Sizes

• 📏 Type: Round bar, Square bar, Flat bar, Hex bar
• 📐 Diameter (Round): 6mm – 250mm
• 📏 Length: 1000mm – 6000mm (customizable)
• 🎯 Tolerances: h9, h10, h11 (as required)
• 📚 Standards: ASTM A276, ASTM A479, EN 10088-3, JIS G4303

3. Chemical Composition

Element	Content (%)
C	≤ 0.08
Si	≤ 1.00
Mn	≤ 2.00
P	≤ 0.045
S	≤ 0.030
Cr	17.0 – 19.0
Ni	9.0 – 12.0
Ti	≥ 5 × C (min) – ≤ 0.70

4. Mechanical Properties

Property	Value (Annealed)
Tensile Strength	≥ 515 MPa
Yield Strength	≥ 205 MPa
Elongation (%)	≥ 40%
Hardness (HB)	≤ 217

5. Features & Advantages

• ✅ Excellent resistance to intergranular corrosion after welding
• 🔥 High-temperature oxidation resistance up to 870°C
• 🛠️ Stable mechanical properties under thermal stress
• ✅ Good weldability and formability
• 🔧 Suitable for long-term service in heat-exposed structures

6. Applications

7. Surface Finish

• 🖤 Black
• 🧼 Pickled
• ✨ Bright
• 🔧 Polished (180#, 240#, 320#, 400#)
• 🌀 Turned / Peeled / Ground

8. Processing Services

• ✂️ Precision cutting to length
• 🧽 Surface grinding and polishing
• 🔩 Machining and threading
• 📏 Custom tolerances and dimensions
• 🛠️ Heat-resistant bar customization