What is ASTM A479 type 316 material?
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ASTM A479 Type 316 is a widely used stainless steel grade specified under the ASTM A479/A479M standard, which covers stainless steel bars and shapes primarily for pressure vessels and high-temperature service. Known for its excellent corrosion resistance and mechanical strength, Type 316 is a molybdenum-bearing austenitic stainless steel ideal for harsh environments.
Key Features of ASTM A479 Type 316 Material
Corrosion Resistance: The addition of molybdenum (2–3%) greatly improves resistance to chloride corrosion and pitting, making it suitable for marine and chemical applications.
Mechanical Properties: Offers good tensile strength (≥515 MPa), yield strength (≥205 MPa), and elongation (≥30%), ensuring durability under stress.
Heat and Temperature Resistance: Maintains strength and corrosion resistance in elevated temperatures, ideal for heat exchangers and pressure vessels.
Weldability: Excellent weldability with minimal risk of intergranular corrosion due to controlled carbon content.
Chemical Composition of ASTM A479 Type 316 (Typical)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
Mechanical Properties of ASTM A479 Type 316
The mechanical properties of ASTM A479 Type 316 stainless steel typically include a minimum yield strength of 205 MPa, a minimum tensile strength of 515 MPa, an elongation of at least 30%, and a maximum Brinell hardness of 217 HBW, ensuring strong performance in corrosive and high-temperature environments.
What is the difference between ASTM A479 Type 316 and 316L?
Type 316L has lower carbon content (≤0.03%), offering better weldability and reduced risk of intergranular corrosion after welding
Can ASTM A479 Type 316 be used in seawater applications?
Yes, its molybdenum content provides superior resistance to chloride-induced corrosion, making it suitable for marine environments.
Is ASTM A479 Type 316 suitable for high-temperature applications?
Yes, it maintains mechanical strength and corrosion resistance at elevated temperatures, often used in heat exchangers and pressure vessels.
