What material is A479 S32750?
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What Material is A479 S32750? – Properties, Applications & Buyer Guide
What material is A479 S32750?
A479 S32750 is a super duplex stainless steel specified under ASTM A479, commonly used in bars, rods, and shapes for high-strength and corrosion-resistant applications. Also known as UNS S32750, this material is a combination of high chromium, molybdenum, and nitrogen content that delivers superior resistance to pitting, crevice corrosion, and stress corrosion cracking, making it ideal for chemical, oil & gas, and marine industries.
What standards cover S32750 stainless steel?
Key standards include ASTM A479 (bars and rods), ASTM A182 (for flanges and fittings), and UNS S32750 (UNS designation for chemical composition reference).
Chemical Composition of A479 S32750 steel bar
| Element | Typical Range (%) |
|---|---|
| Chromium (Cr) | 24 – 26 |
| Nickel (Ni) | 6.5 – 8.0 |
| Molybdenum (Mo) | 3.0 – 3.5 |
| Nitrogen (N) | 0.24 – 0.32 |
| Copper (Cu) | 0.5 – 1.0 |
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.8 |
Mechanical Properties of A479 S32750 round bar
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 800 – 900 |
| Yield Strength (0.2% offset, MPa) | 550 – 650 |
| Elongation (%) | ≥ 25 |
| Hardness (HRB) | ≤ 95 |
| Impact Toughness (J at 0°C) | ≥ 150 |
Note: These values may vary depending on the product form (bar, rod, or tube) and heat treatment.
Can A479 S32750 be welded?
Yes, but proper procedures must be followed, including low heat input, post-weld solution annealing, and using compatible filler materials to preserve corrosion resistance and mechanical properties.
Is A479 S32750 suitable for seawater?
Absolutely. With high chromium, molybdenum, and nitrogen content, it offers excellent resistance to pitting, crevice corrosion, and chloride-induced stress corrosion, making it ideal for marine and offshore applications.
What is the difference between S32750 and 904L stainless steel?
S32750 is a super duplex stainless steel with higher tensile strength and better chloride stress corrosion resistance, while 904L is a high-alloy austenitic stainless steel primarily for chemical resistance. S32750 is stronger and often preferred in oil, gas, and marine industries.
What forms and sizes are available?
GNEE supplies A479 S32750 in bars, rods, tubes, and custom-cut lengths. Diameters range from 6 mm to 630 mm, with lengths up to 6 meters, meeting ISO 9001 and PED standards. For detailed chemical composition and free samples, please contact our factory today. We offer competitive pricing and excellent service.Email: info@gneestainless.com
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