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ASTM A479 S32760 (Super Duplex Zeron 100): Understanding the Bar Spec & How to Source It in Plate Form
ASTM A479 S32760 is a commonly searched specification combination in the stainless steel market, but it often creates confusion during procurement. The reason is simple: ASTM A479 is a bar and shape specification, not a plate specification.
When engineers search for "A479 S32760", they are often looking for the material grade UNS S32760 (Zeron 100) but require it in plate form for fabrication, pressure equipment, or offshore applications.
Teda Ganghua supplies super duplex stainless steel products including UNS S32760 materials with specification verification, MTR documentation, customized processing, and global export support.
Explore Teda Ganghua Super Duplex Stainless Steel Solutions
1. What Does ASTM A479 S32760 Mean?
The designation contains two different pieces of information:
| Designation | Meaning |
|---|---|
| ASTM A479 | Specification for stainless steel and heat-resisting steel bars and shapes |
| S32760 | UNS designation for super duplex stainless steel (Zeron 100) |
Therefore:
ASTM A479 S32760 = UNS S32760 super duplex stainless steel supplied as bar or shape products.
It does not directly describe a stainless steel plate product.
2. ASTM A479 Is Not a Plate Standard
One of the most common purchasing mistakes is specifying the wrong ASTM standard for the product form.
| ASTM Standard | Product Form | Typical Application |
|---|---|---|
| A479 | Bars and shapes | Shafts, valve stems, machined components |
| A240 | Plate, sheet, strip | Pressure equipment, fabrication, tanks |
| A480 | General requirements | Dimensions, tolerances, finish requirements |
| A923 | Duplex corrosion testing | Detection of harmful intermetallic phases |
For S32760 plate applications, the correct specification is usually:
ASTM A240 UNS S32760 Plate + ASTM A923 testing requirements when required.
3. Why Do Buyers Search "A479 S32760" for Plate?
There are several common reasons why this specification appears in plate inquiries.
Situation 1: Engineering Drawing Uses A479 Incorrectly
Some project drawings reference ASTM A479 because the original component was a bar product. Later, the fabrication team needs plate material for welding or forming.
In this case, the material grade is correct, but the product standard needs to change:
Wrong: ASTM A479 S32760 Plate
Correct: ASTM A240 S32760 Plate
Situation 2: Plate Cut from Large Bar Stock
For small dimensions or thick sections, some suppliers may saw-cut material from large diameter S32760 bar.
This method can work for special parts, but it has limitations:
- Restricted dimensions.
- Higher material cost.
- Limited surface finish options.
- Not suitable for large welded plate fabrication.
4. UNS S32760 (Zeron 100) Super Duplex Stainless Steel Overview
UNS S32760, commonly known as Zeron 100, is a super duplex stainless steel developed for extremely aggressive corrosion environments.
Its duplex microstructure contains approximately:
- 50% austenite.
- 50% ferrite.
This structure provides:
- Higher strength than 300 series stainless steels.
- Excellent chloride corrosion resistance.
- Superior stress corrosion cracking resistance.
- High resistance to pitting and crevice corrosion.
5. Chemical Composition Characteristics of S32760
| Element | Typical Content | Purpose |
|---|---|---|
| Chromium (Cr) | ≈ 24-26% | Corrosion resistance |
| Nickel (Ni) | ≈ 6-8% | Austenite stabilization |
| Molybdenum (Mo) | ≈ 3-4% | Pitting resistance |
| Tungsten (W) | ≈ 0.5-1.0% | Improves corrosion resistance |
| Copper (Cu) | ≈ 0.5-1.0% | Improves acid resistance |
| Nitrogen (N) | ≈ 0.2-0.3% | Strength and PREN improvement |
The addition of tungsten and copper differentiates S32760 from many other duplex stainless steels and improves performance in acidic chloride environments.
6. PREN Performance: Why S32760 Is a Super Duplex Grade
The Pitting Resistance Equivalent Number (PREN) is commonly used to compare stainless steel resistance against chloride pitting.
| Grade | Approximate PREN Level | Classification |
|---|---|---|
| S32205 / 2205 | ≈ 34 | Duplex stainless steel |
| S32750 / 2507 | ≥ 40 | Super duplex |
| S32760 / Zeron 100 | ≥ 40 | Super duplex with W and Cu additions |
7. S32760 vs 2507 vs 2205 Comparison
| Grade | Strength | Corrosion Resistance | Typical Use |
|---|---|---|---|
| 2205 | High | Excellent | Chemical equipment, marine structures |
| 2507 | Very High | Superior | Offshore oil and gas |
| S32760 | Very High | Extreme chloride and acid resistance | Critical offshore and chemical applications |
8. Correct Way to Order S32760 Plate
For plate procurement, the specification should clearly identify:
- Material grade: UNS S32760.
- Product form: Plate.
- Standard: ASTM A240.
- Supplementary testing: ASTM A923 if required.
- Offshore certification: NORSOK M-650 when required.
- Material certificate: EN 10204 3.1 or 3.2.
A typical purchase description:
ASTM A240 UNS S32760 Super Duplex Stainless Steel Plate, solution annealed, with MTR certification.
9. Typical Applications of S32760 Plate
| Industry | Applications |
|---|---|
| Offshore Oil & Gas | Subsea equipment, piping systems, valves |
| Marine Engineering | Seawater systems and desalination equipment |
| Chemical Processing | Acid-resistant equipment and pressure vessels |
| Energy Industry | Heat exchangers and corrosion-resistant components |
10. Teda Ganghua S32760 Stainless Steel Supply Capability
Teda Ganghua supports customers sourcing high-performance duplex and super duplex stainless steel products with:
- UNS S32760 material verification.
- ASTM specification confirmation.
- MTR documentation.
- Custom cutting and fabrication support.
- Project-based sourcing for special alloys.
- Export packaging and global shipment experience.
For customers searching "A479 S32760" but requiring plate material, our technical team can help confirm the correct specification and recommend the right product form.
Request UNS S32760 Super Duplex Stainless Steel Quote
Frequently Asked Questions
Is ASTM A479 S32760 the same as S32760 plate?
The material grade is the same, but ASTM A479 applies to bars and shapes, while plate products normally follow ASTM A240.
What standard should be used for S32760 plate?
The common specification is ASTM A240 UNS S32760 with additional testing requirements depending on project needs.
Does S32760 require special certification for offshore projects?
Many offshore projects require NORSOK M-650 qualification and additional traceability documentation.
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