UNS S32550 coil (ASTM A789/A790) is engineered where high chloride exposure meets significant mechanical stress. Its optimized chemistry, including copper, provides exceptional resistance to stress corrosion cracking-a key advantage over other duplex grades in offshore and chemical processing applications.
The alloy delivers high strength (approximately double the yield strength of 304/316 stainless), enabling lighter, more efficient designs for pressure systems and structural components. Supplied in coil for production continuity, it is produced under controlled thermal processing to ensure consistent, reliable phase balance and performance.
Product Details
Specifications & Technical Parameters
| Category | Parameter | Detail / Typical Value |
| Standards | ASTM / ASME | A789 / A790, A240 |
| UNS | S32550 | |
| EN / Common Name | 1.4507 / Alloy 255 | |
| Coil Dimensions (Standard Range) | Thickness | 0.5 mm - 6.0 mm |
| Width | 600 mm - 2000 mm (Slitting Available) | |
| Coil Weight (Approx.) | Up to 15 Metric Tons (MT) | |
| Inner Diameter (ID) | 508 mm (20") or 610 mm (24") | |
| Mechanical Properties | Yield Strength (0.2% Offset) | ≥ 550 MPa (min) |
| Tensile Strength | ≥ 760 MPa (min) | |
| Elongation | ≥ 15 % (min) | |
| Hardness (Rockwell C) | Typically 28 - 32 HRC |
Typical chemical composition(wt%)
| Element | Content (%) |
| Chromium (Cr) | 24.0 - 27.0 |
| Nickel (Ni) | 4.5 - 6.5 |
| Molybdenum (Mo) | 2.9 - 3.9 |
| Nitrogen (N) | 0.10 - 0.25 |
| Copper (Cu) | 1.5 - 2.5 |
| Iron (Fe) | Balance |
Features and Advantages
- Outstanding Strength-to-Weight Advantage
S32550 offers excellent yield strength, enabling direct engineering weight reduction. In applications, this typically means that material volume can be reduced by 15%-25% at the same pressure rating, thereby lowering procurement costs and simplifying logistics.
- Good Fabrication Characteristics
Excellent formability characteristics. The alloy exhibits consistent formability under controlled processing conditions. Supplied in sheet form, it is well-suited for continuous roll forming and progressive stamping processes.
- Superior Corrosion and Stress Crack Resistance
The S32550 coil has a PREN of 38+, so it's super resistant to pitting and crevice corrosion. It also really helps prevent chloride stress corrosion cracking. Basically, it lasts a lot longer in harsh stuff like warm seawater, yucky water, and really strong chemical liquids.
Our Strength
At Jiangsu CunRui Metal Products Co., Ltd., we don't just sell metal; we make buying it super easy for industrial folks like you.
Take our S32550 duplex stainless steel coil, for example. We handle all the shipping like pros to make sure it gets there right when you need it for production.
We sort out all the export paperwork and can work with your supply chain using different Incoterms.
Our team keeps you in the loop on your order and is always ready to chat with your receiving and quality control people.
Applications
Service & Support
01
Protective Packaging
Custom wrappings (such as VCI paper or heavy-duty plastic) and edge protection to prevent corrosion and damage during transit and storage.
02
Precision Slitting
Accurate slitting to narrow strip widths according to your drawings, with regulated tolerances for edge condition and camber.
03
Heat Number Management
On request, we can consolidate or separate batches by melt heat number to help your quality control and traceability standards.
04
Pre-Shipment Inspection
Arrange for independent third-party inspection (dimensional, visual, PMI) at the mill or warehouse prior to shipment, based on your specifications.
FAQ
Q: What is S32550 best suited for?
A: It is intended for high-strength, load-bearing components exposed to seawater or chloride-rich process streams, where typical materials are prone to stress corrosion cracking.
Q: Why does S32550 contain copper?
A: The copper addition improves its resistance to some acids, like as sulfuric acid, and increases overall strength.
Q: What is the maximum continuous service temperature?
A: Continuous usage in air is typically safe up to 300°C (572°F).
Q: What more product types are available?
A: It is also usually available as pipe, tube, bar, and plate to match project components.
Q: What testing is advised after fabrication?
A: For critical welds and parts, Liquid Penetrant (PT) or Radiographic Testing (RT) is recommended to ensure weld integrity and detect surface/sub-surface flaws.
Hot Tags: s32550 duplex stainless steel coil, China s32550 duplex stainless steel coil manufacturers, factory, 2205 Duplex Stainless Steel Coil, S32750 Super Duplex Stainless Steel Coil, S31803 Duplex Stainless Steel Coil, 2101 Duplex Stainless Steel Coil, duplex steel coil, 2507 Duplex Stainless Steel Coil
