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Special Stainless Steels – Engineered for Extreme Environments
We supply premium special-grade stainless steels designed to perform in highly corrosive, high-pressure, high-temperature, or magnetic-sensitive environments.
What Is Special Stainless Steel?
Special stainless steels are a group of enhanced performance alloys that go beyond standard grades like 304/316. They are tailored for:
Extreme corrosion environments (acid, chloride, sulfur)
High temperature service
Anti-sulfide stress corrosion (SSC)
Non-magnetic & controlled magnetic permeability
Oil & gas sour service (H2S, CO₂ exposure)
These grades often come with higher alloy content (Ni, Mo, N, Cu) and stringent mechanical property control.
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Optional product specifications
| Grade | Main Feature | Typical Use |
|---|---|---|
| 904L | High Ni & Mo for acid corrosion | Chemical tanks, acid lines |
| 254SMO | Super austenitic, high pitting resistance | Offshore, desalination |
| 309S / 310S | High temperature oxidation resistance | Heat exchangers, kilns |
| 2205 / 2507 | Duplex & super duplex stainless | Oil & gas, marine piping |
| UNS N08904 | Copper-added for sulfuric acid resistance | Fertilizer plants |
| 00Cr20Ni18Mo6CuN (Ultra 904L) | Extreme chloride + acid corrosion | Petrochemical towers |
| UNS S31254 (254SMO) | Excellent pitting resistance (PRE > 42) | Seawater systems |
| 1Cr18Ni9Ti / 321 | Good weldability + thermal fatigue | Food processing & piping |
| Non-Magnetic 316L | Low magnetic permeability for medical / instruments | MRI, electronic enclosures |
| Sulfur-Resistant Steel | Designed for SSC per NACE | Oil drilling, pipelines |
* Delivery: Plate, sheet, pipe, bar, tube, fittings, flanges, forgings
Spec: ASTM A240 / A312 / A182 / EN 1.4539 / N08904 / S32205 / S32750
Processing & Packaging
Precision shearing & CNC machining
Polishing: 2B / BA / No.4 / HL / Mirror
Ultrasonic (UT), PMI, mechanical tests
Oil-coated, vacuum-packed or crate export packaging
Marking: Heat number + batch + grade + QR code (optional)
Why Buy From Xishang?
- Over 20 special stainless steel grades in stock
- Full documentation (EN10204 3.1, NACE MR0175, PMI, UT)
- Welding & corrosion resistance consultation
- Slitting, cutting, machining & polishing services
- Fast delivery + small MOQ
- Support for EPC, OEM and MRO projects
Frequently Asked Questions
Q1: What’s the difference between 904L and 316L?
A:
904L has much higher nickel (25%) and molybdenum (4.5%) content, offering better resistance to strong acids like H₂SO₄.
Q2: Is 254SMO better than duplex stainless steel?
A:
For chloride pitting and crevice corrosion, yes. 254SMO (PRE > 42) outperforms 2205 duplex in seawater resistance.
Q3: Do you offer NACE-certified materials for oil & gas?
A:
Yes. All relevant grades can be supplied per NACE MR0175 / ISO 15156 with full traceability and test reports.
Q4: Can you supply non-magnetic stainless with guaranteed permeability?
A:
Yes. We offer low magnetic permeability stainless (<1.005 μr) for sensitive equipment.
Q5: What’s your lead time and MOQ?
A:
Stock items: 3–5 days. MOQ from 50–100kg depending on shape/grade.
Let us know your required grade
Whether you're handling sulfuric acid, designing offshore platforms, or building non-magnetic instruments, Xishang delivers performance-grade stainless steels tailored to your needs.
