Stainless steel / UNS S41003
1.4003 (X2CrNi12) is a 12% chromium utility ferritic stainless steel designed to replace coated carbon steel in wet, abrasive and mildly corrosive structural duty.
- UNS S41003
- W.Nr. 1.4003
- Spec EN 10088-2
- Density 7.7 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | S41003 |
| W.Nr. | 1.4003 |
| EN | X2CrNi12 |
| Also known as | 1.4003, 3CR12, S41003 |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| C | — | 0.030 |
| Si | — | 1.00 |
| Mn | — | 1.50 |
| P | — | 0.040 |
| S | — | 0.015 |
| Cr | 10.5 | 12.5 |
| Ni | 0.30 | 1.00 |
| N | — | 0.030 |
| Fe | Bal. | — |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (min) | 450 MPa (65.3 ksi) |
| Yield strength, 0.2% offset (min) | 280 MPa (40.6 ksi) |
| Elongation in 50 mm (min) | 20 % |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.7 g/cm³ | 0.278 lb/in³ |
| Magnetic response | Magnetic | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Sheets, plates & coils | ASTM A240 / ASME SA240 | 0.3 mm – 6 mm |
| Seamless & welded pipe | ASTM A312 / ASME SA312 | 1/8" – 24" NB |
| Tubes | ASTM A213, A249, A269 | 1/8" – 24" NB |
| Bars & rods | ASTM A276, A479 | 3 mm – 500 mm |
| Flanges & forgings | ASTM A182 / ASME SA182 | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM A403 / ASME SA403 | 1/2" – 48" NB |
| Fasteners | ASTM A193 / A194, F593 / F594 | M3 – M56 |
Corrosion & temperature resistance
Corrosion resistance rises with chromium, molybdenum and nitrogen: 304 handles general atmospheric and food-contact service, 316/317 add resistance to chlorides and pitting, 904L handles strong reducing acids, and stabilised 321/347 resist intergranular attack after welding or high-temperature exposure.
Applications
X2CrNi12 (1.4003): Wagons, hoppers, conveyors, structures. Process piping, tanks and vessels, heat exchangers, food, dairy and pharmaceutical equipment, architectural work and general engineering.
Frequently asked questions
What is the UNS number of X2CrNi12 (1.4003)?
X2CrNi12 (1.4003) is designated UNS S41003 (W.Nr. 1.4003, EN X2CrNi12).
What is X2CrNi12 (1.4003) used for?
Utility ferritic, weldable. Typical uses: wagons, hoppers, conveyors, structures.
Is X2CrNi12 (1.4003) magnetic?
Magnetic.
In which forms can I buy X2CrNi12 (1.4003) from Rajkamal Metals?
Coils & Strips, Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Structural Sections, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Ferrule / Instrumentation Fittings, Dairy Fittings, Dish Ends, SS Tanks, Custom Orders. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with X2CrNi12 (1.4003)?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
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