- Grade / Alloy
- 316L / 316LMo
- EN / W.Nr.
- 1.4435X2CrNiMo18-14-3
- AISI / SAE
- 316L
- UNS
- S31603
- Other names
- 316LMo
- Family
- Austenitic
Chemical composition
Chemical composition
Composition limitsComposition limits for long products within EN 10088-3:2014.
| Element | Content (% by mass) |
|---|---|
| CCarbon | ≤ 0.03 |
| SiSilicon | ≤ 1 |
| MnManganese | ≤ 2 |
| PPhosphorus | ≤ 0.045 |
| SSulfur | ≤ 0.03 |
| NNitrogen | ≤ 0.1 |
| CrChromium | 17–19 |
| NiNickel | 12.5–15 |
| MoMolybdenum | 2.5–3 |
Values describe the grade, not the analysis of a specific batch. The applicable product specification and material certificate determine acceptance. A dash does not mean zero.
Properties of 1.4435 stainless steel
Within the familiar 316L family, 1.4435 has a higher alloy content. It retains a low carbon limit while minimum nickel rises to 12.5% and minimum molybdenum to 2.5%. Molybdenum contributes to resistance against localised corrosion in chloride-bearing environments, while nickel supports a stable austenitic structure. This composition is useful in process-contact components where surface quality also matters.
Use in process equipment
Valve bodies, connections, heat-exchanger components and hygienic equipment are among its applications. Bar, sheet and tube provide starting forms for different parts. Low carbon is useful in welded equipment, although surface cleanliness and the service environment also affect corrosion behaviour. Higher molybdenum does not make 1.4435 resistant to seawater at every temperature.
Is it the same grade as 1.4404?
Both 1.4404 and 1.4435 can appear under the names 316L and S31603, but their EN composition limits differ. The nickel and molybdenum ranges are higher in 1.4435; the shared 316L name does not make the two European designations interchangeable. Nor is 1.4435 identical to implant steel 1.4441. Additional requirements for a low-ferrite or specially clean producer version do not apply automatically to every 1.4435 product.
Mechanical properties of solution-annealed long products
The following range applies to the stated +AT long-product conditions and sections up to 160 mm under EN 10088-3:2014. Bright bar and cold-worked products may have different values. Elongation refers to longitudinal testing.
| Property | Value |
|---|---|
| Tensile strength Rm | 500–700 MPa |
| Proof strength Rp0.2 | ≥ 200 MPa |
| Elongation A | ≥ 40% |
Typical application areas
Chemical and pharmaceutical equipment, valve parts, food processing.
Product and cutting options
Relevant product forms for this material are listed below. Availability varies with grade and dimensions.