EN 1.4429 (AISI 316LN / X2CrNiMoN17-13-3) is a low-carbon, nitrogen-alloyed austenitic stainless steel developed for applications where standard 316L is strong enough in terms of corrosion resistance, but not always in terms of mechanical strength. The controlled low carbon level supports weldability and helps reduce the risk of sensitization, while nitrogen increases yield and tensile strength and can improve pitting resistance.
In practice, 316LN is frequently specified for pressure equipment and structural parts that combine chloride exposure with higher design stresses. Typical examples include piping systems, flanges and fittings, offshore structures, and machined components where a higher proof strength can reduce wall thickness or improve safety margins. Final properties depend on product form and supply condition (typically solution annealed) and are confirmed by EN 10204 / 3.1 certification.
| Element | Typical range (wt. %) |
|---|---|
| C | ≤ 0.03 |
| Si | ≤ 1.00 |
| Mn | ≤ 2.00 |
| P | ≤ 0.045 |
| S | ≤ 0.015 |
| Cr | 16.5 – 18.5 |
| Ni | 10.0 – 13.0 |
| Mo | 2.0 – 2.5 |
| N | 0.10 – 0.16 |
| Fe | Balance |
| Property | Typical value (solution annealed) |
|---|---|
| Tensile strength (Rm) | ≥ 580 MPa |
| Yield strength (Rp0.2) | ≥ 290 MPa |
| Elongation (A5) | ≥ 35 % |
| Hardness | ≤ 220 HB |
| Impact toughness | per standard / see EN 10204 3.1 certificate |
Exact values are stated on the material certificate EN 10204 / 3.1.
1.4429 / 316LN is supplied in several product forms, including round bar, plate/sheet and tube, as well as machined blocks. It is commonly delivered in solution annealed condition to achieve the required corrosion resistance and toughness.
Availability (stock & project supply): round steel 6 – 242 mm and blocks (other forms and dimensions available on request, depending on specification).
Round bar range: 6 – 242 mm
Blocks: available (sizes on request)
Centerless grinding available on request. This is often specified for precision shafts and components requiring tight diameter tolerances, improved straightness and a controlled surface finish.
Nitrogen increases yield and tensile strength without significantly reducing ductility, which is one of the reasons 316LN is used for structural and pressure applications. In many chloride-containing environments, nitrogen can also improve resistance to localized corrosion. The exact benefit depends on the final chemistry, surface condition and operating environment.
Yes. The low-carbon content supports weldability and helps reduce the risk of sensitization compared to higher-carbon stainless steels. Good welding practice is still essential: correct heat input, suitable filler, proper cleaning and (where required) pickling/passivation. Requirements should follow the relevant welding standard or project code.
1.4429 (316LN) generally provides higher proof strength than 316L while maintaining similar “316-type” corrosion resistance. That can be useful when designs are strength-driven (e.g., pressure ratings or structural loads). Availability and pricing can differ by product form, and the final choice should be made based on both corrosion mechanism and design code.
Yes. 1.4429 / 316LN is available as round steel and blocks, making it suitable for machining turned or milled components. For this grade, round bar is commonly supplied in a wide diameter range, and blocks can be provided for parts that require larger cross sections or specific machining strategies.
Yes. Material is supplied with EN 10204 / 3.1 certification. The certificate documents heat/lot traceability and includes chemical analysis and mechanical test results for the delivered condition. For pressure equipment projects, the certificate is an important part of compliance documentation.
Yes. Centerless ground bar can be supplied on request when tight diameter tolerances, improved straightness and consistent surface finish are required. Provide the target diameter, tolerance class, straightness, surface roughness and delivery length at quotation stage.
Certificates: EN 10204 / 3.1
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