Overview
316LN stainless is a nitrogen-strengthened version of Type 316L stainless. By means of solid solution strengthening, the nitrogen provides significantly higher yield and tensile strength as annealed than Type 316L without adversely affecting ductility, corrosion resistance or non-magnetic properties. In the hot rolled unannealed condition, yield strengths of 75 ksi (518 MPa)or higher can be achieved for bar diameters up to 1.375in (34.925 mm).
316LN stainless has good resistance to atmospheric corrosion and long-term resistance to general corrosion when embedded in concrete. In the 15 week corrosion macrocell test in simulated concrete pore solution, 316LN stainless had an average corrosion rate less than 0.25 micro-meter/yr.
In general, the corrosion resistance of 316LN stainless is similar to Type 316L. The higher nitrogen content enhances chloride pitting and crevice corrosion resistance. 316LN withstands not only ordinary rusting but also most of the organic and inorganic chemicals. It resists corrosion by nitric acid and sulfurous acid compounds. 316LN has good intergranular corrosion in the as-annealed and as-welded conditions due to its low carbon content. Some intergranular attack may occur in the hot rolled unannealed condition.
Specification
ASTM A213/A213M-21a Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes.
| Specifications | ASTM A213 / ASME SA213 |
| Dimensions | ASTM, ASME and API |
| Range | 1/2"OD - 12"OD |
| Outside Diameter | 3.00 mm - 219.10 mm, 6.35 mm O.D to 114.3 mm O.D |
| Length | Single Random, Double Random & Required Length |
| Thickness | 0.40 mm - 12.70 mm, 0.8 mm to12.7 mm |
| Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH120, SCH140, SCH160, XXS |
| Type | Seamless |
| Form | Round Tube, Square Tube, Rectangular Tube |
| End | Plain End, Beveled End, Treaded |
ASTM A213 SS 316LN Equivalent:
| STANDARD | WERKSTOFF NR. | UNS | EN |
| SS 316LN | 1.4429 | S31653 | X2CrNiMoN17-13-3 |
Chemical Composition
| ELEMENT | CONTENT (%) |
|---|---|
| Iron, Fe | Balance |
| Chromium, Cr | 16.0-18.0 |
| Nickel, Ni | 10.0-14.0 |
| Molybdenum, Mo | 2.0-3.0 |
| Manganese, Mn | 2.00 |
| Silicon, Si | 1.00 |
| Nitrogen, N | 0.10-0.30 |
| Phosphorous, P | 0.045 |
| Carbon, C | 0.03 |
| Sulfur, S | 0.03 |
Mechanical Properties
| PROPERTIES | METRIC | IMPERIAL |
|---|---|---|
| Tensile strength | 515 MPa | 74694 psi |
| Yield strength | 205 MPa | 29732 psi |
| Modulus of elasticity | 190-210 GPa | 27557-30457 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 60% | 60% |
Physical Properties
| Specific Heat (0-100°C) | 485 | J.kg-1.°K-1 |
| Thermal Conductivity | 16.3 | W.m -1.°K-1 |
| Thermal Expansion | 16.5 | mm/m/°C |
| Modulus Elasticity | 200 | GPa |
| Electrical Resistivity | 7.4 | μohm/cm |
| Density | 7.99 | g/cm3 |
Applications
- 1. Orthopaedic implants
- 2. Trauma nails
- 3. Neurological applications
- 4. Surgical instruments
