1.4439, AISI 317LMN - Stainless Steel
Stainless acid resistant steel 1.4439, AISI 317LMN, UNS S31726 with austenitic structure resistant to intergranular corrosion according to EN 10088-1.
| Standards | Steel Grades | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | N: | |
| EN | 1.4439 - X2CrNiMoN17-13-5 - X 2 CrNiMoN 17-13-5 | ||||||||
| <0.03 | <2.0 | <1.0 | <0.045 | <0.015 | 16.5 - 18.5 | 12.5 - 14.5 | 4.0 - 5.0 | 0.12 - 0.22 | |
| EN | 1.4434 - X2CrNiMoN18-12-4 - X 2 CrNiMoN 18-12-4 | ||||||||
| <0.03 | <2.0 | <1.0 | <0.045 | <0.015 | 16.5 - 19.5 | 10.5 - 15.0 | 3.0 - 4.0 | 0.1 - 0.2 | |
| ASTM | UNS S31726 - AISI 317LMN | ||||||||
| <0.03 | <2.0 | <1.0 | <0.045 | <0.030 | 17.0 - 20.0 | 13.5 - 17.5 | 4.0 - 5.0 | 0.1 - 0.2 | |
| AFNOR | Z3CND18-14-05Az - Z 3 CND 18-14-05 Az | ||||||||
| <0.03 | <2.0 | <0.75 | <0.035 | <0.010 | 17.0 - 19.0 | 13.0 - 15.0 | 4.0 - 5.0 | 0.12 - 0.20 | |
1.4439, X2CrNiMoN17-13-5, AISI 317LMN - specification and destination
Type 1.4439 is a derivative and better austenitic variant of the 316 and 317 steel grades, having higher Nickel, Molybdenum and Nitrogen content, which significantly increases the product's resistance to pitting and crevice corrosion in Cl environments.
Stal finds its application in the chemical, energy, cryogenic, petrochemical, pulp and paper industries as well as in food contact with chlorides and the effects of high temperatures.
It shows a better yield point up to 400 ℃ compared to 1.4438, 1.4436, 1.4435 and 1.4432.
It is used for the production of special pumps, installations, radiators, apparatus, heat exchangers or tanks for chemicals - sulfuric, formic, nitric, acetic or sodium hydroxide in the form of bars, forgings, sheets and pipes.
The process of heat treatment - supersaturation is carried out at 1020 - 1120 ℃
Mechanical and physical properties of 1.4439, X2CrNiMoN17-13-5:
- Tensile strength, Rm: 580 - 800 MPa
- Yield point, Rp0,2: >280 MPa
- Elongation, A: >35%
- Impact resistance, KV20℃: >100 J
- Hardness: <250 HB
- Heat conductivity, λ: 14 W * m-1 * K-1
- Heat capacity, cp20℃: 500 J * kg-1 * K-1
- Modulus of elasticity, E: 200 GPa
- Specific resistance, Ω: 0.85 mkOhm * m
Mechanical properties at elevated temperatures
- Yield point, Rp0,2
- temp. 100℃ = >225 MPa
- temp. 200℃ = >185 MPa
- temp. 300℃ = >165 MPa
- temp. 400℃ = >150 MPa
- Linear Expansion Factor, α
- temp. 100℃ = 16,0 x 10-6 K-1
- temp. 200℃ = 16,5 x 10-6 K-1
- temp. 300℃ = 17,0 x 10-6 K-1
- temp. 400℃ = 17,5 x 10-6 K-1
- temp. 500℃ = 18,0 x 10-6 K-1
- Modulus of elasticity, E
- temp. 100℃ = 194 GPa
- temp. 200℃ = 186 GPa
- temp. 300℃ = 179 GPa
- temp. 400℃ = 172 GPa
- temp. 500℃ = 165 GPa
Substitutes, equivalents and other species designations
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