Austenitic stainless
1.4438
TP 317L
X2CrNiMo18-15-4
317L — higher molybdenum and nickel than 316L for stronger resistance to chlorides and acids; weld-stable.
Chemical composition
mass %| Element | Content |
|---|---|
| CCarbon | ≤0.03 |
| SiSilicon | ≤1 |
| MnManganese | ≤2 |
| PPhosphorus | ≤0.045 |
| SSulphur | ≤0.015 |
| NNitrogen | ≤0.11 |
| CrChromium | 17.5–19.5 |
| MoMolybdenum | 3–4 |
| NiNickel | 13–16 |
Mechanical properties
room temperature- Rp0.2 min (N/mm²)
- 220
- Rp1.0 min (N/mm²)
- 250
- Rm (N/mm²)
- 460–690
- Elongation A% (longitudinal)
- 35
- Elongation A% (transverse)
- 30
- Impact energy KV J (longitudinal)
- 100
- Impact energy KV J (transverse)
- 60
Seamless tube.
Standard equivalences
- DIN/EN
- X2CrNiMo18-15-4
- AISI
- 317L
- UNS
- S31703
- SS
- 2367
- AFNOR
- Z3 CND 19.15.04
- BS
- 317 S12
Typical applications
- Power-plant condensers
- Chemical tankers
- Pulp and textile finishing
- Marine technology
Frequently asked questions
What is 1.4438 (TP 317L)?
1.4438 (X2CrNiMo18-15-4) — Austenitic stainless. 317L — higher molybdenum and nickel than 316L for stronger resistance to chlorides and acids; weld-stable.
Which grades are equivalent to 1.4438?
1.4438 corresponds to EN X2CrNiMo18-15-4; equivalent designations: AISI 317L, UNS S31703, SS 2367, AFNOR Z3 CND 19.15.04, BS 317 S12.
Related grades
Indicative values — verify against the applicable standard before specifying.
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