Stainless steel austenitic stainless steel stabilized with titanium
The material 1.4541321/321H is a stainless steel, austenitic chromium-nickel steel, which has excellent resistance to aggressive media. Due to the balanced proportion of chromium and nickel, the steel has an austenitic structure. It shows good resistance to oxidation in the air up to about 900 °C, in operation in carbon dioxide up to 650 °C.
1.4541 has a high resistance to:
- organic acids at a high concentration and moderate temperatures,
- inorganic acids, e.g. boric and phosphoric acid as well as,
- sulphurous acid at moderate concentrations and temperatures,
- salts, e.g. sulphates, sulphides and sulphites.
- 1.4541 should not be used in sulphuric acid or hydrochloric acid.
1.4541/321/321H in use
Chrome-nickel steel can be worked with well
in all welding processes – the only exception being gas welding. Due to the titanium alloy, a thermal aftertreatment is generally not necessary after welding. After welding and any other heat treatment with oxidation, adherent oxides should be removed.
When machining, it is important to ensure that this is only done with adequate cooling and with a suitable hard metal tool. Due to its austenitic structure, this material has a tendency to cold-hardening; besides, it has poor thermal conductivity.
Assignment to current and older standards
- Designation according to DIN: X 6 Cr Ni Ti 18-10
- ASTM grade: 321 / 321H
- EN: 1.4541
- ASME: 321/321H
- AFNOR: X6CrNiTi 18-10
- DIN: 1.4541
- SIS: 2337
- UNS: S32100
Chemical composition reference analysis (as weight %)
|Cr||17 – 19|
|Ni||9 – 12|
Mechanical values at room temperature
|Tensile strength N/mm²||500 – 730|
|Tensile yield point Rp 0,2 N/mm²||≥ 180|
|Elongation at break A5 %||35|