1.4404 (X2CrNiMo17-12-2) Material Data Sheet

1.4404 is a low-carbon, austenitic chromium-nickel-molybdenum steel. Due to the addition of 2 - 2.5% molybdenum, the corrosion resistance of the 1.4404 is significantly better than that of the standard austenitic grades 1.4301 and 1.4307. 

The material 1.4404 is resistant to intercrystalline corrosion when welded! but not resistant to sea water. Best corrosion resistance is given with a polished surface. This material is comparable to 1.4401.

If a low delta ferrite content is desired, material 1.4435 can be used.

1.4404 is also known under the classification AISI 316L.

Application areas

It is mainly used in the automotive industry, chemical industry, construction industry, petroleum industry, petrochemical industry, engineering, decorative and kitchen equipment, food industry, aviation, electronic equipment and medical and pharmaceutical industries.

The material grade 1.4404 has special properties, for example: Polishing, is suitable for low temperatures, in continuous operation up to 300°C resistant to intergranular corrosion and suitable for use at temperatures up to 550°C.

Heat treatment
 

Forging: In the forging process, a slow heating to about 1150°C - 1180°C takes place, in order to forge in a temperature range of 900°C - 1180°C. Subsequently, an air or water cooling takes place. The corrosion resistance is reduced by scale or tarnish.

Welding: The 1.4404 is weldable with and without welding additive. In this case, an interpass temperature of 200°C should not be exceeded. A subsequent heat treatment is not required. The heat input during welding does not affect the resistance to intergranular corrosion.

Cold forming: The material 1.4404 is suitable for cold massive forming.

Corrosion resistance: Due to the low carbon content, the material 1.4404 is resistant to intercrystalline corrosion but not sea water resistant. In natural environmental media and moderate concentrations of chlorine and salt, this grade of material has excellent corrosion resistance.

Processing:

Physical Properties:

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The processing with the saw is a mechanical processing of the material, which results in a significantly lower unintended deformation and increased hardness for the existing structure, such as the thermal cutting.

Thus, the machined workpiece has a homogeneous structure even at the edge, which does not change in the continuation of the material.
This circumstance allows immediate finishing of the workpiece with milling or drilling . So it is not necessary to anneal the material or make a similar operation beforehand.