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Cold-rolled stainless-steel sheet is used in many applications in which the material is required to fulfil a decorative or hygienic function (or both). The austenitic steel with designation 1.4404 contains molybdenum in addition to chromium and nickel. The difference against 1.4301/1.4307 apart from the presence of molybdenum is that the nickel content is greater. This type of stainless steel is often referred to as acid resistant which is to some degree a misnomer since the material resists attack only by weak acids. In terms of strength, 1.4404 is more or less equivalent to the lower alloyed grades 1.4301/1.4307. Cold-rolled and surface-treated sheet of this material finds use in applications demanding aesthetic appeal combined with better corrosion resistance than can be offered by 1.4016 or 1.4301/1.4307.
Flat formats of 1.4404 are standardised in EN 10088-2. This standard covers cold-finished thicknesses up to and including 8 mm.
The formability of cold-finished sheets of 1.4404 is in most cold-forming operations excellent and often equivalent to that of cold-rolled carbon steel. In addition, weldability is very good and there are seldom any issues in fabrication of welded structures.
Tibnor’s stock programme encompasses cold-rolled sheet in grade 1.4404 with surface finish designated DP20 which is a ground finish with a high level of smoothness (low Ra). The sensitive surfaces of stainless-steel sheet which has been treated as described are usually protected by plastic in the form of sheet or film.