SS Sheet EN1.4404 >12MM
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. 1.4404 has low carbon content which means that it can be welded without risking impairment of corrosion resistance in the vicinity of the weld. In terms of strength, 1.4404 is more or less equivalent to the lower alloyed grades 1.4301/1.4307.
Flat formats of 1.4301/1.4307 are standardised in EN 10088-2. This standard covers hot-finished plate with thicknesses up to and including 75 mm.
The presence of molybdenum along with chromium renders 1.4404 resistant to corrosion in weak acids and water containing chlorides so long as the chloride concentration is not too high; an example of an environment where the steel works well is salt-laden coastal atmosphere. The material is also a regular choice for equipment in the pulp and paper industry, chemical plants and energy production.
The formability, e.g. by bending or roll forming, of hot-finished plate in 1.4404 is very good, often equivalent to that for hot-rolled plate in carbon steel. The steel is also characterised by very good weldability and seldom poses any problems in fabrication of welded structures. However, machining (milling, drilling) of plate in 1.4404 can be troublesome but processing is facilitated by making use of tooling specifically designed for machining stainless steel.
The surface finish of 1.4404 plate as stocked is 1D (annealed and with surface oxide removed by pickling).