904 is a corrosion resistant austenitic stainless steel.

Austenitic stainless steel production process performance is good, especially chromium-nickel austenitic stainless steel, the production of special steel by conventional means can smoothly produce a variety of commonly used specifications of plate, tube, tape, wire, bar and forgings and castings. Because of the high content of alloying elements (especially chromium) and low carbon content, electric arc furnace plus argon oxygen decarburization (AOD) or vacuum deoxidation decarburization (VOD) method is used to produce this kind of stainless steel in large quantities. For small batch products of high grade, vacuum or non-vacuum non-induction furnace smelting can be used, and electroslag remelting can be added if necessary.

The excellent thermoplastic properties of chrome-nickel austenitic stainless steel make it easy to be wrought, rolled, hot perforated and extruded. The heating temperature of steel ingot is 1150~1260℃, and the deformation temperature range is generally 900~1150℃. The steels containing copper, nitrogen and titanium and niobium stabilized tend to be low temperature, while the high chromium and molybdenum steels tend to be high temperature. Due to poor thermal conductivity, the insulation time should be longer. After hot processing, the workpiece can be air cooled. Chromiumanese austenitic stainless steel is sensitive to hot crack, so the ingot should have small deformation and many passes during opening, and the forgings should be piled cold. It can be used for cold rolling, cold drawing and spinning, as well as stamping, bending, edging and folding. Chrome-nickel austenitic stainless steel has weaker work hardening tendency than chrome-manganese steel, and the cold deformation can reach 70%~90% after annealing. However, chrome-manganese austenitic stainless steel should increase the intermediate softening annealing times due to its large deformation resistance and strong work hardening tendency. Generally, intermediate softening annealing is water-cooled at 1050~1100℃.

Solution treatment should be carried out before the use of austenitic stainless steel, in order to maximize the carbide and other precipitated phase in the steel solid solution to the austenite matrix, but also to homogenize the organization and eliminate stress, so as to ensure excellent corrosion resistance and mechanical properties. The correct solution treatment system is 1050~1150℃ after heating water cooling (thin parts can also be air cooling). The solution treatment temperature depends on the alloying degree of the steel: molybdenum free or low should be lower (≤1100℃), while higher alloying grades such as 00Cr20Ni18MO-6CUN and 00Cr25Ni22Mo2N should be higher (1080~1150℃).

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