Stainless steel powder metallurgy process

PM stainless steel，Powder metallurgy，Stainless steel manufacturing process

Stainless steel powder metallurgy process process step, you know? ZCMIM powder metallurgy factory in Shenzhen for your explanation, powder metallurgy stainless steel refers to the manufacture of stainless steel powder metallurgy. Using this method allows the preparation of stainless steel microstructure refinement, reduction of segregation of alloying elements to improve the performance of the material. In addition, it can save raw materials and energy-saving, low-carbon, green, green.

    

Stainless steel powder metallurgy process is the preparation of a powder -> forming -> sintering.

    

Preparing a powder produced by powder metallurgy method is the first step in the stainless steel, which can be water atomized, molten steel flows from the nozzle leak, disperse with high pressure water, solidified, to obtain a powder of stainless steel. Water atomized steel powder bulk density of 2.5 ~ 3.2 g / cm3. May also be aerosolized, the bulk density of the high-pressure nitrogen gas atomized powder was 4.8 g / cm3, the oxygen content of the powder is less than 10-4. It can also produce a spherical stainless steel powder rotating electrode milling method.

    

Next is forming. Pressure forming is 550 ~ 830 MPa.

    

The next step is sintering. Because stainless steel alloying elements easily oxidized, it must be sintered at very low oxygen content in the protective atmosphere, if hydrogen or decomposition of ammonia as a protective atmosphere, dew point should be -45 ~ -50 ℃. May also be vacuum sintering, the sintering temperature is 1120 ~ 1150 ℃. These stainless steel powders can also be loaded into the package sleeve, after vacuum sealing, cold isostatic pressing, followed by hot isostatic densification timber, process parameters 1050 ℃, pressure of 2 kPa.