Heat treatment technology of stainless steel in Precision Foundry

(1) Martian bulk iron stainless steel: this kind of stainless steel body centered cubic structure (BCC) can attract the magnet and get it from Austin temperature. It has the best corrosion resistance, but the material is hard and brittle. Then tempering can increase the ductility, but the corrosion resistance will be reduced, especially between 450 ℃ and 650 ℃, It will cause the diffusion and precipitation of carbon atoms in the crystal lattice gap and form a network of chromium carbide with chromium, resulting in the consumption of chromium in the adjacent area, reducing the composition of chromium, unable to form a protective film and losing corrosion resistance, so special attention should be paid. The following is the heat treatment temperature of all kinds of stainless steel materials of Mata bulk iron.

 (a) The temperature of 403410416se is 650-750 ℃.

 (b) The temperature of 414 is 650-730 ℃.

 (c) The temperature of 431 is 6 (d) The temperature of 440-a, 440-b, 440-c and 420 is 680-750 ℃.

(2) Fat grain iron stainless steel: This stainless steel body centered cubic structure (BCC) can attract magnets. It is usually used in the automotive industry or chemical industry. The strength will not change due to heat treatment, but the strength can be increased by cold processing.

(3) Austin iron stainless steel: this kind of stainless steel face centered cubic structure (FCC) has no effect on the magnet. As mentioned above, this kind of material is easy to process, so it can eliminate the residual stress of the material after processing and can be subject to different heat treatment.

(4) Precipitation hardening stainless steel: this kind of stainless steel is quenched at high temperature and heat treated at low temperature. Due to the precipitation of aluminum or copper elements in the material and the formation of inter metallic compounds along the differential sliding surface or grain boundary, its strength or hardness can be improved. Commonly used precipitation hardening stainless steel 17-4PH, others include 17-7ph, ph15-7mo, am-350, am-355, etc.

(5) Post weld heat treatment of all kinds of stainless steel: after welding, the chromium contained in stainless steel often diffuses and precipitates and carbon bonds to synthesize chromium carbide in the high-temperature area (heat affected zone), resulting in the reduction of local chromium composition and the inability to form a protective film. However, corrosion such as perforation often occurs in these heat affected zones, which can remedy this situation. Operators often heat treat the objects after welding, Its function can make the chromium elements in other areas diffuse to this chromium deficient area to achieve the protective effect.

Factory from long range

Hebei Junya Precision Machinery Co., Ltd., founded in 2017, is a high-tech enterprise integrating product design, mold development, casting, processing, surface treatment, testing and inspection and sales services. The factory covers an area of 5000 square meters and is located in Huanghua economic and Technological Development Zone, Hebei Province. The company has superior geographical location and convenient transportation. After years of development, the company has introduced advanced production equipment and management experience in various industries, and trained dozens of excellent professional R & D and technical talents.

At present, the company has more than 100 employees and more than 20 technical and R & D personnel. The company’s main products are stainless steel cast pipe fittings, quick connectors, ball valves, check valves, precision accessories, marine hardware, cast auto parts, etc. The product material is mainly 304 304l316 316lcf8m WCB 1.4408, etc. The company officially passed ISO9000 certification in 2020 and is actively preparing for TS16949 quality system certification. With its good product quality and reputation, the company has become more and more prominent in the international market, with partners all over the world.

In 2019, the export volume accounted for more than 60% of the total sales, and has established long-term and stable cooperative relations with many enterprises in Europe, the United States and Japan. The company always adheres to the business philosophy of heart, innovation and ingenuity. Based on the principle of seeking development from R & D, meeting opportunities in development, building trust in opportunities and consolidating contacts in trust, we look forward to cooperating with you. For details, please contact 18902146189


Post time: Apr-22-2022