A kind of non-magnetic stainless steel for medical equipment and its manufacturing method

Abstract

A non-magnetic stainless steel for medical equipment and a manufacturing method thereof. The chemical composition weight percentage of the steel is: C: 0.005-0.05%, Si: 0.2-1.0%, Mn: 4.0-6.0%, Cr: 18.0-20.0%, Ni: 8.0-10.0%, N: 0.15-0.25%, Cu: 1.30-2.70%, Mo: 1.0-2.0%, V: 0.10-0.20%, Nb: 0.20-0.40%, Ag: 0.20-0.40%, O : 0.002~0.006%, the rest is Fe and unavoidable impurities; and the above elements need to meet the following relationship at the same time: Ag: Cu = 0.15 and Ag: (10×O) ≥ 4.5 and (Nb + V): C ≥ 10.0 and (Cr+Mo+1.5Si) / (Ni+30N+30C+0.25Cu+0.5Mn)≤1.30, Cr+3.3Mo+30N‑Mn≥22.0, 580‑520C‑2Si‑16Mn‑23Ni‑300N‑26Cu‑ 10Mo≤‑110°C. For the application requirements of non-blade medical devices such as orthopedic forceps, the hardness of the material at room temperature reaches HV 450-505 degrees, which meets the wear resistance requirements; the impact value of the material at room temperature AKV≥45J, meets the toughness requirements during clamping; the magnetic phase content ≤0.20%, It meets the requirement of no interference to the magnetic resonance system during the operation; the antibacterial rate of the material against Staphylococcus and Escherichia coli is ≥98%, effectively avoiding cross-infection during the operation and before and after the operation.

Description

technical field [0001] The invention relates to a non-magnetic stainless steel for medical equipment and a manufacturing method thereof, in particular to a high-hardness and high-toughness antibacterial non-magnetic stainless steel and a manufacturing method thereof. Background technique [0002] China's medical device industry currently has more than 14,000 manufacturers and more than 40,000 distributors, with an annual output value and market growth rate of more than 20%. However, there are structural problems in China's medical device industry, and some major high-end diagnostic and medical equipment and medical devices have always relied on imports. According to statistics, the overall scale of China's medical equipment is 300 billion yuan, and nearly 70% of the market share is occupied by foreign brands. The sales ratio of medical devices and pharmaceuticals in developed countries is about 1:1, while in China it is only 1:10. The "Twelfth Five-Year" Special Plan for t...

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Problems solved by technology

Patent CN03110896.2 discloses a medical implant austenitic stainless steel material, its Cr: 17-22%, Mn: 12-20%, Mo: 1-3%, Cu: 0.5-1.5%, N: 0.40- 0.70%, Ni≤0.02%, high-nitrogen nickel-free material, mainly to solve the biological sensitivity problem of Ni precipitation after stainless steel implantation

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