Non-magnetic stainless steel for medical apparatuses and instruments and manufacturing method of non-magnetic stainless steel

Abstract

The invention discloses non-magnetic stainless steel for medical apparatuses and instruments and a manufacturing method of the non-magnetic stainless steel. The non-magnetic stainless steel is prepared from the following chemical components in percentage by weight: 0.005-0.05% of C, 0.2-1.0% of Si, 4.0-6.0% of Mn, 18.0-20.0% of Cr, 0.20-0.40% of Ag, 0.002-0.006% of O and the balance of F and unavoidable impurities; in addition, the chemical components meet the follow relational expression: Ag :Cu=0.15, Ag :(10*O) is equal to or greater than 4.5, (Nb+V): C is equal to or greater than 10.0, (Cr+Mo+1.5Si)/(Ni+30N+30C+0.25Cu+0.5Mn) is equal to or less than 1.30, Cr+3.3Mo+30N-Mn is equal to or greater than 22.0, and 580-520C-2Si-16Mn-23Ni-300N-26Cu-10Mo is equal to or lower than minus 110 DEG C. For the application requirements of non-blade medical apparatuses such as pincers in the department of orthopaedics, the hardness of the non-magnetic stainless steel can reach HV 450-505 degrees at the room temperature and meets the abrasion resistant requirement; the impact value AKV of the non-magnetic stainless steel is equal to or greater than 45 J at the room temperature and meets the tenacity requirement during clamping; the magnetic phase content of the non-magnetic stainless steel is equal to or less than 0.20% and meets the requirement of non-interference to a magnetic resonance system during an operation; and the antibiosis rate of the non-magnetic stainless steel to staphylococcus and escherichia coli is equal to or greater than 98%, so that cross infection during, before and after an operation is effectively avoided.

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%

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