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High-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) and manufacturing method thereof

An antibacterial stainless steel and austenite technology, applied in the field of alloys, can solve the problems that chromium-nickel stainless steel does not have antibacterial properties, increases the risk of nickel sensitization, and has strong work hardening ability, and achieves good anti-microbial corrosion performance and excellent resistance to spots. corrosion resistance, good antibacterial properties

Active Publication Date: 2013-04-17
郭强
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Chromium-nickel austenitic stainless steel such as 316L is widely used in medical equipment, biomedical materials, jewelry materials and other fields due to its good corrosion resistance and formability, but they all contain a certain amount of nickel more or less. There is a risk of nickel sensitization during the process; in addition, these products often carry bacteria, but ordinary chromium-nickel stainless steel itself does not have antibacterial properties, which may cause bacterial infection and transmission problems
However, some studies have found that the adhesion of bacteria on the surface of high-nitrogen nickel-free austenitic stainless steel is much more serious than that on the surface of traditional austenitic stainless steel, and the metabolites of bacteria will aggravate the localized corrosion of stainless steel; in addition, the existing high Nitrogen austenitic stainless steel generally has problems such as high yield ratio, strong work hardening ability, and increased forming difficulty, especially for fine parts.
In view of the problem that ordinary austenitic stainless steel does not have antibacterial properties, researchers at home and abroad have used copper, rare earth, silver and other elements to modify it to obtain corresponding antibacterial properties, but found that nickel releases after the stainless steel is modified. rate has increased, increasing the risk of nickel sensitization

Method used

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  • High-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) and manufacturing method thereof
  • High-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) and manufacturing method thereof
  • High-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) and manufacturing method thereof

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preparation example Construction

[0035] The invention also discloses a preparation method of high-nitrogen nickel-free austenitic antibacterial stainless steel (HNSAg), comprising the following steps:

[0036] a. Smelting in a magnesia crucible: clean the crucible before smelting to avoid carburization during smelting, and then use raw materials YT0 pure iron, FeCr69 micro-carbon ferrochrome, MnN8.28 manganese nitride, FeMo60 ferromolybdenum, FeSi75 silicon Iron, electrolytic manganese, pure copper, CuAg30 copper-silver alloy, FeNb50A ferroniobium are put into the crucible and filled tightly, then close the crucible lid;

[0037] b. Vacuumize the crucible to below 5Pa, then fill the crucible melting chamber with nitrogen to 6-9atm and heat and melt to a temperature of 1600-1620°C, then pour the molten metal into the metal ingot mold to make an ingot; The ingot is hot-rolled into a slab at a temperature of 1050-1100°C, and finally solution-treated at a temperature of 1080-1150°C; high-nitrogen nickel-free aus...

Embodiment 1

[0042] The high-nitrogen nickel-free austenitic antibacterial stainless steel (HNSAg) of the present embodiment, the stainless steel composition comprises the following components by weight percentage:

[0043] Carbon 0.024%, silicon 0.48%, manganese 18.42%, chromium 18.05%, molybdenum 1.96%, copper 0.48%, phosphorus 0.011%, sulfur 0.006%, nitrogen 0.55%, niobium 0.10%, silver 0.13%, and the balance is iron.

[0044] The preparation method of the high-nitrogen nickel-free austenitic antibacterial stainless steel (HNSAg) in this embodiment includes the following steps: (The weight of the raw materials in this embodiment and the following embodiments is: weight percentage×10KG.)

[0045] a. Smelting in a magnesia crucible: clean the crucible before smelting to avoid carburization during smelting, and then put YT0 pure iron, FeCr69 micro-carbon ferrochrome, MnN8.28 manganese nitride, FeMo60 ferromolybdenum, FeSi75 silicon Iron, electrolytic manganese, pure copper, CuAg30 copper s...

Embodiment 2

[0049] The high-nitrogen nickel-free austenitic antibacterial stainless steel (HNSAg) of the present embodiment, the stainless steel composition comprises the following components by weight percentage:

[0050] Carbon 0.023%, silicon 0.53%, manganese 18.04%, chromium 18.10%, molybdenum 1.92%, copper 0.49%, phosphorus 0.013%, sulfur 0.008%, nitrogen 0.52%, niobium 0.10%, silver 0.19%, and the balance is iron.

[0051] The preparation method of the high-nitrogen nickel-free austenitic antibacterial stainless steel (HNSAg) of the present embodiment comprises the following steps: a. melting in a magnesia crucible: before melting, the crucible is cleaned up to avoid carburization during smelting, and then YT0 pure iron, FeCr69 micro-carbon ferrochromium, MnN8.28 manganese nitride, FeMo60 ferromolybdenum, FeSi75 ferrosilicon, electrolytic manganese, pure copper, CuAg30 copper silver, FeNb50A ferro-niobium into the crucible and close the crucible cover after filling densely ; Among t...

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Abstract

The invention discloses high-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) and a manufacturing method thereof. The stainless steel comprises carbon, silicon, manganese, chromium, molybdenum, copper, nitrogen, niobium, silver and the balance of iron by weight percent; the high-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) is of a single austenite structure after subjected to solution treatment, and is excellent in pitting corrosion resistance in a non-microorganism environment and good in bacterial resistance and microorganism corrosion resistance in a microorganism environment; the antibacterial rate of the stainless steel on staphylococcus aureus and escherichia coli reaches more than 93%; the nickel release risk is inexistent; the manganese release rate in artificial saliva and sweat is much lower than the acceptable daily intake standard; the stainless steel can be used as a biomedical material; and the metal toxicity risk is inexistent. The high-nitrogen nickel-free austenite antibacterial stainless steel (HNSAg) is very good in flexibility and plasticity, can meet the processing requirements of fine parts such as jewelries and the like, and is superior to chromium-nickel austenite antibacterial stainless steel of 316 L and the like in overall performance.

Description

technical field [0001] The invention relates to an alloy, in particular to a high-nitrogen nickel-free austenitic antibacterial stainless steel (HNSAg) for biomedical materials and jewelry and a preparation method thereof. Background technique [0002] Chromium-nickel austenitic stainless steel such as 316L is widely used in medical equipment, biomedical materials, jewelry materials and other fields due to its good corrosion resistance and formability, but they all contain a certain amount of nickel more or less. There is a risk of nickel sensitization during the process; in addition, these products often carry bacteria, but ordinary chromium-nickel stainless steel itself does not have antibacterial properties, which may cause bacterial infection and transmission problems. [0003] In view of the sensitization risk of nickel-containing austenitic stainless steel, researchers at home and abroad have extended the research and application of high-nitrogen austenitic stainless s...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C33/06C21D6/00
Inventor 袁军平李卫王国智王昶
Owner 郭强
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