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Medical martensitic stainless steel material and preparation method thereof

A technology of martensitic stainless steel and medical equipment, applied in the field of medical equipment materials, can solve the problems of low oxidation resistance, low corrosion resistance, easy to rust, and high cost, and achieve improved corrosion resistance, simple chemical composition, and low price Effect

Active Publication Date: 2012-07-18
徐英忱
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, martensitic stainless steel such as Cr13 and 9Cr18 is usually used in China to make medical devices. Although the hardness of this type of steel can meet the requirements after quenching treatment, it has low oxidation resistance and corrosion resistance. It is easy to rust during use and easy to weld during welding. In recent years, it has been gradually replaced by 0Cr17Ni4Cu4Nb (referred to as 17-4) martensitic precipitation hardening stainless steel. This kind of steel has low carbon, high chromium and copper content, so it has strong corrosion resistance, rust resistance and good weldability. , but its disadvantage is that the hardness after aging treatment is low, and its HRC value is up to 42. In normal production, it is generally around 40. It is not suitable for making sharp-edged instruments such as bone chisels, bone drills, or shears.
At the same time, the heat treatment process is complicated, and due to the elements such as nickel and niobium, the cost is high

Method used

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  • Medical martensitic stainless steel material and preparation method thereof
  • Medical martensitic stainless steel material and preparation method thereof
  • Medical martensitic stainless steel material and preparation method thereof

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preparation example Construction

[0016] Its preparation method comprises the following steps:

[0017] (1) According to the chemical composition and its weight percentage range, according to the batch production situation, electric arc furnace should be used for smelting and casting steel ingots for mass production; non-vacuum induction furnace should be used for smelting and casting steel ingots for small production to reduce costs; in special cases, Vacuum induction furnace is used to melt and cast steel ingots to further improve the quality of steel;

[0018] (2) Heating the steel ingot to 1050-1100°C, forging blanks or forging into forgings with simple shapes; the final forging time temperature is 800°C, and slowly cool to room temperature after hot working;

[0019] (3) Reheat the steel ingot to 1050-1100°C, roll and process it into bars and plates, then put it into a furnace at 800°C-850°C, cool it to 500°C with the furnace, and perform air-cooling annealing treatment to transform it into Pearlite, har...

Embodiment 1

[0025] According to the chemical composition scope and proportioning ratio of stainless steel according to the present invention, carry out batching, melt 3 furnaces with vacuum induction furnace, cast 3 20 kilograms steel ingots respectively, its chemical composition is listed in Table 1.

[0026] The chemical composition of the medical martensitic stainless steel material that table 1 embodiment 1 provides

[0027]

[0028] Wherein Zr is a batching component.

[0029] The above three steel ingots are heated at 1075±25°C, and then forged into Φ10, Φ20, Φ30mm round bars and 20×20×500mm square bars; the final forging temperature is 850°C, and then air-cooled to room temperature.

[0030] The above billets are heated again to 1075±25°C, and rolled into parts of medical devices, such as hammers, bone chisels, bone drills, wire pliers, etc. After hot rolling, they are placed in a furnace at 850°C and cooled to 500°C, then taken out and air-cooled .

[0031] Finally, the above...

Embodiment 2

[0037] According to the stainless steel chemical composition range and proportioning ratio described in the present invention, carry out batching, melt 2 furnaces with 150kg non-vacuum induction furnace, and cast 2 140kg steel ingots respectively, its chemical composition is listed in Table 4.

[0038] The chemical composition of the medical martensitic stainless steel material that table 4 embodiment 2 provides

[0039]

[0040] Wherein Zr is a batching component.

[0041] The above two steel ingots are heated to 1075±25°C, and then forged to open billets. The steel ingots of non-01-1 furnace number are forged into Φ50mm round bars, and the non-01-2 furnace number steel ingots are forged into 200×45mm thick slabs; the final forging temperature is 850 °C, then air cooled to room temperature.

[0042] The above-mentioned billets are heated again to 1075±25°C, rolled into bars of Φ14, 16, 18, and 20mm, and plates of thickness 18, 20, and 25mm×200mm in width, and put into a f...

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Abstract

The invention discloses a medical martensitic stainless steel material and a preparation method thereof. The medical martensitic stainless steel material is prepared from the following chemical components in percentage by weight: 0.2-0.4% of carbon (C), 15-18% of chromium (Cr), 1.5-4% of molybdenum (Mo), at most 0.05% of zirconium (Zr), at most 1.0% of silicon (Si), at most 1.0% of manganese (Mn), less than 0.03% of sulfur (S), less than 0.03% of phosphorus (P) and the balance of iron (Fe). The preparation method comprises the following steps: (1) smelting according to the chemical componentsin percentage by weight, and casting steel ingots; (2) heating the steel ingots to 1050-1100 DEG C to carry out hammer cogging or hammer forging; (3) reheating the steel billet to 1050-1100 DEG C, rolling, carrying out furnace cooling to 500 DEG C, and carrying out air cooling for annealing treatment; (4) machining to obtain product parts of medical appliances; and (5) heating the product parts of medical appliances to 950-1050 DEG C in a vacuum heat treatment furnace, and quenching by air cooling to obtain the finished product. The stainless steel material disclosed by the invention has the characteristics of no toxicity, high strength, corrosion resistance and no rusting, and is easy to process and is weldable, and the Rockwell hardness (HRC) is up to 45-60.

Description

technical field [0001] The invention relates to a medical stainless steel material, in particular to a medical martensitic stainless steel material and a preparation method thereof, belonging to the technical field of medical device materials. Background technique [0002] In the field of medical devices, there are special requirements for mechanical properties and corrosion resistance for materials and products used in high-temperature steam sterilization and in contact with blood, body fluids, and saline environments, requiring no corrosion, no rust, and high strength. High, high hardness, anti-strike, sharp edge, continuous edge, non-rolling edge. [0003] At present, martensitic stainless steel such as Cr13 and 9Cr18 is usually used in China to make medical devices. Although the hardness of this type of steel can meet the requirements after quenching treatment, it has low oxidation resistance and corrosion resistance. It is easy to rust during use and easy to weld during...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C33/04
Inventor 徐英忱
Owner 徐英忱
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