Use of martensitic precipitation hardening stainless steel

A precipitation hardening, stainless steel technology, used in prosthesis, medical science, surgery, etc., to achieve the effect of high strength, high ductility, excellent corrosion resistance

Inactive Publication Date: 2006-04-12
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This steel type provides acceptable ductility for the finished product, but only around 2,000N / mm 2 Strength of
It may also have certain defects during the processing of semi-finished products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] Tensile strength, elongation at break and hardness were tested on hardened solid material specimens of the same geometry in the steel used for the purposes of the present invention and in the two steels currently used in rotary tools.

[0019] The steel of the invention tested has a composition according to the preferred embodiment described above, i.e. by weight: 12.0% chromium, 9.1% nickel, 4.0% molybdenum, 2.0% copper, 0.9% titanium, 0.35% aluminum , <0.12% carbon and <0.012% nitrogen. The steels used for comparison were steel types 1.4112 and 1.4108, the composition of which is given in Table 1 above. The test pieces were solid rods with circular cross-section and a diameter of 4.5 mm. All tested specimens were precipitation hardened. The steel of the invention is hardened at a temperature of 475°C for 4 hours. 1.4112 and 1.4108 steels are hardened according to the hardening methods specified for these steels. Hardening of steel types 1.4112 and 1.4108 is carrie...

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PUM

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Abstract

The invention relates to the use of a chrome-nickel martensitic precipitation hardening stainless steel having the following composition: 10-14 mass % chromium, 7-11 mass % nickel, 0.5-6 mass % molybdenum, 0.5-4 mass % copper, 0.05-0.55 mass % aluminium, 0.4-1.4 mass % titanium, up to 0.3 mass % carbon + nitrogen, less than 0.05 mass % sulfur, less than 0.05 mass % phosphorus, up to 0.5 mass % manganese, up to 0.5 mass % silicium, up to 0.2 mass % tantalum, niobium, vanadium and tungsten, respectively, possibly 0.9 mass % cobalt, possibly 0.0001-0.1 mass % boron, the rest being iron and ordinary impurities. Said steel is used for producing surgery implants and osteosynthesis products which are pointwisely or long-lastingly used outside and inside a body.

Description

technical field [0001] The present invention relates to novel uses of precipitation-hardening martensitic stainless steels, in particular in the field of medical applications, such as implants and bone joint products applied or held inside or outside the human body. Background technique [0002] Precipitation hardening martensitic stainless steels are known from WO 93 / 07303. This patent describes a stainless steel composition that combines very high strength and good ductility simultaneously. The stainless steel is described as being particularly suitable for use in the manufacture of syringes, dental instruments, and medical instruments, among others. [0003] WO 01 / 14601 A1 describes a method for producing medical or dental instruments through a sequence of steps including precipitation hardening, tempering, quenching and hardening, resulting in a uniform hardness of at least 450 HV. [0004] By way of example, precipitation hardening martensitic stainless steels can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61L27/04A61L31/02
CPCA61L27/047A61L31/022A61L27/04A61L31/02A61L27/02
Inventor 贝恩德·布兰克马蒂亚斯·格肯
Owner SANDVIK INTELLECTUAL PROPERTY AB
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