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Use of a non-corrosive, martensitically hardening steel

A martensite and purpose technology, applied in the application field of corrosion-resistant maraging steel, can solve problems such as easy cracking, and achieve the effect of high ductility and good biocompatibility

Inactive Publication Date: 2005-12-14
SANDVIK INTELLECTUAL PROPERTY AB
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  • Abstract
  • Description
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Problems solved by technology

It also has disadvantages during the production of semi-finished products, for example, this steel is prone to cracks in the annealed state

Method used

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  • Use of a non-corrosive, martensitically hardening steel

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Embodiment Construction

[0034] In accordance with the requirements of the present invention, fracture and hardness resistance tests were carried out on fully hardened solid material workpieces of the same geometric shape manufactured using the steel grade described in the present invention and two other steel grades currently used to make rotary tools. Tensile strength and elongation test.

[0035] According to the invention, the steel grade tested was a material with the 766685 material composition given in Table 2. For other details, see Table 2.

[0036] Material

[0037] 769228

[0038] The chemical compositions of steel grades 1.4112 and 1.4108 are given in Table 1, and they were used as comparative steel grades. The test specimens were rods of solid material with a circular cross-section and a diameter of 4.5 mm. All test specimens were precipitation hardened. According to the invention, hardening of the steel takes place at 475° C. for 4 hours. According to the harden...

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Abstract

The object of the present invention is to manufacture mechanically manipulated rotary tools, preferably drilling, milling, grinding and cutting tools, which have stable corrosion resistance and biocompatibility, but also have high mechanical strength properties and good ductility . For this purpose, the present invention relates to the use of a precipitation-hardening martensitic stainless chromium-nickel steel having the following composition (in wt.-%): chromium: 10 to 14, nickel: 7 to 11, molybdenum: 0.5 to 6, copper: 0.5 to 4, aluminum: 0.05 to 0.55, titanium: 0.4 to 1.4, carbon + nitrogen: up to 0.3, sulfur: less than 0.05, phosphorus: less than 0.05, manganese: up to 0.5, silicon: up to 0.5, tantalum, niobium, vanadium and tungsten: maximum content of 0.2 each, cobalt: up to 9.0 when appropriate, boron: 0.0001 to 0.1 when appropriate, the remainder being iron and usual impurities.

Description

technical field [0001] The present invention describes a novel use of a precipitation-hardenable martensitic stainless steel for the production of rotary tools where a combination of high hardness and ductility and corrosion resistance are required, e.g. for drilling, Milling, grinding and cutting tools. Background technique [0002] Precipitation-hardening martensitic stainless steels are already known from WO 93 / 07303, which describes a composition of stainless steels having very high strength and, at the same time, good ductility. This steel is described as being most suitable for making injection cannulas, dental appliances and medical instruments, and the raw material is wire and strip manufactured from the above-mentioned types of steel. Due to the extremely high hardness of this steel grade, further processing is limited to a minimum. [0003] In WO 01 / 14601 A1 a process is described for the manufacture of components with complex geometries which comprises a series ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/06C22C38/42C22C38/44C22C38/50
CPCC22C38/004C22C38/06C22C38/42C22C38/44C22C38/50
Inventor 贝恩德·布兰克
Owner SANDVIK INTELLECTUAL PROPERTY AB
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