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A precipitation haredning steel and its manufacture

A precipitation hardening, formula technology, applied in the direction of coating, metal material coating process, solid diffusion coating, etc., can solve the problem of high manufacturing cost

Pending Publication Date: 2019-04-16
OVAKO SWEDEN AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • A precipitation haredning steel and its manufacture
  • A precipitation haredning steel and its manufacture
  • A precipitation haredning steel and its manufacture

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[0045] Before the present invention is disclosed and described in detail, it is to be understood that this invention is not limited to the particular compounds, configurations, method steps, substrates and materials disclosed herein as such compounds, configurations, method steps, substrates and materials may vary. It is also to be understood that the terminology employed herein is for the purpose of describing particular embodiments only and is not intended to be limiting, since the scope of the present invention will be limited only by the appended claims and the equivalents thereof.

[0046]It must be noted that as used in this specification and the appended claims, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

[0047] Unless otherwise defined, any terms and scientific terms used herein are intended to have the meaning commonly understood by one of ordinary skill in the art to which this invention belongs.

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Abstract

There is provided a precipitation hardening steel with the composition: C: 0.05-0.30 wt%, Ni: 3-9 wt%, Mo: 0.5-1.5 wt%, Al: 1-3 wt%, Cr: 2-14 wt%, V: 0.25-1.5 wt%, Co: 0-0.03 wt%, Mn: 0-0.5 wt%, Si: 0-0.3 wt%, and remaining part up to 100 wt% is Fe and impurity elements, with the additional proviso that the amounts of Al and Ni also fulfil Al = Ni/3 +/- 0.5 in wt%. There is the possibility to havevery low amounts of cobalt, well below 0.01 wt%. The precipitation hardening steel displays, low segregation, high yield strength at elevated temperatures, high resistance against corrosion, and canalso suitably be nitrided. The precipitation hardening steel is more economical to manufacture compared to steel according to the state of the art with the same strength at elevated temperatures.

Description

technical field [0001] This invention generally relates to high strength precipitation hardening steels suitable for use at elevated temperatures. The precipitation hardening steel composition is optimized to give both precipitation hardening of carbides and intermetallic precipitation of Ni-Al present after tempering. New precipitation hardening steels are designed to have low micro and macro segregation. A precipitation hardening steel substantially free of cobalt can be provided. Background technique [0002] Primary hardening is when the steel is field quenched from the austenitic phase to a martensite or bainite microstructure. In general, steels containing carbides are known. Low alloy carbon steels form iron carbides during tempering. These carbides coarsen at high temperature, which reduces the strength of the steel. When the steel contains strong carbide forming elements such as molybdenum, vanadium and chromium, the strength can be increased by tempering at hi...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/40C22C38/44C22C38/46C21D6/00C21D6/02C21D1/18
CPCC21D1/18C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/40C22C38/44C22C38/46C21D2211/001C21D2211/004C21D2211/008C21D1/25C21D6/004C21D6/02C21D1/06C21D6/005C21D6/008C23C8/02C23C8/26
Inventor 贾恩·埃瑞克·安德松
Owner OVAKO SWEDEN AB