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Steel, product created from said steel, and manufacturing method thereof

A trace, sheet technology, used in the manufacture of tools, shafts and bearings, heat treatment furnaces, etc., which can solve the problem of high content of high-cost elements

Inactive Publication Date: 2018-06-08
艾普伦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the content of high-cost elements remains high in the application's best recommendation

Method used

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  • Steel, product created from said steel, and manufacturing method thereof
  • Steel, product created from said steel, and manufacturing method thereof
  • Steel, product created from said steel, and manufacturing method thereof

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Embodiment Construction

[0138] The composition (expressed in weight percent) of the steel is determined based on the following considerations.

[0139] The Ni content is 10.0% to 24.5%, preferably 12.0% to 24.5%. under these circumstances:

[0140] Firstly, by conventional heat treatment, a highly martensitic structure is obtained, i.e. meaning that at least 30%, more preferably at least 50% of the martensitic structure can be seen on the surface of the structure on a micrograph; irrespective of the heat treatment applied, more than A Ni content of 24.5% in combination with the required content of other elements will not be able to obtain this structure;

[0141] Secondly, after precipitation hardening, for the envisaged applications, advantageous properties are obtained, in particular ductility, expansibility, yield strength, K1C toughness; a minimum Ni content of 10.0%, the associated defined proportions of Co, Mo and other metal elements It is suitable to obtain this property; a minimum Ni conte...

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Abstract

The invention relates to steel, the composition of which is, in wt%: 10.0% <= Ni <= 24.5%, 1.0% <= Mo <= 12.0%, 1.0% <= Co <= 18.0%, 14.0% <= Mo + Co + Si + Mn + Cu + W + V + Nb + Zr + Y + Ta + Cr + C+ Al + B + Ti + N <= 29.0%, 21.5% <= Ni + Co + Mo <= 40.0%, traces <= Al <= 4.0%, traces <= Ti <= 0.1%, traces <= N <= 0.010%, traces <= Si <= 4.0%, traces <= Mn <= 13.0%, traces <= C <= 0.03%, traces <= S <= 0.0020%, traces <= P <= 0.005%, traces <= B <= 0.01%, traces <= H <= 0.0005%, traces <= O <= 0.03%, traces <= Cr <= 5.0%, traces <= Cu <= 4.0%, traces <= W <= 6.0%, traces <= Zr <= 4.0%, traces <= Ca <= 0.1%, traces <= Mg <= 0.8%, traces <= Nb <= 4.0%, traces <= V <= 4.0%, traces <= Ta <= 4.0%, traces <= Y <= 4.0%, the remainder being iron and impurities resulting from the production. The inclusion population, observed by image analysis on a polished surface of 650 mm2 if the steel is in the form of a hot-formed part or a hot-rolled sheet and 800 mm<2> if the steel is in the form ofa cold-rolled sheet, does not comprise non-metal inclusions of an equivalent diameter greater than 10 [mu]m. The invention also relates to a product created from said steel, such as a metal sheet or strip, and to the manufacturing method thereof.

Description

technical field [0001] The present invention relates to the field of so-called "maraging steels" and relates to steels for use especially in applications requiring one or more of the following properties: excellent mechanical properties (extremely high fatigue strength, high yield strength and high breaking strength), ease of heat treatment and dimensional stability after these treatments, ease of welding and good formability. Background technique [0002] These maraging steels are characterized by a martensitic structure which is able to harden after aging by precipitating intermetallic phases suitable for obtaining high mechanical properties during aging. [0003] In general, known M 250 type maraging steels include those having the following typical composition (as with all compositions shown in all parts of this text, expressed in weight percent): Ni = 18%, Co = 9%, Ti = 0.45% (known as X2NiCoMo18-9-5 steel), the rest is usually iron and impurities brought by manufactur...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/02C22C38/06C22C38/08C22C38/10C22C38/12C22C38/14C22C38/16C22C38/18C21D9/00C21D9/30C21D9/46C22B9/18C22B9/20C22C1/02C22C30/00
CPCC21D9/00C21D9/0068C21D9/30C22B9/20C22C1/02C22C30/00C22C38/001C22C38/002C22C38/004C22C38/02C22C38/06C22C38/08C22C38/105C22C38/12C22C38/14C22C38/16C22C38/18C21D2211/004C21D2211/008C21D9/46C21D1/06C21D6/004C21D6/005C21D6/007C21D6/008C21D7/06C21D8/0205C21D8/0226C21D8/0236C21D8/0268C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54Y02P10/25C22C38/22C22C38/30C21D8/02C22C38/10C22C38/58F16C3/02F16G5/16
Inventor 瓦莱丽·佩兰·盖琳
Owner 艾普伦
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