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Precipitation hardening stainless steel and its manufacture

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

Active Publication Date: 2021-09-10
OVAKO SWEDEN AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, M-50 steel suffers from segregation which it is desirable to avoid
In addition, the manufacturing cost of M-50 steel is quite high

Method used

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  • Precipitation hardening stainless steel and its manufacture
  • Precipitation hardening stainless steel and its manufacture
  • Precipitation hardening stainless steel and its manufacture

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Embodiment Construction

[0046] 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.

[0047] 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.

[0048] 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

Precipitation hardening stainless steels are available with the following compositions: C: 0.05‑0.30wt%, Ni: 9‑10wt%, Mo: 0.5‑1.5wt%, Al: 1.75‑3wt%, Cr: 10.5‑13wt%, V: 0.25‑ 1.5wt%, Co: 0-0.03wt%, Mn: 0-0.5wt%, Si: 0-0.3wt%, and the remainder to 100wt% is Fe and impurity elements, with the additional condition that the amount of Al and Ni is also Satisfy Al=Ni / 4±0.5wt%. In addition, Cr eq in the interval 11‑15.4 wt%, and Ni eq In the interval 10.5‑15 wt%. There can be very small amounts of cobalt, well below 0.01 wt%. Precipitation hardening stainless steels exhibit low segregation, high yield strength at elevated temperatures, and can also be suitably nitrided. Precipitation-hardening stainless steels are more economical to manufacture than stainless steels according to the prior art which have the same strength at high temperatures.

Description

technical field [0001] This invention generally relates to high strength precipitation hardening stainless steels suitable for use at elevated temperatures. The precipitation hardening stainless steel composition is optimized to give both precipitation hardening of carbides and intermetallic precipitation of Ni-Al present after tempering. The new steels contain a high proportion of the martensitic phase and are designed to have low micro and macro segregation. A substantially cobalt free steel may 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C21D6/00C21D6/02C21D1/18C22C38/04C22C38/06C22C38/08C22C38/12C22C38/40C22C38/44C22C38/46
CPCC22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/52C21D1/18C21D6/004C21D6/005C21D6/007C21D6/008C21D6/02C22C38/08C22C38/12C22C38/40C21D2211/001C21D2211/004C21D2211/008C21D1/25C21D1/06C23C8/02C23C8/26
Inventor 贾恩-埃瑞克·安德松
Owner OVAKO SWEDEN AB
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