Method for surface treatment of Cr-steel

A technology of surface treatment, chrome steel, applied in the direction of supporting elements of blades, engine elements, machines/engines, etc., which can solve the problems of not always reliable, cost-intensive, unsatisfactory organizational structure, etc., to achieve cost-effective, high oxidation resistance and solid particle corrosion resistance, the effect of less weight gain

Inactive Publication Date: 2013-03-06
GENERAL ELECTRIC TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this coating are on the one hand that it is expensive and on the other that it is not always reliable
However, the latter has the disadvantage that it is very cost-intensive and undesirable in terms of the desired organizational structure in the construction of power stations

Method used

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  • Method for surface treatment of Cr-steel
  • Method for surface treatment of Cr-steel

Examples

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Embodiment Construction

[0016] According to the following examples and Figures 1 to 2 The invention is further clarified.

[0017] A ferritic chromium steel having the following chemical composition (weight % data) was treated according to the invention:

[0018] 0.2C

[0019] 0.5Mn

[0020] 0.28Si

[0021] 11.6Cr

[0022] 0.8Mo

[0023] 0.7Ni

[0024] 0.27V

[0025] The rest is iron and unavoidable impurities. In this embodiment, the above-mentioned steel material is shot-peened with aluminum alloy particles (particle size: 200-400 μm). The hardness of the aluminum alloy is 90 to 120HV0.2, which has the following chemical composition:

[0026] 5.5~7%Cu

[0027] <1%Fe

[0028] >1.6% Si

[0029] ≤1.5%Zn

[0030] ≤0.15Ti

[0031] ≤0.2Ni

[0032] ≤0.3Mn

[0033] ≤0.15Pb

[0034] ≤0.1Sn.

[0035] The steel surface is shot peened with the above particles for 5 minutes, where the pressure is about 6 bar and the angle of the nozzle to the surface is 80-85°.

[0036] Advantageously, subse...

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Abstract

A method for the surface treatment of ferritic / martensitic 9-12% Cr steels and of austenitic Cr steels for the purpose of achieving increased resistance to oxidation and solid particle erosion at application temperatures of above 500° C., in particular of approximately 650° C., in steam, includes that the surface of the steel is shot-peened with particles of aluminum or of an aluminum alloy; optionally, in a subsequent step, the surface of the steel is smoothed to a roughness of <0.5 mum, preferably <0.3 mum. Following additional heat treatment is not necessary, and the parts thus treated may be employed, for example, as blades in steam turbines.

Description

technical field [0001] The invention relates to the field of material science and technology. It concerns a method for the surface treatment of ferritic / martensitic 9-12% chromium steels and highly alloyed austenitic chromium steels, which are mainly used in the production of steels used in steam power stations. member. These steels are exposed to high temperatures (typically 600°C to 650°C) and must therefore be protected against degradation, ie loss of mass, caused by oxidation and subsequent spalling. Background technique [0002] It is known from the prior art, in particular, to use austenitic steels highly alloyed with chromium for superheater tubes and reheater tubes of power stations. It is known from austenitic steels that an improved oxidation behavior of the material can be obtained by cold forming of the surface, for example by bombarding the steel surface with small particles of carbon steel at high velocity (=shot peening). The reason for this is the martensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/06B23P9/00F01D5/28
CPCC22C38/18C21D7/06Y10T29/49336
Inventor R·B·斯卡林S·斯特劳布R·诺德勒
Owner GENERAL ELECTRIC TECH GMBH
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