Method for surface treatment of Cr-steel

A surface-treated, chrome-steel technology, applied in blade support elements, engine elements, machines/engines, etc., that solves problems such as cost-intensive, unsatisfactory structure, not always reliable, and achieves high oxidation resistance and solid Particle corrosion resistance, less weight gain, cost-effective effects

Inactive Publication Date: 2008-12-24
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

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Embodiment Construction

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

[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). Aluminum alloys have a hardness of 90 to 120 HV 0.2 and have 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, subsequ...

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PUM

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Abstract

The invention relates to a chrome steel surface treatment method, especially a method for surface treatment of ferrite / martensite containing 9-12% of chrome steel and austenite chrome steel, in order to increase antioxidation and solid particle corrosion resistance in steam when the use temperature is above 500 DEG C, especially about 650 DEG C. The steel surface is subjected to shot blasting byaluminium particles or aluminium alloy pellets, wherein selectively the steel surface is flattened to the roughness less than 0.5 Mum, preferably less than 0.3 Mum in the next steps. The subsequentlyadditional hot treatment is not necessary and the treated chrome steel can be used, such as blade in steam turbine.

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 Applications(China)
IPC IPC(8): C21D7/06B23P9/00F01D5/28
CPCC21D7/06C22C38/18Y10T29/49336
Inventor R·B·斯卡林S·斯特劳布R·诺德勒
Owner GENERAL ELECTRIC TECH GMBH
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