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Anti-corrosion wear-resistance high chrome cast iron alloy and preparing method thereof

A high-chromium cast iron, wear-resistant technology, applied in the field of wear-resistant metal materials, can solve the problems of inability to guarantee the strength of high-chromium cast iron, high heat treatment temperature, unfavorable high-chromium cast iron, etc., to reduce the number and electromotive force, improve the absorption and impact resistance Ability, the effect of improving wear resistance

Inactive Publication Date: 2019-07-23
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] To sum up, the existing problems in the prior art are: there are few studies on the corrosion of high-chromium cast iron in the prior art, and the corrosion resistance is poor; the existing preparation process uses one-time heat treatment, and the heat treatment temperature is high, which cannot guarantee High chromium cast iron strength; one-time sintering, or two sintering temperatures at the same temperature, is not conducive to the potential of high-chromium cast iron

Method used

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  • Anti-corrosion wear-resistance high chrome cast iron alloy and preparing method thereof
  • Anti-corrosion wear-resistance high chrome cast iron alloy and preparing method thereof

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preparation example Construction

[0041] Such as figure 1 As shown, the preparation method of the anti-corrosion and wear-resistant high-chromium cast iron alloy provided by the embodiments of the present invention specifically includes:

[0042] S101, mixing carbon, silicon, chromium, manganese, vanadium, phosphorus, nickel, molybdenum, nitrogen, zinc, copper, iron and unavoidable impurities in a certain proportion, and fully melting and mixing;

[0043]S102, after 60-80% of the charge in the furnace is melted, add sulfur powder equivalent to 0.01-0.03% of its weight, and water atomize to prepare pre-alloyed powder;

[0044] S103, adding a molding agent to the obtained pre-alloyed powder, and pressing to obtain a high-chromium cast iron alloy blank;

[0045] S104, subjecting the obtained compact to variable temperature sintering, the upper limit sintering temperature is 1250-1280°C, the holding time is 10-30min, and then rapidly lower the temperature to the lower limit sintering temperature 1220-1245°C, and ...

Embodiment 1

[0060] In the first step, 0.8% carbon, 0.6% silicon, 18% chromium, 2.2% manganese, 0.2% vanadium, 0.01% phosphorus, 0.4% nickel, 0.2% molybdenum, 0.2% nitrogen, 0.06% of zinc, 14% of copper, 63% of iron and 0.33% of waste electrode blocks and scrap steel are fully melted and mixed;

[0061] In the second step, after 80% of the charge in the furnace is melted, add sulfur powder equivalent to 0.01% of its weight, and water atomize to obtain a pre-alloyed powder;

[0062] The third step is to add 0.8wt% styrene-butadiene rubber (SG) to the obtained pre-alloyed powder, and press it with a unidirectional steel mold, the pressure is 200MPa, and the holding time is 60s to obtain a high-chromium cast iron alloy blank;

[0063] The fourth step is to carry out variable temperature sintering of the obtained green compact, the upper limit sintering temperature is 1250°C, the holding time is 10 minutes, and then quickly lower the temperature to the lower limit sintering temperature 1220°C,...

Embodiment 2

[0068] In the first step, 1.2% carbon, 0.8% silicon, 22% chromium, 3.2% manganese, 0.6% vanadium, 0.03% phosphorus, 0.8% nickel, 0.5% molybdenum, 0.4% nitrogen, 0.08% zinc, 10% copper, 60% iron and 0.39% scrap electrode block and scrap steel are fully melted and mixed;

[0069] In the second step, after 60% of the charge in the furnace is melted, add sulfur powder equivalent to 0.03% of its weight, and water atomize to obtain a pre-alloyed powder;

[0070] The third step is to add 1.5wt% styrene-butadiene rubber (SG) to the obtained pre-alloyed powder, and press it with a unidirectional steel mold with a pressure of 300 MPa and a holding time of 60s to obtain a high-chromium cast iron alloy blank;

[0071] The fourth step is to carry out variable temperature sintering of the obtained green compact. The upper limit sintering temperature is 1280°C, and the holding time is 30 minutes, and then rapidly lowers the temperature to the lower limit sintering temperature of 1245°C, and ...

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Abstract

The invention belongs to the technical field of wear-resisting metal materials, and discloses an anti-corrosion wear-resistance high chrome cast iron alloy and a preparing method thereof. The method comprises the steps of raw material preparing, atomizing mixing powder making, mould pressing blank making, variable temperature sintering, heat treatment cooling, mixture treatment, and finished product making. Through adjusting of the raw material proportion of the blank of the high chrome cast iron alloy, the corrosion resistance and impact resistance are improved, before casting, sulphur powderis used for hardening and tempering, in cooperation with the heat treatment process, the phenomenon that much carbide is precipitated from austenite is avoided, a condensation structure is fine, thegood mechanical property is achieved, the matrix structure, the graphite size, the graphite shape and graphite distribution are improved, corrosion resistance is obviously improved, and the hardness of the high chrome cast iron alloy blank can be improved; and through the mixture, the surface of the high chrome cast iron alloy is modified, the absorption impact resistance capacity of the high chrome cast iron alloy is improved while the hardness of the high chrome cast iron alloy is ensured, and accordingly the wear resistance is improved.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant metal materials, in particular to a corrosion-resistant and wear-resistant high-chromium cast iron alloy and a preparation method thereof. Background technique [0002] Currently, the closest prior art: [0003] At present, the ordinary white cast iron is almost eliminated, and it is replaced by alloy white cast iron. Due to the abundant and cheap chromium resources in China, chromium has become the main additive element of alloy white cast iron. The high chromium cast iron that people often say mainly refers to high chromium molybdenum white cast iron, which can be divided into Cr 15 and Cr 20 Two types, the former is used to withstand general impact wear, while the latter is used for high impact wear and wear-resistant parts with large thickness. High-chromium cast iron with a chromium content of more than 30% is generally used for heat-resistant or corrosion-resistant parts. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/58C22C38/46C22C38/44C22C38/42B22F9/08B22F3/10B22F3/24C23C24/10
CPCB22F3/1017B22F3/24B22F9/082B22F2003/242B22F2003/248B22F2998/10C22C38/001C22C38/002C22C38/02C22C38/42C22C38/44C22C38/46C22C38/58C23C24/103B22F3/02
Inventor 王荣峰吴瑞瑞王恒涛
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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