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Preparation method of air-cooling lower bainite/martensite complex-phase wear resistant cast steel

A martensite and bainite technology, which is applied in the field of preparation of bainite/martensitic composite wear-resistant cast steel under air cooling, can solve the problem that the accuracy of the casting product cannot be effectively guaranteed, the hardness of the steel casting product is not enough, There are many casting processes and other problems, so as to achieve the effect of strong and tough coordination and excellent wear resistance, ensuring the quality of castings and low cost.

Inactive Publication Date: 2015-07-01
QINGDAO YUGUANG PRECISION CASTING FACTORY
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AI Technical Summary

Problems solved by technology

In the current steel casting process, the finished steel castings are not hard enough and need to be further processed. Not only are there many casting processes, which affects the production capacity, but the precision of the finished castings cannot be effectively guaranteed, and the scrap rate is high.

Method used

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Embodiment

[0016] The preparation method of the bainite / martensite composite phase wear-resistant cast steel of the present embodiment comprises the following steps:

[0017] (1) After smelting by conventional steelmaking process, it is cast by sand casting or precision casting process, so that the weight percentage of each component in the cast steel is: C: 0.40wt.%; Si: 0.60wt.%; Mn: 3.00wt. .%; Cr: 0.50wt.%; P: 0.03wt.%; S: 0.03wt.%; B: 0.008wt.%; rare earth Ce: 0.20wt.%; the rest is Fe;

[0018] (2) Heating the cast steel above to 880°C for austenitization, keeping the temperature for 3 hours, then cooling the furnace to room temperature for annealing;

[0019] (3) Heat the cast steel above to 850°C for austenitization, keep it warm for 2 hours, and then air-cool or air-cool to 150°C;

[0020] (4) The above-mentioned cast steel is kept at 200° C. for 2 hours for low-temperature tempering treatment.

[0021] The preparation method of bainite / martensite composite phase wear-resistant...

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Abstract

The invention discloses a preparation method of air-cooling lower bainite / martensite complex-phase wear resistant cast steel. Mn is adopted as a main alloy element; small numbers of such alloy elements as Cr, B and rare earth elements (La, Ce, Nb and Pr) are added; and the balance is Fe. The alloy elements are smelted by a conventional steelmaking process, are cast and molded, are austenitized and air-cooled or forced-air-cooled, are heated and insulated, and are tempered with low temperature. The structure of the produced wear resistant cast steel after the air cooling consists of lower bainite / martensite and a small number of granular bainite. The hardness of the cast steel is higher than 50 (HRC); and the no-gap impact energy AK is higher than 50 J. The wear resistant cast steel has the advantages of low alloy element content, excellent toughness fit and wear resistance, simple process and low cost; the preparation method can be used for manufacturing various low-alloy wear resistant cast steel parts; and in particular, the preparation method has unique advantages for the wear resistant cast steel parts with complex shape structures, large sizes and easy rupture properties in quenching.

Description

[0001] technical field [0002] The invention belongs to the technical field of casting, and in particular relates to a preparation method of air-cooled bainite / martensite composite phase wear-resistant cast steel. [0003] Background technique [0004] The casting of bainite / martensitic composite phase wear-resistant cast steel usually uses Mn as the main alloying element, adding a small amount of alloying elements such as Cr, B and rare earth elements (La, Ce, Nb, Pr), and the rest is Fe. In the current steel casting process, the finished steel castings are not hard enough and need to be further processed. Not only are there many casting processes, which affects the production capacity, but the precision of the finished castings cannot be effectively guaranteed, and the scrap rate is high. [0005] Contents of the invention [0006] In order to overcome the above-mentioned technical problems existing in the prior art field, the purpose of the present invention is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38C21D6/00
Inventor 陈玉光
Owner QINGDAO YUGUANG PRECISION CASTING FACTORY
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