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Non-molybdenum non-nickel middle chrome wear resistant steel casting and heat treatment method thereof

A heat treatment method and steel casting technology are applied in the field of metal wear-resistant materials, which can solve the problem of high production cost and achieve the effects of good hardness uniformity, high hardness and low production cost

Inactive Publication Date: 2009-07-22
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a molybdenum-nickel medium-chromium wear-resistant steel casting and its heat treatment method, aiming at solving the problem of high production cost caused by the molybdenum and nickel contained in the wear-resistant steel in the prior art

Method used

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  • Non-molybdenum non-nickel middle chrome wear resistant steel casting and heat treatment method thereof
  • Non-molybdenum non-nickel middle chrome wear resistant steel casting and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The steps of the heat treatment method for smelting the non-molybdenum-nickel medium-chromium wear-resistant steel castings provided by the present invention with a 500 kg intermediate frequency induction electric furnace are:

[0060] ① Heat and melt scrap steel, pig iron, ferrochrome, ferrosilicon and ferromanganese;

[0061] ②After adjusting the composition in front of the furnace, the temperature is raised to 1592℃, pre-deoxidized with silicon-calcium alloy, and finally deoxidized with aluminum, and then out of the furnace. The percentage of silicon-calcium alloy added to the mass of molten steel is 0.28%, and the amount of aluminum added to molten steel is 0.28%. The mass percentage is 0.11%;

[0062] ③Crush the yttrium-based rare earth, titanium-iron, boron-iron, and vanadium-nitrogen alloys into small pieces with a particle size of less than 12mm, dry them below 220 ℃, place them at the bottom of the ladle, and use the ladle flushing method to perform compound modifi...

Embodiment 2

[0071] The steps of the heat treatment method for smelting the molybdenum-nickel-free medium-chromium wear-resistant cast steel provided by the present invention in a 1000 kg intermediate frequency induction electric furnace are:

[0072] ① Heat and melt scrap steel, pig iron, ferrochrome, ferrosilicon and ferromanganese;

[0073] ② Adjust the composition in front of the furnace and raise the temperature to 1619℃, pre-deoxidize with silicon-calcium alloy, and finally deoxidize with aluminum, and then out of the furnace. The percentage of silicon-calcium alloy added to molten steel mass is 0.18%. The mass percentage is 0.15%;

[0074] ③Crush the yttrium-based rare earth, titanium-iron, boron-iron, and vanadium-nitrogen alloys into small pieces with a particle size of less than 12mm, dry them below 220 ℃, place them at the bottom of the ladle, and use the ladle flushing method to perform compound modification treatment on the molten steel ;

[0075] ④The casting is made of sand cast...

Embodiment 3

[0084] The 750 kg intermediate frequency induction electric furnace is used to melt the molybdenum-nickel-free medium-chromium wear-resistant steel castings provided by the present invention, and the heat treatment steps are as follows:

[0085] ① Heating and melting scrap steel, pig iron, ferrochrome, ferrosilicon and ferromanganese;

[0086] ② Adjust the composition in front of the furnace and raise the temperature to 1604℃, pre-deoxidize with silicon-calcium alloy, and finally deoxidize with aluminum, and then come out of the furnace. The percentage of silicon-calcium alloy added to the mass of molten steel is 0.22%, and the added amount of aluminum is compared with molten steel. The mass percentage is 0.13%;

[0087] ③Crush the yttrium-based rare earth, titanium-iron, boron-iron, and vanadium-nitrogen alloys into small pieces with a particle size of less than 12mm, dry them below 220 ℃, place them at the bottom of the ladle, and use the ladle flushing method to perform compoun...

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Abstract

The invention belongs to the technical field of metal wear-resistant materials and particularly relates to a wear-resistant casting steel part which is free of molybdenum-nickel and medium-chromium and a heat treatment method thereof. The wear-resistant casting steel part which is free of molybdenum-nickel and medium-chromium comprises the components of the following mass percentages: 0.35 to 0.65 wt percent of C, 5.0 to 7.0 wt percent of Cr, 0.003 to 0.006 wt percent of B, 0.2 to 0.5 wt percent of Si, 0.8 to 1.0 wt percent of Mn, 0.03 to 0.08 wt percent of Y, 0.05 to 0.15 wt percent of Ti, 0.04 to 0.08 wt percent of V, 0.02 to 0.05 wt percent of N, less than 0.04 wt percent of S, less than 0.05 wt percent of P and the balance of ferrite. The wear-resistant casting steel part which is free of molybdenum-nickel and medium-chromium can be manufactured by an electric furnace using a sand casting. The invention carries out step quenching by using two types of quenching oils with different temperatures, thus leading to depth of more than 60mm of the quenching full hardening layer of the cast steel, high hardness, good uniformity of the hardness, and no cracks in the heat treatment. The casting steel is free of expensive alloying elements such as molybdenum or nickel, raw materials resource is rich, the manufacture cost is low and economic benefit is good.

Description

Technical field [0001] The invention belongs to the technical field of metal wear-resistant materials, and particularly relates to a molybdenum-nickel-free medium-chromium wear-resistant cast steel and a heat treatment method thereof. Background technique [0002] Abrasion is a common form of material failure in the metallurgy, mining, electric power, machinery, petroleum, chemical, building materials, and military industries. The development of new wear-resistant materials to meet the needs of these sectors has always been a topic of constant concern to materials researchers. [0003] Chinese invention patent CN1150979 discloses a high-chromium wear-resistant cast steel. Its chemical composition and weight percentage are as follows: C: 1.2-2.5wt%, Mn≤0.6wt%, Si≤0.6wt%, Cr: 11.5-13.5 wt%, Mo: 0.7-1.2wt%, Cu: 0.5-1.0wt%, V: 3.5-4.5wt%, Re: 0.03-0.05wt%, S: ≤0.06wt%, P≤0.06wt%, the rest is Fe, not only has high hardness, but also high strength and toughness. It has a wide range of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C33/04C21C7/06B22D27/20C21D1/18
Inventor 杜建铭符寒光
Owner SHENZHEN UNIV
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