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Manufacturing method of medium-carbon alloy cast steel shots

A manufacturing method and medium carbon alloy technology are applied in the manufacturing field of medium carbon alloy cast steel shot, which can solve the problems of short cycle life, low hardness of medium carbon cast steel shot, insufficient toughness, etc., to avoid cracks, improve toughness, Good abrasion resistance

Active Publication Date: 2011-11-30
淄博大亚金属科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Experiments have found that when tempering at a higher temperature in this process, the hardness of the prepared medium carbon cast steel shot is lower; when tempering at a lower temperature, the hardness is high but the toughness is obviously insufficient, and the cycle life is short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Raw material composition with the following mass percentage of raw materials: C: 0.35%, Si: 0.11%, Mn: 0.45%, Cr: 1.2%, S: 0.015%, P: 0.020%, the rest is Fe and unavoidable impurities;

[0019] Melting: The raw material composition of the constituent elements is distributed according to the ingredients, and after the ratio is good, it is melted into molten steel in an electric arc furnace, and then poured into a tundish, using an aluminum deoxidizer;

[0020] Forming: Pour the deoxidized molten steel into a high-speed rotating centrifugal disc, throw it out and fall into the cooling water pool under the action of centrifugal force, then fish out and dry to obtain the formed cast steel shot;

[0021] Heat treatment: Heating the formed cast steel shot to 880°C for 20 minutes, then water-cooled and quenched, and then tempered at 400°C for 60 minutes. After tempering, use steel plate vibrating sieve water cooling method to quickly cool down to obtain medium carbon alloy cas...

Embodiment 2

[0024] Raw material composition with the following mass percentage of raw materials: C: 0.40%, Si: 0.12%, Mn: 0.5%, Cr: 0.9%, S: 0.012%, P: 0.016%, the rest is Fe and unavoidable of impurities.

[0025] Melting: The raw material composition of the constituent elements is distributed according to the ingredients, smelted into molten steel in an intermediate frequency induction furnace, and then poured into the tundish, using an aluminum deoxidizer;

[0026] Forming: Pour the deoxidized molten steel into a high-speed rotating centrifugal disc, throw it out under the action of centrifugal force and drop it into the cooling water pool, then fish it out and dry it to get cast steel shot;

[0027] Heat treatment: Heat the formed cast steel shot to 870°C for 40 minutes, then water-cooled and quenched, and then tempered at 450°C for 50 minutes. After tempering, use steel plate vibrating screen water cooling method to quickly cool down to obtain medium carbon alloy cast steel pill.

...

Embodiment 3

[0030] Raw material composition using the following mass percentages of raw materials: C: 0.45%, Si: 0.20%, Mn: 0.5%, Cr: 1.2%, S: 0.014%, P: 0.014%, the rest is Fe and unavoidable of impurities.

[0031] Melting: The raw material composition of the constituent elements is distributed according to the ingredients, smelted into molten steel in an intermediate frequency induction furnace, and then poured into the tundish, and deoxidized with an aluminum-containing composite deoxidizer;

[0032] Forming: Pour the deoxidized molten steel into a high-speed rotating centrifugal disc, throw it out under the action of centrifugal force and drop it into the cooling water pool, then fish it out and dry it to get cast steel shot;

[0033] Heat treatment: Heat the formed cast steel shot to 860°C for 30 minutes, then water-cooled and quenched, then tempered at 350°C for 40 minutes, after tempering, use steel plate vibrating sieve water cooling method to quickly cool down to obtain medium c...

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Abstract

The invention relates to medium-carbon alloy cast steel shots and a manufacturing method thereof, which is characterized in that, each medium-carbon alloy cast steel shot comprises the following chemical components in percentage by mass: 0.35 percent of carbon, 0.11 percent of silicon, 0.45 percent of manganese, 1.2 percent of chrome, 0.015 percent of sulfur, 0.020 percent of phosphor and the balance of iron and inevitable impurities. The manufacturing process comprises the following steps of: mixing and smelting, namely, smelting the raw material composition mixed proportionally into liquid steel, pouring the liquid steel into a tundish and performing deoxygenation by adopting an deoxidant; preparing shots by a centrifugally forming method, namely, pouring deoxygenized liquid steel into a centrifugal disc which rotates at a high speed, throwing out the liquid steel under the action of a centrifugal force to make the liquid steel fall into a cooling water pool, and taking the liquid steel out and drying the cooled steel to obtain formed cast steel shots; and performing heat treatment, namely, heating the formed cast steel shots until the temperature reaches 860 to 880 DEG C, performing cold quenching after keeping the temperature for 20 to 40 minutes, tempering for 40 to 80 minutes at the temperature of between 350 and 500 DEG C, and after tempering, cooling rapidly by a steel plate vibrating screen water cooling method to produce the medium-carbon alloy cast steel shots. The medium-carbon alloy cast steel shots and the manufacturing method thereof have the advantages of guaranteeing the high rigidity of the steel shots, avoiding crack generated in the centrifugally forming process and the heating tempering process, improving the toughness and the like.

Description

technical field [0001] A method for manufacturing medium-carbon alloy cast steel shot belongs to the technical field of metal abrasives, and specifically relates to a medium-carbon alloy cast steel shot suitable for surface shot blasting, shot blast cleaning and strengthening of steel materials, castings, forgings, and heat-treated parts Manufacturing method. Background technique [0002] At present, cast steel shot is widely used in surface cleaning, rust removal, paint removal and strengthening of parts in machinery, shipbuilding, automobile, aircraft and container manufacturing industries. With the increasing requirements for the surface quality of structural parts in aerospace, aviation and special fields and the enhancement of people's awareness of environmental protection, the research and development of special steel shots has become a research focus in recent years. A large number of steel parts that were originally treated with pickling are now mostly replaced by s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C33/04B22D13/00C21D1/18
Inventor 殷凤仕韩庆吉蒋振峰
Owner 淄博大亚金属科技股份有限公司
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