Cast steel shot with low-carbon martensite structure and preparation process for cast steel shot

A technology of low-carbon martensite and cast steel shot, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of increased raw material cost and process cost, consumption of precious metal resources, poor fluidity of molten steel, etc., and achieve a reduction in broken rate , raw material cost control, and the effect of yield improvement

Active Publication Date: 2021-12-14
DALIAN JIAOTONG UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it is very difficult to further increase the service life of the above cast steel shot: when adjusting the chemical composition, especially the carbon content, the strength and toughness of the cast steel shot are a pair of contradictions, that is, when the strength increases, plasticity and The toughness will be reduced, and vice versa, so it is often difficult to take care of both; therefore, how to improve the strength and toughness of cast steel shots at the same time, or to make the strength and toughness of cast steel shots have a reasonable coordination has always been to further improve the use of steel shots. The problem of service life needs to be solved urgently; and, the actual production proves that the carbon content of low-carbon cast steel shot is low

Method used

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  • Cast steel shot with low-carbon martensite structure and preparation process for cast steel shot
  • Cast steel shot with low-carbon martensite structure and preparation process for cast steel shot
  • Cast steel shot with low-carbon martensite structure and preparation process for cast steel shot

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045] Example 1

[0046] The carbon content of the two steel balls of the present invention, the chemical composition were:

[0047] ①0.29% C, 2.05% Mn, 0.37% Si, 0.08% P, 0.039% S, the balance of the alloy elements into the material when Fe and unavoidable impurities, and smelting;

[0048] ②0.28% C, 1.98% Mn, 0.37% Si, 0.02% Nb, 0.06% P, 0.037% S, when the balance Fe and inevitable impurities, and smelting of alloying elements into the material.

[0049] The preparation step comprises:

[0050] . S1 in accordance with the feed weight ratio was added to the medium frequency induction furnace smelting, smelting temperature of 1650 ~ 1750 ℃, adjusting the chemical composition of the smelting process, until the required chemical composition of the molten steel reached;

[0051] . S2 continuously to the smelting molten steel poured into a good high-speed centrifugal molding machine, and thrown into the pool below 40 ℃ under centrifugal force to obtain the solidification of the molde...

Example Embodiment

[0057] Example 2

[0058] The chemical components of cast steel pills according to the present invention are:

[0059] 110.46% C, 1.63% Mn, 0.47% Si, 0.11% Ti, 0.07% p, 0.032% s, the balance of alloy elements brought by Fe and inevitable impurities and smelting.

[0060] 20.45% C, 1.59% Mn, 0.47% Si, 0.11% Ti, 0.05% Nb, 0.07% p, 0.031% S, the balance of alloy elements brought into from the inexvasive impurities and the Irrigration of the materials.

[0061] The preparation steps include:

[0062] S1. The raw material is added to the medium-frequency induction electric furnace in accordance with the weight ratio, and the smelting temperature is 1650 to 1750 ° C, and the chemical composition is adjusted during the smelting process until the steel water reaches the requirements of chemical components;

[0063] S2. Smelting the steel water is continuously cast into the high-speed centrifugal molding machine, and the molded cast steel pill is solidified to the pool below 40 ° C under t...

Example Embodiment

[0069] Example 3

[0070] According to the two high-carbon content of the present invention, the chemical components are:

[0071] 110.71% C, 1.25% Mn, 0.31% Si, 0.12% Ti, 0.07% P, 0.029% S, margin are all alloy elements brought by Fe and inevitable impurities and smelting.

[0072] 20.69% C, 1.22% Mn, 0.30% Si, 0.12% Ti, 0.08% Nb, 0.06% p, 0.029% s, the balance of alloy elements brought into from the inevitable impurities and the smelting of raw materials.

[0073] The preparation steps include:

[0074] S1. The raw material is added to the medium-frequency induction electric furnace in accordance with the weight ratio, and the smelting temperature is 1650 to 1750 ° C, and the chemical composition is adjusted during the smelting process until the steel water reaches the requirements of chemical components;

[0075] S2. Continuously pouring the smelted steel continuously into the high-speed centrifugal mold, and the molded cast steel pill is solidified in a pool of 40 ° C under th...

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Abstract

The invention discloses a cast steel shot with a low-carbon martensite structure and a preparation process for the cast steel shot. The cast steel shot comprises the following chemical elements in percentage by mass: 0.25-0.75% of C, greater than 1.2% and less than or equal to 2.10% of Mn, 0.25-0.50% of Si, greater than 0.05% and less than or equal to 0.10% of P, less than 0.05% of S and the balance Fe, inevitable impurities and alloy elements brought in by raw materials during smelting. In the preparation process, a high-temperature or ultra-high-temperature quenching heating temperature higher than a conventional quenching heating temperature is adopted, and a quenched metallographic structure is the low-carbon martensite structure containing austenite films among laths. The cast steel shot has the advantages of being higher in obdurability, better in use performance, simple in preparation process, high in yield, good in quality and price advantages, environmentally-friendly and wide in application.

Description

technical field [0001] The invention relates to cast steel shots, in particular to a cast steel shot with a low-carbon martensitic structure and a preparation process thereof. Background technique [0002] There are two main methods of preparing shot blasting steel shot and shot blasting steel shot used to clean the surface of metal (casting) parts, improve the surface quality of metal (casting) parts, or strengthen the surface of metal parts: one is to use scrap steel and other raw materials After smelting and refining, the steel shot obtained by granulating high-temperature molten steel with a certain chemical composition by atomization or centrifugal method is called cast steel shot; Steel wire, the steel shot obtained by cutting into sections and subsequent finishing, is called cut wire shot. Among them, the preparation method of cast steel shot has the characteristics of simple preparation process, low cost, small performance deviation, and is especially suitable for m...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C22C38/60C21D1/18C21D6/00C21D9/36C22C33/04
CPCC22C38/04C22C38/02C22C38/60C22C38/002C22C38/14C22C38/12C22C33/04C21D1/18C21D6/005C21D6/008C21D9/36C21D2211/001C21D2211/008
Inventor 丁志敏王小帆马祎泽李鸿娟田如锦严峰刘桂林
Owner DALIAN JIAOTONG UNIVERSITY
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