CN105018859A - Wear-resisting bainite cast steel and preparation method thereof - Google Patents
Wear-resisting bainite cast steel and preparation method thereof Download PDFInfo
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- CN105018859A CN105018859A CN201510469309.XA CN201510469309A CN105018859A CN 105018859 A CN105018859 A CN 105018859A CN 201510469309 A CN201510469309 A CN 201510469309A CN 105018859 A CN105018859 A CN 105018859A
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Abstract
The invention relates to wear-resisting bainite cast steel and a preparation method thereof, and belongs to the field of low-alloy wear-resisting cast steel. Si, Mn and Cr are used as the main alloy elements, a small quantity of Ni, Cu and Mo are added, a trace of B, Re, Ti and other alloy elements are added, and the balance is Fe. The conventional steel making process is adopted for smelting, after being molded through casting, steel is subjected to secondary normalizing for refining of as-cast grains, and after thermal treatment, the steel is heated to be austenitized and then subjected to isothermal quenching. According to the produced wear-resisting cast steel, after the isothermal quenching, the texture is carbide-free bainite+ martensite/retained austenite. The tensile strength of the wear-resisting cast steel is larger than 1200 Mpa, the hardness is larger than 40 (HRC), and the ballistic work KV2 of a V-shaped notch is larger than 30 J. The wear-resisting cast steel is good in toughness and wear resistance, has certain corrosion resistance, and is used for manufacturing cast steel wear-resisting pieces under the weak corrosion environment like a mine, and therefore the service life of a product is greatly prolonged.
Description
Technical field
The present invention relates to a kind of wear-resisting Bainite Casting Steel and preparation method thereof, belongs to low-alloy wear-resistant steel field.
Background technology
Coal mine machinery equipment underground work bad environments, great majority work under the operating mode of high speed, heavy duty, vibration, impact, friction, weares and teares, fracture is the principal mode that coal machine equipment lost efficacy, and underground air humidity, and containing SO
2, H
2the obnoxious flavoures such as S, NO, most machinery is directly exposed in air, and air corrosion exacerbates again wearing and tearing, the fracture failure of component.This harsh working conditions proposes very high requirement to material property, with the wear-resisting spare part that traditional abrasion-resistant cast steel material manufactures, in down-hole, some operating mode uses and is restricted, as: high manganese austenite cast steel, strong work hardening is produced under high pressure and impact load, but impressed pressure or surging force very little time, its work hardening feature is not obvious, and wear resistance is not in full use; The hardness strength of martensite wear resistant cast steel and lower bainite/martensite multi-phase wear-resistant cast steel is high, but toughness is relatively poor.
Coal mine machinery equipment wear-resistant cast steel parts, not only requires to have higher intensity, toughness, also requires to possess excellent wear resisting property and etch resistant properties simultaneously.
Summary of the invention
The object of this invention is to provide a kind of wear-resisting Bainite Casting Steel and preparation method thereof, this wearable cast steel combination of strength and toughness and wear resisting property excellent, with Si, Mn, Cr for main alloy element, add a small amount of Ni, Cu, MO, the alloying elements such as trace B, Re, Ti, can be used for casting various low-alloy wear-resistant steel part, bear compared with the wear-resistant cast steel parts under HI high impact, microcorrosion environment especially for such as underground coal mine.
The preparation method of carbide-free Bainite/martensite/austenite multi-phase wear-resistant cast steel that the present invention proposes, comprise the following steps: (1) smelting chemical composition is: 0.1 ~ 0.5%C, 0.8 ~ 2.0%Mn, 0.8 ~ 2.0%Si, 1.0 ~ 3.0%Cr, 0.4 ~ 1.0%Ni, 0.1 ~ 0.5%Mo, 0.4 ~ 1.0%Cu, 0.002 ~ 0.005%B, trace Re, Ti, V, all the other are Fe, casting.(2) by 850 DEG C ~ 880 DEG C secondary normalizing crystal grain thinnings after DEG C normalizing of 950 DEG C, above-mentioned cast steel ~ 1050.(3) above-mentioned cast steel is heated to 330 ~ 380 DEG C of isothermal processes after the insulation of 840 DEG C ~ 860 DEG C austenitizings, isothermal soaking time 3 ~ 4.5 hours, air cooling of coming out of the stove.
Adding the elements such as Si, Mn, Ni, Cr is the major reason obtaining carbide-free Bainite, and Si can significantly improve austenitic stability and stop Carbide Precipitation; Add copper in the present invention, solidity to corrosion and the intensity of steel can be improved, improve weldability, formability and machinability, when copper and Ni, Gr elements compounding use, improve the better effects if of atomospheric corrosion performance.
The metallographic structure of abrasion-resistant cast steel material of the present invention after the thermal treatment+isothermal quenching of secondary normalizing crystal grain thinning is: carbide-free Bainite (BF)+martensite (M)+residual austenite (A), its volume percent is roughly respectively: 80%, 10%, 10%, wherein martensite is Super High Carbon martensite, and residual austenite is rich carbon austenitic.Residual austenite improves the toughness of material; It is martensite and Super High Carbon martensite to the provide protection that matrix weares and teares is the major cause that this wearable cast steel to have better wear resistance than traditional tempered martensite steel under same rigidity condition that austenitic transformation is brought out in friction; A conventional austenitizing normalizing of high temperature normalizing+secondary can eliminate the thick Structure Inheritance of as cast condition, crystal grain thinning, obtains good combination of strength and toughness.The tensile strength > 1200Mpa of material, hardness > 40 (HRC), V-notch ballistic work KV2 > 30J.
The invention has the beneficial effects as follows, according to carbide-free Bainite provided by the invention/martensite/austenite multi-phase wear-resistant cast steel preparation method manufactured by wear-resistant cast steel parts, it has higher combination of strength and toughness, wear resistance is good, in particular under the weak corrosive environment operating modes such as mine, reach more than 1.5 times of import wear-resisting steel plate (rolling) HARDOX450 its work-ing life, can be used for the wear-resistant cast steel parts manufacturing different shape complexity.
Accompanying drawing explanation
Carbide-free Bainite/martensite/austenite metallographic structure figure that Fig. 1 observes after isothermal quenching for the abrasion-resistant cast steel material that the present invention produces under opticmicroscope (OM);
Carbide-free Bainite/martensite/austenite micro-organization chart that Fig. 2 observes after isothermal quenching for the abrasion-resistant cast steel material that the present invention produces under scanning electronic microscope (SEM).
Embodiment
The preparation method of carbide-free Bainite/martensite/austenite multi-phase wear-resistant cast steel that the present invention proposes, comprise the following steps: (1) smelting chemical composition is: 0.1 ~ 0.5%C, 0.8 ~ 2.0%Mn, 0.8 ~ 2.0%Si, 1.0 ~ 3.0%Cr, 0.4 ~ 1.0%Ni, 0.1 ~ 0.5%Mo, 0.4 ~ 1.0%Cu, 0.002 ~ 0.005%B, trace Re, Ti, all the other are Fe, casting.(2) by 850 DEG C ~ 880 DEG C secondary normalizing crystal grain thinnings after DEG C normalizing of 950 DEG C, above-mentioned cast steel ~ 1050.(3) above-mentioned cast steel is heated to 330 ~ 380 DEG C of isothermal processes after the insulation of 840 DEG C ~ 860 DEG C austenitizings, isothermal soaking time 3 ~ 4.5 hours, air cooling of coming out of the stove.
Below introduce embodiments of the invention:
| Embodiment | C | Mn | Si | Cr | Ni | Cu | Mo | Re | Ti | V | S | P | Al | B |
| NO.1 | 0.32 | 1.26 | 0.80 | 1.41 | 0.45 | 0.63 | 0.32 | 0.012 | 0.013 | 0.015 | 0.007 | 0.031 | 0.03 | 0.0015 |
| NO.2 | 0.28 | 0.99 | 0.88 | 1.36 | 0.52 | 0.63 | 0.33 | 0.019 | 0.016 | 0.011 | 0.007 | 0.030 | 0.03 | 0.0028 |
| NO.3 | 0.31 | 0.96 | 1.14 | 1.34 | 0.57 | 0.60 | 0.30 | 0.020 | 0.031 | 0.012 | 0.008 | 0.022 | 0.05 | 0.0031 |
The preparation method of above-described embodiment is as follows:
Embodiment 1
(1), after smelting by conventional smelting process, use sand mould casting method castable, and pour into a mould Kiel coupon;
(2) above-mentioned cast steel is heated to air cooling (normalizing) after 950 DEG C of austenitizing held for some time;
(3) secondary normalizing crystal grain thinning is carried out at 860 DEG C after the normalizing of above-mentioned cast steel;
(4) above-mentioned cast steel is heated to 850 DEG C of austenitizings and is incubated 1 hour, 330 DEG C of isothermal processes, isothermal soaking time 3.5 hours, air cooling of coming out of the stove.
Embodiment 2
(1), after smelting by conventional smelting process, use sand mould casting method castable, and pour into a mould Kiel coupon;
(2) above-mentioned cast steel is heated to air cooling (normalizing) after 980 DEG C of austenitizing held for some time;
(3) secondary normalizing crystal grain thinning is carried out at 870 DEG C after the normalizing of above-mentioned cast steel;
(4) above-mentioned cast steel is heated to 860 DEG C of austenitizings and is incubated 1 hour, 350 DEG C of isothermal processes, isothermal soaking time 4.5 hours, air cooling of coming out of the stove.
Embodiment 3
(1), after smelting by conventional smelting process, use sand mould casting method castable, and pour into a mould Kiel coupon;
(2) above-mentioned cast steel is heated to air cooling (normalizing) after 1000 DEG C of austenitizing held for some time;
(3) secondary normalizing crystal grain thinning is carried out at 880 DEG C after the normalizing of above-mentioned cast steel;
(4) above-mentioned cast steel is heated to 860 DEG C of austenitizings and is incubated 40 minutes, 340 DEG C of isothermal processes, isothermal soaking time 4 hours, air cooling of coming out of the stove.
Claims (1)
1. wear-resisting Bainite Casting Steel and preparation method thereof, is characterized in that the method comprises the following steps:
(1) smelting chemical composition is: 0.1 ~ 0.5%C, 0.8 ~ 2.0%Mn, 0.8 ~ 2.0%Si, 1.0 ~ 3.0%Cr, 0.4 ~ 1.0%Ni, 0.1 ~ 0.5%Mo, 0.4 ~ 1.0%Cu, 0.002 ~ 0.005%B, trace Re, Ti, V, all the other are Fe, casting;
(2) by 850 DEG C ~ 880 DEG C secondary normalizing crystal grain thinnings after DEG C normalizing of 950 DEG C, above-mentioned cast steel ~ 1050;
(3) above-mentioned cast steel is heated to 330 ~ 380 DEG C of isothermal processes after the insulation of 840 DEG C ~ 860 DEG C austenitizings, isothermal soaking time 3 ~ 4.5 hours, air cooling of coming out of the stove.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105734408A (en) * | 2016-04-30 | 2016-07-06 | 贵州惠沣众一机械制造有限公司 | High-strength toughness carburized and air-cooled steel for tunneling tool and production method thereof |
| CN106555035A (en) * | 2016-11-01 | 2017-04-05 | 钢铁研究总院 | A kind of Technology for Heating Processing of steel-casting impact flexibility that raising 3Cr is anti-corrosion |
| CN109252099A (en) * | 2018-10-30 | 2019-01-22 | 河北冀凯铸业有限公司 | A kind of high-toughness high-strength cast steel wear-resistant material and preparation method thereof |
| CN109252098A (en) * | 2018-10-30 | 2019-01-22 | 河北冀凯铸业有限公司 | A kind of block cast intermediate channel high-strength, high-anti-friction Bainite Casting Steel and its preparation process |
| CN109797349A (en) * | 2019-03-26 | 2019-05-24 | 湖南力神新材料科技有限公司 | High-carbon Austria Bei Zhugang, preparation method and mining machinery wear-resistant material |
| CN111621626A (en) * | 2020-07-21 | 2020-09-04 | 齐齐哈尔英格机械有限公司 | Heat treatment process method for eliminating as-cast structure of ZG25CrNiMo cast low alloy steel |
| CN111647809A (en) * | 2020-05-27 | 2020-09-11 | 宁夏天地奔牛实业集团有限公司 | Novel middle groove material and preparation method of casting thereof |
| CN111809022A (en) * | 2020-07-21 | 2020-10-23 | 齐齐哈尔英格机械有限公司 | Heat treatment process method for improving mechanical property of ZG25CrNiMo cast low alloy steel |
| CN112458261A (en) * | 2020-11-24 | 2021-03-09 | 高博扬 | Preparation method of high-strength steel and high-strength steel |
| CN112662957A (en) * | 2020-12-09 | 2021-04-16 | 暨南大学 | Bainite wear-resistant cast steel with strong wear hardening capacity and preparation method and application thereof |
| CN112695253A (en) * | 2020-12-22 | 2021-04-23 | 江西耐普矿机股份有限公司 | Carbide-containing high-strength high-toughness bainite wear-resistant steel and preparation method thereof |
| CN114480797A (en) * | 2022-01-27 | 2022-05-13 | 石狮市汇星机械有限公司 | Heat treatment process method for producing knitting machine cam by using GCr15 steel |
| CN114717389A (en) * | 2022-04-18 | 2022-07-08 | 燕山大学 | Wear-resistant low-temperature bainite hot-work die steel and preparation method thereof |
| WO2022237263A1 (en) * | 2021-05-12 | 2022-11-17 | 江西耐普矿机股份有限公司 | Bainite cast steel for semi-autogenous grinding mill, preparation method therefor, and bainite cast steel liner of semi-autogenous grinding mill |
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Cited By (18)
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|---|---|---|---|---|
| CN105734408A (en) * | 2016-04-30 | 2016-07-06 | 贵州惠沣众一机械制造有限公司 | High-strength toughness carburized and air-cooled steel for tunneling tool and production method thereof |
| CN106555035A (en) * | 2016-11-01 | 2017-04-05 | 钢铁研究总院 | A kind of Technology for Heating Processing of steel-casting impact flexibility that raising 3Cr is anti-corrosion |
| CN106555035B (en) * | 2016-11-01 | 2018-08-28 | 钢铁研究总院 | A kind of heat treatment process improving the anti-corrosion steel-casting impact flexibility of 3Cr |
| CN109252099A (en) * | 2018-10-30 | 2019-01-22 | 河北冀凯铸业有限公司 | A kind of high-toughness high-strength cast steel wear-resistant material and preparation method thereof |
| CN109252098A (en) * | 2018-10-30 | 2019-01-22 | 河北冀凯铸业有限公司 | A kind of block cast intermediate channel high-strength, high-anti-friction Bainite Casting Steel and its preparation process |
| CN109252098B (en) * | 2018-10-30 | 2020-06-02 | 冀凯河北机电科技有限公司 | High-strength high-wear-resistance bainite cast steel for block casting of middle groove and preparation process thereof |
| CN109797349A (en) * | 2019-03-26 | 2019-05-24 | 湖南力神新材料科技有限公司 | High-carbon Austria Bei Zhugang, preparation method and mining machinery wear-resistant material |
| CN111647809A (en) * | 2020-05-27 | 2020-09-11 | 宁夏天地奔牛实业集团有限公司 | Novel middle groove material and preparation method of casting thereof |
| CN111621626A (en) * | 2020-07-21 | 2020-09-04 | 齐齐哈尔英格机械有限公司 | Heat treatment process method for eliminating as-cast structure of ZG25CrNiMo cast low alloy steel |
| CN111809022A (en) * | 2020-07-21 | 2020-10-23 | 齐齐哈尔英格机械有限公司 | Heat treatment process method for improving mechanical property of ZG25CrNiMo cast low alloy steel |
| CN112458261A (en) * | 2020-11-24 | 2021-03-09 | 高博扬 | Preparation method of high-strength steel and high-strength steel |
| CN112662957A (en) * | 2020-12-09 | 2021-04-16 | 暨南大学 | Bainite wear-resistant cast steel with strong wear hardening capacity and preparation method and application thereof |
| CN112662957B (en) * | 2020-12-09 | 2021-09-17 | 暨南大学 | Bainite wear-resistant cast steel with strong wear hardening capacity and preparation method and application thereof |
| CN112695253A (en) * | 2020-12-22 | 2021-04-23 | 江西耐普矿机股份有限公司 | Carbide-containing high-strength high-toughness bainite wear-resistant steel and preparation method thereof |
| WO2022237263A1 (en) * | 2021-05-12 | 2022-11-17 | 江西耐普矿机股份有限公司 | Bainite cast steel for semi-autogenous grinding mill, preparation method therefor, and bainite cast steel liner of semi-autogenous grinding mill |
| CN114480797A (en) * | 2022-01-27 | 2022-05-13 | 石狮市汇星机械有限公司 | Heat treatment process method for producing knitting machine cam by using GCr15 steel |
| CN114717389A (en) * | 2022-04-18 | 2022-07-08 | 燕山大学 | Wear-resistant low-temperature bainite hot-work die steel and preparation method thereof |
| CN114717389B (en) * | 2022-04-18 | 2023-09-22 | 燕山大学 | Wear-resistant low-temperature bainite hot work die steel and preparation method thereof |
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