CN101880828B - Preparation method of low-alloy manganese martensite wear resistant cast steel - Google Patents
Preparation method of low-alloy manganese martensite wear resistant cast steel Download PDFInfo
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- CN101880828B CN101880828B CN201010228506XA CN201010228506A CN101880828B CN 101880828 B CN101880828 B CN 101880828B CN 201010228506X A CN201010228506X A CN 201010228506XA CN 201010228506 A CN201010228506 A CN 201010228506A CN 101880828 B CN101880828 B CN 101880828B
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Abstract
The invention relates to a preparation method of low-alloy manganese martensite wear resistant cast steel, which belongs to the technical field of low-alloy wear resistant cast steel preparation. The method adopts Mn as the main alloy element, and adds a small amount of Si, Cr, Cu, B and rare earth elements (La, Ce, Nb, Pr) and other alloy elements, and the balance of Fe. The method adopts a conventional steelmaking process to smelt, casts, forms, water quenches after austenitizing, heats, insulates heat and tempers at low temperature. The produced wear resistant cast steel is organized into tempered martensite after being water quenched and tempered. The tensile strength Rm of the cast steel is more than 1800MPa, the regulated non-proportional extension strength Rp0.2 is more than 1600MPa, the elongation after break A is more than 5 percent, the unnotched impact toughness aK is more than 150J/cm<2> and the U-shaped notch impact energy aKU is more than 20J/cm<2>. The wear resistant cast steel has the advantages of low alloy element content, strong toughness and wear resistance, simple process and low cost, and can be used for manufacturing bucket teeth, hammers, tooth plates, linings, crawler boards and other wear resistant cast steel.
Description
Technical field
The present invention relates to a kind of preparation method of low-alloy manganese martensite wear resistant cast steel, belong to the low-alloy wear-resistant steel preparing technical field.
Background technology
In industrial and agricultural production, fields such as agricultural machinery, steel rolling, forging and pressing, communications and transportation, generating, mine, oil, chemical industry, weapons are very big to the demand of wearable cast steel.Low-alloy Q-tempering martensite wear resistant cast steel generally adopts noble elements such as Cr, Ni, Mo as main alloy element.Carbon content is selected 0.34～0.38wt.%, through shrend behind 850～900 ℃ of austenitizings, obtains tempered martensite 200～300 ℃ of low-temperaturetemperings then.This low-alloy Q-tempering martensite wear resistant cast steel hardness can reach more than the 50HRC, but impelling strength is very low, non-notch merit A under the normal temperature
KUsually below 50J.In order to improve its obdurability, need to add a large amount of alloying element Ni usually.The typical steel grade that this type contains Ni high-strong toughness Q-tempering martensite wear resistant cast steel is the U.S.'s " super wearable cast steel of SL ".The super wearable cast steel interalloy of SL element Cr is 1.2wt.%, and Mo is 0.5wt.%, and Ni is up to 4wt.%.Behind the super wearable cast steel casting of SL, thermal treatment process is that 1200 ℃ of homogenizing are handled, long-time timeliness after 840 ℃ of shrends and the 150 ℃ of low-temperaturetemperings, and the thermal treatment power consumption is big.Therefore, Q-tempering martensite CrNiMo wear-resistant steel alloy element is many, and cost is high, in order to obtain good combination of strength and toughness, has to consume a large amount of valuable alloying element Ni.
Summary of the invention
The objective of the invention is to propose a kind of preparation method of low-alloy manganese martensite wear resistant cast steel, employing Mn is a main alloy element, and (Nb Pr) waits alloying element for La, Ce to add a spot of Si, Cr, Cu, B and REE.Obtain tempered martensite through low-temperaturetempering behind shrend or the oil quenching, to obtain the high-performance and low-cost low-alloy wear-resistant steel of good combination of strength and toughness.
The preparation method of the low-alloy manganese martensite wear resistant cast steel that the present invention proposes comprises following each step:
(1) with after the conventional process for making smelting, with sand mold casting or precision casting process casting, the weight percent of each composition is in the steel:
C：0.28～0.48wt.％；
Si：0.20～1.50wt.％；
Mn：1.85～3.50wt.％；
Cr：0.30～0.90wt.％；
Cu：0～0.90wt.％；
P：0.01～0.03wt.％；
S：0.01～0.03wt.％；
B：0～0.008wt.％；
Rare-Earth Ce: 0.05～0.25wt.%;
All the other are Fe;
(2) above-mentioned cast steel is heated to 830～900 ℃ of austenitizings, is incubated after 2-5 hour stove and is as cold as room temperature and carries out anneal;
(3) above-mentioned cast steel is heated to 830～900 ℃ of austenitizings, is incubated after 1-2 hour shrend to 80～150 ℃;
(4) above-mentioned cast steel being carried out low-temperaturetempering in 2～5 hours 200～250 ℃ of insulations handles.
The preparation method of the low-alloy manganese martensite wear resistant cast steel that the present invention proposes; Adopting cheap manganese is main alloy element; It is many to overcome low-alloy CrNiMo wear-resistant steel alloy element, and the weak point that cost is high adapts to national resource-conserving development strategy.Simultaneously, the tempered martensite that obtains of wearable cast steel quenching low-temperaturetempering of the present invention can obtain good highly malleablized and cooperates.The mechanical property of cast steel can reach: tensile strength R
m＞1800MPa, regulation disproportional extension strength R
P0.2＞1600MPa, elongation after fracture A＞5%, non-notch impact toughness a
K＞150J/cm
2, U type notch shock merit a
KU＞20J/cm
2This wear-resistant steel alloy constituent content is few, and combination of strength and toughness and wear resisting property are good, and technology is simple, and is with low cost, can be used for making wear-resistant cast steel partses such as bucket tooth, tup, tooth plate, liner plate, grip-pad.
Embodiment
The preparation method of the low-alloy manganese martensite wear resistant cast steel that the present invention proposes comprises following each step:
(1) with after the conventional process for making smelting, with sand mold casting or precision casting process casting, the weight percent of each composition is in the steel:
C：0.28～0.48wt.％；
Si：0.20～1.50wt.％；
Mn：1.85～3.50wt.％；
Cr：0.30～0.90wt.％；
Cu：0～0.90wt.％；
P：0.01～0.03wt.％；
S：0.01～0.03wt.％；
B：0～0.008wt.％；
Rare-Earth Ce: 0.05～0.25wt.%;
All the other are Fe;
(2) above-mentioned cast steel is heated to 830～900 ℃ of austenitizings, is incubated after 2-5 hour stove and is as cold as room temperature and carries out anneal;
(3) above-mentioned cast steel is heated to 830～900 ℃ of austenitizings, is incubated after 1-2 hour shrend to 80～150 ℃;
(4) above-mentioned cast steel being carried out low-temperaturetempering in 2～5 hours 200～250 ℃ of insulations handles.
Below introduce embodiments of the invention:
The preparation method of above-mentioned each embodiment is following:
Embodiment 1
(1) with after the conventional process for making smelting,, pours into a mould the Kiel sample simultaneously with sand mold casting or precision casting process casting.
(2) above-mentioned cast steel is heated to 880 ℃ of austenitizings, is incubated after 3 hours stove and is as cold as room temperature and carries out anneal.
(3) above-mentioned cast steel is heated to 860 ℃ of austenitizings, is incubated and is quenched into 120 ℃ after 1 hour.
(4) above-mentioned cast steel is heated to 220 ℃, is incubated 3 hours and carries out temper.
Embodiment 2
(1) with after the conventional process for making smelting,, pours into a mould the Kiel sample simultaneously with sand mold casting or precision casting process casting.
(2) above-mentioned cast steel is heated to 880 ℃ of austenitizings, is incubated after 3 hours stove and is as cold as room temperature and carries out anneal.
(3) above-mentioned cast steel is heated to 860 ℃ of austenitizings, is incubated and is quenched into 110 ℃ after 1 hour.
(4) above-mentioned cast steel is heated to 230 ℃, is incubated 3 hours and carries out temper.
Embodiment 3
(1) with after the conventional process for making smelting,, pours into a mould the Kiel sample simultaneously with sand mold casting or precision casting process casting.
(2) above-mentioned cast steel is heated to 880 ℃ of austenitizings, is incubated after 3 hours stove and is as cold as room temperature and carries out anneal.
(3) above-mentioned cast steel is heated to 850 ℃ of austenitizings, is incubated and is quenched into 110 ℃ after 1 hour.
(4) above-mentioned cast steel is heated to 220 ℃, is incubated 3 hours and carries out temper.
Embodiment 4
(1) with after the conventional process for making smelting,, pours into a mould the Kiel sample simultaneously with sand mold casting or precision casting process casting.
(2) above-mentioned cast steel is heated to 880 ℃ of austenitizings, is incubated after 3 hours stove and is as cold as room temperature and carries out anneal.
(3) above-mentioned cast steel is heated to 850 ℃ of austenitizings, is incubated and is quenched into 120 ℃ after 1 hour.
(4) above-mentioned cast steel is heated to 220 ℃, is incubated 3 hours and carries out temper.
Embodiment 5
(1) with after the conventional process for making smelting,, pours into a mould the Kiel sample simultaneously with sand mold casting or precision casting process casting.
(2) above-mentioned cast steel is heated to 880 ℃ of austenitizings, is incubated after 3 hours stove and is as cold as room temperature and carries out anneal.
(3) above-mentioned cast steel is heated to 850 ℃ of austenitizings, is incubated and is quenched into 110 ℃ after 1 hour.
(4) above-mentioned cast steel is heated to 220 ℃, is incubated 3 hours and carries out temper.
Embodiment 6
(1) with after the conventional process for making smelting,, pours into a mould the Kiel sample simultaneously with sand mold casting or precision casting process casting.
(2) above-mentioned cast steel is heated to 880 ℃ of austenitizings, is incubated after 3 hours stove and is as cold as room temperature and carries out anneal.
(3) above-mentioned cast steel is heated to 850 ℃ of austenitizings, is incubated and is quenched into 90 ℃ after 1 hour.
(4) above-mentioned cast steel is heated to 220 ℃, is incubated 3 hours and carries out temper.
Embodiment 7
(1) with after the conventional process for making smelting,, pours into a mould the Kiel sample simultaneously with sand mold casting or precision casting process casting.
(2) above-mentioned cast steel is heated to 880 ℃ of austenitizings, is incubated after 3 hours stove and is as cold as room temperature and carries out anneal.
(3) above-mentioned cast steel is heated to 850 ℃ of austenitizings, is incubated and is quenched into 90 ℃ after 1 hour.
(4) above-mentioned cast steel is heated to 230 ℃, is incubated 3 hours and carries out temper.
Embodiment 8
(1) with after the conventional process for making smelting,, pours into a mould the Kiel sample simultaneously with sand mold casting or precision casting process casting.
(2) above-mentioned cast steel is heated to 880 ℃ of austenitizings, is incubated after 3 hours stove and is as cold as room temperature and carries out anneal.
(3) above-mentioned cast steel is heated to 850 ℃ of austenitizings, is incubated and is quenched into 100 ℃ after 1 hour.
(4) above-mentioned cast steel is heated to 230 ℃, is incubated 3 hours and carries out temper.
Claims (1)
1. the preparation method of a low-alloy manganese martensite wear resistant cast steel is characterized in that this method comprises following each step:
(1) with after the conventional process for making smelting, with sand mold casting or precision casting process casting, obtain cast steel, the weight percent of each composition is in the cast steel:
C： 0.28～0.48wt.％；
Si： 0.20～1.50wt.％；
Mn： 1.85～3.50wt.％；
Cr： 0.30～0.90wt.％；
Cu： 0～0.90wt.％；
P： 0.01～0.03wt.％；
S： 0.01～0.03wt.％；
B： 0～0.008wt.％；
Rare-Earth Ce: 0.05～0.25wt.%;
All the other are Fe;
(2) cast steel with above-mentioned steps (1) is heated to 830～900 ℃ of austenitizings, is incubated after 2-5 hour stove and is as cold as room temperature and carries out anneal;
(3) cast steel with above-mentioned steps (2) is heated to 830～900 ℃ of austenitizings, is incubated after 1-2 hour shrend to 80～150 ℃;
(4) cast steel with above-mentioned steps (3) carried out the low-temperaturetempering processing in 2～5 hours 200～250 ℃ of insulations.
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| CN102758139A (en) * | 2011-04-29 | 2012-10-31 | 范黔伟 | ZG10Cr1Mn1Si1A batten martensite wear-resistant low-alloy steel and manufacturing method thereof |
| CN102303212B (en) * | 2011-06-24 | 2013-04-10 | 成都申信达机械有限公司 | Process for manufacturing lining board of wet-spraying machine |
| CN102660712B (en) * | 2012-06-08 | 2014-07-30 | 中兴能源装备股份有限公司 | Improved 30CrMnSi steel |
| CN102877073B (en) * | 2012-10-17 | 2014-11-19 | 常熟天地煤机装备有限公司 | Technology for processing CrNiMo series steel material |
| CN102876981A (en) * | 2012-10-17 | 2013-01-16 | 夏雨 | Method for preparing medium and low carbon chrome-silicon-manganese martensite cast steel with hardening surface layer |
| CN103627960A (en) * | 2013-12-10 | 2014-03-12 | 南昌航空大学 | Wear-resistant cast steel |
| CN110076296B (en) * | 2019-04-24 | 2020-12-08 | 焦作市威尔瑞福工业技术有限公司 | Novel composite toothed plate casting method of high-power high-throughput crusher |
| CN113462856B (en) * | 2021-07-02 | 2022-06-21 | 太原理工大学 | Heat treatment method for improving toughness of steel casting of middle trough ledge of scraper conveyor |
| CN115652185A (en) * | 2022-11-07 | 2023-01-31 | 中煤张家口煤矿机械有限责任公司 | Preparation method of high-strength low-alloy wear-resistant cast steel |
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| CN1019030B (en) * | 1989-12-30 | 1992-11-11 | 清华大学 | Bainite/martensite multi-phase steel with air-cooled high hardenability |
| KR100375086B1 (en) * | 1997-07-28 | 2003-03-28 | 닛폰 스틸 가부시키가이샤 | Ultra-high strength, weldable steel plate with excellent ultra-low temperature toughness and the method for preparing the same |
| CN101654728A (en) * | 2009-09-25 | 2010-02-24 | 清华大学 | Method for preparing manganese chilled bainitic steel |
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