CN102943212A - NM500 high-strength wear-resistant steel plate and heat treatment technique thereof - Google Patents
NM500 high-strength wear-resistant steel plate and heat treatment technique thereof Download PDFInfo
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Abstract
The invention relates to the field of manufacturing of high-strength wear-resistant steel plates, and discloses an NM500 high-strength wear-resistant steel plate and a heat treatment technique thereof. The NM500 high-strength wear-resistant steel plate comprises the following chemical components in percentage by mass: 0.25-0.28% of C, 0.80-1.20% of Mn, 0.20-0.40% of Si, at most 0.010% of S, at most 0.020% of P, 0.45-0.70% of Cr, 0.10-0.30% of Mo, 0.010-0.030% of Ti, 0.0010-0.0030% of B, 0.015-0.045% of Als, 0.015-0.050% of Nb, and the balance of Fe and inevitable impurities. The heat treatment technique is implemented in a way that: the quenching holding temperature is 830-880 DEG C, and the holding time is 1.2H-2.0Hmin (H is plate thickness and the unit is mm). By using the low-cost component design and sub-temperature heat treatment technique, the invention effectively saves the energy, and lowers the production cost; and the produced NM500 high-strength wear-resistant steel plate has the advantages of high strength, favorable wear resistance, favorable impact toughness and good welding performance.
Description
Technical field
The present invention relates to a kind of engineering machinery high-strength abrasion-proof steel plate and manufacturing process, specifically a kind of NM500 high-strength abrasion-proof steel plate and thermal treatment process thereof.
Background technology
Wear-resisting steel plate is widely used in the every field such as metallurgy, mine, building materials, electric power, railway and military affairs, and Focusing on components comprises excavator bucket teeth, ball grinding machine lining board, crusher jaw, crushing wall, rolled mortar wall, tractor shoe and railway switch etc.Wear resisting steel not only will have higher-strength and hardness, but also certain toughness and good weldability will be arranged, and therefore, usually adopts the Quenching plus tempering process manufacturing.At present, domestic is NM360-NM450 by the main production kind of GB/T 24186-2009 " engineering machinery high-strength abrasion-proof steel plate ", and usually producing the thickness specification is 8-60mm.And the wear-resisting steel plate of higher category need to add more noble metal, alloying element guaranteed cost, and production cost is high, and product is nocompetitive, the most of dependence on import of the demand of domestic market.
Before the present invention, " a kind of high strength low-cost dilute alloy wear resistant cast steel " patent (application number: 201110425482.1) of Zhangjagang City your kind effort cast steel company limited application, the composition range of this steel is: C 0.20-0.60%, Mn 0.50-1.50%, Si 0.50-1.50%, Cr 0.50-1.50%, RE＜0.20%, Ti＜0.20%, B＜0.015%, Al＜0.150%, all the other are Fe and inevitable impurity for Ca＜0.150%..This steel adopts cast steel again through conventional thermal treatment process, and this steel grade contains valuable rare earth metal RE and the higher noble metal elements such as Cr, B, and the casting production cost is higher than continuous casting.
" a kind of low-alloy super-strength wear resisting steel and the production method thereof " patent (application number: 201210091711.5) that also has KM Group Co., Ltd.'s application, its composition range is: C 0.20-0.35%, Mn 0.60-1.00%, Si 0.30-0.70%, Cr 0.70-1.10%, Ni 0.60-1.00%, Mo 0.30-0.70%, La 0.0005-0.010%, all the other are Fe and inevitable impurity.This steel adopts cast steel+forgings+conventional thermal treatment process, and this steel grade has also added valuable rare-earth metal La and the precious alloy elements such as higher Mo, Ni, Cr, cost height not only, and also the recovery rate of cast steel is low.
In addition, (patent No.: ZL200810200029.9), its chemical ingredients is " high strength martensitic wear resisting steel and production technique thereof " patent of Baoshan Iron ﹠ Steel Co., Ltd's application: C 0.10-0.20%, Mn 1.0-2.0%, Si 0.50-1.00%, S≤0.004%, P≤0.009%, Nb 0.020-0.040%, Ti 0.020-0.030%, V 0.015-0.060%, B 0.0015-0.0020%, Al＜0.030%, all the other are Fe and inevitable impurity.This steel adopts continuously cast bloom or the quick process for cooling of ingot casting+TMCP+, more Nb, V, the Ti alloy element of main adding in the composition, and tensile strength is greater than 1500MPa, and-20 ℃ of horizontal V-shape ballistic works are greater than 32J.Although this steel cost is low, adopt the quick process for cooling manufacturing of TMCP+, thermoforming or weld intensity decrease unavoidably appear, and quality is unstable.And since this steel to contain Si higher, though can improve the intensity of steel, also significantly reduce toughness and the weldability of steel, therefore be subject in use many limitations.
Summary of the invention
The purpose of this invention is to provide a kind of NM500 high-strength abrasion-proof steel plate and thermal treatment process thereof, this steel plate low cost of manufacture, Hardness Distribution is even, and steady quality has good obdurability, and welding property preferably.
A kind of NM500 high-strength abrasion-proof steel plate of the present invention, its chemical ingredients mass percent is: C 0.25 ~ 0.28%, and Mn 0.80 ~ 1.20%, Si 0.20 ~ 0.40%, S≤0.010%, P≤0.020%, Cr 0.45 ~ 0.70%, Mo 0.10 ~ 0.30%, Ti 0.010 ~ 0.030%, and B 0.0010 ~ 0.0030%, and Als 0.015 ~ 0.045%, Nb 0.015 ~ 0.050%, and all the other are Fe and inevitable impurity.
A kind of NM500 high-strength abrasion-proof steel plate of the present invention, its performance is: Brinell hardness number 〉=470HBW, tensile strength 〉=1500MPa, elongation after fracture 〉=7.0% ,-20 ℃ of vertical V-type ballistic work 〉=30J.
Main chemical compositions content of the present invention is based on following principle design:
(1) C 0.25 ~ 0.28%: carbon is one of most important solution strengthening element in the steel, can significantly improve intensity and the hardness of steel, but can affect larger on plasticity, toughness, weldability.The C constituent content is controlled in 0.25 ~ 0.28% the scope, thereby reduces the quenching crack susceptibility of this low-alloy super-strength wear resisting steel;
(2) Si 0.20 ~ 0.40%: silicon is beneficial element in the steel, and very strong solution strengthening effect is arranged, and significantly improves intensity and the hardness of steel, but the unfavorable tendency that increases grain coarsening and temper brittleness is arranged.When surpassing 0.50%, can cause the toughness of steel to descend, reduce the welding property of steel;
(3)Mn 0.80 ~ 1.20%: manganese also can reduce critical cooling velocity, stable austenite, postpone austenite to perlitic transformation, greatly improve hardening capacity, in the low levels scope, steel is had very large strengthening effect, can improve intensity, hardness and the wear resistance of steel, have simultaneously solid solution strengthening effect.If content is too high, not only cause easily the steel plate component segregation, also can make M
S(Ms (martensite start) point) point descends too many, and residual austenite increases when causing room temperature, is unfavorable for intensity, hardness and the wear resistance of steel, so the content of manganese is controlled in 0.80 ~ 1.20% the scope;
(4)S≤0.010%, P≤0.020%: higher phosphorus content can increase substantially the weathering resistance of steel, but phosphorus in steel, have cause easily segregation, worsen welding property, significantly reduce steel low-temperature impact toughness, improve brittle transition temperature, so, consider that wear resisting steel intensity of the present invention is higher, control phosphorus content≤0.020%.The easy generation MnS of being combined with manganese of sulphur is mingled with, and sulphur also affects the low-temperature impact toughness of steel.Therefore, should reduce as far as possible phosphorus, element sulphur to rigidity can disadvantageous effect;
(5)The Main Function of Cr 0.45 ~ 0.70%:Cr is to improve the hardening capacity of steel when quenching.It also can hinder growing up of austenite crystal when heating, increase the stability of supercooled austenite when cooling, reduces the quenching critical cooling velocity, improves the hardening capacity of steel.The increase of chromium can significantly improve intensity, hardness and the wear resistance of steel, but the weldability variation, and the toughness variation considers Cr content and is controlled in 0.45 ~ 0.70% the scope;
(6)Mo 0.10 ~ 0.30%: be present in the sosoloid and carbide of steel, solution strengthening effect is arranged, and can improve the hardening capacity of steel.Molybdenum belongs to the element that dwindles the austenite phase region, and molybdenum is present in steel in solid solution phase and the Carbide Phases.In Carbide Phases, when molybdenum content is low, form compound cementite with iron and carbon; When content is higher, then form its alloy carbide;
(7)Ti 0.010 ~ 0.030%, Nb 0.015 ~ 0.050%: titanium can form carbon, the oxynitride particle of tiny titanium, reheats in the process at slab and obtains comparatively tiny austenitic microstructure by the alligatoring that stops austenite crystal.Add a small amount of Nb and can improve the non-recrystallization temperature on the one hand, have enough motivating forces when making steel rolling in the high-temperature zone by the dynamic recrystallization crystal grain thinning; The simultaneously adding of Nb also has certain restraining effect to the control steel billet in the grain growth process that reheats the stage.The carbon of Ti and Nb, nitride all can be separated out in the whole operation of rolling, form the dispersion-strengthened of carbon (nitrogen) compound and to the pinning effect of crystal boundary, realize the refined crystalline strengthening effect;
(8)B 0.0010 ~ 0.0030%:B is the element that strongly improves hardening capacity, increases the tendency of cold crack.Obtaining in the situation of identical hardening capacity, adding B more is conducive to steel than other alloying elements of interpolation weldability.The steel that titanium-boron is processed, TiN or TiN+MnS+M
23(CB)
6Mixture all can be used as ferrite and gives birth to nuclear location and the refinement ferrite crystal grain;
(9)Als 0.015 ~ 0.045%: aluminium adds in the steel as reductor usually, and A1 also has certain strengthening effect, and aluminium nitride can improve the intensity of steel as other precipitates.Because the solid solubility of Al is very low, so its precipitating reinforcing effect is very limited, too much Al can make dissolving saturated, reduces the purity of steel.Usually the addition of sour molten aluminium Als is 0.015 ~ 0.045%, and the addition of full aluminium Alt is 0.020 ~ 0.050%.
The present invention also provides a kind of thermal treatment process of NM500 high-strength abrasion-proof steel plate, and its thermal treatment process is: the quenching and preserving heat temperature is at 830 ℃ ~ 880 ℃, and soaking time 1.2H ~ 2.0Hmin(H is thickness of slab, and unit is mm).
Advantage of the present invention is that chemical composition design that the NM500 steel plate adopts can be controlled carbon equivalent ce V and is lower than 0.60%, and weldability is better; Composition Design can guarantee to guarantee the hardening capacity of steel under the condition of low-alloy composition and low-carbon-equivalent, do not add valuable rare earth metal and precious alloy element Ni, V, and other precious alloy constituent content is few, and cost is low; The steel plate quenching holding temperature is chosen in 830 ℃ of-880 ℃ of insulations among the two-phase region Ac1～Ac3 of steel, belong to intercritical hardening, lower than conventional quenching heating and holding temperature (more than the Ac3), austenite has little time to grow up, make crystal grain obtain refinement, even, and at room temperature obtain behind the steel plate quenching take martensite as matrix, keep a small amount of disperse ferritic duplex structure that distributes, also corresponding refinement of the martensitic stucture after phase transformation, evenly; Adopt intercritical hardening to heat-treat with respect to the contribution of conventional thermal treatment (quenching+low-temperaturetempering) to toughness and can improve more than 50%.Therefore, steel plate has higher intensity, good wear resistance, impelling strength and welding property preferably.And the present invention is Composition Design and Ya Wenre treatment process cheaply, does not need low-temperaturetempering, effectively save energy, reduce production costs, further enhance productivity, improve output.
The implementation way
Purpose illustrates technical scheme of the present invention with following specific examples for a better understanding of the present invention.
Embodiment 1:A kind of NM500 high-strength abrasion-proof steel plate, thickness 30mm, its chemical ingredients forms: mass percent C 0.28%, Mn 0.90%, and Si 0.28%, and S 0.010%, P 0.018%, Cr 0.50%, and Mo 0.21%, and Ti 0.014%, B 0.0015%, Als 0.029%, and Nb 0.050%, and all the other are Fe and inevitable impurity.Following table 1 be under this composition by controlled rolling air cooling and Ya Wenre treatment process parameter, table 2 is the mechanical properties that obtain under this composition and the Ya Wenre treatment process parameter.
Table 1 heating, rolling and Ya Wenre treatment process.
Table 2 mechanical property.
Embodiment 2:A kind of NM500 high-strength abrasion-proof steel plate, thickness 50mm, its chemical ingredients forms: mass percent C 0.26%, Mn 0.90%, and Si 0.40%, and S 0.008%, P 0.020%, Cr 0.70%, and Mo 0.12%, and Ti 0.010%, B 0.0030%, Als 0.015%, and Nb 0.015%, and all the other are Fe and inevitable impurity.Following table 3 be under this composition by controlled rolling air cooling and Ya Wenre treatment process parameter, table 4 is that this composition and Ya Wenre process the mechanical property that obtains under worker's processing parameter.
Table 3 heating, rolling and Ya Wenre treatment process.
Table 4 mechanical property.
Embodiment 3:A kind of NM500 high-strength abrasion-proof steel plate, thickness 12mm, its chemical ingredients forms: mass percent C 0.25%, Mn 0.82%, and Si 0.20%, and S 0.006%, P 0.016%, Cr 0.51%, and Mo 0.20%, and Ti 0.030%, B 0.0010%, Als 0.045%, and Nb 0.019%, and all the other are Fe and inevitable impurity.Following table 5 be under this composition by controlled rolling air cooling and Ya Wenre treatment process parameter, table 6 is the mechanical properties that obtain under this composition and the Ya Wenre treatment process parameter.
Table 5 heating, rolling and Ya Wenre treatment process.
Table 6 mechanical property.
Embodiment 4:A kind of NM500 high-strength abrasion-proof steel plate, thickness 20mm, its chemical ingredients forms: mass percent C 0.26%, and Mn 1.20%, and Si 0.27%, S 0.002%, and P 0.009%, and Cr 0.45%, and Mo 0.10%, Ti 0.015%, and B 0.0015%, and Als 0.031%, and Nb 0.018%.All the other are Fe and inevitable impurity.Following table 7 be under this composition by controlled rolling air cooling and Ya Wenre treatment process parameter, table 8 is the mechanical properties that obtain under this composition and the Ya Wenre treatment process parameter.
Table 7 heating, rolling and Ya Wenre treatment process.
Table 8 mechanical property.
Embodiment 5:A kind of NM500 high-strength abrasion-proof steel plate, thickness 40mm, its chemical ingredients forms: mass percent C 0.26%, Mn 0.80%, and Si 0.30%, and S 0.0010%, P 0.016%, Cr 0.58%, and Mo 0.30%, and Ti 0.016%, B 0.0022%, Als 0.029%, and Nb 0.016%, and all the other are Fe and inevitable impurity.Following table 9 be under this composition by controlled rolling air cooling and Ya Wenre treatment process parameter, table 10 is the mechanical properties that obtain under this composition and the Ya Wenre treatment process parameter.
Table 9 heating, rolling and Ya Wenre treatment process.
Table 10 mechanical property.
Can find out by embodiment 1-5, the heat treatment process parameter that sets by Composition Design of the present invention and sub-temperature quenching process, the NM500 high-strength abrasion-proof steel plate of producing, has low-cost advantage, performance index: Brinell hardness number 〉=485HBW, tensile strength 〉=1584MPa, elongation after fracture 〉=7.0% ,-20 ℃ of vertical V-type ballistic work 〉=32J.Steel plate has higher intensity, good wear resistance, impelling strength and welding property preferably.Overall target surpasses the requirement of the GB/T 24186-2009 standard NM500 trade mark, satisfies better user's use expectation.
Claims (3)
1. a NM500 high-strength abrasion-proof steel plate is characterized in that, its chemical ingredients mass percent is: C 0.25 ~ 0.28%, Mn 0.80 ~ 1.20%, and Si 0.20 ~ 0.40%, S≤0.010%, P≤0.020%, Cr 0.45 ~ 0.70%, and Mo 0.10 ~ 0.30%, and Ti 0.010 ~ 0.030%, B 0.0010 ~ 0.0030%, Als 0.015 ~ 0.045%, and Nb 0.015 ~ 0.050%, and all the other are Fe and inevitable impurity.
2. a kind of NM500 high-strength abrasion-proof steel plate according to claim 1, it is characterized in that described NM500 high-strength abrasion-proof steel plate performance is: Brinell hardness number 〉=470HBW, tensile strength 〉=1500MPa, elongation after fracture 〉=7.0% ,-20 ℃ of vertical V-type ballistic work 〉=30J.
3. the thermal treatment process of a NM500 high-strength abrasion-proof steel plate is characterized in that, its thermal treatment process is: the quenching and preserving heat temperature is at 830 ℃-880 ℃, and soaking time 1.2H ~ 2.0Hmin(H is thickness of slab, and unit is mm).
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| CN103667955A (en) * | 2013-12-20 | 2014-03-26 | 齐齐哈尔轨道交通装备有限责任公司 | Steel with high impact strength and casting prepared therefrom |
| CN104357747A (en) * | 2014-10-27 | 2015-02-18 | 中国科学院金属研究所 | Microalloyed manganese boron alloy steel as well as thermal treatment method and application thereof |
| CN104451409A (en) * | 2014-12-05 | 2015-03-25 | 武汉钢铁(集团)公司 | Low-cost HB400-grade wear-resisting steel and production method thereof |
| CN105002441A (en) * | 2015-08-11 | 2015-10-28 | 内蒙古包钢钢联股份有限公司 | Steel for high-hardenability wear-resistant bucket teeth |
| CN105671429A (en) * | 2016-03-30 | 2016-06-15 | 内蒙古第一机械集团有限公司 | High-performance E+ steel containing rare earth |
| CN106756489A (en) * | 2016-12-14 | 2017-05-31 | 武汉钢铁股份有限公司 | 450 grades of anti-crack high-strength abrasion-proof steels of Brinell hardness and its manufacture method |
| CN106893942A (en) * | 2017-04-02 | 2017-06-27 | 首钢总公司 | A kind of high intensity bainite antiwear steel plate and its production method |
| CN107523668A (en) * | 2017-09-01 | 2017-12-29 | 华菱安赛乐米塔尔汽车板有限公司 | One kind is without coating intensity adjustable steel composite material |
| CN107604142A (en) * | 2017-09-01 | 2018-01-19 | 华菱安赛乐米塔尔汽车板有限公司 | A kind of intensity adjustable steel composite material |
| CN109182666A (en) * | 2018-11-12 | 2019-01-11 | 南京钢铁股份有限公司 | A kind of width thin gauge NM450 abrasion-resistant stee steel plate and manufacturing method |
| CN110042306A (en) * | 2019-04-22 | 2019-07-23 | 桂林理工大学 | A kind of the NM600 wear-resisting steel plate and its production method of suitable worst hot case |
| CN110039267A (en) * | 2019-05-28 | 2019-07-23 | 聊城市东昌府区嘉泰轴承保持器厂 | A kind of wind-powered turntable bearing wear-resistant material ball retainer Integral welded technique |
| CN110527920A (en) * | 2019-10-16 | 2019-12-03 | 武汉钢铁集团鄂城钢铁有限责任公司 | The special thick wear-resisting steel plate of 60~80mm of one kind and its production method |
| CN110592497A (en) * | 2019-09-18 | 2019-12-20 | 宁波市鄞州富春精密铸造有限公司 | High-strength cast steel and preparation method thereof |
| CN114774778A (en) * | 2022-03-29 | 2022-07-22 | 河北普阳钢铁有限公司 | Low-carbon equivalent NM500 and production method thereof |
| CN116024492A (en) * | 2022-12-15 | 2023-04-28 | 柳州市久日工程机械有限公司 | Preparation method of wear-resistant steel plate |
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| CN104357747A (en) * | 2014-10-27 | 2015-02-18 | 中国科学院金属研究所 | Microalloyed manganese boron alloy steel as well as thermal treatment method and application thereof |
| CN104451409A (en) * | 2014-12-05 | 2015-03-25 | 武汉钢铁(集团)公司 | Low-cost HB400-grade wear-resisting steel and production method thereof |
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| CN109182666A (en) * | 2018-11-12 | 2019-01-11 | 南京钢铁股份有限公司 | A kind of width thin gauge NM450 abrasion-resistant stee steel plate and manufacturing method |
| CN110042306A (en) * | 2019-04-22 | 2019-07-23 | 桂林理工大学 | A kind of the NM600 wear-resisting steel plate and its production method of suitable worst hot case |
| CN110039267A (en) * | 2019-05-28 | 2019-07-23 | 聊城市东昌府区嘉泰轴承保持器厂 | A kind of wind-powered turntable bearing wear-resistant material ball retainer Integral welded technique |
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| CN114774778A (en) * | 2022-03-29 | 2022-07-22 | 河北普阳钢铁有限公司 | Low-carbon equivalent NM500 and production method thereof |
| CN116024492A (en) * | 2022-12-15 | 2023-04-28 | 柳州市久日工程机械有限公司 | Preparation method of wear-resistant steel plate |
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