CN102943212B - 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 will have certain toughness and good weldability, therefore, conventionally adopts Quenching plus tempering process manufacture.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 conventionally producing thickness specification is 8-60mm.And the wear-resisting steel plate of higher category need to add more noble metal, alloying element guaranteed cost, production cost is high, and product is nocompetitive, the most of dependence on import of 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 your kind effort cast steel company limited of Zhangjagang City 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 such as Cr, B element, and casting production cost is higher than continuous casting.
Also has " a kind of low-alloy super-strength wear resisting steel and production method thereof " patent (application number: 201210091711.5) of 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+forging+conventional thermal treatment process, and this steel grade has also added valuable rare-earth metal La and the higher precious alloy element such as Mo, Ni, Cr, and not only cost is high, and the recovery rate of cast steel is low.
In addition, " high strength martensitic wear resisting steel and production technique thereof " patent (patent No.: ZL200810200029.9) of Baoshan Iron & Steel Co., Ltd's application, its chemical composition is: 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+, mainly adds more Nb, V, Ti alloy element in composition, and tensile strength is greater than 1500MPa, and-20 DEG C of horizontal V-shape ballistic works are greater than 32J.Although this steel cost is low, adopt the quick process for cooling manufacture of TMCP+, unavoidably occur that thermoforming or weld intensity significantly reduce, quality is unstable.And because this steel is higher containing Si, though can improve the intensity of steel, also significantly reduce toughness and the weldability of steel, be therefore subject in use many limitations.
Summary of the invention
The object 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 good welding property.
A kind of NM500 high-strength abrasion-proof steel plate of the present invention, its chemical composition mass percent is: C 0.25 ~ 0.28%, 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%, B 0.0010 ~ 0.0030%, Als 0.015 ~ 0.045%, Nb 0.015 ~ 0.050%, 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 DEG C of longitudinal 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 steel, can significantly improve intensity and the hardness of steel, but can affect larger on plasticity, toughness, weldability.C constituent content is controlled in 0.25 ~ 0.28% 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 steel, has very strong solution strengthening effect, significantly improves intensity and the hardness of steel, but has the unfavorable tendency that increases grain coarsening and temper brittleness.While exceeding 0.50%, can cause the toughness of steel to decline, 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, within the scope of low levels, steel is had to very large strengthening effect, can improve intensity, hardness and the wear resistance of steel, there is solid solution strengthening effect simultaneously.If content is too high, not only easily cause steel plate component segregation, also can make M
s(Ms (martensite start) point) point declines too many, and while causing room temperature, residual austenite increases, and is unfavorable for intensity, hardness and the wear resistance of steel, and therefore the content of manganese is controlled in 0.80 ~ 1.20% scope;
(4)s≤0.010%, P≤0.020%: higher phosphorus content can increase substantially the weathering resistance of steel, but phosphorus in steel, have easily cause 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 phosphorus, the disadvantageous effect of element sulphur to rigidity energy as far as possible;
(5)the Main Function of Cr 0.45 ~ 0.70%:Cr is to improve the hardening capacity of steel in the time quenching.It also can hinder growing up of austenite crystal in the time of heating, increases the stability of supercooled austenite when cooling, reduces 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 weldability variation, and toughness variation considers Cr content and is controlled in 0.45 ~ 0.70% scope;
(6)mo 0.10 ~ 0.30%: be present in the sosoloid and carbide of steel, have solution strengthening effect, and can improve the hardening capacity of steel.Molybdenum belongs to the element that dwindles austenite phase region, and molybdenum is present in solid solution phase and Carbide Phases in steel.In Carbide Phases, in the time that molybdenum content is lower, form compound cementite with iron and carbon; In the time that content is higher, 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, reheat in process and obtain comparatively tiny austenitic microstructure by the alligatoring that stops austenite crystal at slab.Add a small amount of Nb can improve non-recrystallization temperature on the one hand, make steel in the time of the rolling of high-temperature zone, there is enough motivating forces by dynamic recrystallization crystal grain thinning; Also there is certain restraining effect to controlling steel billet in the grain growth process that reheats the stage adding of Nb simultaneously.Carbon, the nitride of Ti and Nb all can be separated out in the whole operation of rolling, form the dispersion-strengthened of carbon (nitrogen) compound and the pinning effect to crystal boundary, realize 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.In the situation that obtaining identical hardening capacity, add B is more conducive to steel weldability than other alloying elements of interpolation.The steel of titanium-boron processing, TiN or TiN+MnS+M
23(CB)
6mixture all can be used as the raw nuclear location of ferrite and refinement ferrite crystal grain;
(9)als 0.015 ~ 0.045%: aluminium adds in steel usually used as reductor, 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 to dissolve saturated, reduces the purity of steel.The addition of common acid-soluble 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: quenching and preserving heat temperature is at 830 DEG C ~ 880 DEG C, and soaking time 1.2H ~ 2.0Hmin(H is thickness of slab, and unit is mm).
Advantage of the present invention is that the chemical composition design that NM500 steel plate adopts can be controlled carbon equivalent ce V lower than 0.60%, and weldability is better; Composition Design can ensure 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; Steel plate quenching holding temperature is chosen in 830 DEG C of-880 DEG C of insulations in the two-phase region Ac1～Ac3 of steel, belong to intercritical hardening, lower than conventional quenching heating and holding temperature (more than Ac3), austenite has little time to grow up, make crystal grain obtain refinement, even, and after steel plate quenching, at room temperature obtain taking martensite as matrix, retain a small amount of disperse ferritic duplex structure that distributes, also corresponding refinement of the martensitic stucture after phase transformation, evenly; Adopting intercritical hardening to heat-treat with respect to conventional thermal treatment (quenching+low-temperaturetempering) can improve more than 50% the contribution of toughness.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.
concrete implementing method
Object for a better understanding of the present invention, illustrates technical scheme of the present invention with following specific examples.
embodiment 1:a kind of NM500 high-strength abrasion-proof steel plate, thickness 30mm, its chemical composition composition: mass percent C 0.28%, Mn 0.90%, Si 0.28%, S 0.010%, P 0.018%, Cr 0.50%, Mo 0.21%, Ti 0.014%, B 0.0015%, Als 0.029%, Nb 0.050%, all the other are Fe and inevitable impurity.Following table 1 be under this composition by controlled rolling air cooling and sub-temperature heat treatment process parameter, table 2 is the mechanical properties that obtain under this composition and sub-temperature heat 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 composition composition: mass percent C 0.26%, Mn 0.90%, Si 0.40%, S 0.008%, P 0.020%, Cr 0.70%, Mo 0.12%, Ti 0.010%, B 0.0030%, Als 0.015%, Nb 0.015%, all the other are Fe and inevitable impurity.Following table 3 be under this composition by controlled rolling air cooling and sub-temperature heat treatment process parameter, table 4 is that this composition and Ya Wenre process the mechanical property obtaining under work 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 composition composition: mass percent C 0.25%, Mn 0.82%, Si 0.20%, S 0.006%, P 0.016%, Cr 0.51%, Mo 0.20%, Ti 0.030%, B 0.0010%, Als 0.045%, Nb 0.019%, all the other are Fe and inevitable impurity.Following table 5 be under this composition by controlled rolling air cooling and sub-temperature heat treatment process parameter, table 6 is the mechanical properties that obtain under this composition and sub-temperature heat 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 composition composition: mass percent C 0.26%, Mn 1.20%, Si 0.27%, S 0.002%, P 0.009%, Cr 0.45%, Mo 0.10%, Ti 0.015%, B 0.0015%, Als 0.031%, Nb 0.018%.All the other are Fe and inevitable impurity.Following table 7 be under this composition by controlled rolling air cooling and sub-temperature heat treatment process parameter, table 8 is the mechanical properties that obtain under this composition and sub-temperature heat 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 composition composition: mass percent C 0.26%, Mn 0.80%, Si 0.30%, S 0.0010%, P 0.016%, Cr 0.58%, Mo 0.30%, Ti 0.016%, B 0.0022%, Als 0.029%, Nb 0.016%, all the other are Fe and inevitable impurity.Following table 9 be under this composition by controlled rolling air cooling and sub-temperature heat treatment process parameter, table 10 is the mechanical properties that obtain under this composition and sub-temperature heat 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 setting by Composition Design of the present invention and sub-temperature quenching process, the NM500 high-strength abrasion-proof steel plate of producing, there is low-cost advantage, performance index: Brinell hardness number >=485HBW, tensile strength >=1584MPa, elongation after fracture >=7.0% ,-20 DEG C of longitudinal V-type ballistic work >=32J.Steel plate has higher intensity, good wear resistance, impelling strength and welding property preferably.Overall target exceedes the requirement of the GB/T 24186-2009 standard NM500 trade mark, and the use that meets better user is expected.
Claims (3)
1. a NM500 high-strength abrasion-proof steel plate, it is characterized in that, adopt intercritical hardening, quenching and preserving heat temperature be 830 DEG C to being less than 860 DEG C, after quenching, do not carry out low-temperaturetempering processing, its chemical composition mass percent is: C0.25～0.28%, Mn0.80～1.20%, Si0.20～0.40%, S≤0.010%, P≤0.020%, 0.45%≤Cr < 0.70%, Mo0.10～0.30%, Ti0.010～0.030%, B0.0010～0.0030%, Als0.015～0.045%, Nb0.015～0.050%, 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 DEG C of longitudinal V-type ballistic work >=30J.
3. a thermal treatment process for NM500 high-strength abrasion-proof steel plate, is characterized in that, described steel plate chemical composition mass percent is: C0.25～0.28%, Mn0.80～1.20%, Si0.20～0.40%, S≤0.010%, P≤0.020%, 0.45%≤Cr < 0.70%, Mo0.10～0.30%, Ti0.010～0.030%, B0.0010～0.0030%, Als0.015～0.045%, Nb0.015～0.050%, all the other are Fe and inevitable impurity; Described plate property is: Brinell hardness number >=470HBW, tensile strength >=1500MPa, elongation after fracture >=7.0% ,-20 DEG C of longitudinal V-type ballistic work >=30J; Its thermal treatment process is: adopt intercritical hardening, after quenching, do not carry out low-temperaturetempering processing, quenching and preserving heat temperature be 830 DEG C to being less than 860 DEG C, soaking time 1.2H～2.0Hmin, H is thickness of slab, unit is mm.
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