CN101691640A - High strength low alloy wear resistance steel plate and preparation method thereof - Google Patents
High strength low alloy wear resistance steel plate and preparation method thereof Download PDFInfo
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Abstract
The invention relates to high strength low alloy wear resistance steel plate and a preparation method thereof. The steel comprises the following chemical compositions by weight percent: 0.18-0.22% of C, 0.2-0.5% of Si, 1.0-1.6% of Mn, 0.010% or less of P, 0.005% or less of S, 0.02-0.03% of Al, 0.016-0.022% of Ti, 0.16-0.20% of Cr, 0.0005-0.0015% of B and the balance Fe and inevitable impurities. The carbon equivalent (Ceq) is equal to 0.5% or less than 0.5%, while Ceq (%) = C + Mn/6 + Si/24 + Ni/40+ Cr/5 + Mo/4 + V/14. The preparation method of the steel plate comprises the process of preparing ultra-pure steel, and the preparation method is characterized in that the specific parameters are controlled as follows: the plate blank is heated to the temperature range of 1180-1200 DEG C, the heating time is not less than 150min; the screw-down rate for rolling each pass is 15-30%, the accumulated screw-down rate is not less than 70%, the starting temperature of hot rolling is 1050-1100 DEG C, the finishing temperature is above 950 DEG C; and the heat treatment is performed after the steel plate is rolled and the heat treatment comprises quenching and low temperature tempering steps, wherein the quenching conditions are that the steel plate is heated to the temperature range of 910-950 DEG C and the holding time is 3min/mm and the tempering conditions are that the steel plate is heated to 250 DEG C and the holding time is 2.5min/mm. The method of the invention can increase the wear resistance, welding performance, strength and hardness, simplify production process and reduce cost of steel plates.
Description
Technical field
The present invention relates to a kind of mechanical engineering wear-resisting steel plate, specifically relate to the low alloy wear resistance steel plate and the manufacturing process thereof of a kind of high strength, high rigidity and obdurability rational Match.
Background technology
The wear resisting steel of present domestic application mainly contain high mangaenese steel and in, low-alloy wear-resistant steel etc.The wear resistance of high mangaenese steel is with good conditionsi, is only impacting under the situation big, that stress is high, abrasive material is hard, and high mangaenese steel is just wear-resisting, and its yield strength is low, easily deformable.In, low-alloy wear-resistant steel has good obdurability, wear resistance and solidity to corrosion, and cost compares relatively lowly with other wear-resisting steel grades, be suitable for making all kinds of wearing pieces.
In the domestic production, the general alloy content of low-alloy wear-resistant steel is higher, alloy species is more, and be applied to mining machinery, the wear parts above the engineering machinery needs to weld more, the too high meeting of alloy content is to destroying the welding property of steel plate.Simultaneously exist the cost height, than slab through hardening poor performance, hardness and toughness do not reach requirement, problems such as wear resisting property difference yet.
For example, the low-alloy wear-resistant steel of domestic production adds higher Mo and Ni usually, Mo content is usually between 0.25 ~ 0.60%, Ni content is between 0.25 ~ 0.50%, these two kinds of elements are more valuable, cost is higher, should reduce the content of these two kinds of elements as far as possible or not add Mo, Ni element, can reduce cost greatly like this.Simultaneously some elements such as Cr, V also add morely in wear resisting steel in the past, and usually between 0.3 ~ 0.8%, this can increase the carbon equivalent of steel as Cr content, and the welding property of steel plate is produced a very large impact.
Summary of the invention
The purpose of this invention is to provide a kind of high strength low alloy wear resistance steel plate and manufacture method thereof, improve steel plate wear resisting property, welding property, intensity and hardness, and simplify production technique, reduction steel plate cost.
A kind of high strength low alloy wear resistance steel of the present invention, the chemical ingredients of steel is by weight percentage: C0.18 ~ 0.22%, Si 0.2 ~ 0.5%, and Mn 1.0 ~ 1.6%, P≤0.010%, S≤0.005%, Al 0.02 ~ 0.03%, and Ti 0.016 ~ 0.022%, and Cr 0.16 ~ 0.20%, B 0.0005 ~ 0.0015%, and all the other are Fe and unavoidable impurities.And carbon equivalent Ceq (%)≤0.5 also satisfies: Ceq (%)=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14 simultaneously.
The manufacture method of this high strength low alloy wear resistance steel plate may further comprise the steps: ultra-clean steel technology is smelted
Desulfurizing iron-vacuum-treat-pour into slab-slab heating-rolling-air cooling-steel plate thermal treatment is characterized in that concrete parameter is controlled to be:
Slab is heated to 1180～1200 ℃, heat-up time 〉=150min;
Rolling every time draft is 15～30%, accumulative total draft 〉=70%, and hot rolling begins 1050～1100 ℃ of temperature, and end temp is more than 950 ℃;
After rolling, steel plate heat-treats (quenching+low-temperaturetempering); The quenching system is: be heated to 910～950 ℃, soaking time 3min/mm; The tempering system is: be heated to 250 ℃, soaking time 2.5min/mm.
Main chemical compositions content of the present invention reaches and mainly act as:
Carbon of the present invention (C) content is 0.18 ~ 0.22%: carbon is the vital element that influences wear resisting steel intensity, hardness, toughness and hardening capacity, wear resistance.Carbon content is too high, the high carbon martensite hardness height that forms after the thermal treatment, but toughness is low, and easily form crackle during thermal treatment; Carbon content is low excessively, and hardness is low, and wear resistance is not good.
Silicon of the present invention (Si) content is 0.2 ~ 0.5%: silicon in steelmaking process as reductive agent and reductor, combine with chromium, the erosion resistance of raising and oxidation resistant effect are arranged, above 0.5% o'clock, can cause the toughness of steel to descend, the too high weldability that can worsen steel of silicone content.
Manganese of the present invention (Mn) content is 1.0 ~ 1.6%: manganese is with low cost, is good reductor and sweetening agent, significantly improves hardening capacity.Manganese is very big to the hardness and the impact toughness influence of steel, and hardness rises with the raising of manganese content, and impact toughness then descends thereupon.The manganese too high levels can reduce welding property.
Phosphorus of the present invention (P) content≤0.010%, sulphur (S) content≤0.005%: p and s all is harmful element in the steel under normal conditions, increases the fragility of steel.Phosphorus can destroy the welding property and the plasticity of steel; Sulphur easily combines generation with manganese and is mingled with, and can also reduce the toughness of steel.Therefore, should reduce phosphorus, the sulphur content in steel as far as possible.
Aluminium of the present invention (Al) content is that 0.02 ~ 0.03%:Al mainly act as deoxidation.But add a spot of aluminium crystal grain thinning in the steel, improve impelling strength.The aluminium too high levels can cause the oxide inclusion of Al to increase, and reduces the purity of steel.
Titanium of the present invention (Ti) content is 0.016 ~ 0.022%: titanium can form tiny carbon, nitride, stops austenite crystal to grow up crystal grain thinning.Also can improve simultaneously the welding property of steel.
Chromium of the present invention (Cr) content is 0.16 ~ 0.20%: it is the hardening capacity that improves steel that chromium mainly acts on, the matrix of solution strengthening simultaneously, and thinning microstructure significantly improves the antioxygenation of steel, increases its erosion-resisting ability.
Boron of the present invention (B) content is 0.0005 ~ 0.0015%: trace B can improve the compactness and the hot rolling performance of steel, improves steel plate hardening capacity, improves intensity.
The present invention has the following advantages
1. surface of steel plate Brinell hardness of the present invention is HB400 ~ HB440, and tensile strength is 1350MPa ~ 1450MPa, unit elongation＞11%; Steel plate impelling strength is good, and impelling strength is all more than 24J/cm2 when-20 ℃ and-40 ℃.Steel of the present invention has high surface hardness, therefore have good wearability can, have simultaneously high tensile strength and preferably unit elongation and suitable obdurability mate, excellent comprehensive performances is arranged.
2. the chemical composition design that steel plate of the present invention adopts, the alloying element kind is less, and it is less not contain noble metal element or content, and cost is low; Carbon equivalent is low, and good welding property is arranged; The reasonable component design makes steel plate have good hardening capacity.
3. the rolling employing austenite recrystallization of the present invention district is rolling, adopts big pass deformation to increase austenitic recrystallize quantity, and crystal grain thinning saves middle time of staying temperature, thereby shortens the rolling cycle, and rolling technology is simple, can reduce production costs.
Description of drawings
Fig. 1 is the complex tissue photo that obtains after the example 1 high-strength abrasion-proof steel plate thermal treatment;
Fig. 2 is the complex tissue photo that obtains after the example 2 high-strength abrasion-proof steel plate thermal treatments;
Embodiment
With following two specific embodiments technical scheme of the present invention is described:
Embodiment 1
The concrete chemical ingredients of 12mm thickness of slab high-strength abrasion-proof steel plate of example 1 sees Table 1:
Table 1 be embodiment 1 steel chemical ingredients (mass percent, %)
Carry out vacuum metling by above proportioning chemical ingredients, be cast into base.
Slab is heated to 1180 ~ 1200 ℃, heat-up time 〉=150min.
Every time draft of hot rolling is 15 ~ 30%, accumulative total draft 〉=70%, and hot rolling begins 1050 ~ 1100 ℃ of temperature, end temp 〉=950 ℃.
After rolling, steel plate heat-treats (quenching+low-temperaturetempering).
The quenching system is: be heated to 950 ℃, soaking time is 36min, water-cooled; The tempering system is: be heated to 250 ℃, soaking time 30min, air cooling.
Obtain the good small portion of residual austenite of martensite, toughness of high rigidity and the complex tissue of the fine carbide that disperse is separated out after the thermal treatment, see shown in Figure 1.
The concrete mechanical property detected result of embodiment 1 steel sees Table 2:
Table 2 is the mechanical property of embodiment 1 steel
Embodiment 2
The concrete chemical ingredients of 12mm thickness of slab high-strength abrasion-proof steel plate of example 2 sees Table 3:
Table 3 be embodiment 2 steel chemical ingredients (mass percent, %)
Carry out vacuum metling by above proportioning chemical ingredients, be cast into base.
Slab is heated to 1180～1200 ℃, heat-up time at least 〉=150min;
Every time draft of hot rolling is 15～30%, accumulative total draft 〉=70%, and hot rolling begins 1050～1100 ℃ of temperature, and heat-treat after steel plate rolls end temp 〉=950 ℃, the back low-temperaturetempering of quenching.
The quenching system is: be heated to 950 ℃, soaking time is 36min, water-cooled; The tempering system is: be heated to 250 ℃, soaking time 30min, air cooling.
Obtain the good small portion of residual austenite of martensite, toughness of high rigidity and the complex tissue of the fine carbide that disperse is separated out after the thermal treatment, see shown in Figure 2.
The concrete mechanical property detected result of embodiment 2 steel sees Table 4:
Table 4 is the mechanical property of embodiment 2 steel
Claims (6)
1. high strength low alloy wear resistance steel plate, the chemical ingredients that it is characterized in that steel is by mass percentage: C0.18～0.22%, Si 0.2～0.5%, and Mn 1.0～1.6%, P≤0.010%, S≤0.005%, Al 0.02～0.03%, Ti0.016～0.022%, and Cr 0.16～0.20%, B 0.0005～0.0015%, and all the other are Fe and unavoidable impurities.And carbon equivalent Ceq (%)≤0.5 also satisfies: Ceq (%)=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14 simultaneously.
2. another kind of high strength low alloy wear resistance steel plate as claimed in claim 1, the chemical ingredients that it is characterized in that steel can also be to be by mass percentage: C 0.16～0.20%, Si 0.2～0.4%, Mn 1.0～1.6%, P≤0.010%, S≤0.005%, Ni 0.18～0.22%, and Al 0.02～0.03%, and Ti 0.016～0.022%, Mo 0.18～0.22%, Cr 0.16～0.20%, and B 0.0008～0.0015%, and all the other are Fe and unavoidable impurities, and carbon equivalent Ceq (%)≤0.6 also satisfies: Ceq (%)=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14 simultaneously.
3. high strength low alloy wear resistance steel plate as claimed in claim 1 or 2 is characterized in that described steel plate Brinell hardness number is between HB400～HB440, and tensile strength is 1350MPa ~ 1450MPa, unit elongation＞11%; When steel plate impelling strength-20 ℃ and-40 ℃, more than the 24J/cm2.
4. the manufacture method of a high strength low alloy wear resistance steel plate as claimed in claim 3, may further comprise the steps: ultra-clean steel technology is smelted
-desulfurizing iron-vacuum-treat-pour into slab-slab heating-rolling-air cooling-steel plate thermal treatment is characterized in that following each step parameter is controlled to be:
1) carries out vacuum metling and be cast into base by the proportioning chemical ingredients;
2) slab is heated to 1180～1200 ℃, heat-up time 〉=150min;
3) be rolled at 950～1100 ℃, reduction in pass is 15～30%, and the accumulative total draft is not less than 70%;
4) carry out quench treatment, be heated to 910～950 ℃ the insulation 3min/mm after water-cooled;
5) carry out temper at 250 ℃, soaking time is 2.5min/mm, air cooling.
5. manufacture method according to claim 4 is characterized in that 3) hot rolling begins 1050～1100 ℃ of temperature, and end temp is more than 950 ℃.
6. manufacture method according to claim 4 is characterized in that 4) steel plate heat-treats after rolling and comprises and quenching and the low-temperaturetempering processing, and the quenching system is: be heated to 910～950 ℃, soaking time 3min/mm; The tempering system is: be heated to 250 ℃, soaking time 2.5min/mm.
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