CN104451437A - Method for preparing large high-performance cold roll - Google Patents
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Abstract
The invention discloses a method for preparing a large high-performance cold roll. According to the method, the alloy components of the cold roll are improved, the purpose of replacing certain alloy elements with high prices, like tungsten, molybdenum, vanadium, niobium and cobalt, by boron with the low price is achieved through the optimization of a series of technology steps such as mold casting, blank forming, forging forming, ultrasonic flaw detection, lathe rough operation, semifinishing, isothermal annealing after forging and subzero treatment, the roll cost is promoted to be obviously lowered, the hardness, the evenness and the strength value performance of the roll are greatly improved, the heat treatment condition in the roll preparation process is optimized according to the characteristics of alloy, and the preparation energy consumption is effectively lowered.
Description
Technical field
The invention belongs to steel rolling technical field of ferrous metallurgy, specifically a kind of preparation method of high-performance large-scale cold roll and the cold roll produced by the method.
Background technology
Cold roll is owing to bearing large load for a long time during rolling, and problems such as adding the weld seam of rolled piece, be mingled with, limit is split, easily cause instantaneous high-temperature, working roll is subject to, and strong thermal shocking causes crackle, roll banding even peels off and scraps.Therefore, the cracking that cold roll will have opposing because bending, reversing, shear-stress causes and the ability of peeling off, also will have high wear resistance, contact fatigue strength, fracture toughness property and thermal shock strength etc. simultaneously.
The material that domestic and international cold roll generally uses has GCr5,9Cr2,9Cr, 9CrV, 9Cr2W, 9Cr2Mo, 60CrMoV, 80CrNi3W, 8CrMoV, 86CrMoV7, Mo3A etc.In order to reduce consumption of heavily quenching, improve the depth of hardening zone of roll, contact fatigue strength, toughness, extend its work-ing life, simultaneously also for meeting the further requirement of rolled piece to cold roll mechanical property and use properties, in the eighties in 20th century, later stage, external roll factory has carried out the Optimization Work of chemical composition to 5%Cr cold roller steel, mainly in 5%Cr steel, increase molybdenum, the content of vanadium or add titanium, the elements such as nickel, in finished heat treatment process, the quenching of breaker roll steel and add thermal limit, then cooling strong is as far as possible carried out, obtain darker quench-hardened case.Finally, by low-temperaturetempering, roller surface hardness is adjusted to prescribed value.
Along with the development of steel rolling technology, rolling mill speed and level of automation, and the improving constantly of milling train sheet material rolling load, the wear resistance of breaker roll quality particularly roll.Intensity and toughness are had higher requirement.Therefore, develop high-quality high-quality Material Used in Supporting Roll to the domestic rolling technical progress of industry of promotion, improve the international competitiveness of roll material product, all there is very great economic implications and public and social interest's effect.
Summary of the invention
The present invention is by improving the alloying constituent of cold roll, the alloying elements such as the expensive tungsten of part, molybdenum, vanadium, niobium and cobalt are replaced with the boron of cheapness, promote increasing substantially of the hardness of the obvious reduction of roll cost and roll, homogeneity, intensity level performance, and the heat-treat condition optimized according to the feature of alloy in roll preparation process, effectively reduces preparation energy consumption.The consumption of the alloying elements such as expensive niobium, cobalt, nickel is reduced in roll material, and the add-on of tungsten, molybdenum, vanadium is also fewer, the cold roll prepared has the feature of high uniformity, high rigidity, high strength, high-wearing feature and low cost, has good economic and social benefit.
For achieving the above object, technical scheme provided by the present invention is:
A preparation method for cold roll, has following steps:
1) by the weight ratio designed in advance by carbon, silicon, manganese, boron, phosphorus, sulphur, chromium, molybdenum, vanadium and, nickel, iron is placed in melting in medium-frequency induction furnace, abundant stirring, smelting temperature is 500-1000 DEG C, smelting time is 30-40 minute, smelts and meets the requirements to chemical composition ranges, tap, external refining, make gas content reach international requirement through vacuum stripping process, and after through esr process, the non-metallic inclusion content such as S, P are met international standards requirement, make alloy liquid;
2) open the hole of coming down in torrents of described medium-frequency induction furnace, alloy liquid is cast in metal die;
3) after cooling completely, described metal die is removed, form blank;
4) by described blank forging molding on press, forging process is: 1100 ~ 1150 DEG C of heating, and initial forging temperature is 1050 ~ 1100 DEG C, final forging temperature >=820 DEG C;
5) UT (Ultrasonic Testing) is carried out after annealing;
6) rough turn processing, UT (Ultrasonic Testing);
7) semi-finishing, UT (Ultrasonic Testing);
8) isothermal annealing after forging: add temperature 810 ~ 840 DEG C, insulation 4h, isothermal temperature is 670 ~ 690 DEG C, insulation 6h, and stove is chilled to less than 200 DEG C and comes out of the stove;
9) sub-zero treatment;
10) defrost, tempering;
11) precision work, double tempering, UT (Ultrasonic Testing);
12) warehouse-in is detected.
Further, in step 6) after, step 7) semi-finishing before also comprise the step of modifier treatment, holding temperature is 900-950 DEG C, and soaking time is 5-10 hour.
Further, it is characterized in that, in modifier treatment, holding temperature is 930 DEG C, and soaking time is 10 hours.
Further, it is characterized in that, wherein step 9) described in its temperature of sub-zero treatment be-190 DEG C to-195 DEG C, insulation 4-5 hour; Step 10) described in tempering temperature be 100-150 DEG C, the time is 90 hours; Step 11) described in double tempering temperature be 100-120 DEG C, the time is 180 hours.
The present invention gives the cold roll produced by above-mentioned manufacture method, is specially:
A kind of cold roll, is made up of the component of following weight percent: C:0.65 ~ 0.75wt%, Si:0.40 ~ 0.70wt%, Mn:0.50 ~ 0.90wt%, B:0.50 ~ 0.80wt%, P:< .02wt%, S:< 0.015wt%, Cr:3.10 ~ 3.5wt%, Mo:0.25 ~ 0.60wt%, V:0.05 ~ 0.1wt%, Ni:0.10 ~ 0.30wt%, N:0.02 ~ 0.05wt%, surplus is iron and other inevitable impurity.
Further, be made up of the component of following weight percent: C:0.70wt%, Si:0.60wt%, Mn:0.70wt%, B:0.75wt%, P:0.02wt%, S:0.015wt%, Cr:3.30wt%, Mo:0.40wt%, V:0.05wt%, Ni:0.25wt%, N:0.04wt%, surplus is iron and other impurity.The weight percent of other impurity is less than or equal to 0.02%, and comprises lead, tin, arsenic, bismuth.
According to steel grade design mix of the present invention, by V, Nb etc. of cheap element substitution costliness, and coordinated between element and component content optimization, adopt EAF just refine-LF refining-VD degassed-esr-forging-thermal treatment process route, chemical composition analysis and mechanics properties testing are carried out to test steels, microstructure is sorbite+carbide, and grain fineness number is 6 ~ 10 grades; Mechanical property (+550 DEG C of tempering of quenching) is Rm>=1750MPa, Rel>=1550MPa, A
ku2>=11.5J.
The present invention is examined by the use of Heavy Back-Up Roll.Steel grade of the present invention has the following advantages:
1, cost performance is high, optimizes steel grade mechanical property.Compared with existing roll matter steel, manufacturing cost increase is not very large, and steel grade mechanical property is optimized by a relatively large margin, and compared with imported materials and items, production cost declines fairly obvious.Achieve the obdurability of instrument steel grade, the optimum matching of cost performance.
2, use properties is excellent.Compared with existing roll stell, hardness, wear resistance, depth of hardening zone and plasticity and toughness all have and improve in various degree, and the test such as the fatigue test of component shows, its use properties is excellent.
3, the production of steel grade, preparation technology are simple.Compared with traditional non-hardened and tempered steel, adopt electric furnace just to refine-LF refining-esr-forging process route, production technique is easy to control and grasp, and quality of item and structure property reach the requirement of regulation.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Cold roll of the present invention, is characterized in that, is made up of: C:0.65 ~ 0.75wt% the component of following weight percent, Si:0.40 ~ 0.70wt%, Mn:0.50 ~ 0.90wt%, B:0.50 ~ 0.80wt%, P:0.0001 ~ 0.02wt%, S:0.0001 ~ 0.015wt%, Cr:3.10 ~ 3.505wt%, Mo:0.25 ~ 0.60wt%, V:0.05 ~ 0.1wt%, Ni:0.10 ~ 0.30wt%, N:0.02 ~ 0.05wt%, surplus is iron and other impurity.
Wherein, chemical composition carbon content is the important alloying element in steel, being by being solid-solubilized in the matrix of steel, playing the strengthening effect to steel, and other elements simultaneously in part carbon and steel form carbide, plays strengthening and increases the effect of wear resistance.The degree of supersaturation of carbon is lower, then matrix hardness reduces more, namely the intensity of steel and wear resisting property poorer, but too much carbon enters sosoloid, makes M
2c atomic ratio reduces, thus makes its anti-temper resistance reduce and cause fragility and fatigue cracking.According to calculating and experiment, the carbon content 0.65-0.75 in steel of the present invention is comparatively suitable.The precipitation strength adding the solution strengthening can played and have enhancing concurrently and the carboritride forming high stable of nitrogen, can delay M
23c
6the effect that silicon carbide thing is separated out, obviously strengthens its obdurability.
Chemical composition chromium content can improve mechanical property and wear resistance, the hardness of increase steel, elasticity, the corrosion-resistant and thermotolerance of steel, improves the hardening capacity on surface; But its shortcoming is reduction of the toughness of roll while improving.Chemical composition content of vanadium can thinning microstructure crystal grain, improves intensity and the toughness of steel, and the carbide that vanadium and carbon are formed can improve the economy that resistant to hydrogen corrosive power considers cold roll steel at high temperature under high pressure, and the present invention selects V content to be 0.05 ~ 0.1%.The content of chemical composition molybdenum can make the grain refining of steel, improves surperficial hardening capacity and thermostrength, roll at high temperature time keep enough intensity and creep resisting ability, the mechanical property of roll can be improved.Chemical composition nickel content is one of important element in steel, can strengthen the hardness of steel, elasticity, ductility and erosion resistance, and can crystal grain thinning, improve surperficial hardening capacity, make steel have high mechanical property, when nickel and chromium coexist, greatly can improve the physical strength of steel.Chemical composition silicone content can significantly improve the elastic limit of steel, yield-point and tensile strength.
The precipitation of alloy carbide: second-phase fusing point is higher, the precipitation hardening intensity of generation is higher, and sclerization is more stable.By experiment repeatedly, obtain the best in quality proportioning of above each component, in the present invention, add appropriate V, VC, V that N element is formed
4c
3with small and dispersed particles such as M (C, N), coherence can be kept to contact with matrix, improve its resistant to aggregation ability and resistant slide deformability, add the obdurability of steel, reach the best use properties of cold roll.
embodiment 1
Be carbon: 0.65wt% according to weight ratio, silicon: 0.4wt%, manganese: 0.5wt%, boron 0.5wt%, phosphorus: 0.02wt%, sulphur: 0.015wt%, chromium: 3.1wt%, molybdenum: 0.25wt%, vanadium: 0.05wt%, nickel: 0.10wt%, nitrogen: 0.02wt%, surplus is iron and other impurity, and other impurity lead, tin, arsenic, bismuth etc. are all not more than 0.02%, prepares cast material.
Molten alloy solution: each component is placed in melting in medium-frequency induction furnace by above-mentioned weight ratio, smelting temperature is 500 DEG C, smelting time is 30 minutes, smelting to chemical composition ranges meets the requirements, tapping, external refining, makes gas content reach international requirement through vacuum stripping process, and after through esr process, the non-metallic inclusion content such as S, P are met international standards requirement, make alloy liquid.
Detect: the alloy liquid adopting spectroscopic analysis detection melting to complete, determine that its composition is within scope.
Casting cold cogging: the hole of coming down in torrents of opening described power frequency holding furnace, is cast in alloy liquid in metal die, is removed by described metal die after cooling completely.Scrub forging: scrub operation by pickling, removing remained on surface and oxide compound, forging molding on press.Forging process is: 1100 DEG C of heating, initial forging temperature is 1050 DEG C, final forging temperature >=820 DEG C.
Annealing, UT (Ultrasonic Testing): after annealing, utilize ultrasonic energy to penetrate the depths of metallic substance, and when entering another cross section by a cross section, the feature that reflection occurs in interface edge checks part defect.Then carry out rough turn processing, repeat above-mentioned UT (Ultrasonic Testing).Carry out modifier treatment afterwards.
Modifier treatment: carry out conditioning heat treatment before quenching, can obtain tiny, organize uniformly, make core of the roll and roll neck reach good mechanical properties, the yield tensile ratio of roll improved, effectively improve roll fatigue lifetime; Do tissue for later stage roller surface quenching to prepare, after modified, roll parts carbide dispersion is separated out simultaneously, and these carbide, in final hard surfacing, are more prone to dissolve; And can matrix be improved, especially the distribution of carbide.Add temperature 810 DEG C, insulation 4h, isothermal temperature is 670 DEG C, and insulation 6h, stove is chilled to less than 200 DEG C and comes out of the stove, and surface hardness can reach 54-56HSD, and roll mechanical property increases thereupon.
Semi-finishing, UT (Ultrasonic Testing) is carried out: according to processing drawing requirement after modifier treatment, lathe carries out semi-finishing, utilize ultrasonic energy to penetrate the depths of metallic substance, and when entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.Then quench.
Quenching: on quenching machine, by the roll through preheating, time in the induction coil of energising, because electromagnetic induction forms induced current at roller surface, thus surface is heated, by thermometric feedback adjustment power regulation Heating temperature, roller surface is made to obtain certain depth of hardening zone and good uniformity of hardness, by average tempering, roll internal stress is reduced, reduce peeling off in work roll cooling, substantially increase the usability of intermediate roll.
Quenching temperature is 960 DEG C.Then sub-zero treatment is carried out.
Sub-zero treatment: the cryostat, that this operation makes the roll before by tempering after quenching put into-190 DEG C carries out the process that deep cooling is incubated 4 hours, because the increase of chromium content can cause poor toughness, on the content basis of chromium of the present invention and carbon, the cryogenic temperature of-190 to-195 DEG C can reduce the residual austenite content in roll, reach the wear resistance of roller surface, high rigidity and raising depth of hardening zone, too increase toughness simultaneously, improve the resistance to flaking of roll in the later stage uses, reduce the risk of fracture of roller.
Then defrost, tempering is carried out: tempering at 100 DEG C after defrost, tempering time 60 hours.
Then precision work, double tempering, UT (Ultrasonic Testing) is completed: double tempering after finish turning processing, tempering temperature 100 DEG C, tempering time 180 hours.Utilize ultrasonic energy to penetrate the depths of metallic substance, and when entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.
According to roll prepared by above-mentioned production technique, depth of hardening zone reaches 35mm, and body surface hardness value is reaching 102HSD, and hardness uniformity coefficient is less than 1.5HSD, and the working roll that can be used for the very thin material of rolling uses.The replacement cycle of roll is increased to 42 kilometers from 25 kilometers, and can roll out the very thin material of high precision.
embodiment 2
Be carbon: 0.75wt% according to weight ratio, silicon: 0.70wt%, manganese: 0.90wt%, boron: 0.80wt%, phosphorus: 0.02wt%, sulphur: 0.015wt%, chromium: 3.5wt%, molybdenum: 0.60wt%, vanadium: 0.1wt%, nickel: 0.30wt%, nitrogen: 0.05wt%, surplus is iron and other impurity, and other impurity lead, tin, arsenic, bismuth etc. are all not more than 0.02%, prepares cast material.
Molten alloy solution: each component is placed in melting in medium-frequency induction furnace by above-mentioned weight ratio, smelting temperature is 1000 DEG C, smelting time is 40 minutes, smelting to chemical composition ranges meets the requirements, tapping, external refining, makes gas content reach international requirement through vacuum stripping process, and after through esr process, the non-metallic inclusion content such as S, P are met international standards requirement, make alloy solution.
Detect: the alloy liquid adopting spectroscopic analysis detection melting to complete, determine that its composition is within scope.
Casting cold cogging: the hole of coming down in torrents of opening described power frequency holding furnace, is cast in alloy liquid in metal die, is removed by described metal die after cooling completely.
Scrub forging: scrub operation by pickling, removing remained on surface and oxide compound, forging molding on press.Forging process is 1150 DEG C of heating, and initial forging temperature is 1100 DEG C, final forging temperature >=820 DEG C
Annealing, UT (Ultrasonic Testing): after annealing, utilize ultrasonic energy to penetrate the depths of metallic substance, and when entering another cross section by a cross section, the feature that reflection occurs in interface edge checks part defect.Then carry out rough turn processing, repeat above-mentioned UT (Ultrasonic Testing).Carry out modifier treatment afterwards.
Modifier treatment: add temperature 840 DEG C, insulation 4h, isothermal temperature is 690 DEG C, and insulation 6h, stove is chilled to less than 200 DEG C and comes out of the stove.
Semi-finishing, UT (Ultrasonic Testing) is carried out: according to processing drawing requirement after modifier treatment, lathe carries out semi-finishing, utilize ultrasonic energy to penetrate the depths of metallic substance, and when entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.Then quench.
Quenching: quenching temperature is 960 DEG C.Then sub-zero treatment is carried out.
Sub-zero treatment: the cryostat, roll after quenching before tempering being put into-195 DEG C carries out deep cooling and is incubated 5 hours.
Then defrost, tempering is carried out: tempering at 150 DEG C after defrost, tempering time 90 hours.
Then complete precision work, double tempering, UT (Ultrasonic Testing): double tempering after finish turning processing, tempering temperature 120 DEG C, tempering time 180 is hour.Utilize ultrasonic energy to penetrate the depths of metallic substance, and when entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.
According to roll prepared by above-mentioned production technique, depth of hardening zone reaches 40mm, and body surface hardness value is reaching 100HSD, and hardness uniformity coefficient is less than 1.5HSD, and the working roll that can be used for the very thin material of rolling uses.The replacement cycle of roll is increased to 42 kilometers, and can roll out the very thin material of high precision.
embodiment 3
Be carbon: 0.70wt% according to weight ratio, silicon: 0.60wt%, manganese: 0.60wt%, boron: 0.75wt%, phosphorus: 0.02wt%, sulphur: 0.015wt%, chromium: 3.3wt%, molybdenum: 0.4wt%, vanadium: 0.05wt%, nickel: 0.25wt%, nitrogen 0.04wt%: surplus is iron and other impurity, other impurity lead, tin, arsenic, bismuth etc. are all not more than 0.02%, prepare cast material.
Molten alloy solution: each component is placed in melting in medium-frequency induction furnace by above-mentioned weight ratio, smelting temperature is 1000 DEG C, smelting time is 40 minutes, smelting to chemical composition ranges meets the requirements, tapping, external refining, makes gas content reach international requirement through vacuum stripping process, and after through esr process, the non-metallic inclusion content such as S, P are met international standards requirement, make alloy solution.
Detect: the alloy liquid adopting spectroscopic analysis detection melting to complete, determine that its composition is within scope.
Casting cold cogging: the hole of coming down in torrents of opening described power frequency holding furnace, is cast in alloy liquid in metal die, is removed by described metal die after cooling completely.
Scrub forging: scrub operation by pickling, removing remained on surface and oxide compound, forging molding on press.Forging process is: 1140 DEG C of heating, and initial forging temperature is 1080 DEG C, final forging temperature >=820 DEG C;
Annealing, UT (Ultrasonic Testing): after annealing, utilize ultrasonic energy to penetrate the depths of metallic substance, and when entering another cross section by a cross section, the feature that reflection occurs in interface edge checks part defect.Then carry out rough turn processing, repeat above-mentioned UT (Ultrasonic Testing).Carry out modifier treatment afterwards.
Modifier treatment: add temperature 820 DEG C, insulation 4h, isothermal temperature is 670 DEG C, and insulation 6h, stove is chilled to less than 200 DEG C and comes out of the stove.
Semi-finishing, UT (Ultrasonic Testing) is carried out: according to processing drawing requirement after modifier treatment, lathe carries out semi-finishing, utilize ultrasonic energy to penetrate the depths of metallic substance, and when entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.Then quench.
Quenching: quenching temperature is 960 DEG C.Then sub-zero treatment is carried out.
Sub-zero treatment: the cryostat, roll after quenching before tempering being put into-190 DEG C carries out deep cooling and is incubated 5 hours.
Then defrost, tempering is carried out: tempering at 150 DEG C after defrost, tempering time 90 hours.
Then complete precision work, double tempering, UT (Ultrasonic Testing): double tempering after finish turning processing, tempering temperature 100 DEG C, tempering time 180 is hour.Utilize ultrasonic energy to penetrate the depths of metallic substance, and when entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.
According to roll prepared by above-mentioned production technique, depth of hardening zone reaches 45mm, and body surface hardness value is reaching 102HSD, and hardness uniformity coefficient is less than 1.5HSD, and the working roll that can be used for the very thin material of rolling uses.The replacement cycle of roll is increased to 42 kilometers, and can roll out the very thin material of high precision.
Rm, Rel, A of each embodiment
ku2list in table 1 etc. each performance perameter, can find out that the roll of embodiment 3 obtains optimum over-all properties.
table 1
| No. | Rm（MPa） | Rel（MPa） | A ku2（J） |
| 1 | 1790 | 1575 | 12.1 |
| 2 | 1750 | 1550 | 11.5 |
| 3 | 1840 | 1594 | 12.5 |
The above embodiment only have expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (7)
1. a preparation method for large-scale cold roller, has following steps:
1) by the weight ratio designed in advance, carbon, silicon, manganese, boron, phosphorus, sulphur, chromium, molybdenum, vanadium, nickel and iron are placed in melting in medium-frequency induction furnace, abundant stirring, smelting temperature is 500-1000 DEG C, smelting time is 30-40 minute, smelt and meet the requirements to chemical composition ranges, tap, external refining, through vacuum stripping process, esr process, make alloy liquid;
2) open the hole of coming down in torrents of described medium-frequency induction furnace, alloy liquid is cast in metal die;
3) after cooling completely, described metal die is removed, form blank;
4) by described blank forging molding on press, forging process is: 1100 ~ 1150 DEG C of heating, and initial forging temperature is 1050 ~ 1100 DEG C, final forging temperature >=820 DEG C;
5) UT (Ultrasonic Testing) is carried out after annealing;
6) rough turn processing, UT (Ultrasonic Testing);
7) semi-finishing, UT (Ultrasonic Testing);
8) isothermal annealing after forging: add temperature 810 ~ 840 DEG C, insulation 4h, isothermal temperature is 670 ~ 690 DEG C, insulation 6h, and stove is chilled to less than 200 DEG C and comes out of the stove;
9) sub-zero treatment;
10) defrost, tempering;
11) precision work, double tempering, UT (Ultrasonic Testing);
12) warehouse-in is detected.
2. method according to claim 1, is characterized in that: in step 6) after, step 7) semi-finishing before also comprise the step of modifier treatment, holding temperature is 900-950 DEG C, and soaking time is 5-10 hour.
3. method according to claim 1, is characterized in that: in modifier treatment, and holding temperature is 930 DEG C, and soaking time is 10 hours.
4. method according to claim 1, is characterized in that: wherein step 9) described in its temperature of sub-zero treatment be-190 to-195 DEG C, insulation 4-5 hour; Step 10) described in tempering temperature be 100-150 DEG C, the time is 90 hours; Step 11) described in double tempering temperature be 100-120 DEG C, the time is 180 hours.
5. method according to claim 1, it is characterized in that: described weight ratio is, C:0.65 ~ 0.75wt%, Si:0.40 ~ 0.70wt%, Mn:0.50 ~ 0.90wt%, B:0.50 ~ 0.80wt%, P:< .02wt%, S:< 0.015wt%, Cr:3.10 ~ 3.5wt%, Mo:0.25 ~ 0.60wt%, V:0.05 ~ 0.1wt%, Ni:0.10 ~ 0.30wt%, N:0.02 ~ 0.05wt%, surplus is iron and other inevitable impurity.
6. method according to claim 1, is characterized in that: described weight ratio is, C:0.70wt%, Si:0.60wt%, Mn:0.60wt%, B:0.75wt%, P:0.02wt%, S:0.015wt%, Cr:3.3wt%, Mo:0.4wt%, V:0.05wt%, Ni:0.25wt%, N:0.04wt%, surplus is iron and other impurity.
7. the weight percent of other impurity is less than or equal to 0.02%, and comprises lead, tin, arsenic, bismuth.
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