CN103173688B - High-hardness impact-resistant cold rolled steel working roll and processing technique thereof - Google Patents
High-hardness impact-resistant cold rolled steel working roll and processing technique thereof Download PDFInfo
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Abstract
The invention discloses a high-hardness impact-resistant cold rolled steel working roll. The working roll adopts low-alloy high-strength steel, and the low-alloy high-strength steel comprises chemical components (C, Si, Mn, Cr, Mo, V, Ti, S and P) and the balance of Fe and inevitable impurities. The processing technique of the cold rolled steel working roll comprises the following steps of: teeming, forging forming, heat treatment after forging, machining for forming, ultrasonic flaw detection, modulating treatment, preheating, line-frequency induction treatment, tempering, finish machining, ultrasonic flaw detection, coarse grinding of grinding machine, finish machining for modifying R, ultrasonic surface flaw detection, hardness detection of finished product, and packaging and storing. In the chemical component proportion of the cold rolled steel working roll, Si and Mn with lower price are selected to improve the hardenability of the material and change the bainite in material tissues, the form distributed tissues has higher stability, tenacity, crack initiation resistance capability, as well as high crack propagation resistance capability.
Description
Technical field
The present invention relates to a kind of cold roll, be specifically related to the shock-resistant cold-rolled steel working roll of a kind of high rigidity and complete processing thereof.
Background technology
The cold-rolling process of steel, in starting from Germany in the middle of the 19th century, can only produce soft steel 20 ~ 25mm arrowband at that time, and the U.S. successfully rolls out wide steel strip as far back as first time nineteen twenty.Nineteen twenty-four builds up first set three frame four roller tandem cold-mill in the world at Armco Steel Corp.'s Butler (Bulter) of the U.S., builds five frame tandem cold-mills from the fifties in last century the U.S..For thinner zinc-plated former of rolling, the beginning of the sixties in last century, U.S. Yang Si Dun Banguan company built up first set six Stands Cold Tandem Mill in the world.The combine processes fully continuous line (FIPL) of nippon Guang field factory, the ， Guang field factory output after FIPL line is gone into operation that went into operation in 1986 is increased sharply, and the rate of utilization of work hour is up to 95%, and recovery rate increases to 96.9%, and energy consumption declines 40%.Pickling-cold rolling-continuous annealing and finishing are realized completely continuous manufacturing in the whole world by this factory FIPL first.
The production of China's cold-rolled wide strip steel starts from nineteen sixty, first establishes 1700mm single stand reversible cold-rolling mill, 1200mm single stand reversible cold-rolling mill of later having gone into operation successively, MKW MKW mill, 1150mm Sendzimir Sendzimir mill.China first set 1700mm five frame of having gone into operation the seventies in last century cold-rolling mill, has built up 2030mm five frame cold tandem mill for 1988.Cold continuous rolling be developed so far have that Total continuity is cold rolling, fast roll changing, hydraulic pressing, roll bending system and the new technology such as control automatically.High precision cold belt and Strip Shape Control technology and computer Whole Process Control technology are used widely, and roll speed is up to 35-41.6m/s, and maximum volume-weight reaches 60t.
Modern industry is more and more high to the specification of quality of cold rolled sheet steel, requires more and more extensive to kind, and also more and more large to output demand, thus the production increase of cold rolled sheet is very fast.The output of cold rolled sheet has accounted for about 30% of steel ultimate production in industrially developed country.From China in 1996, steel annual production reached more than 100,000,000 tons, always steady according to World Steel output first.Within 2004, reach 24529.3 ten thousand tons to China's output of steel in November according to statistics, estimate that annual output of steel reaches more than 2.7 hundred million tons, its total amount has reached nearly 30% of the total steel output in the whole world, but at rolling shapes with also there is certain gap with developed countries qualitatively.China's import in first 11 months 7,600,000 tons of cold rolled sheets, 559.8 ten thousand tons of Coated Steel Sheets, 151.8 ten thousand tons of electrical sheets.And the outlet of the same period is less, illustrate that domestic cold rolled strip is still in the state that supply falls short of demand, domestic breach is larger.
Cold roll (hereinafter referred to as cold roll) is the main consumable part of cold-rolling mill, and the quality of its quality plays very important effect to the quality of cold rolled sheet, cost, output.Therefore, cold rolling mill and roll factory all spare no effort to improve the use properties of roll.These performances comprise intensity, hardness, toughness, wear resistance and anti-accident performance etc.Along with the development of modern cold-rolling mill maximization, high speed, cold roll steel changes from traditional chromium steel system to high quality steel, and the performance of cold roll has increased significantly, and steel grade and manufacture method also present the trend of diversification.Current high-performance cold rolled roller has good dense structure's degree, and depth of hardening zone can reach more than 50mm (radius), and practical quench-hardened case reaches more than 30mm.But in order to make the further improvement of the exploitation of related products of the same trade and product performance, drive the development of milling train industry and the upstream and downstream firms relevant to milling train industry simultaneously; And the raising of the quality of cold roll own and production efficiency, and the improvement of technique can realize the further reduction of energy consumption and cost, so both can meet the developing direction of national economy, can reduce again the pollution in production process in addition.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, there is provided a kind of depth of hardening zone effectively can control according to frequency and heat-up time, quench-hardened case gradient is mild, rate of heating is fast, thermosteresis is few, pollution-free, energy-conservation, and product heat treatment deformation amount is little, with low cost, the shock-resistant cold-rolled steel working roll of high rigidity that the process-cycle is short and complete processing thereof.
For achieving the above object, technical scheme of the present invention is the shock-resistant cold-rolled steel working roll of a kind of high rigidity of design, it is characterized in that, described working roll adopts Hi-Stren steel, the chemical composition contained in described Hi-Stren steel be respectively by weight percentage 0.6% ~ 0.65% C, 1.5% ~ 1.8% Si, 1.7% ~ 1.85% Mn, 1.8% ~ 2.0% Cr, 0.2% ~ 0.4% Mo, 0.06% ~ 0.08% V, 0.06% ~ 0.08% Ti, be less than or equal to 0.025% S and P, all the other are Fe and not removable impurity.
Wherein preferred technical scheme is that in described chemical composition, the mass ratio of Si and Mn is 1:1 ~ 1:1.15.
Further preferred technical scheme is, also containing the≤oxygen of 15ppm and the hydrogen of≤1.5ppm in described Hi-Stren steel.
Another object of the present invention is the complete processing of the shock-resistant cold-rolled steel working roll of a kind of above-mentioned high rigidity, it is characterized in that, described complete processing comprises teeming, forging molding, heat treatment after forging, de-black skin, machining, UT (Ultrasonic Testing), modulation treatment, UT (Ultrasonic Testing), preheating, line-frequency induction quenching, tempering, precision work, UT (Ultrasonic Testing), grinding machine corase grind, the precision work carried out successively and repaiies R, grinding machine corase grind, ultrasonic surface flaw detection, finished product hardness determination size detection and packaging warehouse-in.
Wherein preferred technical scheme is that above-mentioned raw materials is first dropped into electric furnace by described teeming technique, and then is adopted by molten liquid steel external refining and esr to carry out refining treatment, finally by vacuum argon blowing ingot casting.
Preferred technical scheme also has, described heat treatment after forging technique comprises workpiece heat of having no progeny to 650 degree, be incubated and be warming up to 900 degree after 3 hours, then air cooling after being incubated 10 ~ 12 hours, air cooling is to putting into stove isothermal 3 hours after 250 degree, and then be warming up to 450 degree and be incubated 3 hours, be warming up to 650 degree again, then be incubated 3 hours, and then be warming up to 720 degree, after being incubated 12 ~ 15 hours again, stop insulation until stove is cold be less than 350 degree after to come out of the stove air cooling.
Preferred technical scheme also has, described pre-heating technique comprises: workpiece is put into process furnace and be heated to 350 degree, be incubated 2 hours, be warming up to 450 degree again, be incubated 2 hours again, then be warming up to 650 degree, then be incubated 3 hours, be warming up to 890 degree again, be incubated 6-7 hour again, come out of the stove air-cooled to being less than 250 degree, reentering stove and being warming up to 350 degree, be incubated 2 hours again, be warming up to 450 degree again, then be incubated 2 hours, then be warming up to 600 degree, be incubated 8 hours again, come out of the stove air cooling after stopping insulation stove in stove to be cooled to being less than 400 degree.
Preferred technical scheme also has, described line-frequency induction quenching technology comprises: first workpiece is put into cabinet-type electric furnace and be heated to 500 degree, then 6 hours are incubated, again work piece hoisting is put in intermediate frequency multi-turn electric heater unit, by power frequency and the heat-up time of adjustment multi-turn electric heater unit, reach and control heat penetration to 70 ~ 100mm, and make body of roll temperature reach 880 degree and after insulation, enter water-jet and workpiece is cooled fast.
Preferred technical scheme also has further, and described intermediate frequency multi-turn electric heater unit and water-jet are the integrative-structure in distributing up and down.
Preferred technical scheme also has, the low-temperaturetempering technique that described tempering process adopts box low-temperature bake oven to carry out 20 ~ 36 hours.
Advantage of the present invention and beneficial effect are:
1) due in the chemical composition proportioning of this cold-rolled steel working roll material, select price lower Si, Mn to improve the hardening capacity of material, and the bainite changed in material structure, this fractions distribution tissue has higher stability, obdurability, cracking resistance line sprouting ability, and also has very high resistance to crack extension ability.
2) this cold-rolled steel working roll is finally quenched by induction diathermic formula differential quenching device.According to the height of frequency and the control of heat-up time, surface heating is carried out to roll surface.Again by Quench water-spraying control.The product surface hardness obtained is high, it is little to be out of shape, and surface structure crystal grain is tiny, and notch sensitivity is little, and the wear resistance of its working roll is improved greatly.
3) depth of hardening zone of this cold-rolled steel working roll effectively can control to reach 30-100mm according to frequency and heat-up time.
4) the quench-hardened case gradient of this cold-rolled steel working roll is mild, is similar to integral quenching gradient.
5) this cold-rolled steel working roll rate of heating in quenching technology is fast, and thermosteresis is few, pollution-free, energy-conservation.
6) the heat treatment deformation amount of this cold-rolled steel working roll is less than 100s.
7) due to this cold-rolled steel working roll deflection, raw-material cost and metalworking cost can effectively be reduced.
8) complete processing of this cold-rolled steel working roll is adopted to shorten the process-cycle.
9) this cold-rolled steel working roll is while quality product improves, and production cost obtains effective control.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
Embodiment 1
The present invention is the shock-resistant cold-rolled steel working roll of a kind of high rigidity, this working roll adopts Hi-Stren steel, the chemical composition contained in Hi-Stren steel be respectively by weight percentage 0.6% C, 1.5% Si, 1.7% Mn, 1.8% Cr, 0.2% ~ Mo, 0.06% V, 0.06% Ti, be less than or equal to 0.025% S and P, all the other are Fe and not removable impurity.
Wherein preferred embodiment is that in chemical composition, the mass ratio of Si and Mn is 1:1.
Further preferred embodiment is, the hydrogen of the oxygen also containing≤15ppm in Hi-Stren steel and≤1.5ppm.
A complete processing for the shock-resistant cold-rolled steel working roll of above-mentioned high rigidity, this complete processing comprises teeming, forging molding, heat treatment after forging, de-black skin, machining, UT (Ultrasonic Testing), modulation treatment, UT (Ultrasonic Testing), preheating, line-frequency induction quenching, tempering, precision work, UT (Ultrasonic Testing), grinding machine corase grind, the precision work carried out successively and repaiies R, grinding machine corase grind, ultrasonic surface flaw detection, finished product hardness determination size detection and packaging warehouse-in.
Wherein preferred embodiment is that above-mentioned raw materials is first dropped into electric furnace by teeming technique, and then is adopted by molten liquid steel external refining and esr to carry out refining treatment, finally by vacuum argon blowing ingot casting.
Preferred embodiment also has, state heat treatment after forging technique to comprise workpiece heat of having no progeny to 650 degree, be incubated and be warming up to 900 degree after 3 hours, then air cooling after being incubated 10 hours, air cooling is to putting into stove isothermal 3 hours after 250 degree, and then be warming up to 450 degree and be incubated 3 hours, be warming up to 650 degree again, then be incubated 3 hours, and then be warming up to 720 degree, after being incubated 12 hours again, stop insulation until stove is cold be less than 350 degree after to come out of the stove air cooling.
Preferred embodiment also has, and pre-heating technique comprises: workpiece is put into process furnace and be heated to 350 degree, is incubated 2 hours, be warming up to 450 degree again, then be incubated 2 hours, then be warming up to 650 degree, be incubated 3 hours again, then be warming up to 890 degree, then be incubated 6 hours, coming out of the stove air-cooled to being less than 250 degree, reentering stove and being warming up to 350 degree, then being incubated 2 hours, be warming up to 450 degree again, then be incubated 2 hours, then be warming up to 600 degree, be incubated 8 hours again, come out of the stove air cooling after stopping insulation stove in stove to be cooled to being less than 400 degree.
Preferred embodiment also has, line-frequency induction quenching technology comprises: first workpiece is put into cabinet-type electric furnace and be heated to 500 degree, then 6 hours are incubated, again work piece hoisting is put in intermediate frequency multi-turn electric heater unit, by power frequency and the heat-up time of adjustment multi-turn electric heater unit, reach and control heat penetration to 70 ~ 100mm, and make body of roll temperature reach 880 degree and after insulation, enter water-jet and workpiece is cooled fast.
Further preferred embodiment also has, and intermediate frequency multi-turn electric heater unit and water-jet are the integrative-structure in distributing up and down.
Preferred embodiment also has, the low-temperaturetempering technique that tempering process adopts box low-temperature bake oven to carry out 20 hours.
Embodiment 2
The shock-resistant cold-rolled steel working roll of a kind of high rigidity, this working roll adopts Hi-Stren steel, the chemical composition contained in Hi-Stren steel be respectively by weight percentage 0.65% C, 1.8% Si, 1.85% Mn, 2.0% Cr, 0.4% Mo, 0.08% V, 0.08% Ti, be less than or equal to 0.025% S and P, all the other are Fe and not removable impurity.
Wherein preferred technical scheme is that in described chemical composition, the mass ratio of Si and Mn is 1:1.15.
Further preferred embodiment is, the hydrogen of the oxygen also containing≤15ppm in Hi-Stren steel and≤1.5ppm.
A complete processing for the shock-resistant cold-rolled steel working roll of above-mentioned high rigidity, this complete processing comprises teeming, forging molding, heat treatment after forging, de-black skin, machining, UT (Ultrasonic Testing), modulation treatment, UT (Ultrasonic Testing), preheating, line-frequency induction quenching, tempering, precision work, UT (Ultrasonic Testing), grinding machine corase grind, the precision work carried out successively and repaiies R, grinding machine corase grind, ultrasonic surface flaw detection, finished product hardness determination size detection and packaging warehouse-in.
Wherein preferred embodiment is that above-mentioned raw materials is first dropped into electric furnace by teeming technique, and then is adopted by molten liquid steel external refining and esr to carry out refining treatment, finally by vacuum argon blowing ingot casting.
Preferred embodiment also has, heat treatment after forging technique comprises workpiece heat of having no progeny to 650 degree, be incubated and be warming up to 900 degree after 3 hours, then air cooling after being incubated 12 hours, air cooling is to putting into stove isothermal 3 hours after 250 degree, and then be warming up to 450 degree and be incubated 3 hours, be warming up to 650 degree again, then be incubated 3 hours, and then be warming up to 720 degree, after being incubated 15 hours again, stop insulation until stove is cold be less than 350 degree after to come out of the stove air cooling.
Preferred embodiment also has, and pre-heating technique comprises: workpiece is put into process furnace and be heated to 350 degree, is incubated 2 hours, be warming up to 450 degree again, then be incubated 2 hours, then be warming up to 650 degree, be incubated 3 hours again, then be warming up to 890 degree, then be incubated 7 hours, coming out of the stove air-cooled to being less than 250 degree, reentering stove and being warming up to 350 degree, then being incubated 2 hours, be warming up to 450 degree again, then be incubated 2 hours, then be warming up to 600 degree, be incubated 8 hours again, come out of the stove air cooling after stopping insulation stove in stove to be cooled to being less than 400 degree.
Preferred technical scheme also has, described line-frequency induction quenching technology comprises: first workpiece is put into cabinet-type electric furnace and be heated to 500 degree, then 6 hours are incubated, again work piece hoisting is put in intermediate frequency multi-turn electric heater unit, by power frequency and the heat-up time of adjustment multi-turn electric heater unit, reach and control heat penetration to 70 ~ 100mm, and make body of roll temperature reach 880 degree and after insulation, enter water-jet and workpiece is cooled fast.
Further preferred embodiment also has, and intermediate frequency multi-turn electric heater unit and water-jet are the integrative-structure in distributing up and down.
Preferred embodiment also has, the low-temperaturetempering technique that tempering process adopts box low-temperature bake oven to carry out 36 hours.
Embodiment 3
The shock-resistant cold-rolled steel working roll of a kind of high rigidity, this working roll adopts Hi-Stren steel, the chemical composition contained in described Hi-Stren steel be respectively by weight percentage 0.63% C, 1.75% Si, 1.8% Mn, 1.9% Cr, 0.3% Mo, 0.07% V, 0.07% Ti, be less than or equal to 0.025% S and P, all the other are Fe and not removable impurity.
Wherein preferred embodiment is that in chemical composition, the mass ratio of Si and Mn is 1:1.12.
Further preferred embodiment is, the hydrogen of the oxygen also containing≤15ppm in Hi-Stren steel and≤1.5ppm.
A complete processing for the shock-resistant cold-rolled steel working roll of above-mentioned high rigidity, this complete processing comprises teeming, forging molding, heat treatment after forging, de-black skin, machining, UT (Ultrasonic Testing), modulation treatment, UT (Ultrasonic Testing), preheating, line-frequency induction quenching, tempering, precision work, UT (Ultrasonic Testing), grinding machine corase grind, the precision work carried out successively and repaiies R, grinding machine corase grind, ultrasonic surface flaw detection, finished product hardness determination size detection and packaging warehouse-in.
Wherein preferred embodiment is that above-mentioned raw materials is first dropped into electric furnace by described teeming technique, and then is adopted by molten liquid steel external refining and esr to carry out refining treatment, finally by vacuum argon blowing ingot casting.
Preferred embodiment also has, heat treatment after forging technique comprises workpiece heat of having no progeny to 650 degree, be incubated and be warming up to 900 degree after 3 hours, then air cooling after being incubated 11 hours, air cooling is to putting into stove isothermal 3 hours after 250 degree, and then be warming up to 450 degree and be incubated 3 hours, be warming up to 650 degree again, then be incubated 3 hours, and then be warming up to 720 degree, after being incubated 14 hours again, stop insulation until stove is cold be less than 350 degree after to come out of the stove air cooling.
Preferred embodiment also has, and pre-heating technique comprises: workpiece is put into process furnace and be heated to 350 degree, is incubated 2 hours, be warming up to 450 degree again, then be incubated 2 hours, then be warming up to 650 degree, be incubated 3 hours again, then be warming up to 890 degree, then be incubated 6.5 hours, coming out of the stove air-cooled to being less than 250 degree, reentering stove and being warming up to 350 degree, then being incubated 2 hours, be warming up to 450 degree again, then be incubated 2 hours, then be warming up to 600 degree, be incubated 8 hours again, come out of the stove air cooling after stopping insulation stove in stove to be cooled to being less than 400 degree.
Preferred embodiment also has, line-frequency induction quenching technology comprises: first workpiece is put into cabinet-type electric furnace and be heated to 500 degree, then 6 hours are incubated, again work piece hoisting is put in intermediate frequency multi-turn electric heater unit, by power frequency and the heat-up time of adjustment multi-turn electric heater unit, reach and control heat penetration to 70 ~ 100mm, and make body of roll temperature reach 880 degree and after insulation, enter water-jet and workpiece is cooled fast.
Further preferred embodiment also has, and intermediate frequency multi-turn electric heater unit and water-jet are the integrative-structure in distributing up and down.
Preferred embodiment also has, the low-temperaturetempering technique that tempering process adopts box low-temperature bake oven to carry out 28 hours.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. the complete processing of the shock-resistant cold-rolled steel working roll of high rigidity, it is characterized in that, described cold-rolled steel working roll is Hi-Stren steel, the chemical composition contained in Hi-Stren steel is respectively the C of 0.6% ~ 0.65% by weight percentage, the Si of 1.5% ~ 1.8%, the Mn of 1.7% ~ 1.85%, the Cr of 1.8% ~ 2.0%, the Mo of 0.2% ~ 0.4%, the V of 0.06% ~ 0.08%, the Ti of 0.06% ~ 0.08%, be less than or equal to S and P of 0.025%, all the other are Fe and not removable impurity, in described chemical composition, the mass ratio of Si and Mn is 1:1 ~ 1:1.15, the hydrogen of the oxygen also containing≤15ppm in described Hi-Stren steel and≤1.5ppm, described cold-rolled steel working roll complete processing comprises that R is repaiied in teeming, forging molding, heat treatment after forging, de-black skin, machining, UT (Ultrasonic Testing), modulation treatment, UT (Ultrasonic Testing), preheating, line-frequency induction quenching, tempering, precision work, UT (Ultrasonic Testing), grinding machine corase grind, the precision work carried out successively, grinding machine corase grind, ultrasonic surface flaw detection, finished product hardness determination, size detection and packaging are put in storage, described heat treatment after forging technique comprises workpiece heat after forging to 650 degree, be incubated and be warming up to 900 degree after 3 hours, air cooling after being incubated 10 ~ 12 hours again, air cooling to putting into stove isothermal 3 hours after 250 degree, and then is warming up to 450 degree and is incubated 3 hours, be warming up to 650 degree again, be incubated 3 hours again, and then be warming up to 720 degree, then after being incubated 12 ~ 15 hours, stop insulation, air cooling of coming out of the stove after being cooled in stove and being less than 350 degree, described pre-heating technique comprises: workpiece is put into process furnace and be heated to 350 degree, is incubated 2 hours, then is warming up to 450 degree, be incubated 2 hours again, then be warming up to 650 degree, then be incubated 3 hours, being warming up to 890 degree again, then being incubated 6-7 hour, coming out of the stove air-cooled to being less than 250 degree, reenter stove and be warming up to 350 degree, then be incubated 2 hours, then be warming up to 450 degree, be incubated 2 hours again, then be warming up to 600 degree, then be incubated 8 hours, stop insulation, in stove, be cooled to air cooling of coming out of the stove after being less than 400 degree.
2. the complete processing of the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 1, it is characterized in that, raw material is first dropped into electric furnace by described teeming technique, and then is adopted by molten liquid steel external refining and esr to carry out refining treatment, finally by vacuum argon blowing ingot casting.
3. the complete processing of the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 1, it is characterized in that, described line-frequency induction quenching technology comprises: first workpiece is put into cabinet-type electric furnace and be heated to 500 degree, then 6 hours are incubated, again workpiece is hung in intermediate frequency multi-turn electric heater unit, by power frequency and the heat-up time of adjustment multi-turn electric heater unit, reach and control heat penetration to 70 ~ 100mm, and make body of roll temperature reach 880 degree and after insulation, enter water-jet and workpiece is cooled fast.
4. the complete processing of the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 3, is characterized in that, described intermediate frequency multi-turn electric heater unit and water-jet are the integrative-structure in distributing up and down.
5. the complete processing of the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 1, is characterized in that, the low-temperaturetempering technique that described tempering process adopts box low-temperature bake oven to carry out 20 ~ 36 hours.
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| CN103589850B (en) * | 2013-10-31 | 2015-06-24 | 宜兴市鑫源辊业有限公司 | Manufacturing method for scale breaking tension leveler working roll |
| CN104451081A (en) * | 2014-11-24 | 2015-03-25 | 张家港保税区奇利国际贸易有限公司 | Production method for cold-rolled working roller |
| CN108611469A (en) * | 2018-07-11 | 2018-10-02 | 石钢京诚装备技术有限公司 | A kind of heat treatment method of support roll |
| CN111020127A (en) * | 2020-01-08 | 2020-04-17 | 无锡亿宝机械设备有限公司 | Novel heat treatment process for full-hardened cold-rolled working roll |
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