CN103173688A - 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 starts from Germany in the middle of the 19th century, can only produce at that time soft steel 20 ~ 25mm arrowband, and the U.S. successfully rolls out wide steel strip for the first time as far back as nineteen twenty.Nineteen twenty-four, the Armco Steel Corp.'s Butler (Bulter) in the U.S. built up first set three frame four roller tandem cold-mills in the world, and the U.S. builds five frame tandem cold-mills since the fifties in last century.For rolling thinner zinc-plated former, the beginning of the sixties in last century, pause plate pipe company of U.S. Yang Si built up first set six Stands Cold Tandem Mills in the world.The process associating fully continuous line (FIPL) of nippon Guang field factory, the ， Guang field factory output after the 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 descends 40%.The FIPL of this factory realizes completely continuous manufacturing with pickling-cold rolling-continuous annealing and finishing first in the whole world.
The production of China's cold-rolled wide strip steel starts from nineteen sixty, model 1700mm single stand reversible cold-rolling mill, the 1200mm single stand reversible cold-rolling mill of having gone into operation successively later on, MKW MKW mill, 1150mm Sendzimir Sendzimir mill.China first set 1700mm five frame cold-rolling mills of having gone into operation the seventies in last century built up 2030mm five frame cold tandem mills in 1988.The cold continuous rolling development has had the new technologies such as full continuous cold rolling, fast roll changing, hydraulic pressing, roll bending system and automatic control so far.High precision cold belt and plate shape control techniques 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, and is more and more extensive to the kind requirement, also more and more large to the output requirement, thereby the production increase of cold rolled sheet is very fast.The output of cold rolled sheet has accounted for 30% left and right of steel ultimate production in industrially developed country.Reach more than 100,000,000 tons from China in 1996 steel annual production, always surely according to World Steel output first.Reached 24529.3 ten thousand tons to November China output of steel in 2004 according to statistics, estimate that annual output of steel reaches more than 2.7 hundred million tons, its total amount has reached the nearly 30% of the total steel output in the whole world, but at rolling shapes with also have certain gap with developed countries qualitatively.7,600,000 tons of cold rolled sheets of China's import in front 11 months, 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, illustrates that domestic cold rolled strip still is in the state that supply falls short of demand, and domestic breach is larger.
Cold roll (hereinafter to be referred as cold roll) is the main consumable part of cold-rolling mill, and the quality of its quality plays very important effect to quality, cost, the output of cold rolled sheet.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 modern cold-rolling mill maximizes, the development of high speed, cold roll is to change to high quality steel with steel from traditional chromium steel, and the performance of cold roll has increased significantly, and steel grade and manufacture method also present the trend of diversification.Present high-performance cold rolled roller has good dense structure's degree, more than depth of hardening zone can reach 50mm (radius), more than practical quench-hardened case reaches 30mm.Yet for the exploitation that makes related products of the same trade and the further improvement of product performance, drive simultaneously the development of milling train industry and relevant to milling train industry upstream and downstream enterprise; 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 in addition the pollution in production process.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of depth of hardening zone effectively to control according to frequency and heat-up time, the quench-hardened case gradient is mild, rate of heating is fast, thermosteresis is few, and is 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 and complete processing thereof that the process-cycle is short.
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 that contains in described Hi-Stren steel is respectively 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, the S less than or equal to 0.025% and P by weight percentage, and all the other are Fe and the impurity that can not remove.
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 contain in described Hi-Stren steel≤oxygen of 15ppm and≤hydrogen of 1.5ppm.
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, the forging postheat treatment carried out successively, removes casting skin, R is repaiied in machining moulding, UT (Ultrasonic Testing), modulation treatment, UT (Ultrasonic Testing), preheating, line-frequency induction quenching, tempering, precision work, UT (Ultrasonic Testing), grinding machine corase grind, precision work, grinding machine corase grind, ultrasonic surface flaw detection, finished product hardness detect size detection and packing warehouse-in.
Wherein preferred technical scheme is, described teeming technique first drops into electric furnace with above-mentioned raw materials, and then adopts external refining and esr to carry out refining treatment molten liquid steel, at last by the vacuum argon blowing ingot casting.
Preferred technical scheme also has, described forging postheat treatment technique comprises that the workpiece of having no progeny is heated to 650 spends, be incubated and be warming up to 900 degree after 3 hours, then air cooling after being incubated 10 ~ 12 hours, air cooling was put into the stove isothermal 3 hours after spending lower than 250, and then be warming up to 450 degree insulation 3 hours, be warming up to again 650 degree, then be incubated 3 hours, and then be warming up to 720 degree, after being incubated again 12 ~ 15 hours, stop insulation until stove cold less than 350 degree after the air cooling of coming out of the stove.
Preferred technical scheme also has, described pre-heating technique comprises: workpiece is put into process furnace be heated to 350 degree, be incubated 2 hours, be warming up to again 450 degree, be incubated again 2 hours, then be warming up to 650 degree, then be incubated 3 hours, be warming up to again 890 degree, be incubated again 6-7 hour, come out of the stove air-cooled to less than 250 degree, reenter stove and be warming up to 350 degree, be incubated again 2 hours, be warming up to again 450 degree, then be incubated 2 hours, then be warming up to 600 degree, be incubated again 8 hours, stop insulation stove in stove and be cooled to less than the air cooling of coming out of the stove after 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 be incubated 6 hours, again work piece hoisting is put in intermediate frequency multi-turn electric heater unit, by adjusting power frequency and the heat-up time of multi-turn electric heater unit, reach and control heat penetration to 70 ~ 100mm, and make body of roll temperature reach 880 spend and be incubated after, enter water-jet and make workpiece cooling fast.
Further preferred technical scheme also has, and described intermediate frequency multi-turn electric heater unit and water-jet are to be the integrative-structure that distributes 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, selected the lower Si of price, Mn to improve the hardening capacity of material, and changed the bainite in the material structure, this form distributes to organize and 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 finally quenches by induction diathermic formula differential quenching device.According to the height of frequency and the control of heat-up time, roll surface is carried out surface heating.Spray water by Quench more cooling.The product surface hardness that obtains is high, distortion is little, 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 can and effectively be controlled according to frequency and reach 30-100mm heat-up time.
4) the quench-hardened case gradient of this cold-rolled steel working roll is mild, is similar to the integral quenching gradient.
5) this cold-rolled steel working roll rate of heating in quenching technology is fast, and thermosteresis is few, and is 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, can effectively reduce raw-material cost and metalworking cost.
8) adopt the complete processing of this cold-rolled steel working roll to have shortened the process-cycle.
9) this cold-rolled steel working roll is when quality product improves, and production cost has obtained effective control.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present 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 that contains 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, the S less than or equal to 0.025% and P, all the other are Fe and the impurity that can not remove.
Wherein preferred embodiment is that in chemical composition, the mass ratio of Si and Mn is 1:1.
Further preferred embodiment is, also contain in Hi-Stren steel≤oxygen of 15ppm and≤hydrogen of 1.5ppm.
The complete processing of the shock-resistant cold-rolled steel working roll of a kind of above-mentioned high rigidity, this complete processing comprise teeming, forging molding, the forging postheat treatment carried out successively, remove casting skin, R is repaiied in machining moulding, UT (Ultrasonic Testing), modulation treatment, UT (Ultrasonic Testing), preheating, line-frequency induction quenching, tempering, precision work, UT (Ultrasonic Testing), grinding machine corase grind, precision work, grinding machine corase grind, ultrasonic surface flaw detection, finished product hardness detect size detection and packing warehouse-in.
Wherein preferred embodiment is, teeming technique first drops into electric furnace with above-mentioned raw materials, and then adopts external refining and esr to carry out refining treatment molten liquid steel, at last by the vacuum argon blowing ingot casting.
Preferred embodiment also has, state forging postheat treatment technique and comprise that the workpiece of having no progeny is heated to 650 spends, be incubated and be warming up to 900 degree after 3 hours, then air cooling after being incubated 10 hours, air cooling was put into the stove isothermal 3 hours after spending lower than 250, and then be warming up to 450 degree insulation 3 hours, be warming up to again 650 degree, then be incubated 3 hours, and then be warming up to 720 degree, after being incubated again 12 hours, stop insulation until stove cold less than 350 degree after the air cooling of coming out of the stove.
Preferred embodiment also has, and pre-heating technique comprises: workpiece is put into process furnace be heated to 350 degree, be incubated 2 hours, be warming up to again 450 degree, then be incubated 2 hours, then be warming up to 650 degree, be incubated again 3 hours, then be warming up to 890 degree, then be incubated 6 hours, come out of the stove air-cooled to less than 250 degree, reenter stove and be warming up to 350 degree, then be incubated 2 hours, be warming up to again 450 degree, then be incubated 2 hours, then be warming up to 600 degree, be incubated again 8 hours, stop insulation stove in stove and be cooled to less than the air cooling of coming out of the stove after 400 degree.
Preferred embodiment also has, the line-frequency induction quenching technology comprises: first workpiece is put into cabinet-type electric furnace and be heated to 500 degree, then be incubated 6 hours, again work piece hoisting is put in intermediate frequency multi-turn electric heater unit, by adjusting power frequency and the heat-up time of multi-turn electric heater unit, reach and control heat penetration to 70 ~ 100mm, and make body of roll temperature reach 880 spend and be incubated after, enter water-jet and make workpiece cooling fast.
Further preferred embodiment also has, and intermediate frequency multi-turn electric heater unit and water-jet are to be the integrative-structure that distributes 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 that contains in Hi-Stren steel is respectively 0.65% C, 1.8% Si, 1.85% Mn, 2.0% Cr, 0.4% Mo, 0.08% V, 0.08% Ti, the S less than or equal to 0.025% and P by weight percentage, and all the other are Fe and the impurity that can not remove.
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, also contain in Hi-Stren steel≤oxygen of 15ppm and≤hydrogen of 1.5ppm.
The complete processing of the shock-resistant cold-rolled steel working roll of a kind of above-mentioned high rigidity, this complete processing comprise teeming, forging molding, the forging postheat treatment carried out successively, remove casting skin, R is repaiied in machining moulding, UT (Ultrasonic Testing), modulation treatment, UT (Ultrasonic Testing), preheating, line-frequency induction quenching, tempering, precision work, UT (Ultrasonic Testing), grinding machine corase grind, precision work, grinding machine corase grind, ultrasonic surface flaw detection, finished product hardness detect size detection and packing warehouse-in.
Wherein preferred embodiment is, teeming technique first drops into electric furnace with above-mentioned raw materials, and then adopts external refining and esr to carry out refining treatment molten liquid steel, at last by the vacuum argon blowing ingot casting.
Preferred embodiment also has, forge postheat treatment technique and comprise that the workpiece of having no progeny is heated to 650 spends, be incubated and be warming up to 900 degree after 3 hours, then air cooling after being incubated 12 hours, air cooling was put into the stove isothermal 3 hours after spending lower than 250, and then be warming up to 450 degree insulation 3 hours, be warming up to again 650 degree, then be incubated 3 hours, and then be warming up to 720 degree, after being incubated again 15 hours, stop insulation until stove cold less than 350 degree after the air cooling of coming out of the stove.
Preferred embodiment also has, and pre-heating technique comprises: workpiece is put into process furnace be heated to 350 degree, be incubated 2 hours, be warming up to again 450 degree, then be incubated 2 hours, then be warming up to 650 degree, be incubated again 3 hours, then be warming up to 890 degree, then be incubated 7 hours, come out of the stove air-cooled to less than 250 degree, reenter stove and be warming up to 350 degree, then be incubated 2 hours, be warming up to again 450 degree, then be incubated 2 hours, then be warming up to 600 degree, be incubated again 8 hours, stop insulation stove in stove and be cooled to less than the air cooling of coming out of the stove after 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 be incubated 6 hours, again work piece hoisting is put in intermediate frequency multi-turn electric heater unit, by adjusting power frequency and the heat-up time of multi-turn electric heater unit, reach and control heat penetration to 70 ~ 100mm, and make body of roll temperature reach 880 spend and be incubated after, enter water-jet and make workpiece cooling fast.
Further preferred embodiment also has, and intermediate frequency multi-turn electric heater unit and water-jet are to be the integrative-structure that distributes 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 that contains in described Hi-Stren steel is respectively 0.63% C, 1.75% Si, 1.8% Mn, 1.9% Cr, 0.3% Mo, 0.07% V, 0.07% Ti, the S less than or equal to 0.025% and P by weight percentage, and all the other are Fe and the impurity that can not remove.
Wherein preferred embodiment is that in chemical composition, the mass ratio of Si and Mn is 1:1.12.
Further preferred embodiment is, also contain in Hi-Stren steel≤oxygen of 15ppm and≤hydrogen of 1.5ppm.
The complete processing of the shock-resistant cold-rolled steel working roll of a kind of above-mentioned high rigidity, this complete processing comprise teeming, forging molding, the forging postheat treatment carried out successively, remove casting skin, R is repaiied in machining moulding, UT (Ultrasonic Testing), modulation treatment, UT (Ultrasonic Testing), preheating, line-frequency induction quenching, tempering, precision work, UT (Ultrasonic Testing), grinding machine corase grind, precision work, grinding machine corase grind, ultrasonic surface flaw detection, finished product hardness detect size detection and packing warehouse-in.
Wherein preferred embodiment is, described teeming technique first drops into electric furnace with above-mentioned raw materials, and then adopts external refining and esr to carry out refining treatment molten liquid steel, at last by the vacuum argon blowing ingot casting.
Preferred embodiment also has, forge postheat treatment technique and comprise that the workpiece of having no progeny is heated to 650 spends, be incubated and be warming up to 900 degree after 3 hours, then air cooling after being incubated 11 hours, air cooling was put into the stove isothermal 3 hours after spending lower than 250, and then be warming up to 450 degree insulation 3 hours, be warming up to again 650 degree, then be incubated 3 hours, and then be warming up to 720 degree, after being incubated again 14 hours, stop insulation until stove cold less than 350 degree after the air cooling of coming out of the stove.
Preferred embodiment also has, and pre-heating technique comprises: workpiece is put into process furnace be heated to 350 degree, be incubated 2 hours, be warming up to again 450 degree, then be incubated 2 hours, then be warming up to 650 degree, be incubated again 3 hours, then be warming up to 890 degree, then be incubated 6.5 hours, come out of the stove air-cooled to less than 250 degree, reenter stove and be warming up to 350 degree, then be incubated 2 hours, be warming up to again 450 degree, then be incubated 2 hours, then be warming up to 600 degree, be incubated again 8 hours, stop insulation stove in stove and be cooled to less than the air cooling of coming out of the stove after 400 degree.
Preferred embodiment also has, the line-frequency induction quenching technology comprises: first workpiece is put into cabinet-type electric furnace and be heated to 500 degree, then be incubated 6 hours, again work piece hoisting is put in intermediate frequency multi-turn electric heater unit, by adjusting power frequency and the heat-up time of multi-turn electric heater unit, reach and control heat penetration to 70 ~ 100mm, and make body of roll temperature reach 880 spend and be incubated after, enter water-jet and make workpiece cooling fast.
Further preferred embodiment also has, and intermediate frequency multi-turn electric heater unit and water-jet are to be the integrative-structure that distributes 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; should be pointed out that for those skilled in the art, under the prerequisite that does not break away 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 (10)
1. shock-resistant cold-rolled steel working roll of high rigidity, it is characterized in that, described working roll adopts Hi-Stren steel, the chemical composition that contains in described Hi-Stren steel is respectively 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, the S less than or equal to 0.025% and P by weight percentage, and all the other are Fe and the impurity that can not remove.
2. the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 1, is characterized in that, in described chemical composition, the mass ratio of Si and Mn is 1:1 ~ 1:1.15.
3. the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 2, is characterized in that, also contain in described Hi-Stren steel≤oxygen of 15ppm and≤hydrogen of 1.5ppm.
4. complete processing by the shock-resistant cold-rolled steel working roll of the described high rigidity of claim 1, it is characterized in that, described complete processing comprises teeming, forging molding, the forging postheat treatment carried out successively, removes casting skin, R is repaiied in machining moulding, UT (Ultrasonic Testing), modulation treatment, UT (Ultrasonic Testing), preheating, line-frequency induction quenching, tempering, precision work, UT (Ultrasonic Testing), grinding machine corase grind, precision work, grinding machine corase grind, ultrasonic surface flaw detection, finished product hardness detect size detection and packing warehouse-in.
5. the complete processing of the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 4, it is characterized in that, described teeming technique first will be weighed 1 described raw material and drop into electric furnace, and then adopt external refining and esr to carry out refining treatment molten liquid steel, at last by the vacuum argon blowing ingot casting.
6. the complete processing of the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 4, it is characterized in that, described forging postheat treatment technique comprises that the workpiece of having no progeny is heated to 650 spends, be incubated and be warming up to 900 degree after 3 hours, air cooling after being incubated again 10 ~ 12 hours, air cooling was put into the stove isothermal 3 hours after spending lower than 250, and then be warming up to 450 degree insulation 3 hours, be warming up to again 650 degree, be incubated again 3 hours, and then be warming up to 720 degree, then after being incubated 12 ~ 15 hours, stop insulation until the cold air cooling of coming out of the stove after less than 350 degree of stove.
7. the complete processing of the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 4, it is characterized in that, described pre-heating technique comprises: workpiece is put into process furnace be heated to 350 degree, be incubated 2 hours, be warming up to again 450 degree, be incubated again 2 hours, be warming up to again 650 degree, be incubated again 3 hours, be warming up to again 890 degree, be incubated again 6-7 hour, come out of the stove air-cooled to spending less than 250, reenter stove and be warming up to 350 degree, be incubated again 2 hours, be warming up to again 450 degree, be incubated again 2 hours, be warming up to again 600 degree, be incubated again 8 hours, stopping insulation stove in stove is cooled to less than the air cooling of coming out of the stove after 400 degree.
8. the complete processing of the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 4, 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 be incubated 6 hours, again work piece hoisting is put in intermediate frequency multi-turn electric heater unit, by adjusting power frequency and the heat-up time of multi-turn electric heater unit, reach and control heat penetration to 70 ~ 100mm, and make body of roll temperature reach 880 spend and be incubated after, enter water-jet and make workpiece cooling fast.
9. the complete processing of the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 8, is characterized in that, described intermediate frequency multi-turn electric heater unit and water-jet are to be the integrative-structure that distributes up and down.
10. the complete processing of the shock-resistant cold-rolled steel working roll of high rigidity as claimed in claim 4, 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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| 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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| CN103173688B (en) | 2015-06-24 |
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