CN104120342A - Roll and preparation method thereof - Google Patents
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- CN104120342A CN104120342A CN201410395191.6A CN201410395191A CN104120342A CN 104120342 A CN104120342 A CN 104120342A CN 201410395191 A CN201410395191 A CN 201410395191A CN 104120342 A CN104120342 A CN 104120342A
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Abstract
The invention relates to a roll and a preparation method thereof. The roll comprises the following components by weight percent: 0.5-1wt% of carbon, 0.6-1.2wt% of silicon, 0.1-0.6wt% of manganese, not more than 0.02wt% of phosphorus, not more than 0.02wt% of sulfur, 4.5-5.5wt% of cadmium, 0.8-1.4wt% of molybdenum, 0.2-0.8wt% of vanadium and the balance of iron and other impurities. The roll and the preparation method have the beneficial effects that the roll is made from a novel Cr5 section, has the advantages of high strength, high wear resistance and low cost, is used as an intermediate roll of finishing machines and temper mills, and can reduce wear and change of intermediate rolls in actual production; the process of thermal treatment in the process of preparing the roll is further improved; roll blanks with the properties can be prepared according to the preparation method.
Description
Technical field
The present invention relates to a kind of roll and preparation method thereof, particularly relate to a kind of intermediate roll for polishing machine, levelling machine and preparation method thereof.
Background technology
Polishing machine, levelling machine are mainly comprised of shotgun house, support, gate, roll, hydraulic efficiency system and other mechanisms.Wherein, roll is that it is the key of whole milling train for product being rolled to the instrument of processing.The pressure producing while utilizing a pair of or one group of roll rolling rolls stone roller steel, roll is the instrument that workshop is often consumed, its quality directly affects the Quality and yield of steel, so the requirement of the performance of breaker roll (being mainly intensity, wear resistance and certain heat-resistant cracking) is very strict.
In actual applications, in the preparatory process of roll before manufacturing and using, can produce unrelieved stress and thermal stresses.During use, be further subject to again the effect of various cyclic stresses, included bending, torsion, shearing, contact stress and thermal stresses etc.These stress are inhomogeneous, continuous variations along the distribution of the body of roll, and unidirectional axial component is very large, causes abrasion loss very large.So various local damages and the surface damages such as roll, except wearing and tearing, also often occurs crackle, ruptures, peels off, impression.In addition, rolling condition often there will be abnormal conditions, and roll is cooling improper after use, also can be subject to the infringement of thermal stresses.Intermediate roll also often can run into rolling accident in the operation of rolling, so also must there be higher anti-accident performance.In order to ensure the quality of products and to keep the safety in production, need to frequently change intermediate roll, in actual production, increased manufacturing cost.
Roll kind can be divided into casting roll and forging roller by forming method; By processing method, be divided into solid roll, metallurgical composite roll and assembly roller.Casting roll is the roll that smelting molten steel or melting molten steel are manufactured in the mode of direct casting.The roll that wherein carbon content is less than the casting of 2.2% iron is referred to as cast steel roll.Carbon is wherein important alloying element, by being solid-solubilized in the matrix of steel, plays the strengthening effect to steel, and other elements in part carbon and steel form carbide simultaneously, plays the effect of strengthening and increase wear resistance.Chemical composition Cr content can improve the mechanical property of steel and wear resistance, the hardness of increase steel, elasticity, corrosion-resistant and thermotolerance, improves surperficial hardening capacity; But its shortcoming is the toughness that has reduced roll when improving.In addition, when cast steel roll solidifies, owing to there is ingotism, can cause the grain segregation of alloying constituent, along with increasing of alloy cast steel roll alloy content, the segregation index producing while solidifying increases, and causes the degree of irregularity of composition also larger.For the atom of alloying element is fully spread, obtain the uniform austenite of composition, the step that will heat-treat after casting technique.Conventional heat treatment type has: stress relief annealing, the annealing of isothermal ball, diffusion annealing, normalizing, tempering, quenching, sub-zero treatment.The processing parameters such as its temperature of reaction separately, time are the keys that determines roll product quality and performances.
To sum up, need at present a kind of intermediate roll with high strength, high-wearing feature, and the intermediate roll preparation method who improves thermal treatment process.
Summary of the invention
The object of the invention is to, to for cast polishing machine, levelling machine intermediate roll composition improvement and according to the feature of alloy, optimize the heat-treat condition of roll, a kind of roll of novel C r5 material and preparation method of this kind of roll who has improved roll base material intensity, wear resistance is provided.
For achieving the above object, technical scheme provided by the present invention is:
A kind of roll, component by following weight percent forms: carbon: 0.5-1wt%, silicon: 0.6-1.2wt%, manganese: 0.1-0.6wt%, phosphorus :≤0.02wt%, sulphur :≤0.02wt%, cadmium: 4.5-5.5wt%, molybdenum: 0.8-1.4wt%, vanadium: 0.2-0.8wt%, surplus is iron and other impurity.
Further, component by following weight percent forms: carbon: 0.7-0.8wt%, silicon: 0.8-1.0wt%, manganese: 0.2-0.4wt%, phosphorus :≤0.015wt%, sulphur :≤0.015wt%, cadmium: 4.8-5.2wt%, molybdenum: 1.0-1.2wt%, vanadium: 0.4-0.6wt%, surplus is iron and other impurity.
Further, by the component of following weight percent, formed: carbon: 0.75wt%, silicon: 0.9wt%, manganese: 0.3wt%, phosphorus: 0.01wt%, sulphur: 0.01wt%, cadmium: 5wt%, molybdenum: 1.1wt%, vanadium: 0.5wt%, surplus is iron and other impurity.
Further, the weight percent of other impurity is less than or equal to 0.02%, and comprises lead, tin, arsenic, bismuth.
The present invention also provides above-mentioned roll purposes as intermediate roll on polishing machine, levelling machine.
The present invention also provides a kind of preparation method of roll, has following steps:
1) by weight melting in medium-frequency induction furnace that carbon, silicon, manganese, phosphorus, sulphur, cadmium, molybdenum, vanadium and iron are placed in, fully stir, smelting temperature is 500-1000 ℃, and smelting time is 30-40 minute, makes 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 completely cooling, described metal die is removed, formed blank;
4) by described blank forging molding on press;
5) after annealing, carry out UT (Ultrasonic Testing);
6) rough turn processing, UT (Ultrasonic Testing);
7) semi-finishing, UT (Ultrasonic Testing);
8) quench;
9) sub-zero treatment;
10) defrost, tempering;
11) precision work, double tempering, UT (Ultrasonic Testing);
12) detect warehouse-in.
Further, in step 6) afterwards, step 7) semi-finishing before also comprise the step of modifier treatment, holding temperature is 900-950 ℃, soaking time is 5-10 hour.
Further, in the step of modifier treatment, holding temperature is 930 ℃, and soaking time is 10 hours.
The temperature of quenching step 8 wherein further) is 650 ℃; 9) its temperature of the sub-zero treatment described in is-190 to-195 ℃, deep cooling insulation 4-5 hour; Step 10) tempering temperature described in is 100-150 ℃, and the time is 60 hours; Step 11) temperature of double tempering described in is 100-120 ℃, and the time is 120 hours.
Adopt technique scheme, beneficial effect of the present invention has:
1, the invention provides a kind of roll and preparation method thereof, develop the roll of novel C r5 material, met high strength to improving material, high-wearing feature and multiple needs cheaply simultaneously.
2, use new roller of the present invention, in actual production, can improve cold roll work-ing life, reduce enterprise produce in consumptive material cost, reduced the risk that accident occurs.
3,, in the preparation method of roll in the present invention, by optimizing the processing parameter of each link of thermal treatment, that has further improved roll base material moulds hardness, toughness, uniformity and yield strength.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, 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, is not intended to limit the present invention.
Roll disclosed by the invention, component by following weight percent forms: carbon: 0.5-1wt%, silicon: 0.6-1.2wt%, manganese: 0.1-0.6wt%, phosphorus :≤0.02wt%, sulphur :≤0.02wt%, cadmium: 4.5-5.5wt%, molybdenum: 0.8-1.4wt%, vanadium: 0.2-0.8wt%, surplus is iron and other impurity.
Wherein, chemical composition carbon content is the important alloying element in steel, is by being solid-solubilized in the matrix of steel, plays the strengthening effect to steel, and other elements in part carbon and steel form carbide simultaneously, plays the effect of strengthening and increase wear resistance.
Chemical composition cadmium content can improve the mechanical property of steel and wear resistance, the hardness of increase steel, elasticity, corrosion-resistant and thermotolerance, improves surperficial hardening capacity; But its shortcoming is the toughness that has reduced roll when improving.
Chemical composition molybdenum content can make the grain refining of steel, has improved surperficial hardening capacity and thermostrength, at roll, keeps enough intensity and creep resisting abilities during at high temperature, can improve the mechanical property of roll.
Chemical composition nickel content is one of important element in steel, can strengthen hardness, elasticity, ductility and the erosion resistance of steel, and energy crystal grain thinning, improve surperficial hardening capacity, make steel there is high mechanical property, when nickel and cadmium coexist, can greatly improve the physical strength of steel.
Chemical composition content of vanadium can thinning microstructure crystal grain, improves intensity and the toughness of steel, and the carbide that vanadium and carbon form can improve anti-hydrogen-type corrosion ability under High Temperature High Pressure.
Chemical composition silicone content can significantly improve elastic limit, yield-point and the tensile strength of steel.
By experiment repeatedly, obtain the best in quality proportioning of above each component, to reach the best use properties of roll.
embodiment 1
According to weight ratio, be carbon: 0.5wt%, silicon: 1.2wt%, manganese: 0.1wt%, phosphorus: 0.02wt%, sulphur: 0.02wt%, cadmium: 4.5wt%, molybdenum: 0.8wt%, vanadium: 0.2wt%, surplus is iron and other impurity, extraneous copper content is not more than 0.2%, other impurity lead, tin, arsenic, bismuth etc. are all not more than 0.02%, prepares cast material.
Molten alloy solution: by above-mentioned weight ratio, each component is placed in to melting in medium-frequency induction furnace, smelting temperature is 500 ℃, and smelting time is 30 minutes, makes alloy solution.
Detect: adopt spectroscopic analysis to detect the alloy liquid that melting completes, determine that its composition is within scope.
Casting cold cogging: open the hole of coming down in torrents of described power frequency holding furnace, alloy liquid is cast in metal die, after completely cooling, described metal die is removed.
Scrub forging: by pickling, scrub operation, remove remained on surface and oxide compound, forging molding on press.
Annealing, UT (Ultrasonic Testing): after annealing, utilize ultrasonic energy to penetrate the depths of metallic substance, and while 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 afterwards modifier treatment.
Modifier treatment: because induction heating speed is fast, austenite phase transformation temperature raises, the poor increase of carbon concentration in austenite.Steel original structure is thick, contains bulk ferrite when more, and former bulk ferrite position tends to become poor carbon austenitic after austenitizing, and hardness declines.Therefore, before quenching, carry out conditioning heat treatment, can obtain tiny, tissue uniformly, make core of the roll and roll neck reach good mechanical properties, the yield tensile ratio of roll is improved, effectively improve roll fatigue lifetime; For quenching, later stage roller surface does tissue preparation simultaneously, the modified partially carbonized thing disperse educt of roll later, and these carbide, in final hard surfacing, are more prone to dissolve; And can improve matrix, especially the distribution of carbide.Former holding temperature is 860 degree, and existing holding temperature is adjusted into 900 ℃, and soaking time is 10 hours.Former tempering temperature roller surface hardness reaches 45-48HSD, existing same tempering temperature, and surface hardness can reach 49-52HSD, and roll mechanical property increases thereupon relatively.
After modifier treatment, carry out semi-finishing, UT (Ultrasonic Testing): according to processing drawing requirement, on lathe, carry out semi-finishing, utilize ultrasonic energy to penetrate the depths of metallic substance, and while entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.Then quench.
Quench: on quenching machine, by the roll through preheating, in the time of in the induction coil of process energising, because electromagnetic induction forms induced current at roller surface, thereby surface is heated, by thermometric feedback adjustment power regulation Heating temperature, make roller surface obtain certain depth of hardening zone and good uniformity of hardness, by average tempering, roll internal stress is reduced, reduce peeling off in roll use, greatly improved the usability of intermediate roll.Quenching temperature is 650 degree.Then carry out sub-zero treatment.
Sub-zero treatment: this operation is the roll before tempering after quenching to be put into-190 cryostat,s of spending carry out a deep cooling insulation process of 4 hours, increase along with roll interalloy content, by sub-zero treatment, allow part Transformation of Retained Austenite become martensite, so the sub-zero treatment of roll is the continuity of quenching, because cadmium content increase can cause poor toughness, on the content basis of cadmium of the present invention and carbon, the cryogenic temperature of-190 to-195 ℃ can reduce the residual austenite content in roll, reach the wear resistance of roller surface, high rigidity and raising depth of hardening zone, also increased toughness simultaneously, improve the antistripping of roll in later stage use, reduce the risk of fracture of roller.
Then carry out defrost, tempering: tempering at 100 ℃ after defrost, tempering time 60 hours.
Then complete precision work, double tempering, UT (Ultrasonic Testing): double tempering after finish turning processing, 100 ℃ of tempering temperatures, tempering time 120 is hour.Utilize ultrasonic energy to penetrate the depths of metallic substance, and while entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.
The roll of preparing according to above-mentioned production technique, depth of hardening zone reaches 30mm, and body surface hardness value is reaching 98HSD, and hardness uniformity coefficient is less than 2HSD, can be used for polishing machine, the use of levelling machine intermediate roll, and the replacement cycle of roll is increased to 85 kilometers from 50 kilometers.
embodiment 2
According to weight ratio, be carbon: 1wt%, silicon: 0.6wt%, manganese: 0.6wt%, phosphorus: 0.015wt%, sulphur: 0.015wt%, cadmium: 5.5wt%, molybdenum: 1.4wt%, vanadium: 0.8wt%, surplus is iron and other impurity, extraneous copper content is not more than 0.2%, other impurity lead, tin, arsenic, bismuth etc. are all not more than 0.02%, prepares cast material.
Molten alloy solution: by above-mentioned weight ratio, each component is placed in to melting in medium-frequency induction furnace, smelting temperature is 1000 ℃, and smelting time is 40 minutes, makes alloy solution.
Detect: adopt spectroscopic analysis to detect the alloy liquid that melting completes, determine that its composition is within scope.
Casting cold cogging: open the hole of coming down in torrents of described power frequency holding furnace, alloy liquid is cast in metal die, after completely cooling, described metal die is removed.
Scrub forging: by pickling, scrub operation, remove remained on surface and oxide compound, forging molding on press.
Annealing, UT (Ultrasonic Testing): after annealing, utilize ultrasonic energy to penetrate the depths of metallic substance, and while 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 afterwards modifier treatment.
Modifier treatment: holding temperature is adjusted into 960 ℃, soaking time is 5 hours.Former tempering temperature roller surface hardness reaches 45-48HSD, existing same tempering temperature, and surface hardness can reach 49-52HSD, and roll mechanical property increases thereupon relatively.
After modifier treatment, carry out semi-finishing, UT (Ultrasonic Testing): according to processing drawing requirement, on lathe, carry out semi-finishing, utilize ultrasonic energy to penetrate the depths of metallic substance, and while entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.Then quench.
Quench: quenching temperature is 650 degree.
Sub-zero treatment: the cryostat, of the roll before tempering after quenching being put into-195 ℃ carries out deep cooling insulation 5 hours.
Then carry out defrost, tempering: tempering at 150 ℃ after defrost, tempering time 60 hours.
Then complete precision work, double tempering, UT (Ultrasonic Testing): double tempering after finish turning processing, 120 ℃ of tempering temperatures, tempering time 120 is hour.Utilize ultrasonic energy to penetrate the depths of metallic substance, and while entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.
The roll of preparing according to above-mentioned production technique, depth of hardening zone reaches 30mm, and body surface hardness value is reaching 97HSD, and hardness uniformity coefficient is less than 2HSD, can use for polishing machine, levelling machine intermediate roll, and the replacement cycle of roll is increased to 87 kilometers.
embodiment 3
According to weight ratio, be carbon: 0.7wt%, silicon: 1wt%, manganese: 0.2wt%, phosphorus: 0.01wt%, sulphur: 0.01wt%, cadmium: 4.8wt%, molybdenum: 1.0wt%, vanadium: 0.4wt%, surplus is iron and other impurity, extraneous copper content is not more than 0.2%, other impurity lead, tin, arsenic, bismuth etc. are all not more than 0.02%, prepares cast material.
Molten alloy solution: by above-mentioned weight ratio, each component is placed in to melting in medium-frequency induction furnace, smelting temperature is 1000 ℃, and smelting time is 30 minutes, makes alloy solution.
Detect: adopt spectroscopic analysis to detect the alloy liquid that melting completes, determine that its composition is within scope.
Casting cold cogging: open the hole of coming down in torrents of described power frequency holding furnace, alloy liquid is cast in metal die, after completely cooling, described metal die is removed.
Scrub forging: by pickling, scrub operation, remove remained on surface and oxide compound, forging molding on press.
Annealing, UT (Ultrasonic Testing): after annealing, utilize ultrasonic energy to penetrate the depths of metallic substance, and while 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 afterwards modifier treatment.
Modifier treatment: holding temperature is 930 ℃, soaking time is 5 hours.
After modifier treatment, carry out semi-finishing, UT (Ultrasonic Testing): according to processing drawing requirement, on lathe, carry out semi-finishing, utilize ultrasonic energy to penetrate the depths of metallic substance, and while entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.Then quench.
Quench: quenching temperature is 650 degree.Then carry out sub-zero treatment.
Sub-zero treatment: the cryostat, of the roll before tempering after quenching being put into-190 ℃ carries out deep cooling insulation 5 hours.
Then carry out defrost, tempering: tempering at 150 ℃ after defrost, tempering time 60 hours.
Then complete precision work, double tempering, UT (Ultrasonic Testing): double tempering after finish turning processing, 100 ℃ of tempering temperatures, tempering time 120 is hour.Utilize ultrasonic energy to penetrate the depths of metallic substance, and while entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.
The roll of preparing according to above-mentioned production technique, depth of hardening zone reaches 35mm, and body surface hardness value is reaching 98HSD, and hardness uniformity coefficient is less than 2HSD, can use for polishing machine, levelling machine intermediate roll, and the replacement cycle of roll is increased to 85 kilometers.
embodiment 4
According to weight ratio, be carbon: 0.8wt%, silicon: 0.8wt%, manganese: 0.4wt%, phosphorus: 0.01wt%, sulphur: 0.01wt%, cadmium: 5.2wt%, molybdenum: 1.2wt%, vanadium: 0.6wt%, surplus is iron and other impurity, extraneous copper content is not more than 0.2%, other impurity lead, tin, arsenic, bismuth etc. are all not more than 0.02%, prepares cast material.
Molten alloy solution: by above-mentioned weight ratio, each component is placed in to melting in medium-frequency induction furnace, smelting temperature is 1000 ℃, and smelting time is 30 minutes, makes alloy solution.
Detect: adopt spectroscopic analysis to detect the alloy liquid that melting completes, determine that its composition is within scope.
Casting cold cogging: open the hole of coming down in torrents of described power frequency holding furnace, alloy liquid is cast in metal die, after completely cooling, described metal die is removed.
Scrub forging: by pickling, scrub operation, remove remained on surface and oxide compound, forging molding on press.
Annealing, UT (Ultrasonic Testing): after annealing, utilize ultrasonic energy to penetrate the depths of metallic substance, and while 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 afterwards modifier treatment.
Modifier treatment: holding temperature is 930 ℃, soaking time is 4 hours.
After modifier treatment, carry out semi-finishing, UT (Ultrasonic Testing): according to processing drawing requirement, on lathe, carry out semi-finishing, utilize ultrasonic energy to penetrate the depths of metallic substance, and while entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.Then quench.
Quench: quenching temperature is 650 degree.Then carry out sub-zero treatment.
Sub-zero treatment: the cryostat, of the roll before tempering after quenching being put into-195 ℃ carries out deep cooling insulation 5 hours.
Then carry out defrost, tempering: tempering at 100 ℃ after defrost, tempering time 60 hours.
Then complete precision work, double tempering, UT (Ultrasonic Testing): double tempering after finish turning processing, 100 ℃ of tempering temperatures, tempering time 120 is hour.Utilize ultrasonic energy to penetrate the depths of metallic substance, and while entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.
The roll of preparing according to above-mentioned production technique, depth of hardening zone reaches 30mm, and body surface hardness value is reaching 97HSD, and hardness uniformity coefficient is less than 2HSD, can use for polishing machine, levelling machine intermediate roll, and the replacement cycle of roll is increased to 85 kilometers.
embodiment 5
According to weight ratio, be carbon: 0.75wt%, silicon: 0.9wt%, manganese: 0.3wt%, phosphorus: 0.01wt%, sulphur 0.01wt%, cadmium: 5wt%, molybdenum: 1.1wt%, vanadium: 0.5wt%, surplus is iron and other impurity, extraneous copper content is not more than 0.2%, other impurity lead, tin, arsenic, bismuth etc. are all not more than 0.02%, prepares cast material.
Molten alloy solution: by above-mentioned weight ratio, each component is placed in to melting in medium-frequency induction furnace, smelting temperature is 500 ℃, and smelting time is 40 minutes, makes alloy solution.
Detect: adopt spectroscopic analysis to detect the alloy liquid that melting completes, determine that its composition is within scope.
Casting cold cogging: open the hole of coming down in torrents of described power frequency holding furnace, alloy liquid is cast in metal die, after completely cooling, described metal die is removed.
Scrub forging: by pickling, scrub operation, remove remained on surface and oxide compound, forging molding on press.
Annealing, UT (Ultrasonic Testing): after annealing, utilize ultrasonic energy to penetrate the depths of metallic substance, and while 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 afterwards modifier treatment.
Modifier treatment: holding temperature is 930 ℃, soaking time is 5 hours.
After modifier treatment, carry out semi-finishing, UT (Ultrasonic Testing): according to processing drawing requirement, on lathe, carry out semi-finishing, utilize ultrasonic energy to penetrate the depths of metallic substance, and while entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.Then quench.
Quench: quenching temperature is 650 degree.Then carry out sub-zero treatment.
Sub-zero treatment: the cryostat, of the roll before tempering after quenching being put into-195 ℃ carries out deep cooling insulation 5 hours.
Then carry out defrost, tempering: tempering at 100 ℃ after defrost, tempering time 60 hours.
Then complete precision work, double tempering, UT (Ultrasonic Testing): double tempering after finish turning processing, 100 ℃ of tempering temperatures, tempering time 120 is hour.Utilize ultrasonic energy to penetrate the depths of metallic substance, and while entering another cross section by a cross section, the feature that reflection occurs in interface edge check part defect.
The roll of preparing according to above-mentioned production technique, depth of hardening zone reaches 40mm, and body surface hardness value is reaching 98HSD, and hardness uniformity coefficient is less than 2HSD, can use for polishing machine, levelling machine intermediate roll, and the replacement cycle of roll is increased to 85 kilometers.
The above embodiment has only expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore 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 (9)
1. a roll, it is characterized in that, component by following weight percent forms: carbon: 0.5-1wt%, silicon: 0.6-1.2wt%, manganese: 0.1-0.6wt%, phosphorus :≤0.02wt%, sulphur :≤0.02wt%, cadmium: 4.5-5.5wt%, molybdenum: 0.8-1.4wt%, vanadium: 0.2-0.8wt%, surplus is iron and other impurity.
2. roll according to claim 1, it is characterized in that, component by following weight percent forms: carbon: 0.7-0.8wt%, silicon: 0.8-1.0wt%, manganese: 0.2-0.4wt%, phosphorus :≤0.015wt%, sulphur :≤0.015wt%, cadmium: 4.8-5.2wt%, molybdenum: 1.0-1.2wt%, vanadium: 0.4-0.6wt%, surplus is iron and other impurity.
3. roll according to claim 2, it is characterized in that, component by following weight percent forms: carbon: 0.75wt%, silicon: 0.9wt%, manganese: 0.3wt%, phosphorus: 0.01wt%, sulphur: 0.01wt%, cadmium: 5wt%, molybdenum: 1.1wt%, vanadium: 0.5wt%, surplus is iron and other impurity.
4. according to the roll described in any one claim in claim 1-3, it is characterized in that, the weight percent of other impurity is less than or equal to 0.02%, and comprises lead, tin, arsenic, bismuth.
5. according to the purposes as intermediate roll on polishing machine, levelling machine of the roll described in claim 1-4.
6. according to the preparation method of the roll described in claim 1-4, it is characterized in that thering are following steps:
1) by weight carbon, silicon, manganese, phosphorus, sulphur, cadmium, molybdenum, vanadium and iron are placed in to melting in medium-frequency induction furnace, fully stir, smelting temperature is 500-1000 ℃, smelting time is 30-40 minute, makes 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 completely cooling, described metal die is removed, formed blank;
4) by described blank forging molding on press;
5) after annealing, carry out UT (Ultrasonic Testing);
6) rough turn processing, UT (Ultrasonic Testing);
7) semi-finishing, UT (Ultrasonic Testing);
8) quench;
9) sub-zero treatment;
10) defrost, tempering;
11) precision work, double tempering, UT (Ultrasonic Testing);
12) detect warehouse-in.
7. the preparation method of roll according to claim 6, is characterized in that, in step 6) afterwards, step 7) semi-finishing before also comprise the step of modifier treatment, holding temperature is 900-950 ℃, soaking time is 5-10 hour.
8. the preparation method of roll according to claim 7, is characterized in that, in the step of modifier treatment, holding temperature is 930 ℃, and soaking time is 10 hours.
9. the preparation method of roll according to claim 7, is characterized in that, wherein step 8) described in the temperature of quenching be 650 ℃; 9) temperature of the sub-zero treatment described in is-190 to-195 ℃, deep cooling insulation 4-5 hour; Step 10) tempering temperature described in is 100-150 ℃, and the time is 60 hours; Step 11) temperature of double tempering described in is 100-120 ℃, and the time is 120 hours.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109609852A (en) * | 2018-12-29 | 2019-04-12 | 江苏润孚机械轧辊制造有限公司 | A kind of preparation method of planisher, polishing machine working roll |
| CN110791707A (en) * | 2019-10-31 | 2020-02-14 | 宝钢轧辊科技有限责任公司 | High-hardness hot rough rolling working roll for rolling nonferrous metal and manufacturing method thereof |
| WO2020192617A1 (en) * | 2019-03-26 | 2020-10-01 | 江苏润孚机械轧辊制造有限公司 | Method for producing silicon steel cold-rolling work rolls from ordinary forged steel roll blanks |
| CN112030064A (en) * | 2020-08-24 | 2020-12-04 | 宜兴市鑫源辊业有限公司 | High wear-resistant eighteen-roller mill working roller |
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