CN103302457A - Rod and wire and manufacturing technology of working roll used for hot strip mill - Google Patents
Rod and wire and manufacturing technology of working roll used for hot strip mill Download PDFInfo
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- CN103302457A CN103302457A CN2013102426038A CN201310242603A CN103302457A CN 103302457 A CN103302457 A CN 103302457A CN 2013102426038 A CN2013102426038 A CN 2013102426038A CN 201310242603 A CN201310242603 A CN 201310242603A CN 103302457 A CN103302457 A CN 103302457A
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Abstract
The invention discloses a rod and wire and a manufacturing technology of a working roll used for a hot strip mill. The technology comprises the steps as follows: a high alloy material is smelt through an intermediate frequency furnace to obtain working-layer liquid iron; then a special method which combines centrifugal compounding with washing of low alloy ductile cast iron liquid iron is used for casting to form a centrifugal compound roll blank; afterwards, the blank roll is processed by procedures as follows: rough machining until the heat treatment condition is met, high-temperature heating, austenitizing, quenching, tempering, semi-finish-turning machining, finish turning machining and the like, and the blank roll is ground to be a finished product; and finally, a hole pattern is subjected to notching treatment according to requirements of the rolling mill. According to the invention, the roll is produced by adopting the high alloy working-layer material and a unique centrifugal and top pouring type half-washing casting technology, the problems that the metallographic structure is poor and the performance index cannot meet requirements due to high alloy content of a core part of the minor-diameter centrifugal composite roll produced with a conventional method are solved, severe accidents such as roll breakage and the like, which are prone to occur during using of steel rolling are eliminated, and the service life of the roll is prolonged.
Description
Technical field
The present invention relates to a kind of excellent wire rod and narrow strip rolling mill working roll production method, especially a kind of high-alloy centrifugal composite roll special producing technology.
Background technology
Fast development along with China's steel rolling industry, have higher requirement for the roll use that mainly consumes one of spare part as milling train, for improving the service life of roll, reduce the steel rolling cost, the material of roll is improved also extremely urgent, particularly bar wire rod rolling mill and narrow strip rolling mill, carrying out high alloy working lining roll has been the task of top priority, and because bar wire rod rolling mill and the used roll general requirements of strip mill are less, form a large amount of alloys at core easily when adopting conventional centrifugal complex method to produce high alloy material working lining roll, cause core carbide amount excessive, intensity is on the low side, and serious accidents such as roll breakage take place when steel rolling easily.The core alloy content of technology making at present is more than 0.7%, and carbide content is more than 8%.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of excellent wire rod and hot strip rolling mill working roll production technology, to solve the core alloy content height that high alloy working lining roll that the centrifugal complex method of present employing produces is prone to, the problem that the carbide amount is excessive improves its intensity and toughness.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of excellent wire rod and hot strip rolling mill working roll production technology comprise following processing step: a, adopt high alloy material through intermediate frequency furnace melting working lining molten iron; B, adopt the low-alloy spheroidal graphite cast-iron material through intermediate frequency furnace melting core molten iron c, carry out centrifugal casting working lining molten iron; The teeming formula adds half flushing cast core molten iron and forms the composite roll blank after d, the mould assembling, by flushing replacing section core molten iron, guarantees that core alloy content satisfies performance requirement; E, the blank roll is carried out the corresponding manufacturing procedure that changes over to after the assay was approved; F, stroke bottom center hole line bore the bottom center hole; G, top bottom centre bore, folder emit the end roll neck to carry out rough turn processing; H, pair roller neck position utilize heat-barrier material to wrap up protection; I, will put into the high-temperature heat treatment resistance furnace through the roll of step I and heat by technological requirement, and make body of roll position reach the technological requirement hardening heat and be incubated; J, will hang out resistance furnace through the roll of step j, it is on-the-spot to be placed on cooling, carries out the control rate cooling; K, roll cool off the commentaries on classics resistance furnace that finishes and carry out temper; L, tempering finish back commentaries on classics manufacturing procedure, the hole of reconditioning bottom center again; M, top bottom centre bore, folder emit the end roll neck to carry out finish turning processing; The homalocephalus plane is washed in n, line and processing keyway, boring, processes fillet everywhere; O, correct grinding body of roll roll neck are to finished product; P, product inspection.
For improving the service life of roll, the chemical composition of high alloy material of the present invention and low-alloy spheroidal graphite cast-iron is respectively:
Centrifugal casting working lining molten iron adopts horizontal centrifuge among the step c of the present invention, and gravitation multiple is selected more than 80.
For avoiding crackle taking place when the roll heat treatment and formulate the rational heat treatment technological parameter, between step g, h, carry out body of roll roll neck position metallographic and carrying out flaw detection, change heat treatment step over to after qualified.
Too high for guaranteeing roll neck temperature temperature when heating, influence performance, the heat-barrier material among the described step h generally is adopted as ceramic fibre, and wrapping thickness is 30-50mm.
For guaranteeing the austenitizing degree of roll, heating-up temperature is generally between 1000-1200 ℃ in the described step I.
Hardness is defective to be caused uselessly because organizing after being machined to finished product in order to avoid roll, carries out the body of roll, roll neck metallographic and hardness and detect between described step k, l, and manufacturing procedure is changeed in qualified back, once success.
Half flushing in the described steps d is specially: after the teeming formula has been watered the core molten iron, continue to increase cast core iron water amount, the core molten iron flushing of die cavity displaces a part with watering for the first time into, overflowed by overflow pipe, concrete flushing displacement iron water amount is different and different with working lining thickness and alloy content according to product specification.
The beneficial effect that adopts technique scheme to produce is: adopt unique centrifugal compound teeming formula that adds partly to wash excellent wire rod and the strip mill roll that pouring procedure is made, solve conventional method and produced the higher difficult problem of minor diameter high alloy working lining core of the roll alloy, improve the working lining life-span more than 3 times in, stopped to cause because core alloy content is higher at the machine roll breakage accident.Because: the minor diameter high-alloy centrifugal composite roll that adopts conventional teeming formula cast core molten iron method to produce, for guaranteeing the wearability of roll, the working lining alloy content is often higher, and when carrying out the core cast, for guaranteeing working lining and the fine fusion of core, need corrosion part working lining molten iron to enter core, can cause core alloy content higher like this, thereby cause in the core tissue carbide content too high, directly cause core plasticity and toughness to reduce, intensity reduces; And adopt the teeming formula to add half backwashing manner cast core molten iron, behind teeming formula cast core molten iron, the core molten iron that carries out half flushing cast again can cement out a part with the heavy alloyed core molten iron that contains of teeming formula cast, reduce core molten iron alloy content, thereby reduce the carbide content in the core tissue, improve plasticity, toughness and the intensity of core, when improving roll working lining wearability, avoid roll in rolling process, to hang down serious accidents such as roll breakage takes place because of core intensity.
Description of drawings
Fig. 1 is working lining centrifugal casting schematic diagram of the present invention;
Fig. 2 is that teeming formula of the present invention adds half flushing cast and fills out the core schematic diagram;
Wherein, 1, depositing funnel; 2, outer molten iron; 3, cold mould; 4, horizontal centrifuge; 5, fill out the core funnel; 6, rising head case; 7, end cap case; 8, working lining; 9, end cap case; 10, centre circle; 11, under casing; 12, overflow pipe; 13, core molten iron.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
Embodiment 1: domestic certain the bar mill roller with production φ 370 * 600 * 1710 is example, specifies the technical process that production high-alloy centrifugal compound bar wire rod and strip mill are used working roll.
Used working lining high alloy material is the high-speed steel material, and core material is selected low-alloy spheroidal graphite cast-iron for use, and these materials can satisfy produces the requirement of centrifugal compound high alloy roller performance.Composition (be weight percentage, surplus is iron) as shown in table 1 below:
Table 1
The concrete processing step of centrifugal composite high-speed steel roller is as follows: a, employing high speed steel material are through intermediate frequency furnace melting working lining molten iron; B, the common low-alloy spheroidal graphite cast-iron material of employing are through intermediate frequency furnace melting core molten iron; C, carry out centrifugal casting working lining molten iron, referring to accompanying drawing 1; The teeming formula pours into the core iron water amount of requirement after d, the mould assembling, continues to add an amount of core molten iron and washes replacing section core molten iron, and final cast forms the composite roll blank, referring to accompanying drawing 2; E, the blank roll is carried out the metallographic structure preliminary test, change manufacturing procedure over to after qualified; F, stroke bottom center hole line bore the bottom center hole; G, top bottom centre bore, folder emit the end roll neck to carry out the rough turn barrel diameter φ 382mm that is machined to; H, the thick ceramic fibre of pair roller neck position wrapping 40mm; I, roll is put into the high-temperature heat treatment resistance furnace be heated to 1000-1150 ℃ of insulation; J, insulation finish the back roll and hang out resistance furnace, are placed on the cooling scene, control cooling; K, roll cool off the commentaries on classics resistance furnace that finishes and carry out temper; L, tempering finish back commentaries on classics manufacturing procedure, the hole of reconditioning bottom center again; M, top bottom centre bore, folder emit the end roll neck to carry out finish turning and be machined to φ 371mm; The homalocephalus plane is washed in n, line and processing keyway, boring, processes fillet everywhere; O, correct grinding body of roll roll neck are that the body of roll is of a size of φ 370 * 600 to finished product; P, product inspection hardness of roll body are 80-85HSD, roll neck hardness is 40-45HSD, it is 0.51% that process detects its core alloy total amount, carbonized thing content is 4.2%, satisfy customer requirements and on the user machine normally use, respond well, the rough estimates amount of rolling has reached 3.0 times of common high-ni-cr rolls.
Embodiment 2: domestic certain the high-speed wire mill roller with production φ 340 * 600 * 1465 is example, specifies the technical process that production high-alloy centrifugal compound bar wire rod and strip mill are used working roll.
The used working lining high alloy material of this roller is similarly the high-speed steel material, and because of milling train condition work difference, composition and last one slightly have any different, and core material is selected low-alloy spheroidal graphite cast-iron for use, and the roll of these manufacture of materials can satisfy customer requirements equally.Composition (be weight percentage, surplus is iron) as shown in table 2 below:
Table 2
The concrete processing step of centrifugal compound high alloy roll is as follows: a, employing high speed steel material are through intermediate frequency furnace melting working lining molten iron; B, the common low-alloy spheroidal graphite cast-iron material of employing are through intermediate frequency furnace melting core molten iron; C, carry out centrifugal casting working lining molten iron; The teeming formula pours into the core iron water amount of requirement after d, the mould assembling, continues to add an amount of core molten iron and washes replacing section core molten iron, and final cast forms the composite roll blank; E, the blank roll is carried out the metallographic structure preliminary test, change manufacturing procedure over to after qualified; F, stroke bottom center hole line bore the bottom center hole; G, top bottom centre bore, folder emit the end roll neck to carry out the rough turn barrel diameter φ 352mm that is machined to; H, the thick ceramic fibre of pair roller neck position wrapping 30mm; I, roll is put into the high-temperature heat treatment resistance furnace be heated to 1050-1200 ℃ of insulation; J, insulation finish the back roll and hang out resistance furnace, are placed on the cooling scene, carry out the air-cooled air cooling control rate cooling that adds; K, roll cool off the commentaries on classics resistance furnace that finishes and carry out temper; L, tempering finish back commentaries on classics manufacturing procedure, the hole of reconditioning bottom center again; M, top bottom centre bore, folder emit the end roll neck to carry out finish turning and be machined to φ 341mm; The homalocephalus plane is washed in n, line and processing keyway, boring, processes fillet everywhere; O, correct grinding body of roll roll neck are that the body of roll is of a size of φ 340 * 600 to finished product; P, product inspection hardness of roll body are 83-87HSD, and roll neck hardness is 35-40HSD, and its core alloy total amount is 0.53%(weight after testing), carbonized thing content is 4.5%(weight).Satisfy customer requirements.At present this roller on the user machine normally on probation, the rough estimates amount of rolling has also reached more than 3 times of common alloy ductile iron.
We prove through a large amount of pilot productions: for bar wire rod rolling mill and strip mill small diameter roller, when working lining is the high alloy material, roll by the centrifugal complex method production of the present invention, its core alloy total amount is not more than 0.6%, carbonized thing content is less than 5%, both guaranteed the service life of working lining, and can guarantee that again core intensity satisfied the milling train demand.Adopt this technology, the content of strong carbide alloys such as major control core chromium, molybdenum.
The present invention adopts high alloy working layer and unique centrifugal teeming formula that adds partly to wash the roll that pouring technology is produced, the metallographic structure of having avoided conventional method production minor diameter centrifugal compound roll core structure alloy content height to cause is poor, performance indications do not reach and require phenomenon, stopped when steel rolling is used, to take place easily the phenomenon of abominable accidents such as roll breakage, the service life of having improved roll.The effective working lining thickness of making of high alloy roll surpasses 30mm, hardness of roll body reaches more than the 80HSD, and roll neck hardness can be controlled below 45HSD, satisfies the instructions for use of excellent wire rod and strip mill fully, and improve 3 times or more than common high-ni-cr roll service life.
Wherein, the cast working lining is referring to accompanying drawing 1 in above-described embodiment, and cold mould 3 is at a high speed rotation on horizontal centrifuge 4, and molten iron pours into cold mould 3 die cavities by depositing funnel 1, solidify certain hour after, sling and carry out mould assembling cast core molten iron.
Referring to accompanying drawing 2, this figure is core cast schematic diagram after the mould assembling, and the core molten iron pours into die cavity by filling out core funnel 5, opens overflow pipe 12 behind the casting complete, continues to pour into the core molten iron, and overflows partial molten iron to reduce core alloy content by overflow pipe 12.
Claims (8)
1. an excellent wire rod and hot strip rolling mill working roll production technology is characterized in that: undertaken by following step:
A, adopt high alloy material through the working lining molten iron of intermediate frequency furnace melting working roll;
B, adopt the low-alloy spheroidal graphite cast-iron material through the core molten iron of intermediate frequency furnace melting working roll;
C, carry out centrifugal casting working lining molten iron;
Adopt the teeming formula to add half flushing cast core molten iron after d, the mould assembling and form the composite roll blank;
E, above-mentioned blank roll is carried out corresponding check, change manufacturing procedure over to after qualified;
F, stroke bottom center hole line bore the bottom center hole;
G, top bottom centre bore, folder emit the end roll neck to carry out rough turn processing;
H, pair roller neck position utilize heat-barrier material to wrap up protection;
I, will put into the high-temperature heat treatment resistance furnace through the roll of step I and heat by technological requirement, austenitizing makes body of roll position reach the technological requirement hardening heat and is incubated;
J, will hang out resistance furnace through the roll of step j, it is on-the-spot to be placed on cooling, and control rate cools off;
K, roll cool off the commentaries on classics resistance furnace that finishes and carry out temper, and temperature is 450-580 ℃;
L, tempering finish back commentaries on classics manufacturing procedure, the hole of reconditioning bottom center again;
M, top bottom centre bore, folder emit the end roll neck to carry out finish turning processing;
The homalocephalus plane is washed in n, line and processing keyway, boring, processes fillet everywhere;
O, correct grinding body of roll roll neck are to finished product;
P, product inspection.
2. a kind of excellent wire rod according to claim 1 and hot strip rolling mill working roll production technology, it is characterized in that: the chemical composition of described high alloy material and low-alloy spheroidal graphite cast-iron is respectively (weight percentage), and surplus is iron:
3. a kind of excellent wire rod according to claim 1 and hot strip rolling mill working roll production technology is characterized in that: centrifugal casting working lining molten iron adopts horizontal centrifuge among the described step c, and gravitation multiple is selected more than 80.
4. a kind of excellent wire rod according to claim 1 and hot strip rolling mill working roll production technology, it is characterized in that: half flushing in the described steps d is specially: after the teeming formula has been watered the core molten iron, continue to increase cast core iron water amount, the core molten iron flushing of die cavity displaces a part with watering for the first time into, is overflowed by overflow pipe.
5. a kind of excellent wire rod according to claim 1 and hot strip rolling mill working roll production technology is characterized in that: carry out the body of roll, roll neck position metallographic and carrying out flaw detection between described step g, h, change heat treatment step over to after qualified.
6. a kind of excellent wire rod according to claim 1 and hot strip rolling mill working roll production technology is characterized in that: the heat-barrier material among the described step h adopts ceramic fibre, and wrapping thickness is 40～50mm.
7. a kind of excellent wire rod according to claim 1 and hot strip rolling mill working roll production technology, it is characterized in that: heating-up temperature is between 1000-1200 ℃ in the described step I.
8. a kind of excellent wire rod according to claim 1 and hot strip rolling mill working roll production technology is characterized in that: carry out the body of roll, roll neck metallographic and hardness and detect between described step k, l.
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Cited By (6)
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| CN104525889A (en) * | 2014-12-31 | 2015-04-22 | 中钢集团邢台机械轧辊有限公司 | High-speed steel roller manufacturing method |
| CN106702114A (en) * | 2016-12-29 | 2017-05-24 | 大连冶金工具厂有限公司 | Production process of alloy cast steel roller |
| CN107377892A (en) * | 2017-06-22 | 2017-11-24 | 成都三强轧辊股份有限公司 | A kind of cast steel roll casting device and casting technique |
| CN112264465A (en) * | 2020-09-29 | 2021-01-26 | 武汉钢铁有限公司 | Centrifugal composite roller |
| CN114351032A (en) * | 2021-12-21 | 2022-04-15 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-material vertical roll |
| CN114952184A (en) * | 2022-04-15 | 2022-08-30 | 辽宁恒通冶金装备制造有限公司 | Preparation process of hot-rolled working roll |
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| CN114351032B (en) * | 2021-12-21 | 2023-12-12 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-material vertical roll |
| CN114952184A (en) * | 2022-04-15 | 2022-08-30 | 辽宁恒通冶金装备制造有限公司 | Preparation process of hot-rolled working roll |
| CN114952184B (en) * | 2022-04-15 | 2024-03-29 | 辽宁恒通冶金装备制造有限公司 | Hot rolling working roll preparation process |
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Effective date of registration: 20180408 Address after: 054800 Pujiang street, Qinghe County, Xingtai, Hebei Province, No. 118 Patentee after: Xingtai hung Ke high speed steel roll Co., Ltd. Address before: 054000 unit 3, building No. 202 of Renhe home, Qiaoxi District, Xingtai, Hebei Patentee before: Qin Yingfang |
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