CN104384193B - The manufacture method of the high-speed steel planishing roll of wire and bar mill - Google Patents
The manufacture method of the high-speed steel planishing roll of wire and bar mill Download PDFInfo
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Abstract
The invention discloses high-speed steel planishing roll and manufacture method, machining and the casting technology field of a kind of wire and bar mill.Including roll neck and constituted the body of roll by working lining, core, a core, the chemical composition of working lining is: 1.50～2.50% C, 0.40～1.00% Si, 0.40～0.80%Mn, P≤0.03%, S≤0.03%, 4.0～8.0%Cr, 0.50～1.00% Ni, 5.00～8.00%Mo, 5.00～8.00%V.Casting process uses high temperature come out of the stove, cast cold mode and fill at a high speed type, the mode of reduction of speed solidification controls pouring temperature and centrifuge speed.The present invention is by alloying component reasonable in design and processing technology, efficiently solve the adaptability at bar line-rolling for the high-speed steel material, improve wearability and the millimeter amount of rolling of roll, and there is good hot-cracking resistance, the operating efficiency of heavy and medium plate mill can be substantially improved.
Description
Technical field
The present invention relates to the manufacture method of a kind of roll, belong to machining and casting technology field.
Background technology
In recent years, China's building, road and bridge industry development are rapid, and wire and rod consumption is substantially improved,
Simultaneously as every engineering is for the lifting of wire and rod quality, each wire and rod rolling level is proposed faster,
More excellent requirement.In order to adapt to the demand in market, bar wire rod rolling mill just progressively to high speed, modernization development,
But unmatched problem also constantly highlights tradition finishing stand roll wearability with the production efficiency of milling train
Coming, steel rolling mill wishes to improve the wearability of roll and anti-accident ability, reduces roller consumption to greatest extent, extends
The roll online cycle.
The body of roll of large-scale roller is made up of the working lining of outer layer and internal core, during domestic production roll one
As first pass through the working lining that centrifugal casting mode casts out outer layer, then at the core within mould assembling cast.Core
General composition cast iron materials and outer layer (working lining) is made up of wear-resisting high alloy material.High speed steel
Matter, with its excellent combination property, becomes the ideal material of bar wire rod rolling mill finishing stand roll, is Bar Wire Product
The developing direction of milling train finishing stand roll material.Current high-speed steel roll is widely applied abroad,
It is not only applicable to cold hot rolled plate, hoop mill, and be applied to bar & high speed wire rolling mill, roughing mill, pipe-mill
Deng.Being restricted by aspects such as rolling condition and steel rolling mill's capacity to reprocess at home, high-speed steel roll is still
Being in the starting stage of development and application, isochrone bar compound high speed steel roll general requirements is less, uses
During conventional centrifugal composite casting, yield rate is relatively low, outer layer (working lining) thickness and global quality control difficulty
Greatly, overseas high speed steel roll typically uses the mode such as jet deposition, high temperature insostatic pressing (HIP) to produce, to a great extent
On improve quality and the yield rate of high-speed steel roll, but by this high-speed steel roll producing its manufacture with
And use cost is very high, therefore develop a kind of cost-effective wire and rod high-speed steel roll thing must
OK.
The centrifugal compound casting of roll is a kind of roll production method based on centrifugal casting, is relative to spray
Penetrate the most economically viable composite roll manufacture method for the preparation methods such as deposition, high temperature insostatic pressing (HIP).High-speed steel
Roll is owing to bearing bigger rolling loads, it is desirable to have high binder course intensity, for guaranteeing bonding layer quality,
Three layers of combined producing tech can be used, i.e. include working lining (high alloy material), the middle close binder of outer layer
(play transition and support the effect combining, also referred to as one time core), core.By controlling the parameter in intermediate layer, carry
High bonding layer quality, but bar wire rod rolling mill high speed steel rider specification is little, and iron water amount is few, designs independent intermediate layer
Composition iron water amount is less, and technological parameter is wayward it is difficult to ensure that bonding layer quality.
The development of current domestic Bar Wire Product high-speed steel roll still belongs to advanced development, and casting technological parameter still belongs to be groped
In the stage, owing to itself fluctuation is relatively big, the qualified casting causing compound high speed steel roll is low, direct shadow
Ring its research and development process.
Content of the invention
The technical issues that need to address of the present invention are to provide the planishing roll of a kind of wire and bar mill high-speed steel material
Manufacture method, to solve tradition, roll in use wearability is inadequate, surface quality difference, easy hot tearing etc.
Technical problem, producing for wire and rod high-speed steel material roll provides a kind of economically viable manufacture method.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
The manufacture method of the high-speed steel planishing roll of a kind of wire and bar mill, described roll includes roll neck and by working
Layer, core, a body of roll for core composition, the alloying component of working lining and the weight percent of each alloying component contain
Amount is C:1.50～2.50%, Si:0.40～1.00%, Mn:0.40～0.80%, P≤0.03%；S≤0.03%,
Cr:4.0～8.0%, Ni:0.50～1.00%, Mo:5.00～8.00%, V:5.00～8.00%, remaining
For Fe and inevitable impurity；The thickness of working lining is 30～60mm, thickness evenness≤10mm；
The manufacture method of described roll, including following technical process:
A) smelt: body of roll working lining is equipped with alloy as raw material with steel scrap, smelts in induction furnace, smelt
Temperature is 1500 DEG C～1600 DEG C；
Core and core material are spheroidal graphite cast-iron, with the pig iron as raw material, smelting temperature is 1460 DEG C～
1500℃；Do not process after coming out of the stove as the molten iron of a core, after coming out of the stove as the molten iron of core, use bag
Inside breeding and spheroidising, inovulant is ferrosilicon, and addition is the 0.4%～0.8% of molten iron total amount, nodulizer
For magnesium-rare earth, addition is the 0.5%～1.3% of molten iron total amount；
B) centrifugal casting: first cast body of roll working lining, the pouring temperature of working lining molten steel is 1400 DEG C～
1500 DEG C, during cast, centrifuge speed is 600～800 revs/min, after body of roll working lining pouring molten steel completes,
Centrifuge speed is adjusted to 450～550 revs/min, until cast exospheric temperature be cooled to liquid-solid phase line with
Upper 10～50 DEG C, then improving centrifuge speed is 600～800 revs/min, and starts cast as once
The untreated molten iron of core；
C) mould assembling cast core and roll neck: the sandbox of the body of roll working lining poured into a mould will be placed and be used for casting rolls
The sandbox of neck merges；By through breeding core molten iron casting with spheroidising in bag to the sand after merging
In case, pouring temperature is 1360 DEG C～1420 DEG C；
D) shake out sand removal:, open sandbox and take out foundry goods after slow cooling 100～150 hours until foundry goods in sandbox,
The molding sand of cleaning cast(ing) surface attachment；
E) conditioning treatment: foundry goods carries out stress relief annealing, and annealing temperature 400 DEG C～600 DEG C, during insulation
Between 120～200 hours, insulation terminate after with stove cooling；Then machining need size and precision；
F) finished heat treatment: use differential quenching method to be heat-treated roller surface, hardening heat
1000 DEG C～1200 DEG C, Quenching Soaking Time 2 hours～10 hours, use spraying or quenching mode
Cooling；Temperature 450 DEG C～550 DEG C, tempering time amounts to 120～170 hours.
Further improvement is that of the manufacture method of the planishing roll of the wire and bar mill of the present invention: smelt working lining
The tapping temperature of Shi Gangshui and difference >=60 DEG C of pouring temperature.
One time core iron hydromining power pack carries out quantitative pouring.
One time core iron water smelts water outlet with core molten iron with stove, and while a core cast, core molten iron is carried out
Breeding in bag and spheroidising, a core solidification carries out core cast when completing.
During cast core, core molten iron uses porous gate spool to inject die cavity, controls core molten iron flow state.
Owing to using technique scheme, have the beneficial effects that produced by the present invention:
The roll using the method for the present invention and material to manufacture, solves tradition roll in use wear-resisting
The technical problems such as property is inadequate, surface quality difference, easy hot tearing.The appropriate design by alloying component for the present invention,
Being successfully prepared the high-speed steel roll being applicable to wire and rod rolling line finishing stand, this roll material possesses high-speed steel
The high alloy characteristic of material, alloy is evenly distributed, and roll working lining performance indications have been effectively ensured；Adopt simultaneously
By novel manufacture method, improve wire and bar mill small dimension high-speed steel roll working lining THICKNESS CONTROL ability,
Making outer layer thickness difference be less than 10mm, working lining is well combined with core, disclosure satisfy that the rolling of wire and rod
Need.
Alloy total content >=15% of the high-speed steel material working lining in the present invention, work is laminated in fabulous ensure that
Gold base, and the alloying element such as C, Mn, Cr, Mo, V can be uniformly distributed, it is ensured that matrix carbonization
The alloy amount dissolved in thing content and matrix so that high-speed steel material overall performance is guaranteed.The present invention
High speed steel matter melting and pouring technology use " high temperature come out of the stove, cast cold " mode, come out of the stove and pour into a mould
The temperature difference controls at >=60 DEG C, it is ensured that smelt stage alloying element can be uniformly distributed, and molten steel is through fully quiet
Put and use cast cold so that impurity fully floats and reduces the degree of superheat raising coagulation efficacy of molten steel.
Ectomesoderm centrifugal casting process centrifuge speed of the present invention control uses " filling at a high speed type, reduction of speed solidifies " mode
Ensure that outer layer high-speed steel quickly fills type and even solidification.In the present invention, a core and core molten iron are with stove water outlet,
Do not carry out rotten and spheroidising directly to pour into a mould, both reached reduction core to outer layer anti-erosion amount, risen simultaneously yet
Arrive the effect in intermediate layer, and intermediate layer has had simple to operate with core with stove smelting, the low advantage of energy consumption.
The mode processing in using core ladle in the present invention so that when a core cast and core molten iron prepare
Between synchronism, improve production efficiency.
The present invention uses porous gate spool when pouring into a mould core molten iron, and porous gate spool possesses filtration, slag stopping function,
The field trash in molten iron can be stopped, effectively prevent the generation of roll binder course slag inclusion accident；Meanwhile, molten iron
Gone out by porous head time-division plume, flowing out phase specific surface tension with overall one and increase so that molten iron stream
To centre polymerization, serving good rectified action, molten iron stream is in stable condition in roll die cavity, to outer layer
Wash away uniformly, skin of the roll thickness evenness is less than 10mm.
Detailed description of the invention
The manufacture method of the high-speed steel planishing roll of wire and bar mill, planishing roll include roll neck and by working lining, one
The body of roll that secondary core, core are constituted, the alloying component of working lining and the weight percentage of each alloying component are C:
1.50～2.50%, Si:0.40～1.00%, Mn:0.40～0.80%, P≤0.03%；S≤0.03%, Cr:
4.0～8.0%, Ni:0.50～1.00%, Mo:5.00～8.00%, V:5.00～8.00%, remaining is Fe
With inevitable impurity；The thickness of working lining is 30～60mm, thickness evenness≤10mm.
The manufacture method of the high-speed steel planishing roll of above-mentioned wire and bar mill includes following technical process:
A) smelt:
Body of roll working lining is equipped with suitable alloy as raw material with high-quality steel scrap, smelts, smelting in induction furnace
Refining temperature is 1500 DEG C～1600 DEG C, is adjusted to the chemical composition of each alloy in above-mentioned scope；
Core and core material are spheroidal graphite cast-iron, with the pig iron as raw material, smelting temperature is 1460 DEG C～
1500℃；Do not process after coming out of the stove as the molten iron of a core, after coming out of the stove as the molten iron of core, use bag
Inside breeding and spheroidising, inovulant is ferrosilicon, and addition is the 0.4%～0.8% of molten iron total amount, nodulizer
For magnesium-rare earth, addition is the 0.5%～1.3% of molten iron total amount；
B) centrifugal casting:
First cast body of roll working lining, the melting of working lining molten steel and pouring technology use " high temperature comes out of the stove, low
Temperature cast " mode, the pouring temperature of working lining molten steel is 1400 DEG C～1500 DEG C, coming out of the stove of working lining molten steel
Temperature should be higher than that pouring temperature more than at least 60 DEG C.During working lining centrifugal casting, use " fill type at a high speed,
The mode of reduction of speed solidification " controls centrifuge speed, to ensure that outer layer high-speed steel quickly fills type and even solidification.
During cast, centrifuge speed is 600～800 revs/min, after body of roll working lining pouring molten steel completes, and will be centrifugal
Machine adjustment of rotational speed is 450～550 revs/min, until the exospheric temperature of cast be cooled to more than liquid-solid phase line 10～
50 DEG C, then improving centrifuge speed is 600～800 revs/min, and starts to pour into a mould not locating as a core
The molten iron of reason；Core iron hydromining power pack carries out quantitative pouring, during a core cast, and centrifuge speed
Can be adjusted according to a core cast situation.
Core molten iron and a core iron water smelt water outlet simultaneously with stove, while a core cast, and core iron
Water synchronization is bred and spheroidising in wrapping, and a core solidification carries out core cast when completing.
C) mould assembling cast core and roll neck:
The sandbox placing the body of roll working lining poured into a mould is merged with the sandbox being used for pouring into a mould roll neck；Will be through
Breeding core molten iron casting with spheroidising in crossing bag in the sandbox after merging, pouring temperature is
1360 DEG C～1420 DEG C, to ensure and the fusion mass of binder course and beneficially inclusion floating；During cast core
Core molten iron uses porous gate spool to inject die cavity, and controls core molten iron flow state.Core during cast core
Portion's molten iron uses porous gate spool to inject die cavity, and porous gate spool possesses filtration, slag stopping function, can stop
Field trash in molten iron, effectively prevents the generation of roll binder course slag inclusion accident；Meanwhile, molten iron is by many
Head time-division plume in hole goes out, and flows out phase specific surface tension with overall one and increases so that molten iron flows to middle poly-
Closing, serving good rectified action, molten iron stream is in stable condition in roll die cavity, washing away all to outer layer
Even.
D) shake out sand removal:, open sandbox and take out foundry goods after slow cooling 100～150 hours until foundry goods in sandbox,
The molding sand of cleaning cast(ing) surface attachment；
E) conditioning treatment: foundry goods carries out stress relief annealing, and annealing temperature 400 DEG C～600 DEG C, during insulation
Between 120～200 hours, insulation terminate after with stove cooling；Then machining need size and precision；
F) finished heat treatment: use differential quenching method to be heat-treated roller surface, hardening heat
1000 DEG C～1200 DEG C, Quenching Soaking Time 2 hours～10 hours, use spraying or quenching mode
Cooling；Temperature 450 DEG C～550 DEG C, tempering time amounts to 120～170 hours.
Only being described in further details the present invention with an embodiment below, those skilled in the art can root
The method and the parameter that are there is provided according to the present embodiment are expanded, and reach other parameter models involved in the present invention
Enclose, be all capable of the purpose of the present invention.
Certain steel rolling mill's finishing stand roll main technical requirements domestic is: specification: Φ 430 × 650 × 1535mm,
Scrap a diameter of Φ 360mm；Working lining thickness >=35mm, working lining hardness: 75～80HSD.
The weight percentage of high-speed steel outer layer (working lining) alloying component and each alloying component is designed as C:
1.50～1.70%, Si:0.70～0.90%, Mn:0.78～0.88%, P≤0.03%；S≤0.03%, Cr:
4.50～4.70%, Ni:0.50～0.70%, Mo:5.90～6.10%, V:6.10～6.30%, remaining is
Fe and inevitable impurity.
In fusion process, body of roll working lining is equipped with suitable alloy as raw material with high-quality steel scrap, in induction furnace
Smelting, smelting temperature is 1550 DEG C；Core of the roll is spheroidal graphite cast-iron, with the pig iron as raw material, smelts temperature
Degree is 1480 DEG C.
Require according to roll technology, it is contemplated that with being combined of intermediate layer, working lining cast thickness is designed as 55mm,
Intermediate layer thickness is 30mm.During cast, set working lining cast centrifugal rotational speed as 600 revs/min, working lining
It is poured rear centrifuge speed and be reduced to 500 revs/min.Working lining pouring temperature is defined as 1450 ± 5 DEG C.
Core pouring temperature is defined as: 1500 ± 5 DEG C, and early stage Quick pouring is after molten iron up to certain altitude, suitably
Reduce poring rate and be beneficial to molten iron feeding.
In casting process, monitor working lining inner wall temperature by temperature instrumentation, according to the working lining detecting
Temperature, arranges coming out of the stove of core molten iron.When being i.e. up to setting temperature by temperature measurer monitoring layer molten steel,
Improving centrifuge speed to 700 revs/min, pouring into a core iron water, pouring temperature is 1510 ± 5 DEG C, cast
Process is carried out quantitative pouring by power pack.
Pouring into a mould after a core finishes, the remaining molten iron simultaneously come out of the stove breeds and spheroidising in wrapping, pregnant
Educating agent is ferrosilicon, and addition is 0.4%～0.8%, and nodulizer is magnesium-rare earth, and addition is 1%～1.3%.
Monitor a core temperature by temperature measurer, body of roll sandbox will have been poured into a mould and be used for when temperature reaches freezing point
The sandbox of cast roll neck carries out mould assembling, and the good porous gate spool of frame pours into a mould core molten iron.
Stokehold sampling detection chemical composition, the chemical composition of working lining is after testing: C 1.51%, Si 0.73%,
Mn 0.80%, P 0.01%, S 0.005%, Cr 4.55%, Ni 0.61%, Mo 6.01%, V 6.20%,
Remaining is Fe and inevitable impurity.
After roll polishing sand removal, foundry goods being carried out stress relief annealing, annealing temperature 550 DEG C, temperature retention time 180 is little
When, insulation cools down with stove after terminating；Then machining need size and precision.Roll finally uses difference
Roller surface is heat-treated by temperature process for quenching, hardening heat 1100 DEG C, Quenching Soaking Time 3 hours,
Quenching mode is used to cool down；Use multistage tempering, temperature be respectively 525 DEG C, 525 DEG C and
550 DEG C, tempering time amounts to 130 hours.Roll is thermally treated and after processed finished products, detection hardness of roll body is
77～79HSD, flaw detection working lining thickness is 42～48mm, ultrasonic examination binder course wave height 10～20%.
Linear wearing capacity under same experimental conditions for the roll of the present invention than high-ni-cr roll reduce by 75%, than pin ball from
Heart roll reduces by 60%, and steel transportation amount is 2～3 times of high-ni-cr roll and pin ball centrifugal roller.
Claims (5)
1. a manufacture method for the high-speed steel planishing roll of wire and bar mill, described roll includes roll neck and by work
Make layer, core, a body of roll for core composition, it is characterised in that: the alloying component of working lining and each alloy become
The weight percentage dividing is C:1.50～2.50%, Si:0.40～1.00%, Mn:0.40～0.80%,
P≤0.03%；S≤0.03%, Cr:4.0～8.0%, Ni:0.50～1.00%, Mo:5.00～8.00%,
V:5.00～8.00%, remaining is Fe and inevitable impurity；The thickness of working lining is 30～60mm,
Thickness evenness≤10mm；
The manufacture method of described roll includes following technical process:
A) smelt: body of roll working lining is equipped with alloy as raw material with steel scrap, smelts in induction furnace, smelt
Temperature is 1500 DEG C～1600 DEG C；
Core and core material are spheroidal graphite cast-iron, with the pig iron as raw material, smelting temperature is 1460 DEG C～
1500℃；Do not process after coming out of the stove as the molten iron of a core, after coming out of the stove as the molten iron of core, use bag
Inside breeding and spheroidising, inovulant is ferrosilicon, and addition is the 0.4%～0.8% of molten iron total amount, nodulizer
For magnesium-rare earth, addition is the 0.5%～1.3% of molten iron total amount；
B) centrifugal casting: first cast body of roll working lining, the pouring temperature of working lining molten steel is 1400 DEG C～
1500 DEG C, during cast, centrifuge speed is 600～800 revs/min, after body of roll working lining pouring molten steel completes,
Centrifuge speed is adjusted to 450～550 revs/min, until cast exospheric temperature be cooled to liquid-solid phase line with
Upper 10～50 DEG C, then improving centrifuge speed is 600～800 revs/min, and starts cast as once
The untreated molten iron of core；
C) mould assembling cast core and roll neck: the sandbox of the body of roll working lining poured into a mould will be placed and be used for casting rolls
The sandbox of neck merges；By through breeding core molten iron casting with spheroidising in bag to the sand after merging
In case, pouring temperature is 1360 DEG C～1420 DEG C；
D) shake out sand removal:, open sandbox and take out foundry goods after slow cooling 100～150 hours until foundry goods in sandbox,
The molding sand of cleaning cast(ing) surface attachment；
E) conditioning treatment: foundry goods carries out stress relief annealing, and annealing temperature 400 DEG C～600 DEG C, during insulation
Between 120～200 hours, insulation terminate after with stove cooling；Then machining need size and precision；
F) finished heat treatment: use differential quenching method to be heat-treated roller surface, hardening heat
1000 DEG C～1200 DEG C, Quenching Soaking Time 2 hours～10 hours, use spraying or quenching mode
Cooling；Temperature 450 DEG C～550 DEG C, tempering time amounts to 120～170 hours.
2. the manufacture method of the high-speed steel planishing roll of wire and bar mill according to claim 1, its feature
It is: difference >=60 DEG C of tapping temperature and the pouring temperature of molten steel when smelting working lining.
3. the manufacture method of the high-speed steel planishing roll of wire and bar mill according to claim 1, its feature
It is: one time core iron hydromining power pack carries out quantitative pouring.
4. the manufacture method of the high-speed steel planishing roll of wire and bar mill according to claim 3, its feature
It is: one time core iron water smelts water outlet with core molten iron with stove, and while a core cast, core molten iron enters
Breeding and spheroidising in row bag, a core solidification carries out core cast when completing.
5. the manufacture method of the high-speed steel planishing roll of wire and bar mill according to claim 1, its feature
It is: during cast core, core molten iron uses porous gate spool to inject die cavity, controls core molten iron flow state.
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| CN1064566C (en) * | 1997-02-24 | 2001-04-18 | 冶金工业部钢铁研究总院 | Centrifugal casting method for producing composite high-speed steel rollers |
| JP4387854B2 (en) * | 2004-03-31 | 2009-12-24 | 虹技株式会社 | Roll material for rolling and roll for rolling |
| CN100552075C (en) * | 2008-01-30 | 2009-10-21 | 中国科学院金属研究所 | A high-speed steel composite roll and its casting method |
| CN101956145B (en) * | 2010-09-26 | 2012-11-28 | 中钢集团邢台机械轧辊有限公司 | Semi high speed steel cold-rolling intermediate roll and manufacturing method thereof |
| CN101954378B (en) * | 2010-09-26 | 2012-08-08 | 中钢集团邢台机械轧辊有限公司 | Working roll for rolling medium-thickness plate with high grade and high strength and manufacture method thereof |
| CN103409688B (en) * | 2013-07-10 | 2015-07-15 | 中钢集团邢台机械轧辊有限公司 | Large forged high-speed steel cold roll and manufacturing method thereof |
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| CN104384193A (en) | 2015-03-04 |
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