CN103316910A - Cr12MoV flat steel rolling method - Google Patents

Cr12MoV flat steel rolling method Download PDF

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Publication number
CN103316910A
CN103316910A CN2012100753064A CN201210075306A CN103316910A CN 103316910 A CN103316910 A CN 103316910A CN 2012100753064 A CN2012100753064 A CN 2012100753064A CN 201210075306 A CN201210075306 A CN 201210075306A CN 103316910 A CN103316910 A CN 103316910A
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China
Prior art keywords
cr12mov
ingot casting
heating
band steel
fiery
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Pending
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CN2012100753064A
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Chinese (zh)
Inventor
顾新根
刘全
朱平
刘凯
张培德
薄伟兵
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Baosteel Special Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Priority to CN2012100753064A priority Critical patent/CN103316910A/en
Publication of CN103316910A publication Critical patent/CN103316910A/en
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Abstract

The invention discloses a Cr12MoV flat steel rolling method. The method adopts the following thermal treatment process technologies, such as hot charging of more than 2 tons of cast ingots, hot charging and heating, as well as homogenization treatment of cast ingots in soaking pit, secondary fire rolling via a blooming mill and annealing treatment, to solve the technical problem that conventional cool working die steel cast ingots can not be directly rolled to produce flat steel. The Cr12MoV flat steel rolling method can roll qualified cool working die steel Cr12MoV flat steel with the width of about 400 mm, and lowers energy consumption and metallurgical manufacturing cost to a greater extent, thereby meeting product demands of the market.

Description

A kind of milling method of Cr12MoV band steel
Technical field
The present invention relates to the production technology of Cr12MoV band steel, more particularly, relate to a kind of milling method of Cr12MoV band steel.
Background technology
Mould steel is special steel alloy, divides by purposes, generally can be divided into hot die steel and cold work die steel two large classes.Come minute by material shape, generally can be divided into three kinds of square steel, round steel, band steel.
Cr12MoV is cold work die steel, and this steel can bear heavier load, and has high wearability, is widely used in making the materials such as cold-punching mould, cold heading die, cold extruding die, wire drawing die.
Its as-cast structure of Cr12MoV is ledeburite, has quite high carbon content (C:1.45~1.70%) and alloying element (Cr:11.00~12.50%, Mo:0.40~0.60%, V:0.15~0.30%).Its intrinsic characteristic is: as cast condition thermoplasticity poor, overheated responsive (heating-up temperature>1190 ℃, strength degree sharply descends); Non-uniform temperature or deformation temperature are lower than 1000 ℃, and plasticity significantly descends, and are easy to produce severe crack.
At present, the band steel production of cold work die steel Cr12MoV has been the band steel of ingot casting forging and pressing how fiery cogging+rolling production width≤300mm of becoming a useful person since the longer-term; Width reaches the band steel production of the cold work die steel of 400mm, and ingot casting has the how fiery forging of dependence forging and pressing only and finishes.Become a useful person cold work die steel band steel or ingot casting of the how fiery cogging of above-mentioned ingot casting forging and pressing+rolling forges and presses the become a useful person shortcoming of traditional processing technology of cold work die steel band steel of how fiery forging and be: production capacity is low, and the energy resource consumption of manufacture process is high, and manufacturing cost is high.
Summary of the invention
For the above-mentioned shortcoming that exists in the prior art, the purpose of this invention is to provide a kind of milling method of Cr12MoV band steel, can Direct Rolling produce width and reach Cr12MoV band steel about 400mm.
For achieving the above object, the present invention adopts following technical scheme:
The milling method of this Cr12MoV band steel comprises the steps:
A. heat is sent the Cr12MoV ingot casting, and the charging temperature of described ingot casting is at 600~800 ℃;
B. adopt soaking pit to carry out the heating of hot charging ingot casting, melt down and heat the processing that homogenizes by the first fiery ingot casting heating, the second fiery rolled piece respectively;
C. after the heating of the first fiery ingot casting and the second fiery rolled piece melt down heating, carry out respectively corresponding rolling;
D. hot rolling Cr12MoV band steel is carried out the hot charging annealing in process.
In steps A, choose ingot casting weight>2t, the ingot casting sectional dimension: the heavy in section is 500 * 500mm 2, small bore is 430 * 430mm 2, the ingot casting of the high 1300mm of ingot casting.
In step B, the step of the described first fiery ingot casting heating is:
B1. the charging temperature of controlling ingot casting is 600~800 ℃, and is incubated 100~150 minutes;
B2. the speed heating with 70~100 ℃/h makes ingot casting be warming up to 1100~1200 ℃;
B3. 1100~1200 ℃ of lower insulations 2 hours~5 hours.
In step B, the step that the described second fiery rolled piece melts down heating is:
B4. rolled piece is heated to 1050~1200 ℃, and is incubated 2~3 hours.
Melt down between the soak of heating in the heating of the described first fiery ingot casting and the second fiery rolled piece, will melt down by an ingot casting or rolled piece and stand up, reducing its male and female face temperature difference, and control male and female face temperature difference<50 ℃.
In step C, it is as follows that rolling after the heating of the described first fiery ingot casting requires:
C1. roll is preheated to 100~250 ℃ of temperature, and the start rolling temperature 1100-1700 of ingot casting ℃, finishing temperature>900 ℃;
C2. the roll biting speed is 10~40 rev/mins, each drafts 10~25mm;
C3. rolled piece melts down heating.
In step C, the described second fiery rolled piece melts down rolling after the heating and requires as follows:
C4. roll is preheated to 100~250 ℃ of temperature, and the start rolling temperature 1100-1700 of rolled piece ℃, finishing temperature>900 ℃;
C5. the roll biting speed is 10~40 rev/mins, and rolled piece is nipped rear mill speed 40-80 rev/min, each drafts 20~40mm;
C6. rolled piece melts down heating.
In step D, the concrete steps of described annealing in process are as follows:
D1. control annealing furnace parallels spacing≤800mm, the difference in height≤3mm between every block of parallels;
D2. the Cr12MoV band steel block-by-block longitudinal overlap after rolling is collected, winch to the annealing furnace chassis;
D3. the speed with≤70~100 ℃/h be warming up to≤870 ℃;
D4. after heating up,<870 ℃ of lower insulations 10~20 hours;
D5. after insulation finished, with the speed cooling of≤50 ℃/h, temperature was down to≤200 ℃ come out of the stove.
In step D5, the band steel specification after coming out of the stove is 80~100 * 300~400mm.
In technique scheme, the milling method of Cr12MoV band steel of the present invention adopt greater than 2 tons ingot casting heat give, the heat processing technique technology such as the fiery rolling and annealing in process of the heating of soaking pit hot charging ingot casting and processings that homogenize, blooming mill two, solved the technical problem that cold work die steel ingot casting Cr12MoV in the past can not Direct Rolling produces band steel, can roll out qualified width and reach cold work die steel Cr12MoV band steel about 400mm, reduced greatly energy resource consumption and the metallurgical production cost of making, thereby satisfying the market is to the demand of this product.
Description of drawings
Fig. 1 is the main flow chart of milling method of the present invention.
The specific embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
Please in conjunction with shown in Figure 1, the milling method of Cr12MoV band steel of the present invention adopts the heating of soaking pit hot charging ingot casting and the rolling hot-working method of processing+blooming mill two fire that homogenizes, and produces the band steel of cold work die steel Cr12MoV.
Below take the ingot of ingot casting heavily as 2.328 tons, blooming mill as 750 milling trains, the specification of producing band steel is thickness 80~100mm, deviation 0~3.0mm; Width 300~400mm, deviation 0~8.0mm are example, carry out the concrete example explanation:
Fiery when rolling at blooming mill first, smelt 2.328 tons of ingot casting heat of casting and send the soaking pit heating: the charging temperature of ingot casting=800 ℃ are incubated 1 hour; During intensification, be warming up to 1180 ℃ with the speed of≤100 ℃/h, under 1170~1180 ℃ temperature, the steel ingot insulation pursue after 3.0 hours and is propped up a steel ingot and stand up, and reduces steel ingot male and female face temperature difference, and the steel ingot that climbs over body is incubated 1.0 hours again; Steel ingot male and female face temperature difference≤20 ℃ is carried out the hot-working cogging, enters blooming mill the first fire rolling; Blooming mill hot-working cogging: before rolling, close first the cooling water of roll, the cooling water of bearing shell suitably turns down, and avoids the cooling water of bearing shell to be splashed to the body of roll; 20 rev/mins of the speeds of rolls of nipping in blooming mill one hole; The start rolling temperature of steel ingot=1120 ℃, finishing temperature=1050 ℃; Rules passage 18 roads under the first fiery Rolling from Ingot superzapping, draught per pass≤25mm; Rolled piece returns soaking pit and again heats.Blooming mill second is fiery when rolling, and soaking pit adds heat request: the first fiery rolled piece melts down heating, and 1160~1170 ℃ of heating-up temperatures are incubated 1 hour, and steel ingot is incubated 1 hour again by standing up; Steel ingot male and female face temperature difference≤30 ℃ is carried out the hot-working cogging, enters blooming mill the second fire rolling; Blooming mill hot-working cogging requires: before the second fire is rolling, close the cooling water of roll, avoid the cooling water of bearing shell to be splashed to the body of roll; The start rolling temperature of rolled piece=1120 ℃, finishing temperature=1000 ℃; Steel ingot microcephaly afterbody end is towards front upper steel rolling; Rolled piece when the blooming mill flat-bottom hole, the speed of rolls=40 rev/min; Drafts≤25mm, drafts maximum deviation≤5mm; Hot rolling Cr12MoV band steel hot charging annealing furnace annealing in process.Difference in height 1.5mm between the Cr12MoV band steel annealing heat treatment requirements annealing furnace parallels spacing 600mm, every block of parallels; Cr12MoV band steel annealing shove charge utilizes the longitudinal overlap of band steel deadweight block-by-block to collect, and winches to the annealing furnace chassis; Speed with 100 ℃/h is warming up to 860 ℃; At 860 ℃, be incubated 14 hours; Band steel finishes 860 ℃ of insulations, with the speed cooling of≤30 ℃/h, temperature is down to≤300 ℃ come out of the stove.
Adopting production specification of the present invention is the cold work die steel Cr12MoV band steel of 80~100 * 300~400mm, have that technique is simple, organization of production is convenient, the characteristics of metallurgical low cost of manufacture, compare with the production technology of traditional " the how fiery forging band steel of ingot casting forging and pressing ", the metal billet yield can reach more than 81%, the energy resource consumption of ton steel descends greater than 41%, and metallurgical manufacturing cost reduces more than 1200 yuan/tons; Blooming mill hot-working Rolling Production 83 * 405mm, 94 * 405mm cold work die steel Cr12MoV band steel, production direct motion, steady, glacing flatness, radius of corner, surface quality are good, 5.0 grades of the irregularity of eutectic carbides, hardness number 219-224HB, product satisfies the regulation of GB/T1299-2000 standard, qualification rate 100%, remarkable in economical benefits.
Those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.

Claims (9)

1. the milling method of a Cr12MoV band steel is characterized in that,
The method comprises the steps:
A. heat is sent the Cr12MoV ingot casting, and the charging temperature of described ingot casting is at 600~800 ℃;
B. adopt soaking pit to carry out the heating of hot charging ingot casting, melt down and heat the processing that homogenizes by the first fiery ingot casting heating, the second fiery rolled piece respectively;
C. after the heating of the first fiery ingot casting and the second fiery rolled piece melt down heating, carry out respectively corresponding rolling;
D. hot rolling Cr12MoV band steel is carried out the hot charging annealing in process.
2. the production method of Cr12MoV band steel as claimed in claim 1 is characterized in that:
In steps A, choose ingot casting weight>2t, the ingot casting sectional dimension: the heavy in section is 500 * 500mm 2, small bore is 430 * 430mm 2, the ingot casting of the high 1300mm of ingot casting.
3. the production method of Cr12MoV band steel as claimed in claim 1 is characterized in that,
In step B, the step of the described first fiery ingot casting heating is:
B1. the charging temperature of controlling ingot casting is 600~800 ℃, and is incubated 100~150 minutes;
B2. the speed heating with 70~100 ℃/h makes ingot casting be warming up to 1100~1200 ℃;
B3. 1100~1200 ℃ of lower insulations 2 hours~5 hours.
4. the production method of Cr12MoV band steel as claimed in claim 3 is characterized in that,
In step B, the step that the described second fiery rolled piece melts down heating is:
B4. rolled piece is heated to 1050~1200 ℃, and is incubated 2~3 hours.
5. the production method of Cr12MoV band steel as claimed in claim 4 is characterized in that:
Melt down between the soak of heating in the heating of the described first fiery ingot casting and the second fiery rolled piece, will melt down by an ingot casting or rolled piece and stand up, reducing its male and female face temperature difference, and control male and female face temperature difference<50 ℃.
6. the production method of Cr12MoV band steel as claimed in claim 1 is characterized in that,
In step C, it is as follows that rolling after the heating of the described first fiery ingot casting requires:
C1. roll is preheated to 100~250 ℃ of temperature, and the start rolling temperature 1100-1700 of ingot casting ℃, finishing temperature>900 ℃;
C2. the roll biting speed is 10~40 rev/mins, each drafts 10~25mm;
C3. rolled piece melts down heating.
7. the production method of Cr12MoV band steel as claimed in claim 1 is characterized in that:
In step C, the described second fiery rolled piece melts down rolling after the heating and requires as follows:
C4. roll is preheated to 100~250 ℃ of temperature, and the start rolling temperature 1100-1700 of rolled piece ℃, finishing temperature>900 ℃;
C5. the roll biting speed is 10~40 rev/mins, and rolled piece is nipped rear mill speed 40-80 rev/min, each drafts 20~40mm;
C6. rolled piece melts down heating.
8. the production method of Cr12MoV band steel as claimed in claim 1 is characterized in that,
In step D, the concrete steps of described annealing in process are as follows:
D1. control annealing furnace parallels spacing≤800mm, the difference in height≤3mm between every block of parallels;
D2. the Cr12MoV band steel block-by-block longitudinal overlap after rolling is collected, winch to the annealing furnace chassis;
D3. the speed with≤70~100 ℃/h be warming up to≤870 ℃;
D4. after heating up,<870 ℃ of lower insulations 10~20 hours;
D5. after insulation finished, with the speed cooling of≤50 ℃/h, temperature was down to≤200 ℃ come out of the stove.
9. the production method of Cr12MoV band steel as claimed in claim 8 is characterized in that,
In step D5, the band steel specification after coming out of the stove is 80~100 * 300~400mm.
CN2012100753064A 2012-03-21 2012-03-21 Cr12MoV flat steel rolling method Pending CN103316910A (en)

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Application Number Priority Date Filing Date Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104624696A (en) * 2014-12-09 2015-05-20 抚顺特殊钢股份有限公司 Material forming method for D2 steel and 2.8-ton steel ingot by one-time rolling
CN106903163A (en) * 2017-03-24 2017-06-30 攀钢集团江油长城特殊钢有限公司 A kind of thick flat bar and its milling method
CN109055850A (en) * 2018-08-30 2018-12-21 成都先进金属材料产业技术研究院有限公司 Improve the preparation method of cold work die steel eutectic carbide
CN109174962A (en) * 2018-09-05 2019-01-11 攀钢集团江油长城特殊钢有限公司 A kind of corrosion resistant type plastic mould rolling band steel homogenize process method
CN109468544A (en) * 2018-11-22 2019-03-15 成都先进金属材料产业技术研究院有限公司 High carbon and chromium cold work die steel and preparation method thereof

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JPS5789459A (en) * 1980-11-20 1982-06-03 Hitachi Metals Ltd Low magnetic forming roll with resistance to wear and thermal impulse
CN1483523A (en) * 2003-07-29 2004-03-24 宝钢集团上海五钢有限公司 Productive method for cr 12 Mov rolling cogging

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104624696A (en) * 2014-12-09 2015-05-20 抚顺特殊钢股份有限公司 Material forming method for D2 steel and 2.8-ton steel ingot by one-time rolling
CN106903163A (en) * 2017-03-24 2017-06-30 攀钢集团江油长城特殊钢有限公司 A kind of thick flat bar and its milling method
CN109055850A (en) * 2018-08-30 2018-12-21 成都先进金属材料产业技术研究院有限公司 Improve the preparation method of cold work die steel eutectic carbide
CN109174962A (en) * 2018-09-05 2019-01-11 攀钢集团江油长城特殊钢有限公司 A kind of corrosion resistant type plastic mould rolling band steel homogenize process method
CN109468544A (en) * 2018-11-22 2019-03-15 成都先进金属材料产业技术研究院有限公司 High carbon and chromium cold work die steel and preparation method thereof

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