CN1483523A - Productive method for cr 12 Mov rolling cogging - Google Patents

Productive method for cr 12 Mov rolling cogging Download PDF

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Publication number
CN1483523A
CN1483523A CNA031418880A CN03141888A CN1483523A CN 1483523 A CN1483523 A CN 1483523A CN A031418880 A CNA031418880 A CN A031418880A CN 03141888 A CN03141888 A CN 03141888A CN 1483523 A CN1483523 A CN 1483523A
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rolling
steel ingot
roll
temperature
cogging
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CNA031418880A
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Chinese (zh)
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CN1186135C (en
Inventor
蔚 谢
谢蔚
胡鸿铣
葛宪平
沈燕源
顾新根
续维
陈新建
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宝钢集团上海五钢有限公司
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Abstract

The production method of Cr12MoV cogged bloom is characterized by that it adopts the cogging process of "using soaking furnace to heat steel ingot and using cogging mill to roll in two heats": (1) using soaking furnace in one heat: steel ingot weight is less than or equal to 1.5 ton, furnace-feeding temp. is less than or equal to 500 deg.c, heat-insulating time is 2 hr., heating-up speed is less than or equal to 80 deg.C/h; heat-insulating for 4 hr. turning steel ingot and difference in temperature of heat side and cold side is less than or equal to 30 deg.C; (2). using cogging mill to cog in one heat; before rolling, closing cooling water for roll, preheating roll, temp. 150 deg.C, roll speed is less than or equal to 10 rpm; (3). heating in two heats, 1170 deg.C, heat-insulating for 1.5 hr; and (4) cogging in two heats, preheating roll, roll speed is less than and equal to 10 rpm.

Description

The production method of Cr12MoV rolling-cogging

Technical field

The present invention relates to the production method of metallurgy industry mould steel hot-working cogging, refer in particular to the production method of cold work die steel hot-working cogging.

Background technology

Mould steel is special steel alloy, generally can be divided into hot die steel and cold work die steel two big classes.Cold work die steel can generally can be divided into two kinds of high-carbon low-alloy cold work die steel, high-carbon high-alloy cold work die steels again.Because the high-carbon high-alloy cold work die steel can bear heavier load, and has high wearability, be widely used in making mold materials such as cold-punching mould, cold heading die, cold extruding die, wire drawing die, thread rolling die.

At present, the traditional processing technology of " smelting ingot casting---forging and pressing cogging " is adopted in the production of high-carbon high-alloy cold work die steel basically: the metallurgical ingot casting of≤1.5t (mainly being to solve the carbide problem of non-uniform and the consideration done), through the inferior forging of 6~8 fire, just can finish the hot-working cogging of 90 * 100mm, 135 side mm, 140 side mm specifications, the production cycle is long, cost is high.

Cr12MoV is common high-carbon high-alloy cold work die steel, and its as-cast structure is a ledeburite, has quite high carbon content (1.45~1.7%) and alloying element (〉=12%).Its intrinsic characteristic is: thermal conductivity is low, plasticity is poor, resistance of deformation is big, and overheated responsive (temperature: 1200 ℃, σ b=0.8;>1200 ℃, strength degree sharply descends).During hot-working, non-uniform temperature is out of shape the inhomogeneous increase that all can cause residual stress, and easily assembled by tension, and temperature is lower than 950 ℃, and plasticity descends significantly, so the hot-working cogging belongs to the steel grade that is easy to crack.Be not difficult to find out that this steel hot processing temperature scope is narrow, thus, for a long time, the ingot casting cogging is all followed to rely on to forge and press and is finished low, the metallurgical manufacturing cost height of metal billet yield.

Summary of the invention

The present invention develops a kind of production method of Cr12MoV rolling-cogging, replace forging press to carry out the hot-working cogging with blooming mill, roll out qualified Cr12MoV steel billet, solved the problem that the high-carbon high-alloy cold work die steel Cr12MoV production cycle is long, the metal billet yield is low, reduce the metallurgical production cost of making greatly, satisfy customer requirements and market demand.

The production method of Cr12MoV rolling-cogging provided by the invention is characterized in that adopting the hot-working cogging technics of " soaking pit heating steel ingot+blooming mill two fire are rolling ", produces the Cr12MoV steel billet:

The hot-working cogging first fiery rolling requirement:

(1) soaking pit heating steel ingot: (A) steel ingot weight is 1.0~1.5 tons; (B) charging temperature of steel ingot≤500 ℃ are incubated 100~150 minutes; When (C) heating up, with speed heat temperature raising to 770~850 ℃ (strict control Cr12MoV changes at low temperature and tissue) of≤80 ℃/h, be incubated 30~60 minutes earlier; Speed with≤100 ℃/h is warming up to 1160~1190 ℃ again; (D) at 1160~1190 ℃, be incubated 4 hours~4.5 hours, between soak, steel ingot is stood up, reduce steel ingot male and female face temperature difference; (E) the hot-working cogging just can be carried out in steel ingot male and female face temperature difference≤30 ℃, and it is rolling to enter blooming mill first fire;

(2) blooming mill hot-working cogging requires: before (A) rolling, close the cooling water of roll earlier, 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; By rolling 4~6 earlier on other steel ingot of row, roll is preheated to 100~200 ℃ of temperature, allows rolling Cr12MoV; (B) blooming roll speed is with the execution of creeping (column crystal of the broken steel ingot as cast condition of similar road roller pressing physical circuit face form reduces the tension of roll to rolled piece to greatest extent), the speed of rolls≤10 rev/min; (C) start rolling temperature of steel ingot 〉=1120 ℃, finishing temperature 〉=1050 ℃, the first fiery rolling schedule passage, 25~34 roads; (D) steel ingot is when the blooming mill flat-bottom hole of preceding 20 passages is rolling, and percentage elongation and surperficial broadening amount are controlled in strictness, drafts≤20mm, and keep the rolling of a direction; (E) rolled piece melts down heating;

The hot-working cogging second fiery rolling requirement:

(3) soaking pit heating rolled piece: (A) the first fiery rolled piece melts down heating, and 1160~1180 ℃ of heating-up temperatures are incubated 1~2 hour, between soak, steel ingot are stood up; (B) the hot-working cogging just can be carried out in steel ingot male and female face temperature difference≤30 ℃, enters blooming mill

Second fire is rolling;

(4) blooming mill hot-working cogging requires: (A) second fire rolling before, close the cooling water of roll earlier, avoid the cooling water of bearing shell to be splashed to the body of roll; 100~200 ℃ of roll preheat temperatures just allow rolling Cr12MoV; (B) speed of rolls≤10 rev/min; (C) start rolling temperature of rolled piece 〉=1100 ℃, finishing temperature 〉=1050 ℃, the second fiery rolling schedule passage, 20~30 roads; (D) rolled piece is at the blooming mill flat-bottom hole, when the box hole is rolling, strict control percentage elongation and surperficial broadening amount, drafts≤40mm is (when rolled piece melts down follow-up the rolling of heating, the column crystal of steel ingot as cast condition is broken substantially, plasticity improves a lot, drafts strengthens gradually, improves carbide morphology and as cast condition open texture); (E) strip plate rollback stove is handled.

Compare with prior art, the present invention has following advantage:

1, technology is simple, workable, and organization of production is convenient;

2, the production cycle shortens greatly;

3, the metal billet yield improves greatly;

4, metallurgical manufacturing cost reduces greatly.

Description of drawings

Fig. 1 is the rolling soaking pit steel ingot heating process of blooming mill first fire

Fig. 2 is the rolling soaking pit rolled piece heating process of blooming mill second fire

Specific embodiments

Certain iron company implements patent of the present invention, adopts soaking pit heating steel ingot (ingot weighs 1.15 tons)+rolling hot-working cogging of blooming mill (800 milling train) two fire, produces Cr12MoV steel billet (140 * 140mm).Blooming mill first is fiery when rolling, soaking pit heating steel ingot: (A) charging temperature of steel ingot=480 ℃ are incubated 2 hours; When (B) heating up, the speed with 75 ℃/h is warming up to 810 ℃ earlier, is incubated 50 minutes; Speed with 95 ℃/h is warming up to 1180~1190 ℃ again; (C) under 1180~1190 ℃ temperature, the steel ingot insulation was stood up after 2.5 hours, reduced steel ingot male and female face temperature difference, and the steel ingot that climbs over body is incubated 1.5 hours again; (D) the hot-working cogging just can be carried out in steel ingot male and female face temperature difference≤30 ℃, and it is rolling to enter blooming mill first fire; Blooming mill hot-working cogging: before (A) rolling, close the cooling water of roll earlier, 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; Arrange rolling 6 earlier on other steel ingot, make 160 ℃ of roll preheat temperatures; (B) blooming roll speed is with the execution of creeping, the speed of rolls≤10 rev/min; (C) start rolling temperature of steel ingot=1140 ℃, finishing temperature=1050 ℃, the first fiery rolling schedule passage, 28 roads; (D) steel ingot is when the blooming mill flat-bottom hole of preceding 18 passages is rolling, strict control percentage elongation and surperficial broadening amount, drafts 10~20mm (column crystal of the broken steel ingot as cast condition of similar road roller pressing physical circuit face form, reduce the tension of roll to greatest extent to rolled piece), and keep the rolling of a direction; (E) rolled piece returns soaking pit and heats once more.Blooming mill second is fiery when rolling, and soaking pit heating steel ingot requires: (A) the first fiery rolled piece melts down heating, and 1170~1180 ℃ of heating-up temperatures are incubated 1 hour and stand up, and are incubated half an hour again; (B) the hot-working cogging just can be carried out in steel ingot male and female face temperature difference≤30 ℃, and it is rolling to enter blooming mill second fire; Blooming mill hot-working cogging requires: (A) second fire rolling before, close the cooling water of roll, avoid the cooling water of bearing shell to be splashed to the body of roll; Roll preheat temperature=150 ℃; (B) speed of rolls=10 rev/min; (C) start rolling temperature of rolled piece=1120 ℃, finishing temperature=1070 ℃, the second fiery rolling schedule passage, 27 roads; (D) rolled piece is at the blooming mill flat-bottom hole, when the box hole is rolling, strict control percentage elongation and surperficial broadening amount are (when rolled piece melts down follow-up the rolling of heating, the column crystal of steel ingot as cast condition is broken substantially, plasticity improves a lot, drafts strengthens gradually, improve carbide morphology and as cast condition open texture), drafts=20~40mm; (F) strip plate rollback stove is handled.Implement patent of the present invention Cr12MoV is carried out the hot-working cogging, have that technology is simple, organization of production is convenient, the characteristics of metallurgical low cost of manufacture, compare with traditional " smelting ingot casting---forging and pressing cogging " production technology, production cycle shortens more than 10 times, the metal billet yield is more than 81%, and metallurgical manufacturing cost reduces by 600 yuan/ton more than the steel; The Φ 65mm finished product material of making by 140 side mm Cr12MoV (blooming mill hot-working cogging production), material amount all satisfies the regulation (see Table, table two) of GB/T1299-2000 standard in it, meet the product quality requirement, the billet surface quality is better than forging and pressing cogging, steel ingot cogging, the qualification rate 100% of becoming a useful person, remarkable in economical benefits.

The metal billet yield of bloom, low multiple quality

Table 1 Heat (batch) number 1.15 ton steel ingot 140 side mm steel billets Billet yield, % Sample Middle pine Segregation The eutectic net carbide Quantity Weight, ton Quantity Weight, ton 252- 1584 8 9.20 32 7.565 ?71.74 Sample C portion 2.5 ?1.5 ????5.0 Sample A portion 2.5 ?1.5 ????5.0 252- 1456 1 1.15 4 0.825 ?82.23 Sample C portion 2.0 ?1.0 ????5.0 Sample A portion 1.0 ?1.0 ????4.5 Add up to 9 10.35 36 8.39 ?81.06

Φ 65mm finished product material low multiple quality and annealing hardness test result

Table 2 Heat (batch) number: 252-1584 The number of rolling: 2B-6124 Specification Φ 65mm Operative norm: GB1299-85 Specimen coding Middle pine Segregation Decarburization The eutectic net carbide Quenching hardness (HRC) Annealing hardness (HB) ?296# ??1.0 ?1.0 ?0.47mm 3.5 ????60 ????234 ?297# ??1.0 ?1.0 ?0.55mm 3.5 ????60 ????249

Claims (1)

1, the production method of Cr12MoV rolling-cogging is characterized in that adopting the hot-working cogging technics of " soaking pit heating steel ingot+blooming mill two fire are rolling ", produces the Cr12MoV steel billet: the hot-working cogging first fiery rolling requirement:
When (1) soaking pit heated steel ingot: (A) steel ingot weight was 1.0~1.5 tons; (B) charging temperature of steel ingot≤500 ℃ are incubated 100~150 minutes; When (C) heating up, with speed heat temperature raising to 770~850 of≤80 ℃/h ℃, be incubated 30~60 minutes earlier; Speed with≤100 ℃/h is warming up to 1160~1190 ℃ again; (D) at 1160~1190 ℃, be incubated 4 hours~4.5 hours, between soak, steel ingot is stood up, reduce steel ingot male and female face temperature difference; (E) steel ingot male and female face temperature difference≤30 ℃, it is rolling to enter blooming mill first fire;
(2) during blooming mill hot-working cogging: before (A) rolling, close the cooling water of roll earlier, and avoid the cooling water of bearing shell to be splashed to the body of roll; Roll is preheated to 100~200 ℃ of temperature; (B) blooming roll speed is with the execution of creeping, the speed of rolls≤10 rev/min; (C) start rolling temperature of steel ingot 〉=1120 ℃, finishing temperature 〉=1050 ℃, the first fiery rolling schedule passage, 25~34 roads; (D) steel ingot is when the blooming mill flat-bottom hole of preceding 20 passages is rolling, drafts≤20mm, and keep the rolling of a direction; (E) rolled piece melts down heating;
The hot-working cogging second fiery rolling requirement:
When (3) soaking pit heated rolled piece: (A) the first fiery rolled piece melted down heating, and 1160~1180 ℃ of heating-up temperatures are incubated 1~2 hour, between soak, steel ingot are stood up; (B) the hot-working cogging just can be carried out in steel ingot male and female face temperature difference≤30 ℃, and it is rolling to enter blooming mill second fire;
(4) during blooming mill hot-working cogging: (A) second fire rolling before, close the cooling water of roll earlier, avoid the cooling water of bearing shell to be splashed to the body of roll; 100~200 ℃ of roll preheat temperatures; (B) speed of rolls≤10 rev/min; (C) start rolling temperature of rolled piece 〉=1100 ℃, finishing temperature 〉=1050 ℃, the second fiery rolling schedule passage, 20~30 roads; (D) rolled piece is at the blooming mill flat-bottom hole, when the box hole is rolling, drafts≤40mm; (E) strip plate rollback stove is handled.
CN 03141888 2003-07-29 2003-07-29 Productive method for Cr 12 Mov rolling cogging CN1186135C (en)

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Application Number Priority Date Filing Date Title
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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1293960C (en) * 2005-03-04 2007-01-10 宝钢集团上海五钢有限公司 Heat keeping and forging and blank cogging method for GH742 alloy large steel ingot
CN1302129C (en) * 2004-06-11 2007-02-28 宝钢集团上海五钢有限公司 Rolling and cogging method for OCr17Ni4Cu4Nb casting ingots
CN102407236A (en) * 2010-09-20 2012-04-11 宝山钢铁股份有限公司 Machining and manufacturing method of steel plate of die steel
CN102581000A (en) * 2011-01-10 2012-07-18 宝山钢铁股份有限公司 Production method for rolling and cogging big cast ingot of high-carbon high-alloy cold-working die steel
CN102836870A (en) * 2011-06-23 2012-12-26 宝山钢铁股份有限公司 Rolling and cogging production method for large austenite stainless and heat-resistant gas valve steel 21-4N ingot
CN103273272A (en) * 2013-06-04 2013-09-04 中国科学院金属研究所 Forging-and-rolling compounded forming method for comprehensively promoting internal and external quality of wide and thick plate blanks
CN103290204A (en) * 2013-06-29 2013-09-11 济钢集团有限公司 Process for heating carbon steel and low-alloy steel heavy piece-weight composite blank
CN103316910A (en) * 2012-03-21 2013-09-25 宝山钢铁股份有限公司 Cr12MoV flat steel rolling method
CN103352171A (en) * 2013-07-12 2013-10-16 抚顺特殊钢股份有限公司 High-alloy steel D2 rolling method
CN103882201A (en) * 2014-03-19 2014-06-25 武汉钢铁(集团)公司 Rolling process capable of improving hot-upsetting performance of 20 Cr steel
CN103909092A (en) * 2014-03-24 2014-07-09 湖北时力模具材料有限公司 One-fire rolling method for Cr12MoV cold working die flat steel
CN104014703A (en) * 2014-06-16 2014-09-03 安徽省瑞杰锻造有限责任公司 Forging process for C12MoV twisting rollers
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
CN109482656A (en) * 2018-10-26 2019-03-19 成都先进金属材料产业技术研究院有限公司 The rolling-cogging production method of 416 free cutting stainless steels
CN109530429A (en) * 2018-11-14 2019-03-29 宝钢特钢韶关有限公司 A kind of rolling mill practice of steady production martensite air-valve steel rolling base
CN109530432A (en) * 2018-11-22 2019-03-29 宝钢特钢韶关有限公司 A kind of rolling mill practice improving 110 specification H13 ultrasonic inspection qualification rate of Φ

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1302129C (en) * 2004-06-11 2007-02-28 宝钢集团上海五钢有限公司 Rolling and cogging method for OCr17Ni4Cu4Nb casting ingots
CN1293960C (en) * 2005-03-04 2007-01-10 宝钢集团上海五钢有限公司 Heat keeping and forging and blank cogging method for GH742 alloy large steel ingot
CN102407236B (en) * 2010-09-20 2014-01-15 宝山钢铁股份有限公司 Machining and manufacturing method of steel plate of die steel
CN102407236A (en) * 2010-09-20 2012-04-11 宝山钢铁股份有限公司 Machining and manufacturing method of steel plate of die steel
CN102581000A (en) * 2011-01-10 2012-07-18 宝山钢铁股份有限公司 Production method for rolling and cogging big cast ingot of high-carbon high-alloy cold-working die steel
CN102581000B (en) * 2011-01-10 2014-04-30 宝钢特钢有限公司 Production method for rolling and cogging big cast ingot of high-carbon high-alloy cold-working die steel
CN102836870A (en) * 2011-06-23 2012-12-26 宝山钢铁股份有限公司 Rolling and cogging production method for large austenite stainless and heat-resistant gas valve steel 21-4N ingot
CN102836870B (en) * 2011-06-23 2015-04-01 宝钢特钢有限公司 Rolling and cogging production method for large austenite stainless and heat-resistant gas valve steel 21-4N ingot
CN103316910A (en) * 2012-03-21 2013-09-25 宝山钢铁股份有限公司 Cr12MoV flat steel rolling method
CN103273272A (en) * 2013-06-04 2013-09-04 中国科学院金属研究所 Forging-and-rolling compounded forming method for comprehensively promoting internal and external quality of wide and thick plate blanks
CN103273272B (en) * 2013-06-04 2015-05-27 中国科学院金属研究所 Forging-and-rolling compounded forming method for comprehensively promoting internal and external quality of wide and thick plate blanks
CN103290204A (en) * 2013-06-29 2013-09-11 济钢集团有限公司 Process for heating carbon steel and low-alloy steel heavy piece-weight composite blank
CN103352171A (en) * 2013-07-12 2013-10-16 抚顺特殊钢股份有限公司 High-alloy steel D2 rolling method
CN103352171B (en) * 2013-07-12 2016-12-28 抚顺特殊钢股份有限公司 A kind of milling method of high-alloy steel D2
CN103882201A (en) * 2014-03-19 2014-06-25 武汉钢铁(集团)公司 Rolling process capable of improving hot-upsetting performance of 20 Cr steel
CN103909092B (en) * 2014-03-24 2015-11-25 湖北时力模具材料有限公司 A kind of heating once and rolling method of Cr12MoV cold-work die band steel
CN103909092A (en) * 2014-03-24 2014-07-09 湖北时力模具材料有限公司 One-fire rolling method for Cr12MoV cold working die flat steel
CN104014703A (en) * 2014-06-16 2014-09-03 安徽省瑞杰锻造有限责任公司 Forging process for C12MoV twisting rollers
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
CN109482656A (en) * 2018-10-26 2019-03-19 成都先进金属材料产业技术研究院有限公司 The rolling-cogging production method of 416 free cutting stainless steels
CN109530429A (en) * 2018-11-14 2019-03-29 宝钢特钢韶关有限公司 A kind of rolling mill practice of steady production martensite air-valve steel rolling base
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
CN109530432A (en) * 2018-11-22 2019-03-29 宝钢特钢韶关有限公司 A kind of rolling mill practice improving 110 specification H13 ultrasonic inspection qualification rate of Φ

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Effective date: 20131216