CN1186135C - Productive method for Cr 12 Mov rolling cogging - Google Patents
Productive method for Cr 12 Mov rolling cogging Download PDFInfo
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- CN1186135C CN1186135C CN 03141888 CN03141888A CN1186135C CN 1186135 C CN1186135 C CN 1186135C CN 03141888 CN03141888 CN 03141888 CN 03141888 A CN03141888 A CN 03141888A CN 1186135 C CN1186135 C CN 1186135C
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- 238000005096 rolling process Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 66
- 239000010959 steel Substances 0.000 claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000000498 cooling water Substances 0.000 claims abstract description 15
- 238000002791 soaking Methods 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 239000000155 melt Substances 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 238000005242 forging Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 2
- 235000011613 Pinus brutia Nutrition 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910001349 ledeburite Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
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Abstract
The present invention relates to a production method for the Cr 12 MoV rolling cogging. The present invention is characterized in that the cogging technology of a soaking furnace heating steel ingot plus blooming mill double-heat rolling. (1) The soaking furnace is heated by one heat: the weight of the steel ingot is less than or equal to 1.5 ton. The furnace temperature is less than or equal to 500 DEG C and the temperature is kept for two hours, and the heating-up speed is less than or equal to 80 DEG C / h. The temperature of 1180 DEG C is kept for four hours. During the heat insulation, the steel ingot is turned over and the temperature difference between the male and female face is less than or equal to 30 DEG C. (2) The blooming mill is cogged by one heat. Before rolling, the cooling water of a roller is closed. The roller is preheated, and the temperature is about 150 DEG C. The roll speed is less than or equal to 10 rpm, and the finishing temperature is larger or equal to 1050 DEG C. The rolling reduction of the rolling is less than or equal to 20mm, and the rolling of the same direction is kept. A rolled piece is heated by return. (3) The double-heat is used for heating: the temperature of 1170 DEG C is kept for 1.5 hours. (4) The double-heat is used for the cogging: the roller is preheated. The roll speed is less than or equal to 10 rpm, and the finishing temperature of a rolled piece is larger or equal to 1050 DEG C. The rolling reduction is less than or equal to 40mm. The present invention is used for the hot work cogging of the Cr 12 MoV and has the characteristics of simple manufacturing process, short periodicity, excellent steel billet surface quality and low cost. The production quality accords with the standard requirement of GB/T1299-2000, and the economic benefit is obvious.
Description
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 that cold work die steel heat adds 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; Arrange rolling 4～6 earlier on other steel ingot, 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 ℃, and it is rolling to enter blooming mill second fire;
(4) blooming mill heat adds the cogging requirement: (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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 03141888 CN1186135C (en) | 2003-07-29 | 2003-07-29 | Productive method for Cr 12 Mov rolling cogging |
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| CN 03141888 CN1186135C (en) | 2003-07-29 | 2003-07-29 | Productive method for Cr 12 Mov rolling cogging |
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| CN1186135C true CN1186135C (en) | 2005-01-26 |
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Effective date of registration: 20131216 Address after: 200940 Baoshan District aquatic Road, Shanghai, No. 1269 Patentee after: BAOSTEEL SPECIALSTEEL CO., LTD. Address before: 201900 Fujin Road, Shanghai, orchard, Baoshan District Patentee before: Baoshan Iron & Steel Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050126 Termination date: 20200729 |
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| CF01 | Termination of patent right due to non-payment of annual fee |