CN1247328C - Rolling cogging production method of Cr4Mo4V electroslag steel ingot - Google Patents
Rolling cogging production method of Cr4Mo4V electroslag steel ingot Download PDFInfo
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- CN1247328C CN1247328C CN 200410053946 CN200410053946A CN1247328C CN 1247328 C CN1247328 C CN 1247328C CN 200410053946 CN200410053946 CN 200410053946 CN 200410053946 A CN200410053946 A CN 200410053946A CN 1247328 C CN1247328 C CN 1247328C
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 91
- 239000010959 steel Substances 0.000 title claims abstract description 91
- 238000005096 rolling process Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000000137 annealing Methods 0.000 claims abstract description 5
- 238000002791 soaking Methods 0.000 claims description 13
- 235000019504 cigarettes Nutrition 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000005242 forging Methods 0.000 abstract description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000008520 organization Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 239000000498 cooling water Substances 0.000 description 7
- 230000035882 stress Effects 0.000 description 7
- 230000005496 eutectics Effects 0.000 description 4
- 239000011651 chromium Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910001349 ledeburite Inorganic materials 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
- Forging (AREA)
Abstract
The present invention relates to a producing method for rolling and blooming a Cr4Mo4V electroslag steel ingot. The present invention is characterized in that a square steel bloom with the thickness of 100mm is produced by heating by a pit heating furnace and blooming by a blooming mill. The method comprises the steps that (1) the steel ingots with the single weight of at most 1.7 tons are heated for 90 minutes in the heating furnace at a temperature of 630 DEG C, for 60 minutes at 900 DEG C from 80 DEG C per hour, and for 210 minutes at 1190 DEG C from 80 DEG C per hour and are turned over piece by piece, and the temperature difference of the front surface and the rear surface of each steel ingot is at most 20 DEG C to move the steel ingots out of the pit heating furnace; (2) the steel ingots are rolled and bloomed under the conditions of roller preheating, a beginning rolling temperature of at least 1130 DEG C, a finishing rolling temperature of at least 1000 DEG C, rolling by one fire for two stages, hot processing for 44 times and conventional destressing processing in an annealing furnace after the rolled bloom is cut by heating, wherein the steel ingots are rolled at a slow speed of 20 turns per minute with the rolling quantity of at most 30mm in the first 20 times and are rolled at a high speed with the rolling quantity of at most 50mm. The present invention has the characteristics of easy technology and convenient production organization and a finished steel bloom has the advantages of good surface quality, stable internal material quality, carbide unevenness superiority to that of a forging bloom, high metal bloom forming rate by more than 1%, low cost by more than 2000 yuan per ton and obvious economic benefit.
Description
Technical field
The present invention relates to the production method of metallurgy industry bearing steel hot-working cogging, especially refer to the hot-working cogging production method of high-temperature bearing steel.
Background technology
Bearing steel is common steel alloy.Characteristic and applied environment by steel can be divided into: high-carbon-chromium bearing steel, carburizing bearing steel, high-temperature bearing steel, stainless bearing steel and special-purpose special bearing material.The high-temperature bearing steel is special bearing steel, be applicable to high temperature, at a high speed, the special bearing steel of working under the harsh conditions such as high load capacity, it is one of steel grade that Interventions Requested are many, quality requirement tight, the production difficulty is big.Along with the development of China's Aviation Industry, the demand of high-temperature bearing steel increases fast.
Cr4Mo4V high-temperature bearing steel (the M50 steel that is equivalent to the U.S.) belongs to ledeburite steel, is aero-engine main shaft bearing material, and this steel is on active service under 350 ℃ of conditions, and parts of bearings still keeps high hardness and wearability (YB688-76 technical conditions).The Cr4Mo4V steel contains strong carbide forming elements such as Cr, Mo, V, forms type carbide such as M6C, M23C6, MC, M2C, M7C3, and they are present in the steel ingot with the eutectic carbide form, and the increase of matrix fragility, the plasticity of steel are descended; And higher eutectic carbide unevenness makes steel ingot easily overheated, burning of when heating, causes the control difficulty of steel ingot firing rate, temperature, soaking time; Simultaneously, the alloy content of this steel causes the resistance of deformation of steel bigger (hot-working just is difficulty relatively) than higher (contain Cr, about 4.2% Mo, about 1% V about 4%, and other alloy).In addition, owing to Cr4Mo4V steel alloy content height, poor thermal conductivity, when making steel ingot cooling, hot-working, easy to crack.During Cr4Mo4V steel ingot hot-working cogging, being out of shape the inhomogeneous residual stress that easily causes steel increases, and deformation temperature is when being lower than 950 ℃, and the plasticity of this steel obviously descends, and billet surface very easily ftractures.Therefore, the inherent characteristic of high-temperature bearing steel Cr4Mo4V is: thermal conductivity is low, and plasticity is poor, and resistance of deformation is big, and overheated responsive, the hot processing temperature scope is narrow, and hot-working cogging control is improper very easily cracks.
It is generally acknowledged: for the bearing steel steel grade of ledeburite organization, eutectic carbide is thick, skewness, and resistance of deformation is big, should adopt the technological process of hot-working hammer cogging, be beneficial to the fragmentation of carbide, reduce the unevenness of eutectic carbide, also help controlling the generation of billet surface seminess.Therefore, high-temperature bearing steel Cr4Mo4V hot-working cogging technics all is to depend on to forge to finish at present, adopts: forging and pressing cogging → 100～140 side mm steel billet → annealing in process that electroslag ingot (≤2.0 tons) → forging press is many fiery time.The deficiency of this production technology is: the metal displacement of hammer cogging is little, and the carbide unevenness grading of steel billet is still higher, and metal consumption is also bigger simultaneously; The production capacity of hot-working hammer cogging technology that even more serious is is very low, and the production cycle is very long, causes metallurgical manufacturing cost high.This production scale is little, " slow ox formula " mode of production of batch process difficulty, can not satisfy the market demand of Cr4Mo4V high-temperature bearing steel.
Summary of the invention
The present invention develops a kind of rolling-cogging production method of Cr4Mo4V electroslag ingot; substitute forging press with blooming mill and carry out the hot-working cogging; stable, the good Cr4Mo4V steel billet of surface quality of material amount in rolling out; realized the industrial production of scale; greatly improved prouctiveness, shortened the production cycle, raw material metal consumes little; reduce metallurgical manufacturing cost significantly, satisfied user and market demand.
The rolling-cogging production method of Cr4Mo4V electroslag ingot provided by the invention, it is characterized in that adopting soaking pit heating ESR ingot+blooming mill (rolling mill that is used for steel ingot hot-working cogging, be referred to as blooming mill) the hot-working cogging of heating once and rolling, produce Cr4Mo4V high-temperature bearing steel steel billet:
The first step, soaking pit heating electroslag ingot:
(1) electroslag ingot individual cigarette weight (1.5～2.0) * 10
3Kilogram, cross dimensions: Φ 460～Φ 510 * 1700mm;
(2) the steel ingot soaking pit of packing into, 600～650 ℃ of the charging temperatures of steel ingot are incubated 90～120 minutes;
(3) with 60～80 ℃/hour speed heat temperature raising to 900～950 ℃, be incubated 60～90 minutes;
(4) ℃ (temperature is low excessively, can not guarantee the high-temp plastic of steel with 60～80 ℃/hour speed heat temperature raising to 1180～1200 again; Temperature is too high, and the easy alligatoring of the metallographic structure of steel, even produce overheated, the burn-off phenomenon of steel ingot causes rolling failure), be incubated 210～240 minutes, between soak, steel ingot pursued to prop up stand up, make the steel ingot temperature even;
(5) steel ingot male and female face temperature difference≤20 ℃, steel ingot goes out soaking pit, enters blooming mill hot-working rolling-cogging; Second step, the blooming mill rolling-cogging:
(1) before rolling, close the roll cooling water 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, and roll is preheated to 150～250 ℃ of temperature;
(2) start rolling temperature of steel ingot 〉=1130 ℃, and finishing temperature 〉=1000 ℃ (temperature＜1000 ℃, the resistance of deformation of steel all increases, steel billet ftractures easily);
(3) the hot-working cogging of steel ingot is a heating once and rolling, divide two stages totally 39～45 depress passage and finish: the phase I, depress passage 15～24 roads, blooming mill rolling at a slow speed (column crystal, carbide that broken electroslag ingot as cast condition is thick, reduce the tension of roll to greatest extent to rolled piece), the speed of rolls is controlled at 10～20 rev/mins, and (drafts is big for drafts 20～30mm, cracking phenomena may take place in the improvement not yet in effect of the thick column crystal of steel ingot as cast condition); Second stage, drafts strengthens gradually, drafts 30～50mm, and fast speed rolling (temperature is low excessively, the rolling-cogging difficulty);
(4) after the strip plate hot shearing, 100 * 100～140 * 140mm
2Finished product steel billet advance and retreat stove, carry out conventional stress relief annealing heat treatment.There is bigger residual stress in the finished product steel billet, and along with the reduction of temperature, residual stress increases, and these stress (thermal stress, structural stress) generally exist with the tension form, make steel billet easily produce cracking.
Compare with prior art, the present invention has following advantage:
1. technology is easy rationally, and is workable;
2. the production cycle shortens greatly, and organization of production is convenient, satisfies the large-scale production requirement;
3. the metal billet yield improves, steady quality;
4. metallurgical manufacturing cost reduces greatly.
Specific embodiments
Certain iron company implements patent of the present invention, and (ingot weighs 1.5 * 103 kilograms～2.0 * 10 to adopt soaking pit heating Cr4Mo4V electroslag ingot
3Kilogram, Φ 510/ Φ 460 * 1700mm weighs 1.7 * 10 with ingot
3Kilogram be an example)+the hot-working cogging technics of blooming mill (Φ 750 milling trains) heating once and rolling, production Cr4Mo4V high-temperature bearing steel billet (finished product steel billet specification 100 * 100～140 * 140mm
2, with 100 * 100mm
2Be example): the first step, soaking pit heating electroslag ingot, (1) electroslag ingot individual cigarette weight 1.7 * 10
3Kilogram; (2) the steel ingot soaking pit of nearly roll line of packing into, 630 ℃ of the charging temperatures of steel ingot are incubated 90 minutes; (3) with 80 ℃/hour speed heat temperature raising to 900 ℃, be incubated 60 minutes; (4) again with 80 ℃/hour speed heat temperature raising to 1190 ℃; (5) at 1190 ℃, be incubated 120 minutes, open bell then, steel ingot is stood up by propping up; After covering bell, steel ingot continues insulation 90 minutes at 1190 ℃, makes the steel ingot temperature even; (6) the steel ingot male and female face poor≤20 ℃, go out soaking pit, enter blooming mill hot-working rolling-cogging; In second step, blooming mill hot-working rolling-cogging is before (1) is rolling, close the roll cooling water 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, closing under the prerequisite of cooling water earlier, 4～6 on rolling other steel ingot is preheated to 150～250 ℃ of temperature with roll; (2) start rolling temperature of steel ingot 〉=1130 ℃, finishing temperature 〉=1000 ℃; (3) the hot-working cogging of steel ingot is a heating once and rolling, divide two stages totally 45 depress passage and finish: the phase I, depress passage 20 roads, blooming mill is rolling at a slow speed, the speed of rolls is controlled at 10～20 rev/mins, drafts 20～30mm; Second stage, drafts strengthens gradually, drafts 30～50mm, and fast speed rolling; (4) after strip plate is sheared, 100 * 100～140 * 140mm
2Finished product steel billet advance and retreat stove carry out conventional stress relief annealing heat treatment.
Implement patent of the present invention, the Cr4Mo4V electroslag ingot is carried out the hot-working cogging, it is easy to have technology, organization of production is convenient, and the characteristics of metallurgical low cost of manufacture are compared with the traditional processing technology of " electroslag ingot---forging and pressing cogging ", production cycle shortens greatly, the metal billet yield improves more than 1% (80.59%), and metallurgical manufacturing cost reduces more than 2000 yuan/ton, 100 * 100mm of production
2The finished product steel billet, surface quality is good, and interior material amount is stable, and the carbide unevenness is better than forging stock and (sees Table 1; The carbide unevenness is more little, is that raw material metallic article life-span of producing is long more with the Cr4Mo4V steel.), meet the regulation of standard, remarkable in economical benefits.
The macrostructure of Cr4Mo4V forging stock, strip plate and carbide unevenness contrast table
Table 1
| Technology | Specification (mm) | Sample site | Macrostructure | 1/4 place's carbide unevenness rank | ||
| General Loosen | Center porosity | Segregation | ||||
| Forge | 90×100 | A | 0.5 | 0 | 0 | 2.5 |
| C | 0.5 | 0 | 0 | 2.5 | ||
| Breaking down | 100×100 | A | 0.5 | 0 | 0 | 1.5 |
| C | 0.5 | 0 | 0 | 1.5 | ||
● the YB9-59 evaluation is pressed in the macrostructure grading of steel
● the carbide unevenness of steel is pressed the GB/T14979-1994 grading
Claims (1)
1, the rolling-cogging production method of Cr4Mo4V electroslag ingot is characterized in that adopting the hot-working cogging of soaking pit heating ESR ingot+blooming mill heating once and rolling, produces Cr4Mo4V high-temperature bearing steel steel billet:
The first step, soaking pit heating electroslag ingot:
(1) electroslag ingot individual cigarette weight (1.5～2.0) * 103 kilogram, cross dimensions: Φ 460～Φ 510 * 1700mm;
(2) the steel ingot soaking pit of packing into, 600～650 ℃ of the charging temperatures of steel ingot are incubated 90～120 minutes;
(3) with 60～80 ℃ speed heat temperature raising to 900～950 ℃ per hour, be incubated 60～90 minutes;
(4) again with 60～80 ℃ speed heat temperature raising to 1180～1200 ℃ per hour, be incubated 210～240 minutes, between soak, steel ingot pursued stand up, make the steel ingot temperature even;
(5) steel ingot male and female face temperature difference≤20 ℃ go out soaking pit, enter blooming mill hot-working rolling-cogging; Second step, the blooming mill rolling-cogging:
(1) before rolling, roll is preheated to 150～250 ℃ of temperature;
(2) start rolling temperature of steel ingot 〉=1130 ℃, finishing temperature 〉=1000 ℃;
(3) the hot-working cogging of steel ingot is a heating once and rolling, divide two stages totally 39～45 depress passage and finish: the phase I, depress passage 15～24 roads, blooming mill is rolling at a slow speed, the speed of rolls is controlled at 10～20 rev/mins, drafts 20～30mm; Second stage, drafts strengthens gradually, drafts 30～50mm, and fast speed rolling;
(4) after the strip plate hot shearing, 100 * 100～140 * 140mm
2Finished product steel billet advance and retreat stove, carry out conventional stress relief annealing heat treatment.
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| CN 200410053946 CN1247328C (en) | 2004-08-24 | 2004-08-24 | Rolling cogging production method of Cr4Mo4V electroslag steel ingot |
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| CN 200410053946 CN1247328C (en) | 2004-08-24 | 2004-08-24 | Rolling cogging production method of Cr4Mo4V electroslag steel ingot |
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| CN1586749A CN1586749A (en) | 2005-03-02 |
| CN1247328C true CN1247328C (en) | 2006-03-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| CN102294353B (en) * | 2011-08-18 | 2013-03-20 | 山西太钢不锈钢股份有限公司 | Steel rolling method |
| CN102605274B (en) * | 2012-03-26 | 2014-07-02 | 宝钢特钢有限公司 | Steel for blade of turbine and manufacturing method of the steel |
| CN103121034B (en) * | 2013-03-01 | 2015-02-25 | 浙江青山钢铁有限公司 | Super duplex stainless steel ingot hot working cogging method |
| CN103146978B (en) * | 2013-03-07 | 2014-10-29 | 邢台钢铁有限责任公司 | Method for producing high-chromium low-phosphorus electroslag steel for rollers |
| CN104294031B (en) * | 2014-10-14 | 2016-05-18 | 洛阳Lyc轴承有限公司 | A kind of high-temperature bearing steel ring high pressure gas quenching technique |
| CN111974801A (en) * | 2020-08-13 | 2020-11-24 | 无锡市城南带钢有限公司 | Method for producing hot-rolled strip steel |
| CN112496032B (en) * | 2020-11-23 | 2022-09-02 | 浙江天马轴承集团有限公司 | Rolling production process of 30Cr15MoN high-nitrogen martensitic stainless steel bar |
| CN113843283A (en) * | 2021-09-28 | 2021-12-28 | 成都先进金属材料产业技术研究院股份有限公司 | Preparation method of large-size cold-work die steel billet |
| CN114643280B (en) * | 2022-04-19 | 2023-04-11 | 山西太钢不锈钢股份有限公司 | Hot rolling method of niobium-containing austenitic stainless steel section |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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