CN103882201A - Rolling process capable of improving hot-upsetting performance of 20 Cr steel - Google Patents
Rolling process capable of improving hot-upsetting performance of 20 Cr steel Download PDFInfo
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- CN103882201A CN103882201A CN201410102250.6A CN201410102250A CN103882201A CN 103882201 A CN103882201 A CN 103882201A CN 201410102250 A CN201410102250 A CN 201410102250A CN 103882201 A CN103882201 A CN 103882201A
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Abstract
The invention discloses a rolling process capable of improving hot-upsetting performance of 20 Cr steel. The rolling process comprises the following steps: billet heating, descaling, rolling and cooling, wherein the heating schedule of the billet heating step is as follows: the tapping temperature is 1080-1150 DEG C, the temperature of a soaking zone is 1160-1210 DEG C, the temperature of a heating zone II is 1170-1220 DEG C, the temperature of a heating zone I is 1100-1150 DEG C, the preheating temperature is 800-850 DEG C, the soaking time is 40-60 minutes, and the total heating time is not less than 120 minutes; the initial rolling temperature of the rolling step is 1050-1120 DEG C, and the final temperature is 850-950 DEG C. The method disclosed by the invention is simple and practicable, low in cost, without the need of adding or updating the existing equipment, and capable of increasing the pass percent of the rolled hot-upsetting performance of 20 Cr steel to not less than 95% from not greater than 70% of the traditional process.
Description
Technical field
The rolling technology that the present invention relates to a kind of 20Cr of raising steel hot heading performance, belongs to technical field of steel rolling.
Background technology
20Cr steel is most typical basic kind in chromium alloy structure iron, market demand is huge, the manufacturing such as automobile, mining machinery be widely used in manufacturing heart portion requirement of strength compared with high, surperficial taking up wear, sectional dimension below 30mm or shape compared with carburized parts complicated and that load is little, as gear, gear shaft, cam, wrist pin, worm screw etc.; Or for requiring the part of the little and high-wearing feature of heat treatment deformation, after carburizing, can carry out high-frequency surface hardening; Or large and bear the modified part of medium impact load for working speed, in Chinese national economy and national defense construction, play an important role.
20Cr steel can be divided into " thermal pressure processing steel " and " machining steel " by condition of delivery, only have the steel that hot upset test is qualified to deliver goods according to " thermal pressure processing steel ", the underproof steel of hot upset test must be delivered goods according to " machining steel ".Because thermal pressure processing has better economic benefit and the larger market requirement with 20Cr steel, therefore improve 20Cr hot heading performance, can effectively increase added value of product, significantly strengthen product profitability.
The factors such as 20Cr steel hot heading performance and purity of steel (harmful element N, O, S, P content, inclusion rank etc.), organization type, grain fineness number size and surface (scratch, folding etc.) defect are relevant.And along with the progress of steelmaking equipment and level, purity of steel improves constantly, the factor of restriction 20Cr steel hot heading performance mainly concentrates on rolling technology.Reasonably rolling technology can be avoided the appearance of martensite, upper bainite or Wei Shi body tissue, reduces material structure defect, eliminates stress concentration in material deformation process, side face brittle cracking and diagonal cracking while avoiding hot upset test; Meanwhile, by adjusting rolling technology and status of equipment, guarantee the surface quality that product is good, can effectively reduce the cracking source of crizzle and longitudinal cracking in hot heading process, avoid the generation of hot heading defect.
Thereby it is a kind of effective, with low cost and without the method for extra interpolation equipment improving 20Cr steel hot heading performance by rational rolling technology.
Summary of the invention:
The object of the present invention is to provide a kind of rolling technology of the 20Cr of raising steel hot heading performance, to solve 20Cr steel hot heading problem of Cracking, thereby the high-level efficiency of realization, low cost production have the thermal pressure processing 20Cr steel of high added value.
For achieving the above object, the technical solution used in the present invention is:
A rolling technology that improves 20Cr steel hot heading performance, comprises heating steel billet, de-scaling, rolling and cooling step;
The heating cycle of described heating steel billet step is: tapping temperature: 1080～1150 DEG C, soaking zone temperature: 1160～1210 DEG C, heating two district's temperature: 1170～1220 DEG C, heating one district's temperature: 1100～1150 DEG C, preheating temperature: 800～850 DEG C, soaking time: 40～60min, total heat-up time: >=120min;
The start rolling temperature of described rolling step is 1050～1120 DEG C, and finishing temperature is 850～950 DEG C.
Further, the heating cycle of described heating steel billet step is: tapping temperature: 1095～1140 DEG C, soaking zone temperature: 1185～1205 DEG C, heating two district's temperature: 1175～1210 DEG C, heating one district's temperature: 1125～1145 DEG C, preheating temperature: 800～835 DEG C, soaking time: 45～60min, total heat-up time: 120～145min;
Further, the start rolling temperature of described rolling step is 1075～1095 DEG C, and finishing temperature is 920～940 DEG C.
The inventive method is simple, with low cost, add or upgrading existing installation without extra, can make the 20Cr steel that rolling becomes a useful person hot heading performance qualification rate by traditional technology≤70% bring up to >=95%.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed explanation.
The rolling technology of embodiments of the invention and comparative example includes heating steel billet, de-scaling, rolling and cooling step, and difference is only that opening of heating steel billet system, rolling prick temperature and whole Zha Wendu.
The heating steel billet system of each embodiment and comparative example is in table 1, and the qualification rate of opening bundle temperature, whole Zha Wendu and hot heading performance of rolling is in table 2.
As can be seen from Table 2, adopt rolling 20Cr steel of the present invention, hot heading qualification rate >=95%, more traditional rolling technology (hot heading qualification rate≤70%) has significant technical superiority, and the present invention is without scrap build or upgrading, thereby there is good operability and the market competitiveness.
The heating steel billet system of the each embodiment of table 1 and comparative example
Temperature, whole Zha Wendu and hot heading qualification rate are pricked in opening of table 2 rolling technology
Claims (3)
1. a rolling technology that improves 20Cr steel hot heading performance, comprises heating steel billet, de-scaling, rolling and cooling step; It is characterized in that:
The heating cycle of described heating steel billet step is: tapping temperature: 1080～1150 DEG C, soaking zone temperature: 1160～1210 DEG C, heating two district's temperature: 1170～1220 DEG C, heating one district's temperature: 1100～1150 DEG C, preheating temperature: 800～850 DEG C, soaking time: 40～60min, total heat-up time: >=120min;
The start rolling temperature of described rolling step is 1050～1120 DEG C, and finishing temperature is 850～950 DEG C.
2. the rolling technology of raising 20Cr steel hot heading performance according to claim 1, is characterized in that:
The heating cycle of described heating steel billet step is: tapping temperature: 1095～1140 DEG C, soaking zone temperature: 1185～1205 DEG C, heating two district's temperature: 1175～1210 DEG C, heating one district's temperature: 1125～1145 DEG C, preheating temperature: 800～835 DEG C, soaking time: 45～60min, total heat-up time: 120～145min.
3. the rolling technology of raising 20Cr steel hot heading performance according to claim 1 and 2, is characterized in that:
The start rolling temperature of described rolling step is 1075～1095 DEG C, and finishing temperature is 920～940 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102250.6A CN103882201A (en) | 2014-03-19 | 2014-03-19 | Rolling process capable of improving hot-upsetting performance of 20 Cr steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102250.6A CN103882201A (en) | 2014-03-19 | 2014-03-19 | Rolling process capable of improving hot-upsetting performance of 20 Cr steel |
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| CN103882201A true CN103882201A (en) | 2014-06-25 |
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| CN201410102250.6A Pending CN103882201A (en) | 2014-03-19 | 2014-03-19 | Rolling process capable of improving hot-upsetting performance of 20 Cr steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113319147A (en) * | 2021-05-13 | 2021-08-31 | 宝武杰富意特殊钢有限公司 | SY740 round bar with improved turning performance and preparation method thereof |
| CN114769315A (en) * | 2022-04-22 | 2022-07-22 | 江苏永钢集团有限公司 | Rolling process for improving surface quality of 20Cr steel bar hot-rolled round steel |
| CN115351071A (en) * | 2022-08-05 | 2022-11-18 | 新疆八一钢铁股份有限公司 | Rolling process for inhibiting medium and small bar high-quality special steel hot upset forging cracks |
| CN115415320A (en) * | 2022-08-31 | 2022-12-02 | 大冶特殊钢有限公司 | Rolling method of 20Cr steel |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04124217A (en) * | 1990-09-12 | 1992-04-24 | Toa Steel Co Ltd | Production of high strength gear steel excellent in softening property |
| JPH1017928A (en) * | 1996-06-28 | 1998-01-20 | Kawasaki Steel Corp | Production of gear steel stock for induction hardening, excellent in machinability and fatigue strength |
| 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 |
| CN1608758A (en) * | 2004-11-22 | 2005-04-27 | 宝钢集团上海五钢有限公司 | Hot continuous rolling process of high-sulfur (sulfur-phosphorus) free cutting structural steel |
| CN101144116A (en) * | 2007-11-13 | 2008-03-19 | 攀钢集团攀枝花钢铁研究院 | Casting blank heating method for controlling surface to generate ferric oxide structure |
| CN103192012A (en) * | 2013-04-25 | 2013-07-10 | 内蒙古包钢钢联股份有限公司 | Rolling production process of 20CrMnTi gear steel |
| CN103194580A (en) * | 2013-04-03 | 2013-07-10 | 武汉钢铁(集团)公司 | Rolling method of low-banded structure gear steel |
-
2014
- 2014-03-19 CN CN201410102250.6A patent/CN103882201A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04124217A (en) * | 1990-09-12 | 1992-04-24 | Toa Steel Co Ltd | Production of high strength gear steel excellent in softening property |
| JPH1017928A (en) * | 1996-06-28 | 1998-01-20 | Kawasaki Steel Corp | Production of gear steel stock for induction hardening, excellent in machinability and fatigue strength |
| 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 |
| CN1608758A (en) * | 2004-11-22 | 2005-04-27 | 宝钢集团上海五钢有限公司 | Hot continuous rolling process of high-sulfur (sulfur-phosphorus) free cutting structural steel |
| CN101144116A (en) * | 2007-11-13 | 2008-03-19 | 攀钢集团攀枝花钢铁研究院 | Casting blank heating method for controlling surface to generate ferric oxide structure |
| CN103194580A (en) * | 2013-04-03 | 2013-07-10 | 武汉钢铁(集团)公司 | Rolling method of low-banded structure gear steel |
| CN103192012A (en) * | 2013-04-25 | 2013-07-10 | 内蒙古包钢钢联股份有限公司 | Rolling production process of 20CrMnTi gear steel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113319147A (en) * | 2021-05-13 | 2021-08-31 | 宝武杰富意特殊钢有限公司 | SY740 round bar with improved turning performance and preparation method thereof |
| CN113319147B (en) * | 2021-05-13 | 2022-12-30 | 宝武杰富意特殊钢有限公司 | SY740 round bar with improved turning performance and preparation method thereof |
| CN114769315A (en) * | 2022-04-22 | 2022-07-22 | 江苏永钢集团有限公司 | Rolling process for improving surface quality of 20Cr steel bar hot-rolled round steel |
| CN115351071A (en) * | 2022-08-05 | 2022-11-18 | 新疆八一钢铁股份有限公司 | Rolling process for inhibiting medium and small bar high-quality special steel hot upset forging cracks |
| CN115415320A (en) * | 2022-08-31 | 2022-12-02 | 大冶特殊钢有限公司 | Rolling method of 20Cr steel |
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Application publication date: 20140625 |
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