CN101829889B - Production process of austenitic stainless steel bar by short-process continuous casting and rolling - Google Patents
Production process of austenitic stainless steel bar by short-process continuous casting and rolling Download PDFInfo
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- CN101829889B CN101829889B CN2010101646431A CN201010164643A CN101829889B CN 101829889 B CN101829889 B CN 101829889B CN 2010101646431 A CN2010101646431 A CN 2010101646431A CN 201010164643 A CN201010164643 A CN 201010164643A CN 101829889 B CN101829889 B CN 101829889B
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Abstract
The invention relates to a production process of an austenitic stainless steel bar by short-process continuous casting and rolling, which comprises processes of smelting, continuous casting, continuous rolling, centerless lathe processing, centerless grinder refining and flaw detection, encapsulation and delivery, wherein during continuous casting, the temperature of molten steel in a furnace is required to be controlled at 1550 to 1650 DEG C, the casting speed is controlled at 1.5 to 3 meters per minute, and the casting frequency is controlled at 80 to 120 times per minute; during smelting, the secondary argon blowing refining is performed for 3 to 5 minutes and then the temperature is increased to 1550 to 1650 DEG C before entering the next horizontal continuous casting process; and during continuous rolling, a semi-finished product with the diameter of 12 to 43 mm is finally formed and then online secondary water cooling solution treatment is performed; subsequently, centerless lathes are processed and the processed amount of the centerless lathes each time is controlled at 0.5 to 1 mm. Compared with the prior art, the invention has the following advantages of simplified production process, finally formed products, improved production efficiency of continuous casting and continuous rolling, shortened heating time due to online heat transfer, improved production environment, low energy consumption and production cost, good product quality, and the like.
Description
Technical field
The present invention relates to the production technology of a kind of stainless steel bar in metallurgical continuous casting and continuous rolling field, particularly a kind of production technology of lacking flow process continuous casting and rolling austenitic stainless steel bar.
Background technology
At present, for diameter of phi 11-Φ 42mm, diameter tolerance h8, surface roughness
The austenitic stainless steel bar material of length in the 2-3m scope, the traditional processing technology that the domestic medium-sized and small enterprises of China generally adopt is: electric arc furnaces+AOD argon oxygen stove is smelted (perhaps more low-grade township enterprise then directly adopts greater than the intermediate frequency furnace more than 3 tons and smelts), ingot casting (200 * 200mm), heat the five frame 8-14 passage coggings of Φ 630-Φ 700mm cross-arranging type blooming mill again and become 60 * 60mm-100 * 100mm square billet, heat Φ 250-Φ 300mm cross-arranging type five stand mill 10-16 passage again and be rolled into Φ 12-Φ 43mm bar semi-finished product, cold drawn, it is molten to add thermosetting again, the tumbling alignment, the centerless grinder corase grind, the centerless grinder correct grinding, flaw detection, finished product packing dispatches from the factory.Because this explained hereafter long flow path, production efficiency is low, heating process is many again, energy consumption is high, lumber recovery is low, production cost is high, and the production environment deterioration, unstable product quality.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art, and a kind of production technology of lacking the short flow process continuous casting and rolling austenitic stainless steel bar of flow process, high efficiency, low cost, constant product quality is provided.
Technical scheme of the present invention is: a kind of production technology of lacking flow process continuous casting and rolling austenitic stainless steel bar comprises following operation: smelting, continuous casting, tandem rolling, be not in the mood for machined into, centerless grinder correct grinding, the flaw detection packing is dispatched from the factory:
Smelt: austenitic stainless steel packing that will be qualified expects to pack in the intermediate frequency furnace, fusing, slag making, it is white to slag more than 1530 ℃ to heat up, ar blowing refining, slagging-off adds alloy and is tailored into part, get sample in the stove, after the spectrum analysis composition meets institute's steelmaking kind standard, be warming up to 1550-1650 ℃ and enter down road horizontal casting operation;
Continuous casting: confirm that horizontal caster a complete set of equipment works well, after the dummy ingot device rotates flexibly, open the casting throwing, in the production process, require to control well the interior liquid steel temperature of stove in 1550-1650 ℃ of scope, control well casting speed 1.5-3 rice/minute, frequency of billet withdrawal 80-120 time/minute;
Tandem rolling: will the side's of justifying Hot Charging of Continuous Casting Slab deliver to be warming up to 1100-1200 ℃ in the heat transmitting furnace of medium-frequency induction after, roller-way is delivered to axial rolling 4-10 passage in the three-roller Y shaped reducing mill, newly net forming is Φ 12-Φ 43mm semi-finished product; Perhaps roller-way is delivered to the high rigidity open-train mill three frame hot rolling 4-8 passages of Φ 250 short stress, and newly net forming is the semi-finished product of Φ 12-Φ 43mm;
Be not in the mood for machined into: by customer demand the Φ 12-Φ 43mm semi-finished product of fixed length 2-3 rice are sent into and be not in the mood for the lathe Milling Process;
Centerless grinder correct grinding: send into the centerless grinder correct grinding after will the semi-finished product tumbling alignment after not being in the mood for machined into and reach diameter of phi 11-Φ 42mm scope, diameter tolerance h8, surface roughness
Requirement;
The flaw detection packing is dispatched from the factory: will process the semi-finished product that reach required precision through centerless grinder and send into the nondestructive inspection of vortex flow defectoscope, after checking bar surface flawless defective, send into defectives such as the inner no shrinkage porosite of ultrasonic examination check bar, pinprick again, can pack warehouse-in wait delivery and dispatch from the factory.
The further technical scheme of the present invention is: during smelting, through behind 3-5 minute the secondary ar blowing refining, be warming up to 1550-1650 ℃ again and enter down road horizontal casting operation.
The further again technical scheme of the present invention is: during tandem rolling, axial rolling is carried out the solution treatment of online secondary water-cooled after becoming Φ 12-Φ 43mm semi-finished product, is not in the mood for machined into again.
The present invention further technical scheme is: be not in the mood for machined into processing capacity every time be controlled at 0.5-1mm.
The present invention compared with prior art has following beneficial effect:
1, production technology is simplified newly net forming;
2, continuous casting and rolling production efficiency improves;
3, online heat is sent, and reduces heat time heating time, and energy consumption is low;
4, improve production environment;
5, reduce production costs;
6, good quality of product.
Be Φ 30mm to produce diameter below, diameter tolerance
Length is that used for high-speed railway ground terminal (grade of steel is 0Cr18Ni12Mo2) the austenitic stainless steel bar material of 2.5m ± 0.05m is an example, and detailed content of the present invention is further described.
The specific embodiment
Embodiment one
A kind of production technology of lacking flow process continuous casting and rolling austenitic stainless steel bar comprises following six operations: smelting, continuous casting, tandem rolling, be not in the mood for machined into, centerless grinder correct grinding, the flaw detection packing is dispatched from the factory:
Smelt: will be through alkali cleaning, oil removing, oven dry, it is to melt in " circle side's horizontal casters of using " supporting mounted intermediate frequency furnace of ZL95219468.6 that (0Cr18Ni12Mo2) steel raw material that is packaged into 300 * 300mm is packed into the patent No. more, slag making, be warming up to more than 1530 ℃ white to slag, enabling the patent No. is " a kind of stainless steel continuous casting purifier " patented technology ar blowing refining of ZL96249589.1, time 5-10 minute, slagging-off adds alloy and is tailored into part, get sample in the stove, sample preparation is therefrom cut get glass sample with abrasive wheel cutting machine, polish with emery wheel again, the institute flat surface grinding is blown clean with compressed air, adopt the spectrum machine to test sample then: Cr allocates into by 17, spectrum is tested sample 〉=17%, less than the time to supply 17%; Ni allocates into by 12, and spectrum is tested sample 〉=12%, less than the time to supply 12%; Mo allocates into by 2.5, and spectrum is tested sample 〉=2.5%, less than the time supply 2.5%; C allocates into by 0.05%, and carbon sulphur quick analytic instrument is tested sample≤0.06%; Meet secondary ar blowing refining after the above-mentioned standard, time 3-5 minute, being warming up to 1550-1650 ℃ again changeed road horizontal casting operation under the preface;
Continuous casting: " realizing the dummy ingot device of many stoves continuous casting " patented technology of confirming to enable after " a kind of horizontal casting square billet eseparation ring " installation qualification and horizontal caster a complete set of equipment work well the patent No. and being ZL96218576.0 begins throwing, in the production process, requirement is controlled the interior liquid steel temperature of stove well in 1550-1650 ℃ of scope, casting speed control well in 1.5-3 rice/minute scope, and frequency of billet withdrawal is in 80-150 time/minute scope;
Tandem rolling: online directly with water under high pressure solid solution dephosphorization and through the visual examination surface quality do not have serious cracking, scab, after circle side's Hot Charging of Continuous Casting Slab qualified, fixed length 4.9m, specification 45mm of pipe delivers to and is warming up to 1100-1200 ℃ in the heat transmitting furnace of medium-frequency induction, roller-way is delivered to that axial rolling 4-10 passage is that Φ 31mm * 10.3m is long in the three-roller Y shaped reducing mill;
Be not in the mood for machined into: all four are the semi-finished product of 2.5m ± 0.03m with the long rod of 10.3m, send into not to be in the mood for machined into and to be
Semi-finished product, every time is controlled at 0.5-1mm processing capacity;
Centerless grinder correct grinding: after will the semi-finished product tumbling alignment after not being in the mood for machined into, send into the centerless grinder correct grinding and reach diameter of phi 11-Φ 32mm, diameter tolerance h8, rough surface
The semi-finished product that require;
The flaw detection packing is dispatched from the factory: will reach the semi-finished product of required precision through the centerless grinder correct grinding, send into the nondestructive inspection of vortex flow defectoscope, after the flawless defective of inspection bar surface, send into ultrasonic examination again, check defectives such as the inner no shrinkage porosite of bar, pinprick can pack warehouse-in wait delivery and dispatch from the factory.
Embodiment two
A kind of production technology of lacking flow process continuous casting and rolling austenitic stainless steel bar, when tandem rolling, online directly with water under high pressure solid solution dephosphorization and through the visual examination surface quality do not have serious cracking, scab, after circle side's Hot Charging of Continuous Casting Slab qualified, fixed length 5.2m, specification 45mm of pipe delivers to and is warming up to 1100-1200 ℃ in the heat transmitting furnace of medium-frequency induction, it is that Φ 32mm * 10.3m is long (because of the rolling semi-finished product dimensional accuracy of open-train mill is difficult to control, for guaranteeing that roller-way is delivered to the high rigidity open-train mill three frame hot rolling 4-8 passages of Φ 250 short stress
The finished product lumber recovery and intentionally the semi-finished product size is increased to Φ 32mm).All the other production technologies are identical with embodiment one.
Provided by the inventionly a kind ofly lack the flow process continuous casting and rolling and produce the production technology of Φ 11-Φ 42mm austenitic stainless steel bar material and have energy-efficient, high-quality advantage cheaply, the product of producing has the competitive advantage of the similar products at home and abroad led over.
Claims (5)
1. production technology of lacking flow process continuous casting and rolling austenitic stainless steel bar is characterized in that comprising following operation: smelting, continuous casting, tandem rolling, be not in the mood for machined into, centerless grinder correct grinding, flaw detection packing and dispatch from the factory;
Smelt: austenitic stainless steel packing that will be qualified expects to pack in the intermediate frequency furnace, fusing, slag making, it is white to slag more than 1530 ℃ to heat up, ar blowing refining, slagging-off adds alloy and is tailored into part, get sample in the stove, after the spectrum analysis composition meets institute's steelmaking kind standard, be warming up to 1550-1650 ℃ and enter down road horizontal casting operation;
Continuous casting: confirm that horizontal caster a complete set of equipment works well, after the dummy ingot device rotates flexibly, open the casting throwing, in the production process, require to control well the interior liquid steel temperature of stove in 1550-1650 ℃ of scope, control well casting speed 1.5-3 rice/minute, frequency of billet withdrawal 80-120 time/minute;
Tandem rolling: will the side's of justifying Hot Charging of Continuous Casting Slab deliver to be warming up to 1100-1200 ℃ in the heat transmitting furnace of medium-frequency induction after, roller-way is delivered to axial rolling 4-10 passage in the three-roller Y shaped reducing mill, newly net forming is Φ 12-Φ 43mm semi-finished product; Perhaps roller-way is delivered to the high rigidity open-train mill three frame hot rolling 4-8 passages of Φ 250 short stress, and newly net forming is the semi-finished product of Φ 12-Φ 43mm;
Be not in the mood for machined into: by customer demand the Φ 12-Φ 43mm semi-finished product of fixed length 2-3 rice are sent into and be not in the mood for the lathe Milling Process;
Centerless grinder correct grinding: send into the centerless grinder correct grinding after will the semi-finished product tumbling alignment after not being in the mood for machined into and reach diameter of phi 11-Φ 42mm scope, diameter tolerance h8, surface roughness
Requirement;
The flaw detection packing is dispatched from the factory: will process the semi-finished product that reach required precision through centerless grinder and send into the nondestructive inspection of vortex flow defectoscope, after checking bar surface flawless defective, send into the inner no shrinkage porosite of ultrasonic examination check bar, pinprick defective again, can pack warehouse-in wait delivery and dispatch from the factory.
2. the production technology of short flow process continuous casting and rolling austenitic stainless steel bar according to claim 1 when it is characterized in that smelting, meets secondary ar blowing refining after the standard, time 3-5 minute, is warming up to 1550-1650 ℃ again and enters down road horizontal casting operation.
3. the production technology of short flow process continuous casting and rolling austenitic stainless steel bar according to claim 1 and 2 when it is characterized in that tandem rolling, after newly net forming is the semi-finished product of Φ 12-Φ 43mm, is carried out the solution treatment of online secondary water-cooled, is not in the mood for machined into again.
4. the production technology of short flow process continuous casting and rolling austenitic stainless steel bar according to claim 1 and 2, it is characterized in that not being in the mood for machined into processing capacity every time be controlled at 0.5-1mm.
5. the production technology of short flow process continuous casting and rolling austenitic stainless steel bar according to claim 3, it is characterized in that not being in the mood for machined into processing capacity every time be controlled at 0.5-1mm.
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| CN106756626A (en) * | 2016-12-27 | 2017-05-31 | 广西钦州力创特种合金新材料有限公司 | A kind of food the contact bright as silver rod of free cutting austenite stainless steel and its production technology |
| CN112275797B (en) * | 2020-09-03 | 2023-04-07 | 太原钢铁(集团)有限公司 | Method for eliminating surface defects of super austenitic stainless steel middle plate |
| CN112813336A (en) * | 2021-01-28 | 2021-05-18 | 苏州金立鑫特材科技有限公司 | Method for processing SUS303 steel for automobile starting system |
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Effective date of registration: 20200601 Address after: 421007 Hunan city in Hengyang Province, Yanfeng district director Tang Baishazhou Industrial Road No. 2 Patentee after: HENGYANG JINZELI SPECIAL ALLOY Co.,Ltd. Address before: 421007 Hunan province Hengyang City Baishazhou Yanfeng District No. 1 Patentee before: Zhong Changlin |
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