CN103949474A - Skew rolling lubrication method for thin-walled austenitic stainless steel seamless steel tube - Google Patents
Skew rolling lubrication method for thin-walled austenitic stainless steel seamless steel tube Download PDFInfo
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- CN103949474A CN103949474A CN201410177649.0A CN201410177649A CN103949474A CN 103949474 A CN103949474 A CN 103949474A CN 201410177649 A CN201410177649 A CN 201410177649A CN 103949474 A CN103949474 A CN 103949474A
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Abstract
The invention discloses a skew rolling lubrication method for a thin-walled austenitic stainless steel seamless steel tube. The working surface of a guide disc of a skew tube rolling mill is coated with lithium-base lubricating grease. After the guide disc of the skew tube rolling mill is lubricated by using the method, the rate of finished products is increased, so that an ACCU ROLL skew tube rolling mill can be better adopted for hot rolling, punching and rolling, the production cost can be greatly reduced, complicated processes such as cold rolling and cold drawing are eliminated, the thin-walled austenitic stainless steel seamless steel tube can be directly produced on a skew rolling production process line, the problem of increase of rejection rate caused by adhesion of steel to the guide disc of the ACCU ROLL skew tube rolling mill in an existing hot rolling technology for the thin-walled austenitic stainless steel seamless steel tube is solved, and a new choice is provided for production of the thin-walled austenitic stainless steel seamless steel tube.
Description
Technical field
The invention belongs to field of metallurgy, specifically, a kind of bacterium formula lubricated method of boring a hole while the present invention relates to thin-walled austenite stainless steel seamless steel tube oblique milling.
Background technology
Austenitic stainless steel pipe is widely used in the industry such as boiler, generating, oil, chemical industry, synthetic fibers, food and papermaking.
Produce thin-walled austenite seamless steel pipe and generally adopt after circular pipe blank hot piercing the cold rolling or cold-drawing technology of multi-pass.Yet, limited because of every time deflection, often need the cold rolling or cold-drawn of multi-pass just can make thin-walled austenite seamless steel pipe.Every time cold rolling production process comprises: check steel pipe → crop, cut-out → annealing heat treatment → bundling → pickling → cleaning → flushing → neutralization → oven dry → inspection → reconditioning → lubricated → cold rolling; The production process of every time cold-drawn comprises: check steel pipe → reconditioning → cut-out → tup → annealing heat treatment → bundling → pickling → cleaning → flushing → neutralization → phosphatization, oxalates processing or copper facing → cleaning → oven dry → saponification → drawing.
As can be seen here, the cold working complex procedures of existing austenite seamless steel pipe, and exist cost high, yield poorly and the problem such as pickling contaminated environment.If adopt the hot rolling of ACCU ROLL diagonal rolling pipe mill directly to produce thin-walled austenite stainless steel seamless steel tube, will greatly reduce production costs.But when the ratio of 159～273 millimeters of scopes of oblique milling external diameter, external diameter and wall thickness is greater than 20 austenite stainless steel seamless steel tube, two very easily steel bondings of godet of ACCU ROLL diagonal rolling pipe mill, and the steel of adhering on godet scabs and can scratch steel tube surface, cause steel pipe to be scrapped.
Summary of the invention
For deficiency of the prior art, the object of the invention is to one or more in solving the problems of the technologies described above.
The object of the present invention is to provide the lubricated method of a kind of austenite stainless steel seamless steel tube oblique milling, reach the object that prevents godet steel bonding and improve yield rate.
To achieve these goals, the invention provides a kind of lubricated method of thin-walled austenite stainless steel seamless steel tube oblique milling, on the godet working face of diagonal rolling pipe mill, smear lithium base grease.
According to an embodiment of the lubricated method of thin-walled austenite stainless steel seamless steel tube of the present invention oblique milling, by weight percentage, described lithium base grease contains 6～30% lead oxide and 70～94% lithium saponify.
According to an embodiment of the lubricated method of thin-walled austenite stainless steel seamless steel tube of the present invention oblique milling, the external diameter of described thin-walled austenite stainless steel seamless steel tube is that 159～273mm and external diameter are greater than 20 with the ratio of wall thickness.
According to an embodiment of the lubricated method of thin-walled austenite stainless steel seamless steel tube of the present invention oblique milling, described diagonal rolling pipe mill is ACCU ROLL diagonal rolling pipe mill.
After adopting method of the present invention to be lubricated the godet of diagonal rolling pipe mill, improved yield rate, thereby can adopt preferably the hot rolling of ACCU ROLL diagonal rolling pipe mill to bore a hole, rolling, not only can greatly reduce production costs, but also cancelled cold rolling, the complicated procedures of forming such as cold-drawn, thereby can on an oblique milling line of production technology, directly produce thin-walled austenite stainless steel seamless steel tube, the problem that has solved the easy steel bonding of ACCU ROLL diagonal rolling pipe mill godet in the technology of existing hot rolling thin-walled austenitic stainless steel seamless steel pipe and caused waste product to increase, for the production of thin-walled austenite stainless steel seamless steel tube provides a kind of new selection.
The specific embodiment
Hereinafter, the lubricated method of thin-walled austenite stainless steel seamless steel tube oblique milling of the present invention will be described in detail.
The present invention adopts ACCU ROLL diagonal rolling pipe mill to carry out the rolling of thin-walled austenite stainless steel seamless steel tube, particularly, the plug that two tapered rolls that ACCU ROLL diagonal rolling pipe mill is arranged by left and right, upper and lower vertically arranged two godets and axis overlap with roll line forms totally enclosed pass.Wherein, the tapered design of roll makes the peripheral speed of roll surface and constantly increases from the inlet to the outlet along the component velocity of roll line, is conducive to steel pipe extensional; Because the body of roll of roll is designed with longer expansion finish rolling section, regrate coefficient can reach more than 5, and thickness of steel pipe precision is in 10%; The plug that adopts restraint, steel pipe length can reach 16 meters.Compare with tandem rolling, the oblique milling of ACCU ROLL diagonal rolling pipe mill longitudinally, lateral performance difference is less.Concrete structure and the working method of ACCU ROLL diagonal rolling pipe mill are prior art, and therefore not to repeat here.
Said structure based on ACCU ROLL diagonal rolling pipe mill and production feature, adopt ACCUROLL diagonal rolling pipe mill oblique milling austenite stainless steel seamless steel tube can reach higher wall thickness dimension precision just.But be 1.5 times of carbon steel and the feature such as high-temp plastic is poor owing to thering is easy steel bonding, spreading such as austenitic stainless steels such as TP304, when to adopt ACCU ROLL diagonal rolling pipe mill oblique milling external diameter be 159～273mm, external diameter while being greater than 20 austenite stainless steel seamless steel tube with the ratio of wall thickness, two very easily steel bondings of godet of ACCU ROLL diagonal rolling pipe mill, and the steel of adhering on godet scabs and can scratch steel tube surface, cause steel pipe to be scrapped.Therefore, take suitable godet lubricant method to be successfully that rolling is such as the key of the austenite stainless steel seamless steel tubes such as TP304.
The lubricated method of thin-walled austenite stainless steel seamless steel tube of the present invention oblique milling is smeared lithium base grease and is reached the object that godet is lubricated on the godet working face of diagonal rolling pipe mill, is rolled afterwards the appearance that can avoid godet steel bonding phenomenon again.
Particularly, by weight percentage, above-mentioned lithium base grease contains 6～30% lead oxide and 70～94% lithium saponify.After lead oxide and lithium saponify fully mix, lithium saponify can be as the decentralized medium of lead oxide, and before tube rolling, the temperature of godet is between 50～200 ℃, at this temperature range inner lithium grease, there is good viscosity, and lead oxide can rely on lithium saponify to adhere to godet surface; When tube rolling, when godet contacts with steel pipe, its temperature sharply raises, the lithium saponify volatilization of being heated, and lead oxide more than 400 ℃ can also be attached to the surface of stainless steel tube and play effect lubricated, isolation, thus continue to prevent the adhesion of stainless steel tube and godet.
The present invention is particularly useful for external diameter, and to be 159～273mm and external diameter be greater than the production of 20 thin-walled austenite stainless steel seamless steel tube with the ratio of wall thickness, and the diagonal rolling pipe mill adopting is ACCU ROLL diagonal rolling pipe mill, but the invention is not restricted to steel pipe and the diagonal rolling pipe mill of above-mentioned specification.
Below by concrete example, describe the present invention in detail, but and limit the scope of the invention never in any form.
Example 1:
Seamless according to ASTM SA-312 standard < < is the TP304 austenite stainless steel seamless steel tube of Φ 168 * 8 with welding austenitic stainless nominal tube > > production specification.
The technological process of production adopting is: electric furnace smelting adds the tube rolling → sizing → aligning → inspection of round base → annular furnace heating → roll piercing → ACCU ROLL diagonal rolling pipe mill, the packing of external refining → forging Φ 200.
Wherein, the soaking zone furnace temperature of annular furnace is 1150 ℃, bores a hole as the hollow billet of Φ 217 * 14; The godet working face of ACCUROLL diagonal rolling pipe mill is coated the lithium base grease being comprised of the lead oxide powder of 10wt% and the lithium saponify of 90wt%, is rolled into the hollow forging of Φ 206 * 8; Through five frame two roller sizing mill sizings, become the fished pipe of Φ 168 * 8.
The chemical composition of the prepared TP304 austenite stainless of this example steel seamless steel tube is as shown in table 1, and the external diameter tolerance of this TP304 austenite stainless steel seamless steel tube can reach D ± 0.5%, and wall thickness tolerance can reach 0～+ 10%.
The chemical composition (wt%) of table 1 example 1 gained TP304 austenite stainless steel seamless steel tube
| C | Si | Mn | P | S | Cr | Ni | Cu | Al |
| 0.06 | 0.35 | 1.53 | 0.029 | 0.009 | 18.4 | 8.41 | 0.013 | 0.12 |
Example 2:
Seamless according to ASTM SA-312 standard < < is the TP316L austenite stainless steel seamless steel tube of Φ 219 * 10 with welding austenitic stainless nominal tube > > production specification.
The technological process of production adopting is: electric furnace smelting adds the tube rolling → sizing → aligning → inspection of round base → annular furnace heating → roll piercing → ACCU ROLL diagonal rolling pipe mill, the packing of external refining → forging Φ 220.
Wherein, annular furnace soaking zone furnace temperature is 1140 ℃, bores a hole as the hollow billet of Φ 248 * 13.5; The godet working face of ACCUROLL diagonal rolling pipe mill is coated the lithium base grease being comprised of the lead oxide powder of 27wt% and the lithium saponify of 73wt%, is rolled into the hollow forging of Φ 238 * 9.7; Through five frame two roller sizing mill sizings, become the fished pipe of Φ 219 * 10.
The external diameter tolerance of the prepared TP316L austenite stainless of this example steel seamless steel tube can reach D ± 0.5%, and wall thickness tolerance can reach 0～+ 10%.
Example 3:
Seamless according to ASTM SA-312 standard < < is the TP347H austenite stainless steel seamless steel tube of Φ 180 * 8.5 with welding austenitic stainless nominal tube > > production specification.
The technological process of production adopting is: electric furnace smelting adds the tube rolling → sizing → aligning → inspection of round base → annular furnace heating → roll piercing → ACCU ROLL diagonal rolling pipe mill, the packing of external refining → forging Φ 200.
Wherein, annular furnace soaking zone furnace temperature is 1140 ℃, bores a hole as the hollow billet of Φ 216 * 13.5; The godet working face of ACCUROLL diagonal rolling pipe mill is coated the lithium base grease being comprised of the lead oxide powder of 18wt% and the lithium saponify of 88wt%, is rolled into the hollow forging of Φ 206 * 8.5; Through five frame two roller sizing mill sizings, become the fished pipe of Φ 180 * 8.5.
The external diameter tolerance of the prepared TP316L austenite stainless of this example steel seamless steel tube can reach D ± 0.5%, and wall thickness tolerance can reach 0～+ 10%.
To sum up, if do not adopt lubricating method of the present invention, when rolling stainless steel tube, there will be serious godet steel bonding problem, often roll an arm and will spend 0.5～0.6 hour and carry out reconditioning, cannot realize normal production.Adopt after lubricating method of the present invention, can bore a hole at the hot rolling unit that comprises diagonal rolling pipe mill, oblique milling, sizing, thereby on a line of production technology, directly produce high-precision thin-walled austenite stainless steel seamless steel tube, solved the easy steel bonding of oblique milling milling train godet and the low problem of yield rate in prior art.
Although above by having described the present invention in conjunction with exemplary embodiment, it will be apparent to those skilled in the art that in the situation that do not depart from the spirit and scope that claim limits, can carry out various modifications and change to exemplary embodiment of the present invention.
Claims (4)
1. the lubricated method of thin-walled austenite stainless steel seamless steel tube oblique milling, is characterized in that, on the godet working face of diagonal rolling pipe mill, smears lithium base grease.
2. the lubricated method of thin-walled austenite stainless steel seamless steel tube oblique milling according to claim 1, is characterized in that, by weight percentage, described lithium base grease contains 6～30% lead oxide and 70～94% lithium saponify.
3. the lubricated method of thin-walled austenite stainless steel seamless steel tube oblique milling according to claim 1, is characterized in that, the external diameter of described thin-walled austenite stainless steel seamless steel tube is that 159～273mm and external diameter are greater than 20 with the ratio of wall thickness.
4. the lubricated method of thin-walled austenite stainless steel seamless steel tube oblique milling according to claim 1, is characterized in that, described diagonal rolling pipe mill is ACCU ROLL diagonal rolling pipe mill.
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| CN201410177649.0A CN103949474A (en) | 2014-04-29 | 2014-04-29 | Skew rolling lubrication method for thin-walled austenitic stainless steel seamless steel tube |
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| CN201410177649.0A CN103949474A (en) | 2014-04-29 | 2014-04-29 | Skew rolling lubrication method for thin-walled austenitic stainless steel seamless steel tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889163A (en) * | 2015-06-17 | 2015-09-09 | 攀钢集团成都钢钒有限公司 | Pure titanium seamless pipe cross rolling piercing method |
Citations (5)
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| JPH04178204A (en) * | 1990-11-09 | 1992-06-25 | Kawasaki Steel Corp | Plug mill rolling method for austenitic stainless steel |
| JPH0699206A (en) * | 1992-09-21 | 1994-04-12 | Kawasaki Steel Corp | Inclining rolling method for seamless steel tube |
| CN1809430A (en) * | 2003-06-23 | 2006-07-26 | 住友金属工业株式会社 | Tube stock for manufacturing seamless steel tube and method of manufacturing the same |
| CN101327492A (en) * | 2008-07-30 | 2008-12-24 | 郝建庚 | Process and system for manufacturing hot-rolled seamless tube |
| CN101824564A (en) * | 2009-06-03 | 2010-09-08 | 东港市东方高新金属材料有限公司 | Titanium alloy TC4 cold-rolled tube and production method thereof |
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2014
- 2014-04-29 CN CN201410177649.0A patent/CN103949474A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04178204A (en) * | 1990-11-09 | 1992-06-25 | Kawasaki Steel Corp | Plug mill rolling method for austenitic stainless steel |
| JPH0699206A (en) * | 1992-09-21 | 1994-04-12 | Kawasaki Steel Corp | Inclining rolling method for seamless steel tube |
| CN1809430A (en) * | 2003-06-23 | 2006-07-26 | 住友金属工业株式会社 | Tube stock for manufacturing seamless steel tube and method of manufacturing the same |
| CN101327492A (en) * | 2008-07-30 | 2008-12-24 | 郝建庚 | Process and system for manufacturing hot-rolled seamless tube |
| CN101824564A (en) * | 2009-06-03 | 2010-09-08 | 东港市东方高新金属材料有限公司 | Titanium alloy TC4 cold-rolled tube and production method thereof |
Non-Patent Citations (2)
| Title |
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| 余望等: "Accu Roll钢管热轧机导盘工艺润滑油的试验", 《特殊钢》, no. 03, 31 March 1994 (1994-03-31) * |
| 谢凤等: "金属氧化物在润滑脂中的极压抗磨性能研究", 《润滑与密封》, no. 02, 28 February 2009 (2009-02-28) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104889163A (en) * | 2015-06-17 | 2015-09-09 | 攀钢集团成都钢钒有限公司 | Pure titanium seamless pipe cross rolling piercing method |
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Application publication date: 20140730 |