CN102978363A - Method for preparing duplex stainless steel special pipe for hydraulic cylinder - Google Patents
Method for preparing duplex stainless steel special pipe for hydraulic cylinder Download PDFInfo
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- CN102978363A CN102978363A CN2012105315579A CN201210531557A CN102978363A CN 102978363 A CN102978363 A CN 102978363A CN 2012105315579 A CN2012105315579 A CN 2012105315579A CN 201210531557 A CN201210531557 A CN 201210531557A CN 102978363 A CN102978363 A CN 102978363A
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Abstract
The invention relates to a method for preparing a duplex stainless steel special pipe for a hydraulic cylinder, comprising the following ordinal steps of: I, billet preparation: employing a forging billet having the diameter phi of 210-450 mm and having a central through hole; II, heating: preheating in an annular furnace at the temperature of 700+/-10 DEG C, wherein the time of staying in the furnace is 3-6 hours; III, primary induction heating, wherein the heating temperature is 1180+/-10 DEG C and the heat preservation time is 1-3 minutes; IV, broaching: employing an expanding bit having the diameter phi of 95-250 mm so that the inner diameter after broaching is changed into phi 95-235 mm, wherein the spreading coefficient is 1.1-1.45; V, secondary induction heating, wherein the heating temperature is 1080+/-10 DEG C and the heat preservation time is 3-10 minutes; and VI, solid solution, directly dissolving in water after the secondary induction and completing the solid solution process in 25 seconds. The pipe prepared by the method is high in structure performance uniformity and yield.
Description
Technical field
The present invention relates to a kind of hydraulic ram with the manufacture method of duplex stainless steel special section tubular product, specifically is the manufacture method that a kind of hydraulic ram is used square-outside and round-inside duplex stainless steel special section tubular product.
Background technology
Duplex stainless steel is that the embrittlement tendency that the excellent in toughness of austenitic stainless steel, lower hot cracking tendency and good welding property and the higher-strength of ferritic stainless steel, anti-chloride stress cracking corrosive nature and postwelding is lower combines.Duplex stainless steel is taken into account the advantage of austenitic stainless steel and ferritic stainless steel, has very widely at chemical field and uses.
The two-phase stainless hardness of steel is high, machinability is difficult than austenitic stainless steel, so the production difficulty of dual phase steel steel tubing in different shapes is very large, and existing hydraulic ram is mainly finished production by machining after the bar solid solution with the manufacture method of duplex stainless steel special section tubular product.The structure property of bar is directly determining the structure property of special-shaped oil cylinder.The production of common domestic bar has the footpath to forge and fast forging mode, after blank specification＞200mm, there are difference in core structure and extexine homogeneity of structure, for the manufacture of square-outside and round-inside duplex stainless steel special section tubular product, lumber recovery is low, and the work-ing life of the oil cylinder of manufacturing is short.
Summary of the invention
Use the above-mentioned deficiency of the manufacturing process of dual phase steel special section tubular product in order to overcome existing hydraulic ram, the higher hydraulic ram of structure property homogeneity, the lumber recovery manufacture method of duplex stainless steel special section tubular product that the invention provides a kind of steel pipe.
This hydraulic ram comprises following step successively with the manufacture method of duplex stainless steel special section tubular product:
IBlank is prepared
Adopt the forging blank of Φ 210～450mm, central through hole Φ 40～120mm;
IIHeating
Blank is preheating in ring furnace, and the ring furnace preheating temperature arranges; 700 ± 10 ℃, the 3～6h of time in the stove;
IIIAn induction heating
1180 ± 10 ℃ of induction targets temperature, soaking time 1～3min, heating power 600～650KW, insulation power ≯ 200KW.
IVReaming
The rose bit of Φ 95～250mm is adopted in reaming, and internal diameter becomes Φ 95～235mm after the reaming, and expanding and prolonging coefficient is 1.1～1.45
Enter the secondary induction furnace after the reaming.
VThe secondary induction heating
1080 ± 10 ℃ of secondary induction targets temperature, soaking time 3～10min, heating power 600～650KW, insulation power ≯ 200KW.
VISolid solution
Directly entry solid solution after the secondary induction, this process is finished in 25s.
Detect physical and chemical index after the solid solution and satisfy national standard and ASME code requirement fully.
VIIMachining
Finish machining dimension with machining apparatus.
Specification is the long cylinder of square-outside and round-inside: the value of roughness is not more than R in the long cylinder
a0.8 μ m, the outside is square, and the value of outer surface roughness is not more than R
a3.2 μ m.
The present invention has adopted ring furnace preheating (600～710 ℃ of preheating temperatures)+induction heating (1170 ~ 1190 ℃ of induction heating temperatures)+reaming (coefficient 1.1 ~ 1.45 is prolonged in expansion)+secondary induction heating (1070 ~ 1090 ℃ of induction heating temperatures)+solid solution+mach mode of production, guaranteed the structure property homogeneity of steel pipe, this kind mode of production has improved the lumber recovery of seamless tube simultaneously.
Manufacture method of the present invention has been avoided separating out of duplex stainless steel σ phase; Solved the large problem of induction heating blank internal-external temperature difference, guaranteed that enough hot-work is interval; The solid solution of secondary induction heating has guaranteed that the high temperature recrystallize is complete, the homogeneous microstructure refinement; This product structure property satisfies national standard and ASME code requirement fully.This abnormity dual phase steel oil cylinder mainly is on active service in sea water desalting equipment, and prospect is very extensive.
The implementation case
Relate to detailed description the specific embodiment of the present invention below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment
The present embodiment manufacturing be domestic corporation to the requirement of duplex stainless steel hydraulic ram:
Material: S32205;
Specification is the long cylinder of square-outside and round-inside: interior diameter 105
+ 0.054Mm, the value of roughness is R
a0.8 μ m, the outside is square, the length 140mm on square every limit, and the value of roughness is R
a3.2 μ m, tube length 750 mm.Worker's method of present embodiment comprises following step successively:
IBlank is prepared
Adopt the forging blank of Φ 219mm, central through hole Φ 40mm;
IIHeating
700 ℃ of ring furnace preheating temperatures, the 3h of time in the stove;
IIIAn induction heating
1180 ℃ of induction targets temperature, soaking time 1min, heating power 600～650KW, insulation power ≯ 200KW.
IVReaming
The rose bit of Φ 95mm is adopted in reaming, and internal diameter becomes 95mm after the reaming, and expanding and prolonging coefficient is 1.15.
Enter the secondary induction furnace after the reaming.
VThe secondary induction heating
1080 ℃ of secondary induction targets temperature, soaking time 10min, heating power 600～650KW, insulation power ≯ 200KW.
VISolid solution
Directly entry solid solution after the secondary induction, this process should be finished in 25s.
Detect physical and chemical index after the solid solution and satisfy national standard and ASME code requirement fully.
VIIMachining
Finish machining dimension with machining apparatus, satisfy following requirement:
Specification is the long cylinder of square-outside and round-inside: interior diameter 105
+ 0.054Mm, the value of roughness is R
a0.8 μ m, the outside is square, the length 140mm on square every limit, and the value of roughness is R
a3.2 μ m, tube length 750 mm.
Claims (2)
1. a hydraulic ram is with the manufacture method of duplex stainless steel special section tubular product, and it comprises following step successively:
IBlank is prepared
Adopt the forging blank of Φ 210～450mm, central through hole Φ 40～120mm;
IIHeating
Blank is preheating in ring furnace, and the ring furnace preheating temperature arranges; 700 ± 10 ℃, the 3～6h of time in the stove;
IIIAn induction heating
1180 ± 10 ℃ of induction targets temperature, soaking time 1～3min;
IVReaming
The rose bit of Φ 95～250mm is adopted in reaming, and internal diameter becomes Φ 95～235mm after the reaming, and expanding and prolonging coefficient is 1.1～1.45; Enter the secondary induction furnace after the reaming;
VThe secondary induction heating
1080 ± 10 ℃ of secondary induction targets temperature, soaking time 3～10min;
VISolid solution
Directly entry solid solution after the secondary induction, the solid solution process is finished in 25s.
2. hydraulic ram according to claim 1 is characterized in that: in step with the manufacture method of duplex stainless steel special section tubular product
VIAfter the solid solution, carry out machining, be processed into the long cylinder of inner circle foreign side: the value of roughness is not more than R in the long cylinder
a0.8 μ m,, the value of outer surface roughness is not more than R
a3.2 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105315579A CN102978363A (en) | 2012-12-12 | 2012-12-12 | Method for preparing duplex stainless steel special pipe for hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105315579A CN102978363A (en) | 2012-12-12 | 2012-12-12 | Method for preparing duplex stainless steel special pipe for hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102978363A true CN102978363A (en) | 2013-03-20 |
Family
ID=47852697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105315579A Pending CN102978363A (en) | 2012-12-12 | 2012-12-12 | Method for preparing duplex stainless steel special pipe for hydraulic cylinder |
Country Status (1)
| Country | Link |
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| CN (1) | CN102978363A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103243213A (en) * | 2013-04-26 | 2013-08-14 | 山西太钢不锈钢股份有限公司 | Method for preventing super duplex stainless steel seamless tube from hole reaming cracking before extrusion |
| CN103599957A (en) * | 2013-11-18 | 2014-02-26 | 山西太钢不锈钢股份有限公司 | Extruding molding method of austenitic stainless steel seamless pipe for hydrogenation cracking furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101091984A (en) * | 2007-08-03 | 2007-12-26 | 攀钢集团攀枝花钢铁研究院 | Method for manufacturing stainless steel pipe |
-
2012
- 2012-12-12 CN CN2012105315579A patent/CN102978363A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101091984A (en) * | 2007-08-03 | 2007-12-26 | 攀钢集团攀枝花钢铁研究院 | Method for manufacturing stainless steel pipe |
Non-Patent Citations (3)
| Title |
|---|
| 《重庆大学学报》 19940731 张德一等 挤压不锈钢管内表面的"桔皮"状缺陷的成因分析 第111-113页 1生产挤压不锈钢管的工艺及变性原理，2"桔皮"状缺陷成因研究 1-2 第17卷, 第4期 * |
| 张德一等: "挤压不锈钢管内表面的"桔皮"状缺陷的成因分析", 《重庆大学学报》, vol. 17, no. 4, 31 July 1994 (1994-07-31) * |
| 王灿等: "一种新型不锈钢无缝管热挤压工艺设备", 《金属世界》, no. 3, 31 March 2012 (2012-03-31), pages 66 - 67 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103243213A (en) * | 2013-04-26 | 2013-08-14 | 山西太钢不锈钢股份有限公司 | Method for preventing super duplex stainless steel seamless tube from hole reaming cracking before extrusion |
| CN103599957A (en) * | 2013-11-18 | 2014-02-26 | 山西太钢不锈钢股份有限公司 | Extruding molding method of austenitic stainless steel seamless pipe for hydrogenation cracking furnace |
| CN103599957B (en) * | 2013-11-18 | 2016-03-30 | 山西太钢不锈钢股份有限公司 | A kind of extrusion process of hydrocracking stove austenitic stainless steel seamless pipe |
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Application publication date: 20130320 |