CN103736732A - Machining method of cogging extrusion of large diameter steel pipe - Google Patents
Machining method of cogging extrusion of large diameter steel pipe Download PDFInfo
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- CN103736732A CN103736732A CN201310731441.4A CN201310731441A CN103736732A CN 103736732 A CN103736732 A CN 103736732A CN 201310731441 A CN201310731441 A CN 201310731441A CN 103736732 A CN103736732 A CN 103736732A
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Abstract
The invention relates to a machining method of cogging extrusion of a large diameter steel pipe and belongs to the field of the extrusion process. The perforation ratio of P91 or P92 materials is not more than 1.35 in the perforation and blank production process. When the perforation ratio is more than 1.35, the process of the cogging extrusion which comprises the primary cogging and the secondary extrusion is adopted, namely that the transformation between large die series and small die series is adopted, and accordingly the perforation ratio is reduced, the tensile stress which is applied on the metal surface is reduced, and the surface ring crack of perforated blanks is prevented.
Description
Technical field:
The processing method that the present invention relates to a kind of cogging extruding large aperture steel pipe, belongs to extrusion process field.
Background technology:
P91, P92 steel belong to ferritic stainless steel, alloy content is high, there is more excellent comprehensive mechanical property, be widely used in subcritical, overcritical, ultra supercritical high temperature superheater, high temperature steam pipeline, be also used as nuclear heat exchanger and cracking of oil device boiler tube.Its main production method is: cutting steel ingot rising head, and---------finishing blank---------------machine adds, and deliver for a check in physics and chemistry test in heat treatment in extruding in heating by---Non-Destructive Testing---for jumping-up, perforation base in heating.
Along with P91, P92 large aperture (internal diameter is generally greater than 700mm) light-wall pipe are on the increase, in preforming, find, when penetration hole diameter is larger, piercing ratio reaches 1.35 o'clock (piercing ratio D
2/ (D
2-d
2)), D: jumping-up cylinder diameter, d: pecker diameter), the middle and lower part of P91, P92 perforation blank will produce a large amount of transversal cracks, and the degree of depth is generally shown in Fig. 1 at 20～50mm(), directly cause scrapping of blank.The main cause that causes perforation blank to crack is: in perforation procedure, metal is reverse flow, and blank is " growing tall " constantly, and tension is born on its surface.Due to P91, P92 steel alloy content is high, plasticity is poor, when penetration hole diameter is larger, piercing ratio reaches certain value, the tension that metal bears reverse flow surpasses the plasticity of itself, causes blank middle and lower part to produce ring crack.
Summary of the invention:
The object of the present invention is to provide the production method of a kind of cogging extruding large aperture steel pipe, the method can solve and in base process, because piercing ratio is excessive, produce blank ring crack, the problem that causes steel ingot to scrap.
Technical solution:
The present invention be P91 or P92 material in perforation preforming, piercing ratio D
2/ (D
2-d
2)≤1.35.
Further: when piercing ratio >=be greater than 1.35, to adopt " base-mono-time cogging-secondary extrusion " method, in a high grade series, carry out base and a cogging, in existing series, carry out secondary extrusion.
Further: base-mono-time cogging adopts 1500 serial dies, in secondary extrusion, adopt 1100 or 1300 serial dies.
The present invention adopts the technology mode of " a cogging-secondary extrusion " (cogging extruding) to produce, by adopting the conversion between large and small mould series, reduce piercing ratio, reduced the tension that bear metal surface, prevented that perforation blank from producing surperficial ring crack.
Accompanying drawing explanation
Fig. 1 is the blank surface quality condition figure without cogging extruding;
Fig. 2 is the blank surface quality condition figure of the present invention after cogging extruding.
The specific embodiment
Take certain contract material P92, specification φ 813/ φ 749mm, length >=6000mm is example:
Former process:
In 1300 serial dies, produce.The φ 755mm that bores a hole on 150MN base press, piercing ratio is 1300 * 1300/(1300 * 1300-755 * 755)=1.51, then adopt 360MN extruder, push the steel pipe into φ 860/ φ 735mm.This technique causes 3 blanks to be scrapped, and 5 extruded tubes are because of the short chi delivery of defect.
Extruding flow process is:
1) in 1300 serial middle punches 755
2) in 1300 series, push 860/735
The inventive method:
In 1500 serial die coggings.The 770mm that bores a hole on 150MN base press carries out base, and piercing ratio is 1550 * 1550/(1550 * 1550-770 * 770)=1.33; Then adopt 360MN extruder, still adopt 1500 serial dies, push the pipe into φ 1300/ φ 750.This pipe, as extrusion billet (see figure 2), in 1300 mould series, adopts 360MN extruder, pushes the steel pipe into φ 860/ φ 735mm.
Extruding flow process is:
Cutting steel ingot rising head---heating---jumping-up, perforation base (1500 serial dies, using specification is that 770 pecker is bored a hole)---finishing blank---extruded stock (1500 serial dies, using specification is that extrusion die/plug of 1300/750 pushes)------------machine adds, and---Non-Destructive Testing---delivers for a check in physics and chemistry test in heat treatment in finishing extrusion billet---heating---extruding (1300 serial dies, use specification is that extrusion die/plug of 860/735 pushes).
3, effect
Steel Tube Special branch company of Bei Chong group produces 5000, seamless steel pipe per year, and wherein P91, P92 steel pipe account for 50%, and large aperture steel pipe accounts for 30% of P91, P92 total amount
Before the production method of a kind of cogging extruding large aperture steel pipe does not adopt, large aperture P91, P92 steel pipe because of the surface of blank have a large amount of transversal cracks and serious ring crack and extrusion blank tube-surface have a large amount of pipes and folding cause that production tube scraps account for 20%, caused huge economic loss.
After the production method of a kind of cogging extruding large aperture steel pipe adopts, the steel pipe that adopts the production method production of cogging extruding large aperture steel pipe, blank surface is up-to-standard, without ring crack phenomenon, extruding steel tube surface quality is qualified, has guaranteed the requirement delivery that every steel pipe can be as agreed.
Claims (3)
1. a processing method for cogging extruding large aperture steel pipe, is characterized in that, P91 or P92 material in perforation preforming, piercing ratio D
2/ (D
2-d
2)≤1.35.
2. the processing method that large aperture steel pipe is pushed in a kind of cogging according to claim 1, it is characterized in that, when piercing ratio >=be greater than 1.35, " base-mono-time cogging-secondary extrusion " method of employing, in a high grade series, carry out base and a cogging, in existing series, carry out secondary extrusion.
3. the processing method of a kind of cogging extruding according to claim 2 large aperture steel pipe, is characterized in that, base-mono-time cogging adopts 1500 serial dies, in secondary extrusion, adopts 1100 or 1300 serial dies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310731441.4A CN103736732A (en) | 2013-12-26 | 2013-12-26 | Machining method of cogging extrusion of large diameter steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310731441.4A CN103736732A (en) | 2013-12-26 | 2013-12-26 | Machining method of cogging extrusion of large diameter steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103736732A true CN103736732A (en) | 2014-04-23 |
Family
ID=50493839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310731441.4A Pending CN103736732A (en) | 2013-12-26 | 2013-12-26 | Machining method of cogging extrusion of large diameter steel pipe |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607467A (en) * | 2014-12-27 | 2015-05-13 | 内蒙古北方重工业集团有限公司 | Large-bore-diameter high-alloy blank bearizing method |
| CN115074504A (en) * | 2018-07-10 | 2022-09-20 | 内蒙古北方重工业集团有限公司 | Method for manufacturing large-caliber thick-wall seamless steel pipe of 630 ℃ ultra-supercritical unit G115 |
Citations (4)
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| CN101706019A (en) * | 2009-12-10 | 2010-05-12 | 内蒙古北方重工业集团有限公司 | Method for manufacturing large-caliber thick-wall seamless steel tube in vertical extrusion way |
| JP2011073059A (en) * | 2009-09-02 | 2011-04-14 | Sumitomo Metal Ind Ltd | Method of manufacturing metallic double pipe |
| CN103316941A (en) * | 2013-06-30 | 2013-09-25 | 山西太钢不锈钢股份有限公司 | Method for extruding large-aperture titanium alloy pipe |
| CN103331325A (en) * | 2013-06-18 | 2013-10-02 | 中兴能源装备股份有限公司 | Method for manufacturing ultra-large-diameter pipeline |
-
2013
- 2013-12-26 CN CN201310731441.4A patent/CN103736732A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011073059A (en) * | 2009-09-02 | 2011-04-14 | Sumitomo Metal Ind Ltd | Method of manufacturing metallic double pipe |
| CN101706019A (en) * | 2009-12-10 | 2010-05-12 | 内蒙古北方重工业集团有限公司 | Method for manufacturing large-caliber thick-wall seamless steel tube in vertical extrusion way |
| CN103331325A (en) * | 2013-06-18 | 2013-10-02 | 中兴能源装备股份有限公司 | Method for manufacturing ultra-large-diameter pipeline |
| CN103316941A (en) * | 2013-06-30 | 2013-09-25 | 山西太钢不锈钢股份有限公司 | Method for extruding large-aperture titanium alloy pipe |
Non-Patent Citations (1)
| Title |
|---|
| 张凌峰: "基于有限元（FEM）模拟的P91大口径厚壁无缝钢管的热挤压工艺研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅰ辑》, 15 May 2013 (2013-05-15), pages 022 - 171 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104607467A (en) * | 2014-12-27 | 2015-05-13 | 内蒙古北方重工业集团有限公司 | Large-bore-diameter high-alloy blank bearizing method |
| CN115074504A (en) * | 2018-07-10 | 2022-09-20 | 内蒙古北方重工业集团有限公司 | Method for manufacturing large-caliber thick-wall seamless steel pipe of 630 ℃ ultra-supercritical unit G115 |
| CN115074504B (en) * | 2018-07-10 | 2023-07-14 | 内蒙古北方重工业集团有限公司 | Manufacturing method of 630 ℃ ultra-supercritical unit G115 large-caliber thick-wall seamless steel tube |
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Application publication date: 20140423 |