CN102699032A - Process for machining seamless steel pipe with special drift diameter by using slight-stretch reducing mill - Google Patents
Process for machining seamless steel pipe with special drift diameter by using slight-stretch reducing mill Download PDFInfo
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- CN102699032A CN102699032A CN2012101781729A CN201210178172A CN102699032A CN 102699032 A CN102699032 A CN 102699032A CN 2012101781729 A CN2012101781729 A CN 2012101781729A CN 201210178172 A CN201210178172 A CN 201210178172A CN 102699032 A CN102699032 A CN 102699032A
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Abstract
The invention provides a process for machining a seamless steel pipe with a special drift diameter by using a slight-stretch reducing mill. By the process, the seamless steel pipe can be stably manufactured, process accidents such as an unqualified drift diameter are reduced, the manufacturing efficiency is improved, the manufacturing cost is reduced, and the product competitiveness is improved. According to the process, three-roller concentratively differential drive slight-stretch reducing is adopted, the major semi-axis and the minor semi-axis of a first rack position are respectively 140.00mm, 135.60mm, the reducing rate is 1.6 percent, and the breadth is 0.00; the major semi-axis and the minor semi-axis of a second rack position are respectively 135.91mm and 131.65mm, the reducing rate is 2.9 percent, and the breadth is 0.31; and the major semi-axis and the minor semi-axis of a third rack position are respectively 131.98mm and 127.25mm, the reducing rate is 3.1 percent, and the breadth is 0.33. The process is characterized in that eight rack positions are provided; and the major semi-axis and the minor semi-axis of a fourth rack position are respectively 127.65mm and 126.12mm, the reducing rate is 2.1 percent, and the breadth is 0.40.
Description
Technical field
The present invention relates to process the manufacture field of seamless steel pipe, be specially a kind of mini-stretch reducing mill processing technology of special latus rectum seamless steel pipe.
Background technology
At present, basically all adopt both at home and abroad three-roller type to concentrate the technology in differential gearing slight-stretch reducing footpath in the hot rolling petroleum pipeline Production Line technology, but the technology of effective and reasonable use mini-stretch reducing mill how, rolling high grade of steel, high value added product are being studied always.
The sizing operation is last procedure of the metal fever distortion of hot rolling line.Steel pipe after keeping tandem rolling has the smooth outer surface fineness, also requires to have high-accuracy outside diameter size and ovality.
The wall thickness of existing seamless steel pipe requires generally about-12.5%; Existing mini-stretch reducing mill processing technology can reach this requirement; But because the special latus rectum of customer requirement of 95SS grade of steel; And wall thickness requires more than-8%, produces Φ 244.48 * 13.84 special latus rectum latus rectum rod diameter 215.9mm according to API standard (American Petroleum Institute (API)), is limited to 12.11 (12.5%t) under the wall thickness; Rolling external diameter: 244.48mm～246.95mm (0～+ 1%D), the working process parameter of its sizing is following:
| The hole model | 001 | 002 | 003 | 004 | 005 | 006 | 007 |
| Diameter | 275.60 | 267.56 | 259.23 | 252.77 | 249.41 | 248.68 | 248.68 |
| Reducing rate | 0.016 | 0.029 | 0.031 | 0.025 | 0.013 | 0.003 | 0.000 |
| Major semiaxis | 140.00 | 135.91 | 131.98 | 127.70 | 125.15 | 124.40 | 124.40 |
| Semi-minor axis | 135.60 | 131.65 | 127.25 | 125.07 | 124.26 | 124.28 | 124.28 |
| Spread | 0.00 | 0.31 | 0.33 | 0.45 | 0.08 | 0.14 | 0.12 |
Finished product cold conditions external diameter: 244.6mm～246.5mm, finished product wall thickness: 12.11mm～14.89mm
Being controlled at 20% according to wall thickness tolerance calculates:
Wall thickness: 12.11mm～14.89mm (tolerance-12.5%～+ 7.5%t)
Average wall thickness is: (12.11+14.89)/and 2=13.5mm
The latus rectum gap is: 244.6-13.5*2-215.9=1.7mm
Since the wall thickness of the rolling nonstandard grade of steel of customer requirement be 12.74mm (8%t), be controlled at 20% with interior calculating according to wall thickness tolerance:
Wall thickness: 12.74mm～15.5mm (tolerance-8%～+ 12%)
Average wall thickness: (12.74+15.5)/2=14.12mm
Latus rectum gap: 244.8-14.12*2-215.9=0.36mm,
If consider latus rectum rod diameter tolerance be 0～+ 0.2mm, can't guarantee latus rectum this moment basically, uses rolling Φ 244.48 * 13.84 special latus rectum products of former technology, latus rectum only accounts for more than 80%, product percent of pass is low.
Summary of the invention
To the problems referred to above, the invention provides a kind of mini-stretch reducing mill processing technology of special latus rectum seamless steel pipe, it makes production process more stable; Reduce the generation that latus rectum only waits technology accident; Enhance productivity, reduce production costs, strengthened product competitiveness.
A kind of mini-stretch reducing mill processing technology of special latus rectum seamless steel pipe; Its technical scheme is such: adopt three-roller type to concentrate differential gearing slight-stretch reducing footpath; The major semiaxis of its first frame position: 140.00mm, semi-minor axis: 135.60, reducing rate: 1.6%, spread: 0.00; The major semiaxis of second frame position: 135.91mm, semi-minor axis: 131.65mm, reducing rate: 2.9%, spread: the major semiaxis of 0.31, the three frame position: 131.98mm, semi-minor axis: 127.25mm, reducing rate: 3.1%, spread: 0.33; It is characterized in that: it comprises eight frame positions; Major semiaxis 127.65 mm of the 4th frame position, semi-minor axis: 126.12mm, reducing rate: 2.1%, spread: 0.40; Major semiaxis 126.27mm, the semi-minor axis of the 5th frame position: 124.87, reducing rate: 1.0%, spread: 0.15; Major semiaxis 124.95mm, the semi-minor axis of the 6th frame position: 124.55, reducing rate: 0.7%, spread: 0.08; Major semiaxis 124.58mm, the semi-minor axis of the 7th frame position: 124.52, reducing rate: 0.2%, spread: major semiaxis 124.58mm, the semi-minor axis of 0.03, the eight frame position: 124.52, reducing rate: 0.0%, spread: 0.06.
After using this processing technology, the special latus rectum seamless steel pipe of Φ 244.48 * 13.84 (grade of steel 95SS), rolling external diameter is 245.8mm～246.8mm (ovality is less than 0.5%); Wall thickness is 12.74mm～15.5mm, latus rectum gap: 245.8-12.74-15.5-215.9=1.66mm, latus rectum only accounting for below 5%; It makes production process more stable; Reduce the generation that latus rectum only waits technology accident, enhance productivity, reduce production costs; Strengthened product competitiveness, and the external diameter ovality is controlled at below 0.5% effectively.
The specific embodiment
Produce the logical seamless steel pipe of Φ 244.48 * 13.84 special latus rectums; Grade of steel 95SS; And wall thickness requires more than-8%; Through rolling experience and Theoretical Calculation were confirmed finishing stand pass diameter at 249.1～249.3mm, the concentrated differential gearing slight-stretch reducing of employing three-roller type footpath, the major semiaxis of its first frame position: 140.00mm, semi-minor axis: 135.60, reducing rate: 1.6%, spread: 0.00 in the past; The major semiaxis of second frame position: 135.91mm, semi-minor axis: 131.65mm, reducing rate: 2.9%, spread: the major semiaxis of 0.31, the three frame position: 131.98mm, semi-minor axis: 127.25mm, reducing rate: 3.1%, spread: 0.33; It is characterized in that: it comprises eight frame positions; Major semiaxis 127.65 mm of the 4th frame position, semi-minor axis: 126.12mm, reducing rate: 2.1%, spread: 0.40; Major semiaxis 126.27mm, the semi-minor axis of the 5th frame position: 124.87, reducing rate: 1.0%, spread: 0.15; Major semiaxis 124.95mm, the semi-minor axis of the 6th frame position: 124.55, reducing rate: 0.7%, spread: 0.08; Major semiaxis 124.58mm, the semi-minor axis of the 7th frame position: 124.52, reducing rate: 0.2%, spread: major semiaxis 124.58mm, the semi-minor axis of 0.03, the eight frame position: 124.52, reducing rate: 0.0%, spread: 0.06.
Its detail parameters sees the following form:
| The hole model | 001 | 002 | 003 | 004 | 005 | 006 | 007 | 008 |
| Diameter | 275.60 | 267.56 | 259.23 | 253.77 | 251.14 | 249.50 | 249.10 | 249.10 |
| Reducing rate | 0.016 | 0.029 | 0.031 | 0.021 | 0.010 | 0.007 | 0.002 | 0.000 |
| Major semiaxis | 140.00 | 135.91 | 131.98 | 127.65 | 126.27 | 124.95 | 124.58 | 124.58 |
| Semi-minor axis | 135.60 | 131.65 | 127.25 | 126.12 | 124.87 | 124.55 | 124.52 | 124.52 |
| Spread | 0.00 | 0.31 | 0.33 | 0.40 | 0.15 | 0.08 | 0.03 | 0.06 |
Rolling external diameter is 245.8mm～246.8mm (ovality is less than 0.5%); Wall thickness is 12.74mm～15.5mm, latus rectum gap: 245.8-12.74-15.5-215.9=1.66mm, latus rectum only accounting for below 5%.
Claims (1)
1. the mini-stretch reducing mill processing technology of a special latus rectum seamless steel pipe; Adopt three-roller type to concentrate differential gearing slight-stretch reducing footpath; The major semiaxis of its first frame position: 140.00mm, semi-minor axis: 135.60, reducing rate: 1.6%, spread: 0.00; The major semiaxis of second frame position: 135.91mm, semi-minor axis: 131.65mm, reducing rate: 2.9%, spread: the major semiaxis of 0.31, the three frame position: 131.98mm, semi-minor axis: 127.25mm, reducing rate: 3.1%, spread: 0.33; It is characterized in that: it comprises eight frame positions; Major semiaxis 127.65 mm of the 4th frame position, semi-minor axis: 126.12mm, reducing rate: 2.1%, spread: 0.40; Major semiaxis 126.27mm, the semi-minor axis of the 5th frame position: 124.87, reducing rate: 1.0%, spread: 0.15; Major semiaxis 124.95mm, the semi-minor axis of the 6th frame position: 124.55, reducing rate: 0.7%, spread: 0.08; Major semiaxis 124.58mm, the semi-minor axis of the 7th frame position: 124.52, reducing rate: 0.2%, spread: major semiaxis 124.58mm, the semi-minor axis of 0.03, the eight frame position: 124.52, reducing rate: 0.0%, spread: 0.06.
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Citations (4)
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| JPS5630015A (en) * | 1979-08-20 | 1981-03-26 | Nippon Steel Corp | Continuous rolling method for pipe |
| DE3924261C2 (en) * | 1989-07-20 | 1994-05-26 | Mannesmann Ag | Caliber contour of the rolls of a reducing or stretch-reducing mill |
| CN101337236A (en) * | 2007-07-06 | 2009-01-07 | 中冶东方工程技术有限公司 | Rolling mill technique of three-roller full-floating core rod tandem rolling tube |
| CN101428297A (en) * | 2008-12-03 | 2009-05-13 | 无锡西姆莱斯石油专用管制造有限公司 | Section design method for sizing machine for casing tube with special through diameter |
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2012
- 2012-06-01 CN CN2012101781729A patent/CN102699032A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5630015A (en) * | 1979-08-20 | 1981-03-26 | Nippon Steel Corp | Continuous rolling method for pipe |
| DE3924261C2 (en) * | 1989-07-20 | 1994-05-26 | Mannesmann Ag | Caliber contour of the rolls of a reducing or stretch-reducing mill |
| CN101337236A (en) * | 2007-07-06 | 2009-01-07 | 中冶东方工程技术有限公司 | Rolling mill technique of three-roller full-floating core rod tandem rolling tube |
| CN101428297A (en) * | 2008-12-03 | 2009-05-13 | 无锡西姆莱斯石油专用管制造有限公司 | Section design method for sizing machine for casing tube with special through diameter |
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Application publication date: 20121003 |