CN103736734B - Hot rolling CPE unit prepares the technique of the super 13Cr seamless steel pipe of high-chromium alloy - Google Patents
Hot rolling CPE unit prepares the technique of the super 13Cr seamless steel pipe of high-chromium alloy Download PDFInfo
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Abstract
The invention discloses the technique that a kind of hot rolling CPE unit prepares the super 13Cr seamless steel pipe of high-chromium alloy, the step of this technique is as follows: a) provide a pipe; B) fracture is again carried out after pickling and reconditioning process to pipe, form multiple points of pipes; C) cold centering PROCESS FOR TREATMENT is carried out to a point pipe; D) by point pipe preheating after cold centering, and held for some time; E) again by point heating of pipe blank after preheating, and held for some time; And then all heat treatment, and held for some time; Wherein, heating environment temperature controls at 800 DEG C ~ 900 DEG C; Soaking environment temperature controls at 1200 DEG C ~ 1010 DEG C; F) adopt punch to carry out perforation process to point pipe after step e) process, form hollow billet, and the hollow billet temperature after control punch is 1230 DEG C ~ 1240 DEG C, then by hollow billet reducing process.Temperature in this technology controlling and process technical process, makes that pipe deformation drag in preparation process is little, speed of deformation fast, inner surface not easily forms defect, thus ensure that the product quality of steel pipe.
Description
Technical field
The present invention relates to the technique that a kind of hot rolling CPE unit prepares the super 13Cr seamless steel pipe of high-chromium alloy, belong to metal rolled technical field.
Background technology
At present, in the Hot Rolling Mill moulding process of existing high-chromium alloy super 13Cr stainless steel oil pipe, be blank for hot rolling CPE unit roll forming technique always.And this steel grade is existed in other types Hot Rolling Mill forming process that resistance of deformation is large, speed of deformation is slow, require high to temperature control precision in the operation of rolling, easily form the problems such as defect in inner surface.
Summary of the invention
Technical problem to be solved by this invention is the defect overcoming prior art, a kind of hot rolling CPE unit is provided to prepare the technique of the super 13Cr seamless steel pipe of high-chromium alloy, temperature in this technology controlling and process technical process, make that pipe deformation drag in preparation process is little, speed of deformation is fast, inner surface not easily forms defect, thus ensure that the product quality of steel pipe.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of hot rolling CPE unit prepares the technique of the super 13Cr seamless steel pipe of high-chromium alloy, and the step of this technique is as follows:
A) one pipe is provided;
B) fracture is again carried out after pickling and reconditioning process to pipe, form multiple points of pipes;
C) cold centering PROCESS FOR TREATMENT is carried out to a point pipe;
D) by point pipe preheating after cold centering, and held for some time;
E) again by point heating of pipe blank after preheating, and held for some time; And then all heat treatment, and held for some time; Wherein, heating environment temperature controls at 800 DEG C ~ 900 DEG C; Soaking environment temperature controls at 1010 DEG C ~ 1200 DEG C;
F) punch is adopted to through step e) a point pipe after process carries out perforation process, formation hollow billet, and the hollow billet temperature after control punch is 1230 DEG C ~ 1240 DEG C, then by hollow billet reducing process;
G) before entering Push bench pipe mill, hollow billet temperature is kept to be not less than 1150 DEG C, Push bench pipe mill is adopted to be through on its plug by the hollow billet after perforation, by Push bench pipe mill to be arranged continuously and the roller die that pass diameter reduces gradually extends rolling continuously to hollow billet, form hollow forging;
H) after adopting winding arbor extraction press to carry out loose plug and the process of depoling rod to hollow forging, then hot saw sawing is carried out;
I) again by through step h) hollow forging after process heats again; Wherein, then the environment temperature heated be 980 DEG C ~ 1000 DEG C;
J) adopt stretch reducing unit by it to be arranged continuously and the tube reducing roller die that reduces gradually of pass diameter is rolled the hollow forging after heating again, reach the hot fished pipe of required size external diameter;
K) by hot fished pipe cooling processing on cold bed, and required fished pipe after finishing, is formed.
Further, described step k) in, correction step comprises product surface inspection, defect detecting test and packaging and warehousing successively.
Further, described step b) in, adopt sulfuric acid heating pickling, soak time half an hour, the reconditioning breadth depth ratio < 6 of reconditioning.
Further, described steps d) in, adopt preheating furnace preheating, the furnace temperature of preheating furnace is heated to 800 DEG C, start point pipe charging after by cold centering, and the temperature of point pipe reaches 400 DEG C after insulation 30min;
Further, described step e) in, adopt annular furnace heating and soaking, and the temperature retention time after heating is 30min; Temperature retention time after equal heat treatment is 45min.
Further, described step f) in, the perforating roller advancing angle of punch is 8 degree; Perforation pierced billet speed: motor output speeds is adjusted to 180rpm from 369rpm by the buncher on punch; Perforation adopts molybdenum base top, and molybdenum base top needs preheating and insulation, and adopt flame air pressure gun scene to be heated to 700 DEG C ~ 800 DEG C, the heat time is no less than 5 minutes, and glass dust is spread in molybdenum base top.
Further, described step g) in, plug temperature controls at 550 DEG C ~ 600 DEG C.
After have employed technique scheme, 13Cr steel due to Cr content higher, improve Ac3 transformation temperature, again because of the existence of a large amount of alloy carbide make the carbon in tissue and chromium Elemental redistribution uneven, its diffusion velocity in heating process is slow, the poor thermal conductivity of steel, particularly when comparatively low temperature, for preventing cracking in heating process, need strict its heating-up temperature of control, firing rate, during the present invention adopts first low-temperature prewarming again, temperature heats high temperature soak again, and the hollow billet temperature before controlling its hollow billet temperature after perforation and entering Push bench pipe mill, finally also heat again, the present invention controls the temperature in technical process, make pipe deformation drag in preparation process little, speed of deformation is fast, inner surface not easily forms defect, thus ensure that the product quality of the super 13Cr seamless steel pipe of high-chromium alloy.
Accompanying drawing explanation
Fig. 1 is the temperature profile that hot rolling CPE unit of the present invention prepares the technique of the super 13Cr seamless steel pipe of high-chromium alloy.
Detailed description of the invention
In order to make content of the present invention more easily be clearly understood, below according to specific embodiment also by reference to the accompanying drawings, the present invention is further detailed explanation.
The steel pipe trimmed size of the present embodiment: φ 88.9 × 6.45 × 10000-11500mm;
Pipe specification: φ 125 × 1630mm;
Pipe material: 13Cr;
The general steps of manufacturing process is: bright pipe → pickling mill repaiies → pipe fracture → cold centering → point pipe preheating → annular furnace heating → point pipe perforation → hollow billet reducing → push pipe → pine rod → take off rod → hot saw → heat again → stretch reducing → cold bed to cool → show inspection → flaw detection → packaging and warehousing.
Hot rolling CPE unit prepares a technique for the super 13Cr seamless steel pipe of high-chromium alloy, and the step of this technique is as follows:
A) one pipe is provided;
B) fracture is again carried out after pickling and reconditioning process to pipe, form multiple points of pipes; Wherein, adopt sulfuric acid heating pickling, soak time half an hour, the reconditioning breadth depth ratio < 6 of reconditioning, fracture adopts model 3050 saw blade, and order carries out sawing fracture.
C) cold centering PROCESS FOR TREATMENT is carried out to a point pipe; This step is in order to reduce preperforative temperature drop, and reduce the perforation degree of eccentricity, internal point is designed and sized to R=10mm, the cylinder of h=20mm, does not then carry out heat centering in course of hot rolling;
D) by point pipe preheating after cold centering, and held for some time; This step adopts preheating furnace preheating, and the furnace temperature of preheating furnace is heated to 800 DEG C, start point pipe charging after by cold centering, and a point pipe reaches 400 DEG C at preheating in-furnace temperature after insulation 30min;
E) again by point heating of pipe blank after preheating, and held for some time; And then all heat treatment, and held for some time; Wherein, heating environment temperature controls at 800 DEG C ~ 900 DEG C; Soaking environment temperature controls at 1010 DEG C ~ 1200 DEG C; Annular furnace can be adopted to heat and soaking, and the temperature retention time after heating is 30min; Temperature retention time after equal heat treatment is 45min.
F) punch is adopted to through step e) a point pipe after process carries out perforation process, formation hollow billet, and the hollow billet temperature after control punch is 1230 DEG C ~ 1240 DEG C, then by hollow billet reducing process; Wherein, base temperature 1200 ~ 1210 DEG C during perforation, hollow billet temperature 1230 ~ 1240 DEG C after perforation, the perforating roller advancing angle of punch is 8 degree; Perforating roller size: φ 500mm; Perforation pierced billet speed: motor output speeds is adjusted to 180rpm from 369rpm by the buncher on punch; Perforation adopts molybdenum base top, and molybdenum base top needs preheating and insulation, and adopt flame air pressure gun scene to be heated to 700 DEG C ~ 800 DEG C, the heat time is no less than 5 minutes, and glass dust is spread in molybdenum base top; Reducing adopts reducing tool and mould hexangle type φ 125mm.
G) before entering Push bench pipe mill, hollow billet temperature is kept to be not less than 1150 DEG C, Push bench pipe mill is adopted to be through on its plug by the hollow billet after perforation, by Push bench pipe mill to be arranged continuously and the roller die that pass diameter reduces gradually extends rolling continuously to hollow billet, form hollow forging; Wherein, in order to reduce push pipe load, plug temperature controls, at 550 DEG C ~ 600 DEG C, to ensure that the lubricating status that plug is best, avoids push pipe load problems of too.Roller die speed and load: in single multiple length φ 88.9*6.45 production process, be down to 2.5m/s by roller die pace by original 3.0m/s, increase jacking force, roller die load: 2200-2600A.
H) after adopting winding arbor extraction press to carry out loose plug and the process of depoling rod to hollow forging, then hot saw sawing is carried out;
I) again by through step h) hollow forging after process heats again; Wherein, then the environment temperature heated is 980 DEG C ~ 1000 DEG C, ensure that steel pipe has good thermoplastic shaping; Reheating furnace can be adopted to heat again, and reheating furnace is for being intervally arranged, and it can guarantee that the rolling temperature of steel pipe is 965 DEG C-980 DEG C, finishing temperature 930 DEG C-980 DEG C.
J) adopt stretch reducing unit by it to be arranged continuously and the tube reducing roller die that reduces gradually of pass diameter is rolled the hollow forging after heating again, reach the hot fished pipe of required size external diameter; Open deceleration and load: open and subtract mair motor rotating speed: 1200rpm, open and subtract superimposed motor rotating speed: 1100rpm.Open and subtract Main motor current: 320-360A, open and subtract superimposed motor electric current: 160-170A.
K) by hot fished pipe cooling processing on cold bed, and required fished pipe after finishing, is formed; Wherein, correction step comprises product surface inspection, defect detecting test and packaging and warehousing successively.
Annular furnace heating according to low temperature at a slow speed, high temperature heating cycle fast, during concrete rolling, the following hot rolling CPE unit as Fig. 1 of heating requirements prepares the temperature profile of the technique of the super 13Cr seamless steel pipe of high-chromium alloy.
In embodiment, in step g) in, roller die adopts the mode of new Bo6+4 to design, and reduces the deflection of single chassis, and prevent roller die frame and roll damage, roller die pass parameters sees the following form.
In embodiment, in step j) in, tube reducing roller die adopts the mode of new CR6+2 to design, and reduces pass ovality, improves finished size precision.Subtracting pass parameters sees the following form.
Presentation quality through high-chromium alloy super 13Cr seamless steel pipe prepared by embodiment technique: after the hot and cooling of hot rolling specification 88.9*6.45 seamless steel pipe, product surface quality is good, meets standard-required.
As following table after size and flaw detection:
As can be seen from this table, hot-rolled product physical dimension meets the requirement of API SPEC 5CT codes and standards, and product flaw detection qualification rate is 100%, meets product standard requirement.
Above-described specific embodiment; technical problem, technical scheme and beneficial effect that the present invention solves are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. hot rolling CPE unit prepares a technique for the super 13Cr seamless steel pipe of high-chromium alloy, it is characterized in that the step of this technique is as follows:
A) one pipe is provided;
B) fracture is again carried out after pickling and reconditioning process to pipe, form multiple points of pipes;
C) cold centering PROCESS FOR TREATMENT is carried out to a point pipe;
D) by point pipe preheating after cold centering, and held for some time;
E) again by point heating of pipe blank after preheating, and held for some time; And then all heat treatment, and held for some time; Wherein, heating environment temperature controls at 800 DEG C ~ 900 DEG C; Soaking environment temperature controls at 1010 DEG C ~ 1200 DEG C;
F) punch is adopted to through step e) a point pipe after process carries out perforation process, formation hollow billet, and the hollow billet temperature after control punch is 1230 DEG C ~ 1240 DEG C, then by hollow billet reducing process;
G) before entering Push bench pipe mill, hollow billet temperature is kept to be not less than 1150 DEG C, Push bench pipe mill is adopted to be through on its plug by the hollow billet after perforation, by Push bench pipe mill to be arranged continuously and the roller die that pass diameter reduces gradually extends rolling continuously to hollow billet, form hollow forging;
H) after adopting winding arbor extraction press to carry out loose plug and the process of depoling rod to hollow forging, then hot saw sawing is carried out;
I) again by through step h) hollow forging after process heats again; Wherein, then the environment temperature heated be 980 DEG C ~ 1000 DEG C;
J) adopt stretch reducing unit by it to be arranged continuously and the tube reducing roller die that reduces gradually of pass diameter is rolled the hollow forging after heating again, reach the hot fished pipe of required size external diameter;
K) by hot fished pipe cooling processing on cold bed, and required fished pipe after finishing, is formed.
2. hot rolling CPE unit according to claim 1 prepares the technique of the super 13Cr seamless steel pipe of high-chromium alloy, it is characterized in that: described step k) in, correction step comprises product surface inspection, defect detecting test and packaging and warehousing successively.
3. hot rolling CPE unit according to claim 1 prepares the technique of the super 13Cr seamless steel pipe of high-chromium alloy, it is characterized in that: described step b) in, adopt sulfuric acid heating pickling, soak time half an hour, the reconditioning breadth depth ratio < 6 of reconditioning.
4. hot rolling CPE unit according to claim 1 prepares the technique of the super 13Cr seamless steel pipe of high-chromium alloy, it is characterized in that: described steps d) in, adopt preheating furnace preheating, the furnace temperature of preheating furnace is heated to 800 DEG C, start point pipe charging after by cold centering after insulation 30min, and the temperature of point pipe reaches 400 DEG C.
5. hot rolling CPE unit according to claim 1 prepares the technique of the super 13Cr seamless steel pipe of high-chromium alloy, it is characterized in that: described step e) in, adopt annular furnace heating and soaking, and the temperature retention time after heating is 30min; Temperature retention time after equal heat treatment is 45min.
6. hot rolling CPE unit according to claim 1 prepares the technique of the super 13Cr seamless steel pipe of high-chromium alloy, it is characterized in that: described step f) in, the perforating roller advancing angle of punch is 8 degree; Perforation pierced billet speed: motor output speeds is adjusted to 180rpm from 369rpm by the buncher on punch; Perforation adopts molybdenum base top, and molybdenum base top needs preheating and insulation, and adopt flame air pressure gun scene to be heated to 700 DEG C ~ 800 DEG C, the heat time is no less than 5 minutes, and glass dust is spread in molybdenum base top.
7. hot rolling CPE unit according to claim 1 prepares the technique of the super 13Cr seamless steel pipe of high-chromium alloy, it is characterized in that: described step g) in, plug temperature controls at 550 DEG C ~ 600 DEG C.
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Families Citing this family (10)
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| CN104907353B (en) * | 2015-06-16 | 2017-07-07 | 攀钢集团成都钢钒有限公司 | The production method of high chromium content ferrite stainless steel seamless steel pipe blank |
| CN104874606B (en) * | 2015-06-16 | 2017-06-30 | 攀钢集团成都钢钒有限公司 | The production method of high chromium content ferrite stainless steel seamless steel pipe |
| CN105855293B (en) * | 2016-04-05 | 2017-08-29 | 攀钢集团成都钢钒有限公司 | The production method of super 13Cr oil pipes |
| CN106964658A (en) * | 2017-05-08 | 2017-07-21 | 江苏常宝普莱森钢管有限公司 | A kind of hot rolled seamless steel tube processing method and its device |
| CN109590333B (en) * | 2018-11-26 | 2021-05-14 | 大冶特殊钢有限公司 | Pipe jacking method for preparing thin-wall steel pipe by using small blank |
| CN110280592B (en) * | 2019-07-19 | 2020-09-11 | 大冶特殊钢有限公司 | Seamless tube rolling method for ultrahigh-strength alloy |
| CN112893470B (en) * | 2021-01-20 | 2022-11-08 | 杭州淳通新材料科技有限公司 | Seamless steel tube forming process |
| CN114160603A (en) * | 2021-11-01 | 2022-03-11 | 大冶特殊钢有限公司 | Manufacturing method of P92 small-caliber thick-wall seamless steel pipe |
| CN113976628B (en) * | 2021-11-08 | 2024-05-28 | 中冶东方工程技术有限公司 | Production process and device of stainless steel seamless steel tube |
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