CN102974979B - A kind of method using steel ingot big diameter-reducing formation die blank - Google Patents
A kind of method using steel ingot big diameter-reducing formation die blank Download PDFInfo
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Abstract
A kind of method using steel ingot big diameter-reducing formation die blank, including ingot smelting, steel ingot is rechecked, annular furnace heats, hydraulic pressure punching, big tube reducing perforation, cycle tube rolling, artificial initial survey, aligning, thick machining, ultrasonic examination, heat treatment, physical and chemical inspection is qualified, polish, magnetic powder inspection, artificial reinspection, packaging warehouse-in, ingot material is 21CrMo10, the circumscribed circle diameter D of the rib of steel ingot body peripheral is 660 ~ 1650mm, steel ingot circumscribed circle diameter D is compared with the big 40mm of inscribed circle diameter d of rib, the quantity of rib is 16 ~ 24 limits, range of taper is 1.6 ~ 2.5 °, pipe die minimum compression ratio u is 2.7 ~ 3.3.Bottle base tapered roller and top oblique milling big tube reducing perforation are obtained hollow billet.The Pierre's wresting should excised when the present invention makes full use of rolling, is greatly improved raw-material utilization rate, and pipe die manufacturing cost reduces nearly 40%, and production efficiency is high, substantially achieves all standing of pipe die specification.
Description
Technical field
The present invention relates to pipe die manufacturing technology field, a kind of method using steel ingot big diameter-reducing formation die blank.
Background technology
At present, utilize centrifugal casting technology to produce ductile iron pipe and there is the advantage that rhythm of production is fast and efficiency is high, there is extremely vast potential for future development.And pipe die is the large-scale critical component watering cast iron pipe on centrifugal casting machine, and use environment the most severe.Pipe die is under high speed rotating state, and in cast, molten iron applies because of centrifugal action on pipe die inwall, makes pipe die inner wall temperature drastically raise, and outer surface passes through circulating water to reduce temperature.The composite conditions such as alternating thermal stress, tensile stress and distorting stress are born for a long time due to pipe die, thus high to pipe die prescription, and the conventional trade mark of pipe die pipe is 21CrMo10.
The specification limit that pipe die is conventional is DN80 ~ DN1200, and female end largest outside diameter reaches 1569mm.According to different specifications, its processing technique and method are also different: 1) for specification less than DN
The pipe die of 200, blank uses solid forging, machining to use deep hole drilling, the process of bore hole；2) for specification pipe die in the range of DN 200 ~ DN 500, blank solid forging, use jacking, the process of bore hole, the core material extracted can be as the blank of a little specification pipe die, it is achieved that secondary utilizes；3) for specification more than the pipe die of DN 500, use hollow forging, high efficiency deep hole building-block machine is processed, it is achieved that clamped one time, the whole body position positions such as pipe die endoporus, cylindrical process, and production efficiency is higher.
It is the pipe die in the little scope of DN 200 ~ DN 500 for specification, also has the pipe die manufacturing process using continuous casting billet graceful formula point cycle tube rolling to produce blank, this technique has played lumber recovery height, low cost and the advantage of less energy consumption that continuous casting billet has, and reduces the production cost of pipe die.But owing to being limited (maximum outside diameter is 800mm) by continuous casting billet specification, the die blank (DN600 die blank big end external diameter should be not less than 860mm) of DN 600 and above specification can not be produced；Pipe die female end only extends (being limited by Mannesmann piercer tube reducing ability, compression ratio is about 1.4) by the perforation of graceful formula, and without cycle pipe mill rolling deformation, the internal structure that continuous casting billet is loose can not be improved, and even can more deteriorate；Unavoidably there is loose and shrinkage cavity in heavy caliber alloy continuous casting circular tube blank center, need before feeding intake pipe endoporus is carried out rough bore processing, with table quality in ensureing pipe die base, (pipe center porosity and shrinkage cavity be not if removed, through annular furnace heated oxide, in after graceful formula roll piercing, table can form deeper crackle, and subsequent handling cannot seam).
Existing pipe die manufacturing process is primarily present following deficiency:
(1) the many employings of existing pipe die are solid or hollow forging deep hole machining mode manufactures, although have employed jacking technique in Large Diameter Pipeline pipe die manufacture to improve utilization rate of raw materials, material wastage rate is typically about 40%.
(2) there is pipe die female end not easy-formation in existing pipe die manufacture, needs additionally to use the techniques such as thickening, expander to complete the manufacture of trumpet type pipe die female end, and this allows for existing pipe die manufacturing process and there is the problems such as complex process, manufacturing cycle length partially.
(3) continuous casting billet cycle tube rolling is used to produce die blank, Pierre's wresting of self-assembling formation, i.e. trumpet type pipe die female end does not forge and press roll forming through the cycle, it cannot be guaranteed that the same with other parts, there is the compression ratio (rolling ratio) close with forging stock, it is impossible to ensure the pipe die raw-material performance of this part.And female end couples with driving belt during centrifugal casting, driving pipe die high speed rotating, applying working condition is the most severe, there is bigger potential safety hazard；Before heavy caliber continuous casting circular tube blank feeds intake, it is necessary to pipe endoporus is carried out rough bore processing, add loss (about 5%) and the Boring cost of material；Limited by continuous casting billet specification, be there is also the problem that die blank production range is narrow.
Summary of the invention
It is an object of the invention to overcome the above-mentioned deficiency of prior art, and a kind of method using steel ingot big diameter-reducing formation die blank is provided, to solve present in prior art, complex manufacturing, manufacturing cycle are partially long, lumber recovery is low, and product specification coverage the most extensively waits deficiency.
The technical scheme is that a kind of method using steel ingot big diameter-reducing formation die blank, including ingot smelting, steel ingot reinspection, annular furnace heating, hydraulic pressure punching, the perforation of big tube reducing, cycle tube rolling, artificial initial survey, aligning, thick machining, ultrasonic examination, heat treatment, physical and chemical inspection, polish, magnetic powder inspection, artificial reinspection, packaging warehouse-in；During ingot smelting, in view of the working environment that cast pipe mold is special, and ingot quality is basis, ingot material is 21CrMo10, and strictly control the content of phosphorus, sulfur, nitrogen, hydrogen, oxygen, wherein phosphorus content is less than 0.008%, sulfur content is less than 0.004%, nitrogen content is less than 100ppm, hydrogen content is less than 2 ppm, oxygen content is less than 35 ppm, and steel ingot uses following technique to produce: blast furnace ironmaking, electric furnace steel making, LF stove refine, ladle are skimmed, VD stove vacuum outgas, feed silk process, teeming, check, cut rising head, reconditioning；When steel ingot is rechecked, the surface quality of steel ingot, physical dimension was rechecked before annular furnace heats, the circumscribed circle diameter D of the rib of steel ingot body peripheral is 660 ~ 1650 mm, steel ingot circumscribed circle diameter D is compared with the big 40mm of inscribed circle diameter d of rib, i.e. D=d+40 mm, the quantity of rib is 16 ~ 24 limits, and range of taper is 1.6 ~ 2.5 °, pipe die minimum compression ratio u(rolling ratio) be 2.7 ~ 3.3(female end)；The inscribed circle diameter d of the rib of body peripheral and pipe die female end external diameter H is about following (unit: mm): d × d=4 × u × S × (H+10-S) of relational expression (in formula, S is hollow billet wall thickness) of minimum compression ratio u.
Due to the fact that and use the steel ingot of special construction and big reducing process to shape die blank, steel ingot can be given full play to there is low cost, less energy consumption, lumber recovery high, can effectively combine hydraulic pressure punching, the big tube reducing of tapered roller is bored a hole, the technology such as cycle pipe mill forging rolling, can not only ensure that die blank entirety has the performance close with forging, the Pierre's wresting should excised when simultaneously can make full use of again rolling, increase substantially raw-material utilization rate, pipe die manufacturing cost reduces nearly 40%, production efficiency is high, technique is simple, manufacturing cycle is short, in product safety reliability, deformation technique, compression ratio (particularly female end) and pipe die specification coverage aspect have greater advantage, substantially all standing of pipe die specification is achieved.
Below in conjunction with the drawings and specific embodiments, the detailed content of the present invention is further described.
Accompanying drawing explanation
Fig. 1 is the structural representation of the steel ingot that the present invention uses；
Fig. 2 is the left view of Fig. 1；
Fig. 3 is the right view of Fig. 1；
Fig. 4 is the schematic diagram that steel ingot is positioned at when vertical water pressure perforating press Nei Monei punching starts；
Fig. 5 is the schematic diagram that steel ingot is positioned at the end of vertical water pressure perforating press Nei Monei punching；
Fig. 6 is the bottle base schematic diagram in tapered roller oblique milling of the present invention big tube reducing perforation procedure；
Fig. 7 is the hollow billet schematic diagram after tapered roller oblique milling of the present invention big tube reducing punch off；
Fig. 8 is present invention cycle pipe mill forging rolling hollow billet schematic diagram when starting；
Fig. 9 is the hollow forging schematic diagram during present invention cycle pipe mill forging rolling；
Figure 10 is the structural representation of die blank of the present invention；
Figure 11 is the structural representation of pipe die of the present invention.
Detailed description of the invention
Embodiment one:
A kind of method using steel ingot big diameter-reducing formation DN 300 type die blank, including ingot smelting, steel ingot reinspection, annular furnace heating, hydraulic pressure punching, the perforation of big tube reducing, cycle tube rolling, artificial initial survey, aligning, thick machining, ultrasonic examination, heat treatment, physical and chemical inspection, polish, magnetic powder inspection, artificial reinspection, packaging warehouse-in；
Ingot smelting: in view of the working environment that cast pipe mold is special, and ingot quality is basis, ingot material is 21CrMo10, and strictly control the content of phosphorus, sulfur, nitrogen, hydrogen, oxygen, wherein phosphorus content is less than 0.008%, sulfur content is less than 0.004%, nitrogen content is less than 100ppm, hydrogen content is less than 2 ppm, oxygen content is less than 35 ppm, and steel ingot uses following technique to produce: blast furnace ironmaking, electric furnace steel making, LF stove refine, ladle are skimmed, VD stove vacuum outgas, feed silk process, teeming, check, cut rising head, reconditioning；
Steel ingot is rechecked: rechecked the surface quality of steel ingot, physical dimension (as Figure 1-3) before annular furnace heats, the circumscribed circle diameter D of the rib 2 of steel ingot body 1 periphery is 660mm, steel ingot circumscribed circle diameter D is compared with the big 40mm of inscribed circle diameter d of rib 2, i.e. D=d+40 mm, the quantity of rib 2 is 18 limits, range of taper is 2.2 °, pipe die minimum compression ratio u(rolling ratio) be 2.7(female end)；
Annular furnace heats: use annular furnace by Heating Steel Ingots to hydraulic pressure punching extrusion temperature 1180 DEG C, owing to pipe die pipe alloying element is many, and steel ingot specification is huge, heat improper easy generation and add thermal defect, use suitable heating-up temperature and firing rate, ensureing in production when steel ingot enters stove, preheated one-section is not more than 720 DEG C, 3 hours heat time heating times；Preheating two-stage nitration temperature controls at 810 ~ 830 DEG C, 1.5 hours heat time heating times；Heat one section of temperature and control at 900 ~ 920 DEG C, 1.5 hours heat time heating times；Heating two-stage nitration temperature controls at 1030 ~ 1050 DEG C, 2 hours heat time heating times；Heat three sections of temperature and control at 1130 ~ 1150 DEG C, 2 hours heat time heating times；Heat four sections of temperature and control at 1250 ~ 1270 DEG C, 1.5 hours heat time heating times；Soaking zone temperature controls at 1240 ~ 1260 DEG C, 2 hours heat time heating times；Total 14 hours heat time heating times；
Hydraulic pressure punching: be placed in by steel ingot in the interior mould 3 of hydraulic pressure perforating press, with drift 4 punching (as illustrated in figures 4-5), obtains external diameter 670mm, tapering is the bottle base 5 of 1.5 °, and the metal of bottle base 5 overcharges full scale 3.8% ~ 10%；
Big tube reducing perforation: bottle base 5 tapered roller 6 and top 7 oblique milling big tube reducing perforation are obtained hollow billet 8(as shown in fig. 6-7), overall diameter reduction ratio is 15.1%, ovality is 1.05, rolling angle is-3 °, reducing rate 21%, after tube reducing perforation, hollow billet 8 external diameter is 530 mm, the big 10mm of relatively pipe die female end external diameter (520 mm)；
nullCycle tube rolling: as seen in figs. 8-10，The roll 10 utilizing cycle pipe mill carries out forging rolling to hollow billet 8，Retain Pierre's wresting of self-assembling formation，Ensure that Pierre's wresting has rational allowance，Avoid raw-material waste，Design cycle Tube Rolling Train Φ 390mm macroporous type，Including forging rolling section、Finish rolling section、Finish to gauge section and the curvilinear equation of shallow pass section，Wherein forging rolling section is envelope、Forging rolling section initial angle is 25 °，Forging rolling section angle is 90 °，Forging rolling section curve length of run scope is 850mm，Control roll rotational speed 48rpm，Blast 5.1bar，Feed people and measure 55mm，Cycle tube rolling retains the long hollow billet of 180mm and do not roll latter stage，For taking horizontal sample and the processing of pipe die female end，With plug 9 and roll 10, one end of hollow billet 8 is rolled into hollow forging 11，Other end self-assembling formation Pierre's wresting 12，Thus form die blank；
Artificial initial survey: surface quality and dimensional accuracy to die blank are tested；
Aligning: use gag straightener that die blank is aligned, it is ensured that total length flexibility is not more than 6mm；
Thick machining: die blank is carried out surfaces externally and internally rough cut processing and in socket end table built-up welding step, be allowed to meet the requirement of DN300 die blank pattern；
Ultrasonic examination: carry out L2 level manual ultrasonic flaw by GB/T 5777 standard-required, it is ensured that die blank inherent quality；
Heat treatment: modifier treatment is carried out with regard to die blank, hardening heat: 880 DEG C, temperature retention time 60min, temperature: 620 DEG C, temperature retention time 140min, obtain high-strength tenacity tempered sorbite tissue；
Physical and chemical inspection: for fully inspection die blank performance, respectively staying at die blank two ends 70～120 surpluses to do horizontal mechanical performance and measure, the comprehensive mechanical property of assessment die blank meets the requirement of international standard；
Polish: as shown in figure 11, thick mach die blank is refined and micro cutting is processed into pipe die, pipe die size is made to meet the product design document that user provides, ensure that the surface roughness Ra of the inner surface of pipe die, female end 13 and socket end 14 sealing surface is less than 6.3 um less than 1.6 um, the roughness Ra on other surface of pipe die；
Magnetic powder inspection: pipe die outer surface does not has crackle after magnetic powder inspection；
Artificial reinspection: pipe die inner surface does not has the defects such as macroscopic crackle, scuffing, impression, corrosion, pipe die overall dimensions meets the requirement of the DN300 product design document that user provides；
Packaging warehouse-in: pipe die through spray printing with after weighing, packaging warehouse-in.
Embodiment two:
A kind of method using steel ingot big diameter-reducing formation DN 600 type die blank, including ingot smelting, steel ingot reinspection, annular furnace heating, hydraulic pressure punching, the perforation of big tube reducing, cycle tube rolling, artificial initial survey, aligning, thick machining, ultrasonic examination, heat treatment, physical and chemical inspection, polish, magnetic powder inspection, artificial reinspection, packaging warehouse-in；
When steel ingot is rechecked, the circumscribed circle diameter D of the rib 2 of steel ingot body 1 periphery is 970mm, and steel ingot circumscribed circle diameter D is compared with the big 40mm of inscribed circle diameter d of rib 2, i.e. D=d+40 mm, the quantity of rib 2 is 18 limits, and range of taper is 1.8 °, pipe die minimum compression ratio u(rolling ratio) be 3.0(female end)；
During annular furnace heating, using annular furnace by Heating Steel Ingots to hydraulic pressure punching extrusion temperature 1180 DEG C, when steel ingot enters stove, preheated one-section is not more than 720 DEG C, 6 hours heat time heating times；Preheating two-stage nitration temperature controls at 810 ~ 830 DEG C, 1.8 hours heat time heating times；Heat one section of temperature and control at 900 ~ 920 DEG C, 1.8 hours heat time heating times；Heating two-stage nitration temperature controls at 1030 ~ 1050 DEG C, 2.2 hours heat time heating times；Heat three sections of temperature and control at 1130 ~ 1150 DEG C, 2.2 hours heat time heating times；Heat four sections of temperature and control at 1250 ~ 1270 DEG C, 2.5 hours heat time heating times；Soaking zone temperature controls at 1240 ~ 1260 DEG C, 3.5 hours heat time heating times；Total 20 hours heat time heating times；
During hydraulic pressure punching, being placed in by steel ingot in the interior mould 3 of hydraulic pressure perforating press, with drift 4 punching (as illustrated in figures 4-5), obtain external diameter 980mm, tapering is the bottle base 5 of 0.95 °, the metal of bottle base 5 overcharges full scale 4.3% ~ 10.7%；
During big tube reducing perforation, bottle base 5 tapered roller 6 and top 7 oblique milling big tube reducing perforation are obtained hollow billet 8(as shown in fig. 6-7), overall diameter reduction ratio is 14.3%, ovality is 1.05, rolling angle is-2 °, reducing rate 12.3%, after tube reducing perforation, hollow billet 8 external diameter is 860 mm, the big 10mm of relatively pipe die female end external diameter (850 mm)；
nullDuring cycle tube rolling，As seen in figs. 8-10，The roll 10 utilizing cycle pipe mill carries out forging rolling to hollow billet 8，Retain Pierre's wresting of self-assembling formation，Ensure that Pierre's wresting has rational allowance，Avoid raw-material waste，Design cycle Tube Rolling Train Φ 740mm macroporous type，Including forging rolling section、Finish rolling section、Finish to gauge section and the curvilinear equation of shallow pass section，Wherein forging rolling section is envelope、Forging rolling section initial angle is 25 °，Forging rolling section angle is 90 °，Forging rolling section curve length of run scope is 770mm，Control roll rotational speed 25rpm，Blast 5.3bar，Feed people and measure 70mm，Cycle tube rolling retains the long hollow billet of 180mm and do not roll latter stage，For taking horizontal sample and the processing of pipe die female end，With plug 9 and roll 10, one end of hollow billet 8 is rolled into hollow forging 11，Other end self-assembling formation Pierre's wresting 12，Thus form die blank；
During heat treatment, modifier treatment is carried out with regard to die blank, hardening heat: 880 DEG C, temperature retention time 70min, temperature: 620 DEG C, temperature retention time 160min, obtain high-strength tenacity tempered sorbite tissue；
Physical and chemical inspection: for fully inspection die blank performance, respectively staying at die blank two ends 70～120 surpluses to do horizontal mechanical performance and measure, the comprehensive mechanical property of assessment die blank meets the requirement of international standard；
Remaining method is identical with embodiment one.
Embodiment three:
A kind of method using steel ingot big diameter-reducing formation DN1200 type die blank, polish qualified including ingot smelting, steel ingot reinspection, annular furnace heating, hydraulic pressure punching, the perforation of big tube reducing, cycle tube rolling, artificial initial survey, aligning, thick machining, ultrasonic examination, heat treatment, physical and chemical inspection, magnetic powder inspection, artificial recheck, packaging is put in storage；
When steel ingot is rechecked, the circumscribed circle diameter D of the rib 2 of steel ingot body 1 periphery is 1650mm, and steel ingot circumscribed circle diameter D is compared with the big 40mm of inscribed circle diameter d of rib 2, i.e. D=d+40 mm, the quantity of rib 2 is 18 limits, and range of taper is 1.9 °, pipe die minimum compression ratio u(rolling ratio) be 3.3(female end)；
During annular furnace heating, using annular furnace by Heating Steel Ingots to hydraulic pressure punching extrusion temperature 1180 DEG C, when steel ingot enters stove, preheated one-section is not more than 720 DEG C, 12 hours heat time heating times；Preheating two-stage nitration temperature controls at 810 ~ 830 DEG C, 3 hours heat time heating times；Heat one section of temperature and control at 900 ~ 920 DEG C, 3 hours heat time heating times；Heating two-stage nitration temperature controls at 1030 ~ 1050 DEG C, 3 hours heat time heating times；Heat three sections of temperature and control at 1130 ~ 1150 DEG C, 3 hours heat time heating times；Heat four sections of temperature and control at 1250 ~ 1270 DEG C, 5 hours heat time heating times；Soaking zone temperature controls at 1240 ~ 1260 DEG C, 7 hours heat time heating times；Total 36 hours heat time heating times；
During hydraulic pressure punching, being placed in by steel ingot in the interior mould 3 of hydraulic pressure perforating press, with drift 4 punching (as illustrated in figures 4-5), obtain external diameter 1670mm, tapering is the bottle base 5 of 1.25 °, the metal of bottle base 5 overcharges full scale 5.6% ~ 8.5%；
During big tube reducing perforation, bottle base 5 tapered roller 6 and top 7 oblique milling big tube reducing perforation are obtained hollow billet 8(as shown in fig. 6-7), overall diameter reduction ratio is 10.8%, ovality is 1.06, rolling angle is-3 °, reducing rate 5.4%, after tube reducing perforation, hollow billet 8 external diameter is 1579 mm, the big 10mm of relatively pipe die female end external diameter (1569 mm)；
nullDuring cycle tube rolling，As seen in figs. 8-10，The roll 10 utilizing cycle pipe mill carries out forging rolling to hollow billet 8，Retain Pierre's wresting of self-assembling formation，Ensure that Pierre's wresting has rational allowance，Avoid raw-material waste，Design cycle Tube Rolling Train Φ 1390mm macroporous type，Including forging rolling section、Finish rolling section、Finish to gauge section and the curvilinear equation of shallow pass section，Wherein forging rolling section is envelope、Forging rolling section initial angle is 25 °，Forging rolling section angle is 90 °，Forging rolling section curve length of run scope is 370mm，Control roll rotational speed 8rpm，Blast 5.5bar，Feed people and measure 80mm，Cycle tube rolling retains the long hollow billet of 180mm and do not roll latter stage，For taking horizontal sample and the processing of pipe die female end，With plug 9 and roll 10, one end of hollow billet 8 is rolled into hollow forging 11，Other end self-assembling formation Pierre's wresting 12，Thus form die blank；
During heat treatment, modifier treatment is carried out with regard to die blank, hardening heat: 880 DEG C, temperature retention time 130min, temperature: 620 DEG C, temperature retention time 300min, obtain high-strength tenacity tempered sorbite tissue；
Physical and chemical inspection: for fully inspection die blank performance, respectively staying at die blank two ends 70～120 surpluses to do horizontal mechanical performance and measure, the comprehensive mechanical property of assessment die blank meets the requirement of international standard；
Remaining method is identical with embodiment one.
The present invention utilizes the big end of steel ingot to manufacture the female end that pipe die is thicker relatively greatly, it is to avoid it is not enough that continuous casting billet manufactures pipe die female end compression ratio, and the problem of obdurability difference that pipe die female end causes due to deflection greatest differences with pipe shaft.Restriction due to continuous casting billet specification, it is impossible to produce DN 600 and the die blank of above specification, and steel ingot is not limited by specification.Unavoidably there is loose and shrinkage cavity in heavy caliber alloy continuous casting circular tube blank center, and steel ingot in casting cycle can feeding in time, center do not exist loose with shrinkage cavity etc. macrostructure defect, it is not required that pipe endoporus is carried out rough bore processing.
The present invention utilizes the feature that vertical water pressure perforating press deformation condition is good and deformability is strong, during hydraulic pressure punching, steel ingot deforms under the effect of three-dimensional compressive stress, therefore steel ingot center can be played the effect of compacting, and original thick columanar structure can obtain " crushing " after punching, so, pressure punching technique can be effectively improved the interior tissue of pipe, reduces the load of follow-up big tube reducing perforation process, also provides the second best in quality punching bottle base for follow-up big tube reducing perforation process.
The tapered roller of rolling angle born by band of the present invention, it is achieved 5% ~ 21% big reducing rate, it is ensured that without the rolling ratio of Pierre's wresting (female end) of cycle pipe mill rolling deformation in about 3 (scopes: 2.7 ~ 3.3).And graceful formula barrel roll perforating machine rolling angle is 0, reducing rate is less than 5%, it is typically with isometrical or micro-extension diameter perforation, for produce external diameter and blank quite and wall thickness at the hollow billet of about 100mm, compression ratio only about 1.4, (producing as a example by DN300 by continuous casting billet, be only 1.3 without the compression ratio of Pierre's wresting of cycle pipe mill rolling deformation, can not be improved by the internal structure that continuous casting billet is loose, even can more deteriorate), in use there is bigger potential safety hazard in female end.
The present invention passes through design cycle Tube Rolling Train Φ 390～Φ 1390mm macroporous type, controls the shape of Pierre's wresting, it is ensured that Pierre's wresting has rational allowance, it is to avoid raw-material waste.Utilize cycle pipe mill that hollow billet carries out forging rolling, retain Pierre's wresting of self-assembling formation, eliminate pipe die female end horn mouth moulding process, which not only improves utilization rate of raw materials and simplify Tube Mold Technology flow process simultaneously, improve production efficiency, shorten the production cycle, save cost.
Claims (4)
1. the method using steel ingot big diameter-reducing formation die blank, including ingot smelting, steel ingot recheck,
Annular furnace heating, hydraulic pressure punching, the perforation of big tube reducing, cycle tube rolling, artificial initial survey, aligning, thick machine add
Work, ultrasonic examination, heat treatment, physical and chemical inspection are qualified, polish, magnetic powder inspection, artificial recheck,
Packaging warehouse-in；It is characterized in that: during ingot smelting, ingot material is 21CrMo10, and strictly control phosphorus,
Sulfur, nitrogen, hydrogen, the content of oxygen, wherein phosphorus content is less than 0.008%, and sulfur content is less than 0.004%, and nitrogen contains
Amount is less than 2ppm less than 100ppm, hydrogen content, and oxygen content is less than 35ppm；When steel ingot is rechecked, steel ingot
The circumscribed circle diameter D of the rib of body peripheral is 660～1650mm, the circumscribed circle of the rib of steel ingot body peripheral
Diameter D is 16～24 limits compared with the big 40mm of inscribed circle diameter d of rib, i.e. D=d+40mm, the quantity of rib,
Range of taper is 1.6～2.5 °, and pipe die minimum compression ratio u is 2.7～3.3；The rib of body peripheral
Inscribed circle diameter d is as follows about the relational expression of minimum compression ratio u with pipe die female end external diameter H:
D × d=4 × u × S × (H+10-S), in formula, S is hollow billet wall thickness.
The method of employing steel ingot the most according to claim 1 big diameter-reducing formation die blank, its feature
It is: when steel ingot is rechecked, the circumscribed circle diameter D of the rib of steel ingot body peripheral is 660mm, and tapering is 2.2 °,
Pipe die minimum compression ratio u is 2.7.
The method of employing steel ingot the most according to claim 1 big diameter-reducing formation die blank, its feature
It is: when steel ingot is rechecked, the circumscribed circle diameter D of the rib of steel ingot body peripheral is 970mm, and tapering is 1.8 °,
Pipe die minimum compression ratio u is 3.0.
The method of employing steel ingot the most according to claim 1 big diameter-reducing formation die blank, its feature
It is: when steel ingot is rechecked, the circumscribed circle diameter D of the rib of steel ingot body peripheral is 1650mm, and tapering is 1.9 °,
Pipe die minimum compression ratio u is 3.3.
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| CN101020190A (en) * | 2007-03-21 | 2007-08-22 | 中冶东方工程技术有限公司 | Hot rolling process of seamless steel pipe |
| CN101439350A (en) * | 2008-12-19 | 2009-05-27 | 攀钢集团成都钢铁有限责任公司 | Method for producing seamless steel pipe for producing gas cylinder with heavy caliber for hauled vehicle |
| CN101579703A (en) * | 2009-06-17 | 2009-11-18 | 刘怀文 | New technique for manufacturing high alloy steel seamless pipe with heavy calibre by adopting pilger mill |
| CN102179681A (en) * | 2011-03-30 | 2011-09-14 | 盛泽能源技术有限公司 | Pipe mold manufacturing process adopting continuous-casting blank to forge and roll rough blank periodically |
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