CN101787492B - Manufacturing method of high quality and large size mandril blank - Google Patents
Manufacturing method of high quality and large size mandril blank Download PDFInfo
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- CN101787492B CN101787492B CN2010101264742A CN201010126474A CN101787492B CN 101787492 B CN101787492 B CN 101787492B CN 2010101264742 A CN2010101264742 A CN 2010101264742A CN 201010126474 A CN201010126474 A CN 201010126474A CN 101787492 B CN101787492 B CN 101787492B
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Abstract
The invention relates to a manufacturing technology of a high quality and large size mandril blank, and belongs to the technical field of steel bar product manufacturing process. The invention relates to the manufacture technology of a major diameter mandril of which the diameter is more than 300mm. The invention is characterized in that large-tonnage forging and large steel ingot multiterm forging are adopted to realize the molding of the mandril blank. The invention adopts a reasonable process system to realize the effective improvement of mandril segregation and loose defects, and realizes the effective control of a microscopic structure. In the manufacturing process, the invention strengthens the uniformity of steel ingot alloy structure before forging, and strengthens the post cooling degree of the mandril blank after forging and structure refining heat treatment, thereby improving various properties including the hardness of the mandril blank product.
Description
Technical field
The present invention relates to a kind of method of manufacture of high quality and large size mandril, belong to iron and steel bar goods manufacturing process technology field.
Technical background
Plug is and the roll acting in conjunction pipe after the perforation to be rolled into the weldless steel tube of various size.It is different to press the steel pipe rolling mode, can be divided into floating core rod, half retained mandrel and retained mandrel, and wherein, the retained mandrel proportion is maximum.
Retained mandrel tandem rolling pipe production technique is to be difficult to solve under the situation of producing the above steel pipe of external diameter 177.8mm in floating core rod tandem rolling pipe production technique grow up.The retained mandrel tandem rolling tube machine carried out technological test and has obtained gratifying achievement in middle 1960s; The first cover retained mandrel continuous rolling-tube unit (MPM) in the world that was manufactured and designed by Italian Yin Xi company in 1978 is constructed and put into operation in Italian Da Er exposed penstock factory, indicates that continuously rolling process realized breakthrough progress; The mid-90 in 20th century has been released three roller retained mandrel tandem rolling tube machine (PQF) technology again, makes the continuously rolling process equipment jump onto a new peak.Retained mandrel tandem rolling Manifold technology becomes the main flow of current hotrolling seamless pipe production technology development.
In the tandem rolling tube machine wroughtsteel pipe process, plug is directly pushing high temperature pipe inwall, and at this moment plug is bearing huge squeeze and intensive thermal shocking, and the mandrel surface transient temperature can reach 700 ℃, rolling after water spray cooling immediately, temperature sharply descends again.In the entire work process, mandrel surface is bearing very complicated periodic racking stress, frictional force and high-intensity thermal shock.Under periodic thermal load and mechanical load function, the same with other hot-work die, the thermal fatigue be full of cracks is its most typical failure mode.Hard point and external hard impurity get into the appearance that working interface will cause the defectives such as machinery scuffing, groove of mandrel surface in the peeling off of mandrel surface chromium coating, the pipe tissue.In addition, the flake-off piece that causes of factors such as the local plastic deformation of mandrel surface, heat crack also is typical plug failure behaviour.
Plug generally adopts H13 steel or its modified form steel grade manufacturing both at home and abroad, and the structure property of steel is this quality factor in decision plug life-span.The subsurface defect of steel is destroyed the continuity of matrix, thereby reduces the life-span and the use properties of plug; These defectives mainly comprise various inclusiones, eutectic carbides, segregation etc.After steel ingot maximizes, the problems referred to above will be more outstanding.And, the H13 steel of current high cleanliness, sulfide is less, and at this moment eutectic carbides becomes the main faults source.So the control of carbide also is a considerable technology in the high-quality H13 steel.
Summary of the invention
The method of manufacture that the purpose of this invention is to provide a kind of high quality and large size mandril.
The method of manufacture of a kind of high quality and large size mandril of the present invention is characterized in that having following process and step:
A. design and select the Chemical Composition of steel grade: the chemical ingredients and the weight percent of this steel grade are following: C0.30～0.38%, and Si 0.70～1.00%, and Mn 0.20～0.60%; Cr 4.50～5.50%, and Mo 1.00～1.50%, and V 0.80～1.10%; P＜0.015%; S＜0.005%, Fe surplus, control impurity content.Put into smelting furnace after the batching, carry out melting.The alloying constituent that makes tapping is near the target value lower limit.
B. electrosmelting: carry out melting by traditional ordinary method.To inject electric arc furnace by the admixtion of above-mentioned formulated and carry out melting, smelting temperature is 1500～1550 ℃;
C. vacuum refinement and esr: intensification desulfurization vacuum outgas, improve purity, the adjustment alloying constituent reaches target value; The electrode bar that smelting and pouring is gone out is put in the esr device, carries out esr; Electroslag adopts the ternary slag system:
CaF2: Al2O3: CaO=60: 20: 20; Remelt speed is controlled at 10-20kg/min.
D. high temperature homogenization is handled; Steel ingot behind the esr is heated to 1200～1280 ℃ carries out the high temperature homogenization processing, be incubated 15-20 hour, component segregation is eliminated by uniform formation, buries sand cooling then but.
E. forge; Above-mentioned steel ingot is heated in 1100～1200 ℃ of TRs forges processing; Forge and divide the 3-6 fire to accomplish, the mushrooming deformation amount is 30-60%, middle pulling amount 300%-600%, and last fire together pulls out to target size, and forging ratio remains on 4-8.Final forging temperature is between 1050 ℃-900 ℃.Be chilled to 200-400 ℃ after the forging soon.
F. high temperature solid solution: forge the back sample at 950～1150 ℃ of insulations, air cooling after soaking time 2-4 hour.
G. Spheroidizing Annealing: steel carry out the two-section type isothermal spheroidizing after forging.830～880 ℃ of insulations 10 hours, stove was cold;
Then 700～740 ℃ of insulations 3 hours, stove was cold; Speed of cooling is 20～40 ℃/h, the air cooling of in the time of≤400 ℃, coming out of the stove, and annealing time is 15-18 hour, finally makes high-quality plug.
Method of manufacture characteristics of the present invention are: through rational metallurgical quality control techniques and heat treatment technics, accurately control composition and forging ratio, the heat treatment process accurate temperature controlling has been realized the even control to composition, tissue effectively simultaneously.The composition uniformity of final plug of the present invention surpasses the level in kind of import plug, and homogeneity of structure reaches import plug level.
Description of drawings
Fig. 1 is the micro-organization chart of electroslag process plug ESR ingot of the present invention.
Fig. 2 is the micro-organization chart of the present invention behind high-temperature homogenization.
Fig. 3 is the microstructure after high temperature solid solution of the present invention and the Spheroidizing Annealing.
Embodiment
Specific embodiment of the present invention is described in down at present.
Embodiment: in this instance, adopt the moity and the weight percent thereof of steel grade following:
The process for making of large size mandril and step are following in this instance:
A. in electric arc furnace, carry out melting by the alloying element proportioning of above-mentioned formulated, smelting temperature then is cast into Φ 900mm steel ingot and air cooling greater than 1500 ℃;
B. the desulfurization vacuum outgas that heats up, the adjustment alloying constituent reaches target value; The ESR ingot that the melting pouring is gone out is put in the esr device, carries out esr, and liquid metal falls in the following water mold through the slag blanket of slag bath, is frozen into steel ingot more again; Remelt speed is controlled at 10-20kg/min.
C. the steel ingot behind the esr is heated to 1250 ℃ and carries out the high temperature homogenization processing, be incubated 18 hours, component segregation is eliminated by uniform formation, buries sand cooling then but.
D. above-mentioned steel ingot is heated to 1200 ℃, comes out of the stove then and forge processing; Forge and divide the 3-6 fire to accomplish, the mushrooming deformation amount is 30-60%, middle pulling amount 300%-600%, and last fire together pulls out 358.1 * 13200mm to Φ.Final forging temperature is about 1000 ℃.Be chilled to 200-400 ℃ after the forging soon.
E. high temperature solid solution: forge the back sample at 950～1150 ℃ of insulations, air cooling after soaking time 2-4 hour.
F. carry out Spheroidizing Annealing after the material solid solution.880 ℃ * 10h/ stove cold+710 ℃ * 3h/ stove is cold≤40 ℃/h ,≤500 ℃ of air coolings of coming out of the stove. annealing time is 15-18 hour, finally makes high-quality plug.
Plug of the present invention carries out performance test and microscopic examination through after the above-mentioned thermal treatment, and the result is described below:
(1) quenching hardness: 53HRC; Tempered-hardness: 47.5HRC
(2) annealed state hardness: HB 200-260
(3) microstructure behind the high-temperature homogenization (like accompanying drawing 2), after this process high-temperature homogenizing was handled, large particle carbide was eliminated fully, and without having macrobead pseudoeutectic carbide in the plug of handling that homogenizes.
(4) microstructure after high temperature solid solution and the Spheroidizing Annealing, shown in accompanying drawing 3, carbide is tiny to be evenly distributed on the ferrite matrix.Among the present invention, the microstructure of electroslag process plug ESR ingot is shown among Fig. 1
Claims (1)
1. the method for manufacture of a large size mandril is characterized in that having following process and step:
A. design and select the Chemical Composition of steel grade: the chemical ingredients and the weight percent of this steel grade are following: C0.30～0.38%, and Si 0.70～1.00%, and Mn 0.20～0.60%; Cr 4.50～5.50%, and Mo 1.00～1.50%, and V 0.80～1.10%; P＜0.015%; S＜0.005%, Fe surplus, control impurity content; Put into smelting furnace after the batching, carry out melting; The alloying constituent that makes tapping is near the target value lower limit;
B. electrosmelting: carry out melting by traditional ordinary method; To inject electric arc furnace by the admixtion of above-mentioned formulated and carry out melting, smelting temperature is 1500～1550 ℃;
C. vacuum refinement and esr: intensification desulfurization vacuum outgas, improve purity, the adjustment alloying constituent reaches target value; The electrode bar that smelting and pouring is gone out is put in the esr device, carries out esr; Electroslag adopts the ternary slag system:
CaF
2: Al
2O
3: CaO=60: 20: 20; Remelt speed is controlled at 10-20kg/min;
D. high temperature homogenization is handled; Steel ingot behind the esr is heated to 1200～1280 ℃ carries out the high temperature homogenization processing, be incubated 15-20 hour, component segregation is eliminated by uniform formation, buries sand cooling then but;
E. forge; Above-mentioned steel ingot is heated in 1100～1200 ℃ of TRs forges processing; Forge and divide the 3-6 fire to accomplish, the mushrooming deformation amount is 30-60%, middle pulling amount 300%-600%, and last fire together pulls out to target size, and forging ratio remains on 4-8; Final forging temperature is between 1050 ℃-900 ℃; Be chilled to 200-400 ℃ after the forging soon;
F. high temperature solid solution: forge the back sample at 950～1150 ℃ of insulations, air cooling after soaking time 2-4 hour;
G. carry out Spheroidizing Annealing after the material solid solution: steel carry out the two-section type isothermal spheroidizing after forging; 830～880 ℃ of insulations 10 hours, stove was cold; Then 700～740 ℃ of insulations 3 hours, stove was cold; Speed of cooling is 20～40 ℃/h, the air cooling of in the time of≤400 ℃, coming out of the stove, and annealing time is 15-18 hour, finally makes plug.
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| CN2010101264742A CN101787492B (en) | 2010-03-17 | 2010-03-17 | Manufacturing method of high quality and large size mandril blank |
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| CN101787492B true CN101787492B (en) | 2012-05-23 |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102373376B (en) * | 2010-08-18 | 2013-06-26 | 宝山钢铁股份有限公司 | High-silicon high-manganese hot-work die steel and preparation method thereof |
| CN102212756A (en) * | 2011-05-04 | 2011-10-12 | 上海大学 | Chromium-molybdenum-vanadium hotwork tool-die steel and heat treatment process thereof |
| CN102329947A (en) * | 2011-09-08 | 2012-01-25 | 上海市机械制造工艺研究所有限公司 | Thermal treatment process of homogenizing and fine graining of steel carbide of hot die |
| CN103243271A (en) * | 2013-05-09 | 2013-08-14 | 内蒙古北方重工业集团有限公司 | Preparation method of high-toughness drilling tool |
| CN103572022B (en) * | 2013-11-07 | 2015-05-13 | 大冶特殊钢股份有限公司 | Heat-treatment method for H13 section steel |
| CN106378365B (en) * | 2016-09-07 | 2018-07-17 | 重庆科技学院 | The preparation method of GH625 high temperature alloy pipes |
| CN106566914A (en) * | 2016-11-02 | 2017-04-19 | 北京科技大学 | Heat treatment method for tool and mould steel obtained after electroslag remelting continuous directional solidification |
| CN107541591B (en) * | 2017-08-29 | 2019-11-15 | 西安汇丰精密合金制造有限公司 | A kind of manufacturing method of super electromagnetic pure iron DT4C bar |
| CN108103288B (en) * | 2017-12-15 | 2019-08-02 | 河冶科技股份有限公司 | The preparation method and seamless steel pipe plug of seamless steel pipe plug |
| CN108251652B (en) * | 2017-12-22 | 2019-11-29 | 宝钢轧辊科技有限责任公司 | Forged Cold Roll Blank regeneration method is scrapped using electroslag remelting realization |
| CN109517949B (en) * | 2018-12-12 | 2020-10-30 | 河钢股份有限公司承德分公司 | Spheroidizing annealing method of steel for shafts |
| CN109487052B (en) * | 2018-12-12 | 2020-10-30 | 河钢股份有限公司承德分公司 | Spheroidizing annealing method of B-containing cold forging steel |
| CN109628713B (en) * | 2018-12-12 | 2020-11-06 | 河钢股份有限公司承德分公司 | Spheroidizing annealing method of low-carbon steel |
| CN109593929B (en) * | 2018-12-12 | 2020-10-30 | 河钢股份有限公司承德分公司 | Spheroidizing annealing method of cold forging steel |
| CN111558680B (en) * | 2020-06-22 | 2021-12-21 | 无锡派克新材料科技股份有限公司 | Manufacturing method of large-section F53 solid forging |
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| CN1086965C (en) * | 1999-10-19 | 2002-07-03 | 赵士英 | Technology for manufacturing mandrel used to roll seamless steel tube |
| CN100519813C (en) * | 2007-12-06 | 2009-07-29 | 上海大学 | High-strength toughness cold working die steel and method of producing the same |
| CN101619421A (en) * | 2008-07-02 | 2010-01-06 | 胡涛起 | High -toughness hot working die steel |
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