CN103949890A - Q420 large angle steel producing and processing technology - Google Patents

Q420 large angle steel producing and processing technology Download PDF

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Publication number
CN103949890A
CN103949890A CN201410040600.0A CN201410040600A CN103949890A CN 103949890 A CN103949890 A CN 103949890A CN 201410040600 A CN201410040600 A CN 201410040600A CN 103949890 A CN103949890 A CN 103949890A
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CN
China
Prior art keywords
angle steel
steel
rolling
finished
processing technology
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410040600.0A
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Chinese (zh)
Inventor
鲁景星
俞彦
黄昆
任成林
李俊华
黄宇
舒礼臣
胡蓉
蔡永梁
付诗禧
王勇
黄文泽
王国龙
张延镇
辜良雨
肖兵
肖洪伟
邱成波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guizhou electric power design institute
SUPER-HIGH TRANSMISSION Co CHINA SOUTH ELECTRIC-NET Co Ltd
Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group
Original Assignee
Guizhou electric power design institute
SUPER-HIGH TRANSMISSION Co CHINA SOUTH ELECTRIC-NET Co Ltd
Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guizhou electric power design institute, SUPER-HIGH TRANSMISSION Co CHINA SOUTH ELECTRIC-NET Co Ltd, Southwest Electric Power Design Institute Co Ltd of China Power Engineering Consulting Group filed Critical Guizhou electric power design institute
Priority to CN201410040600.0A priority Critical patent/CN103949890A/en
Publication of CN103949890A publication Critical patent/CN103949890A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P13/00Making metal objects by operations essentially involving machining but not covered by a single other subclass
    • B23P13/02Making metal objects by operations essentially involving machining but not covered by a single other subclass in which only the machining operations are important

Abstract

The invention relates to the processing technology of high-strength angle steel, and provides a Q420 large angle steel producing and processing technology capable of improving the precision of finished angle steel products and ensuring the mechanical properties of the finished angle steel products to the maximum extent. The producing and processing technology comprises the following steps: (1) selecting 220*160, 280*170, 300*200 or 360*240 billets to enter a furnace for heating; (2) rough rolling and finish rolling the billets by using a phi 850 mill and a phi 800 respectively, and rolling 10 to 12 passes in accordance with a butterfly pass system; (3) cutting the finished product with a hot saw into equilateral angle steel with a side length of 220mm to 250mm and a thickness of 16mm to 35mm; (4) the angle steel adopting a saw belt type sawing machine to blank; (5) drilling holes in the angle steel. The processed angle steel of large specification has a side length of 220mm to 250mm and a thickness of 16mm to 35mm, and no positive or negative deviation of angle steel rolling exists, so that the use strength of the angle steel is effectively ensured; the saw belt type sawing machine is used for blanking, so that the steel components at the end head of the angle steel are less damaged; the angle steel is drilled to make holes, so that the precision of the finished angle steel product is effectively improved.

Description

The large angle steel production and processing technology of Q420
Technical field
The present invention relates to the process technology of high-strength corner iron, particularly large specification angle steel production and processing technology for a kind of iron tower of power transmission line.
Background technology
For a long time, China's iron tower of power transmission line steel used are confined to Q235 and two kinds of strength grades of Q345, and angle steel maximum specification is L200X24.Compared with developed countries, kind is few, and intensity level is on the low side, and the angle steel that exceedes L200X24 specification need to be used double angle compound section.Existing Q235, Q345 angle steel specification are less, and production and processing technology precision is lower, and angle steel rolling allows to exist positive and negative deviation, cannot ensure to greatest extent angle steel mechanical characteristic.
Summary of the invention
The invention provides the large angle steel production and processing technology of Q420, improved for original technique, improve the precision of angle steel finished product and ensure to greatest extent its mechanical characteristic.
For achieving the above object, the present invention takes following technical scheme:
The large angle steel production and processing technology of Q420, comprises the steps:
(1) choose 220 × 160,280 × 170,300 × 200 or 360 × 240 steel billets and enter stove heating;
(2) Φ 850 milling trains carry out roughing to steel billet, according to 5~7 passages of butterfly hole type system rolling;
(3) Φ 800 first milling trains carry out finish rolling to steel material, according to 3 passages of butterfly hole type system rolling;
(4) Φ 800 second rolling mills carry out finish rolling to steel material, according to 1 passage of butterfly hole type system rolling;
(5) Φ 800 finishers are by steel rolling finished product, according to 1 passage of butterfly hole type system rolling;
(6) finished product hot saw is cut into length of side 220mm~250mm, the equal leg angle of thickness 16mm~35mm;
(7) angle steel adopts saw band formula, sawing machine blanking;
(8) angle steel drilling adopts boring.
The large specification angle steel that the present invention is processed into, length of side 220mm~250mm, thickness 16mm~35mm, there is not positive and negative deviation in angle steel rolling, has effectively ensured the working strength of angle steel; Adopt saw band formula, sawing machine blanking, otch (face) is smooth, angle steel angular edge complete display, section perpendicularity is good, the steel composition of angle steel termination is destroyed few, also can not have the internal stress of termination without heat affected area, guarantees that angle steel termination organizes complete; Angle steel drilling all adopts boring, has effectively improved angle steel finished product accuracy.
Detailed description of the invention
Below in conjunction with embodiment, content of the present invention is described further.
The large-size high-tensile degree angle steel that the present invention processes is Q420B, comprises L220X16, L220X18, L220X20, L220X22, L220X24, L220X26, L250X18, L250X20, L250X24, L250X26, L250X28, L250X30, L250X32, the L250X35 equal leg angle of totally 14 specifications.Equal leg angle adopts butterfly hole type system, and according to different size rolling 10~12 passages, finished product adopts open type, strengthens its commonality.The angle pass rolling mechanism of the different length of sides is as follows:
The length of side is that 220mm equal leg angle is divided into thickness two cover systems, and 16~22mm thickness is a set of, and 22~26mm thickness is a set of; Φ 850 milling trains and finisher roll share, and divide open cell type from K5~K2 passage, and Φ 800 milling train firsts (K5~K3), Φ 800 milling train second (K2) are separately.
The length of side is that 250mm equal leg angle is divided into thickness two cover systems, and each rolling mill roll all separates, and 18~24mm thickness is a set of, and 26~35mm thickness is a set of; Considering the greatest differences between 26~35mm thickness, separate K2 pass in 26~35 thickness passes, is according to joining separately a K2 hole by finished product 30mm thickness.
The chemical composition of angle steel is carried out GB/T1591-2008 standard, concrete inner quality standard reference document QF/LT/DL120 " Q345B smelts continuous casting operating procedure main points " and QF/LT/DL130 " Q420B smelts continuous casting operating procedure main points ".GB and southern net angle steel adopt the regulation of GB/T1591-2008 standard to carry out batching, allow batching rolling; The large specification angle steel of state's network mark standard must send steel by stove, mustn't mix batching.
The present invention includes the processing technology of steel and the processing technology of angle steel:
1, the processing technology of steel
Steel billet → heating → high-pressure water descaling → Φ 850 milling train breaking down → high-pressure water descaling → Φ 800 milling train finish rolling → high-pressure water descaling → Φ 800 milling train finish rolling → high-pressure water descaling → finisher rolling → hot saw → red inspection → cold beds are cooling → surface quality testing → aligning → final inspection → packaging → cold saw scale → mark → warehouse-in.
Blank: adopt 220 × 160,280 × 170,300 × 200 or 360 × 240 blanks.
Heating: heating-up temperature is 1150 DEG C~1350 DEG C, and the heat time is 2.5 hours, 1150 DEG C of steel billet tapping temperatures.
The high-pressure water descaling of coming out of the stove: ensure the important step of finished surface quality, the high-pressure water descaling pressure of coming out of the stove is 22MPa.
850 mill millings: steel billet is carried out to roughing, make steel billet possess finished product blank, 5~7 passages of rolling.
High-pressure water descaling after 850 milling trains: de-scaling pressure 22MPa, ensures that the billet surface before finish rolling is good.
800 first mill millings: steel material is carried out to finish rolling, altogether 3 passages of rolling.
800 first milling train high-pressure water descalings: by finishing pass being carried out to 1 de-scaling, de-scaling pressure is 22MPa.
800 second rolling mill rollings (milling train before finished product): steel material is carried out to finish rolling, altogether 1 passage of rolling.
Milling train high-pressure water descaling before finished product: de-scaling pressure is 22MPa.
800 finisher rollings: steel rolling is become to qualified finished product, passage of rolling.
Thick sawing of hot saw: rolling finished steel sawing is out become to user's length of ordering goods.
Red inspection: the finished steel good to sawing carries out dimension control, comprises inspection surface quality, size.
Cooling: to carry out cooling to red steel.
Rough Inspection: the steel that cool down are tested, surface quality and each spot size of inspection steel.
Aligning: steel are aligned.
Product inspection: every steel are tested, carefully check surface quality and each spot size of every steel.
Packaging: press specification, rolling lot number by packaging steel.
2, the processing technology of angle steel
(1) control with raw material
Except the assays such as due Interventions Requested, presentation quality, specification, tolerance, mechanical property and chemical element meet the regulation of GB/T1591, GB9787 and relevant criterion, within also the natural deflection degree of steel (comprising angle steel, steel plate) must being controlled to L/1000 as far as possible, the Baogang joint on angle steel top, drift angle tolerance is controlled at ± 35 ' within.
(2) material blanking
A. more than angle steel thickness >=16mm, adopt saw band formula, sawing machine blanking;
B. do not adopt flame cutting, the steel composition of angle steel termination is destroyed few, can not have the internal stress of termination without heat affected area yet, guarantee that angle steel termination organizes complete;
C.Q420B steel plate cutting, is used Kyle, Germany shellfish (class laser) CUT blanking, otch roughness Ra≤12.5, and an otch perpendicularity≤2 ° kerf quality reaches laser cut quality lower limit, and the common plasma of cut lengths ratio of precision is high 1 times.
(3) drilling processing
Q420B member all adopts boring.
(4) make curved processing
AK872 infrared thermometer control for heater block temperature, can effectively control the processing temperature region of workpiece.According to bending angle processed, the mode difference of interior curved, excurvation, meet system curved after, attenuate amount thickness is no less than under the prerequisite of original thickness 80%, takes as far as possible heating naturally to make with bulldozer curved, but can not meet under the prerequisite of thickness requirement, can select scarfing system curved.
(5) group is to, welding processing
Except execution meet group to technique for welding, also must carry out following control measure:
A. group is to reversible deformation measure;
B. electric welding shrinkage direction, amount of contraction are being organized the control measure of centering;
C. the control measure of the impact of electric welding order on welded plate distortion;
D. weld pre-treating technology and weld interpass temperature control measure;
E. detect (selecting depending on workpiece situation) with x-ray ray light and nondestructive inspection, guarantee the feasibility of technological measure.
(6) zincincation control
A. adopt that mature and stable to help plating proportioning and zinc liquid proportioning be zinc-plated basis, guarantee the tack that zinc layer is good;
B. the zinc liquid temperature that choose reasonable is suitable mates with zinc part thickness, guarantees that zinc layer is controlled at compared with zone of reasonableness, not only economy but also meet the requirements;
C. control well into plating piece quantity, adopt special operating procedure, shorten as far as possible into the plating time, and can reach galvanizing quality requirement, the selection plating piece suspension centre, the hanging point that hold water, guarantee zinc-plated be heated catch a cold relatively even;
D. select reasonably turnover zinc pot and the cooling work angle of lower flume, to control the possibility of plating piece distortion;
E. select rational coolant water temperature and cool time.

Claims (1)

  1. The large angle steel production and processing technology of 1.Q420, is characterized in that:
    Comprise the steps:
    (1) choose 220 × 160,280 × 170,300 × 200 or 360 × 240 steel billets and enter stove heating;
    (2) Φ 850 milling trains carry out roughing to steel billet, according to 5~7 passages of butterfly hole type system rolling;
    (3) Φ 800 first milling trains carry out finish rolling to steel material, according to 3 passages of butterfly hole type system rolling;
    (4) Φ 800 second rolling mills carry out finish rolling to steel material, according to 1 passage of butterfly hole type system rolling;
    (5) Φ 800 finishers are by steel rolling finished product, according to 1 passage of butterfly hole type system rolling;
    (6) finished product hot saw is cut into length of side 220mm~250mm, the equal leg angle of thickness 16mm~35mm;
    (7) angle steel adopts saw band formula, sawing machine blanking;
    (8) angle steel drilling adopts boring.
CN201410040600.0A 2014-01-27 2014-01-27 Q420 large angle steel producing and processing technology Pending CN103949890A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410040600.0A CN103949890A (en) 2014-01-27 2014-01-27 Q420 large angle steel producing and processing technology

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410040600.0A CN103949890A (en) 2014-01-27 2014-01-27 Q420 large angle steel producing and processing technology

Publications (1)

Publication Number Publication Date
CN103949890A true CN103949890A (en) 2014-07-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107414433A (en) * 2017-09-14 2017-12-01 河南鼎力杆塔股份有限公司 A kind of Huo Qu Baogangs processing method of angle steel tower

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JP2000042640A (en) * 1998-07-28 2000-02-15 Daido Steel Co Ltd Manufacture of stainless steel angle and its manufacturing device
CN101214514A (en) * 2008-01-02 2008-07-09 嘉兴市华杰机械有限公司 Corner iron shaping method, corner iron manufacturing method and corner iron shaping equipment
CN102247981A (en) * 2011-06-01 2011-11-23 中冶赛迪工程技术股份有限公司 Structural steel rolling production line and production process thereof
CN102851585A (en) * 2012-04-20 2013-01-02 宿迁南钢金鑫轧钢有限公司 Niobium-containing large-sized high-strength angle iron and production technology thereof

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Publication number Priority date Publication date Assignee Title
US4173073A (en) * 1977-05-25 1979-11-06 Hitachi, Ltd. Track displacement detecting and measuring system
CN1153487A (en) * 1994-07-19 1997-07-02 住友金属工业株式会社 Rolling mill for producing angle steel from hoop steel and method for rolling angle steel using rolling mill
JP2000042640A (en) * 1998-07-28 2000-02-15 Daido Steel Co Ltd Manufacture of stainless steel angle and its manufacturing device
CN101214514A (en) * 2008-01-02 2008-07-09 嘉兴市华杰机械有限公司 Corner iron shaping method, corner iron manufacturing method and corner iron shaping equipment
CN102247981A (en) * 2011-06-01 2011-11-23 中冶赛迪工程技术股份有限公司 Structural steel rolling production line and production process thereof
CN102851585A (en) * 2012-04-20 2013-01-02 宿迁南钢金鑫轧钢有限公司 Niobium-containing large-sized high-strength angle iron and production technology thereof

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刘泽洪: "《大规格角钢在输电铁塔中的应用》", 30 November 2011, 北京:中国电力出版社 *
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107414433A (en) * 2017-09-14 2017-12-01 河南鼎力杆塔股份有限公司 A kind of Huo Qu Baogangs processing method of angle steel tower

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