CN110153346A - A kind of method of the forging rolling duplex technique production long material of steel alloy big cross section - Google Patents

A kind of method of the forging rolling duplex technique production long material of steel alloy big cross section Download PDF

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Publication number
CN110153346A
CN110153346A CN201810280376.0A CN201810280376A CN110153346A CN 110153346 A CN110153346 A CN 110153346A CN 201810280376 A CN201810280376 A CN 201810280376A CN 110153346 A CN110153346 A CN 110153346A
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China
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forging
rolling
steel
temperature
big
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CN201810280376.0A
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Chinese (zh)
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韩建淮
徐卫明
顾金才
陈子坤
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钢铁研究总院淮安有限公司
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Priority to CN201810280376.0A priority Critical patent/CN110153346A/en
Publication of CN110153346A publication Critical patent/CN110153346A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B15/00Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007Cutting or shearing the product
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74Temperature control, e.g. by cooling or heating the rolls or the product
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002Hybrid process, e.g. forging following casting

Abstract

The present invention provides a kind of method of forging rolling duplex technique production long material of steel alloy big cross section, by the way that raw material is heated, is forged, controlled rolling, cooling and examination and test of products process, forging and stamping machining distortion ability and center portion seepage deformation ability is utilized, the plastic processing deformation ability of high-precision rolling mill precise forming is utilized again, produces the high steel alloy big cross section pole material of inside solid degree height, any surface finish, dimensional accuracy;Flexibly using less than Ф 1000mm and basal area phase equal-specification large round billet or with the forging stock of equal section and continuous casting billet, caststeel ingot blank, without being limited by capacity of equipment, production be less than Ф 800mm and the equal shape specification product group of basal area away from surface, the excellent section configuration of internal soundness steel;By the plastic deformation and forging center portion seepage deformation of big compression ratio, big cross section steel inside solid degree is high, good mechanical performance, any surface finish, and dimensional accuracy is high.

Description

A kind of method of the forging rolling duplex technique production long material of steel alloy big cross section

Technical field

The present invention relates to steel alloy big cross section pole materials and the long material production method of cross-section fashioned iron, and in particular to one kind The method that forging rolling duplex technique produces the long material of steel alloy big cross section, belongs to steel material manufacture field.

Background technique

Existing Forging Technology are as follows: acceptable material, heating, forging, cooling (heat treatment), room temperature, metal cutting process, product It examines.

Existing rolling mill practice are as follows: acceptable material, heating, hot rolling, cooling (heat treatment), room temperature, the examination and test of products.

Traditional two igneous material of forging+hot rolling, be respectively adopted Forging Technology and rolling mill practice production steel there are the production cycles The deficiencies of long, energy consumption is high, and the poor product quality that recovery rate of iron is low, different process produces is anisotropic big.Light section forging is needed Heating for multiple times forging, especially special steel forgings are also easy to produce crackle and cause scrap of the product;Rolling mill practice produces big cross section steel There are the deficiencies of quality improvement difference for center portion.

, inevitably there is forging and stamping trace in the long material surface irregularity of conventional forging process production, dimensional accuracy cannot have Effect control improves surface quality by metal cutting peeling, and metal loss is high, and production efficiency is low, at high cost and not environmentally;Rolling Although the long material surface quality of technique production is good, mostly limited by blank specification and roll-force center portion penetrating power difference, it can only Produce small dimension high performance steel, the shrinking hole remnant of big cross section rolled piece center portion, it is loose the defects of cannot be effectively improved, steel Internal soundness is poor.

Conventional swaging processes, forging cooling procedure easily form crackle at malleation, and high-alloy steel is in forging and stamping and cooling procedure In, it is easy to cause to crack at malleation.

Existing disclosed forging rolling duplex technique are as follows: acceptable material, heating, forging, hot rolling, cooling (heat treatment) and product inspection It tests.

The forging and stamping, rolling are the mature prior art, the present invention and traditional mode of production big cross section circle technique for bar material tool There is the difference of essence, traditional mode of production big cross section pole material is using forging or rolling mill practice.The circle Surface of Rod Bar of forging technology production Out-of-flatness, there are forging and stamping trace, dimensional accuracy not can be effectively controlled, and improve surface quality by peeling, and metal loss is high, production effect Rate is low, at high cost and not environmentally;Although the pole material surface quality of rolling mill practice production is good, mostly by blank specification and roll-force The limitation of center portion penetrating power difference can only produce the high performance steel of small dimension, and the shrinking hole remnant of slab center portion, loose etc. lack Falling into cannot be effectively improved, and steel core is of poor quality.

Summary of the invention

The technical issues of solution: present invention mainly solves be the prior art production forging material surface irregularity, there are forging and stamping Trace;Small forging needs heating for multiple times to forge repeatedly, is easy to produce crackle and forging is caused to scrap, and product size precision cannot be effective Control improves surface quality by peeling, and metal loss is high, and production efficiency is low, at high cost and problem not environmentally;It solves simultaneously Limitation of the roll-force to big cross section steel center portion penetrating power difference, can only produce the high performance steel of small dimension;Rolling mill practice is raw Produce big cross section steel there are the shrinking hole remnant of raw material center portion, it is loose the defects of cannot be effectively improved, steel internal soundness promoted Limited technical problem.And steel product length can extend.

Overcoming conventional forging process needs heating for multiple times forging and forming, poor dimensional precision, surface not only circle, production efficiency The disadvantages of low, at high cost, and overcome existing steel rolling equipment and cannot produce φ 800mm and with cross-section various high property below The deficiency of energy steel.

Technical solution:

A kind of method of the forging rolling duplex technique production long material of steel alloy big cross section, step are as follows:

Step 1: the heating in walking beam furnace (1) as raw material of steel alloy slab and steel ingot, raw material has been heated to Full austenite region, alloying element are dissolved completely, and raw material starting forging temperature is above 80-250 DEG C of Ac3 temperature spot, original etc. Axialite, column crystal and crystal boundary melt, and chemical component is diffused, and are changed into austenite grain;It is gone by high-pressure water descaler (2) Except scale on surface, forging and stamping unit (3) is recycled to be forged, obtains length increases, section reduces circle or other are disconnected The forging in face;In forging process, original austenite grain is broken, forms crystal grain, and the continuous forming core of crystal grain grows up generation dynamic again Crystallization, obtains uniform texture structure;

Step 2: using forging waste heat, by forging again through roughing blooming mill (4) reversing tandem rolling at rule section, in Discontinuity surface or circular intermediate product, intermediate product go out roughing blooming mill (4) and cut (5) cutting head by cutting head, and heat is entered after cutting head Continuous mill train (6) is rolled into round or rule section final finished rolled piece;

Step 3: round or rule section final finished rolled piece is after docking shears (7) back-end crop, rolled piece passes through traversing motivation Structure (8) is transported to hot saw area roller-way, and after hot-metal sawing machine (9) carries out scale sawing, linear products are air-cooled by cold bed (10), obtains Even grain structure;

Step 4: be collected packing in collection device (11) after air-cooled, then in 400 DEG C or more handlings into burial pit (12) It is cooled down, is realized and be tempered using rolled piece waste heat, hydrogen and residual stress in release tapping;

Step 5: the examination and test of products, the large scale rod bar and basal area that finished steel specification is φ 50mm- φ 500mm are equal Long material, obtain the long material of steel alloy big cross section.

As a preferred technical solution of the present invention: the first step furnace temp is 1100-1350 DEG C, φ 500mm section and with homalographic raw material walking beam furnace computer heating control high-temperature region furnace gas temperature below at 1100-1280 DEG C Between;φ 500mm- φ 800mm section and with it is more than homalographic steel billet control walking beam furnace high-temperature region furnace gas temperature exist Between 1250-1350 DEG C;The saturating starting forging temperature of heating steel billet is 1150-1300 DEG C.

As a preferred technical solution of the present invention: rolled piece surface temperature gradually drops in the second step rough rolling process Low, start rolling temperature is at 1050-1150 DEG C, and during the rolling process, and rolled piece is acted on by longitudinal pressure and side-friction, and crystal grain is not It is disconnected to be crushed, elongate, but constantly forming core is grown up, and dynamic recrystallization is carried out;The finishing temperature control of hot tandem (6) is being tied again 30 DEG C of brilliant temperature or more, when rolling end of a period, rolled piece grain structure fine uniform, equi-axed crystal ratio reaches 80% or more.

As a preferred technical solution of the present invention: the finishing temperature is at 950 DEG C or more.

As a preferred technical solution of the present invention: the third step is air-cooled for according to different chemical composition and to material Performance requirement carries out the control of temperature and cooling velocity, and rolled piece cooled down with the speed of 0.10-0.5 DEG C/s, realize slow cooling or Normalizing heat treatment;For the alloy steel products that can be required that have specific characteristics, rapid cooling is carried out by the speed of 0.50-1.0 DEG C/s, is obtained tiny , the precipitated phase that the spread is high, thin ferrite and pearlite tissue;Rolled piece is in Ar3-Ar1 temperature range with 1.0-2.0 DEG C/s Speed cooled down, further fining ferrite grains change Morphology of pearlite and piece interlamellar spacing, improve the toughness of rolled piece.

As a preferred technical solution of the present invention: the 4th step burial pit slow cooling temperature is between 400-600 DEG C.

As a preferred technical solution of the present invention: the steel alloy slab and steel ingot, face size range 40000mm2-502400mm2

The utility model has the advantages that

1, it is rolled using forging waste heat, saves the energy.The application device layout is compact, eliminates heater for rolling steel land occupation face Product, reduces workshop and factory site area, has saved cost of investment;Cancel the heating furnace heating process of traditional steel rolling production-line, pole It is big to reduce equipment investment and save energy consumption, it is a kind of energy-efficient production method.

2, raw material primary heating forging rolling production overlength bar and the long material of cross-section are realized.Using the big material of forging press The plastic processing of plastic processing deformation ability and good center portion seepage deformation ability and high-precision Continuous mill train precise forming becomes Shape ability combines connection production, ensure that the homogenieity of long material amount.

3, the application is strong to adaptability to raw material, flexible process design, can be flexibly using less than φ 1000mm and basal area phase Equal-specification is rectangular, polygonal equal section other shapes forging stock and continuous casting billet, caststeel ingot etc. are used as raw material, produces φ 50mm- φ The equal various shape specification product group of round steel and basal area between 800mm specification away from surface, excellent each of internal soundness The long material of class section configuration.

4, production method is suitable for mild steel, medium carbon steel, high-carbon steel, high-alloy steel and each metalloid material.

5, product size precision and surface smoothness are improved, hot rolling material surface quality level, interiors of products tissue are reached Consistency is high, and performance difference is small.

6, the start rolling temperature of stability contorting various specifications steel, finishing temperature realize low-temperature deformation, refine crystal grain, make big While proof strength, modeling, toughness significantly improve specification steel.

7, equipment input cost is low, effectively expands range of product size, can produce longest 25 by forging rolling duplex technique The φ 50mm- φ 500mm set of specifications of rice is away from the long material of big cross section.

8, any surface finish, straightness improve, every meter of round steel curvature high no more than 2mm, product size tolerance grade, round steel Dimensional accuracy reaches the 2nd group of level of GB/T702.

9, big cross section steel grain size can reach 7-9 grades of ranges, obtain the desired tissue of fine uniform, banded structure and steel Material hardness is effectively controlled and improves, band-like to can be effectively controlled to 2.0 grades or less.

10, the operation of this production method is convenient, adjusts convenient for production, and high production efficiency, and investment is low, is a kind of new Type, the new process of energy-saving and environmental protection and new method have great market popularization value and building capability.

11, the forging rolling duplex technique that the present invention innovatively uses is utilized the big Plastic working " of forging press and becomes Shape ability and good center portion seepage deformation ability, make to cast in (ingot) base the mass defects such as center porosity, shrinkage cavity, forging Soldering is realized in the process, improves steel consistency;The plastic processing deformation ability of high-precision rolling mill precise forming is utilized again, gram The advantages of having taken the deficiency of former two kinds of production technologies, while former two kinds of technique being utilized again produces inside solid degree height, surface The long material of bright and clean, dimensional accuracy is high steel alloy big cross section pole material or cross-section other shapes section.

12, present invention eliminates forging to carry out slow cooling offline, peeling reconditioning treatment process is saved, by forging and rolling two The duplex of kind of technique effectively combines online, is a kind of innovation, advanced process and production method.It realizes process and produces The optimization of quality, avoiding forging surface, there are the mass defects of uneven malleation.

13, the present invention is by forging rolling duplex technique, and by rolling, any surface finish, straightness mentions the forging and stamping trace on forging surface It is high that (round steel curvature is increased to every meter no more than 2mm), high (the round steel size of product size tolerance grade no more than 5mm by every meter It is horizontal that precision reaches the 2nd group of GB/T702), product quality and class be improved significantly, eliminate traditional press forging surface and carry out The process of peeling and metal cutting forging and stamping trace, metal loss are reduced, are increased operation rate, and reduce production cost.

14, forging rolling duplex technique of the present invention makes full use of processing heat caused by the large deformation of (ingot) base of steel in forging process Can and forging waste heat, appropriate online concurrent heating forging, makes forging be directly entered milling train and is rolled when necessary, complete hot rolling accurately at Type eliminates the heating furnace heating process of traditional steel rolling production-line, greatly reduces equipment investment and saves energy consumption, and is a kind of Energy-efficient production technology and production method.

15, have great improvement of the present invention to steel material tissue takes full advantage of forging and stamping and is crushed to crystal grain, Grain structure texture is grown up by further elongation, disconnection, forming core in the operation of rolling, realizes Dynamic Recrystallization, finally Big cross section steel are made to obtain the fine grained texture of fine uniform, big cross section steel grain size can reach 7-9 grades of ranges, this is traditional big Rolling bar institute is irrealizable.

16, the present invention is that forging equipment and rolling equipment are combined and worked continuously online, realizes that the thermal deformation of steel material adds Work, device layout is compact, eliminates heater for rolling steel and occupied area, reduces workshop and factory site area, saved investment at This.

17, forging rolling duplex technique of the present invention is one-heating forming, reduces the raw material heating process before forging is rolled, realizes Long material forging rolling continuous production, with short production cycle, low energy consumption, recovery rate of iron is high.

18, the present invention directly controls rolling using forging waste heat, extends product length, can produce longest 25 by tandem rolling Rice, big specification pole material between Φ 300- Φ 500mm and with the long material of cross-section other shapes improve product geometry essence Degree;Center porosity and General Loosen are not more than 1.0 grades, and shrinking hole remnant is not more than 0.5 grade;The big of the section Φ 300- Φ 500mm is broken Face steel grain size can reach 7-9 grades of ranges, obtain the desired tissue of fine uniform.

19, the present invention can be flexibly using less than φ 1000mm and basal area phase equal-specification large round billet or with the other of equal section The blanks such as shape forging stock and continuous casting billet, caststeel ingot, the production various shape specification product equal less than φ 800mm and basal area. By the plastic deformation and the good center portion seepage deformation of forging of big compression ratio, keep steel inside solid degree high, mechanical property is excellent It is good, any surface finish, dimensional accuracy height.Meet the especially big pole of the above standard high quality of high-quality φ 300mm and the long material of big cross section The market demand.

20, forging rolling duplex technique disclosed in this invention is a kind of inventive process thinking and production method, be forging and stamping and The effective combination for rolling two kinds of Metal Forming methods is novel, energy-saving and environmental protection the new processes of one kind and new method.This life The operation of production method is convenient, adjusts convenient for production, and high production efficiency, invests low.With great market popularization value and Building capability.

Detailed description of the invention:

Fig. 1 is the method and process floor plan that the application forging rolling duplex technique produces the long material of steel alloy big cross section.

Description of symbols: 1, walking beam furnace, 2, high-pressure water descaler, 3, forging and stamping unit, 4, roughing blooming mill, 5, Cutting head is cut, 6, hot tandem, 7, docking shears, 8, horizontal mobile mechanism, 9, hot-metal sawing machine, 10, cold bed, 11, collection device, and 12, slow Cold hole.

Specific embodiment:

To be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below with reference to Specific embodiment, the present invention is further explained.

Embodiment 1:

As shown in Figure 1, a kind of method of the forging rolling duplex technique production long material of steel alloy big cross section, including walking beam furnace 1,5, hot tandem 6, docking shears 7, horizontal mobile mechanism are cut in high-pressure water descaler 2, forging and stamping unit 3, roughing blooming mill 4, cutting head 8, hot-metal sawing machine 9, cold bed 10, collection device 11, burial pit 12.

5, hot continuous rolling is cut in the walking beam furnace 1, high-pressure water descaler 2, forging and stamping unit 3, roughing blooming mill 4, cutting head Unit 6, docking shears 7, horizontal mobile mechanism 8, hot-metal sawing machine 9, cold bed 10, collection device 11 are sequentially connected, and burial pit 12 is built in life The side of producing line.

φ 1000mm steel alloy slab and steel ingot are sent into walking beam furnace 1, open walking beam furnace 1, high-temperature region It is warming up to 1250-1350 DEG C, by 2 surface de-scaling of high-pressure water descaler after the completion of heating, forging and stamping 3 starting forging temperature of unit is It 1200-1280 DEG C, is forged and pressed unit 3 and is forged into the forging of 550x550mm, when forging 1100-1230 DEG C of section of temperature, into opening Base roughing mill carries out reversible reciprocal rolling 7-9 passage, controls rolled piece gap waiting time per pass, complete in 900-1000 DEG C of section At last two passes, finishing temperature >=950 DEG C, rolling into section is φ 500mm hot rolled circular steel, and cuts 5 realizations by cutting head Rolled piece cutting head, hot tandem 6 is offline, and docking shears 7 do not use, and rolled piece, to horizontal mobile mechanism 8, uses replacement by roller transmission Guide groove transmission, rolled piece is passed runout table, the scale of 3-12m is cut into using hot saw 9 by horizontal mobile mechanism, using cold bed 10 It is cooling, it is collected using collection device 11, handling carries out slow cooling into slow cooling 12.

550x550x4000mm forging mill product specification φ 500mm round rolling technique table is shown in Table 1.

1 φ 500mm round rolling technique table of table

Embodiment 2:

As shown in Figure 1, a kind of method of the forging rolling duplex technique production long material of steel alloy big cross section, including walking beam furnace 1,5, hot tandem 6, docking shears 7, horizontal mobile mechanism are cut in high-pressure water descaler 2, forging and stamping unit 3, roughing blooming mill 4, cutting head 8, hot-metal sawing machine 9, cold bed 10, collection device 11, burial pit 12.

5, hot continuous rolling is cut in the walking beam furnace 1, high-pressure water descaler 2, forging and stamping unit 3, roughing blooming mill 4, cutting head Unit 6, docking shears 7, horizontal mobile mechanism 8, hot-metal sawing machine 9, cold bed 10, collection device 11 are sequentially connected, and burial pit 12 is built in life The side of producing line.

By φ 800mm material transfer into walking beam furnace 1, walking beam furnace 1 is opened, high-temperature region is warming up to 1250- 1350 DEG C, raw material is heated to complete austenitizing region, alloying element is dissolved completely, original equiax crystal, column crystal and crystalline substance Boundary melts, and chemical component is diffused, and is changed into austenite grain, passes through 2 surface de-scaling of high-pressure water descaler after the completion of heating, Forging and pressing 3 starting forging temperature of unit is 1200-1280 DEG C, and the forging for being forged into 550 × 550mm through forging and pressing unit 3 obtains length increasing The forging of circle or other sections that long, section reduces;In forging process, original austenite grain is broken, forms crystal grain, brilliant Grain constantly forming core, growing up occurs dynamic recrystallization, obtain uniform texture structure, when forging 1100-1230 DEG C of section of temperature, into Enter cogging roughing mill 4 and carries out reversible reciprocal rolling 7-9 passage, control rolled piece gap waiting time per pass, at 900-1000 DEG C Last two passes are completed in section, and finishing temperature >=950 DEG C, rolling into section is φ 500mm hot rolled circular steel, and is cut by cutting head 5 realize rolled piece cutting head, and hot tandem 6 is offline, and docking shears 7 do not use, and rolled piece, to horizontal mobile mechanism 8, is made by roller transmission With replacement guide groove transmission, rolled piece is passed runout table, the scale of 3-12m is cut into using hot saw 9 by horizontal mobile mechanism, using Cold bed 10 is cooling finally to be collected by collection device 11, and handling carries out slow cooling into slow cooling 12, is realized and is tempered using rolled piece waste heat, released The hydrogen in steel and residual stress, the examination and test of products are released, the long material of steel alloy big cross section is obtained.

Embodiment 3:

As shown in Figure 1, a kind of method of the forging rolling duplex technique production long material of steel alloy big cross section, including walking beam furnace 1,5, hot tandem 6, docking shears 7, horizontal mobile mechanism are cut in high-pressure water descaler 2, forging and stamping unit 3, roughing blooming mill 4, cutting head 8, hot-metal sawing machine 9, cold bed 10, collection device 11, burial pit 12.

5, hot continuous rolling is cut in the walking beam furnace 1, high-pressure water descaler 2, forging and stamping unit 3, roughing blooming mill 4, cutting head Unit 6, docking shears 7, horizontal mobile mechanism 8, hot-metal sawing machine 9, cold bed 10, collection device 11 are sequentially connected, and burial pit 12 is built in life The side of producing line.

By φ 800mm material transfer into walking beam furnace 1, walking beam furnace 1 is opened, high-temperature region is warming up to 1250- 1350 DEG C, by 2 surface de-scaling of high-pressure water descaler after the completion of heating, forging and stamping 3 starting forging temperature of unit is 1200-1280 DEG C, warp Forging and stamping unit 3 is forged into the forging of 550 × 550mm, when forging 1100-1230 DEG C of section of temperature, carries out into cogging roughing mill 13 passages of reversible reciprocal rolling, control rolled piece gap waiting time per pass complete last two passage in 1000-1050 DEG C of section Rolling, rolling into section is 255*273mm rectangular cross section, and cuts the cutting head of 5 realization rolled pieces by cutting head, and rolled piece enters hot tandem 6 are rolled, and the finished product pole of φ 250mm is rolled into, and at 950-980 DEG C, docking shears 7 do not use finishing temperature control, pass through To horizontal mobile mechanism 8, rolled piece is passed runout table, cuts into determining for 6-12m using hot saw 9 roller transmission by horizontal mobile mechanism 8 Ruler is finally collected by collection device 11 using cold bed 10 is cooling, and handling carries out slow cooling into slow cooling 12.

φ 550x550x4000mm forging mill product specification φ 250mm round rolling technique table is shown in Table 2.

2 φ 250mm round rolling technique table of table

Embodiment 4:

As shown in Figure 1, a kind of method of the forging rolling duplex technique production long material of steel alloy big cross section, including walking beam furnace 1,5, hot tandem 6, docking shears 7, horizontal mobile mechanism are cut in high-pressure water descaler 2, forging and stamping unit 3, roughing blooming mill 4, cutting head 8, hot-metal sawing machine 9, cold bed 10, collection device 11, burial pit 12.

5, hot continuous rolling is cut in the walking beam furnace 1, high-pressure water descaler 2, forging and stamping unit 3, roughing blooming mill 4, cutting head Unit 6, docking shears 7, horizontal mobile mechanism 8, hot-metal sawing machine 9, cold bed 10, collection device 11 are sequentially connected, and burial pit 12 is built in life The side of producing line.

By φ 300mm material transfer into walking beam furnace 1, walking beam furnace 1 is opened, high-temperature region is warming up to 1100- 1230 DEG C, by 2 surface de-scaling of high-pressure water descaler after the completion of heating, forging and stamping 3 starting forging temperature of unit is 1100-1200 DEG C, warp Forging and stamping unit 3 is forged into the forging of 200 × 200mm, when forging 1030-1100 DEG C of section of temperature, carries out into cogging roughing mill 5 passages of reversible reciprocal rolling, control rolled piece gap waiting time per pass complete last two passage in 1000-1050 DEG C of section Rolling, rolling into section is 80*115mm rectangular cross section, and cuts the cutting head of 5 realization rolled pieces by cutting head, and rolled piece enters hot tandem 6 It is rolled, is rolled into the finished product pole of φ 50mm, at 950-980 DEG C, docking shears 7 use finishing temperature control, carry out point again Ruler and back-end crop, by roller transmission to horizontal mobile mechanism 8, rolled piece is passed runout table, cut using hot saw 9 by horizontal mobile mechanism 8 It is broken into the scale of 6-12m, is finally collected by collection device 11 using cold bed 10 is cooling, handling carries out slow cooling into slow cooling 12.

φ 200x200x6000mm forging mill product specification φ 50mm round rolling technique table is shown in Table 3.

3 φ 50mm round rolling technique table of table

Basic principles and main features and and its advantage of the invention have been shown and described above.The technical staff of the industry It should be appreciated that the present invention is not limited to the above embodiments.It should be noted that above-mentioned embodiment does not limit in any form The present invention, all technical solutions obtained by the way of equivalent or equivalent transformation, all falls within protection scope of the present invention.

Claims (7)

1. a kind of method of the forging rolling duplex technique production long material of steel alloy big cross section, it is characterised in that step are as follows:
Step 1: the heating in walking beam furnace (1) as raw material of steel alloy slab and steel ingot, is heated to complete Austria for raw material Family name's body region, alloying element are dissolved completely, and raw material starting forging temperature is above 80-250 DEG C of Ac3 temperature spot, original equiax crystal, Column crystal and crystal boundary melt, and chemical component is diffused, and are changed into austenite grain;Table is removed by high-pressure water descaler (2) Face iron scale recycles forging and stamping unit (3) to be forged, and obtains length growth, the circle that section reduces or other sections Forging;In forging process, original austenite grain is broken, forms crystal grain, and the continuous forming core of crystal grain, generation dynamic of growing up are tied again Crystalline substance obtains uniform texture structure;
Step 2: using forging waste heat, by forging again through roughing blooming mill (4) reversing tandem rolling at rule section, middle interruption Face or circular intermediate product, intermediate product go out roughing blooming mill (4) and cut (5) cutting head by cutting head, and hot continuous rolling is entered after cutting head Unit (6) is rolled into round or rule section final finished rolled piece;
Step 3: round or rule section final finished rolled piece is after docking shears (7) back-end crop, rolled piece passes through horizontal mobile mechanism (8) it is transported to hot saw area roller-way, after hot-metal sawing machine (9) carries out scale sawing, linear products are air-cooled by cold bed (10), obtain uniformly Grain structure;
Step 4: being collected packing in collection device (11) after air-cooled, then carried out in 400 DEG C or more handlings into burial pit (12) It is cooling, it is realized and is tempered using rolled piece waste heat, hydrogen and residual stress in release tapping;
Step 5: the examination and test of products, the equal length of the large scale rod bar and basal area that finished steel specification is Ф 50mm- Ф 500mm Material obtains the long material of steel alloy big cross section.
2. the method for producing the long material of steel alloy big cross section according to forging rolling duplex technique described in right 1, it is characterised in that: described first Walking furnace temp is 1100-1350 DEG C, Ф 500mm section and with homalographic raw material stepped heating stove heating control below Preparing high-temp area furnace gas temperature is between 1100-1280 DEG C;Ф 500mm- Ф 800mm section and with it is more than homalographic steel billet control Walking beam furnace high-temperature region furnace gas temperature is between 1250-1350 DEG C;Heating steel billet is saturating, starting forging temperature 1150-1300 ℃。
3. the method for producing the long material of steel alloy big cross section according to forging rolling duplex technique described in right 1, it is characterised in that: described second Rolled piece surface temperature gradually reduces in step rough rolling process, and start rolling temperature is at 1050-1150 DEG C, and during the rolling process, rolled piece by Longitudinal pressure and side-friction effect, crystal grain are constantly crushed, elongate, and constantly forming core is grown up, and dynamic recrystallization is carried out;Heat The finishing temperature control of Continuous mill train (6) is at 30 DEG C of recrystallization temperature or more, and when rolling end of a period, rolled piece grain structure is tiny Even, equi-axed crystal ratio reaches 80% or more.
4. the method for producing the long material of steel alloy big cross section according to forging rolling duplex technique described in right 3, it is characterised in that: the finish to gauge Temperature is at 950 DEG C or more.
5. the method for producing the long material of steel alloy big cross section according to forging rolling duplex technique described in right 1, it is characterised in that: the third The air-cooled control to carry out temperature and cooling velocity according to different chemical composition and to material performance requirement is walked, rolled piece is with 0.10- The speed of 0.5 DEG C/s is cooled down, and realizes slow cooling or normalizing heat treatment;For the alloy steel products that can be required that have specific characteristics, press The speed of 0.50-1.0 DEG C/s carries out rapid cooling, obtains precipitated phase tiny, that the spread is high, thin ferrite and pearlite group It knits;Rolled piece is cooled down in Ar3-Ar1 temperature range with the speed of 1.0-2.0 DEG C/s, further fining ferrite grains, is changed Morphology of pearlite and piece interlamellar spacing, improve the toughness of rolled piece.
6. the method for producing the long material of steel alloy big cross section according to forging rolling duplex technique described in right 1, it is characterised in that: the described 4th Burial pit slow cooling temperature is walked between 400-600 DEG C.
7. the method for producing the long material of steel alloy big cross section according to forging rolling duplex technique described in right 1, it is characterised in that: the alloy Steel slab and steel ingot, face size range 40000mm2—502400mm2
CN201810280376.0A 2018-03-29 2018-03-29 A kind of method of the forging rolling duplex technique production long material of steel alloy big cross section CN110153346A (en)

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