CN103567337A - Dual-phase steel hot processing method - Google Patents

Dual-phase steel hot processing method Download PDF

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Publication number
CN103567337A
CN103567337A CN201310513121.1A CN201310513121A CN103567337A CN 103567337 A CN103567337 A CN 103567337A CN 201310513121 A CN201310513121 A CN 201310513121A CN 103567337 A CN103567337 A CN 103567337A
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forging
phase steel
temperature
time
dual
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CN201310513121.1A
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CN103567337B (en
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朱亚南
刘铭洋
张学勇
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Wuhu Xinxing Ductile Iron Pipes Co Ltd
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Wuhu Xinxing Ductile Iron Pipes Co Ltd
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Abstract

The invention discloses a dual-phase steel hot processing method which comprises the following steps: a well prepared blank is sent to a furnace to be heated; then a charging and discharging machine is used for clamping and transferring a tube blank inside a chamber furnace to a rotary table, and then the rotary table is rotated for starting automatic loading; when the tube blank is clamped and transferred by a loading arm to the front of a loading operation machine, the loading operation machine clamps the tube blank, and then forging is started; after forging, forged steel is placed on a cooling bed for air cooling. Through the adoption of the technical scheme, a heating technology applicable to dual-phase steel original blanks with different specifications is provided; in addition, all technical parameters applicable to radial forging technology for dual-phase steel are also provided, and requirements for thermal pressure process production of the double-phase steel are met, such as the control on compression ratio, forging frequency, step size and angular speed; the dual-phase steel hot working method is suitable for forging long dual-phase steel and can provide a reference for high temperature nickel base alloy.

Description

A kind of hot-working method of dual phase steel
Technical field
The invention belongs to the technical field of metal material hot forming process equipment, relate to the Forging Technology of metal material, more particularly, the present invention relates to a kind of hot-working method of dual phase steel.
Background technology
The difficult forging degree of austenitic stainless steel will be higher than common stainless steel.Austenitic stainless steel is without allotropic transformation in heating process, and heating-up temperature is too high, and crystal grain is acutely grown up.Especially the α in two phase stainless steel also will increase mutually, and after heating-up temperature surpasses 1200 ℃, the quantity of α phase increases very fast.The austenitic stainless steel especially initial forging temperature of dual phase steel is generally all no more than 1200 ℃; Too low resistance of deformation is large, and separates out α phase 700~900 ℃ of interval slow cooling meetings, forges easily cracking, and final forging temperature is generally all got 900 ℃.Select a kind of applicable stainless steel especially the hot-working method of the long material of austenite-ferrite dual phase steel become a difficult problem of needing solution badly.
Through the literature search of prior art is found, Li Yanping etc. once delivered " process analysis procedure analysis of axletree radial forging " literary composition at < < forging and stamping equipment with manufacturing technology > > magazine (2007/01).This article utilizes radial forging to forge high-quality No. 45 axletrees, and radial forging has that deformation velocity is fast, precision is high and the feature such as temperature drop is slow.But 50 steel axletree initial forging temperatures are 950 ℃~1150 ℃, and final forging temperature is not less than 800 ℃, and length only has 2.1m.This technique is not suitable for the forging of the long material of dual phase steel.
Summary of the invention
The invention provides a kind of hot-working method of dual phase steel, its objective is a difficult problem for the thermal pressure processing that solves the long material of dual phase steel, realize dual phase steel normally forging on footpath forging machine.
To achieve these goals, the technical scheme that the present invention takes is:
The hot-working method of dual phase steel of the present invention, first send heating furnace to heat ready blank; Then with charging and discharging machine, the pipe in batch-type furnace is pressed from both sides to turntable, then rotating table starts automatic charging; When pipe is pressed from both sides by material loading arm to before material loading manipulator time, material loading manipulator is clamped blank, then starts to forge; After forging finishes, forging material is let cool to a upper air cooling.
When original blank maximum gauge or minimum thickness are less than Φ 300, be directly warmed up to forging temperature; Otherwise need be incubated at 750~800 ℃ the every increase of diameter or thickness 50mm, holding time 30min; Maximum heating temperature is 1120 ℃~1200 ℃; Temperature retention time is: the every increase of diameter or thickness 60mm, holding time 50~60min;
While forging, according to following parameter:
Compression ratio is controlled at every time between 1.05~1.2, has just started compression ratio little, and pilot process progressively increases compression ratio, and while approaching finishing passage, compression ratio will reduce; Step change 25~30mm/ time, whole process is substantially constant; Angular velocity of rotation be 20~30 degree/time; Forging process remains unchanged substantially, finishing angle is minimum be traditionally arranged to be 5~10 degree/time; Tup often impacts a time and is controlled at 300~1000ms, and initial frequency is low, and finishing frequency is the highest, and change of frequency is linear rule with rolling pass increase and changes.
In forging process, when temperature drops to the material fragility temperature range of 940~950 ℃, suitably reduce drafts, reduce and forge the frequency or carry out short stay 30~60 seconds, to reduce the impact in brittleness temperature district; Final forging temperature is greater than 900 ℃.
When forging temperature is during lower than 900 ℃, reheat, carry out secondary forging.
The present invention adopts technique scheme, has proposed the heating process of the dual phase steel original blank of applicable different size; Also propose in addition every technical parameter of the Radial Forging Technology of applicable dual phase steel, meet the needs of the thermal pressure processing of dual phase steel, as the control to compression ratio, forging frequency, step-length and angular speed; The present invention is not only applicable to the forging of the long material of dual phase steel, and provides reference for high-temperature nickel-base alloy.
The specific embodiment
Description below by embodiment, is described in further detail the specific embodiment of the present invention, to help those skilled in the art to have more complete, accurate and deep understanding to inventive concept of the present invention, technical scheme.
The present invention is a kind of hot-working method of dual phase steel, first send heating furnace to heat ready blank.
In order to solve the problem of prior art existence and overcome its defect, realizing the goal of the invention of a difficult problem for the thermal pressure processing that solves the long material of dual phase steel, the technical scheme that the present invention takes is:
The hot-working method of dual phase steel of the present invention, after heating, presss from both sides the pipe in batch-type furnace to turntable with charging and discharging machine, and then rotating table starts automatic charging; When pipe is pressed from both sides by material loading arm to before material loading manipulator time, material loading manipulator is clamped blank, then starts to forge; After forging finishes, forging material is let cool to a upper air cooling.
When original blank maximum gauge or minimum thickness are less than Φ 300, be directly warmed up to forging temperature; Otherwise need be incubated at 750~800 ℃ the every increase of diameter or thickness 50mm, holding time 30min; Maximum heating temperature is 1120 ℃~1200 ℃; Temperature retention time is: the every increase of diameter or thickness 60mm, holding time 50~60min;
While forging, according to following parameter:
Compression ratio is controlled at every time between 1.05~1.2, has just started compression ratio little, and pilot process progressively increases compression ratio, and while approaching finishing passage, compression ratio will reduce; Step change 25~30mm/ time, whole process is substantially constant; Angular velocity of rotation be 20~30 degree/time; Forging process remains unchanged substantially, finishing angle is minimum be traditionally arranged to be 5~10 degree/time; Tup often impacts a time and is controlled at 300~1000ms, and initial frequency is low, and finishing frequency is the highest, and change of frequency is linear rule with rolling pass increase and changes;
In forging process, when temperature drops to the material fragility temperature range of 940~950 ℃, suitably reduce drafts, reduce and forge the frequency or carry out short stay 30~60 seconds, to reduce the impact in brittleness temperature district; Final forging temperature is greater than 900 ℃.
When forging temperature is during lower than 900 ℃, reheat, carry out secondary forging.
Compared with prior art, the present invention has proposed the heating process of the dual phase steel original blank of applicable different size in above-mentioned steps; Propose to be in addition applicable to the Radial Forging Technology of dual phase steel such as the control of compression ratio, forging frequency, step-length and angular speed.The present invention is not only applicable to the forging of the long material of dual phase steel, and can be high-temperature nickel-base alloy reference is provided.
Embodiment mono-: the hot-working method of the long material of 00Cr18Ni5Mo3Si2 that diameter is 125.
Referring to table 1.The process of the present embodiment and technical parameter are:
1, select four jiaos of ingots that major part 290, microcephaly 250mm, length are 1.35m.First stove preheating 0.5 hour, furnace temperature was not higher than 800 ℃, and maximum heating temperature is 1150 ℃, insulation 5h.
2, because steel ingot two is inhomogeneous, directly go up footpath forging machine and forge easily forging machine is caused damage, therefore, the present embodiment adopts the first fast method of footpath forging molding after cogging of forging to forge.Fast forging cogging is of a size of the anistree ingot of 250mm, and after cogging, charge length is 1650mm left and right.Fast forging send double chamber furance to heat half an hour after ending base again, then send footpath to forge machine moulding.
Footpath is forged machine and is forged according to parameter shown in table 1.
3, in forging process when temperature is fallen into 950 ℃, now entered the 5th and 6 passages, the drafts of this two passage changes 15mm into, will forge the frequency simultaneously and change 650ms into once.Final forging temperature is greater than 900 ℃.When forging temperature reheats lower than 900 ℃, carry out secondary forging.
After forging finishes, forging material is let cool to a upper air cooling.
Table 1: the long material of 00Cr18Ni5Mo3Si2 of diameter 125 radially forge technological parameter
Embodiment bis-: the hot-working method of the long material of 00Cr18Ni5Mo3Si2 that diameter is 85.
Referring to table 2.The process of the present embodiment and technical parameter are:
1, select four jiaos of ingots that major part 250, microcephaly 200mm, length are 1.26m.First stove preheating 0.5 hour, furnace temperature was not higher than 800 ℃, and maximum heating temperature is 1150 ℃, insulation 3h.
2, because steel ingot two is inhomogeneous, directly go up footpath forging machine and forge easily forging machine is caused damage, therefore, the present embodiment adopts the first fast method of footpath forging molding after cogging of forging to forge.Fast forging cogging is of a size of the anistree ingot of 200mm, and after cogging, charge length is 1600mm left and right.Fast forging send double chamber furance to heat half an hour after ending base again, then send footpath to forge machine moulding.Footpath is forged machine and is forged according to parameter shown in table 2.
3, in forging process when temperature is fallen into 950 ℃, now entered the 7th and 8 passages, the drafts of this two passage changes 15mm into, will forge the frequency simultaneously and change 650ms into once.Final forging temperature is greater than 900 ℃.When forging temperature reheats lower than 900 ℃, carry out secondary forging.
4, forging lets cool a upper air cooling by forging material after finishing.
Table 2: the long material of 00Cr18Ni5Mo3Si2 that diameter is 85 radially forge technological parameter
pass CS MS MM D1 D0 MFD Tcycle Alnc
0 round S LLC 230 240 0 999 0
1 round S S 215 280 30 700 22.5
2 round S S 190 250 30 600 22.5
3 round S S 170 225 30 600 22.5
4 round S S 150 210 30 600 22.5
5 round S S 135 185 30 600 22.5
6 round S S 120 170 30 600 22.5
7 round S S 105 155 30 650 22.5
8 round S S 95 140 30 650 22.5
9 round S S 85 130 30 600 22.5
10 round S S 85 105 18 300 9
Embodiment tri-: the hot-working method of the long material of 00Cr18Ni5Mo3Si2 that diameter is 105:
Referring to table 3.The process of the present embodiment and technical parameter are:
1, select four jiaos of ingots that major part 290, microcephaly 250mm, length are 1.35m.First stove preheating 0.5 hour, furnace temperature was not higher than 800 ℃, and maximum heating temperature is 1150 ℃, insulation 5h.
2, because steel ingot two is inhomogeneous, directly go up footpath forging machine and forge easily forging machine is caused damage, therefore, the present embodiment adopts the first fast method of footpath forging molding after cogging of forging to forge.Fast forging cogging is of a size of the anistree ingot of 250mm, and after cogging, charge length is 1650mm left and right.Fast forging send double chamber furance to heat half an hour after ending base again, then send footpath to forge machine moulding.Footpath is forged machine and is forged according to parameter shown in table 3.
3, in forging process, when temperature is brought down below 950 ℃, now entered the 5th and 6 passages, the drafts of this two passage changes 15mm into, will forge the frequency simultaneously and change 650ms into once.After several passages all change light reduction into.The frequency is accelerated, to guarantee to forge temperature.Final forging temperature is greater than 900 ℃.When forging temperature reheats lower than 900 ℃, carry out secondary forging.
5, forging lets cool a upper air cooling by forging material after finishing.
Table 3: the long material of 00Cr18Ni5Mo3Si2 that diameter is 105 radially forge technological parameter
pass CS MS MM D1 D0 MFD Tcycle Alnc
0 round S LLC 316 300 0 999 0
1 round S S 270 360 30 700 22.5
2 round S S 250 320 30 650 22.5
3 round S S 225 290 30 650 22.5
4 round S S 200 270 30 650 22.5
5 round S S 185 240 30 650 22.5
6 round S S 175 220 30 650 22.5
7 round S S 162 210 30 600 22.5
8 round S S 150 200 30 600 22.5
9 round S S 135 185 30 600 22.5
10 round S S 125 170 30 600 22.5
11 round S S 115 160 30 600 22.5
12 round S S 105 150 30 600 22.5
13 round S S 105 125 20 300 9
Above the present invention is exemplarily described; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or without improving, design of the present invention and technical scheme are directly applied to other occasion, all within protection scope of the present invention.

Claims (4)

1. a hot-working method for dual phase steel, first send heating furnace to heat ready blank; It is characterized in that:
Then with charging and discharging machine, the pipe in batch-type furnace is pressed from both sides to turntable, then rotating table starts automatic charging;
When pipe is pressed from both sides by material loading arm to before material loading manipulator time, material loading manipulator is clamped blank, then starts to forge;
After forging finishes, forging material is let cool to a upper air cooling.
2. according to the hot-working method of dual phase steel claimed in claim 1, it is characterized in that:
When original blank maximum gauge or minimum thickness are less than Φ 300, be directly warmed up to forging temperature; Otherwise need be incubated at 750~800 ℃ the every increase of diameter or thickness 50mm, holding time 30min; Maximum heating temperature is 1120 ℃~1200 ℃; Temperature retention time is: the every increase of diameter or thickness 60mm, holding time 50~60min;
While forging, according to following parameter:
Compression ratio is controlled at every time between 1.05~1.2, has just started compression ratio little, and pilot process progressively increases compression ratio, and while approaching finishing passage, compression ratio will reduce;
Step change 25~30mm/ time;
Angular velocity of rotation be 20~30 degree/time; Finishing angle minimum set be 5~10 degree/time;
Tup often impacts a time and is controlled at 300~1000ms, and initial frequency is low, and finishing frequency is the highest, and change of frequency is linear rule with rolling pass increase and changes.
3. according to the hot-working method of dual phase steel claimed in claim 1, it is characterized in that: in forging process, when temperature drops to the material fragility temperature range of 940~950 ℃, suitably reduce drafts, reduce and forge the frequency or carry out short stay 30~60 seconds, to reduce the impact in brittleness temperature district; Final forging temperature is greater than 900 ℃.
4. according to the hot-working method of dual phase steel claimed in claim 1, it is characterized in that: when forging temperature is during lower than 900 ℃, reheat, carry out secondary forging.
CN201310513121.1A 2013-10-26 2013-10-26 Dual-phase steel hot processing method Active CN103567337B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104294021A (en) * 2014-10-24 2015-01-21 无锡市派克重型铸锻有限公司 Duplex stainless steel forging and molding process
CN104493027A (en) * 2014-10-24 2015-04-08 无锡市派克重型铸锻有限公司 Technology for forging duplex stainless steel
CN106363117A (en) * 2016-11-17 2017-02-01 攀钢集团攀枝花钢铁研究院有限公司 Forging method for large-specification GH1016 round alloy rods
CN107502722A (en) * 2017-10-12 2017-12-22 徐州东鹏工具制造有限公司 A kind of Heat-Treatment of Steel technique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257522A (en) * 1991-07-09 1993-11-02 Nippon Steel Corporation Process of hot forging at ultrahigh temperature
JPH1099930A (en) * 1996-09-27 1998-04-21 Daido Steel Co Ltd High speed hot forging method for high speed steel
CN101456059A (en) * 2007-12-12 2009-06-17 中冶京诚工程技术有限公司 Special free-forging hydraulic unit and use method thereof
CN101862805A (en) * 2010-07-06 2010-10-20 杨少华 Inner heating furnace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5257522A (en) * 1991-07-09 1993-11-02 Nippon Steel Corporation Process of hot forging at ultrahigh temperature
JPH1099930A (en) * 1996-09-27 1998-04-21 Daido Steel Co Ltd High speed hot forging method for high speed steel
CN101456059A (en) * 2007-12-12 2009-06-17 中冶京诚工程技术有限公司 Special free-forging hydraulic unit and use method thereof
CN101862805A (en) * 2010-07-06 2010-10-20 杨少华 Inner heating furnace

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104294021A (en) * 2014-10-24 2015-01-21 无锡市派克重型铸锻有限公司 Duplex stainless steel forging and molding process
CN104493027A (en) * 2014-10-24 2015-04-08 无锡市派克重型铸锻有限公司 Technology for forging duplex stainless steel
CN104294021B (en) * 2014-10-24 2016-05-25 无锡市派克重型铸锻有限公司 A kind of two phase stainless steel forging molding process
CN106363117A (en) * 2016-11-17 2017-02-01 攀钢集团攀枝花钢铁研究院有限公司 Forging method for large-specification GH1016 round alloy rods
CN106363117B (en) * 2016-11-17 2019-03-15 攀钢集团攀枝花钢铁研究院有限公司 The forging method of big specification GH1016 alloy pole
CN107502722A (en) * 2017-10-12 2017-12-22 徐州东鹏工具制造有限公司 A kind of Heat-Treatment of Steel technique

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