CN103572022A - Heat-treatment method for H13 section steel - Google Patents

Heat-treatment method for H13 section steel Download PDF

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CN103572022A
CN103572022A CN201310548794.0A CN201310548794A CN103572022A CN 103572022 A CN103572022 A CN 103572022A CN 201310548794 A CN201310548794 A CN 201310548794A CN 103572022 A CN103572022 A CN 103572022A
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forging
temperature
heat treating
shaped steel
treating method
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CN103572022B (en
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黎作先
柯其棠
何燕平
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Daye Special Steel Co Ltd
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Daye Special Steel Co Ltd
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Abstract

The invention discloses a heat-treatment method for H13 section steel. The method comprises the following operating steps of 1, cooling a steel forged piece forged by a radial forging machine to be lower than 300 DEG C at cooling speed of 10 to 200 DEG C per minute, wherein the forging stopping temperature of the radial forging machine is 900 to 950 DEG C; 2, preserving the heat of the steel forged piece treated by the step 1 under the condition of 830 to 880 DEG C, cooling the steel forged piece to 700 to 760 DEG C, and performing secondary isothermal spheroidization and cooling, wherein the secondary isothermal spheroidization comprises low-temperature spheroidization and heating for high-temperature spheroidization. According to the heat-treatment method for the H13 section steel, the once inspection percent of pass of the steel forged piece is improved; a product is inspected to be above level A4 in a die material standard NADCA207# of North American die casting association; a production cycle is shortened by more than 20 hours; the labor cost and the gas consumption cost are significantly lowered.

Description

The heat treating method of H13 shaped steel
Technical field
The present invention relates to a kind of heat treating method, in particular to a kind of heat treating method of H13 shaped steel.
Background technology
H13 steel is C-Cr-Mo-Si-V shaped steel, and application is in the world extremely general.The following technique of the general employing of forging postheat treatment process for H13 series: slow cooling or isothermal spheroidizing slow cooling after for some time (being general technology) under 700-750 ℃ of condition after forging material is incubated under 830～880 ℃ of conditions; Before above-mentioned technique, add sometimes and quench or normalizing process (being reinforcing process), but these techniques have the following disadvantages conventionally:
(1) general steel are forged rear inhomogeneous cooling, martensite, the Various Tissues such as residual austenite are also deposited, tissue morphology is inhomogeneous, adopt after above-mentioned general technology annealing, have block and strip eutectic carbides, crystal boundary has net secondary Carbide Precipitation, so carry out general technology, be difficult to obtain desirable even fine tissue, thus the life-span of the mould that impact is made.
(2) while adopting reinforcing process to add general technology processing, because quenching or the normalizing temperature of H13 shaped steel are higher, steel need be hung oneself from table, worker laboring environment is poor, and intensity is large, and has certain quenching or normalizing cost.
(3) when annealing furnace is large or feed when more, particularly in stove, all to there is the larger temperature difference during temperature-fall period, formulate certain technological temperature isothermal spheroidizing, can not be suitable for the steel of differing temps in stove, nodularization effect is poor.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of heat treating method of H13 shaped steel is provided, the tissue class of the forging material obtaining by the method be you can well imagine high, and the production cycle shortens, and labour cost reduces.
To achieve these goals, the present invention has adopted following technical scheme:
A heat treating method for H13 shaped steel, comprises following operation steps:
Step 1, by adopting forging steel after forging machine in footpath forges, by cross-sectional sizes, the speed of cooling with 10-200 ℃/min is cooled to below 300 ℃, and it is 900-950 ℃ that the stopping of wherein said footpath forging machine forged temperature;
Step 2, after the forging steel of processing through step 1 are incubated under 830～880 ℃ of conditions, be cooled to again 700-760 ℃ cooling after carrying out secondary isothermal spheroidizing, described secondary isothermal spheroidizing refers to that then first low temperature nodularization heats up and carries out high-temperature nodularization.
In described step 1, forging steel are quickly cooled to 300 ℃ to be below Ms point (starting temperature of martensitic transformation) below, can make final structural transformation complete, organize to be more singlely more conducive to nodularization and to become fine tissue.
In above-mentioned heat treating method, before the forging of the described forging steel in described step 1, temperature is preferably controlled within the scope of 1100-1180 ℃.
In above-mentioned heat treating method, as a kind of preferred implementation, in described step 1, described footpath is forged machine draught of each passage in forging process and is controlled at 10-50mm, controlling angle is at 10-30 °, and the amount of feed is controlled at 20-60mm, hits at every turn and is controlled at 300-1000ms cycling time.By diameter, forge the setting of the above-mentioned parameter of machine, can control preferably the deflection of each passage, make the distortion heat (can make steel material temperature increase) that steel material produces in deformation process reach balance with steel material natural temperature drop in forging process, thereby control and stop forging temperature 900-950 ℃ of scope, be isothermal forging, allow all positions of a steel all in this temperature range.Described stop forging temperature exemplary can be 910 ℃, 915 ℃, 920 ℃, 925 ℃.Control stops forging temperature and is conducive to carbide fragmentation, can prevent grain growth again.
In above-mentioned heat treating method, as a kind of preferred implementation, in described step 1, described forging steel are cooled to 300 ℃ of following modes for online water spray or immersion mode, can guarantee so comparatively fast forging material to be cooled to 300 ℃ following and also cooling evenly, exemplary can be cooled to 250 ℃, 268 ℃, 276 ℃, 285 ℃, 290 ℃, 290-300 ℃, thereby realizes the effect that is similar to quenching.
Described online water spray is to adopt online waterworks to realize, and this online waterworks can be realized the Quick uniform of the forging steel after forging cooling.After this online waterworks is arranged at footpath forging machine, the forging steel after forging machine in footpath forges can directly pass through from the center of this online waterworks, thereby realize cooling fast.Exemplarily, this online waterworks comprises: the cylindric support of horizontal positioned, comprises at two annulus at two ends and be evenly erected at the pipeline that a plurality of and high-pressure water pipe between two annulus is communicated with; And being arranged at a plurality of nozzles on described a plurality of pipeline, the water spraying direction of described a plurality of nozzles is all towards the central axis A A of described cylindric support.Need cooling forging steel to pass through from the center of cylindric support, water just waters on forging steel, thereby makes forging reach fast cooling object.
Described online immersion is to adopt online immersion device to realize, and this device that soaks online also can be realized the Quick uniform of the forging steel after forging cooling.After this online immersion device is arranged at footpath forging machine, the forging steel after forging machine in footpath forges can directly be placed in online immersion device, thereby realize cooling fast.Exemplarily, this device that soaks is online the tank that is arranged at Duan Ji rear, footpath, and the forging after forging can directly be put into this tank, thereby makes forging reach fast cooling object.
In above-mentioned heat treating method, in described step 2, carrying out secondary isothermal spheroidizing is the steel that have the temperature difference in annealing furnace in order to meet, steel are when furnace annealing, if annealing furnace furnace temperature homogeneity is bad, single isothermal spheroidizing temperature cannot adapt to the steel of each position in stove, cannot obtain evenly tiny tissue, not reach Spheroidizing Annealing effect, so adopted secondary isothermal spheroidizing.The temperature of described low temperature nodularization is 700-730 ℃ preferably, exemplary can be 700-710 ℃, 720-730 ℃, 715-725 ℃, 728 ℃; The temperature of described high-temperature nodularization is 731-760 ℃ preferably, exemplary can be 735-745 ℃, 745-750 ℃, 755-758 ℃, 740 ℃.
In above-mentioned heat treating method, as a kind of preferred implementation, in described step 2, the time of described insulation is 2-20 hour, and workpiece is little, and a few optional short period of time of batch, workpiece is large, and one time batch is how optional long-time.
In above-mentioned heat treating method, as a kind of preferred implementation, in described step 2, described cooling adopts the cold mode of stove to lower the temperature, and more preferably cooling rate is for being not more than 30 ℃/h.
In above-mentioned heat treating method, as a kind of preferred implementation, in described step 2, the time of described low temperature nodularization is 2-10 hour, and workpiece is little, and a few optional short period of time of batch, workpiece is large, and one time batch is how optional long-time; The time of described high-temperature nodularization is 2-10 hour, and workpiece is little, and a few optional short period of time of batch, workpiece is large, and one time batch is how optional long-time.
In above-mentioned heat treating method, as a kind of preferred implementation, in described step 2, described cooling be that the cold mode of stove that is not more than 30 ℃/h by cooling rate is down to 600 ℃ of air coolings of coming out of the stove after following.
In above-mentioned heat treating method, as a kind of preferred implementation, described H13 shaped steel consists of the following composition by mass percentage: C:0.32-0.45%, Cr:4.5-5.5%Mo:1.1-1.75%, Si:0.8-1.2%, V:0.3-1.2%, Mn:0.15-0.5%, surplus is Fe and inevitable impurity.
Beneficial effect of the present invention: adopt method of the present invention H13 shaped steel to be heat-treated to the rate that is once up to the standards that has improved forging material tissue; Forging material organizes rank to be improved, and the examination and test of products reaches the above level of A4 in the moulding stock standard NADCA207# of North America die casting association; Production cycle shortens more than 20 hours; Labour cost and gas consumption cost have had obvious reduction.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of the H13 shaped steel after the inventive method thermal treatment.
Fig. 2 is the online waterworks structural representation using in the embodiment of the present invention.
Embodiment
Below by specific embodiment, the present invention is described in detail, but the present invention is not limited to this.
The online waterworks using in following examples has following structure, referring to Fig. 2.It comprises: the cylindric support 1 of horizontal positioned, comprises at two annulus 12 at two ends and be evenly erected at the pipeline 11 that a plurality of and high-pressure water pipe (not shown) between two annulus is communicated with; And be arranged at a plurality of nozzles 2 on described a plurality of pipeline 11, the water spraying direction of described a plurality of nozzle 2 is all towards the central axis A A of described cylindric support 1, when forging steel to be cooled pass through from the inside of cylindric support 1 along the direction of the central axis A A of cylindric support 1, described a plurality of nozzle 2 by high pressure water jets to forging steel surface to be cooled, thereby realize the cooling of forging steel.This waterworks can be realized the cooling rate of 10-200 ℃/min.
Embodiment 1
The H13 shaped steel forging material that the steel of 520 square gauge lattice are forged into 250 compasses lattice of take is example;
Heat treating method is as follows:
Step 1, adopting footpath to forge machine is that the steel of 1170-1180 ℃ forge to forging front temperature, the parameter setting that forge in machine program in footpath is as follows: the draught of each passage is 20-40mm, corner is 10-30 °, the amount of feed is 20-50mm, hit cycling time is 300-850ms at every turn, and stopping forging temperature is 900-950 ℃, then adopts above-mentioned online waterworks that the forging steel after forging are quickly cooled to 250 ℃;
Step 2, the forging steel of processing through step 1 are put into annealing furnace, be incubated 20h under 860 ℃ of conditions after, adopt again the cold mode of stove of 20 ℃/h of reduction of speed to be cooled to 720 ℃ and carry out low temperature isothermal spheroidizing 10h, be warming up to again 740 ℃ and carry out high temperature isothermal spheroidizing 10h, then by 20 ℃/h of reduction of speed, be down to 500 ℃ of air coolings of coming out of the stove.
Adopted aforesaid method thermal treatment 30 tons of above-mentioned forging materials, the once rate of being up to the standards of its tissue is 100%, improved 40%, be up to the standards the metallographic structure figure of product referring to Fig. 1, as can be seen from Figure 1 homogeneous microstructure is tiny, without block and strip eutectic carbides, the tissue of crystal boundary non-net secondary Carbide Precipitation; Forging material tissue is equivalent to A2 in NADCA207#, B2, and rank is improved, and the circular check of forging section product of H13 reaches the above level of A4 in the moulding stock standard NADCA207# of North America die casting association.
Embodiment 2
The H13 shaped steel forging material that the steel of 410 square gauge lattice are forged into 160 compasses lattice of take is example;
Heat treating method is as follows:
Step 1, adopting footpath to forge machine is that the steel of 1150-1160 ℃ forge to forging front temperature, the parameter setting that forge in machine program in footpath is as follows: the draught of each passage is 20-35mm, corner is 10-30 °, the amount of feed is 20-60mm, hit cycling time is 300-800ms at every turn, and stopping forging temperature is 900-910 ℃, then adopts above-mentioned online waterworks that the forging steel after forging are quickly cooled to 280 ℃;
Step 2, the forging steel of processing through step 1 are put into and after annealing furnace is incubated 18h under 830～835 ℃ of conditions, adopted the cold mode of stove of 20 ℃/h of reduction of speed to be cooled to 720 ℃ to carry out low temperature isothermal spheroidizing 10h again, be warming up to again 740 ℃ and carry out high temperature isothermal spheroidizing 8h, then by 20 ℃/h of reduction of speed, be down to 500 ℃ of air coolings of coming out of the stove.
Adopted aforesaid method thermal treatment 50 of above-mentioned forging materials, the once rate of being up to the standards of its tissue is 100%, has improved 30%, the homogeneous microstructure of the product that is up to the standards is tiny, without block and strip eutectic carbides, the tissue of crystal boundary non-net secondary Carbide Precipitation; Forging material organizes rank to be improved, and the circular check of forging section product of H13 reaches the above level of A4 in the moulding stock standard NADCA207# of North America die casting association.
Embodiment 3
The H13 shaped steel forging material that the steel of the flat specification of 200*450 are forged into the flat specification of 125*415 of take is example;
Heat treating method is as follows:
Step 1, adopting footpath to forge machine is that the steel of 1165 ℃ forge to forging front temperature, the parameter setting that forge in machine program in footpath is as follows: the draught of each passage is 20-35mm, corner is 10 °, the amount of feed is 20-50mm, hit cycling time is 300-800ms at every turn, and stopping forging temperature is 920-923 ℃, then adopts above-mentioned online waterworks that the forging steel after forging are quickly cooled to 280 ℃;
Step 2, the forging steel of processing through step 1 are put into and after annealing furnace is incubated 20h under 880 ℃ of conditions, adopted the cold mode of stove of 20 ℃/h of reduction of speed to be cooled to 720 ℃ to carry out low temperature isothermal spheroidizing 10h again, be warming up to again 740 ℃ and carry out high temperature isothermal spheroidizing 10h, then air cooling after slow cooling to 600 ℃.
Adopted aforesaid method thermal treatment 10 of above-mentioned forging materials, the once rate of being up to the standards of its tissue is 100%, has improved 20%, the homogeneous microstructure of the product that is up to the standards is tiny, without block and strip eutectic carbides, the tissue of crystal boundary non-net secondary Carbide Precipitation; Forging material organizes rank to be improved, and the check that H13 flat is forged section product reaches the above level of A4 in the moulding stock standard NADCA207# of North America die casting association.
The purposes that should be appreciated that these embodiment only limits the scope of the invention for the present invention being described but not being intended to.In addition; also should understand; after having read technology contents of the present invention, those skilled in the art can make various changes, modification and/or modification to the present invention, within these all equivalent form of values fall within the protection domain that the application's appended claims limits equally.

Claims (10)

1. a heat treating method for H13 shaped steel, is characterized in that, comprises the steps:
Step 1, by adopting forging steel after forging machine in footpath forges, by cross-sectional sizes, the speed of cooling with 10-200 ℃/min is cooled to below 300 ℃, and it is 900-950 ℃ that the stopping of wherein said footpath forging machine forged temperature;
Step 2, after the forging steel of processing through step 1 are incubated under 830～880 ℃ of conditions, be cooled to again 700-760 ℃ cooling after carrying out secondary isothermal spheroidizing, described secondary isothermal spheroidizing refers to that then first low temperature nodularization heats up and carries out high-temperature nodularization.
2. the heat treating method of H13 shaped steel according to claim 1, is characterized in that, in described step 1, before the forging of described forging steel, temperature is controlled at 1100-1180 ℃.
3. the heat treating method of H13 shaped steel according to claim 1 and 2, it is characterized in that, in described step 1, described footpath is forged machine draught of each passage in forging process and is controlled at 10-50mm, controlling angle is at 10-30 °, the amount of feed is controlled at 20-60mm, hits at every turn and is controlled at 300-1000ms cycling time.
4. the heat treating method of H13 shaped steel according to claim 1, is characterized in that, in described step 2, the temperature of described low temperature nodularization is 700-730 ℃; The temperature of described high-temperature nodularization is 731-760 ℃.
5. the heat treating method of H13 shaped steel according to claim 1, is characterized in that, in described step 1, described forging steel are cooled to 300 ℃ and by online water spray mode or immersion mode, realize below.
6. the heat treating method of H13 shaped steel according to claim 5, it is characterized in that, described online water spray mode realizes by online waterworks, after described online waterworks is arranged at described footpath forging machine, comprise: the cylindric support of horizontal positioned, comprises at two annulus at two ends and be evenly erected at the pipeline that a plurality of and high-pressure water pipe between two annulus is communicated with; And being arranged on a plurality of nozzles on described a plurality of pipeline, the water spraying direction of described a plurality of nozzles is all towards the central axis A A of described cylindric support.
7. the heat treating method of H13 shaped steel according to claim 1, is characterized in that, in described step 2, the time of described insulation is 2-20h; The time of described low temperature nodularization is 2-10h, and the time of described high-temperature nodularization is 2-10h.
8. the heat treating method of H13 shaped steel according to claim 1, is characterized in that, in described step 2, described cooling is that the cold mode of stove that adopts reduction of speed to be not more than 30 ℃/h is lowered the temperature.
9. the heat treating method of H13 shaped steel according to claim 1, it is characterized in that, described H13 shaped steel consists of the following composition by mass percentage: C:0.32-0.45%, Cr:4.5-5.5%, Mo:1.1-1.75%, Si:0.8-1.2%, V:0.3-1.2%, Mn:0.15-0.5%, surplus is Fe and inevitable impurity.
10. the heat treating method of H13 shaped steel according to claim 1, is characterized in that, in described step 2, described cooling be that the cold mode of stove that is not more than 30 ℃/h by cooling rate is down to 600 ℃ of air coolings of coming out of the stove after following.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113430337A (en) * 2021-05-28 2021-09-24 大冶特殊钢有限公司 Integral quenching and tempering heat treatment method for H13 round steel
CN115261569A (en) * 2022-08-22 2022-11-01 大冶特殊钢有限公司 Spheroidizing annealing method for 60Cr3 steel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101787492A (en) * 2010-03-17 2010-07-28 上海大学 Manufacturing method of high quality and large size mandril blank
CN103333997A (en) * 2013-07-02 2013-10-02 武汉钢铁(集团)公司 Annealing heat treatment method of H13 die steel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101787492A (en) * 2010-03-17 2010-07-28 上海大学 Manufacturing method of high quality and large size mandril blank
CN103333997A (en) * 2013-07-02 2013-10-02 武汉钢铁(集团)公司 Annealing heat treatment method of H13 die steel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113430337A (en) * 2021-05-28 2021-09-24 大冶特殊钢有限公司 Integral quenching and tempering heat treatment method for H13 round steel
CN115261569A (en) * 2022-08-22 2022-11-01 大冶特殊钢有限公司 Spheroidizing annealing method for 60Cr3 steel
CN115261569B (en) * 2022-08-22 2023-10-31 大冶特殊钢有限公司 60Cr3 steel ball annealing method

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