CN103572022B - Heat-treatment method for H13 section steel - Google Patents
Heat-treatment method for H13 section steel Download PDFInfo
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- CN103572022B CN103572022B CN201310548794.0A CN201310548794A CN103572022B CN 103572022 B CN103572022 B CN 103572022B CN 201310548794 A CN201310548794 A CN 201310548794A CN 103572022 B CN103572022 B CN 103572022B
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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
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.H13 series steel heat treatment after forging process generally adopts following technique: slow cooling or slow cooling after isothermal spheroidizing for some time (i.e. general technology) under 700-750 DEG C of condition after forging material is incubated under 830 ~ 880 DEG C of conditions; Before above-mentioned technique, add quenching or normalizing process (i.e. reinforcing process) sometimes, but these techniques have the following disadvantages usually:
(1) general steel cooling after forged is uneven, martensite, the Various Tissues such as residual austenite are also deposited, tissue morphology is uneven, after adopting above-mentioned general technology to anneal, there is block and strip eutectic carbides, crystal boundary has net secondary Carbide Precipitation, be difficult to obtain desirable even fine tissue so carry out general technology, thus the life-span of the mould of impact making.
(2) adopt reinforcing process when adding general technology process, due to the quenching of H13 shaped steel or normalizing temperature higher, steel need be hung oneself from table, worker laboring environment is poor, and intensity greatly, and has certain quenching or normalizing cost.
(3) when annealing furnace is comparatively large or when feeding more, particularly all will there is the larger temperature difference in stove 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, provide a kind of heat treating method of H13 shaped steel, the tissue class of the forging material obtained by the method be you can well imagine high, and the production cycle shortens, and labour cost reduces.
To achieve these goals, present invention employs following technical scheme:
A heat treating method for H13 shaped steel, comprises following operation steps:
Forging steel after adopting the forging of footpath forging machine are cooled to less than 300 DEG C by cross-sectional sizes with the speed of cooling of 10-200 DEG C/min by step one, and it is 900-950 DEG C that the stopping of wherein said footpath forging machine forges temperature;
Step 2, be cooled to again after the forging steel processed through step one are incubated under 830 ~ 880 DEG C of conditions 700-760 DEG C carry out secondary isothermal spheroidizing after cool, described secondary isothermal spheroidizing refers to that then first low temperature nodularization heats up and carries out high-temperature nodularization.
In described step one, forging steel are quickly cooled to less than 300 DEG C namely Ms point (starting temperature of martensitic transformation) below, final structural transformation can be made to complete, organize and be more singlely more conducive to nodularization and become fine tissue.
In above-mentioned heat treating method, before the forging of the described forging steel in described step one, temperature preferably controls within the scope of 1100-1180 DEG C.
In above-mentioned heat treating method, as a kind of preferred implementation, in described step one, the draught of described footpath forging machine each passage in forging process controls at 10-50mm, controlling angle is at 10-30 °, and the amount of feed controls at 20-60mm, and each strike controls at 300-1000ms cycling time.By the setting of the above-mentioned parameter of diameter forging machine, the deflection of each passage can be controlled preferably, the deformation heat (steel material temperature can be made to increase) that steel material is produced in deformation process and steel material natural temperature drop in forging process reach balance, thus control to stop forging temperature 900-950 DEG C of scope, i.e. isothermal forging, allows all positions of a steel all in this temperature range.Described stop forge temperature exemplary can be 910 DEG C, 915 DEG C, 920 DEG C, 925 DEG C.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 one, described forging steel are cooled to the mode of less than 300 DEG C for online water spray or immersion mode, can ensure so very fast forging material is cooled to less than 300 DEG C and also cooling even, exemplary can be cooled to 250 DEG C, 268 DEG C, 276 DEG C, 285 DEG C, 290 DEG C, 290-300 DEG C, thus realizes the effect being similar to quenching.
Described online water spray adopts online waterworks to realize, and this online waterworks can realize the Quick uniform cooling of the forging steel after to forging.After this online waterworks is arranged at footpath forging machine, the forging steel after the forging of footpath forging machine can directly pass through from the center of this online waterworks, thus realize cooling fast.Exemplarily, this online waterworks comprises: the cylindric support of horizontal positioned, comprises two annulus at two ends and is evenly erected at the pipeline that the multiple and high-pressure water pipe between two annulus is communicated with; And the multiple nozzles be arranged on described multiple pipeline, the water spraying direction of described multiple nozzle is all towards the central axis AA of described cylindric support.Need the forging steel of cooling to pass through from the center of cylindric support, water just waters on forging steel, thus makes forging reach fast cooling object.
Described online immersion adopts online immersion device to realize, and this device that soaks online also can realize the Quick uniform cooling of the forging steel after to forging.After this device that soaks online is arranged at footpath forging machine, the forging steel after the forging of footpath forging machine directly can be placed in online immersion device, thus realization cooling fast.Exemplarily, this device that soaks online is the tank being arranged at Duan Ji rear, footpath, and the forging after forging can directly put into this tank, thus makes forging reach fast cooling object.
In above-mentioned heat treating method, carrying out secondary isothermal spheroidizing in described step 2 is to meet in annealing furnace the steel having the temperature difference, steel are when furnace annealing, if annealing furnace temperature uniformity is bad, single isothermal spheroidizing temperature cannot adapt to the steel of each position in stove, evenly tiny tissue cannot be obtained, do not reach Spheroidizing Annealing effect, so have employed secondary isothermal spheroidizing.The temperature of described low temperature nodularization is preferably 700-730 DEG C, exemplary can be 700-710 DEG C, 720-730 DEG C, 715-725 DEG C, 728 DEG C; The temperature of described high-temperature nodularization is preferably 731-760 DEG C, exemplary can be 735-745 DEG C, 745-750 DEG C, 755-758 DEG C, 740 DEG C.
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 batch few optional short period of time, workpiece is large, and one time how optional batch is for a 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 DEG C/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 batch few optional short period of time, workpiece is large, and one time how optional batch is for a long time; The time of described high-temperature nodularization is 2-10 hour, and workpiece is little, and a batch few optional short period of time, workpiece is large, and one time how optional batch is for a long time.
In above-mentioned heat treating method, as a kind of preferred implementation, in described step 2, described cooling is that the cold mode of stove being not more than 30 DEG C/h by cooling rate is down to air cooling of coming out of the stove after below 600 DEG C.
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 improve forging material tissue; Forging material organizes rank to be improved, and the examination and test of products reaches more than A4 level in North America die casting association moulding stock standard NADCA207#; Production cycle shortens more than 20 hours; Labour cost and gas consumption cost have had obvious reduction.
Accompanying drawing explanation
Fig. 1 is through the metallographic structure figure of the H13 shaped steel after the inventive method thermal treatment.
Fig. 2 is the online waterworks structural representation used 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 used in following examples has following structure, see Fig. 2.It comprises: the cylindric support 1 of horizontal positioned, comprises two annulus 12 at two ends and is evenly erected at the pipeline 11 that the multiple and high-pressure water pipe (not shown) between two annulus is communicated with; And the multiple nozzles 2 be arranged on described multiple pipeline 11, the water spraying direction of described multiple nozzle 2 is all towards the central axis AA of described cylindric support 1, when forging steel to be cooled pass through along the direction of the central axis AA of cylindric support 1 from the inside of cylindric support 1, described multiple nozzle 2 by forging steel surface extremely to be cooled for high pressure water jets, thus realizes the cooling of forging steel.This waterworks can realize the cooling rate of 10-200 DEG C/min.
Embodiment 1
The steel of 520 square gauge lattice to be forged into the H13 shaped steel forging material of 250 compasses lattice;
Heat treating method is as follows:
Step one, forging machine in footpath is adopted to forge the steel that temperature before forging is 1170-1180 DEG C, parameter setting in footpath forging machine program is as follows: the draught of each passage is 20-40mm, corner is 10-30 °, the amount of feed is 20-50mm, each strike cycling time is 300-850ms, and stopping forging temperature is 900-950 DEG C, then adopts above-mentioned online waterworks that the forging steel after forging are quickly cooled to 250 DEG C;
Step 2, the forging steel processed through step one are put into annealing furnace, adopt the cold mode of stove of reduction of speed 20 DEG C/h to be cooled to 720 DEG C be incubated 20h under 860 DEG C of conditions after again and carry out low temperature isothermal spheroidizing 10h, be warming up to 740 DEG C again and carry out high temperature isothermal spheroidizing 10h, be then down to 500 DEG C of air coolings of coming out of the stove by reduction of speed 20 DEG C/h.
Adopt aforesaid method thermal treatment above-mentioned forging material 30 tons, the once rate of being up to the standards of its tissue is 100%, improve 40%, be up to the standards the metallographic structure figure of product see 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, B2 in NADCA207#, and rank is improved, and the inspection of H13 circle forging section product reaches more than A4 level in North America die casting association moulding stock standard NADCA207#.
Embodiment 2
The steel of 410 square gauge lattice to be forged into the H13 shaped steel forging material of 160 compasses lattice;
Heat treating method is as follows:
Step one, forging machine in footpath is adopted to forge the steel that temperature before forging is 1150-1160 DEG C, parameter setting in footpath forging machine program is as follows: the draught of each passage is 20-35mm, corner is 10-30 °, the amount of feed is 20-60mm, each strike cycling time is 300-800ms, and stopping forging temperature is 900-910 DEG C, then adopts above-mentioned online waterworks that the forging steel after forging are quickly cooled to 280 DEG C;
Step 2, the forging steel processed through step one are put into and adopts the cold mode of stove of reduction of speed 20 DEG C/h to be cooled to 720 DEG C again after annealing furnace is incubated 18h under 830 ~ 835 DEG C of conditions to carry out low temperature isothermal spheroidizing 10h, be warming up to 740 DEG C again and carry out high temperature isothermal spheroidizing 8h, be then down to 500 DEG C of air coolings of coming out of the stove by reduction of speed 20 DEG C/h.
Adopt aforesaid method thermal treatment above-mentioned forging material 50, the once rate of being up to the standards of its tissue is 100%, improves 30%, and the homogeneous microstructure of the product that is up to the standards is tiny, without block and strip eutectic carbides, and the tissue of crystal boundary non-net secondary Carbide Precipitation; Forging material organizes rank to be improved, and the inspection of H13 circle forging section product reaches more than A4 level in North America die casting association moulding stock standard NADCA207#.
Embodiment 3
The steel of flat for 200*450 specification to be forged into the H13 shaped steel forging material of the flat specification of 125*415;
Heat treating method is as follows:
Step one, forging machine in footpath is adopted to forge the steel that temperature before forging is 1165 DEG C, parameter setting in footpath forging machine program is as follows: the draught of each passage is 20-35mm, corner is 10 °, the amount of feed is 20-50mm, each strike cycling time is 300-800ms, and stopping forging temperature is 920-923 DEG C, then adopts above-mentioned online waterworks that the forging steel after forging are quickly cooled to 280 DEG C;
Step 2, the forging steel processed through step one are put into and adopts the cold mode of stove of reduction of speed 20 DEG C/h to be cooled to 720 DEG C again after annealing furnace is incubated 20h under 880 DEG C of conditions to carry out low temperature isothermal spheroidizing 10h, be warming up to 740 DEG C again and carry out high temperature isothermal spheroidizing 10h, then air cooling after slow cooling to 600 DEG C.
Adopt aforesaid method thermal treatment above-mentioned forging material 10, the once rate of being up to the standards of its tissue is 100%, improves 20%, and the homogeneous microstructure of the product that is up to the standards is tiny, without block and strip eutectic carbides, and the tissue of crystal boundary non-net secondary Carbide Precipitation; Forging material organizes rank to be improved, and the inspection of H13 flat forging section product reaches more than A4 level in North America die casting association moulding stock standard NADCA207#.
Should be appreciated that the purposes of these embodiments is only not intended to for illustration of the present invention limit the scope of the invention.In addition; also should understand; after having read technology contents of the present invention, those skilled in the art can make various change, amendment and/or modification to the present invention, and these all equivalent form of values fall within the protection domain that the application's appended claims limits equally.
Claims (8)
1. a heat treating method for H13 shaped steel, is characterized in that, comprises the steps:
Forging steel after adopting the forging of footpath forging machine are cooled to less than 300 DEG C by cross-sectional sizes with the speed of cooling of 10-200 DEG C/min by step one, and it is 900-950 DEG C that the stopping of wherein said footpath forging machine forges temperature; The draught of described footpath forging machine each passage in forging process controls at 10-50mm, and controlling angle is at 10-30 °, and the amount of feed controls at 20-60mm, and each strike controls at 300-1000ms cycling time;
Step 2, the forging steel processed through step one are put into annealing furnace, under 830 ~ 880 DEG C of conditions insulation after be cooled to again 700-760 DEG C carry out secondary isothermal spheroidizing after cool, described secondary isothermal spheroidizing refers to that then first low temperature nodularization heats up and carries out high-temperature nodularization; The temperature of described low temperature nodularization is 700-730 DEG C; The temperature of described high-temperature nodularization is 731-760 DEG C.
2. the heat treating method of H13 shaped steel according to claim 1, is characterized in that, in described step one, before the forging of described forging steel, temperature controls at 1100-1180 DEG C.
3. the heat treating method of H13 shaped steel according to claim 1, is characterized in that, in described step one, described forging steel are cooled to less than 300 DEG C and are realized by online spray mode or immersion mode.
4. the heat treating method of H13 shaped steel according to claim 3, it is characterized in that, described online spray mode is realized by online waterworks, after described online waterworks is arranged at described footpath forging machine, comprise: the cylindric support of horizontal positioned, comprise two annulus at two ends and be evenly erected at the pipeline that the multiple and high-pressure water pipe between two annulus is communicated with; And the multiple nozzles be arranged on described multiple pipeline, the water spraying direction of described multiple nozzle is all towards the central axis AA of described cylindric support.
5. 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.
6. 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 adopting reduction of speed to be not more than 30 DEG C/h is lowered the temperature.
7. 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.
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 being not more than 30 DEG C/h by cooling rate is down to air cooling of coming out of the stove after below 600 DEG C.
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| 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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| 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 |
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| 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 |
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Effective date of registration: 20200415 Address after: 435001 Huangshi Road, Hubei, Huangshi, No. 316 Patentee after: Daye Special Steel Co., Ltd Address before: 435001 Huangshi Road, Hubei, Huangshi, No. 316 Patentee before: DAYE SPECIAL STEEL Co.,Ltd. |