CN103484606A - Heat treatment method for improving low-temperature toughness of WC6-1.7357 material - Google Patents
Heat treatment method for improving low-temperature toughness of WC6-1.7357 material Download PDFInfo
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- CN103484606A CN103484606A CN201310405109.9A CN201310405109A CN103484606A CN 103484606 A CN103484606 A CN 103484606A CN 201310405109 A CN201310405109 A CN 201310405109A CN 103484606 A CN103484606 A CN 103484606A
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Abstract
The invention discloses a heat treatment method for improving the low-temperature toughness of a WC6-1.7357 material. The method comprises the following steps of placing a casting and a test block in a heat treatment furnace, gradually raising the temperature of the heat treatment furnace at speed which is controlled to be less than or equal to 120 DEG C per hour, stopping raising the temperature when the temperature of the heat treatment furnace reaches 940+/-10 DEG C, and keeping the temperature of the heat treatment furnace within the range of 940+/-10 DEG C; after the casting and the test block are naturally cooled to 860+/-10 DEG C along with the heat treatment furnace after heat preservation, preserving heat for 0.5 hour, taking the casting and the test block out of the heat treatment furnace, and placing the casting and the test block in a still pool for cooling, wherein the temperature of water is ranged from 30 to 55 DEG C; placing the casting and the test block in the heat treatment furnace again for treatment within 2 hours after the steps are finished, gradually raising the temperature of the heat treatment furnace at speed which is controlled to be less than or equal to 100 DEG C per hour, preserving the heat when the temperature of the heat treatment furnace reaches 720+/-10 DEG C, and removing the casting and the test block out of the heat treatment furnace for air cooling.
Description
Technical field:
This processing method relates to high-temperature bearing part alloy steel casting thermal treatment process, is a kind of high-temperature bearing part steel alloy specifically, need meet the requirement of low-temperature steel performance.Applicable high-temperature bearing part steel alloy (WC6-1.7357) composition range of the present invention is, by the element mass percent, and carbon: 0.15-0.20, manganese: 0.50-0.80, silicon :≤0.60; Phosphorus :≤0.020, sulphur :≤0.020, chromium: 1.00-1.50; Molybdenum: 0.45-0.65, nickel≤0.50, copper≤0.50, vanadium≤0.05, tungsten≤0.10, other element are slightly.
Background technology:
At present, the foundry goods that material is WC6-1.7357 has obtained two authentications of some external clients (as: French SRI, Germany three general etc.), and this material is originally to meet the high-temperature alloy steel performance requriements, and the client but will meet the low-temperature steel performance requriements now; Original heat treating castings normalizing+tempering process can not meet the requirement of client to this material low-temperature impact, if do not reach the requirement of low temperature impact properties, will lose client's order, to group, brings the loss on economy and fame.So be badly in need of finding a kind of practical heat treating method to improve the cold impact value that material is the WC6-1.7357 foundry goods.
Summary of the invention
The present invention seeks to adopt conventional thermal treatment process to be difficult to maybe can't guarantee the not enough problem of low-temperature impact of user's appointment in order to make up the WC6-1.7357 material; Substituting conventional " normalizing+tempering " technique by " quenching+tempering " technique, both improved the low-temperature impact toughness of product, improved again the stability of casting quality, is a novel heat-treatment technology method.
This processing method is achieved through the following technical solutions:
The present invention is for improving the heat-treatment technology method of WC6-1.7357 material low-temperature flexibility, and wherein: it comprises the following steps:
(1) foundry goods that is WC6-1.7357 by material and test block are placed on the quenching charging tray reposefully;
(2) the quenching charging tray that with crane or fork truck foundry goods and test block will be housed is packed in the heat treatment furnace of appointment, during shove charge, fire box temperature is answered≤350 ℃, then rise to 940 ± 10 ℃ and be incubated with the speed of≤120 ℃/hs in this temperature range, soaking time is calculated with the insulation of foundry goods maximum cross-section thickness per inch thickness in 1 hour, after insulation finishes, foundry goods and test block Ying Suilu are chilled to 860 ± 10 ℃, in this temperature range, insulation is come out of the stove to enter in " hydrostatic " after 0.5 hour and is carried out quench cooled, water temperature should be controlled at 30-55 ℃, " hydrostatic " refers to the not water through specially stirring,
(3) foundry goods and test block have operated within 2 hours in step (2), above-mentioned foundry goods and test block are reentered in heat treatment furnace and carry out temper, during shove charge fire box temperature must≤350 ℃, then rise to 720 ± 10 ℃ and be incubated with the speed of≤100 ℃/hs in this temperature range, soaking time is calculated with the insulation of foundry goods maximum cross-section thickness per inch thickness in 1 hour, after insulation finishes, the air cooling of coming out of the stove;
Of the present invention a kind of for improving the heat-treatment technology method of WC6-1.7357 material low-temperature flexibility, wherein: described heat treatment furnace is electric furnace or gas furnace;
Of the present invention a kind of for improving the heat-treatment technology method of WC6-1.7357 material low-temperature flexibility, wherein: in order to make the distortion minimum of foundry goods in heat treatment furnace, described foundry goods should be selected upright, edge-on or flat sleeping disposing way according to its constructional feature when shove charge;
Of the present invention a kind of for improving the process of thermal treatment method of WC6-1.7357 material low-temperature flexibility, wherein: described test block is when the Charpy impact test of making v-notch, at the temperature of-15 ℃ to-29 ℃, more than its Impact energy Ak v can reach 100J.
With traditional " normalizing+tempering " technique, compare, advantage of the present invention is:
(1): if adopt oil (or polymkeric substance) to quench, need be transformed existing heat treatment quenching equipment, and need the buying hardening liquid, increase the thermal treatment cost; This processing method, under the prerequisite that does not change heat treatment heating furnace, hardening liquid (water), quenching apparatus, can be carried out this thermal treatment process; Saved transformation equipment for Heating Processing cost, time, the shortening heat treatment cycle, complete product on time and hand over the phase;
(2) its material, after abundant austenitizing, is chilled in advance with stove the zone of closing on inferior temperature and is quenched; If direct high-temperature water quenching after the abundant austenitizing of foundry goods, foundry goods easily produces quenching crack, makes troubles to the product finishing in later stage, warehouse-in; The processing method that employing closes on intercritical hardening can effectively reduce quenching crack, shortens finishing, entry time.
(3) by " quenching+tempering " technology generations, for " normalizing+tempering " technique, its cold impact value high and stable (in Table 2), met customer requirement to this material, won follow-up order.
(4) this thermal treatment process is economic and practical, easy to operate, has feasibility;
In a word, this heat treating method can be saved the improvement cost of equipment for Heating Processing, reduces labour intensity and production cycle, reduce materials consumption, significantly improve the mechanical property of this steel alloy, eliminated the unsettled shortcoming of cold impact value, thereby improved the inner quality of foundry goods, obtained customer order.
The accompanying drawing explanation
Fig. 1 technique simplified schematic diagram.
Table 1 is the low-temperature impact test value contrast before and after part heat (batch) number process modification.
Embodiment
As shown in Figure 1, of the present inventionly for the heat-treating methods that improves WC6-1.7357 material low-temperature flexibility, comprise the following steps:
(1) foundry goods that is WC6-1.7357 by material and test block are placed on the quenching charging tray reposefully;
(2) the quenching charging tray that with crane or fork truck foundry goods and test block will be housed is packed in the heat treatment furnace of appointment, heat treatment furnace is electric furnace or gas furnace, in order to make the distortion minimum of foundry goods in heat treatment furnace, described foundry goods should be selected upright, edge-on or flat sleeping disposing way according to its constructional feature when shove charge, during shove charge, fire box temperature is answered≤350 ℃ (as shown in the point of the A in Fig. 1), then rise to 940 ± 10 ℃ (as shown in the AB sections in Fig. 1) with the speed of≤120 ℃/hs, and be incubated in this temperature range that (soaking time is calculated with foundry goods maximum cross-section thickness per inch thickness insulation in 1 hour, as shown in the BC section in Fig. 1), after insulation finishes, foundry goods and test block Ying Suilu are chilled to 860 ± 10 ℃ (as shown in the CD sections in Fig. 1), in 0.5 hour (as shown in the DE section in Fig. 1) of insulation in this temperature range, come out of the stove subsequently to enter in " hydrostatic " and carry out quench cooled (as shown in the EF section in Fig. 1), water temperature should be controlled at 30-55 ℃, " hydrostatic " refers to the not water through specially stirring.
(3) foundry goods and test block have operated within 2 hours in step (2), above-mentioned foundry goods and test block are reentered in heat treatment furnace and carry out temper, during shove charge fire box temperature must≤350 ℃ (as shown in the point of the G in Fig. 1), then rise to 720 ± 10 ℃ (as shown in the GH sections in Fig. 1) with the speed of≤100 ℃/hs and be incubated in this temperature range that (soaking time is calculated with the insulation of foundry goods maximum cross-section thickness per inch thickness in 1 hour, as shown in the HI section in Fig. 1), after insulation finishes, the air cooling of coming out of the stove (as shown in the IJ section in Fig. 1).
Due to impact toughness value that can not the direct-detection foundry goods, therefore will carry out same furnace treatment reason with foundry goods with the test block of stove cast, verify the impact value of foundry goods by the impact value of detection test specimen.Test block is when the Charpy impact test of making v-notch, and at the temperature of-15 ℃ to-29 ℃, its Impact energy Ak v can reach 100J above (in Table 1).As shown in table 1, after by processing method of the present invention, the foundry goods of WC6-1.7357 material being heat-treated, all over 100J, in the as-heat-treated condition hurdle of table 1, " NT " means the thermal treatment of being undertaken by prior heat treatment process (normalizing+tempering) to its value of Akv with the stove test block (with summer of V-shape opening than standard impact specimen); " QT " means the thermal treatment of carrying out with heat treating method of the present invention." WC6/1.7357 " in table 1 is " WC6-1.7357 " of the present invention.
Table 1
Above description is explanation of the invention, is not that limited range of the present invention is referring to claim, in the situation that, without prejudice to spirit of the present invention, the present invention can do the modification of appropriate form to the restriction of invention.
Claims (4)
1. one kind for improving the heat-treatment technology method of WC6-1.7357 material low-temperature flexibility, and it is characterized in that: it comprises the following steps:
(1) foundry goods that is WC6-1.7357 by material and test block are placed on the quenching charging tray reposefully;
(2) the quenching charging tray that with crane or fork truck foundry goods and test block will be housed is packed in the heat treatment furnace of appointment, during shove charge, fire box temperature is answered≤350 ℃, then rise to 940 ± 10 ℃ and be incubated with the speed of≤120 ℃/hs in this temperature range, soaking time is calculated with the insulation of foundry goods maximum cross-section thickness per inch thickness in 1 hour, after insulation finishes, foundry goods and test block Ying Suilu are chilled to 860 ± 10 ℃, in this temperature range, insulation is come out of the stove to enter in " hydrostatic " after 0.5 hour and is carried out quench cooled, and water temperature should be controlled at 30-55 ℃; " hydrostatic " refers to the not water through specially stirring;
(3) foundry goods and test block have operated within 2 hours in step (2), above-mentioned foundry goods and test block are reentered in heat treatment furnace and carry out temper, during shove charge fire box temperature must≤350 ℃, then rise to 720 ± 10 ℃ and be incubated with the speed of≤100 ℃/hs in this temperature range, soaking time is calculated with the insulation of foundry goods maximum cross-section thickness per inch thickness in 1 hour, after insulation finishes, the air cooling of coming out of the stove.
2. according to claim 1 a kind of for improving the heat-treatment technology method of WC6-1.7357 material low-temperature flexibility, it is characterized in that: described heat treatment furnace is electric furnace or gas furnace.
3. according to claim 1 a kind of for improving the heat-treatment technology method of WC6-1.7357 material low-temperature flexibility, it is characterized in that: in order to make the distortion minimum of foundry goods in heat treatment furnace, described foundry goods should be selected upright, edge-on or flat sleeping disposing way according to its constructional feature when shove charge.
4. according to claim 1 a kind of for improving the heat-treatment technology method of WC6-1.7357 material low-temperature flexibility, it is characterized in that: described test block is when the Charpy impact test of making v-notch, at the temperature of-15 ℃ to-29 ℃, more than its Impact energy Ak v reaches 100J.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104263885A (en) * | 2014-09-22 | 2015-01-07 | 安徽应流集团霍山铸造有限公司 | Heat treatment process for improving low-temperature toughness of castings |
| CN109439858A (en) * | 2018-11-23 | 2019-03-08 | 安徽应流铸业有限公司 | A kind of energy conservation and environmental protection process for quenching with water generation oil of double certification material casting |
| CN114959192A (en) * | 2022-06-09 | 2022-08-30 | 安徽应流集团霍山铸造有限公司 | Heat treatment process method for improving low-temperature impact toughness of low-carbon low-alloy steel |
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| CN104263885A (en) * | 2014-09-22 | 2015-01-07 | 安徽应流集团霍山铸造有限公司 | Heat treatment process for improving low-temperature toughness of castings |
| CN109439858A (en) * | 2018-11-23 | 2019-03-08 | 安徽应流铸业有限公司 | A kind of energy conservation and environmental protection process for quenching with water generation oil of double certification material casting |
| CN114959192A (en) * | 2022-06-09 | 2022-08-30 | 安徽应流集团霍山铸造有限公司 | Heat treatment process method for improving low-temperature impact toughness of low-carbon low-alloy steel |
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Application publication date: 20140101 |