CN102206739A - Dual-refinement treatment process of hot mould steel structure - Google Patents
Dual-refinement treatment process of hot mould steel structure Download PDFInfo
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Abstract
The invention relates to a dual-refinement treatment process of a hot mould steel structure, comprising the following steps of: firstly, heating an electroslag ingot subjected to electroslag remelting to 1200-1300 DEG C, preserving temperature for 6-10 hours, and then taking out of a furnace for air cooling; carrying out high-temperature homogenization treatment, and then carrying out recrystallization annealing treatment; heating the electroslag ingot subjected to the high-temperature homogenization treatment to 800-850 DEG C, preserving the temperature for 6-10 hours, and then cooling with the furnace; secondly, controlling the as-forged fast cooling of the hot mould steel; carrying out subsequent isothermal spheroidizing heat treatment; heating a material to be slightly higher than Acl temperature, and then preserving the temperature; then cooling to the temperature to approach to the Acl temperature at a cooling speed less than or equal to 30 DEG C/hour, and then preserving the temperature; then slowly cooling to 350 DEG C at the cooling speed less than or equal to 40 DEG C/hour, and then taking out of an annealing furnace for air cooling so that the tissues of the material are transformed into equilibrium-state tissues of a pearlite and a carbide; and further refining a crystalline grain and the carbide so as to achieve the purpose of dual-refinement. The hot mould steel subjected to dual-refinement treatment is outstandingly enhanced in obdurability and isotropy under the precondition of same rigidity due to small and uniform tissues after being subjected to the quenching and tempering treatment of the conventional process.
Description
Technical field
The present invention relates to the thermal treatment process of metallurgy industry steel alloy, refer in particular to the thermal treatment process of high-alloy hot work die steel.High-alloy hot work die steel is after organizing two refinement control techniquess processing, and its annealed structure is evenly tiny, and obdurability and tropism such as grade are significantly improved.
Background technology
The working conditions of hot-work die steel is abominable, needs to contact with the blank even the liquid metal of heating for a long time when work, and when red-hot metal was put into the hot-work die die cavity, mold cavity surface sharply heated up, and the top layer produces stress and compressive strain; When metalwork took out, mold cavity surface was subjected to tensile stress and stretching strain effect owing to rapid cooling, very easily produces thermal fatigue etc., and hot-work die steel also will be subjected to greater impact load under arms in the process.Therefore require moulding stock to have thermostability that high hot strength, hot hardness, impelling strength, hardening capacity become reconciled and cold-and-heat resistent fatigue property etc.The tissue of steel is most important to effect of material performance, especially for hot-work die steel, the segregation degree of annealed structure, the size of carbide, distribution situation etc., all the mechanical propertys such as hardness, impelling strength and thermostability to hot-work die steel have very big influence.High-alloy hot work die steel is the class high performance hot-work die steel that developed recently gets up, and has good thermotolerance, thermal fatigue resistance and heat resistanceheat resistant viscous deformation etc.But the alloy content height, matrix homogeneity and miniaturization control difficulty occurs the micro-area composition segregation easily and organizes thick etc., and the hardness height, mechanical workout is difficulty also, therefore, finished product die steel must carry out anneal, makes matrix even on the one hand, reduces its hardness on the other hand.(metallurgical industry press publishes in October, 1998 " the special steel book series-die steel " that people such as Xu Jin write, ISBN7-5024-2172-6) the hot-work die steel annealing method of narration is a kind of conventional annealing treatment process that generally uses in: at first hot-work die steel is put into the controlled atmosphere annealing furnace, be heated to 860 ℃-900 ℃ after insulation 25mm/h(mm be the thickness of material); Secondly be cooled to 500 ℃ with the speed of cooling that is less than or equal to 25 ℃/h; Last air cooling is to room temperature.High-alloy hot work die steel after this anneal, though hardness can drop to 180-230HB, satisfy mach requirement, but exist obviously not enough, as coarse microstructure, component segregation, especially pseudoeutectic carbide and proeutectoid carbide segregation, impelling strength directivity differ greatly, especially the horizontal notched bar impact strength extreme difference of heart portion.
Summary of the invention
The object of the present invention is to provide the two refinement thermal treatment process of a kind of high-alloy hot work die steel tissue, it is guaranteeing that the hot-work die steel annealing hardness is in 180-230HB, but the microstructure of miniaturization, homogenizing die steel, the obdurability and the tropism such as grade of die steel are significantly improved, thus the work-ing life of having improved finished product die steel.
The two thinning processing technologies of high-alloy hot work die steel tissue of the present invention, it is characterized in that: at first will be heated to 1200-1300 ℃ of insulation by the ESR ingot behind the esr and come out of the stove air cooling to room temperature after 6-10 hour, carrying out high temperature homogenization handles, elimination pseudoeutectic carbide also significantly improves the alloying element segregation in the steel, carrying out full annealed again handles, ESR ingot after the high-temperature homogenization processing is heated to 800-850 ℃ of insulation cools to room temperature with the furnace after 6-10 hour, improve the thick tissue behind the high temperature homogeneous, improved the forging processing technology in back road; Secondly, cooling fast after the forging of control hot-work die steel, suppress austenitic answer of deformation and recrystallize, the back tissue is forged in refinement, steel ingot after the annealing is heated to 1100-1150 ℃ of temperature begins to forge processing, stop forging temperature 〉=850 ℃, forging ratio 〉=6, residual forging heat carries out quenching oil and cools off fast; Follow-up isothermal spheroidizing thermal treatment, it is the thickness of material that promptly first heat-up rate with 100 ℃/h is heated to material a little more than Ac1 temperature (860 ℃-890 ℃) back insulation 25-35mm/h(mm), being cooled near Ar1 temperature (700-750 ℃) insulation 10-15mm/h(mm with the speed of cooling that is less than or equal to 30 ℃/h then is the thickness of material), slowly be chilled to 350 ℃ with the speed of cooling that is less than or equal to 40 ℃/h again and go out the annealing furnace air cooling, the structural transformation that makes material is the equilibrium state tissue of perlite and carbide, further crystal grain thinning and carbide, thus reach the purpose of two refinements.Through the hot-work die steel of two thinning processing, common process is quenched after the temper and since organize tiny evenly, under the same rigidity prerequisite, obdurability, etc. the tropism will significantly improve.
Description of drawings
Fig. 1 is the annealed structure after common H13 hot-work die steel is handled through routine techniques.
Fig. 2 is the annealed structure after common H13 hot-work die steel is handled through the technology of the present invention.
Embodiment
Now specific embodiments of the invention are described in down.
Embodiment
In this example, with the H13 hot-work die steel of current widespread use as research object.
1, the specific embodiment of H13 steel is as follows:
(1) high-temperature homogenization is handled: will be heated to 1250 ℃ of insulations by the ESR ingot behind the esr and come out of the stove air cooling to room temperature after 8 hours;
(2) full annealed: the ESR ingot behind the high temperature homogenization is put into annealing furnace be heated to 830 ℃ and anneal, annealing time is 8 hours, cools to room temperature then with the furnace;
(3) forge: the steel ingot after will annealing is heated to 1100 ℃ of temperature and begins to forge processing, stops forging temperature 〉=850 ℃, forging ratio 〉=6, and residual forging heat carries out quenching oil and cools off fast;
(4) isothermal spheroidizing: will forge the fast cold steel ingot in back and be heated to that insulation 30mm/h(mm is the thickness of material after 860 ℃), being cooled to 730 ℃ of insulation 10mm/h(mm with the speed of cooling that is less than or equal to 30 ℃/h then is the thickness of material), slowly be chilled to 350 ℃ with the speed of cooling that is less than or equal to 40 ℃/h again and go out the annealing furnace air cooling to room temperature.
2, metallographic structure
Accompanying drawing 1 is the annealed structure metallograph of common H13 steel, and the carbide in the tissue is tiny and be evenly distributed on the matrix as can be seen from Fig. 1 (b), and segregation phenomena is eliminated.
3, impact experiment
Get lateral impact sample on blank, specimen size is that 7mm * 10mm * 55mm(adopts North America die casting association criterion).
Impact toughness value 〉=300J at room temperature.
Claims (1)
1. two thinning processing technologies of a hot-work die structure of steel is characterized in that this treatment process has following steps:
A. high-temperature homogenization is handled: the ESR ingot of hot-work die steel after by esr is heated to 1200-1300 ℃ of insulation comes out of the stove air cooling to room temperature after 6-10 hour;
B. full annealed: the ESR ingot behind the high temperature homogenization is put into annealing furnace be heated to 800-850 ℃ and anneal, annealing time is 6-10 hour, cools to room temperature then with the furnace;
C. forge: the steel ingot after will annealing is heated to 1100-1150 ℃ of temperature and begins to forge processing, stops forging temperature 〉=850 ℃, forging ratio 〉=6, and residual forging heat carries out quenching oil and cools off fast;
D. isothermal spheroidizing: will forge and be incubated 25-35mm/h after the fast cold steel ingot in back is heated to 860 ℃-890 ℃, be cooled to 700-750 ℃ of insulation 10-15mm/h with the speed of cooling that is less than or equal to 30 ℃/h then, slowly be chilled to 350 ℃ with the speed of cooling that is less than or equal to 40 ℃/h again and go out the annealing furnace air cooling to room temperature.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382949A (en) * | 2011-11-21 | 2012-03-21 | 南昌大学 | Isothermal spheroidizing method for 5Cr5MoSiV1 steel for shield cutter |
| CN103333997A (en) * | 2013-07-02 | 2013-10-02 | 武汉钢铁(集团)公司 | Annealing heat treatment method of H13 die steel |
| CN103710506A (en) * | 2013-12-31 | 2014-04-09 | 常州中钢精密锻材有限公司 | Forging and annealing process for die steel |
| CN104060055A (en) * | 2013-03-18 | 2014-09-24 | 山西太钢不锈钢股份有限公司 | Annealing method of H13 forged materials |
| CN106048155A (en) * | 2016-07-16 | 2016-10-26 | 柳州科尔特锻造机械有限公司 | Forging waste heat equal-temperature annealing process for low alloy steel |
| CN106222376A (en) * | 2016-07-28 | 2016-12-14 | 柳州科尔特锻造机械有限公司 | A kind of AZ80 magnesium alloy steel heating in the forging |
| CN106238636A (en) * | 2016-07-28 | 2016-12-21 | 柳州科尔特锻造机械有限公司 | A kind of titanium micro-alloyed steel heating in the forging |
| CN106544592A (en) * | 2016-11-01 | 2017-03-29 | 辽宁乾金金属材料开发有限公司 | Obdurability hot die steel and its production method |
| CN106566997A (en) * | 2015-10-12 | 2017-04-19 | 宝钢特钢有限公司 | Hot work die steel for high-performance die-casting die and metallurgy manufacturing method thereof |
| CN107275909A (en) * | 2017-06-19 | 2017-10-20 | 温惟善 | One kind eliminates hermetically sealed connector electrode guide pillar gas leakage method |
| CN107574295A (en) * | 2017-10-17 | 2018-01-12 | 安徽金兰压铸有限公司 | Aluminium alloy casting die steel production technology |
| CN112961963A (en) * | 2020-12-25 | 2021-06-15 | 苏州奥维精密机械有限公司 | Preparation process for improving toughness of hot stamping die steel |
| CN113122684A (en) * | 2021-04-25 | 2021-07-16 | 中航上大高温合金材料股份有限公司 | Processing method for improving SDH13 performance of die steel |
| CN115354130A (en) * | 2022-09-15 | 2022-11-18 | 湖北上大模具材料科技股份有限公司 | Method for compositely refining grains of hot work die steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1924069A (en) * | 2006-09-21 | 2007-03-07 | 上海大学 | High heat-intensity hot-work die steel material |
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2011
- 2011-05-04 CN CN 201110113175 patent/CN102206739A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1924069A (en) * | 2006-09-21 | 2007-03-07 | 上海大学 | High heat-intensity hot-work die steel material |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382949A (en) * | 2011-11-21 | 2012-03-21 | 南昌大学 | Isothermal spheroidizing method for 5Cr5MoSiV1 steel for shield cutter |
| CN102382949B (en) * | 2011-11-21 | 2015-10-28 | 南昌大学 | A kind of isothermal spheroidizing method of shield cutter steel 5Cr5MoSiV1 |
| CN104060055A (en) * | 2013-03-18 | 2014-09-24 | 山西太钢不锈钢股份有限公司 | Annealing method of H13 forged materials |
| CN103333997A (en) * | 2013-07-02 | 2013-10-02 | 武汉钢铁(集团)公司 | Annealing heat treatment method of H13 die steel |
| CN103333997B (en) * | 2013-07-02 | 2014-12-10 | 武汉钢铁(集团)公司 | Annealing heat treatment method of H13 die steel |
| CN103710506A (en) * | 2013-12-31 | 2014-04-09 | 常州中钢精密锻材有限公司 | Forging and annealing process for die steel |
| CN106566997A (en) * | 2015-10-12 | 2017-04-19 | 宝钢特钢有限公司 | Hot work die steel for high-performance die-casting die and metallurgy manufacturing method thereof |
| CN106566997B (en) * | 2015-10-12 | 2018-03-30 | 宝钢特钢有限公司 | A kind of high-performance compression mod hot die steel metallurgical manufacturing method |
| CN106048155A (en) * | 2016-07-16 | 2016-10-26 | 柳州科尔特锻造机械有限公司 | Forging waste heat equal-temperature annealing process for low alloy steel |
| CN106222376A (en) * | 2016-07-28 | 2016-12-14 | 柳州科尔特锻造机械有限公司 | A kind of AZ80 magnesium alloy steel heating in the forging |
| CN106238636A (en) * | 2016-07-28 | 2016-12-21 | 柳州科尔特锻造机械有限公司 | A kind of titanium micro-alloyed steel heating in the forging |
| CN106544592A (en) * | 2016-11-01 | 2017-03-29 | 辽宁乾金金属材料开发有限公司 | Obdurability hot die steel and its production method |
| CN106544592B (en) * | 2016-11-01 | 2018-05-18 | 辽宁乾金金属材料开发有限公司 | obdurability hot die steel and its production method |
| CN107275909A (en) * | 2017-06-19 | 2017-10-20 | 温惟善 | One kind eliminates hermetically sealed connector electrode guide pillar gas leakage method |
| CN107275909B (en) * | 2017-06-19 | 2018-11-13 | 温惟善 | A kind of elimination hermetically sealed connector electrode guide post gas leakage method |
| CN107574295A (en) * | 2017-10-17 | 2018-01-12 | 安徽金兰压铸有限公司 | Aluminium alloy casting die steel production technology |
| CN112961963A (en) * | 2020-12-25 | 2021-06-15 | 苏州奥维精密机械有限公司 | Preparation process for improving toughness of hot stamping die steel |
| CN113122684A (en) * | 2021-04-25 | 2021-07-16 | 中航上大高温合金材料股份有限公司 | Processing method for improving SDH13 performance of die steel |
| CN115354130A (en) * | 2022-09-15 | 2022-11-18 | 湖北上大模具材料科技股份有限公司 | Method for compositely refining grains of hot work die steel |
| CN115354130B (en) * | 2022-09-15 | 2024-03-12 | 湖北上大模具材料科技股份有限公司 | Method for compositely refining grains of hot work die steel |
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Application publication date: 20111005 |