CN101717892B - Hot die steel and tempering process thereof - Google Patents
Hot die steel and tempering process thereof Download PDFInfo
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- CN101717892B CN101717892B CN2009101554583A CN200910155458A CN101717892B CN 101717892 B CN101717892 B CN 101717892B CN 2009101554583 A CN2009101554583 A CN 2009101554583A CN 200910155458 A CN200910155458 A CN 200910155458A CN 101717892 B CN101717892 B CN 101717892B
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Abstract
The invention relates to hot die steel which comprises the following components in percentage by weight: 0.32-0.42 percent of carbon, 0.2-0.5 percent of silicon, 0.2-0.5 percent of manganese, 2.2-2.7 percent of chromium, 1.0-3.4 percent of molybdenum, 0.8-2.2 percent of tungsten, 0.4-0.6 percent of vanadium, 0.2-1.5 percent of cobalt and the balance of Fe. A tempering process of the hot die steel comprises the following steps of: firstly, tempering at 440-460 DEG C for 1-2 hours and then cooling to room temperature; then tempering at 520-560 DEG C for 1-2 hours and then cooling to room temperature; and finally, tempering at 520-560 DEG C for 1-2 hours and then cooling to room temperature. The hot die steel has the characteristics of high heat resistance and high toughness. The tempering process greatly reduces the fracture speed of materials and further improves the toughness of die materials.
Description
(1) technical field
The present invention relates to the hot-work die steel and the tempering process thereof of a kind of high heat-intensity, high tenacity.
(2) background technology
Along with the development of automobile industry and relevant industries, more and more higher to the processing request of spare and accessory parts, a lot of spare and accessory parts have adopted the mold production of not having cutting.Performance requriements to hot-work die steel is: have higher thermostability, higher high temperature strength and enough toughness are arranged, good cold-and-heat resistent fatigue strength is arranged, good oxidation-resistance and solidity to corrosion are arranged.
Hot-work die is bearing very big pressure and impact loading at work, and frequency of impact is very high, die cavity contacts with hot metal, also to stand heating and cooling repeatedly, under sometimes cold and sometimes hot state, make the working-surface of mould produce heat fatigue cracking easily, when red-hot in addition metal is forced to be out of shape, with the mold cavity surface friction, mould very easily weares and teares and hardness reduces.Hot-work die is mainly used in the mould of thermal distortion processing and pressure die casting.The 3Cr2W8V steel is the high hot-work die steel of a kind of typical heat resistance, and this steel is introduced existing more than 60 year history by USSR (Union of Soviet Socialist Republics), uses with the passing of time and very extensive.Traditional 3Cr2W8V steel, its advantage are that heat resistance is good, and shortcoming is that toughness is easy to crack inadequately, poor thermal conductivity, and plasticity, thermal fatigue property are all undesirable, the linear expansivity height.Because dies cavity is complex-shaped, working conditions is abominable in the work.Mould is subjected to impacting greatly and friction, simultaneously since with processed hot metal Long contact time, working temperature can reach 400 ℃～600 ℃, also will be subjected to spraying into the chilling effect of die cavity refrigerant on the other hand, mould is in causes mould to produce thermal fatigue under the rapid heat cycle state.Be easy to produce very big thermal stresses, cause mould to produce be full of cracks even break, and easy decarburization during heating, the mould wear resistance reduced.The hot-work die steel of a kind of high-strong toughness of market in urgent need substitutes the 3Cr2W8V steel.The 3Cr2W8V steel can not adapt to the growing requirement of hot-work die steel.Therefore should belong to superseded steel grade, will by new, require higher hot-work die steel to replace.Currently marketed other hot strong type hot-work die steel can not substitute the 3Cr2W8V steel again fully.Can develop novel hot strong type hot-work die steel and substitute the 3Cr2W8V steel, be the direction that each scientific research institution and relevant enterprise are made great efforts.
(3) summary of the invention
Technical problem to be solved by this invention be to provide a kind of can substitute and performance be better than the high heat-intensity of 3Cr2W8V steel, the hot-work die steel of high tenacity fully.
Technical problem to be solved by this invention also is to provide a kind of tempering heat treatment technology of described hot-work die steel.
A kind of hot-work die steel is made up of following component: carbon 0.32%～0.42%, silicon 0.2%～0.5%, manganese 0.2%～0.5% by mass percentage, chromium 2.2%～2.7%, molybdenum 1.0%～3.4%, tungsten 0.8%～2.2%, vanadium 0.4%～0.6%, cobalt 0.2%～1.5%, surplus is Fe.
Preferably, form by following component by mass percentage: carbon 0.32%～0.42%, silicon 0.2%～0.5%, manganese 0.2%～0.5%, chromium 2.2%～2.7%, molybdenum 2.3%～2.8%, tungsten 1.2～1.7%, vanadium 0.4%～0.6%, cobalt 0.9%～1.2%, surplus is Fe.
Hot-work die steel of the present invention allows to contain inevitably and is mingled with, as S, P etc.
Hot-work die steel of the present invention has following technical characterstic:
(1) composition of C, Si, Mn and Cr and 3Cr2W8V steel is consistent substantially;
(2) substitute about 6% W with about 3% Mo, but keep the W about 1.5%, (the molten carbide of 3Cr2W8V is about 5% so just can to significantly reduce molten carbide behind the austenitizing of heat treatment process, and not molten carbide of the present invention is about 1.5%), thus the toughness after the thermal treatment improved;
(3) owing to after replacing W with Mo, reduced the carbide total amount of steel, thus the raising of the toughness of steel, but its hot strength has been subjected to influence again, so the Co that the present invention adds again about 1-1.5% improves intensity;
(4) content of V is chosen in 0.4-0.6%, compares with 3Cr2w8v, suitably heightens a bit, its objective is the raising wear resistance, but does not influence the fusion of primary carbide in the Forge Heating process.
A kind of tempering process of above-mentioned hot-work die steel comprises the steps: that elder generation 440～460 ℃ of tempering 1～2 hour, is cooled to room temperature; And then, be cooled to room temperature 520 ℃～560 ℃ tempering 1～2 hour; 520 ℃～560 ℃ tempering 1～2 hour, be cooled to room temperature at last.
Tempering process major objective of the present invention is to allow the material after the thermal treatment keep a certain amount of about 5% residual austenite, thereby reduces the crack propagation velocity of material greatly, with the toughness of further raising moulding stock.By adopting tempering heat treatment technology of the present invention, make very small and dispersed of carbide that quenched martensite separates out, and mould further self-tempering and secondary hardening occurs in the process under arms, thereby reach the purpose that increases the service life.
(1) carry out tempering with about 450 ℃ temperature for the first time, purpose is when tempering, and the carbide that quenched martensite is separated out is small and dispersed very, also has the carbon of part to enter residual austenite simultaneously, improves residual austenitic stability.
(2) reach the tempering between 520 ℃～560 ℃ of tempering for the third time for the second time, its objective is the hardness and the intensity that improve matrix, simultaneously again can the retained part residual austenite, owing to be the hot-work die material, in use the skin temperature of mould surpasses more than 500 ℃, therefore the material on mould top layer can obtain further tempering again and secondary hardening occur, thereby reaches the purpose that increases the service life.
Hot-work die steel of the present invention has high heat-intensity, high tenacity characteristics, adopts tempering process of the present invention to greatly reduce the crack propagation velocity of material, has further improved the toughness of moulding stock.
(4) embodiment
Below by specific embodiment technical scheme of the present invention is done further to describe in detail, but protection scope of the present invention is not limited to this.
Embodiment 1～5
The hot-work die steel raw material of the present invention of preparation shown in the according to the form below 1 gets hot-work die steel by the traditional technology smelting.
A kind of tempering process of above-mentioned hot-work die steel comprises the steps: that elder generation 450 ℃ of tempering 1.5 hours, is cooled to room temperature; And then, be cooled to room temperature 540 ℃ of tempering 1～2 hour; 550 ℃ of tempering 1.5 hours, be cooled to room temperature at last.
Table 1 unit (Wt%)
| ? | C | Si | S | P | Mn | Cr | V | W | Mo | Co | Fe |
| Embodiment 1 | 0.32 ～ 0.42 | 0.2～ 0.5 | ≤ 0.03 | ≤ 0.03 | 0.2～ 0.5 | 2.2～ 2.7 | 0.4～ 0.6 | 0.8～ 1.2 | 1.0～ 1.5 | 0.2～ 0.5 | Surplus |
| Embodiment 2 | 0.32 ～ 0.42 | 0.2～ 0.5 | ≤ 0.03 | ≤ 0.03 | 0.2～ 0.5 | 2.2～ 2.7 | 0.4～ 0.6 | 0.8～ 1.2 | 1.0～ 1.5 | 0.6～ 0.9 | Surplus |
| Embodiment 3 | 0.32 ～ 0.42 | 0.2～ 0.5 | ≤ 0.03 | ≤ 0.03 | 0.2～ 0.5 | 2.2～ 2.7 | 0.4～ 0.6 | 1.2～ 1.7 | 1.7～ 2.2 | 0.9～ 1.2 | Surplus |
| Embodiment 4 | 0.32 ～ 0.42 | 0.2～ 0.5 | ≤ 0.03 | ≤ 0.03 | 0.2～ 0.5 | 2.2～ 2.7 | 0.4～ 0.6 | 1.2～ 1.7 | 2.3～ 2.8 | 0.9～ 1.2 | Surplus |
| Embodiment 5 | 0.32 ～ 0.42 | 0.2～ 0.5 | ≤ 0.03 | ≤ 0.03 | 0.2～ 0.5 | 2.2～ 2.7 | 0.4～ 0.6 | 1.7～ 2.2 | 2.9～ 3.4 | 1.2～ 1.5 | Surplus |
Embodiment 6 impelling strength contrast experiments
The hot-work die steel of embodiment 1～5 and 3Cr2w8V are carried out average impelling strength contrast experiment under the different hardness (HRC), if experiment is as shown in table 2 below.
Table 2 size of sample 7 * 10 units: (J/cm
2)
Can reach a conclusion from the contrast of impelling strength, each composition of the present invention all will substantially exceed the 3Cr2w8V steel under different hardness (HRC).
Embodiment 7 life-span contrast experiment
Under different industries, different environment for use with the hot-work die steel of embodiment 1～5 and the life-span contrast experiment of 3Cr2w8V steel die, if the experiment as shown in table 3 below.
Table 3 unit: (part)
Experimental data shows that hot-work die steel of the present invention all is higher than the 3Cr2w8V steel far away in the different occasion life-spans.
Claims (2)
1. the tempering process of a hot-work die steel, it is characterized in that: described hot-work die steel is made up of following component by mass percentage: carbon 0.32%～0.42%, silicon 0.2%～0.5%, manganese 0.2%～0.5%, chromium 2.2%～2.7%, molybdenum 2.3%～2.8%, tungsten 1.2～1.7%, vanadium 0.4%～0.6%, cobalt 0.9%～1.2%, surplus is Fe; Described tempering process comprises the steps: that elder generation 440～460 ℃ of tempering 1～2 hour, is cooled to room temperature; And then, be cooled to room temperature 520 ℃～560 ℃ tempering 1～2 hour; 520 ℃～560 ℃ tempering 1～2 hour, be cooled to room temperature at last.
According to the described hot-work die steel of claim 1 tempering process, it is characterized in that comprising the steps: earlier being cooled to room temperature 450 ℃ of tempering 1.5 hours; And then, be cooled to room temperature 540 ℃ of tempering 1～2 hour; 550 ℃ of tempering 1.5 hours, be cooled to room temperature at last.
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| CN2009101554583A CN101717892B (en) | 2009-12-14 | 2009-12-14 | Hot die steel and tempering process thereof |
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| CN2009101554583A CN101717892B (en) | 2009-12-14 | 2009-12-14 | Hot die steel and tempering process thereof |
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| CN101717892B true CN101717892B (en) | 2011-07-20 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102719758A (en) * | 2012-06-25 | 2012-10-10 | 山东理工大学 | Anti-oxidation and anti-thermal fatigue hot working die steel and manufacturing method thereof |
| CN105274443B (en) * | 2014-05-27 | 2017-05-24 | 宝钢特钢有限公司 | Mold forging steel and preparation method thereof |
| CN104313462A (en) * | 2014-09-28 | 2015-01-28 | 宝山钢铁股份有限公司 | High wear-resistant hot-stamping die steel and manufacturing method thereof |
| CN109852880A (en) * | 2019-01-10 | 2019-06-07 | 上海大学 | A kind of high heat-intensity hot-work die steel and its manufacturing method |
| CN113088634A (en) * | 2021-03-18 | 2021-07-09 | 广州市型腔模具制造有限公司 | High-temperature tempering process for communication part die steel |
| CN113403531B (en) * | 2021-05-24 | 2022-05-24 | 如皋市宏茂重型锻压有限公司 | High-heat-strength high-toughness hot-work die steel and manufacturing process thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6280685B1 (en) * | 1998-04-02 | 2001-08-28 | Aubert & Duval | Tool steel composition |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6280685B1 (en) * | 1998-04-02 | 2001-08-28 | Aubert & Duval | Tool steel composition |
Non-Patent Citations (1)
| Title |
|---|
| 戴玉梅等.热处理对工模具钢5Cr8MoVSi组织及硬度的影响.《特殊钢》.2003,第24卷(第6期),第2.3节. * |
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