CN102808135A - Rolled steel for hot working die including in-die bent water channel and thermal treatment method thereof - Google Patents
Rolled steel for hot working die including in-die bent water channel and thermal treatment method thereof Download PDFInfo
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Abstract
The invention discloses rolled steel for a hot working die including an in-die bent water channel and a thermal treatment method thereof. The rolled steel consists of the following chemical components in percentage by weight: 0.57-0.63 percent of C, 0.30-0.50 percent of Si, 0.40-0.50 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.025 percent of S, 7.80-7.90 percent of Cr, 2.20-2.40 percent of Ni, 1.50-1.60 percent of Mo, 0.20-0.30 percent of V, 0.08-0.12 percent of Nb, 0.60-0.80 percent of Cu and the balance of Fe. Due to the adoption of the chemical components and the thermal treatment method disclosed by the invention, an obtained casting has the advantages of high hardness, higher physical property, higher heat strength, high red hardness, high oxidation resistance, high thermal stability and high thermal fatigue resistance.
Description
Technical field
What the present invention relates to is a kind of steel, the present invention also relates to a kind of heat treating method of steel.Specifically a kind of to be used for High Strength Steel Plate hot press-formed, and contain the steel and the heat treating method thereof of the hot-work die of crooked water channel cooling system in the mould.
Background technology
The hot-work die that contains crooked water channel cooling system can be used for the hot press-formed of High Strength Steel Plate.This technology is applicable to industry, especially automobile industries such as boats and ships, automobile, rail vehicle.Because the requirement of low-carbon environment-friendly, above-mentioned industry is pursued the inexorable trend that lightweight becomes development, causes the consumption of High Strength Steel Plate to increase severely thus, and this has proposed higher requirement to press tool and corresponding die steel.Adopt hot stamping method to be best suited for manufacturing process in such sheet material.The mould factor is the maximum restraining factors that hot stamped process is implemented, and the hot-work die that adopts crooked water channel internal cooling system is the optimal selection that addresses this problem.In such mould, moulding stock is a deciding factor, is related to performance, production efficiency and the maintainability of mould.Thereby the hot-work die steel that development is suitable for such mould becomes the hot press-formed necessary ways that realize High Strength Steel Plate.
Summary of the invention
The object of the present invention is to provide a kind of good hardness that has, higher mechanical property and heat resistance, the steel that are used to contain crooked water channel hot-work die in the mould of good red hardness, oxidation-resistance, thermostability and thermal fatigue resistance.The present invention also aims to provide a kind of heat treating method that is used to contain the steel of crooked water channel hot-work die in the mould.
The objective of the invention is to realize like this:
The weight ratio chemical constitution that is used to contain the steel of crooked water channel hot-work die in the mould of the present invention is: C0.57%-0.63%, Si0.30%-0.50%, Mn0.40%-0.50%, P≤0.030%, S≤0.025%, Cr7.80%-7.90%, Ni2.20%-2.40%, Mo1.50%-1.60%, V0.20%-0.30%, Nb0.08%-0.12%, Cu0.60-0.80%, surplus is Fe.
The heat treating method that is used to contain the steel of crooked water channel hot-work die in the mould of the present invention comprises annealing, quenching and three processes of tempering; The method of said annealing process is: shove charge below 200 ℃, and heat-up rate≤80 ℃/hour are incubated under 860 ℃ of temperature, and insulation back stove is chilled to 300 ℃, the air cooling of coming out of the stove then; The method of said quenching process is: shove charge below 200 ℃, and heat-up rate≤80 ℃/hour are incubated under 1100 ℃ of temperature, then oil quenching; The method of said drawing process is: shove charge below 200 ℃, heat-up rate≤80 ℃/hour are incubated the air cooling of coming out of the stove at last under 300 ℃ of temperature.
The invention provides a kind of casting hot-work die steel, this die steel institute molding jig is used for the hot press-formed of High Strength Steel Plate, and mould contains crooked water channel cooling system.
The preparation of steel of the present invention at first is to assign to prepare burden according to one-tenth.Combine concrete other operations that die workpiece carried out to comprise melting, casting, cleaning thermal treatment, sandblast, polishing and mechanical workout and surface treatment etc. again.Wherein melting method both can be common Medium frequency induction melting, also can be vacuum induction melting, arc melting etc.
The present invention is based on the material design of carrying out according to the use background and the operating mode of material; And having carried out experiment test confirms with improving; Target is to obtain martensite for leading and contain a small amount of bainite structure, and material has the good mechanical performance, is suitable for the environment for use of mould.Carbon content in the employing, purpose are to improve the hardness and the intensity of material.The Cr content that adopts is in order to obtain martensitic stucture, to strengthen to realize martensitic transformation.Adopt V, Nb element to carry out compound precipitation hardened.Adopt elements such as Cr, Mo, Ni to carry out solution strengthening, improve the high-temperature behavior and the erosion resistance of steel.The adding of copper can improve the oxidation-resistance of steel, is beneficial to martensitic transformation.Through the comprehensive action of each element, can improve red hardness, oxidation-resistance, thermostability and the thermal fatigue resistance of material.
Adopt chemical ingredients of the present invention and heat treating method, resulting foundry goods has the following advantages: good hardness, higher mechanical property and heat resistance, good red hardness, oxidation-resistance, thermostability and thermal fatigue resistance.
Die steel of the present invention solved hot stamping forming die in hot press-formed process because harsh a series of problems that applying working condition produced; Solved simultaneously the mould internal cooling system in process of cooling owing to wash away wearing and tearing and etching problem to material production, thereby be suitable for the handling characteristics of mould.
Embodiment
For example the present invention is done more detailed description below:
Adopt common Medium frequency induction melting method to obtain to be used to contain the steel of crooked water channel hot-work die in the mould, furnace charge comprises, the pig iron, steel scrap, ferrosilicon, ferromanganese, extra low carbon ferrochromium etc., and concrete charge composition is seen table 1:
Each furnace charge add-on (kg) of table 1
The furnace charge chemical ingredients satisfies the requirement of table 2:
Table 2 furnace charge chemical ingredients (%)
Use the 80kg molten steel to process a weight foundry goods and four clover leaf coupons as 45kg.Foundry goods and plum blossom sample to after the cast carry out the finished product direct reading spectrometry, and the result is as shown in table 3.
The chemical ingredients of table 3 foundry goods and coupon (wt%)
| C | Si | Mn | P | S | Cr | Mo | Ni | V | Nb | Cu |
| 0.62 | 0.49 | 0.43 | 0.026 | 0.013 | 7.89 | 1.61 | 2.21 | 0.28 | 0.066 | 0.74 |
The plum blossom sample is carried out the mechanics property analysis after process heat is handled, adopt three to draw three to dash, average, the result is as shown in table 4.The thermal treatment process that is adopted comprises: annealing, quenching and tempering, and in conjunction with manufacturing process's reasonable disposition of mould.Annealing process is: shove charge below 200 ℃, and heat-up rate≤80 ℃/hour, 860 ℃ of holding temperatures, soaking time confirm that according to the particular case of workpiece insulation back stove is chilled to 300 ℃, the air cooling of coming out of the stove then.Quenching technology is: shove charge below 200 ℃, and heat-up rate≤80 ℃/hour, 1100 ℃ of holding temperatures, soaking time confirm according to the particular case of workpiece, then oil quenching.Tempering process is: shove charge below 200 ℃, and heat-up rate≤80 ℃/hour, 300 ℃ of holding temperatures, soaking time is confirmed the air cooling of coming out of the stove at last according to the particular case of workpiece.
The mechanical property of table 4 material
| As-heat-treated condition | Annealing | Quenching+tempering |
| Ys (N/mm 2) | 405 | 670 |
| Tensile strength (N/mm 2) | 620 | 760 |
| Unit elongation (%) | 1.2 | 0.35 |
| Shrinking percentage (%) | 19.5 | 15.5 |
| Hardness (HRC) | 39 | 57 |
| Ballistic work (J) | 9 | 4 |
Claims (2)
1. steel that are used to contain crooked water channel hot-work die in the mould; It is characterized in that the weight ratio chemical constitution is: C 0.57%-0.63%, Si 0.30%-0.50%, Mn 0.40%-0.50%, P≤0.030%, S≤0.025%, Cr 7.80%-7.90%, Ni 2.20%-2.40%, Mo 1.50%-1.60%, V 0.20%-0.30%, Nb 0.08%-0.12%, Cu 0.60-0.80%, surplus is Fe.
2. a heat treating method that is used to contain the steel of crooked water channel hot-work die in the mould is characterized in that: comprise annealing, quenching and three processes of tempering; The method of said annealing process is: shove charge below 200 ℃, and heat-up rate≤80 ℃/hour are incubated under 860 ℃ of temperature, and insulation back stove is chilled to 300 ℃, the air cooling of coming out of the stove then; The method of said quenching process is: shove charge below 200 ℃, and heat-up rate≤80 ℃/hour are incubated under 1100 ℃ of temperature, then oil quenching; The method of said drawing process is: shove charge below 200 ℃, heat-up rate≤80 ℃/hour are incubated the air cooling of coming out of the stove at last under 300 ℃ of temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210240527.2A CN102808135B (en) | 2012-07-12 | 2012-07-12 | Rolled steel for hot working die including in-die bent water channel and thermal treatment method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210240527.2A CN102808135B (en) | 2012-07-12 | 2012-07-12 | Rolled steel for hot working die including in-die bent water channel and thermal treatment method thereof |
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| CN102808135A true CN102808135A (en) | 2012-12-05 |
| CN102808135B CN102808135B (en) | 2015-02-25 |
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| CN201210240527.2A Active CN102808135B (en) | 2012-07-12 | 2012-07-12 | Rolled steel for hot working die including in-die bent water channel and thermal treatment method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005206913A (en) * | 2004-01-26 | 2005-08-04 | Daido Steel Co Ltd | Alloy tool steel |
| CN101629267A (en) * | 2007-10-31 | 2010-01-20 | 大同特殊钢株式会社 | Alloy tool steel and manufacturing method thereof |
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- 2012-07-12 CN CN201210240527.2A patent/CN102808135B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005206913A (en) * | 2004-01-26 | 2005-08-04 | Daido Steel Co Ltd | Alloy tool steel |
| CN101629267A (en) * | 2007-10-31 | 2010-01-20 | 大同特殊钢株式会社 | Alloy tool steel and manufacturing method thereof |
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| CN102808135B (en) | 2015-02-25 |
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