CN110923574A - Low-carbon easy-to-weld corrosion-resistant plastic die steel and manufacturing method thereof - Google Patents

Low-carbon easy-to-weld corrosion-resistant plastic die steel and manufacturing method thereof Download PDF

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Publication number
CN110923574A
CN110923574A CN201911281102.4A CN201911281102A CN110923574A CN 110923574 A CN110923574 A CN 110923574A CN 201911281102 A CN201911281102 A CN 201911281102A CN 110923574 A CN110923574 A CN 110923574A
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equal
percent
forging
die steel
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CN201911281102.4A
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Inventor
孙振环
陈俸军
王兴旺
薛正国
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Henan Zhongyuan Special Steel Equipment Manufacturing Co Ltd
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Henan Zhongyuan Special Steel Equipment Manufacturing Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention relates to low-carbon easily-welded corrosion-resistant plastic die steel which comprises the following chemical components in percentage by mass: the invention also relates to a manufacturing method of the plastic die steel, which comprises the steps of smelting in an electric furnace, vacuum refining, ingot casting, supercooling, heating, forging forming, air-cooled quenching after forging and tempering, and the plastic die steel with easy welding, corrosion resistance and hardness (39-42 HRC) is produced.

Description

Low-carbon easy-to-weld corrosion-resistant plastic die steel and manufacturing method thereof
Technical Field
The invention belongs to the technical field of plastic die steel, and particularly relates to low-carbon easily-welded corrosion-resistant plastic die steel and a manufacturing method thereof.
Background
The plastic mould is an important equipment material in the plastic molding processing industry, has large demand and various varieties and specifications, and occupies a large proportion in mould steel. Plastic die steel is generally required to have certain strength, hardness, wear resistance and corrosion resistance, and also required to have good cutting processability, polishing performance, etching processability and the like. With the rapid development of the mold industry, higher requirements are put forward on the mold manufacturing period, and easily-welded plastic mold steel is gradually applied in the market, such as XPM, Nimax which is a one hundred-year-old instant welding material and the like.
Disclosure of Invention
The invention aims to overcome the defect of poor cavitation resistance of an easily-welded plastic die in the prior art and provide low-carbon easily-welded corrosion-resistant plastic die steel with high corrosion resistance and a manufacturing method thereof
The technical scheme of the invention is realized as follows:
the low-carbon easy-welding corrosion-resistant plastic die steel comprises the following chemical components in percentage by mass: less than or equal to 0.15 percent of C, less than or equal to 0.40 percent of Si, less than or equal to 1.20 percent of Mn, less than or equal to 1.20 percent of Ni, less than or equal to 4.00-6.00 percent of Cr, less than or equal to 0.50 percent of Mo, less than or equal to 0.12 percent of V, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.01-0.03 percent of B, and the balance of Fe and other inevitable impurities, wherein the microstructure of the raw materials.
The preparation method of the low-carbon easy-welding corrosion-resistant plastic die steel comprises the following steps:
step 1), smelting: smelting in an electric furnace, vacuum refining, ingot casting, demoulding steel ingots, air cooling to 400-500 ℃, and then heating in the furnace;
step 2), forging: heating the steel ingot which is air-cooled to 400-500 ℃ to 1200-1230 ℃, preserving heat, forging, wherein the upsetting ratio is not less than 2.0, the forging ratio is not less than 5.0, the final forging temperature is controlled to be 850-900 ℃, and the final forging deformation is controlled to be 15-25%;
step 3), quenching treatment: quickly airing the die block forged to the specified shape to 150-250 ℃ to obtain a martensite structure with higher hardness;
step 4), tempering: and (3) putting the module cooled to 150-250 ℃ into a tempering furnace, waiting for material in the tempering furnace at 200-250 ℃, heating to 480-500 ℃ at a speed of less than or equal to 80 ℃/h, preserving heat for a certain time, then air-cooling to room temperature, heating to 480-520 ℃ at a speed of less than or equal to 80 ℃/h, tempering, preserving heat for a certain time, discharging, and air-cooling to room temperature.
The technical scheme of the invention has the following positive effects: on the basis of welding the NIMAX plastic die steel, the Cr content is increased to 4.00-6.00% so as to improve the corrosion resistance; reducing the Mn content to below 1.20% to maintain weldability while mitigating adverse effects on grain coarsening and temper brittleness; small amounts of V and B were added to compensate for the effect of reduced Mn content on the deterioration of hardenability. Through the adjustment of the alloy components, the total sum of the alloy components is equivalent to the total sum of the NiMAX alloy components, the material can keep the due instant welding performance of the NIMAX material according to the equivalent requirement of the welding performance on the alloy components, meanwhile, the original poor corrosion resistance characteristic of the NIMAX material is improved due to the improvement of the Cr content of the corrosion-resistant alloy, the hardness of the material after being subjected to pre-hardening treatment after being forged can be kept at about 40HRC, and the hardness requirement of the market on the material can be met.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific embodiments, but the scope of the present invention is not limited thereto.
Example 1: the low-carbon easy-welding corrosion-resistant plastic die steel comprises the following chemical components in percentage by mass: c: 0.11%, Si: 0.32%, Mn: 1.05%, Ni: 0.92%, Cr: 5.10%, Mo: 0.35%, V: 0.08%, P: 0.012%, S: 0.006%, B: 0.020%, and the balance of Fe and other inevitable impurities.
According to the chemical component ratio, the preparation method of the low-carbon easy-welding corrosion-resistant plastic die steel comprises the following steps: electric furnace smelting, vacuum refining, ingot casting, demoulding and air cooling of 9 tons of steel ingots to 456 ℃, then conveying the steel ingots to a heating furnace for heat preservation at 1230 +/-10 ℃, forging, wherein the upsetting ratio is 2.12, the drawing ratio is 6.53, the final forging temperature is 865 ℃, the specification of a forging blank is 205 multiplied by 980 (thickness multiplied by width) module blanks, and the final forging deformation amount is controlled to be 20 percent within 1 time; air cooling to 180 ℃ after forging, then waiting for material in a tempering furnace at 200-250 ℃, then raising the temperature to 480 ℃ at the speed of less than or equal to 80 ℃/h for tempering and preserving the temperature for a certain time, then air cooling to room temperature, raising the temperature to 500 ℃ at the speed of less than or equal to 80 ℃/h for tempering, preserving the temperature for a certain time, then discharging from the furnace and air cooling to room temperature.
Detecting the section hardness of 39-42 HRC; the welding performance is excellent and the corrosion resistance is superior to NIMAX after trial by users.
Example 2: the low-carbon easy-welding corrosion-resistant plastic die steel comprises the following chemical components in percentage by mass: c: 0.10%, Si: 0.33%, Mn: 0.98%, Ni: 0.94%, Cr: 5.12%, Mo: 0.36%, V: 0.09%, P: 0.011%, S: 0.007%, B: 0.021%, and the balance Fe and other inevitable impurities.
According to the chemical component ratio, the preparation method of the low-carbon easy-welding corrosion-resistant plastic die steel comprises the following steps: electric furnace smelting, vacuum refining, ingot casting, demoulding and air cooling of 12 tons of steel ingots to 437 ℃, then conveying the steel ingots to a heating furnace for heat preservation at 1230 +/-10 ℃, forging, wherein the upsetting ratio is 2.12, the drawing ratio is 6.53, the finish forging temperature is 870 ℃, the specification of a forging blank is 305 multiplied by 1010 (thickness multiplied by width) module blanks, and the final forging deformation amount is controlled to be 20 percent within 1 heat; air cooling to 210 ℃ after forging, then waiting for material in a tempering furnace at 200-250 ℃, then raising the temperature to 480 ℃ at the speed of less than or equal to 80 ℃/h for tempering and preserving the temperature for a certain time, then air cooling to room temperature, raising the temperature to 500 ℃ at the speed of less than or equal to 80 ℃/h for tempering, preserving the temperature for a certain time, then discharging from the furnace and air cooling to room temperature.
Detecting the section hardness of 39-42 HRC; the welding performance is excellent and the corrosion resistance is superior to NIMAX after trial by users.
Example 3: the low-carbon easy-welding corrosion-resistant plastic die steel comprises the following chemical components in percentage by mass: c: 0.12%, Si: 0.36%, Mn: 1.02%, Ni: 0.93%, Cr: 4.95%, Mo: 0.41%, V: 0.11%, P: 0.011%, S: 0.006%, B: 0.018%, and the balance of Fe and other inevitable impurities.
According to the chemical component ratio, the preparation method of the low-carbon easy-welding corrosion-resistant plastic die steel comprises the following steps: electric furnace smelting, vacuum refining, ingot casting, demoulding and air cooling of 15 tons of steel ingots to 462 ℃, then carrying out heat preservation on the steel ingots in a heating furnace at 1230 +/-10 ℃ and then forging, wherein the upsetting ratio is 2.12, the drawing ratio is 6.53, the finish forging temperature is 875 ℃, the specification of a forging blank is 405 multiplied by 1010 (thickness multiplied by width) module blanks, and the final forging deformation amount is controlled to be 20 percent within 1 heat; air cooling to 230 ℃ after forging, then waiting for material in a tempering furnace at 200-250 ℃, then raising the temperature to 480 ℃ at the speed of less than or equal to 80 ℃/h for tempering and preserving the temperature for a certain time, then air cooling to room temperature, raising the temperature to 500 ℃ at the speed of less than or equal to 80 ℃/h for preserving the temperature for a certain time, and then discharging from the furnace and air cooling to room temperature.
The section hardness is detected to be 39-42 HRC, and the section hardness is tried out by users, so that the welding performance is excellent, and the corrosion resistance is superior to NIMAX.

Claims (2)

1. The low-carbon easy-welding corrosion-resistant plastic die steel is characterized in that: the die steel comprises the following chemical components in percentage by mass: less than or equal to 0.15 percent of C, less than or equal to 0.40 percent of Si, less than or equal to 1.20 percent of Mn, less than or equal to 1.20 percent of Ni, less than or equal to 4.00-6.00 percent of Cr, less than or equal to 0.50 percent of Mo, less than or equal to 0.12 percent of V, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.01-0.03 percent of B, and the balance of Fe and other inevitable impurities, wherein the microstructure of the raw materials.
2. The preparation method of the low-carbon easy-welding corrosion-resistant plastic die steel as claimed in claim 1, characterized by comprising the following steps: the method comprises the following steps:
step 1), smelting: smelting in an electric furnace, vacuum refining, ingot casting, demoulding steel ingots, air cooling to 400-500 ℃, and then heating in the furnace;
step 2), forging: heating the steel ingot which is air-cooled to 400-500 ℃ to 1200-1230 ℃, preserving heat, forging, wherein the upsetting ratio is not less than 2.0, the forging ratio is not less than 5.0, the final forging temperature is controlled to be 850-900 ℃, and the final forging deformation is controlled to be 15-25% in 1-fire forging;
step 3), quenching treatment: quickly airing the die block forged to the specified shape to 150-250 ℃ to obtain a martensite structure with higher hardness;
step 4), tempering: and (3) putting the module cooled to 150-250 ℃ into a tempering furnace, waiting for material in the tempering furnace at 200-250 ℃, heating to 480-500 ℃ at a speed of less than or equal to 80 ℃/h, preserving heat for a certain time, then air-cooling to room temperature, heating to 480-520 ℃ at a speed of less than or equal to 80 ℃/h, tempering, preserving heat for a certain time, discharging, and air-cooling to room temperature.
CN201911281102.4A 2019-12-13 2019-12-13 Low-carbon easy-to-weld corrosion-resistant plastic die steel and manufacturing method thereof Pending CN110923574A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0250910A (en) * 1988-08-15 1990-02-20 Nippon Steel Corp Production of steel plate for die having good heat fatigue characteristic
CN101956144A (en) * 2010-11-01 2011-01-26 机械科学研究总院先进制造技术研究中心 Heat treatment method for manufacturing Martensitic-ferrite plastic mould steel
CN104532167A (en) * 2014-12-29 2015-04-22 芜湖金龙模具锻造有限责任公司 Preparation method of high temperature-resistant alloy die steel
CN104611645A (en) * 2014-12-29 2015-05-13 芜湖金龙模具锻造有限责任公司 High-temperature-resistant alloy die steel
CN105002433A (en) * 2015-06-26 2015-10-28 中原特钢股份有限公司 Anti-cavitation age-hardening high-polishability plastic die steel and preparation method thereof
CN106086691A (en) * 2016-05-13 2016-11-09 如皋市宏茂重型锻压有限公司 A kind of boron micro-alloyed mould steel and preparation technology thereof
CN109811251A (en) * 2018-10-26 2019-05-28 如皋市宏茂重型锻压有限公司 A kind of high polishing pre-hardening mould steel and its preparation process

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0250910A (en) * 1988-08-15 1990-02-20 Nippon Steel Corp Production of steel plate for die having good heat fatigue characteristic
CN101956144A (en) * 2010-11-01 2011-01-26 机械科学研究总院先进制造技术研究中心 Heat treatment method for manufacturing Martensitic-ferrite plastic mould steel
CN104532167A (en) * 2014-12-29 2015-04-22 芜湖金龙模具锻造有限责任公司 Preparation method of high temperature-resistant alloy die steel
CN104611645A (en) * 2014-12-29 2015-05-13 芜湖金龙模具锻造有限责任公司 High-temperature-resistant alloy die steel
CN105002433A (en) * 2015-06-26 2015-10-28 中原特钢股份有限公司 Anti-cavitation age-hardening high-polishability plastic die steel and preparation method thereof
CN106086691A (en) * 2016-05-13 2016-11-09 如皋市宏茂重型锻压有限公司 A kind of boron micro-alloyed mould steel and preparation technology thereof
CN109811251A (en) * 2018-10-26 2019-05-28 如皋市宏茂重型锻压有限公司 A kind of high polishing pre-hardening mould steel and its preparation process

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