CN103540856B - A kind of 3Cr17NiMoV stainless steel strip and preparation method - Google Patents
A kind of 3Cr17NiMoV stainless steel strip and preparation method Download PDFInfo
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Abstract
The present invention is a kind of 3Cr17NiMoV stainless steel strip and preparation method, relate to a kind of technical field of stainless steel materials, its chemical element composition and quality % thereof are: the vanadium of the chromium of the carbon of the 0.30-0.40% ,≤silicon of the 0.60% ,≤manganese of the 0.60% ,≤phosphorus of the 0.025% ,≤sulphur of 0.015%, 16.00-17.50%, the nickel of 0.6-1.0%, the molybdenum of 0.80-1.30% and 0.72-0.76%, Yu Weitie, wherein: the gas content in steel is: [N]=200-400ppm, [H]≤2.5ppm, [O]=20-40ppm.Technical scheme provided by the invention to be selected rationally and the amount of hydrogen, oxygen and nitrogen obnoxious flavour controls proper due to chemical element and mass percentage thereof, has that hardness is high, wear resisting property is excellent, good corrosion resistance and desirable toughness.The preparation method provided has into that material is high and to be able to save energy, technical process short and can save energy, can guarantee quality by controlling and effectively remove harmful element and inclusion to hydrogen, oxygen and nitrogen obnoxious flavour content.
Description
Technical field
The present invention relates to a kind of technical field of stainless steel materials, be specifically related to a kind of 3Cr17NiMoV height polishing mirror-surface plastic die steel, and relate to the manufacture method of this high polishing mirror-surface plastic die steel.
Background technology
Along with science and technology and the improving constantly of living standards of the people, current die steel industry is all more and more higher for the requirement of the surface hardness of die steel material, purity and smooth finish, erosion resistance, wear resisting property, traditional die steel material can not meet the performance requirement of client for die steel material completely, and the performance factor of these die steel above-mentioned will affect mould product quality and all kinds of technical indicator greatly.In order to adapt to this new market requirement, a high polishing mirror-surface plastic die steel newly of our factory's independent research, namely 3Cr17NiMoV is in order to substitute original conventional plastic die steel.
Some general parts are had during Current Domestic external use plastic die steel, also some are had to distinguish, the DIN1.2316 of import all can select in most of mould manufacturer when the plastic mould material of production high-quality, manyly when producing general plastic mould material can select 2Cr13.Although present stage these two kinds selection can meet normal plastic die steel demand reluctantly, drawback is also fairly obvious: select the external import of DIN1.2316 heavy dependence, not only with high costs, and the crucial supply of material can not ensure in time; If select the key performance requirements such as the hardness of 2Cr13 material, purity, wear resisting property and corrosion resistance nature can not meet again the needs of high-quality.
China's mould of plastics manufacturer is all paying close attention to the key propertys such as the hardness of die steel, erosion resistance, wear resisting property, surperficial purity and smooth finish in view of the foregoing, to expect to break away from the long-term passive situation by the restriction of import factor.To this, our factory is from the autonomous angle of industry, and carried out long-term and positive exploration and trial, and finally succeeded, the technical scheme will introduced below is exactly produce under this background.
Summary of the invention
The object of the present invention is to provide a kind of formula rationally and contribute to embodying excellent hardness, wear resistance, erosion resistance, surperficial purity and smooth finish and use and break away from dependence on import and a kind of 3Cr17NiMoV stainless steel strip that significantly can reduce the use cost of user.
The present invention also aims to the preparation method that a kind of 3Cr17NiMoV stainless steel strip is provided, the method have into material high and use economize on resources, technical process is brief and use save energy without the need to frequently using electric energy to heat and harmful element effectively can be removed and the inclusion content in steel is significantly reduced and uses quality assurance.
The present invention is a kind of 3Cr17NiMoV stainless steel strip, its chemical element composition and quality % thereof are: the vanadium of the chromium of the carbon of the 0.30-0.40% ,≤silicon of the 0.60% ,≤manganese of the 0.60% ,≤phosphorus of the 0.025% ,≤sulphur of 0.015%, 16.00-17.50%, the nickel of 0.6-1.0%, the molybdenum of 0.80-1.30% and 0.72-0.76%, Yu Weitie, wherein: the gas content in steel is: [N]=200-400ppm, [H]≤2.5ppm, [O]=20-40ppm.
The present invention is a kind of preparation method of 3Cr17NiMoV stainless steel strip, comprises the following steps:
A) melting, by die steel steel scrap, carbon steel steel scrap and iron alloy drop into just refining in intermediate frequency furnace, obtain just making steel water, to just steel-making water sampling analysis and the quality % content of the first chemical element of steel-making water of adjustment, then be blended into the refining of LF refining furnace by just making steel water, oxygen blast gas and argon gas simultaneously, and control refining temperature and refining time and control Argon amount, obtain LF stove refined molten steel, the quality % content of the chemical element of LF stove refined molten steel adjusts to LF stove refined molten steel sampling analysis, again through VD vacuum oven to the hydrogen in steel, the gas content of oxygen and nitrogen controls, obtain cast steel water to be poured, treat casting liquid steel sampling analysis and and then adjust the chemical element quality % content of cast steel water to be poured,
B) cast, cast steel water to be poured is poured in special electroslag ingot mold, obtains electroslag bar;
C) electroslag, enters electroslag furnace and carries out esr, obtain the ESR ingot of refining again by electroslag bar;
D) forge, steel ingot is loaded process furnace heating, and control Heating temperature, send into forging hammer after going out process furnace and forge into corresponding size, obtain forging blank;
E) anneal, will forge in blank loading annealing furnace and heat, and control Heating temperature and control soaking time, naturally cooling after coming out of the stove;
F) sawing machine, is sawn into the blank that forges after annealing the various size facilitating hot rolling through sawing machine;
G) steel band rolling, will forge blank and load process furnace heating, and control Heating temperature, and send into hot rolls hot rolling, then obtain finished product after naturally cooling after going out process furnace.
Preferably, described steps A) described in adjustment just to make steel the quality % content of chemical element of water be adjusted to by the mass percentage of chemical element: the vanadium of the chromium of the carbon of the 0.30-0.40% ,≤silicon of the 0.60% ,≤manganese of the 0.60% ,≤phosphorus of the 0.025% ,≤sulphur of 0.015%, 16.00-17.50%, the nickel of 0.6-1.0%, the molybdenum of 0.80-1.30% and 0.72-0.76%, Yu Weitie.
Preferably, described steps A) described in control LF stove refining temperature and refining time be that refining temperature and time are controlled as 1540-1570 DEG C and 45-50min; Described control Argon amount controls Argon amount for 145-155m
3/ h.
Preferably, described steps A) described in be that the gas content of the hydrogen in steel, oxygen and nitrogen is controlled as [N]=200-400ppm through the Control of gas content of VD stove to the hydrogen in steel, oxygen and nitrogen, [H]≤2.5ppm, [O]=20-40ppm.
Preferably, the control mode of the described Control of gas content to the hydrogen in steel, oxygen and nitrogen is by the volume ratio of oxygen and argon gas being adjusted to successively the gas content that I phase 3: 0, II phase 3: 1, III phase 1: 3 and IV phase 0: 1 control hydrogen, oxygen and nitrogen in refined molten steel.
Preferably, described step D) in forge before to control Heating temperature be 1160 DEG C, heat-up time is 10 hours, and holding temperature is 600 DEG C, and soaking time is 6 hours.
Preferably, described step e) in when controlling annealing holding temperature be 850 DEG C, the heating-up time is 5 hours, and soaking time is 10 hours.
Preferably, described step G) in steel band is of a size of thick * wide after hot rolling is 18mm*270mm or 28mm*249mm.
Advantageous Effects of the present invention is: technical scheme provided by the invention to be selected rationally and the amount of hydrogen, oxygen and nitrogen obnoxious flavour controls proper due to chemical element and mass percentage thereof, and hardness (HRC) can reach 50-55 degree; Non-metallic inclusion reaches category-B 0.5 grade, C class 0.5 grade, D class 1 grade and DS class 1 grade; Rust-preventing characteristic (salt-fog test) reaches 1 grade; Have that hardness is high, wear resisting property is excellent, good corrosion resistance and desirable toughness.The preparation method provided has into that material is high and to be able to save energy, technical process short and can save energy, can guarantee quality by controlling and effectively remove harmful element and inclusion to hydrogen, oxygen and nitrogen obnoxious flavour content.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment 1:
To prepare the 3Cr17NiMoV stainless steel strip that width is 18mm for 270mm and thickness.
A) melting, by the die steel waste material that same steel grade or chemical composition are similar to, carbon steel or close knot steel waste material and progressively to join in intermediate frequency furnace according to different times through the good relevant iron alloy of accurate calculation and tentatively smelt, obtain just making steel water, to just steel-making water sampling analysis and the quality % content of the first chemical element of steel-making water of adjustment be: the carbon of 0.32%, the silicon of 0.46%, the manganese of 34%, the phosphorus of 0.013%, the sulphur of 0.006%, the chromium of 16.32%, the nickel of 0.68%, the molybdenum of 0.95% and the vanadium of 0.72%, Yu Weitie, to carry out removing the gred after the above-mentioned quality % content through sampling analysis and through adjusting chemical element and reduce thus show that composition is qualified, slag is white, the first steel-making water of good fluidity, the tapping temperature of first steel-making water controls at 1617 DEG C.Be blended in LF stove ladle carry out the refining of LF stove by just making steel water afterwards; criticize AD powder with 2-3 in refining furnace to reduce; residue adjustment adopts lime, fluorite; white and the good fluidity of slag after energising>=10min; keep this state>=15min; maintain the temperature at 1550-1580 DEG C; after concocting gold>=5min eventually; guarantee that chemical composition is qualified; slag is good; temperature 1600-1610 DEG C of termination LF stove refining process, in order to make the alloying element of molten steel and liquid steel temperature more even in ladle refining process, blows Ar continuously to ladle bottom
2, Ar
2pressure is 0.35MPa, flow is 145m
3/ h.Make just steel-making water obtain maximum refining, ensure that the temperature of molten steel is accurate, uniform composition, inclusion content is lower.Afterwards the molten steel through LF refining is hung in VD vacuum bell furnace and carry out vacuum pumping, by the optimization of technique, both ensure that the gas of nitrogen in steel, hydrogen, oxygen was effectively removed, and in turn ensure that the castability of molten steel, and finally obtained the molten steel to be cast of high-quality.In this process, pumpdown time is 15-20min maximum vacuum is 8pa, hydrogen in molten steel, the gas content of oxygen and nitrogen is respectively 24ppm, 27ppm and 22ppm, temperature reaches 1550-1580 DEG C, quality % content and the H of chemical element is adjusted again through sampling analysis, 02, N gas content obtains final molten steel to be poured, and treat the quality % content of casting liquid steel sampling analysis and adjustment chemical element, wherein: the quality % content of the quality % content of the chemical element of described adjustment refined molten steel and described adjustment cast steel water to be poured is adjusted to by the quality % content of chemical element: the carbon of 0.32%, the silicon of 0.46%, the manganese of 34%, the phosphorus of 0.013%, the sulphur of 0.006%, the chromium of 16.32%, the nickel of 0.68%, the molybdenum of 0.95% and the vanadium of 0.72%, Yu Weitie,
B) cast, by by steps A) the cast steel water to be poured that obtains pours in the special Electro Slag Remelting Steel ingot mould being preheated to 100-120 DEG C in advance, obtains electroslag bar;
C) esr, by by step B) electroslag bar that obtains enters in electroslag furnace and carries out esr and obtain ESR ingot;
D) forge, will by step C) the ESR ingot ingot that obtains loads process furnace heating, and Heating temperature is 1160 DEG C, heat-up time is 10 hours, and holding temperature is 600 DEG C, and soaking time is 6 hours, send into forging hammer after going out process furnace and forge into corresponding size, obtain forging blank
E) anneal, will by step D) blank that forges that obtains loads in annealing furnace and heats up, and warming temperature is 850 DEG C, and the heating-up time is 5 hours, reaches after 850 DEG C, is incubated 10 hours, then cools to less than 460 DEG C with the furnace, come out of the stove, naturally cool to normal temperature.
F) sawing machine, by by step e) obtain annealed forge the size that blank is sawn into applicable hot rolling.
G) steel band rolling, will by step F) blank that forges through sawing machine that obtains loads process furnace and is heated to 1150 DEG C, and send into hot rolls hot rolling after going out process furnace, rolling is of a size of thick 18mm, wide 270mm, then obtain finished product after naturally cooling: 3Cr17NiMoV stainless steel strip.
Embodiment 2:
To prepare the 3Cr17NiMoV stainless steel strip that width is 28mm for 249mm and thickness.
A) melting, by die steel steel scrap, carbon steel steel scrap and iron alloy drop into just refining in intermediate frequency furnace, obtain just making steel water, to just steel-making water sampling analysis and the quality % content of the first chemical element of steel-making water of adjustment be: the carbon of 0.34%, the silicon of 0.40%, the manganese of 32%, the phosphorus of 0.009%, the sulphur of 0.004%, the chromium of 16.25%, the nickel of 0.73%, the molybdenum of 0.92% and the vanadium of 0.74%, Yu Weitie, to carry out removing the gred after the above-mentioned quality % content through sampling analysis and through adjusting chemical element and reduce thus show that composition is qualified, slag is white, the first steel-making water of good fluidity, the tapping temperature of first steel-making water controls at 1615 DEG C.Be blended in LF stove ladle carry out the refining of LF stove by just making steel water afterwards; criticize AD powder with 2-3 in refining furnace to reduce; residue adjustment adopts lime, fluorite; white and the good fluidity of slag after energising>=10min; keep this state>=15min; maintain the temperature at 1550-1580 DEG C; after concocting gold>=5min eventually; guarantee that chemical composition is qualified; slag is good; temperature 1600-1610 DEG C of termination LF stove refining process, in order to make the alloying element of molten steel and liquid steel temperature more even in ladle refining process, blows Ar continuously to ladle bottom
2, Ar
2pressure is 0.35MPa, flow is 145m
3/ h.Afterwards the molten steel through LF refining is hung in VD vacuum bell furnace and carry out vacuum pumping, pumpdown time is 15-20min maximum vacuum is 10pa, hydrogen in molten steel, the gas content of oxygen and nitrogen is respectively [N]=252ppm, [H]=2.2ppm, [O]=26ppm, temperature reaches 1550-1580 DEG C, quality % content and the H of chemical element is adjusted again through sampling analysis, 02, N gas content obtains final molten steel to be poured, and treat the quality % content of casting liquid steel sampling analysis and adjustment chemical element, wherein: the quality % content of the quality % content of the chemical element of described adjustment refined molten steel and described adjustment cast steel water to be poured is adjusted to by the quality % content of chemical element: the carbon of 0.34%, the silicon of 0.40%, the manganese of 32%, the phosphorus of 0.009%, the sulphur of 0.004%, the chromium of 16.25%, the nickel of 0.73%, the molybdenum of 0.92% and the vanadium of 0.74%, Yu Weitie,
B) cast, by by steps A) the cast steel water to be poured that obtains pours in the special Electro Slag Remelting Steel ingot mould being preheated to 100-120 DEG C in advance, obtains electroslag bar;
C) esr, by by step B) electroslag bar that obtains enters in electroslag furnace and carries out esr and obtain ESR ingot;
D) forge, will by step C) the ESR ingot ingot that obtains loads process furnace heating, and Heating temperature is 1160 DEG C, heat-up time is 10 hours, and holding temperature is 600 DEG C, and soaking time is 6 hours, send into forging hammer after going out process furnace and forge into corresponding size, obtain forging blank
E) anneal, will by step D) blank that forges that obtains loads in annealing furnace and heats up, and warming temperature is 850 DEG C, and the heating-up time is 5 hours, reaches after 850 DEG C, is incubated 10 hours, then cools to less than 460 DEG C with the furnace, come out of the stove, naturally cool to normal temperature.
F) sawing machine, by by step e) obtain annealed forge the size that blank is sawn into applicable hot rolling.
G) steel band rolling, will by step F) blank that forges through sawing machine that obtains loads process furnace and is heated to 1150 DEG C, and send into hot rolls hot rolling after going out process furnace, rolling is of a size of thick 28mm, wide 249mm, then obtain finished product after naturally cooling: 3Cr17NiMoV stainless steel strip.
Compared with the prior art the 3Cr17NiMoV stainless steel strip of the present invention obtained by above-mentioned case study on implementation has the technique effect shown in following table.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (2)
1. a 3Cr17NiMoV stainless steel strip, is characterized in that, its chemical element composition and quality % thereof are:
The vanadium of the chromium of the carbon of the 0.30-0.40% ,≤silicon of the 0.60% ,≤manganese of the 0.60% ,≤phosphorus of the 0.025% ,≤sulphur of 0.015%, 16.00-17.50%, the nickel of 0.6-1.0%, the molybdenum of 0.80-1.30% and 0.72-0.76%, Yu Weitie, wherein:
Gas content in steel is: [N]=200-400ppm, [H]≤2.5ppm, [O]=20-40ppm.
2. a preparation method for 3Cr17NiMoV stainless steel strip, is characterized in that, comprises the following steps:
A) melting, by die steel steel scrap, carbon steel steel scrap and iron alloy drop into just refining in intermediate frequency furnace, obtain just making steel water, to just steel-making water sampling analysis and the quality % content of the first chemical element of steel-making water of adjustment, then be blended into the refining of LF refining furnace by just making steel water, oxygen blast gas and argon gas simultaneously, and control refining temperature and refining time and control Argon amount, obtain LF stove refined molten steel, the quality % content of the chemical element of LF stove refined molten steel adjusts to LF stove refined molten steel sampling analysis, again through VD vacuum oven to the hydrogen in steel, the gas content of oxygen and nitrogen controls, obtain cast steel water to be poured, treat casting liquid steel sampling analysis and and then adjust the chemical element quality % content of cast steel water to be poured,
B) cast, cast steel water to be poured is poured in special electroslag ingot mold, obtains electroslag bar;
C) electroslag, enters electroslag furnace and carries out esr, obtain the ESR ingot of refining again by electroslag bar;
D) forge, steel ingot is loaded process furnace heating, and control Heating temperature, send into forging hammer after going out process furnace and forge into corresponding size, obtain forging blank;
E) anneal, will forge in blank loading annealing furnace and heat, and control Heating temperature and control soaking time, naturally cooling after coming out of the stove;
F) sawing machine, is sawn into the blank that forges after annealing the various size facilitating hot rolling through sawing machine;
G) steel band rolling, will forge blank and load process furnace heating, and control Heating temperature, and send into hot rolls hot rolling, then obtain finished product after naturally cooling after going out process furnace;
Described steps A) described in adjustment just to make steel the quality % content of chemical element of water be adjusted to by the mass percentage of chemical element: the vanadium of the chromium of the carbon of the 0.30-0.40% ,≤silicon of the 0.60% ,≤manganese of the 0.60% ,≤phosphorus of the 0.025% ,≤sulphur of 0.015%, 16.00-17.50%, the nickel of 0.6-1.0%, the molybdenum of 0.80-1.30% and 0.72-0.76%, Yu Weitie;
Described steps A) described in control LF stove refining temperature and refining time be that refining temperature and time are controlled as 1540-1570 DEG C and 45-50min; Described control Argon amount controls Argon amount for 145-155m
3/ h;
Described steps A) described in be the gas content of the hydrogen in steel, oxygen and nitrogen is controlled as [N]=200-400ppm, [H]≤2.5ppm, [O]=20-40ppm through the Control of gas content of VD stove to the hydrogen in steel, oxygen and nitrogen
The control mode of the described Control of gas content to the hydrogen in steel, oxygen and nitrogen is by the volume ratio of oxygen and argon gas being adjusted to successively the gas content that I phase 3: 0, II phase 3: 1, III phase 1: 3 and IV phase 0: 1 control hydrogen, oxygen and nitrogen in refined molten steel;
Described step D) in forge before control Heating temperature be 1160 DEG C, heat-up time is 10 hours, and holding temperature is 600 DEG C, and soaking time is 6 hours;
Described step e) in control annealing time holding temperature be 850 DEG C, the heating-up time is 5 hours, and soaking time is 10 hours;
Described step G) in steel band is of a size of thick * wide after hot rolling is 18mm*270mm or 28mm*249mm.
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| CN103820711A (en) * | 2014-02-26 | 2014-05-28 | 常熟市长江不锈钢材料有限公司 | 5Cr13 stainless steel strip steel and preparation method thereof |
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| CN112226667B (en) * | 2020-09-30 | 2022-02-01 | 攀钢集团江油长城特殊钢有限公司 | Preparation method of chromium stainless pre-hard plastic die steel |
| CN113584380A (en) * | 2021-07-05 | 2021-11-02 | 昆山东大特钢制品有限公司 | High-hardness and high-toughness antirust die steel and production process thereof |
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