CN107760983B - A kind of production method of low-alloy super-strength steel and its casting - Google Patents

A kind of production method of low-alloy super-strength steel and its casting Download PDF

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CN107760983B
CN107760983B CN201610679441.8A CN201610679441A CN107760983B CN 107760983 B CN107760983 B CN 107760983B CN 201610679441 A CN201610679441 A CN 201610679441A CN 107760983 B CN107760983 B CN 107760983B
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casting
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temperature
iron
steel
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CN107760983A (en
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陈赞
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JIANGSU DINGTAI ENGINEERING MATERIALS Co Ltd
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JIANGSU DINGTAI ENGINEERING MATERIALS Co Ltd
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Priority to CN201910054898.3A priority patent/CN109504903B/en
Priority to CN201910054022.9A priority patent/CN109554617B/en
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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
    • 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
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium

Abstract

The present invention relates to the production methods of a kind of low-alloy super-strength steel and its casting, which is matched using low-carbon and various alloying elements, and higher trace niobium element is added, and refine crystal grain, homogenize tissue；After heat treatment, its hardness and wearability are greatly improved, while reasonably combining its strength and toughness, makes it have good comprehensive mechanical property and processing performance；The mechanical property of low carbon alloy cast steel of the present invention is as follows: tensile strength 1300 to 1500Mpa, yield strength 900MPa to 1200MPa, elongation >=10%, room temperature v-notch Charpy pendulu impact experiment Impact energy Ak >=40J, Brinell hardness 390-460HBW.

Description

A kind of production method of low-alloy super-strength steel and its casting
Technical field
The present invention relates to metal smelt technical field, the particularly productions of a kind of low-alloy super-strength steel and its casting Method.
Background technique
With the rapid development of industry, engineering machinery just develops towards the direction in high-end forward position, this is just to the performance of material It puts forward higher requirements.Low-alloy cast steel has alloy content low (alloying element total amount≤5%), from a wealth of sources, comprehensive mechanics The features such as performance is good, manufacturing process is simple, at low cost is a kind of good engineering material of application prospect.Superhigh intensity low-alloy Cast steel not only has high-intensitive and high rigidity, but also has good toughness and impact resistance.Patent CN20141024122.4 Disclose it is a kind of prepare low-alloy high-strength cast steel using electric arc furnaces, electric arc furnaces has very strong fusing, oxidation and reducing power, smelting Gold is very capable, and composition adjustment is convenient, but arc melting is serious to the scaling loss of element, and energy consumption is high, and working environment is relatively Difference；And the requirement in the essential industries field such as be unable to satisfy aerospace, rail traffic, national defence.
Intermediate frequency furnace heating speed is fast, high production efficiency, aoxidizes few de- charcoal, saving material and cost, extends the mold longevity Life, and intermediate frequency furnace homogeneous heating, the core table temperature difference is minimum, and accuracy of temperature control is high, and working environment is superior, realizes low pollution, low Energy consumption meets the green production of country's proposition to improve worker laboring environment and corporate image, is becoming of developing at present, enterprise Gesture.Specific preparation process includes: that intermediate frequency furnace melting+quiescence in high temperature refining obtains high temperature and return then by Tempering and Quenching Fiery sorbite finally prepares low-alloy super-strength cast steel, can be widely used in aerospace, rail traffic, national defence Etc. essential industries field.
Summary of the invention
It is low that the purpose of the present invention is to provide a kind of comprehensive mechanical properties is superior, casting and forming is easy, production process is few The tensile strength of the production method of alloy unimach and its casting, the low-alloy super-strength steel is not less than 1300MPa.
The technical scheme is that a kind of low-alloy super-strength steel, composition by weight percent include:
C:0.20% ~ 0.30%；
Si:0.50% ~ 0.70%；
Mn:0.60% ~ 0.80%；
Cr:0.60% ~ 1.10%；
Ni:0.40% ~ 0.65%；
Mo:0.50% ~ 0.75%；
Nb:0.05% ~ 0.15%；
V:0.03% ~ 0.05%；
Ti:0.001% ~ 0.003%；
Al:0.01% ~ 0.03%；
Cu:0.02% ~ 0.05%；
P≤0.010%；
S≤0.010%；
Surplus is iron and inevitable impurity.
The reasons why determining above-mentioned main chemical compositions is as follows:
Carbon: C content is too high, then will form more crisp tissue, reduces the low-temperature impact toughness of steel, and in drawing process, C contains Measuring higher steel will form coarseer carbide, to deteriorate its impact property；On the other hand, C content is too low, easy to form The lower tissue of ferrite equal strength；Therefore, in order to ensure that the low-temperature impact toughness and weldability of steel, carbon content are preferably 0.20%~0.30%.
Silicon: silicon can significantly improve the elastic limit of steel, yield point and tensile strength, as the formation element of chromium equivalent, It is combined with molybdenum, chromium etc., the corrosion resistance and inoxidizability of steel can be improved, therefore silicone content is controlled 0.50% ~ 0.70%.
Manganese: Mn is weak carbide formation element, is usually solid-solubilized in steel, plays the effect of solution strengthening.Increase manganese content The hardness of steel can be improved, but manganese content is excessively high, will affect the toughness of steel, therefore is preferably 0.60% ~ 0.80% by manganese content.
Chromium: chromium is ferrite former, can significantly improve intensity, but reduce plasticity and toughness simultaneously；Therefore chromium Content be preferably 0.60% ~ 1.10%.
Nickel: nickel is strong austenite former, increases the stability that nickel content helps to improve austenite structure, can mention The intensity of high material, and keep good plasticity and toughness；Therefore preferably 0.40% ~ 0.65%.
Molybdenum: Mo element is solid-solubilized in steel in austenitizing, thin by inhibiting diffusion Interface Motion to realize in cooling procedure Change final tissue；The free energy that Mo element dissipates to diffusion interface effect of dragging is approximately 3 times of Mn element, can by solution strengthening To improve the strength of materials, it is 0.50% ~ 0.75% that molybdenum content, which is preferably controlled in,.
Niobium: can refine crystal grain and reduce the superheated susceptivity and temper brittleness of material, improve intensity, can also improve welding Performance, but Nb content is higher can form coarseer NbC in drawing process and be precipitated, to reduce the low-temperature impact work of material； Therefore the content of niobium element is preferably 0.05% ~ 0.15%.
Vanadium: V is ferritisey, strongly diminution austenitic area.The V element that high temperature dissolves in austenite can increase steel Harden ability.The carbide V4C3 of V element is more stable in steel, can inhibit crystal boundary is mobile to grow up with crystal grain；Therefore vanadium Content be preferably 0.03% ~ 0.05%.
Titanium: Ti and N form TiN at high temperature, and when heating of plate blank austenitizing, TiN can inhibit Austenite Grain Growth.Ti TiC is formed in lower temperature section with C, tiny TiC particles benefit is in the low temperature impact properties for improving material.Ti content mistake Height then will form coarse rectangular TiN and be precipitated, and material stress in stress is concentrated near TiN particle, becomes micro-crack Forming core is grown up source, and the fatigue behaviour of steel plate is reduced.Therefore the content of titanium elements is preferably 0.001% ~ 0.003%.
Aluminium: Al element forms tiny AlN at high temperature and is precipitated, and can inhibit Austenite Grain Growth, reach austenite It refines crystal grain, improve the toughness of steel at low temperature.The excessively high oxide that will lead to biggish Al of Al content is formed, and steel plate is reduced Low temperature impact properties, hot-working character, welding performance and cutting performance, thus the content of aluminium element be preferably 0.01% ~ 0.03%。
Copper: copper can improve intensity and toughness, the disadvantage is that being easy to produce in hot-working hot-short, copper content is more than 0.5% plasticity It significantly reduces；It therefore is preferably 0.02% ~ 0.05% by the content of copper.
Sulphur, phosphorus: the impurity element during alloy smelting.
The production method of above-mentioned low-alloy super-strength steel casting, includes the following steps:
A, it opens mid-frequency melting furnace and debugs, high-purity pig iron is added and is melted, fluorite is added after high-purity pig iron is melting down Carry out slagging-off 2 times to 3 times.
B, after the completion of slagging-off, proportioned carburant is added into molten iron and carries out carburetting.
C, boost source voltage heats up to mid-frequency melting furnace, and nickel plate, chromic carbide iron, molybdenum are first added according to predetermined ratio Iron, mid-carbon fe-mn, ferrosilicon add fine copper, ferro-niobium, vanadium iron and stand, and add fluorite and carry out slagging-off 3-5 times, and remove the gred temperature Control is at 1650 DEG C ± 10 DEG C.
D, it is continuously heating to 1700 DEG C after the completion of slagging-off and keeps the temperature standing refining, sampling carries out stokehold spectral test, according to Spectral test is as a result, adjust molten steel component, so that the alloy element component in molten steel satisfaction meets C:0.20% ~ 0.30%；Si: 0.50%~0.70%；Mn:0.60% ~ 0.80%；Cr:0.60% ~ 1.10%；Ni:0.40% ~ 0.65%；Mo:0.50% ~ 0.75%；Nb: 0.05%~0.15%；V:0.03% ~ 0.05%；Ti:0.001% ~ 0.003%；Al:0.01% ~ 0.03%；Cu:0.02% ~ 0.05%；P≤ 0.010%；The requirement of S≤0.010%.
E, it adjusts to after meeting mentioned component demand, the tapping temperature of molten steel is controlled at 1610-1650 DEG C, it will be melted Molten steel all come out of the stove to ladle, thermometric makes temperature control at 1560~1580 DEG C, then carries out bottom pour ladle casting.
F, the casting of moulding by casting need to carry out finished product heat treatment, be heat-treated as normalizing, quenching+high tempering, to obtain High tempering Soxhlet body tissue.
Further, in the step F, heat treatment process are as follows: normalizing temperature 50 DEG C, i.e., 880 to 910 more than Ac3 temperature ℃；Hardening heat control is at 880 to 920 DEG C, and tempering temperature is controlled at 550 to 650 DEG C, the soaking time of each heat treatment stages Rule of thumb formula and practical work piece size determine.
Further, in the step E, bottom pour ladle casting is carried out using resin sand sand mold, casting and molding sand are easy to after being poured Separation, can reduce the workload of casting cleaning, and sand used in process can regenerate recycling and use, energy conservation and environmental protection.
Heretofore described low-alloy cast steel is matched using low-carbon and various alloying elements, and is added higher micro Niobium element refines crystal grain, homogenizes tissue.After heat treatment, its hardness and wearability are greatly improved, while reasonably being combined Its strength and toughness makes it have good comprehensive mechanical property and processing performance.Low carbon alloy cast steel of the present invention Mechanical property is as follows: 1300 ~ 1500Mpa of tensile strength, yield strength 900MPa ~ 1200MPa, elongation >=10%, room temperature V-type Impact energy Ak >=40J, the Brinell hardness 390-460HBW of notch Charpy pendulu impact experiment.
The strong low-alloy cast steel of superelevation containing niobium of of the invention 1500MPa grades of tensile strength not only has high-intensitive and height hard Degree, and there is good toughness and impact resistance.It is refined using intermediate frequency furnace melting+quiescence in high temperature, is then passed through Finished product heat treatment, acquisition microscopic structure are the sorbitic low-alloy super-strength cast steel of high tempering.Because it integrates mechanical property Can be superior, casting and forming is easy, and production process is few, and it is at low cost, superhigh intensity forged steel product can be replaced, in aerospace, rail It is used widely in the essential industries such as road traffic, national defence field.
It is heated using intermediate frequency furnace, speed is fast, high production efficiency, the de- charcoal of oxidation is few, saves material and cost, prolongs Long die life, and intermediate frequency furnace homogeneous heating, the core table temperature difference is minimum, and accuracy of temperature control is high, and working environment is superior, realizes low Pollution, low power consuming meet the green production of country's proposition, are that enterprise is current to improve worker laboring environment and corporate image The trend of development.
Specific embodiment
Embodiment 1
The low-alloy super-strength steel casting manufacture of the present embodiment includes the following steps:
Include the raw material of following mass percent using low-alloy high-strength toughness cast steel adding prepared by intermediate frequency furnace: carbon 0.20%, Manganese 0.70%, silicon 0.45%, chromium 0.65%, nickel 0.65%, molybdenum 0.50%, niobium 0.015%, vanadium 0.05%, sulphur≤0.01%, phosphorus≤0.01%, Surplus is iron and inevitable impurity.
With the intermediate frequency furnace melting of 150kg basic lining, each furnace melting 125kg.
Fusion process: it A, opens mid-frequency melting furnace and is debugged, the high purity iron that 125kg is added is melted；To high-purity After iron dissolved clarification, appropriate fluorite is added and removes the gred 3 times.
B, after slagging-off finishes, proportioned carburant is added into molten iron and carries out carburetting, in the process dyke carburetting The unexpected burning of agent, in order to avoid people and equipment are damaged.
C, boost source voltage heats up to mid-frequency melting furnace, then sequentially adds nickel plate, chromic carbide iron, molybdenum-iron, medium carbon manganese Iron, ferrosilicon are added interval about 30s, fine copper, ferro-niobium, vanadium iron are sequentially added after two minutes, appropriate firefly is added after standing two minutes Stone is removed the gred again；Slagging-off 5 times removes the gred 1650 DEG C of temperature.
D, after slagging-off finishes, 1700 DEG C of heat preservations is continuously heating to and stand 5 ~ 10 minutes, high temperature refinery is carried out, has refined At small test block of casting carries out the inspection of stokehold direct reading spectrometry if ingredient is qualified and is cast into keel block；If ingredient has deviation, lead to Calculating is crossed, adjusting component (recycles above-mentioned charging, slagging-off and refining process), until spectrum is shown as division lattice next time, then Casting.
E, casting process: first the molten steel that melting is completed is poured into the small ladle of 50kg, is then poured into using Dumpage type In resin sand sand mold, 1630 DEG C of tapping temperature, 1580 DEG C of cast temperature (comes out of the stove to casting process and cools down 40 ~ 50 DEG C), a furnace Entire casting process 2 minutes.
F, the casting of moulding by casting need to carry out finished product heat treatment, including normalizing temperature is 30 to 50 DEG C more than Ac3 temperature, real At 880 to 910 DEG C, normalizing soaking time is 60 to 90 minutes, then air-cooled for border control；Hardening heat is controlled 890 to 920 DEG C, Quenching Soaking Time is 60 to 90 minutes, then water cooling；At 550 to 600 DEG C, tempering insulation time is for tempering temperature control It is 90 to 120 minutes, then air-cooled.
Service check is carried out to the low-alloy super-strength cast steel being prepared, microscopic structure is high tempering Soxhlet Body, tensile strength 1450MPa, yield strength 1125MPa；Elongation 12%, room temperature v-notch Charpy pendulu impact experiment rush Hit function Ak46J, Brinell hardness 429HBW.
Embodiment 2
The low-alloy super-strength steel casting manufacture of the present embodiment includes the following steps:
Include the raw material of following mass percent using low-alloy high-strength toughness cast steel adding prepared by intermediate frequency furnace: carbon 0.26%, Manganese 0.60%, silicon 0.60%, chromium 0.65%, nickel 0.45%, molybdenum 0.70%, niobium 0.10%, vanadium 0.04%, sulphur≤0.01%, phosphorus≤0.01%, Surplus is iron and inevitable impurity.
With the intermediate frequency furnace melting of 150kg basic lining, each furnace melting 125kg.
Fusion process: it A, opens mid-frequency melting furnace and is debugged, the high purity iron that 125kg is added is melted；To high-purity After iron dissolved clarification, appropriate fluorite is added and removes the gred 2 times.
B, after slagging-off finishes, proportioned carburant is added into molten iron and carries out carburetting, in the process dyke carburetting The unexpected burning of agent, in order to avoid people and equipment are damaged.
C, boost source voltage heats up to mid-frequency melting furnace, then sequentially adds nickel plate, chromic carbide iron, molybdenum-iron, medium carbon manganese Iron, ferrosilicon are added interval about 30s, fine copper, ferro-niobium, vanadium iron are sequentially added after two minutes, appropriate firefly is added after standing two minutes Stone is removed the gred again；Slagging-off 45 times removes the gred 1640 DEG C of temperature.
D, after slagging-off finishes, 1700 DEG C of heat preservations is continuously heating to and stand 5 ~ 10 minutes, high temperature refinery is carried out, has refined At small test block of casting carries out the inspection of stokehold direct reading spectrometry if ingredient is qualified and is cast into keel block；If ingredient has deviation, lead to Calculating is crossed, adjusting component (recycles above-mentioned charging, slagging-off and refining process), until spectrum is shown as division lattice next time, then Casting.
E, casting process: first the molten steel that melting is completed is poured into the small ladle of 50kg, is then poured into using Dumpage type In resin sand sand mold, 1640 DEG C of tapping temperature, 1590 DEG C of cast temperature (comes out of the stove to casting process and cools down 40 ~ 50 DEG C), a furnace Entire casting process 2 minutes.
F, the casting of moulding by casting need to carry out finished product heat treatment, including normalizing temperature is 30 to 50 DEG C more than Ac3 temperature, real At 880 to 910 DEG C, normalizing soaking time is 60 to 90 minutes, then air-cooled for border control；Hardening heat is controlled 890 to 920 DEG C, Quenching Soaking Time is 60 to 90 minutes, then water cooling；At 550 to 600 DEG C, tempering insulation time is for tempering temperature control It is 90 to 120 minutes, then air-cooled.
Service check is carried out to the low-alloy super-strength cast steel being prepared, microscopic structure is high tempering Soxhlet Body, tensile strength 1430MPa, yield strength 1165MPa；Elongation 12%, room temperature v-notch Charpy pendulu impact experiment rush Hit function Ak42J, Brinell hardness 428HBW.
The present invention provides a kind of method for preparing low-alloy super-strength cast steel using intermediate frequency furnace, selects low-sulfur phosphorus furnace Material smelts molten steel, quiescence in high temperature refining using intermediate frequency furnace, and normalizing, the finished product heat treatment of quenching+high tempering are final to make Standby low-alloy super-strength cast steel out.This method process is few, high-efficient, the low-alloy super-strength steel intensity height of preparation, plasticity And good toughness, and hardness with higher, comprehensive performance are superior.It can be used for requiring to use under high toughness wear resistant working condition Workpiece, and alloying element is few, advantage of lower cost, is the development trend of current enterprise's melting superhigh intensity steel and iron parts.
Obviously, the above embodiment is merely an example for clearly illustrating the present invention, and is not to of the invention The restriction of embodiment.For those of ordinary skill in the art, it can also be made on the basis of the above description Its various forms of variation or variation.There is no necessity and possibility to exhaust all the enbodiments.And these belong to this hair The obvious changes or variations that bright spirit is extended out are still in protection scope of the present invention.

Claims (3)

1. a kind of production method of the casting of low-alloy super-strength steel, the chemical component and its matter of the low-alloy super-strength steel Measuring percentage includes:
C:0.20% ~ 0.30%；
Si:0.50% ~ 0.70%；
Mn:0.60% ~ 0.80%；
Cr:0.60% ~ 1.10%；
Ni:0.40% ~ 0.65%；
Mo:0.50% ~ 0.75%；
Nb:0.05% ~ 0.15%；
V:0.03% ~ 0.05%；
Ti:0.001% ~ 0.003%；
Al:0.01% ~ 0.03%；
Cu:0.02% ~ 0.05%；
P≤0.010%；
S≤0.010%；
Surplus is iron and inevitable impurity；
It is characterized by comprising the following steps:
A, it opens mid-frequency melting furnace and debugs, high-purity pig iron is added and is melted, fluorite is added after high-purity pig iron is melting down and carries out Slagging-off 2 times to 3 times；
B, after the completion of slagging-off, proportioned carburant is added into molten iron and carries out carburetting；
C, boost source voltage heats up to mid-frequency melting furnace, be first added according to predetermined ratio nickel plate, chromic carbide iron, molybdenum-iron, Mid-carbon fe-mn, ferrosilicon add fine copper, ferro-niobium, vanadium iron and stand, and add fluorite and carry out slagging-off 3-5 times, slagging-off temperature control At 1650 DEG C ± 10 DEG C；
D, it is continuously heating to 1700 DEG C after the completion of slagging-off and keeps the temperature standing refining, sampling carries out stokehold spectral test, according to spectrum Inspection result adjusts molten steel component, so that the alloy element component in molten steel satisfaction meets C:0.20% ~ 0.30%；Si:0.50% ~ 0.70%；Mn:0.60% ~ 0.80%；Cr:0.60% ~ 1.10%；Ni:0.40% ~ 0.65%；Mo:0.50% ~ 0.75%；Nb:0.05% ~ 0.15%；V:0.03% ~ 0.05%；Ti:0.001% ~ 0.003%；Al:0.01% ~ 0.03%；Cu:0.02% ~ 0.05%；P≤0.010%； The requirement of S≤0.010%；
E, it adjusts to after meeting mentioned component demand, the tapping temperature of molten steel is controlled at 1610-1650 DEG C, by melted steel Liquid is all come out of the stove to ladle, and thermometric makes temperature control at 1560~1580 DEG C, then carries out bottom pour ladle casting；
F, the casting of moulding by casting need to carry out finished product heat treatment, be heat-treated as normalizing, quenching+high tempering, to obtain high temperature Tempered sorbite tissue.
2. the production method of casting according to claim 1, which is characterized in that in the step F, heat treatment process are as follows: Normalizing temperature 50 DEG C, i.e., 880 to 910 DEG C more than Ac3 temperature；At 880 to 920 DEG C, tempering temperature is controlled for hardening heat control At 550 to 650 DEG C.
3. the production method of casting according to claim 2, which is characterized in that in the step E, using resin sand sand mold Carry out bottom pour ladle casting.
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Denomination of invention: A production method for low alloy ultra-high strength steel and its castings

Granted publication date: 20190301

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