CN108220750A - A kind of production method of the bright as silver bars of high carbon martensite Valve Steel 85Cr18Mo2V - Google Patents

A kind of production method of the bright as silver bars of high carbon martensite Valve Steel 85Cr18Mo2V Download PDF

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Publication number
CN108220750A
CN108220750A CN201810036141.7A CN201810036141A CN108220750A CN 108220750 A CN108220750 A CN 108220750A CN 201810036141 A CN201810036141 A CN 201810036141A CN 108220750 A CN108220750 A CN 108220750A
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85cr18mo2v
steel
temperature
continuous casting
electroslag
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Inventor
张国付
涂玉国
艾进
翟德建
柯红升
翟健红
魏伟
薛卫兵
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Jiangsu Shenyuan Special Steel Co Ltd
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Jiangsu Shenyuan Special Steel 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
    • 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
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C22B9/18—Electroslag remelting
    • 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
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The present invention proposes a kind of production method of the bright as silver bar of high carbon martensite Valve Steel 85Cr18Mo2V, includes the following steps：The alloy materials such as steel scrap and high carbon ferro-chrome are incorporated in electric arc furnaces, the fusing for carrying out alloy is just refined；Ladle refining furnace is smelted；VD stove vacuum refinings；Arc billet caster continuous casting；Electroslag remelting；High speed wire rolling；Annealing；Storage is examined in aligning and polishing.The production method of the bright as silver bars of Valve Steel 85Cr18Mo2V of the present invention overcomes the problem that 85Cr18Mo2V high temperature hot deformation resistances are difficult to greatly continuous casting using the metallurgical technology means of continuous casting base material and electroslag remelting production steel billet；Primary carbide form and distribution situation are improved, and reduces the metallurgical imperfections such as the various segregations in blank, loose, the effective tissue for refining original blank；Energy digestion is greatlyd save, reduces production cost；Electroslag ingot one-heating forming is taken, significantly improves production efficiency；Wire rod achievees the purpose that cost efficiency using the problems such as grinding processing, not generating the pollution of pickle.

Description

A kind of production method of the bright as silver bars of high carbon martensite Valve Steel 85Cr18Mo2V
Technical field
The present invention relates to high-carbon geneva Diesel Engine's Air Valve steel and its manufacturing method more particularly to a kind of high carbon martensite gas The production method of the bright as silver bar of valve steel 85Cr18Mo2V.
Background technology
Valve Steel 85Cr18Mo2V is martensite in national standard GB/T12773-2008 Diesel Engine's Air Valves steel and alloy bar material One kind in Valve Steel contains following component with weight percentage：C：0.80~0.90%；Si：≤1.00%；Mn：≤1.50%； P：≤0.040%；S≤0.030%；Cr：16.50~18.50%；Mo：2.00~2.50%；V：0.30~0.60%；Cu：≤ 0.30%；Surplus is Fe and inevitable impurity element.Main application is in the air inlet of manufacture heavy type or high load capacity diesel locomotive Valve, high carbon martensite Valve Steel 85Cr18Mo2V is in 80Cr20Si2Ni（U.S. grade of steel XB, Japanese grade of steel SUH4）On the basis of send out Exhibition.80Cr20Si2Ni is in American-European countries in middle fifties development and application, in order to improve air valve material Corrosion resistance, wearability, but found in Special Steel Works actual production, 80Cr20Si2Ni steel grade plasticity is poor, and lumber recovery is low, is making Air valve stem end hardening hardness cannot be guaranteed >=50HRC in valve factory, and yield rate is low, of high cost, is slowly eliminated, in ISO683-13 It has been cancelled in standard and some other national standards, has been substituted by German grade of steel X85CrMoV182, which overcomes Big some shortcomings of grade of difficulty of processing of 80Cr20Si2Ni.Formally will in China Valve Steel standard GB/T12773-2008 in 2008 85Cr18Mo2V included (German grade of steel X85CrMoV182).
High carbon martensite Valve Steel 85Cr18Mo2V is generally delivered goods with the bright as silver bar state after annealing, and specification is φ 5- Since it contains higher carbon content and chromium content, easily there is more carbide in the bar of 15mm in annealed structure, conventional Electric furnace add the high carbon martensite steel that the method for external refining produces, cast when choosing point crystallization due to, primary carbide Bigger than normal, the Cold Roll rank after rolling is higher, and distribution of carbides is uneven, also contains twin carbide sometimes, these The phenomenon that carbide is uneven not only reduces the plasticity of steel, has an effect on the fatigue at high temperature performance indicator of product.In addition, gren rod Aligning process in, due to the characteristics of material hardness is high, brittleness is strong, it is existing often to occur fracture in uncoiling and straightening process As taking the direct high speed wire rolling large coil wire production technique of steel ingot that molding is poured into a mould more difficult.
Have in existing patented technology and documents and materials for the ameliorative way of high carbon martensite steel grade carbide more Explanation, as pointed out in patent ZL201410348136.1 regulation and control ingredient and control heat treatment process improve carbide morphology and point Cloth feature, however this method is only for 9Cr18 stainless steel forgings products, for high-speed rod product this method of bigger compression ratio Feasibility needs to be investigated.A kind of production method of martensite air valve steel bar is indicated in patent 201010153186.6, In be not directed to the manufacturing process of wire rod, mainly by carrying out drawing aligning to wire rod, repolish the geneva polished Body bar, this method have used the processes such as alkali cleaning and sulfuric acid washing, mixing pickling, epithelium film and lubricant in drawing process Come being surface-treated to martensite air valve steel wire rod, though qualified bar, alkali cleaning, pickling, film agent, profit can be obtained The industrial chemicals such as lubrication prescription can generate the more pollutant effulent containing chromium, and in environmental requirement increasingly strict today, the technique is non- It is often undesirable, and light draw in the process can aggravate processing hardening phenomenon with Two-roll straightening to 85Cr18Mo2V wire rods so that material More " crisp " and easily " disconnected ", lumber recovery is influenced.The preparation section of 85Cr18Mo2V blanks is illustrated in the embodiment 1 of the patent For：Electric arc+ladle refining → hammer cogging → forging stock annealing → Pan Yuan rollings → Pan Yuan annealings, from the technological process The technique that can be seen that hammer cogging and disk circle rolling needs " two igneous materials ", and the annealing containing forging stock, steel billet and forging stock Heating for multiple times will seriously restrict the production efficiency and cost of 85Cr18Mo2V wire rods.
Invention content
To solve the characteristics of existing high carbon martensite Valve Steel 85Cr18Mo2V is difficult to produce and process, the present invention provides A kind of production method of the bright as silver bar of high carbon martensite Valve Steel 85Cr18Mo2V, takes electric furnace → external refining → continuous casting Mode produces 85Cr18Mo2V electroslag base materials, then is equipped with electric slag refusion and smelting means and changes crystalline structure so as to hot to improve material Processing performance.The molten metal that electroslag base material is formed in esr process is to drop in metal bath dropwise, is led in crystallizer There is cooling circulating water, the cooling velocity of steel ingot is very fast, and the primary carbide of formation is because of condensation, and particle is tiny and disperse divides Cloth, this kind of crystallization mode effectively improve carbide morphology size and distribution situation, and the dense structure of produced steel ingot, Even, field trash is few, conducive to thermo forming.
Specifically, to achieve the object of the present invention, the silver of high carbon martensite Valve Steel 85Cr18Mo2V of the invention a kind of The production method of bright bar, includes the following steps：
Step 1：The alloy materials such as steel scrap and high carbon ferro-chrome are incorporated in electric arc furnaces, the fusing for carrying out alloy is just refined；Wherein, EBT goes out Steel temperature >=1600 DEG C, P≤0.040%；
Step 2：Ladle refining furnace is smelted：Adjust alloying component, heating refining, deoxidation；Sampling analysis, when each alloying component After reaching national standard, white slag retention time >=10 minute, during temperature >=1600 DEG C, tapping goes to VD stations；
Step 3：VD stove vacuum refinings：It first removes the gred, vacuumizes into VD stokeholds, retention time >=12 when vacuum degree reaches 67Pa Minute；After vacuum breaker, thermometric, sampling analysis, and coverture is added in, and holding soft argon blowing, calm time >=10 minute, temperature >= At 1500 DEG C, continuous casting machine platform is gone to；
Step 4：Arc billet caster continuous casting：Using crystallizer and the combination of end electromagnetic agitation during cast；Pulling rate control It is made as：Target temperature is 1450-1470 DEG C, target pull rate 1.0-1.2m/min；It cools down control mode and uses three for two cold-zones The mode of segmentation subregion water distribution, specific water is with pulling rate Auto-matching；Length-fixing cutting during ejection, air-cooled stacking obtain continuous casting electricity Slag base material blank；
Step 5：Electroslag remelting：The electroslag base material blank of continuous casting and dummy electrode are welded, carry out electroslag remelting, remelting electricity 5000-6000A, voltage 50-55V are flowed, 120-160 minutes remelting time is controlled, obtains electroslag ingot；After electroslag ingot demoulding, Enter sandpit slow cooling in 15 minutes, steel ingot, which is taken, buries sand slow cooling, can go out hole, transition rolling after keeping ingot slow cool to room temperature；
Step 6：High speed wire rolling：Heating cycle is to be heated in pusher-type furnace or walking beam furnace, bloom adds Hot temperature presses control claimed below：Preheating section：≤920℃；Bringing-up section：920~1020 DEG C, soaking zone：1130~1150 DEG C；It opens Roll temperature：1120~1140 DEG C, finish to gauge laying temperature controls >=900 DEG C, and finishing speeds are controlled in 28~35m/s, air-cooled entrance Collection spiral is collected, and is transferred to heat treatment procedure, gren rod out-of-roundness control ± 0.15mm；
Step 7：Annealing：Gren rod was made annealing treatment in 6 hours, and annealing is using bogie hearth electric resistance furnace, heating cycle： It heats up with stove, room temperature is to 850 DEG C, heating-up time >=4 hour；4~4.5 hours are kept the temperature when reaching 850 ± 10 DEG C, is cooled to the furnace It is air-cooled after less than 600 DEG C；
Step 8：Aligning：85Cr18Mo2V wire rods immerse retention tab in lime coating solution after annealing heat-treats, by wire rod It carves, pulls out, spontaneously dry, face coat of being subject to is dry, whitens；Wire rod is aligned using seven roller straighteners；
Step 9：Storage is examined in polishing：Black vertical bar after aligning carries out grinding processing, is polished using centerless grinding machine, is divided into corase grinding + fine grinding, grinded bar carry out NDT non-destructive testings, after the assay was approved product warehousing.
Preferably, in the step two, the deoxidier that ladle refining deoxidation uses is ferrosilicon or silico-calcium, and dosage is to protect It holds subject to white slag operation.
Further preferably, in the step five kind, the slag charge of electroslag remelting chooses pre-melted slag CaF2 by mass percentage： Al2O3=70%：30% pseudo-ginseng slag.
Compared with conventional production high carbon martensite Valve Steel, the life of the bright as silver bars of Valve Steel 85Cr18Mo2V of the invention Production method is overcome 85Cr18Mo2V high temperature deformations and is resisted using the metallurgical technology means of continuous casting base material and electroslag remelting production steel billet Power is difficult to greatly the problem of continuous casting；Primary carbide form and distribution situation are improved, and reduces the various segregations in blank, dredge The metallurgical imperfections such as pine, the effective tissue for refining original blank；Energy digestion is greatlyd save, reduces production cost；Take electricity Slag steel ingot one-heating forming, significantly improves production efficiency；Wire rod uses the problems such as grinding processing, not generating the pollution of pickle, Achieve the purpose that cost efficiency.
Description of the drawings
Through the following detailed description taken in conjunction with the accompanying drawings, the present invention is aforementioned will become with other objects, features and advantages Obviously.Wherein：
Fig. 1 show the bright as silver bar 500X metallographic structure photos of 85Cr18Mo2V products of embodiment production according to the present invention Diagram.
Specific embodiment
The technological process that uses of the bright as silver bars of high carbon martensite Valve Steel 85Cr18Mo2V of the present invention and route for：Electric furnace → external refining → continuous casting → electroslag remelting → high speed wire rolling → wire rod annealing → aligning → polishing → inspection → storage, including The smeltings of 85Cr18Mo2V gren rods, continuous casting, electroslag, high speed wire rolling production process, the also aligning including wire rod, mill Light examines production and processing process.Specifically, the production method includes the following steps：
Step 1：The alloy materials such as steel scrap and high carbon ferro-chrome are incorporated in electric arc furnaces, the fusing for carrying out alloy is just refined；Wherein, EBT goes out Steel temperature >=1600 DEG C, P≤0.040%；
Step 2：Ladle refining furnace（LF stoves）It smelts：Alloying component is adjusted, the deoxidiers such as ferrosilicon and silico-calcium are taken in heating refining Deoxidation is carried out, dosage, which is subject to, keeps white slag to operate；Sampling analysis, after each alloying component reaches national standard, white slag is protected It holds the time >=10 minutes, during temperature >=1600 DEG C, tapping goes to VD stations；
Step 3：VD stove vacuum refinings：It first removes the gred, vacuumizes into VD stokeholds, vacuum degree reaches 67Pa retention time >=12 point Clock；After vacuum breaker, thermometric, sampling analysis, and coverture is added in, and holding soft argon blowing, calm time >=10 minute, temperature >= At 1500 DEG C, continuous casting machine platform is gone to；
Step 4：Arc billet caster continuous casting：Using crystallizer and the combination of end electromagnetic agitation during cast；Pulling rate control It is made as：1450-1470 DEG C of target temperature, target pull rate 1.0-1.2m/min；It cools down control mode and uses three sections for two cold-zones The mode of formula subregion water distribution, specific water is with pulling rate Auto-matching；Length-fixing cutting during ejection, air-cooled stacking obtain the nominal length of side For：150×150mm（Tolerance meets YB/T2011-2004 tables 1 and is required with table 2）, length is the continuous casting of 3200-3500mm Electroslag base material blank；
Step 5：Electroslag remelting：The electroslag base material blank of continuous casting and dummy electrode are welded, carry out electroslag remelting, slag charge choosing Take pre-melted slag or pseudo-ginseng slag（I.e. by mass percentage CaF2：Al2O3=70%：30%）, normal melting current 5000-6000A, electricity 50-55V is pressed, controls 120-160 minutes remelting time, obtains weight as 530 ± 20Kg electroslag ingots；After electroslag ingot demoulding, Sandpit slow cooling is had to enter into 15 minutes, steel ingot, which is taken, buries sand slow cooling, can go out hole after keeping ingot slow cool to room temperature, transition is rolled System；
Step 6：High speed wire rolling：Heating cycle is to be heated in pusher-type furnace or walking beam furnace, bloom adds Hot temperature presses control claimed below：Preheating section：≤920℃；Bringing-up section：920~1020 DEG C, soaking zone：1130~1150 DEG C；It opens Roll temperature：1120~1140 DEG C, finish to gauge laying temperature controls >=900 DEG C, and finishing speeds are controlled in 28~35m/s, air-cooled entrance Collection spiral is collected, and is transferred to heat treatment procedure, gren rod out-of-roundness control ± 0.15mm；
Step 7：Annealing：Gren rod need to be made annealing treatment in 6 hours, and annealing is using bogie hearth electric resistance furnace, heating cycle For：It heats up with stove, room temperature is to 850 DEG C, and heating-up time >=4 hour, 850 ± 10 DEG C keep the temperature 4~4.5 hours, cool to 600 with the furnace It is air-cooled after below DEG C；
Step 8：Aligning：85Cr18Mo2V wire rods immerse retention tab in lime coating solution after annealing heat-treats, by wire rod It carves, pulls out, spontaneously dry, face coat of being subject to is dry, whitens；Wire rod is aligned using seven roller straighteners, and straightness≤ 1mm/m。
Step 9：Storage is examined in polishing.Black vertical bar after aligning carries out grinding processing, is polished, is divided into using centerless grinding machine Corase grinding+fine grinding, institute's processing bar diameter and surface quality requirements are controlled by the requirement of national standard or client, grinded bar Carry out NDT non-destructive testings（Ultrasonic wave and vortex）, product warehousing after the assay was approved.
Embodiment 1
It produces the 85Cr18Mo2V that product specification is φ 12mm and polishes bright as silver bar, chemical composition is shown in Table 1.
85Cr18Mo2V bar chemical compositions in 1 embodiment 1 of table
Element C Si Mn P S Cr Mo V Cu
Content/% 0.83 0.40 1.20 0.030 0.003 17.50 2.15 0.40 0.10
Production technology is as follows：
The first step：The alloy materials such as steel scrap and high carbon ferro-chrome are incorporated in electric arc furnaces, the fusing for carrying out alloy is just refined；EBT tapping temperature >=1610 DEG C of degree, P≤0.040%；
Second step：LF stoves are smelted：Alloying component is adjusted, heating refining takes the deoxidiers such as ferrosilicon and silico-calcium to carry out deoxidation, dosage It is subject to and white slag is kept to operate, sampling analysis, after each alloying component reaches national standard, 15 minutes white slag retention times, When temperature is 1610 DEG C, tapping goes to VD stations；
Third walks：VD stoves, into VD before need to remove the gred, vacuumize, vacuum degree reaches the 67Pa retention times 15 minutes；After vacuum breaker, Thermometric, sampling complete analysis, and add in coverture, keep calm soft argon blowing 12 minutes, during thermometric T=1520, go to conticaster and put down Platform；
4th step：Arc billet caster continuous casting：Using crystallizer and the combination of end electromagnetic agitation during cast, wherein, Casting speed control：1450-1470 DEG C of target temperature, target pull rate 1.0-1.2m/min；Cooling control：Two cold-zones are using three-stage point The mode of area's water distribution, specific water is with pulling rate Auto-matching；Length-fixing cutting during ejection, air-cooled stacking, obtain section for 150 × 150mm, length are the continuous casting electroslag base material blank of 3250mm；
5th step：Electroslag remelting：The electroslag base material blank of continuous casting and dummy electrode are welded, carry out electroslag remelting, slag charge choosing Take pseudo-ginseng slag（CaF2：Al2O3=70%：30%）, normal melting current 5300A, voltage 53V, 140 minutes remelting time, obtain weight It measures as 530Kg electroslag ingots；After electroslag ingot demoulding, sandpit slow cooling is had to enter into 12 minutes, buries sand slow cooling to room temperature rear Hole, transition rolling can be gone out；
6th step：High speed wire rolling, heating cycle are to be heated in pusher-type furnace or walking beam furnace, bloom adds Hot temperature presses control claimed below：Preheating section：≤920℃；Bringing-up section：920~1020 DEG C, soaking zone：1130~1150 DEG C；It opens Roll temperature：1125 DEG C, finish to gauge laying temperature controls >=950 DEG C, and finishing speeds control is in 33m/s, rolling specs 12.5mm, sky It is cold to be collected into P＆F collection spirals, it is transferred to heat treatment procedure, gren rod out-of-roundness control ± 0.15mm；
7th step：Annealing：Gren rod need to be made annealing treatment in 6 hours, and annealing is using bogie hearth electric resistance furnace, heating cycle For：It heats up with stove, room temperature to 850 DEG C of need ensures that the heating-up time is 5 hours, and 850 ± 10 DEG C keep the temperature 4 hours, cool to 600 with the furnace It is air-cooled after below DEG C；
8th step：Aligning：85Cr18Mo2V wire rods immerse retention tab in lime coating solution after annealing heat-treats, by wire rod It carves, pulls out, spontaneously dry, face coat of being subject to is dry, whitens；Wire rod is aligned using seven roller straighteners, and straightness≤ 1mm/m；
9th step：Polish, examine into.Black vertical bar after aligning carries out grinding processing, is polished using M1030 centerless grinding machines, 2 is thick Grind the fine grinding of+1 road, grinded progress NDT non-destructive testings（Ultrasonic wave and vortex）, 12.0 bright as silver bar is obtained, it is qualified to examine After be put in storage.
Test in laboratory 85Cr18Mo2V distribution of carbides, as shown in Figure 1：
Choose different, test heat treatment in laboratory（With reference to table 4 in national standard GB/T12773-2008）Mechanical performance index afterwards is such as Under：
Compared with conventional production high carbon martensite Valve Steel, the producer of the bright as silver bars of Valve Steel 85Cr18Mo2V of the invention Method has the advantages that the following：
（1）Steel billet is produced using the metallurgical technology means of continuous casting base material and electroslag remelting, overcomes 85Cr18Mo2V high temperature deformations Drag is difficult to greatly the problem of continuous casting, and external refining and continuous casting metallurgy mode ensure that the degree of purity of electroslag base material, and electroslag crystallization is strong Refrigeration but the characteristics of, not only improve primary carbide form and distribution situation, and reduce various segregations in blank, loose Metallurgical imperfections are waited, the effective tissue for refining original blank not only improves hot-working character, and improve the product of product Matter particularly improves high temperature（500-800℃）The mechanical behavior under high temperature of the air valve used；
（2）Electroslag ingot takes the mode for burying sand slow cooling, cooled to room temperature, does not need to move back steel ingot in whole flow process Fire processing greatlys save energy digestion, reduces production cost；
（3）The production technology of electroslag ingot one-heating forming is taken, direct high speed wire rolling obtains the higher air valve steel disk of dimensional accuracy Item without carrying out the processes such as multiple cogging and heating, significantly improves production efficiency；
（4）After the wire rod for taking dimensional accuracy high directly aligning, then grind the production technology of processing, eliminate high-carbon geneva The processes such as the pickled surface processing and drawing of body disc item, the problems such as reducing production process, and do not generate the pollution of pickle, reach To the purpose of cost efficiency.
The present invention is not limited to the described embodiments, and those skilled in the art is i.e. public in the spirit for not departing from the present invention It in the range of opening, still may make some modifications or changes, therefore the scope of the present invention is limited ranging from claims It is accurate.

Claims (3)

  1. A kind of 1. production method of the bright as silver bar of high carbon martensite Valve Steel 85Cr18Mo2V, which is characterized in that the life Production method includes the following steps：
    Step 1：The alloy materials such as steel scrap and high carbon ferro-chrome are incorporated in electric arc furnaces, the fusing for carrying out alloy is just refined；Wherein, EBT goes out Steel temperature >=1600 DEG C, P≤0.040%；
    Step 2：Ladle refining furnace is smelted：Adjust alloying component, heating refining, deoxidation；Sampling analysis, when each alloying component After reaching national standard, white slag retention time >=10 minute, during temperature >=1600 DEG C, tapping goes to VD stations；
    Step 3：VD stove vacuum refinings：It first removes the gred, vacuumizes into VD stokeholds, retention time >=12 when vacuum degree reaches 67Pa Minute；After vacuum breaker, thermometric, sampling analysis, and coverture is added in, and holding soft argon blowing, calm time >=10 minute, temperature >= At 1500 DEG C, continuous casting machine platform is gone to；
    Step 4：Arc billet caster continuous casting：Using crystallizer and the combination of end electromagnetic agitation during cast；Pulling rate control It is made as：Target temperature is 1450-1470 DEG C, target pull rate 1.0-1.2m/min；It cools down control mode and uses three for two cold-zones The mode of segmentation subregion water distribution, specific water is with pulling rate Auto-matching；Length-fixing cutting during ejection, air-cooled stacking obtain continuous casting electricity Slag base material blank；
    Step 5：Electroslag remelting：The electroslag base material blank of continuous casting and dummy electrode are welded, carry out electroslag remelting, remelting electricity 5000-6000A, voltage 50-55V are flowed, 120-160 minutes remelting time is controlled, obtains electroslag ingot；After electroslag ingot demoulding, Enter sandpit slow cooling in 15 minutes, steel ingot, which is taken, buries sand slow cooling, can go out hole, transition rolling after keeping ingot slow cool to room temperature；
    Step 6：High speed wire rolling：Heating cycle is to be heated in pusher-type furnace or walking beam furnace, bloom adds Hot temperature presses control claimed below：Preheating section：≤920℃；Bringing-up section：920~1020 DEG C, soaking zone：1130~1150 DEG C；It opens Roll temperature：1120~1140 DEG C, finish to gauge laying temperature controls >=900 DEG C, and finishing speeds are controlled in 28~35m/s, air-cooled entrance Collection spiral is collected, and is transferred to heat treatment procedure, gren rod out-of-roundness control ± 0.15mm；
    Step 7：Annealing：Gren rod was made annealing treatment in 6 hours, and annealing is using bogie hearth electric resistance furnace, heating cycle： It heats up with stove, room temperature is to 850 DEG C, heating-up time >=4 hour；4~4.5 hours are kept the temperature when reaching 850 ± 10 DEG C, is cooled to the furnace It is air-cooled after less than 600 DEG C；
    Step 8：Aligning：85Cr18Mo2V wire rods immerse retention tab in lime coating solution after annealing heat-treats, by wire rod It carves, pulls out, spontaneously dry, face coat of being subject to is dry, whitens；Wire rod is aligned using seven roller straighteners；And
    Step 9：Storage is examined in polishing：Black vertical bar after aligning carries out grinding processing, is polished using centerless grinding machine, is divided into corase grinding + fine grinding, grinded bar carry out NDT non-destructive testings, after the assay was approved product warehousing.
  2. 2. a kind of production method of the bright as silver bar of high carbon martensite Valve Steel 85Cr18Mo2V as described in claim 1, It is characterized in that, in the step two, the deoxidier that ladle refining deoxidation uses is ferrosilicon or silico-calcium, and dosage is to keep white slag Subject to operation.
  3. 3. a kind of production method of the bright as silver bar of high carbon martensite Valve Steel 85Cr18Mo2V as described in claim 1, It is characterized in that, in the step five kind, the slag charge of electroslag remelting chooses pre-melted slag CaF2 by mass percentage：Al2O3=70%： 30% pseudo-ginseng slag.
CN201810036141.7A 2018-01-15 2018-01-15 A kind of production method of the bright as silver bars of high carbon martensite Valve Steel 85Cr18Mo2V Pending CN108220750A (en)

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CN109530429A (en) * 2018-11-14 2019-03-29 宝钢特钢韶关有限公司 A kind of rolling mill practice of steady production martensite air-valve steel rolling base
CN110373599A (en) * 2019-06-28 2019-10-25 浙江精瑞工模具有限公司 A kind of method of refining of high-toughness alloy steel
CN111534662A (en) * 2020-06-12 2020-08-14 河北鑫泰轴承锻造有限公司 DHRE round steel production process
CN112609132A (en) * 2020-11-18 2021-04-06 江苏申源集团有限公司 Production and preparation method of iron-chromium-aluminum electrothermal alloy wire rod
CN113088630A (en) * 2021-03-11 2021-07-09 上大新材料(泰州)研究院有限公司 Method for modifying martensite air valve steel carbide
CN113234909A (en) * 2021-05-13 2021-08-10 江苏申源集团有限公司 Preparation process of EMS1 martensite air valve steel large-specification bar for hot extrusion
CN113245393A (en) * 2021-05-08 2021-08-13 江苏申源集团有限公司 Preparation method of bar for EMS247 austenitic gas valve steel hot extrusion
CN113996772A (en) * 2021-11-04 2022-02-01 攀钢集团江油长城特殊钢有限公司 Preparation method of 95Cr18
CN115287544A (en) * 2022-08-24 2022-11-04 浙江青山钢铁有限公司 Soft magnetic stainless steel wire rod with excellent welding performance and manufacturing method thereof
CN115537671A (en) * 2021-06-30 2022-12-30 宝山钢铁股份有限公司 Preparation method of valve spring steel
CN115896609A (en) * 2022-07-06 2023-04-04 钢铁研究总院有限公司 High-strength high-plasticity air valve steel and preparation method thereof
EP4092152A4 (en) * 2020-12-31 2023-08-23 Daye Special Steel Co., Ltd. Steel for wind power gear with improved purity and reliability, and smelting method therefor

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CN106269869A (en) * 2016-08-25 2017-01-04 江苏申源特钢有限公司 A kind of production method of Valve Steel 53Cr21Mn9Ni4N polishing bar
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CN103397276A (en) * 2013-08-12 2013-11-20 钢铁研究总院 High-strength nickel-saving air valve steel and preparation method thereof
CN105603330A (en) * 2016-01-19 2016-05-25 重庆材料研究院有限公司 Fine-grain anti-fatigue gas valve steel wire rod and manufacture method thereof
CN106269869A (en) * 2016-08-25 2017-01-04 江苏申源特钢有限公司 A kind of production method of Valve Steel 53Cr21Mn9Ni4N polishing bar
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Cited By (18)

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Publication number Priority date Publication date Assignee Title
CN109530429A (en) * 2018-11-14 2019-03-29 宝钢特钢韶关有限公司 A kind of rolling mill practice of steady production martensite air-valve steel rolling base
CN110373599A (en) * 2019-06-28 2019-10-25 浙江精瑞工模具有限公司 A kind of method of refining of high-toughness alloy steel
CN110373599B (en) * 2019-06-28 2021-05-14 浙江精瑞工模具有限公司 Refining method of high-toughness alloy steel
CN111534662A (en) * 2020-06-12 2020-08-14 河北鑫泰轴承锻造有限公司 DHRE round steel production process
CN112609132A (en) * 2020-11-18 2021-04-06 江苏申源集团有限公司 Production and preparation method of iron-chromium-aluminum electrothermal alloy wire rod
EP4092152A4 (en) * 2020-12-31 2023-08-23 Daye Special Steel Co., Ltd. Steel for wind power gear with improved purity and reliability, and smelting method therefor
CN113088630B (en) * 2021-03-11 2022-06-21 上大新材料(泰州)研究院有限公司 Method for modifying martensite air valve steel carbide
CN113088630A (en) * 2021-03-11 2021-07-09 上大新材料(泰州)研究院有限公司 Method for modifying martensite air valve steel carbide
CN113245393A (en) * 2021-05-08 2021-08-13 江苏申源集团有限公司 Preparation method of bar for EMS247 austenitic gas valve steel hot extrusion
CN113234909A (en) * 2021-05-13 2021-08-10 江苏申源集团有限公司 Preparation process of EMS1 martensite air valve steel large-specification bar for hot extrusion
CN113234909B (en) * 2021-05-13 2024-04-02 江苏申源集团有限公司 Preparation process of bar for large-scale hot extrusion of EMS1 martensitic gas valve steel
CN115537671A (en) * 2021-06-30 2022-12-30 宝山钢铁股份有限公司 Preparation method of valve spring steel
CN115537671B (en) * 2021-06-30 2023-09-12 宝山钢铁股份有限公司 Preparation method of valve spring steel
CN113996772A (en) * 2021-11-04 2022-02-01 攀钢集团江油长城特殊钢有限公司 Preparation method of 95Cr18
CN115896609A (en) * 2022-07-06 2023-04-04 钢铁研究总院有限公司 High-strength high-plasticity air valve steel and preparation method thereof
CN115896609B (en) * 2022-07-06 2024-04-05 钢铁研究总院有限公司 High-strength high-plasticity air valve steel and preparation method thereof
CN115287544B (en) * 2022-08-24 2023-10-31 浙江青山钢铁有限公司 Soft magnetic stainless steel wire rod with excellent welding performance and manufacturing method thereof
CN115287544A (en) * 2022-08-24 2022-11-04 浙江青山钢铁有限公司 Soft magnetic stainless steel wire rod with excellent welding performance and manufacturing method thereof

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Application publication date: 20180629