CN103192061B - Method for improving isometric crystal area proportion of SA508-3 low alloy steel as-cast structure - Google Patents
Method for improving isometric crystal area proportion of SA508-3 low alloy steel as-cast structure Download PDFInfo
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- CN103192061B CN103192061B CN201310101225.1A CN201310101225A CN103192061B CN 103192061 B CN103192061 B CN 103192061B CN 201310101225 A CN201310101225 A CN 201310101225A CN 103192061 B CN103192061 B CN 103192061B
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Abstract
The invention discloses a method for improving isometric crystal area proportion of an SA508-3 low alloy steel as-cast structure. The method includes the steps of alloy configuration, preheating and casting mold, alloy heating, overheating processing of alloy liquid and alloy casting so as to obtain SA-508-3 low alloy ingots with even and small structures. The method can greatly improve uniformity of the SA508-3 low alloy steel as-cast structure, increases the isometric crystal area proportion, and facilitates improvement of comprehensive mechanics performance of SA508-3 low alloy steel. The method for improving the isometric crystal area proportion of the SA508-3 low alloy steel as-cast structure is simple in process, only needs to optimize casting process parameters, can achieve effective control of the uniformity of the SA508-3 low alloy steel as-cast structure, and is easy to control and suitable for industrial production.
Description
Technical field
The present invention relates to a kind of method improving SA508-3 low-alloy steel as-cast structure proportion of equiaxed grain, belong to ingot casting casting technique field.
Background technology
SA508-3 steel, owing to having good mechanical performance and low-temperature flexibility, is therefore widely used on nuclear pressure vessel, and its chemical composition is as shown in table 1.In recent years, along with the sharply increase of electricity needs, countries in the world, while the quantity increasing nuclear power station, are also improving constantly nuclear reactor capacity, and are singly piling the increase of capacity, inevitably causing the maximization of nuclear pressure vessel; In addition from security consideration, nuclear reactor also should reduce fusion length as far as possible, and therefore the integration development of nuclear forging is inevitable.According to Structure Inheritance rule, the structure and properties of the metallic article after pressure processing largely relies on initial as-cast structure, and therefore, how producing the ingot casting with even tiny as-cast structure will become a great problem in current industrial production.
The chemical composition (wt.%) of table 1.SA508-3 low-alloy steel
At present, the method for the raising as-cast structure uniformity generally used in industrial production mainly contains two kinds: method of chemical treatment (namely breed and go bad) and Physical (namely applying mechanical oscillation, electric and magnetic oscillation, ultrasonic vibration etc.).But, fact proved, although chemical method and Physical can refinement ingot structures, all to there is certain limitation.Such as chemical method fining agent complicated process of preparation, thus cause production cost to improve, and easily polluting (especially to the alloy system that component requirements is strict) foundry alloy, Physical is too high and limited efficiency to equipment requirement.
Therefore, those skilled in the art is devoted to develop a kind of with low cost, method that technique simply improves SA508-3 low-alloy steel as-cast structure proportion of equiaxed grain.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide a kind of method that technique simply improves SA508-3 low-alloy steel as-cast structure proportion of equiaxed grain.
For achieving the above object, the invention provides a kind of method improving SA508-3 low-alloy steel as-cast structure equiax crystal district ratio, method of the present invention can crystal grain thinning, improve as-cast structure, thus improve the comprehensive mechanical property of ingot casting.
The method of raising SA508-3 low-alloy steel as-cast structure equiax crystal district of the present invention ratio, specifically comprises the steps:
1, alloy is configured
Component requirements configuration alloy raw material according to alloy: carbon dust, pure manganese, pure molybdenum, pure nickel, pure chromium, silicon, pure vanadium, pure iron are alloy raw material; Due to the easy scaling loss of the element such as Elements C, Cr, Mn in alloy, therefore these elements all carry out each configuration alloy raw material by the upper limit of the low-alloy steel component requirements shown in table 1; Preferably, C, Cr, Mn ratio is 25:25:150.
2, preheating casting mold
Adopt sand mo(u)ld be casting mold and carry out preheating to it, its preheat temperature is 600 DEG C ~ 800 DEG C;
3, heating alloys alloy liquid carries out Overheating Treatment
The inventive method adopts intermediate frequency furnace, and after alloy melting, alloy liquid carries out Overheating Treatment again, and the temperature of alloy superheat process controls between 1590 DEG C ~ 1620 DEG C;
4, cast alloys
After alloy melt Overheating Treatment terminates, induction furnace stops heating, allows aluminium alloy cool rapidly, casts, can obtain the ingot casting that even tissue is tiny when alloy temperature drops to 1570 DEG C ~ 1600 DEG C.
In the specific embodiment of the present invention, in order to the oxygen in removing system, anti-oxidation is all carry out in a vacuum in whole operating process.Especially molten alloy alloy liquid carry out the operating process of Overheating Treatment.
In a preferred embodiment of the invention, step 2) described in preheat temperature be 700 DEG C ~ 800 DEG C.
In another preferred embodiment of the present invention, step 3) 4) described in molten alloy alloy liquid carries out Overheating Treatment and cast alloys process is all carried out under 30 ~ 100Pa.
In the present invention, the key of described method is the cooperation between mold temperature, melt overheat temperature, melt cast temperature, thus reaches control hot-fluid, improves proportion of equiaxed grain.
Method of the present invention has following effect:
The method of raising SA508-3 low-alloy steel as-cast structure equiax crystal district of the present invention ratio can improve the structural homogenity of SA508-3 low-alloy steel as cast condition largely.The operating procedure of the inventive method is simple, only need optimize casting technological parameter (melt overheat temperature, formwork preheat temperature, cast temperature), can realize the effective control to SA508-3 low-alloy steel as-cast structure uniformity.Adopt process of the present invention, equiax crystal regional percentage can be increased largely, thus obtain the tiny alloy cast ingot of even tissue, be conducive to the comprehensive mechanical property improving SA508-3 low-alloy steel.Present invention process is simple, is easy to manipulation, is suitable for industrialized popularization and use,
Below the technique effect of design of the present invention, concrete structure and generation is described further.
Detailed description of the invention
The method of increase SA508-3 low-alloy steel as-cast structure equiax crystal district of the present invention ratio can go up crystal grain thinning largely, thus improves as-cast structure uniformity.In the specific embodiment of the present invention, described method only need determine casting process parameter (melt overheat temperature, formwork preheat temperature, cast temperature), can realize the effective control to SA508-3 low-alloy steel as-cast structure uniformity.
In a particular embodiment of the present invention, the instrument that the intermediate frequency furnace used is commonly used for this area, the present invention is not particularly limited this.
Embodiment 1:
1, alloy is configured
The raw material of configuration alloy is: carbon dust, pure manganese, pure molybdenum, pure nickel, pure chromium, silicon, pure vanadium, pure iron, alloy gross weight is 10Kg, and the weight ratio of each raw material is 25:150:60:100:25:25:4:9611.
2, preheating is carried out to casting mold
Casting mold is made into for raw material with 400 objects industry magnesia and Ludox, and mould dimension is φ 100mm × 200mm.Utilize intermediate frequency furnace to carry out preheating to casting mold, preheat temperature is set as 700 DEG C;
3, heating alloys alloy solution carries out Overheating Treatment
Utilize intermediate frequency furnace alloy to heat, until after alloy melting, then alloy carries out Overheating Treatment, and overtemperature is 1600 DEG C, and the overheated time is 5min.
4, cast alloys
After aluminium alloy Melt Overheating Treatment terminates, close intermediate frequency furnace, allow alloy cool rapidly, cast when alloy temperature drops to 1580 DEG C, obtain the ingot casting that even tissue is tiny.
5, ingot casting detects
Ingot casting is taken out, diametrically longitudinally cuts open, with sand paper by after surface grinding, corrode with the cross section of the picric acid aqueous solution to ingot casting distance bottom 70mm, find that equiax crystal district has exceeded 90% of whole area of section.
Embodiment 2:
1, alloy is configured
The raw material of configuration alloy is: carbon dust, pure manganese, pure molybdenum, pure nickel, pure chromium, silicon, pure vanadium, pure iron, alloy gross weight is 10Kg, and the weight ratio of each raw material is 25:150:60:100:25:25:4:9611.
2, preheating is carried out to casting mold
Casting mold is made into for raw material with 400 objects industry magnesia and Ludox, and mould dimension is φ 150mm × 250mm, and utilize resistance furnace to carry out preheating to casting mold, preheat temperature is set as 750 DEG C;
3, heating alloys alloy solution carries out Overheating Treatment
Utilize intermediate frequency furnace alloy to heat, until after alloy melting, alloy liquid carries out Overheating Treatment, and overtemperature is 1610 DEG C, and the overheated time is 10min;
4, cast alloys
After aluminium alloy Melt Overheating Treatment terminates, close intermediate frequency furnace, allow alloy cool rapidly, cast when alloy temperature drops to 1590 DEG C, obtain the ingot casting that even tissue is tiny.
5, ingot casting detects
Ingot casting is taken out, diametrically longitudinally cuts open, with sand paper by after surface grinding, corrode with the cross section of the picric acid aqueous solution to ingot casting distance bottom 60mm, find that equiax crystal district has exceeded 90% of whole area of section.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that the ordinary skill of this area just design according to the present invention can make many modifications and variations without the need to creative work.Therefore, all technical staff in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (3)
1. improve a method for SA508-3 low-alloy steel as-cast structure equiax crystal district ratio, it is characterized in that, comprise the steps:
Step 1) configuration alloy
Take carbon dust respectively, pure manganese, pure molybdenum, pure nickel, pure chromium, silicon, pure vanadium, pure iron be alloy raw material, configure described alloy raw material according to the upper limit of SA508-3 low-alloy steel component requirements;
Step 2) preheating casting mold
Adopt sand mo(u)ld be casting mold and carry out preheating to it, described preheat temperature is 600 DEG C ~ 800 DEG C;
Step 3) heating alloys alloy liquid carries out Overheating Treatment
Adopt intermediate frequency furnace alloy to heat, after its fusing, alloy liquid carries out Overheating Treatment again, and the temperature of described Overheating Treatment is 1590 DEG C ~ 1620 DEG C;
Step 4) cast alloys
After described aluminium alloy Overheating Treatment terminates, described intermediate frequency furnace stops heating, and the described aluminium alloy of cooling, casts, obtain the ingot casting that even tissue is tiny when temperature drops to 1570 DEG C ~ 1600 DEG C rapidly.
2. the method for claim 1, wherein step 3), 4) described in heating alloys alloy liquid carries out Overheating Treatment and casting cycle all carries out under 30 ~ 100Pa.
3. the method for claim 1, wherein the weight ratio of carbon dust, pure manganese, pure molybdenum, pure nickel, pure chromium, silicon, pure vanadium, pure iron is 25:150:60:100:25:25:4:9611 in described alloy raw material.
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| CN201310101225.1A CN103192061B (en) | 2013-03-26 | 2013-03-26 | Method for improving isometric crystal area proportion of SA508-3 low alloy steel as-cast structure |
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| CN103192061B true CN103192061B (en) | 2015-01-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6264770B1 (en) * | 1997-10-21 | 2001-07-24 | Korea Atomic Energy Research Inst. | Intercritical heat treatment process for toughness improvement of SA 508 GR.3 steel |
| JP2004339576A (en) * | 2003-05-16 | 2004-12-02 | Hitachi Ltd | Materials for constituting nuclear reactor |
| CN1609255A (en) * | 2004-09-17 | 2005-04-27 | 北京科技大学 | Process for producing rotary drill creeper tread material |
| CN101476088A (en) * | 2008-12-31 | 2009-07-08 | 钢铁研究总院 | R17Cr1Ni3Mo steel for nuclear pressure vessel and preparation thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6264770B1 (en) * | 1997-10-21 | 2001-07-24 | Korea Atomic Energy Research Inst. | Intercritical heat treatment process for toughness improvement of SA 508 GR.3 steel |
| JP2004339576A (en) * | 2003-05-16 | 2004-12-02 | Hitachi Ltd | Materials for constituting nuclear reactor |
| CN1609255A (en) * | 2004-09-17 | 2005-04-27 | 北京科技大学 | Process for producing rotary drill creeper tread material |
| CN101476088A (en) * | 2008-12-31 | 2009-07-08 | 钢铁研究总院 | R17Cr1Ni3Mo steel for nuclear pressure vessel and preparation thereof |
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