CN103343201A - Method for improving high-carbon martensitic stainless steel carbide - Google Patents
Method for improving high-carbon martensitic stainless steel carbide Download PDFInfo
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- CN103343201A CN103343201A CN2013102839558A CN201310283955A CN103343201A CN 103343201 A CN103343201 A CN 103343201A CN 2013102839558 A CN2013102839558 A CN 2013102839558A CN 201310283955 A CN201310283955 A CN 201310283955A CN 103343201 A CN103343201 A CN 103343201A
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Abstract
The invention relates to a method for improving high-carbon martensitic stainless steel carbide, and the method sequentially comprises the following steps of: I, placing a stainless steel continuous casting blank or molded steel ingot containing 0.36-1.10wt% of carbon and 15.0-18.0wt% of chromium into an electric heating furnace of an argon purging and heating chamber; II, slowly heating up to 1200-1300 DEG C at the heating speed less than 200 DEG C/h, keeping the circulation of argon during the heating process, and keeping the temperature for 6-40 hours under the protection of argon; III, cooling along with the furnace, separating carbide from austenite crystal boundary and transgranular below 3 mu m in size during the cooling process; feeding argon used as protective gas. The method for improving high-carbon martensitic stainless steel carbide can be used for obtaining uniform distributed carbide below 3 mu m in size, so that the carbide can be used for manufacturing cutters and moulds with excellent quality.
Description
Technical field
The present invention relates to a kind of stainless steel that method, particularly weight percent that high carbon martensite is the stainless steel carbide comprise 0.36～1.10 carbon, 15.0～18.0% chromium that improves.
Background technology
In general, be used for the carbon content of razor blade, cutter and Mold Making 0.36～1.10%, chromium content is that stainless steel plate and profiled material mainly pass through process productions such as continuous casting (mould notes), hot-work, annealing, cold working, annealing at 15.0～18.0% high carbon martensite.
In the process of setting of continuous casting or mould notes, because the segregation of carbon and chromium, difference according to carbon and chromium content, between dentrite and equiax crystal, can form a large amount of liquation carbide, this carbide is different with the carbide of separating out in hot-work and annealing process (below the size 3 μ m), size is generally between 10～100 μ m, this carbide is difficult to eliminate in the follow-up course of processing, can form formation of crack and source of corrosion on the one hand, influence the duration of service of cutter and mould, also can reduce the content of dissolved carbon and chromium in the steel in addition, reduce the hardness of cutter and mould.
Owing to this reason, the method that has provided thin strap continuous casting among the patent CN102665964A is the primary carbide that exists in the stainless steel to eliminate high carbon martensite, but this method is not suitable for die steel, and needs equipment is transformed, and cost is high; In addition, this method is not suitable for the high carbon martensite stainless steel of carbon content more than 0.8%.
Summary of the invention
Goal of the invention of the present invention is to provide a kind of method that high carbon martensite is the stainless steel carbide of improving, and the facility investment of this kind method is little, and technological operation is simple, applied range, and can satisfy the requirement of the hardness of making cutter and mould simultaneously.
In order to satisfy above-mentioned requirements, method provided by the invention comprises following sequential steps:
IThe stainless steel casting blank or the mould that weight percent are comprised 0.36～1.10% carbon, 15.0～18.0% chromium are annotated the electrical heater that steel ingot is put into the argon purge heating chamber;
IISlowly be warming up to 1200～1300 ℃ then, heat-up rate is no more than 200 ℃/h, in the heat-processed, keep the argon gas circulation, according to the size of continuously cast bloom or steel ingot, soaking time is 6～40 hours, argon shield simultaneously, make the liquation carbide that is of a size of between 10～100 μ m at high temperature dissolve diffusion, be dissolved in the high temperature austenite;
IIIFurnace cooling then, in process of cooling, carbide is separated out from austenite grain boundary and intracrystalline, is of a size of below the 3 μ m; Be the oxidization burning loss that prevents from producing in the high-temperature heating process, pass to argon gas as shielding gas.
Beneficial effect of the present invention
Make in continuous casting or the mould notes process and be of a size of the above liquation carbide of 10 μ m because segregation produces, dissolving diffusion at high temperature obtains being of a size of the following equally distributed carbide of 3 μ m at last, thereby can be used for making cutter and the mould of excellent quality.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.Those of ordinary skills do not have the technical scheme that high carbon martensite is the stainless steel carbide of improving that obtains under the creative work prerequisite, and all belong to protection scope of the present invention.
Embodiment
The mass percent of the composition of the Martensite Stainless Steel steel ingot in the present embodiment is as follows:
C：0.80%； Cr:17%； Si:0.4%； Mn:0.5%； P:0.035%；
S:0.002%; Ni:0.3%; Mo:0.7%; V:0.15%; All the other are Fe and unavoidable impurities.
The Martensite Stainless Steel steel ingot is to use electric furnace to add the smelting of argon oxygen stove, and the mass percent that goes out composition of steel reaches following requirement:
C：0.80%； Cr:17%； Si:0.4%； Mn:0.5%； P:0.035%；
S:0.002%; Ni:0.3%; Mo:0.7%; V:0.15%; All the other are Fe and unavoidable impurities.
It is 7.2 tons of slab ingots that mould is annotated, the slab ingot 500 * 1200mm that is of a size of suitable for reading, end opening size 400 * 1100mm.
Annotated loose ingot after 5 hours, the demoulding.Steel ingot is delivered to electrical heater immediately after the demoulding, and furnace temp is 800 ℃, uses earlier the argon purge heating chamber before the shove charge;
After the shove charge with per hour 100 ℃ be warming up to 1280 ℃, be incubated 15 hours, in the heat-processed, keep the argon gas circulation, argon flow amount 30L/h, insulation finishes the back and is chilled to 500 ℃ with stove, the air cooling of coming out of the stove.
In the present embodiment, carbide is separated out from austenite grain boundary and intracrystalline, and size is less than 3 μ m.
Claims (1)
1. one kind is improved the method that high carbon martensite is the stainless steel carbide, and it comprises following sequential steps:
IThe stainless steel casting blank or the mould that weight percent are comprised 0.36～1.10% carbon, 15.0～18.0% chromium are annotated the electrical heater that steel ingot is put into the argon purge heating chamber;
IISlowly be warming up to 1200～1300 ℃ then, heat-up rate is no more than 200 ℃/h, in the heat-processed, keep the argon gas circulation, soaking time is 6～40 hours, argon shield simultaneously, make the liquation carbide that is of a size of between 10～100 μ m at high temperature dissolve diffusion, be dissolved in the high temperature austenite;
IIIFurnace cooling then, in process of cooling, carbide is separated out from austenite grain boundary and intracrystalline, is of a size of below the 3 μ m; Pass to argon gas as shielding gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102839558A CN103343201A (en) | 2013-07-08 | 2013-07-08 | Method for improving high-carbon martensitic stainless steel carbide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102839558A CN103343201A (en) | 2013-07-08 | 2013-07-08 | Method for improving high-carbon martensitic stainless steel carbide |
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| CN103343201A true CN103343201A (en) | 2013-10-09 |
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| CN2013102839558A Pending CN103343201A (en) | 2013-07-08 | 2013-07-08 | Method for improving high-carbon martensitic stainless steel carbide |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114507775A (en) * | 2021-11-19 | 2022-05-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Heating method for improving primary carbide of ultrahigh-carbon martensitic stainless steel continuous casting billet |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0867950A (en) * | 1994-08-26 | 1996-03-12 | Nisshin Steel Co Ltd | Martensitic stainless steel excellent in strength and toughness and its production |
| JP2002155316A (en) * | 2000-11-16 | 2002-05-31 | Nisshin Steel Co Ltd | Method for producing high carbon martensitic stainless steel sheet |
| CN1402798A (en) * | 1999-12-02 | 2003-03-12 | Ati产权公司 | Martensitic stainless steel and steelmaking process |
| KR20130000841A (en) * | 2011-06-24 | 2013-01-03 | 주식회사 포스코 | Martensitic stainless steel and method of manufacturing it |
-
2013
- 2013-07-08 CN CN2013102839558A patent/CN103343201A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0867950A (en) * | 1994-08-26 | 1996-03-12 | Nisshin Steel Co Ltd | Martensitic stainless steel excellent in strength and toughness and its production |
| CN1402798A (en) * | 1999-12-02 | 2003-03-12 | Ati产权公司 | Martensitic stainless steel and steelmaking process |
| JP2002155316A (en) * | 2000-11-16 | 2002-05-31 | Nisshin Steel Co Ltd | Method for producing high carbon martensitic stainless steel sheet |
| KR20130000841A (en) * | 2011-06-24 | 2013-01-03 | 주식회사 포스코 | Martensitic stainless steel and method of manufacturing it |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114507775A (en) * | 2021-11-19 | 2022-05-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Heating method for improving primary carbide of ultrahigh-carbon martensitic stainless steel continuous casting billet |
| CN114507775B (en) * | 2021-11-19 | 2023-09-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Heating method for improving primary carbide of ultra-high carbon martensitic stainless steel continuous casting billet |
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Application publication date: 20131009 |