CN108642395A - A kind of needle-valve high nitrogen stainless steel material and preparation method thereof - Google Patents
A kind of needle-valve high nitrogen stainless steel material and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- 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
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- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
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- C23C8/26—Nitriding of ferrous surfaces
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- 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
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Abstract
The invention discloses a kind of needle-valve high nitrogen stainless steel materials, are related to technical field of stainless steel materials, and each constituent and its mass percent are：C：0.01 0.03%, Nb：0.04 0.08%, W：0.05 0.12%, Si：0.08 0.15%, Cr：4.6‑5.8%；Ni：0.65 0.79%, Mn：0.85 0.93%, Ti：0.06 0.08%, N：0.56 0.82%, rare earth element：0.21 0.27%, surplus is Fe and inevitable impurity.The invention also discloses a kind of preparation method of needle-valve high nitrogen stainless steel material, not only intensity higher, service life is long, and plasticity is more preferable, and the processing of casting is carried out convenient for the later stage, in addition, wear rate is substantially reduced, keeps needle-valve impact water in corrosion resistance obtained more excellent.
Description
Technical field
The present invention relates to technical field of stainless steel materials, more particularly to a kind of needle-valve high nitrogen stainless steel material and its system
Preparation Method.
Background technology
Needle-valve is a kind of reset valve, and valve plug is aciculiform, is mainly used as adjusting throughput.Reset valve require valve port open by
Gradual change is big, and maximum continuously can be adjusted fine from closing to opening.Needle plug can realize this function.Needle plug is general
The steel minute hand quenched with process, and the soft materials such as valve seat tin, copper are made.
The valve body of existing needle-valve is generally made of stainless steel material.Stainless steel is the abbreviation of stainless acid resistant steel, resistance to air, steaming
The weak corrosive medium such as vapour, water or the steel grade with rustless property are known as stainless steel, and by the medium resistant to chemical etching (changes such as acid, alkali, salt
Learn etch) corrosion steel grade be known as acid resisting steel.Nitrogen is austenite former strong in steel, can be shown as beneficial element addition
The mechanical property and corrosion resisting property for improving steel are write, and nitrogen content is relatively low in existing stainless steel material.
Invention content
The technical problem to be solved by the present invention is to the shortcomings that overcoming the prior art, it is stainless with high nitrogen provide a kind of needle-valve
Steel material and preparation method thereof.
In order to solve the above technical problems, technical scheme is as follows：
A kind of needle-valve high nitrogen stainless steel material, each constituent and its mass percent are：C：0.01-0.03%, Nb：
0.04-0.08%, W：0.05-0.12%, Si：0.08-0.15%, Cr：4.6-5.8%；Ni：0.65-0.79%, Mn：0.85-
0.93%, Ti：0.06-0.08%, N：0.56-0.82%, rare earth element：0.21-0.27%, surplus is for Fe and inevitably
Impurity.
Further, each constituent and its mass percent are：C：0.01%, Nb：0.04%, W：0.05%, Si：
0.08%, Cr：4.6%；Ni：0.65%, Mn：0.85%, Ti：0.06%, N：0.56%, rare earth element：0.21%, surplus is
Fe and inevitable impurity.
A kind of preceding needle-valve high nitrogen stainless steel material, each constituent and its mass percent are：C：0.03%,
Nb：0.08%, W：0.12%, Si：0.15%, Cr：5.8%；Ni：0.79%, Mn：0.93%, Ti：0.08%, N：0.82%,
Rare earth element：0.27%, surplus is Fe and inevitable impurity.
A kind of preceding needle-valve high nitrogen stainless steel material, each constituent and its mass percent are：C：0.02%,
Nb：0.06%, W：0.08%, Si：0.12%, Cr：5.2；Ni：0.72%, Mn：0.89%, Ti：0.07%, N：0.69%, it is dilute
Earth elements：0.24%, surplus is Fe and inevitable impurity.
A kind of preceding needle-valve high nitrogen stainless steel material, rare earth element is by La, Ce, Dy, Tb according to mass ratio 1:2:
1:4 mix.
A kind of preparation method of needle-valve high nitrogen stainless steel material, includes the following steps：
S1：It adds raw materials into smelting furnace, in-furnace temperature will be smelted and adjusted to 1500-1650 DEG C, raw material smelt straight
Molten steel is formed to melting；
S2：Refining agent is added into smelting furnace, and is passed through nitrogen, molten steel is refined, refining time 25-30min；
S3：Molten steel is cooled to 1250-1300 DEG C by way of water cooling, then molten steel is poured into ingot mould, cooling obtains
Billet；
S4：Billet is put into heating furnace, billet is heated to 1150-1200 DEG C, keeps the temperature and billet is put into oil after 15-20min
In quenched；Then billet is put into heating furnace, is heated to 850-900 DEG C, kept the temperature 60-80min, then take out base
Ingot is cooled to room temperature；
S5：Billet surface is cleaned in such a way that gas deoils, then billet surface is sprayed using alumina powder
Sand processing, the billet after blasting treatment is put into nitriding furnace, ammonium chloride and quartz sand is added into nitriding furnace, then to nitridation
It is passed through ammonia in stove, when ammonia dissociation rate is zero, nitridation in-furnace temperature is adjusted to 620-645 DEG C, nitrogen treatment is carried out；
S6：Ultrasonic examination processing is carried out to the billet after nitrogen treatment, stainless steel material is obtained after flaw detection is qualified.
A kind of preparation method of preceding needle-valve high nitrogen stainless steel material, melting nitrogen pressure in furnace is in S2
0.55-0.6MPa。
A kind of preparation method of preceding needle-valve high nitrogen stainless steel material, the cooling rate of molten steel is 22-25 in S3
℃/s。
The additive amount of a kind of preparation method of preceding needle-valve high nitrogen stainless steel material, ammonium chloride and quartz sand is with nitrogen
The stereometer for changing stove is respectively 65g/m3And 260g/m3。
The time of a kind of preparation method of preceding needle-valve high nitrogen stainless steel material, nitrogen treatment is 4-5h.
The beneficial effects of the invention are as follows：
(1) W is added in the present invention in the feed, can be reacted to form tungsten carbide with C in melting, can effectively improve stainless steel material
Hardness and corrosion resistance；Nb is added, can react to form carbide NbC with the C in raw material, the work of crystal grain thinning can be played
With further improving the castability of stainless steel material, more conducively plastic processing, can also prevent Cr from reacting to form carbon with C element
Compound and lead to grain boundary corrosion, to ensure that the intensity of stainless steel material；
(2) present invention is additionally added Si in the feed, the corrosion resistance of steel in mineral acid can be improved, to make stainless steel material
Acid resistance greatly improve；Ti is added again can form stable carbonization as carbide in smelting process
Object makes the strength enhancing 13-15% of molding stainless steel material；
(3) elements such as Cr, Si, Nb, Ti for being added in the present invention, can a series of oxidation films can be formed in pyrolytic semlting, from
And improve the antioxygenic property of stainless steel material；These rare earth elements of addition La, Ce, Dy, Tb again, due to the original of these elements
Sub- radius is big, can block the hole of oxidation film, inhibits the diffusion of ion, to keep the oxidation film of blade outer layer more stable；May be used also
So that partial oxidation film gos deep into alloy upper edge crystal boundary tree shape inside alloy, plays " pinning ", improve oxidation film
Binding force, prevent from peeling off, further improve the antioxygenic property of stainless steel material, the service life of stainless steel is made to extend
27-31%；
(4) present invention cools down to molten steel by the way of water cooling, improves cooling speed when preparing stainless steel material
Degree, increase degree of supercooling keeps the crystal grain of metal thinner to promote the spontaneous nucleation of metal；Benzene second is added when metallic solution crystallizes
One butadiene of alkene, one styrene block copolymer carries out non-spontaneous forming core as external nucleus, to make metal grain refine,
Make that there is uniform, tiny equiax crystal on the section of stainless steel material after molding, anisotropy is small, and deformation is more equal when processing
Even, plasticity higher is conducive to subsequent casting and plastic processing, keeps needle-valve more easily molded, and needle-valve toughness after molding is high, no
It will appear due to crack caused by thermal stress etc.；
(5) present invention first quenches the heat treatment process being tempered afterwards to stainless steel billet obtained progress, makes the pearl of austenitic formation
Body of light tissue is more uniformly distributed, and avoids the formation of different tissues and stainless steel material is made to generate brittle cracking, ensure that stainless steel
The toughness of material；
(6) present invention carries out nitrogen treatment to the stainless steel billet after heat treatment, and nitrogen infiltration layer, can be effective up to 0.2mm after processing
Ground improves the intensity of stainless steel, so that stainless steel material obtained is had excellent wearability, fatigue durability and corrosion resisting property, into one
Step improves the service life of needle-valve obtained.
Specific implementation mode
To make present disclosure be easier to be clearly understood, below according to specific implementation mode, the present invention is made
Further details of explanation.
Embodiment 1
A kind of needle-valve high nitrogen stainless steel material is present embodiments provided, each constituent and its mass percent are：C：
0.01%, Nb：0.04%, W：0.05%, Si：0.08%, Cr：4.6%；Ni：0.65%, Mn：0.85%, Ti：0.06%, N：
0.56%, rare earth element：0.21%, surplus is Fe and inevitable impurity.
Wherein, rare earth element by La, Ce, Dy, Tb according to mass ratio 1:2:1:4 mix.
The present embodiment additionally provides a kind of preparation method of needle-valve high nitrogen stainless steel material, includes the following steps：
S1：It adds raw materials into smelting furnace, in-furnace temperature will be smelted and adjusted to 1500 DEG C, raw material smelt until melting
Form molten steel；
S2：Refining agent is added into smelting furnace, and is passed through nitrogen, nitrogen pressure 0.55MPa refines molten steel, refining
Time is 25min；
S3：Molten steel is cooled to 1250 DEG C by way of water cooling, the cooling rate of molten steel is 22 DEG C/s, then pours into a mould molten steel
Into ingot mould, cooling obtains billet；
S4：Billet is put into heating furnace, billet is heated to 1150 DEG C, billet is put into oil after heat preservation 15min and is quenched
Fire；Then billet is put into heating furnace, is heated to 850 DEG C, kept the temperature 60min, then take out billet, be cooled to room temperature；
S5：Billet surface is cleaned in such a way that gas deoils, then billet surface is sprayed using alumina powder
Sand processing, the billet after blasting treatment is put into nitriding furnace, and ammonium chloride and quartz sand, ammonium chloride and stone are added into nitriding furnace
The additive amount of sand is respectively 65g/m with the stereometer of nitriding furnace3And 260g/m3, it is then passed through ammonia into nitriding furnace, waits for ammonia
When resolution ratio is zero, nitridation in-furnace temperature is adjusted to 620 DEG C, nitrogen treatment, processing time 4h are carried out；
S6：Ultrasonic examination processing is carried out to the billet after nitrogen treatment, stainless steel material is obtained after flaw detection is qualified.
Embodiment 2
A kind of needle-valve high nitrogen stainless steel material is present embodiments provided, each constituent and its mass percent are：C：
0.03%, Nb：0.08%, W：0.12%, Si：0.15%, Cr：5.8%；Ni：0.79%, Mn：0.93%, Ti：0.08%, N：
0.82%, rare earth element：0.27%, surplus is Fe and inevitable impurity.
Wherein, rare earth element by La, Ce, Dy, Tb according to mass ratio 1:2:1:4 mix.
The present embodiment additionally provides a kind of preparation method of needle-valve high nitrogen stainless steel material, includes the following steps：
S1：It adds raw materials into smelting furnace, in-furnace temperature will be smelted and adjusted to 1650 DEG C, raw material smelt until melting
Form molten steel；
S2：Refining agent is added into smelting furnace, and is passed through nitrogen, nitrogen pressure 0.6MPa refines molten steel, when refining
Between be 30min；
S3：Molten steel is cooled to 1300 DEG C by way of water cooling, the cooling rate of molten steel is 25 DEG C/s, then pours into a mould molten steel
Into ingot mould, cooling obtains billet；
S4：Billet is put into heating furnace, billet is heated to 1200 DEG C, billet is put into oil after heat preservation 20min and is quenched
Fire；Then billet is put into heating furnace, is heated to 900 DEG C, kept the temperature 80min, then take out billet, be cooled to room temperature；
S5：Billet surface is cleaned in such a way that gas deoils, then billet surface is sprayed using alumina powder
Sand processing, the billet after blasting treatment is put into nitriding furnace, and ammonium chloride and quartz sand, ammonium chloride and stone are added into nitriding furnace
The additive amount of sand is respectively 65g/m with the stereometer of nitriding furnace3And 260g/m3, it is then passed through ammonia into nitriding furnace, waits for ammonia
When resolution ratio is zero, nitridation in-furnace temperature is adjusted to 645 DEG C, nitrogen treatment, processing time 5h are carried out；
S6：Ultrasonic examination processing is carried out to the billet after nitrogen treatment, stainless steel material is obtained after flaw detection is qualified.
Embodiment 3
A kind of needle-valve high nitrogen stainless steel material is present embodiments provided, each constituent and its mass percent are：C：
0.02%, Nb：0.06%, W：0.08%, Si：0.12%, Cr：5.2；Ni：0.72%, Mn：0.89%, Ti：0.07%, N：
0.69%, rare earth element：0.24%, surplus is Fe and inevitable impurity.
Wherein, rare earth element by La, Ce, Dy, Tb according to mass ratio 1:2:1:4 mix.
The present embodiment additionally provides a kind of preparation method of needle-valve high nitrogen stainless steel material, includes the following steps：
S1：It adds raw materials into smelting furnace, in-furnace temperature will be smelted and adjusted to 1580 DEG C, raw material smelt until melting
Form molten steel；
S2：Refining agent is added into smelting furnace, and is passed through nitrogen, nitrogen pressure 0.58MPa refines molten steel, refining
Time is 28min；
S3：Molten steel is cooled to 1280 DEG C by way of water cooling, the cooling rate of molten steel is 24 DEG C/s, then pours into a mould molten steel
Into ingot mould, cooling obtains billet；
S4：Billet is put into heating furnace, billet is heated to 1180 DEG C, billet is put into oil after heat preservation 18min and is quenched
Fire；Then billet is put into heating furnace, is heated to 875 DEG C, kept the temperature 70min, then take out billet, be cooled to room temperature；
S5：Billet surface is cleaned in such a way that gas deoils, then billet surface is sprayed using alumina powder
Sand processing, the billet after blasting treatment is put into nitriding furnace, and ammonium chloride and quartz sand, ammonium chloride and stone are added into nitriding furnace
The additive amount of sand is respectively 65g/m with the stereometer of nitriding furnace3And 260g/m3, it is then passed through ammonia into nitriding furnace, waits for ammonia
When resolution ratio is zero, nitridation in-furnace temperature is adjusted to 630 DEG C, nitrogen treatment, processing time 5h are carried out；
S6：Ultrasonic examination processing is carried out to the billet after nitrogen treatment, stainless steel material is obtained after flaw detection is qualified.
Comparative example：The stainless steel material of commercially available Wuxi Gang Zhong metal materials Co., Ltd production.
Embodiment 1- embodiments 3 and comparative example are subjected to contrast test test, properties are measured by national standard, are tested
Condition and other experiment material all sames, test result are as shown in table 1：
| Pilot project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example |
| Brinell hardness/HB | 268 | 271 | 277 | 262 |
| It is broken shrinking percentage/% | 62.5 | 61.3 | 66.8 | 59.1 |
| Tensile strength/MPa | 561 | 567 | 578 | 552 |
| Wear rate/mm/s | 6.652*10-6 | 6.481*10-6 | 5.729*10-6 | 7.353*10-6 |
Table 1
As can be seen from Table 1, the Brinell hardness for the needle-valve high nitrogen stainless steel material that prepared by the present invention is about 272HB, and fracture is received
Shrinkage 63.5%, tensile strength are about 569MPa, and wear rate is about 6.287*10-6mm/s。
Compared with each item data of comparative example, not only Brinell hardness is more with high nitrogen stainless steel material for needle-valve prepared by the present invention
Height, tensile strength higher, and it is broken shrinking percentage bigger, in addition, wear rate is then significantly lower than comparative example.It can thus be seen that
Compared with the stainless steel material of market sale, needle-valve prepared by present invention high nitrogen stainless steel material not only intensity higher uses
Long lifespan, and plasticity is more preferable, and the processing of casting is carried out convenient for the later stage, in addition, wear rate is substantially reduced, keeps needle-valve obtained resistance to
Water erosion performance is more excellent.
In addition to the implementation, the present invention can also have other embodiment；It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (10)
1. a kind of needle-valve high nitrogen stainless steel material, it is characterised in that：Each constituent and its mass percent are：C：0.01-
0.03%, Nb：0.04-0.08%, W：0.05-0.12%, Si：0.08-0.15%, Cr：4.6-5.8%；Ni：0.65-0.79%, Mn：
0.85-0.93%, Ti：0.06-0.08%, N：0.56-0.82%, rare earth element：0.21-0.27%, surplus is for Fe and unavoidably
Impurity.
2. a kind of needle-valve high nitrogen stainless steel material according to claim 1, it is characterised in that：Each constituent and its matter
Measuring percentage is：C：0.01%, Nb：0.04%, W：0.05%, Si：0.08%, Cr：4.6%；Ni：0.65%, Mn：0.85%, Ti：
0.06%, N：0.56%, rare earth element：0.21%, surplus is Fe and inevitable impurity.
3. a kind of needle-valve high nitrogen stainless steel material according to claim 1, it is characterised in that：Each constituent and its matter
Measuring percentage is：C：0.03%, Nb：0.08%, W：0.12%, Si：0.15%, Cr：5.8%；Ni：0.79%, Mn：0.93%, Ti：
0.08%, N：0.82%, rare earth element：0.27%, surplus is Fe and inevitable impurity.
4. a kind of needle-valve high nitrogen stainless steel material according to claim 1, it is characterised in that：Each constituent and its matter
Measuring percentage is：C：0.02%, Nb：0.06%, W：0.08%, Si：0.12%, Cr：5.2；Ni：0.72%, Mn：0.89%, Ti：
0.07%, N：0.69%, rare earth element：0.24%, surplus is Fe and inevitable impurity.
5. according to any needle-valve high nitrogen stainless steel materials of claim 1-4, it is characterised in that：The rare earth element by
La, Ce, Dy, Tb are according to mass ratio 1:2:1:4 mix.
6. a kind of preparation method of needle-valve high nitrogen stainless steel material as described in claim 1, it is characterised in that：Including following
Step：
S1：It adds raw materials into smelting furnace, in-furnace temperature will be smelted and adjusted to 1500-1650 DEG C, raw material smelt straight
Molten steel is formed to melting；
S2：Refining agent is added into smelting furnace, and is passed through nitrogen, molten steel is refined, refining time 25-30min；
S3：Molten steel is cooled to 1250-1300 DEG C by way of water cooling, then molten steel is poured into ingot mould, cooling obtains
Billet；
S4：Billet is put into heating furnace, billet is heated to 1150-1200 DEG C, keeps the temperature and billet is put into oil after 15-20min
In quenched；Then billet is put into heating furnace, is heated to 850-900 DEG C, kept the temperature 60-80min, then take out base
Ingot is cooled to room temperature；
S5：Billet surface is cleaned in such a way that gas deoils, then billet surface is sprayed using alumina powder
Sand processing, the billet after blasting treatment is put into nitriding furnace, ammonium chloride and quartz sand is added into nitriding furnace, then to nitridation
It is passed through ammonia in stove, when ammonia dissociation rate is zero, nitridation in-furnace temperature is adjusted to 620-645 DEG C, nitrogen treatment is carried out；
S6：Ultrasonic examination processing is carried out to the billet after nitrogen treatment, stainless steel material is obtained after flaw detection is qualified.
7. a kind of preparation method of needle-valve high nitrogen stainless steel material according to claim 6, it is characterised in that：The S2
Middle melting nitrogen pressure in furnace is 0.55-0.6MPa.
8. a kind of preparation method of needle-valve high nitrogen stainless steel material according to claim 6, it is characterised in that：The S3
The cooling rate of middle molten steel is 22-25 DEG C/s.
9. a kind of preparation method of needle-valve high nitrogen stainless steel material according to claim 6, it is characterised in that：The chlorine
The additive amount of change ammonium and quartz sand is respectively 65g/m with the stereometer of nitriding furnace3And 2605g/m3。
10. a kind of preparation method of needle-valve high nitrogen stainless steel material according to claim 6, it is characterised in that：It is described
The time of nitrogen treatment is 4-5h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810970575.4A CN108642395A (en) | 2018-08-24 | 2018-08-24 | A kind of needle-valve high nitrogen stainless steel material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810970575.4A CN108642395A (en) | 2018-08-24 | 2018-08-24 | A kind of needle-valve high nitrogen stainless steel material and preparation method thereof |
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| CN109112388A (en) * | 2018-10-30 | 2019-01-01 | 江苏亿超工程塑料有限公司 | A kind of composition metal tee pipe fitting and preparation method thereof |
| CN109848404A (en) * | 2019-03-12 | 2019-06-07 | 湖南恒基粉末科技有限责任公司 | A kind of high nitrogen stainless steel powder and preparation method thereof, stainless steel |
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