CN108085591A - A kind of steel plate HTNM400 and its production method with low-welding crack-sensitive energy - Google Patents
A kind of steel plate HTNM400 and its production method with low-welding crack-sensitive energy Download PDFInfo
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- CN108085591A CN108085591A CN201711194681.XA CN201711194681A CN108085591A CN 108085591 A CN108085591 A CN 108085591A CN 201711194681 A CN201711194681 A CN 201711194681A CN 108085591 A CN108085591 A CN 108085591A
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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
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/18—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
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- 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
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Abstract
The invention discloses a kind of high temperature resistant type wear-resisting steel plate HTNM400 with low-welding crack-sensitive energy, thickness is more than 12mm, includes the chemical composition of following mass percent：C≤0.25%, Si≤0.70%, Mn≤1.60%, P≤0.025%, S≤0.010%, Cr≤1.4%, Ni≤1.5%, Mo≤1.5%, B≤0.004%, it is other for Fe and relict element, Ceq≤0.58, Pcm≤0.31.Compared with prior art, uniform, the refinement of steel plate interior tissue has not only been effectively ensured in the present invention, and performance is stablized, and reproducibility is strong, meets Hydropower Unit steel plate particular/special requirement, good quality of detecting a flaw, can wide popularization and application in manufacture hydroelectric facility component.
Description
Technical field
The present invention relates to Wide and Heavy Plates production technical fields, and in particular to it is a kind of with low-welding crack-sensitive can
High temperature resistant type wear-resisting steel plate HTNM400 and its production method.
Background technology
Low-welding crack-sensitive high temperature resistant type wear-resisting steel plate is mainly used for steel, cement, thermal power plant and recycling
With the high temperature wear resistance applications industry such as pitch, to solve the wear problem in 150-500 DEG C of high temperature range.This grinds
The high temperature resistant type abrasion-resistant stee of hair not only the case hardness at a temperature of 500 DEG C reach 70% hardness requirement, need to also be in non-production state
Under ensure low-temperature impact toughness at a temperature of -40 DEG C, and ensure inner hardness and case hardness all in technology claimed range, especially
It is suitble in cold district using high-temperature wearable industry etc., it is desirable that high tenacity and need to ensure the purposes such as inner hardness, have simultaneously
Standby high proper alignment crack-sensitivity performance, therefore in face of the market demand, is tried with reference to existing process equipment and production capacity
System.
The content of the invention
In order to solve the above technical problems, the object of the present invention is to provide a kind of resistance to height with low-welding crack-sensitive energy
Warm type wear-resisting steel plate HTNM400 can be effectively ensured the case hardness at a temperature of 500 DEG C and reach 70%, -40 under non-production state
Ensure low-temperature impact toughness at a temperature of DEG C, meet inner hardness and case hardness all in technology claimed range, be particluarly suitable for
Cold district is applied in high-temperature wearable industry.
It is a further object of the present invention to provide a kind of high temperature resistant type wear-resisting steel plates with low-welding crack-sensitive energy
The production method of HTNM400.
In order to achieve the above objectives, the technical solution adopted by the present invention is：It is a kind of that there is the resistance to of low-welding crack-sensitive energy
High temperature modification wear-resisting steel plate HTNM400, thickness are more than 12mm, include the chemical composition of following mass percent：C≤0.25%、Si
≤ 0.70%, Mn≤1.60%, P≤0.025%, S≤0.010%, Cr≤1.4%, Ni≤1.5%, Mo≤1.5%, B≤0.004%,
It is Fe and relict element, Ceq≤0.58, Pcm≤0.31.
In the above-mentioned technical proposal that the present invention uses, carbon content determines the smelting, rolling, the mistake of heat treatment of HTNM400
Journey technological temperature system；Manganese can improve the intensity of HTNM400, reduce the critical point of HTNM400, improve its through hardening performance, stablize
And expand austenite γ phase regions, critical cooling rate during quenching cooling is reduced, deformation during quenching is also smaller, is suitable for
The requirement of HTNM400 slabs；Vanadium increases the temper resistance of hardened steel, and generates post-curing effect, the carbonization spread of vanadium
Height, crystal grain thinning reduce superheated susceptivity, increase temper resistance and wearability, so as to ensure that the use of high temperature abrasion-resistant steel
Performance；As a kind of most tiny carbide, it can be evenly distributed chromium carbide in steel, thus with higher wearability and
Higher-strength, hardness, yield point can make the structure refinement of steel due to it and be uniformly distributed again, therefore plasticity, toughness, another Cr
It is combined with Mo, can increase the retained austenite in hardened steel, and help to obtain the Carbide Phases for needing degree of grinding, chromium is also
It can increase the supercooling ability of austenite, improve martensite, bainite starts the temperature of transformation, to promote martensite and bainite
It is formed, suitable molybdenum, boron can dramatically increase the quenching degree of HTNM400, the transformation of austenite subcooling process medium pearlite pushed away
Late.
A kind of production method of the high temperature resistant type wear-resisting steel plate HTNM400 with low-welding crack-sensitive energy, feature
It is to comprise the following steps：
1）It smelts：Impurity component in molten steel is mingled with etc. including S, P and each type oxide and is easily generated in the process of setting of molten steel
Serious segregation, mechanical performance and metallurgical quality to special heavy plate face can generate large effect.Preferable internal soundness obtains
, and level-one non-destructive testing standard is ensured compliance with, the smelting of clean steel is basic, is mainly ensured in terms of two, first, in molten steel
Total rank of non-metallic inclusion must be within 4.0, second is that strictly controlling the content of five big harmful elements in molten steel；Outside LF stoves
Refining has fine tuning ingredient, argon gas stirring, foam slag burialing arc heating, reducing atmosphere white slag etc., and VD arrives at a station 1668 DEG C, takes out 5min in advance
To vacuum, pressurize 20min breaks sky, after soft blow 5min 1586 DEG C it is leaving from station, determine hydrogen 0.79ppm and comply with standard；It is required that in the true of 67Pa
Under reciprocal of duty cycle, the dwell time >=20min, while pressure maintaining period molten steel is required to seethe and is worked well；VD temperature leaving from station:1570~1575
℃；
2）Heating rolling：Heating process ensures abundant solid solution of the micro alloying element in austenitic area, takes the big pressure of high temperature low speed
Lower technique fully crushes the dendrite in steel ingot, and deformation extent is bigger, and forming core area driving force, density are bigger, brilliant after recrystallizing repeatedly
Grain just becomes more tiny, but is rolled in the operation of rolling using " the big pressure of high temperature low speed " mode, to the ability of milling train in itself
It is more demanding, it if since mill capacity is small, cannot realize " big pressure ", so as to which roll-force cannot infiltrate into center portion, easily lead
The nonuniform organization on steel plate thickness direction is caused, and cannot play the role of " pressing " steel ingot cast inside residual defect, directly
The impact flexibility of finished steel plate and flaw detection quality are affected, use " the big pressure of high temperature low speed " therefore and beats high pressure in preceding 3 passage
Water hardening surface, permeates roll-force, and to reduce surface second iron sheet growing amount, open cold collector in 5 ~ 8 groups carry out 2 times it is cold
But, slow cooling, cold temperature >=450 DEG C of heap, heap cool time >=4 day, to ensure internal soundness are then carried out；
3）Heat treatment：Any Heat-Treatment of Steel is based on heating, keep the temperature, cool down, and in most of heat treatment process
In, the formation of austenite and the size of austenite grain, the transformation feature of austenite and transformation production during to then controlling cooling
The tissue and performance of object all have a significant effect；Austenitic formation follows the universal law of phase transformation in heating process, that is, includes shape
Core and the basic process grown up.It grows up the stage there are one corresponding crystal grain at each temperature, when crystal grain reaches certain size
Afterwards, trend of growing up can gradually weaken；Firing rate is bigger, and austenite nucleation rate is bigger, when austenite stops in insulating process
Between it is shorter, crystal grain is thinner；Coarse austenite grain can form coarse cooling transformation product, so as to deteriorate the room temperature mechanical property of steel
Can, especially impact property, therefore HTNM400 take heat treatment firing rate when, under equipment maximum heating capabilities might, with
Prestissimo heats up, and keeps its higher degree of superheat, and controls holding temperature and soaking time, to ensure its crystal grain refinement journey
Degree, the specific austenitizing temperature for using 930 DEG C carry out CCT curve to HTNM400 using analogue and simulate,
Shown, when being cooled to low temperature with the speed of 0.2 DEG C/s, to be organized as ferrite/pearlite by analog reslt；With 0.2
When the speed of 3 DEG C/s of ＜ V ＜ is cooled to low temperature, ferrite/pearlite+bainite is organized as；With the speed of 3 11 DEG C/s of ＜ V ＜
When degree is cooled to low temperature, pearlite+bainite+martensite is organized as；It is obtained to be organized as 11 DEG C/s of cooling velocity ＞
Single martensite, therefore roller press type quenching is carried out using rolled quenching machine, it both ensure that the plate shape of steel plate, and had utilization >=11
DEG C/cooling velocity of s obtains single martensitic structure, to ensure tissue still stable under the hardness of steel plate and high temperature, from
And obtain the present invention.
The present invention adds the microalloy elements such as Cr, Mo, V, Ni, Nb to ensure by using low C, appropriate Mn, Als
The obdurability matching of steel plate；By the way that Cr+Mo+V total amounts is controlled to realize, relatively low carbon equivalent is horizontal, ensures the welding performance of plate；
By controlling feed stock for blast furnace source, field trash classification and content are reduced；By controlling P, S and [H], reducing complex inclusion and having
Evil gas content；Ensure that field trash fully floats by Argon before casting；It is evenly heated by high temperature, ensures the suitable of rolling pressure
Profit carries out, and promotes to roll the preliminary refinement of state tissue, while as cast condition defect is effectively pressed；Pass through the cold self tempering of high temperature nuclear reactor
Further reduce steel plate internal gas content；By controlling the fluctuation range of temperature in quenching and drawing process, while pass through control
Coolant water temperature processed, Gas Stirring accelerate quenching cooling velocity, and uniform, the refinement of steel plate interior tissue has been effectively ensured, and performance is steady
Fixed, reproducibility is strong, meets inner hardness and case hardness all in technology claimed range, is particluarly suitable for cold district application
In high-temperature wearable industry.
Specific embodiment
With reference to embodiment, the technical characteristic of the present invention is further described.
The embodiment of the present invention is a kind of high temperature resistant type wear-resisting steel plate with low-welding crack-sensitive energy of production
HTNM400, thickness 20mm include the chemical composition of following mass percent：C≤0.25%、Si≤0.70%、Mn≤
1.60%th, P≤0.025%, S≤0.010%, Cr≤1.4%, Ni≤1.5%, Mo≤1.5%, B≤0.004%, other is Fe and residual
Element, Ceq≤0.58, Pcm≤0.31.
Above-described embodiment is realized by following steps：1）It smelts：Impurity component in molten steel, including S, P and all kinds of oxygen
Compound is mingled with etc. easily generates serious segregation in the process of setting of molten steel, equal to the mechanical performance and metallurgical quality in special heavy plate face
Large effect can be generated.Preferable internal soundness obtains, and ensures compliance with level-one non-destructive testing standard, and the smelting of clean steel is root
This, mainly ensures in terms of two, first, total rank of non-metallic inclusion must be within 4.0, second is that strictly in molten steel
Control the content of five big harmful elements in molten steel；There is fine tuning ingredient, argon gas to stir for LF external refinings, foam slag burialing arc heats,
Reducing atmosphere white slag etc., VD arrive at a station 1668 DEG C, and for the pre- 5min that takes out to vacuum, pressurize 20min breaks sky, after soft blow 5min 1586 DEG C from
It stands, determines hydrogen 0.79ppm and comply with standard；It is required that under the vacuum degree of 67Pa, the dwell time >=20min, while require pressure maintaining period
Molten steel, which seethes, to work well；VD temperature leaving from station:1570~1575℃；
2）Heating rolling：Heating process ensures abundant solid solution of the micro alloying element in austenitic area, takes the big pressure of high temperature low speed
Lower technique fully crushes the dendrite in steel ingot, and deformation extent is bigger, and forming core area driving force, density are bigger, brilliant after recrystallizing repeatedly
Grain just becomes more tiny, but is rolled in the operation of rolling using " the big pressure of high temperature low speed " mode, to the ability of milling train in itself
It is more demanding, it if since mill capacity is small, cannot realize " big pressure ", so as to which roll-force cannot infiltrate into center portion, easily lead
The nonuniform organization on steel plate thickness direction is caused, and cannot play the role of " pressing " steel ingot cast inside residual defect, directly
The impact flexibility of finished steel plate and flaw detection quality are affected, use " the big pressure of high temperature low speed " therefore and beats high pressure in preceding 3 passage
Water hardening surface, permeates roll-force, and to reduce surface second iron sheet growing amount, open cold collector in 5 ~ 8 groups carry out 2 times it is cold
But, slow cooling, cold temperature >=450 DEG C of heap, heap cool time >=4 day, to ensure internal soundness are then carried out；
3）Heat treatment：Any Heat-Treatment of Steel is based on heating, keep the temperature, cool down, and in most of heat treatment process
In, the formation of austenite and the size of austenite grain, the transformation feature of austenite and transformation production during to then controlling cooling
The tissue and performance of object all have a significant effect.Austenitic formation follows the universal law of phase transformation in heating process, that is, includes shape
Core and the basic process grown up.It grows up the stage there are one corresponding crystal grain at each temperature, when crystal grain reaches certain size
Afterwards, trend of growing up can gradually weaken.Firing rate is bigger, and austenite nucleation rate is bigger, when austenite stops in insulating process
Between it is shorter, crystal grain is thinner.Coarse austenite grain can form coarse cooling transformation product, so as to deteriorate the room temperature mechanical property of steel
Can, especially impact property, therefore HTNM400 take heat treatment firing rate when, under equipment maximum heating capabilities might, with
Prestissimo heats up, and keeps its higher degree of superheat, and controls holding temperature and soaking time, to ensure its crystal grain refinement journey
Degree, the specific austenitizing temperature for using 930 DEG C carry out CCT curve to HTNM400 using analogue and simulate,
Shown, when being cooled to low temperature with the speed of 0.2 DEG C/s, to be organized as ferrite/pearlite by analog reslt；With 0.2
When the speed of 3 DEG C/s of ＜ V ＜ is cooled to low temperature, ferrite/pearlite+bainite is organized as；With the speed of 3 11 DEG C/s of ＜ V ＜
When degree is cooled to low temperature, pearlite+bainite+martensite is organized as；It is obtained to be organized as 11 DEG C/s of cooling velocity ＞
Single martensite, therefore roller press type quenching is carried out using rolled quenching machine, it both ensure that the plate shape of steel plate, and had utilization >=11
DEG C/cooling velocity of s obtains single martensitic structure, to ensure tissue still stable under the hardness of steel plate and high temperature, from
And obtain a kind of welding crack sensibility high temperature resistant type abrasion-resistant stee.
At different temperatures, relative hardness changes such as following table to the embodiment of the present invention：
The embodiment of the present invention adds the microalloy elements such as Cr, Mo, V, Ni, Nb by using low C, appropriate Mn, Als
Ensure the obdurability matching of steel plate；By the way that Cr+Mo+V total amounts is controlled to realize, relatively low carbon equivalent is horizontal, and CEV ＜ 0.55% ensure
The welding performance of plate；By controlling feed stock for blast furnace source, field trash classification and content are reduced；By controlling P, S and [H], drop
Low complex inclusion and pernicious gas content；Ensure that field trash fully floats by Argon before casting；It is evenly heated by high temperature,
Ensure being smoothed out for rolling pressure, promote to roll the preliminary refinement of state tissue, while as cast condition defect is effectively pressed；It is logical
Crossing the cold self tempering of high temperature nuclear reactor further reduces steel plate internal gas content；By the fluctuation for controlling temperature in quenching and drawing process
Scope, while by controlling coolant water temperature, Gas Stirring, accelerate quenching cooling velocity, steel plate interior tissue has been effectively ensured
Uniformly, refine, performance is stablized, and reproducibility is strong, meets Hydropower Unit steel plate particular/special requirement, good quality of detecting a flaw, can be extensive
It is applied to manufacture hydroelectric facility component.
Described above is only presently preferred embodiments of the present invention, and above-mentioned specific embodiment is not limitation of the present invention,
Retouching, modification or the equivalent substitution that all those of ordinary skill in the art are made as described above belong to the guarantor of the present invention
Protect scope.
Claims (2)
1. a kind of steel plate HTNM400 with low-welding crack-sensitive energy, it is characterised in that：Its thickness is more than 12mm, comprising
The chemical composition of following mass percent：C≤0.25%、Si≤0.70%、Mn≤1.60%、P≤0.025%、S≤0.010%、Cr
≤ 1.4%, Ni≤1.5%, Mo≤1.5%, B≤0.004%, it is other for Fe and relict element, Ceq≤0.58, Pcm≤0.31.
2. a kind of production method of the steel plate HTNM400 with low-welding crack-sensitive energy, it is characterised in that including following step
Suddenly：
1）It smelts：Impurity component in molten steel is mingled with etc. including S, P and each type oxide and is easily generated in the process of setting of molten steel
Serious segregation, mechanical performance and metallurgical quality to special heavy plate face can generate large effect, and preferable internal soundness obtains
, and level-one non-destructive testing standard is ensured compliance with, the smelting of clean steel is basic, is mainly ensured in terms of two, first, in molten steel
Total rank of non-metallic inclusion must be within 4.0, second is that strictly controlling the content of five big harmful elements in molten steel；Outside LF stoves
Refining has fine tuning ingredient, argon gas stirring, foam slag burialing arc heating, reducing atmosphere white slag etc., and VD arrives at a station 1668 DEG C, takes out 5min in advance
To vacuum, pressurize 20min breaks sky, after soft blow 5min 1586 DEG C it is leaving from station, determine hydrogen 0.79ppm and comply with standard；It is required that in the true of 67Pa
Under reciprocal of duty cycle, the dwell time >=20min, while pressure maintaining period molten steel is required to seethe and is worked well；VD temperature leaving from station:1570~1575
℃；
2）Heating rolling：Heating process ensures abundant solid solution of the micro alloying element in austenitic area, takes the big pressure of high temperature low speed
Lower technique fully crushes the dendrite in steel ingot, and deformation extent is bigger, and forming core area driving force, density are bigger, brilliant after recrystallizing repeatedly
Grain just becomes more tiny, but is rolled in the operation of rolling using " the big pressure of high temperature low speed " mode, to the ability of milling train in itself
It is more demanding, it if since mill capacity is small, cannot realize " big pressure ", so as to which roll-force cannot infiltrate into center portion, easily lead
The nonuniform organization on steel plate thickness direction is caused, and cannot play the role of " pressing " steel ingot cast inside residual defect, directly
The impact flexibility of finished steel plate and flaw detection quality are affected, use " the big pressure of high temperature low speed " therefore and beats high pressure in preceding 3 passage
Water hardening surface, permeates roll-force, and to reduce surface second iron sheet growing amount, open cold collector in 5 ~ 8 groups carry out 2 times it is cold
But, slow cooling, cold temperature >=450 DEG C of heap, heap cool time >=4 day, to ensure internal soundness are then carried out；
3）Heat treatment：Any Heat-Treatment of Steel is based on heating, keep the temperature, cool down, and in most of heat treatment process
In, the formation of austenite and the size of austenite grain, the transformation feature of austenite and transformation production during to then controlling cooling
The tissue and performance of object all have a significant effect；Austenitic formation follows the universal law of phase transformation in heating process, that is, includes shape
Core and the basic process grown up are grown up the stage at each temperature there are one corresponding crystal grain, when crystal grain reaches certain size
Afterwards, trend of growing up can gradually weaken；Firing rate is bigger, and austenite nucleation rate is bigger, when austenite stops in insulating process
Between it is shorter, crystal grain is thinner；Coarse austenite grain can form coarse cooling transformation product, so as to deteriorate the room temperature mechanical property of steel
Can, especially impact property, therefore HTNM400 take heat treatment firing rate when, under equipment maximum heating capabilities might, with
Prestissimo heats up, and keeps its higher degree of superheat, and controls holding temperature and soaking time, to ensure its crystal grain refinement journey
Degree, the specific austenitizing temperature for using 930 DEG C carry out CCT curve to HTNM400 using analogue and simulate,
Shown, when being cooled to low temperature with the speed of 0.2 DEG C/s, to be organized as ferrite/pearlite by analog reslt；With 0.2
When the speed of 3 DEG C/s of ＜ V ＜ is cooled to low temperature, ferrite/pearlite+bainite is organized as；With the speed of 3 11 DEG C/s of ＜ V ＜
When degree is cooled to low temperature, pearlite+bainite+martensite is organized as；It is obtained to be organized as 11 DEG C/s of cooling velocity ＞
Single martensite, therefore roller press type quenching is carried out using rolled quenching machine, it both ensure that the plate shape of steel plate, and had utilization >=11
DEG C/cooling velocity of s obtains single martensitic structure, to ensure tissue still stable under the hardness of steel plate and high temperature, from
And obtain the present invention.
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| CN108817102A (en) * | 2018-06-08 | 2018-11-16 | 苏州大学 | A kind of regulation method of slab central circular defect pressing |
| CN109536833A (en) * | 2018-12-05 | 2019-03-29 | 南阳汉冶特钢有限公司 | A kind of high duty alloy tool steel 42CrMo4 hardened and tempered steel plate and its production method |
| CN111378895A (en) * | 2018-12-28 | 2020-07-07 | 宝山钢铁股份有限公司 | Gradient steel material with high-plasticity surface layer and high-strength inner layer and manufacturing method thereof |
| CN111378894A (en) * | 2018-12-28 | 2020-07-07 | 宝山钢铁股份有限公司 | Gradient steel material with surface layer ferrite and inner layer ferrite plus pearlite and manufacturing method |
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| CN115181891A (en) * | 2021-04-02 | 2022-10-14 | 宝山钢铁股份有限公司 | 980 MPa-level low-carbon low-alloy hot-dip galvanized dual-phase steel and rapid heat treatment hot-dip galvanizing manufacturing method |
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| CN111378894A (en) * | 2018-12-28 | 2020-07-07 | 宝山钢铁股份有限公司 | Gradient steel material with surface layer ferrite and inner layer ferrite plus pearlite and manufacturing method |
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| EP3885461A4 (en) * | 2018-12-28 | 2021-12-01 | Baoshan Iron & Steel Co., Ltd. | Gradient steel material having surface layer with ferrite and inner layer with ferrite + pearlite and manufacturing method |
| JP2022513499A (en) * | 2018-12-28 | 2022-02-08 | バオシャン アイアン アンド スティール カンパニー リミテッド | Gradient steel material having a ferrite surface layer and a ferrite + pearlite inner layer and its manufacturing method |
| JP7239704B2 (en) | 2018-12-28 | 2023-03-14 | バオシャン アイアン アンド スティール カンパニー リミテッド | Gradient steel material having ferrite surface layer and ferrite + pearlite inner layer, and method for producing the same |
| CN112501418A (en) * | 2020-11-16 | 2021-03-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel rail for heavy haul railway and preparation method thereof |
| CN115181891A (en) * | 2021-04-02 | 2022-10-14 | 宝山钢铁股份有限公司 | 980 MPa-level low-carbon low-alloy hot-dip galvanized dual-phase steel and rapid heat treatment hot-dip galvanizing manufacturing method |
| CN115181891B (en) * | 2021-04-02 | 2023-07-11 | 宝山钢铁股份有限公司 | 980 MPa-level low-carbon low-alloy hot dip galvanized dual-phase steel and rapid heat treatment hot dip galvanizing manufacturing method |
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