CN105568173B - A kind of high-obdurability low-alloy heat resisting steel and its manufacture method - Google Patents
A kind of high-obdurability low-alloy heat resisting steel and its manufacture method Download PDFInfo
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Abstract
The invention discloses a kind of high-obdurability low-alloy heat resisting steel, it includes the following component of percentage：C0.40~0.50%；Si0.15~0.35%；Mn0.40~0.70%；Cr0.80~1.10%；Ni0.80~1.00%；Mo0.45~0.65%；W0.80~1.00%；V0.25~0.35%；Nb0.015~0.08%；N≤0.002%；O≤0.0015%；Surplus is Fe and impurity.The preparation method of the steel is：Vacuum induction melting, pour injecting electrode, consumable electrode vacuum furnace remelting, forging become a useful person and be heat-treated.It is not very high shortcoming that steel of the present invention, which overcomes existing Mayari obdurability when middle low temperature is used, to meet the long-life and high reliability request of low-pressure shaft and fastener under middle cryogenic conditions.
Description
Technical field
The invention belongs to field of alloy steel, a kind of high-obdurability low-alloy heat resisting steel and its manufacture method are related generally to.
Background technology
Low-pressure shaft and fastener in aero-engine are the critical components in whole engine, and its operating temperature is general
Below 400 DEG C, the effect of main transmission moment of torsion and guarantee low pressure rotor with one heart.It is therefore desirable to which material has under middle low temperature
There are high intensity (room temperature tensile intensity Rm >=1120MPa, 380 DEG C of tensile strength Rm >=950MPa), high toughness (room temperature impact
Toughness KV2 >=60J) etc. combination property, to meet long-life and the high reliability request of low-pressure shaft and fastener.
Wide CrMoV series heat-resistant steels are applied at present, and phosphorus content is typically below 0.30%, although more than 500 DEG C
The creep rupture strength of high temperature very well, but may not necessarily meet the tensile strength used in middle low temperature and toughness reguirements, under arms mistake
Ductile fracture and brittle break are likely to occur in journey.For the obdurability of low-temperature space in improving, the present invention proposes a kind of height
High-toughness low-alloy heat resisting steel.By composition design, double vacuum melting techniques and forging technology research are developed full
Foot is in 400 DEG C of aero-engine used below high-intensity high-tenacity Mayaris.
Chinese patent CN1286317 discloses a kind of high strength low-alloy heat resistant steel with excellent welding performance, the steel
Containing higher Cr, W element, the member such as V, Nb, Ti, B is with the addition of again usually improves the obdurability and reduction Thermal cracking tendency of alloy.
Chinese patent CN1209464 discloses a kind of compared with low-temperature space tensile strength and toughness and the creep in high-temperature region
The all good high-toughness thermo-resisting steel of fracture strength.The steel contains 8-14%Cr, there is higher inoxidizability and corrosion resistance.Again addition compared with
Many Mo, W etc. further strengthen, and 1.5-5.0%Ni is also added in order to improve toughness, to reach the best fit of obdurability,
The elements such as V, Nb are with the addition of again, and the maximum pulling strength of the steel reaches 1100MPa.
Japanese Patent Laid-Open 3-87332 discloses a kind of high strength low-alloy heat resistant steel.The welding heat affected region of the steel
Softening degree it is small, shock resistance is good, can be used at a temperature of a maximum of about of 600 DEG C, at 600 DEG C, 10000h is most
High creep strength is up to 127MPa.
Japanese Patent Laid-Open 4-268040 discloses a kind of Mayari with excellent creep strength and toughness.
The steel contains of a relatively high Cr, W element, without Mo elements, if it is necessary, the also member such as addition La, Ce, Y, Ca, Zr, Ta, Mg
Element, its room temperature tensile intensity is only up to 710MPa.
It is resistance to that Japanese Patent Laid-Open 5-345949 discloses a kind of low Cr ferrites with excellent toughness and creep strength
Hot steel, the steel contains more Cr, Mo, elements such as w, with high creep strength, in order to improve welding toughness, adds Ti etc.,
In order to improve inoxidizability and corrosion resistance, Cu is added, in order to further improve intensity, the elements such as V, Nb are added again.
Above-mentioned patent and steel of the present invention it is maximum distinguish be its carbon content below 0.30%, therefore, in order to obtain one
Fixed intensity, only increases Cr, Mo, the content of elements such as w in steel.The present invention is reduced by properly increasing the carbon content in steel
The content of Cr, Mo, elements such as w in steel, and the elements such as appropriate Ni, V, Nb are added, to reach the best fit of obdurability.
The content of the invention
The purpose of the present invention is a kind of high strength low-alloy heat resistant steel of design and its manufacture method.It is molten by using double vacuum
Refining, big forging ratio forming technique, make steel obtain high-purity and excellent combination of strength and toughness.Succeeding in developing for the steel, can meet
The requirement of 400 DEG C of aero-engine used below high-intensity high-tenacity heat resisting steel.
For achieving the above object, the technical solution adopted in the present invention is as follows：
A kind of high-obdurability low-alloy heat resisting steel, it includes the following component of percentage：
C：0.40~0.50%；
Si：0.15~0.35%；
Mn：0.40~0.70%；
Cr：0.80~1.10%；
Ni：0.80~1.00%；
Mo：0.45~0.65%；
W：0.80~1.00%；
V：0.25~0.35%；
Nb：0.015~0.08%；
N：≤ 0.002%；
O：≤ 0.0015%；
Surplus is Fe and inevitable impurity, and the total amount of impurity element is less than 0.05wt%.
The reason for steel selection chemical composition ranges of the present invention, is as follows：
C：Carbon has good influence to room temperature and middle cryogenic mechanical performance, heat resistance and relaxation stability of steel etc..
Less than 400 DEG C, the creep limit of steel increases and improved with carbon content.Therefore it is preferred that C content is in 0.40-0.50%.
Si：Si is incorporated in steel as deoxidier, and has good effect to improving inoxidizability.If Si contents in steel
Less than 0.10%, its DeGrain；If Si contents increase to more than 0.40%, a part therein can form oxide residual
In steel, reduce toughness.It is preferred that Si contents are 0.15~0.35%.
Mn：Manganese can dissolve in solid solution and play invigoration effect, the room temperature strength and hardness of matrix be improved, in addition, in certain temperature
In the range of can also increase the heat resistance of steel.Manganese can make distortion of lattice and increase lattice atoms key gravitation strongly, below 450 DEG C
When manganese can improve the heat resistance of steel.It is preferred that Mn contents 0.40~0.70%.
Cr：It is the antioxygenic property and corrosion-resistant energy for improving steel that chromium main purpose is added in Mayari
Power, in addition chromium creep rupture strength and the creep limit of steel, and red brittleness, quenching degree to steel can also be improved in certain content range
Had a certain impact with processing performance.Add after 0.5~1.5%Cr, not only improve anti-oxidant in 0.5%Mo or so steel
Ability, and the heat resistance of steel is significantly improved, while the graphitization of steel can be prevented to be inclined to.When Cr amounts continue to increase, the heat of steel is strong
Property is reduced on the contrary.It is preferred that Cr contents are 0.8~1.10%.
Ni：Ni addition can improve the quenching degree and toughness of steel, may also suppress the precipitation of delta ferrite, it is ensured that tissue stabilization
Property.But being excessively added for Ni will cause heat resistance to reduce.It is preferred that Ni contents are 0.80~1.00%.
Mo：Mo can improve the heat resistance of steel, and can significantly reduce the hot-short tendency of steel.Mo improves the main cause of heat resistance
It is to add in notable Intensive intervention body, steel that solid solution lattice distortion and lattice atoms key gravitation can be increased after Mo, and can improves
Recrystallization temperature, makes matrix be strengthened.In addition, with the increase of Mo contents, isothermal transformation C curve is moved to right, and starts to turn at nose
Temperature is moved up, so as to inhibit perlitic transformation, promotes bainite transformation, and this is also beneficial to the raising of heat resistance.Work as Mo
When content is below 0.40%, DeGrain, and be excessively added so that toughness is reduced after being used for a long time.Added in steel strong
During carbide former V, Nb, Ti, then Mo strengthens because the effect of solution is more notable.Because strong carbide is formed
Element is combined into stable carbide with carbon, promotes Mo more effectively can dissolve in solid solution, so that the heat for being more beneficial for steel is strong
Property improve.It is preferred that Mo contents are 0.45~0.65%.
W：W is also to increase heat resistance and the creep of steel by Intensive intervention body and promotion bainite transformation as Mo
Drag, but W and Mo compound addition to improving W or Mo of the effect of steel heat resistance and creep resistance than being individually added into equivalent work
With more notable.In order to reach the effect above, W minimum content should be more than 0.80%, but its content is more than more than 1.00%
When, can make the toughness of steel reduces.It is preferred that W content is 0.80~1.00%.
V：V is the strong element for forming carbide, and is distributed on matrix in uniform small and dispersed.Adding vanadium in steel can be thin
Change crystal grain, significantly increase the yield limit of steel.In addition, after V fixes C, promoting Cr, Mo, W to dissolve in solid solution, make these yuan
Plain effectively Intensive intervention body, is conducive to the heat resistance of steel and the raising of relaxation stability.V content is less than 0.20%, this effect
Fruit is not obvious, when content is more than 0.40%, easily generates delta ferrite.It is preferred that V content is 0.25~0.35%.
Nb：Nb is carbide, and the carbide of niobium is extremely stablized in high temperature, and is uniformly distributed in fine particle
Precipitation enhancement is played in matrix.Solid solution Nb dramatically increases lattice atoms and is good for gravitation and distortion of lattice in steel, improves recrystallization temperature
Degree, Intensive intervention body.Nb promotes W, Mo element to enter the indirect invigoration effect of solid solution after being combined with C.Therefore, added in steel
A small amount of Nb, its effect when good influence, particularly V are combined addition with Nb is produced on creep limit and creep rupture strength and is become apparent from.
If but Nb amounts be less than 0.01% when, its DeGrain；And if during more than 0.1%, Nb is separated out with big particle, causing toughness to drop
It is low.It is preferred that Nb contents are 0.015~0.08%.
N、O：N, O content are lower in steel, and field trash is fewer, and plasticity and toughness are better.Therefore, N, O in present invention control steel
Content makes N≤0.002%, O≤0.0015% in a relatively low scope.
A kind of preparation method of high-obdurability low-alloy heat resisting steel as described in the present invention, it comprises the following steps：
Injecting electrode, consumable electrode vacuum furnace remelting are poured after vacuum induction melting, is forged and is become a useful person and be heat-treated.
Preferably, the vacuum induction melting step includes following operation：
First carbon is fitted into crucible, then by pure iron, W metal, metal Mo, metal W, metal Cr, metal V, metal Nb, knot
Brilliant Si loads crucible, and preheating is carried out to crucible to electricity with the power of rated power 30~40% makes raw material start fusing, and by earthenware
The vacuum of crucible is evacuated to≤2.7Pa after, make raw material continue to melt by the 40~65% of power ascension to rated power, treat raw material
All it is fused into after molten steel, by more than the 90% of power ascension to rated power, keeps 8~12min, improve the temperature of the molten steel
Spend to after 1570~1590 DEG C, the 30~40% of reduction power to rated power, which carries out insulation refinings, is not less than 60min, and insulation is smart
After refining terminates, it is filled with into crucible after inert gas to 6000Pa pressure, adds metal Mn, improves power to rated power
After more than 90% melts metal Mn, analysis is sampled, is tapped after composition is qualified and pours into electrode.
Preferably, the consumable electrode vacuum furnace reflow step includes following operation：
The one end of electrode with shrinkage cavity is subjected to remelting down, it is 2.5~3.0kg/min to control molten speed, keeps the limit true
Below reciprocal of duty cycle 0.1Pa, obtains steel ingot.
Preferably, the forging becomes a useful person step including operating as follows：
By Heating Steel Ingots to 1170~1190 DEG C, after 3~6h of insulation, by the 50~55% of steel ingot jumping-up to raw footage, so
After melt down and be heated to 1130~1150 DEG C, pulled out after 60~80min of insulation, starting forging temperature temperature >=1110 that control is pulled out
DEG C, stop forging temperature >=850 DEG C, last fire time pulling deflection >=35%.
Preferably, the technical parameter of the heat treatment step is：
930~950 DEG C of normalizing, is incubated 1~3h, air cooling；Once it is tempered 580~600 DEG C of 5~7h of insulation, air cooling；Secondary returning
580~600 DEG C of 3~5h of insulation of fire, air cooling.
Preferably, in the insulation refining process, sampling analysis is after after N≤30ppm, and addition alloy material is carried out into
Divide fine setting.
High-purity can be obtained by above-mentioned technology controlling and process, fine microstructures uniformly forge tissue.After final heat treatment, i.e.,
The good fit of high-intensity high-tenacity is can reach, the aviation used under middle low temperature high-performance low-alloy heat resisting steel is fully met
Requirement.
The present invention compared with prior art, with it is prominent the characteristics of and remarkable advantage：
It is not very high shortcoming that steel of the present invention, which overcomes existing Mayari obdurability when middle low temperature is used, is passed through
Optimization composition is improved the obdurability of steel, and the content of O, N in steel are preferably minimized especially by using double vacuum meltings
Level, steel inclusion is significantly reduced, and passes through special forging technology, it is ensured that is obtained the tissue of fine uniform, that is, is reached high-strength
Degree, high tenacity it is good fit, to meet the long-life and high reliability request of low-pressure shaft and fastener under middle cryogenic conditions,
Extensive and urgent application demand prospect is there is in the national defence such as Aero-Space leading-edge field.
Embodiment
With reference to embodiment, the invention will be further described, but protection scope of the present invention is not only limited to implement
Example.
Steel of the present invention is forged in 1 ton of vaccum sensitive stove and consumable electrode vacuum furnace melting through upsetting pull, last thermally treated, you can
Reach the design requirement of aero-engine high-obdurability low-alloy heat resisting steel.
Embodiment 1：The specific composition of the alloy of the present embodiment is as shown in table 2.
1st, 1 ton of vacuum induction melting technique：
Metal Cr, Mn, Ni, Mo, W, Nb, V and pure iron of selected high-purity etc., S, P and Cu content of metal charge are as far as possible low.
All furnace charges must clean drying, and no greasy dirt is rustless.In addition to Mn, alloying component supplying control specification pays special attention to S, P, Cu
Bring into, C is by 0.48% supplying, and metal Mn is all reserved to be added after N is qualified.First 100kW small-powers are to material in electric preheating crucible
Material, is vacuumized until vacuum reaches below 2.7Pa.Reach whne vacuum≤2.7Pa when, power is risen into 180kW and started slowly
Fast thawing.After fine melt liquid level holding calmness is fine melt there is no bubble spilling, power is risen into 280kW, 8min is kept, works as temperature
Degree, which is risen to after 1570 DEG C, drops power to 120kW insulation refinings, and refining time wants >=60min.Complete analysis is sampled after after N≤30ppm,
Add alloy material and carry out trimming, give higher-wattage 280kW fusings.After being stirred sampling analysis, Ran Houchong after fine melt
Ar6000Pa adds Mn, treats that contents temperature powered can properly be tapped.Ф 290mm electrodes are poured into a mould, it is red after the electrode demoulding to send annealing.
2nd, 1 ton of consumable electrode vacuum furnace smelting process：
By electrode cutting tack, the necessary thorough cleaning of electrode is clean, must not there is rust, oil and foul.One end with shrinkage cavity
Consumable remelting is carried out down, selects Ф 360mm crystallizers.Refined using 2.7kg/min eutectics fast thawing, control electric current 4000~
5000A, 21~25V of voltage, keep final vacuum≤0.1Pa.Melting, which is finished, takes off that ingot is red send annealing after 60min.Annealing temperature
For 680~730 DEG C, 12-16 hours are incubated, air cooling of coming out of the stove then is furnace-cooled to after≤500 DEG C.
3rd, forging technology：
Steel ingot is come out of the stove after 3 hours forging in 1190 DEG C of heating and thermal insulations, and in forging process, once, jumping-up is extremely for steel ingot jumping-up
The 50% of former height, to increase forging ratio.Steel ingot melts down 1150 DEG C of relation reheating temperature, is incubated 60 minutes, starting forging temperature >=1110
DEG C, stop forging temperature >=850 DEG C.It is 35% to control last fire time deflection.It is red after forging to send annealing, 670 ± 10 DEG C of annealing temperature,
Insulation 15~20 hours.Then air cooling of coming out of the stove is furnace-cooled to after≤500 DEG C.
4th, Technology for Heating Processing
The steel is through 940 DEG C of insulation 1.5h of normalizing, air cooling；Once it is tempered 590 DEG C of insulation 6h, air cooling；590 DEG C of guarantors of double tempering
Warm 4h, air cooling.
Embodiment 2：The specific composition of the alloy of the present embodiment is as shown in table 2.
1st, 1 ton of vacuum induction melting technique：
Metal Cr, Mn, Ni, Mo, W, Nb, V and pure iron of selected high-purity etc., S, P and Cu content of metal charge are as far as possible low.
All furnace charges must clean drying, and no greasy dirt is rustless.In addition to Mn, alloying component supplying control specification pays special attention to S, P, Cu
Bring into, C is by 0.50% supplying, and metal Mn is all reserved to be added after N is qualified.First 90KW small-powers are to material in electric preheating crucible
Material, is vacuumized until vacuum reaches below 2.7Pa.Reach whne vacuum≤2.7Pa when, power is risen into 150kW and started slowly
Fast thawing.After fine melt liquid level holding calmness is fine melt there is no bubble spilling, power is risen into 275kW, 12min is kept, when
Temperature, which is risen to after 1590 DEG C, drops power to 110kW insulation refinings, and refining time wants >=60min.N≤30ppm is treated in sampling complete analysis
Afterwards, add alloy material and carry out trimming, give higher-wattage 275kW fusings.After being stirred sampling analysis, Ran Houchong after fine melt
Ar6000Pa adds Mn, treats that contents temperature powered can properly be tapped.Ф 290mm electrodes are poured into a mould, it is red after the electrode demoulding to send annealing.
2nd, 1 ton of consumable electrode vacuum furnace smelting process：
By electrode cutting tack, the necessary thorough cleaning of electrode is clean, must not there is rust, oil and foul.One end with shrinkage cavity
Consumable remelting is carried out down, selects Ф 360mm crystallizers.Refined using 2.5kg/min eutectics fast thawing, control electric current 4000~
5000A, 21~25V of voltage, keep final vacuum≤0.1Pa.Melting, which is finished, takes off that ingot is red send annealing after 60min.Annealing temperature
For 680-730 DEG C, 12-16 hours are incubated, air cooling of coming out of the stove then is furnace-cooled to after≤500 DEG C.
3rd, forging technology：
Steel ingot is come out of the stove after 4 hours forging in 1170 DEG C of heating and thermal insulations, and in forging process, once, jumping-up is extremely for steel ingot jumping-up
The 55% of former height, to increase forging ratio.Steel ingot melts down 1140 DEG C of relation reheating temperature, is incubated 70 minutes, starting forging temperature >=1110
DEG C, stop forging temperature >=850 DEG C.It is 40% to control last fire time deflection.It is red after forging to send annealing, 670 ± 10 DEG C of annealing temperature,
Insulation 15~20 hours.Then air cooling of coming out of the stove is furnace-cooled to after≤500 DEG C.
4th, Technology for Heating Processing
The steel is through 930 DEG C of insulation 2h of normalizing, air cooling；Once it is tempered 580 DEG C of insulation 7h, air cooling；580 DEG C of insulations of double tempering
5h, air cooling.
The specific composition of alloy is as shown in table 2.
Embodiment 3：The specific composition of the alloy of the present embodiment is as shown in table 2.
1st, 1 ton of vacuum induction melting technique：
Metal Cr, Mn, Ni, Mo, W, Nb, V and pure iron of selected high-purity etc., S, P and Cu content of metal charge are as far as possible low.
All furnace charges must clean drying, and no greasy dirt is rustless.In addition to Mn, alloying component supplying control specification pays special attention to S, P, Cu
Bring into, C is by 0.49% supplying, and metal Mn is all reserved to be added after N is qualified.First 110KW small-powers are to material in electric preheating crucible
Material, is vacuumized until vacuum reaches below 2.7Pa.Reach whne vacuum≤2.7Pa when, power is risen into 195kW and started slowly
Fast thawing.After fine melt liquid level holding calmness is fine melt there is no bubble spilling, power is risen into 280kW, 11min is kept, when
Temperature, which is risen to after 1580 DEG C, drops power to 110kW insulation refinings, and refining time wants >=60min.N≤30ppm is treated in sampling complete analysis
Afterwards, add alloy material and carry out trimming, give higher-wattage 290kW fusings.After being stirred sampling analysis, Ran Houchong after fine melt
Ar6000Pa adds Mn, treats that contents temperature powered can properly be tapped.Ф 290mm electrodes are poured into a mould, it is red after the electrode demoulding to send annealing.
2nd, 1 ton of consumable electrode vacuum furnace smelting process：
By electrode cutting tack, the necessary thorough cleaning of electrode is clean, must not there is rust, oil and foul.One end with shrinkage cavity
Consumable remelting is carried out down, selects Ф 360mm crystallizers.Refined using 2.6kg/min eutectics fast thawing, control electric current 4000~
5000A, 21~25V of voltage, keep final vacuum≤0.1Pa.Melting, which is finished, takes off that ingot is red send annealing after 60min.Annealing temperature
For 680~730 DEG C, 12~16 hours are incubated, air cooling of coming out of the stove then is furnace-cooled to after≤500 DEG C.
3rd, forging technology：
Steel ingot is come out of the stove after 4 hours forging in 1180 DEG C of heating and thermal insulations, and in forging process, once, jumping-up is extremely for steel ingot jumping-up
The 50% of former height, to increase forging ratio.Steel ingot melts down 1140 DEG C of relation reheating temperature, is incubated 70 minutes, starting forging temperature >=1110
DEG C, stop forging temperature >=850 DEG C.It is 36% to control last fire time deflection.It is red after forging to send annealing, 670 ± 10 DEG C of annealing temperature,
Insulation 15~20 hours.Then air cooling of coming out of the stove is furnace-cooled to after≤500 DEG C.
4th, Technology for Heating Processing
The steel is through 950 DEG C of insulation 1h of normalizing, air cooling；Once it is tempered 600 DEG C of insulation 5h, air cooling；600 DEG C of insulations of double tempering
5h, air cooling.
Embodiment 4：The specific composition of the alloy of the present embodiment is as shown in table 2.
1st, 1 ton of vacuum induction melting technique：
Metal Cr, Mn, Ni, Mo, W, Nb, V and pure iron of selected high-purity etc., S, P and Cu content of metal charge are as far as possible low.
All furnace charges must clean drying, and no greasy dirt is rustless.In addition to Mn, alloying component supplying control specification pays special attention to S, P, Cu
Bring into, C is by 0.50% supplying, and metal Mn is all reserved to be added after N is qualified.First 120KW small-powers are to material in electric preheating crucible
Material, is vacuumized until vacuum reaches below 2.7Pa.Reach whne vacuum≤2.7Pa when, power is risen into 195kW and started slowly
Fast thawing.After fine melt liquid level holding calmness is fine melt there is no bubble spilling, power is risen into 300kW, 10min is kept, when
Temperature, which is risen to after 1580 DEG C, drops power to 120kW insulation refinings, and refining time wants >=60min.N≤30ppm is treated in sampling complete analysis
Afterwards, add alloy material and carry out trimming, give higher-wattage 300kW fusings.After being stirred sampling analysis, Ran Houchong after fine melt
Ar6000Pa adds Mn, treats that contents temperature powered can properly be tapped.Ф 290mm electrodes are poured into a mould, it is red after the electrode demoulding to send annealing.
2nd, 1 ton of consumable electrode vacuum furnace smelting process：
By electrode cutting tack, the necessary thorough cleaning of electrode is clean, must not there is rust, oil and foul.One end with shrinkage cavity
Consumable remelting is carried out down, selects Ф 360mm crystallizers.Refined using 3.0kg/min eutectics fast thawing, control electric current 4000~
5000A, 21~25V of voltage, keep final vacuum≤0.1Pa.Melting, which is finished, takes off that ingot is red send annealing after 60min.Annealing temperature
For 680-730 DEG C, 12~16 hours are incubated, air cooling of coming out of the stove then is furnace-cooled to after≤500 DEG C.
3rd, forging technology：
Steel ingot is come out of the stove after 4 hours forging in 1180 DEG C of heating and thermal insulations, and in forging process, once, jumping-up is extremely for steel ingot jumping-up
The 52% of former height, to increase forging ratio.Steel ingot melts down 1140 DEG C of relation reheating temperature, is incubated 80 minutes, starting forging temperature >=1110
DEG C, stop forging temperature >=850 DEG C.It is 38% to control last fire time deflection.It is red after forging to send annealing, 670 ± 10 DEG C of annealing temperature,
Insulation 15-20 hours.Then air cooling of coming out of the stove is furnace-cooled to after≤500 DEG C.
4th, Technology for Heating Processing
The steel is through 930 DEG C of insulation 3h of normalizing, air cooling；Once it is tempered 590 DEG C of insulation 6h, air cooling；590 DEG C of insulations of double tempering
4h, air cooling.
Chemical composition and production method designed according to this invention produces 10 stove alloys, the specific composition such as table of alloy
Shown in 2.It is controlled by above-mentioned technique, the macrostructure of invention steel is in good condition, and inclusion content is considerably less, and even tissue is thin
Small, its degree of purity is very high, and its macrostructure, grain size and the examination of nonmetallic inclusion are as shown in table 3.10 stove alloys are carried out
Sampling, after heat treatment carries out mechanical property test, its result is as shown in table 4.The room temperature tensile intensity of invention steel is reachable
More than 1120MPa, 380 DEG C of tensile strength are up to more than 950MPa, and room temperature impact toughness is up to more than 60J, and its mechanical property is complete
Design requirement is reached entirely.
Embodiment 5：The specific composition of the alloy of the present embodiment is as shown in table 2.
1st, 1 ton of vacuum induction melting technique：
Metal Cr, Mn, Ni, Mo, W, Nb, V and pure iron of selected high-purity etc., S, P and Cu content of metal charge are as far as possible low.
All furnace charges must clean drying, and no greasy dirt is rustless.In addition to Mn, alloying component supplying control specification pays special attention to S, P, Cu
Bring into, C is by 0.48% supplying, and metal Mn is all reserved to be added after N is qualified.First 110KW small-powers are to material in electric preheating crucible
Material, is vacuumized until vacuum reaches below 2.7Pa.Reach whne vacuum≤2.7Pa when, power is risen into 150kW and started slowly
Fast thawing.After fine melt liquid level holding calmness is fine melt there is no bubble spilling, power is risen into 290kW, 12min is kept, when
Temperature, which is risen to after 1590 DEG C, drops power to 110kW insulation refinings, and refining time wants >=60min.N≤30ppm is treated in sampling complete analysis
Afterwards, add alloy material and carry out trimming, give higher-wattage 290kW fusings.After being stirred sampling analysis, Ran Houchong after fine melt
Ar6000Pa adds Mn, treats that contents temperature powered can properly be tapped.Ф 290mm electrodes are poured into a mould, it is red after the electrode demoulding to send annealing.
2nd, 1 ton of consumable electrode vacuum furnace smelting process：
By electrode cutting tack, the necessary thorough cleaning of electrode is clean, must not there is rust, oil and foul.One end with shrinkage cavity
Consumable remelting is carried out down, selects Ф 360mm crystallizers.Refined using 2.9kg/min eutectics fast thawing, control electric current 4000~
5000A, 21~25V of voltage, keep final vacuum≤0.1Pa.Melting, which is finished, takes off that ingot is red send annealing after 60min.Annealing temperature
For 680-730 DEG C, 12-16 hours are incubated, air cooling of coming out of the stove then is furnace-cooled to after≤500 DEG C.
3rd, forging technology：
Steel ingot is come out of the stove after 6 hours forging in 1190 DEG C of heating and thermal insulations, and in forging process, once, jumping-up is extremely for steel ingot jumping-up
The 50% of former height, to increase forging ratio.Steel ingot melts down 1130 DEG C of relation reheating temperature, is incubated 80 minutes, starting forging temperature >=1110
DEG C, stop forging temperature >=850 DEG C.It is 40% to control last fire time deflection.It is red after forging to send annealing, 670 ± 10 DEG C of annealing temperature,
Insulation 15~20 hours.Then air cooling of coming out of the stove is furnace-cooled to after≤500 DEG C.
4th, Technology for Heating Processing
The steel is through 950 DEG C of insulation 1.5h of normalizing, air cooling；Once it is tempered 590 DEG C of insulation 5h, air cooling；590 DEG C of guarantors of double tempering
Warm 3h, air cooling.
Embodiment 6：The specific composition of the alloy of the present embodiment is as shown in table 2.
1st, 1 ton of vacuum induction melting technique：
Metal Cr, Mn, Ni, Mo, W, Nb, V and pure iron of selected high-purity etc., S, P and Cu content of metal charge are as far as possible low.
All furnace charges must clean drying, and no greasy dirt is rustless.In addition to Mn, alloying component supplying control specification pays special attention to S, P, Cu
Bring into, C is by 0.49% supplying, and metal Mn is all reserved to be added after N is qualified.First 90KW small-powers are to material in electric preheating crucible
Material, is vacuumized until vacuum reaches below 2.7Pa.Reach whne vacuum≤2.7Pa when, power is risen into 170kW and started slowly
Fast thawing.After fine melt liquid level holding calmness is fine melt there is no bubble spilling, power is risen into 280kW, 12min is kept, when
Temperature, which is risen to after 1590 DEG C, drops power to 120kW insulation refinings, and refining time wants >=60min.N≤30ppm is treated in sampling complete analysis
Afterwards, add alloy material and carry out trimming, give higher-wattage 290kW fusings.After being stirred sampling analysis, Ran Houchong after fine melt
Ar6000Pa adds Mn, treats that contents temperature powered can properly be tapped.Ф 290mm electrodes are poured into a mould, it is red after the electrode demoulding to send annealing.
2nd, 1 ton of consumable electrode vacuum furnace smelting process：
By electrode cutting tack, the necessary thorough cleaning of electrode is clean, must not there is rust, oil and foul.One end with shrinkage cavity
Consumable remelting is carried out down, selects Ф 360mm crystallizers.Refined using 2.6kg/min eutectics fast thawing, control electric current 4000~
5000A, 21~25V of voltage, keep final vacuum≤0.1Pa.Melting, which is finished, takes off that ingot is red send annealing after 60min.Annealing temperature
For 680-730 DEG C, 12~16 hours are incubated, air cooling of coming out of the stove then is furnace-cooled to after≤500 DEG C.
3rd, forging technology：
Steel ingot is come out of the stove after 4 hours forging in 1180 DEG C of heating and thermal insulations, and in forging process, once, jumping-up is extremely for steel ingot jumping-up
The 54% of former height, to increase forging ratio.Steel ingot melts down 1140 DEG C of relation reheating temperature, is incubated 70 minutes, starting forging temperature >=1110
DEG C, stop forging temperature >=850 DEG C.It is 40% to control last fire time deflection.It is red after forging to send annealing, 670 ± 10 DEG C of annealing temperature,
Insulation 15~20 hours.Then air cooling of coming out of the stove is furnace-cooled to after≤500 DEG C.
4th, Technology for Heating Processing
The steel is through 930 DEG C of insulation 2h of normalizing, air cooling；Once it is tempered 590 DEG C of insulation 6h, air cooling；590 DEG C of insulations of double tempering
4h, air cooling.
Embodiment 7：The specific composition of the alloy of the present embodiment is as shown in table 2.
1st, 1 ton of vacuum induction melting technique：
Metal Cr, Mn, Ni, Mo, W, Nb, V and pure iron of selected high-purity etc., S, P and Cu content of metal charge are as far as possible low.
All furnace charges must clean drying, and no greasy dirt is rustless.In addition to Mn, alloying component supplying control specification pays special attention to S, P, Cu
Bring into, C is by 0.50% supplying, and metal Mn is all reserved to be added after N is qualified.First 90KW small-powers are to material in electric preheating crucible
Material, is vacuumized until vacuum reaches below 2.7Pa.Reach whne vacuum≤2.7Pa when, power is risen into 170kW and started slowly
Fast thawing.After fine melt liquid level holding calmness is fine melt there is no bubble spilling, power is risen into 300kW, 9min is kept, works as temperature
Degree, which is risen to after 1580 DEG C, drops power to 90kW insulation refinings, and refining time wants >=60min.Complete analysis is sampled after after N≤30ppm,
Add alloy material and carry out trimming, give higher-wattage 300kW fusings.After being stirred sampling analysis, Ran Houchong after fine melt
Ar6000Pa adds Mn, treats that contents temperature powered can properly be tapped.Ф 290mm electrodes are poured into a mould, it is red after the electrode demoulding to send annealing.
2nd, 1 ton of consumable electrode vacuum furnace smelting process：
By electrode cutting tack, the necessary thorough cleaning of electrode is clean, must not there is rust, oil and foul.One end with shrinkage cavity
Consumable remelting is carried out down, selects Ф 360mm crystallizers.Refined using 2.8kg/min eutectics fast thawing, control electric current 4000~
5000A, 21~25V of voltage, keep final vacuum≤0.1Pa.Melting, which is finished, takes off that ingot is red send annealing after 60min.Annealing temperature
For 680~730 DEG C, 12~16 hours are incubated, air cooling of coming out of the stove then is furnace-cooled to after≤500 DEG C.
3rd, forging technology：
Steel ingot is come out of the stove after 3 hours forging in 1180 DEG C of heating and thermal insulations, and in forging process, once, jumping-up is extremely for steel ingot jumping-up
The 50% of former height, to increase forging ratio.Steel ingot melts down 1140 DEG C of relation reheating temperature, is incubated 70 minutes, starting forging temperature >=1110
DEG C, stop forging temperature >=850 DEG C.It is 36% to control last fire time deflection.It is red after forging to send annealing, annealing temperature 670 ± 10
DEG C, it is incubated 15~20 hours.Then air cooling of coming out of the stove is furnace-cooled to after≤500 DEG C.
4th, Technology for Heating Processing
The steel is through 930 DEG C of insulation 3h of normalizing, air cooling；Once it is tempered 590 DEG C of insulation 5h, air cooling；590 DEG C of insulations of double tempering
3h, air cooling.
Embodiment 8：The specific composition of the alloy of the present embodiment is as shown in table 2.
1st, 1 ton of vacuum induction melting technique：
Metal Cr, Mn, Ni, Mo, W, Nb, V and pure iron of selected high-purity etc., S, P and Cu content of metal charge are as far as possible low.
All furnace charges must clean drying, and no greasy dirt is rustless.In addition to Mn, alloying component supplying control specification pays special attention to S, P, Cu
Bring into, C is by 0.49% supplying, and metal Mn is all reserved to be added after N is qualified.First 100KW small-powers are to material in electric preheating crucible
Material, is vacuumized until vacuum reaches below 2.7Pa.Reach whne vacuum≤2.7Pa when, power is risen into 180kW and started slowly
Fast thawing.After fine melt liquid level holding calmness is fine melt there is no bubble spilling, power is risen into 280kW, 8~12min is kept,
Power is dropped after temperature rises to 1570~1590 DEG C and is incubated refining to 120kW, refining time wants >=60min.N is treated in sampling complete analysis
After≤30ppm, add alloy material and carry out trimming, give higher-wattage 280kW fusings.Divide after being stirred sampling after fine melt
Analysis, then fills Ar6000Pa plus Mn, treats that contents temperature powered can properly be tapped.Ф 290mm electrodes are poured into a mould, it is red after the electrode demoulding
Send annealing.
2nd, 1 ton of consumable electrode vacuum furnace smelting process：
By electrode cutting tack, the necessary thorough cleaning of electrode is clean, must not there is rust, oil and foul.One end with shrinkage cavity
Consumable remelting is carried out down, selects Ф 360mm crystallizers.Refined using 2.9kg/min eutectics fast thawing, control electric current 4000~
5000A, 21~25V of voltage, keep final vacuum≤0.1Pa.Melting, which is finished, takes off that ingot is red send annealing after 60min.Annealing temperature
For 680~730 DEG C, 12~16 hours are incubated, air cooling of coming out of the stove then is furnace-cooled to after≤500 DEG C.
3rd, forging technology：
Steel ingot is come out of the stove after 3 hours forging in 1190 DEG C of heating and thermal insulations, and in forging process, once, jumping-up is extremely for steel ingot jumping-up
The 54% of former height, to increase forging ratio.Steel ingot melts down 1130 DEG C of relation reheating temperature, is incubated 80 minutes, starting forging temperature >=1110
DEG C, stop forging temperature >=850 DEG C.It is 39% to control last fire time deflection.It is red after forging to send annealing, 670 ± 10 DEG C of annealing temperature,
Insulation 15-20 hours.Then air cooling of coming out of the stove is furnace-cooled to after≤500 DEG C.
4th, Technology for Heating Processing
The steel is through 950 DEG C of insulation 1.5h of normalizing, air cooling；Once it is tempered 600 DEG C of insulation 6h, air cooling；600 DEG C of guarantors of double tempering
Warm 4h, air cooling.
Embodiment 9：The specific composition of the alloy of the present embodiment is as shown in table 2.
1st, 1 ton of vacuum induction melting technique：
Metal Cr, Mn, Ni, Mo, W, Nb, V and pure iron of selected high-purity etc., S, P and Cu content of metal charge are as far as possible low.
All furnace charges must clean drying, and no greasy dirt is rustless.In addition to Mn, alloying component supplying control specification pays special attention to S, P, Cu
Bring into, C is by 0.49% supplying, and metal Mn is all reserved to be added after N is qualified.First 100KW small-powers are to material in electric preheating crucible
Material, is vacuumized until vacuum reaches below 2.7Pa.Reach whne vacuum≤2.7Pa when, power is risen into 180kW and started slowly
Fast thawing.After fine melt liquid level holding calmness is fine melt there is no bubble spilling, power is risen into 280kW, 8~12min is kept,
Power is dropped after temperature rises to 1570~1590 DEG C and is incubated refining to 120kW, refining time wants >=60min.N is treated in sampling complete analysis
After≤30ppm, add alloy material and carry out trimming, give higher-wattage 280kW fusings.Divide after being stirred sampling after fine melt
Analysis, then fills Ar6000Pa plus Mn, treats that contents temperature powered can properly be tapped.Ф 290mm electrodes are poured into a mould, it is red after the electrode demoulding
Send annealing.
2nd, 1 ton of consumable electrode vacuum furnace smelting process：
By electrode cutting tack, the necessary thorough cleaning of electrode is clean, must not there is rust, oil and foul.One end with shrinkage cavity
Consumable remelting is carried out down, selects Ф 360mm crystallizers.Refined using 3.0kg/min eutectics fast thawing, control electric current 4000~
5000A, 21~25V of voltage, keep final vacuum≤0.1Pa.Melting, which is finished, takes off that ingot is red send annealing after 60min.Annealing temperature
For 680-730 DEG C, 12-16 hours are incubated, air cooling of coming out of the stove then is furnace-cooled to after≤500 DEG C.
3rd, forging technology：
Steel ingot is come out of the stove after 3 hours forging in 1190 DEG C of heating and thermal insulations, and in forging process, once, jumping-up is extremely for steel ingot jumping-up
The 50% of former height, to increase forging ratio.Steel ingot melts down 1150 DEG C of relation reheating temperature, is incubated 60 minutes, starting forging temperature >=1110
DEG C, stop forging temperature >=850 DEG C.It is 37% to control last fire time deflection.It is red after forging to send annealing, 670 ± 10 DEG C of annealing temperature,
Insulation 15~20 hours.Then air cooling of coming out of the stove is furnace-cooled to after≤500 DEG C.
4th, Technology for Heating Processing
The steel is through 940 DEG C of insulation 3h of normalizing, air cooling；Once it is tempered 580 DEG C of insulation 7h, air cooling；590 DEG C of insulations of double tempering
4h, air cooling.
Embodiment 10：The specific composition of the alloy of the present embodiment is as shown in table 2.
1st, 1 ton of vacuum induction melting technique：
Metal Cr, Mn, Ni, Mo, W, Nb, V and pure iron of selected high-purity etc., S, P and Cu content of metal charge are as far as possible low.
All furnace charges must clean drying, and no greasy dirt is rustless.In addition to Mn, alloying component supplying control specification pays special attention to S, P, Cu
Bring into, C is by 0.50% supplying, and metal Mn is all reserved to be added after N is qualified.First 100KW small-powers are to material in electric preheating crucible
Material, is vacuumized until vacuum reaches below 2.7Pa.Reach whne vacuum≤2.7Pa when, power is risen into 180kW and started slowly
Fast thawing.After fine melt liquid level holding calmness is fine melt there is no bubble spilling, power is risen into 280kW, 9min is kept, works as temperature
Degree, which is risen to after 1590 DEG C, drops power to 120kW insulation refinings, and refining time wants >=60min.Complete analysis is sampled after after N≤30ppm,
Add alloy material and carry out trimming, give higher-wattage 280kW fusings.After being stirred sampling analysis, Ran Houchong after fine melt
Ar6000Pa adds Mn, treats that contents temperature powered can properly be tapped.Ф 290mm electrodes are poured into a mould, it is red after the electrode demoulding to send annealing.
2nd, 1 ton of consumable electrode vacuum furnace smelting process：
By electrode cutting tack, the necessary thorough cleaning of electrode is clean, must not there is rust, oil and foul.One end with shrinkage cavity
Consumable remelting is carried out down, selects Ф 360mm crystallizers.Refined using 2.5kg/min eutectics fast thawing, control electric current 4000~
5000A, 21~25V of voltage, keep final vacuum≤0.1Pa.Melting, which is finished, takes off that ingot is red send annealing after 60min.Annealing temperature
For 680-730 DEG C, 12-16 hours are incubated, air cooling of coming out of the stove then is furnace-cooled to after≤500 DEG C.
3rd, forging technology：
Steel ingot is come out of the stove after 3 hours forging in 1190 DEG C of heating and thermal insulations, and in forging process, once, jumping-up is extremely for steel ingot jumping-up
Former height 55%, to increase forging ratio.Steel ingot melts down 1150 DEG C of relation reheating temperature, is incubated 60 minutes, starting forging temperature >=1110 DEG C,
Stop forging temperature >=850 DEG C.It is 35% to control last fire time deflection.Red after forging to send annealing, 670 ± 10 DEG C of annealing temperature is protected
It is warm 15-20 hours.Then air cooling of coming out of the stove is furnace-cooled to after≤500 DEG C.
4th, Technology for Heating Processing
The steel is through 940 DEG C of insulation 1h of normalizing, air cooling；Once it is tempered 590 DEG C of insulation 5h, air cooling；590 DEG C of insulations of double tempering
3h, air cooling.
It is controlled by above-mentioned technique, the macrostructure of invention steel is in good condition, and inclusion content is considerably less, even tissue
Tiny, its degree of purity is very high, and its macrostructure, grain size and the examination of nonmetallic inclusion are as shown in table 3.10 stove alloys are entered
Row sampling, after heat treatment carries out mechanical property test, its result is as shown in table 4.The room temperature tensile intensity of invention steel is reachable
More than 1120MPa, 380 DEG C of tensile strength are up to more than 950MPa, and room temperature impact toughness is up to more than 60J, and its mechanical property is complete
Design requirement is reached entirely.
The chemical composition of the original patent steel of table 1 and steel of the present invention is contrasted
The chemical composition of the steel of the present invention of table 2, wt%
| Sequence number | C | Si | Mn | Cr | Ni | Mo | W | V | Nb | O | N |
| 1 | 0.42 | 0.25 | 0.54 | 0.86 | 0.83 | 0.48 | 0.91 | 0.30 | 0.02 | 0.0010 | 0.0016 |
| 2 | 0.45 | 0.31 | 0.48 | 0.91 | 0.92 | 0.46 | 0.85 | 0.25 | 0.017 | 0.0011 | 0.0017 |
| 3 | 0.44 | 0.16 | 0.58 | 0.85 | 0.99 | 0.52 | 0.94 | 0.33 | 0.052 | 0.0009 | 0.0018 |
| 4 | 0.48 | 0.32 | 0.68 | 1.06 | 0.91 | 0.55 | 0.82 | 0.32 | 0.07 | 0.0012 | 0.0018 |
| 5 | 0.46 | 0.22 | 0.61 | 0.88 | 0.85 | 0.63 | 0.96 | 0.30 | 0.08 | 0.0012 | 0.0014 |
| 6 | 0.49 | 0.20 | 0.65 | 0.82 | 0.88 | 0.60 | 0.98 | 0.29 | 0.062 | 0.0012 | 0.0015 |
| 7 | 0.44 | 0.29 | 0.45 | 0.87 | 0.88 | 0.61 | 0.85 | 0.30 | 0.025 | 0.0014 | 0.0016 |
| 8 | 0.46 | 0.28 | 0.60 | 0.85 | 0.95 | 0.58 | 0.92 | 0.31 | 0.028 | 0.0012 | 0.0013 |
| 9 | 0.45 | 0.25 | 0.42 | 0.92 | 0.93 | 0.60 | 0.87 | 0.28 | 0.032 | 0.0009 | 0.0018 |
| 10 | 0.45 | 0.28 | 0.52 | 0.97 | 0.81 | 0.55 | 0.86 | 0.26 | 0.043 | 0.0011 | 0.0016 |
The tissue and field trash testing result of the steel of the present invention of table 3
The mechanical property of the steel of the present invention of table 4
The high strength low-alloy heat resistant steel of the present invention can be widely used for the equipment such as Aero-Space, automobile making, boiler, it
Successful design and exploitation will bring huge economic benefit, and its market prospects will be very huge.
Finally it should be noted that：Above example only not limits technology described in the invention to illustrate the present invention
Scheme；Therefore, although this specification with reference to each above-mentioned embodiment to present invention has been detailed description, this
Field it is to be appreciated by one skilled in the art that still can be modified to the present invention or equivalent substitution；And all do not depart from this
The technical scheme of the spirit and scope of invention and its improvement, it all should cover in scope of the presently claimed invention.
Claims (7)
1. a kind of high-obdurability low-alloy heat resisting steel, it is characterised in that the following component including percentage：
C：0.40~0.50%；
Si：0.15~0.35%；
Mn：0.40~0.70%；
Cr：0.80~1.10%；
Ni：0.80~1.00%；
Mo：0.45~0.65%；
W：0.80~1.00%；
V：0.25~0.35%；
Nb：0.015~0.08%；
N：≤ 0.002%；
O：≤ 0.0015%；
Surplus is Fe and inevitable impurity.
2. a kind of preparation method of high-obdurability low-alloy heat resisting steel as claimed in claim 1, it is characterised in that including as follows
Step：
Injecting electrode, consumable electrode vacuum furnace remelting are poured after vacuum induction melting, is forged and is become a useful person and be heat-treated.
3. preparation method according to claim 2, it is characterised in that the vacuum induction melting step includes following behaviour
Make：
First carbon is fitted into crucible, then by pure iron, W metal, metal Mo, metal W, metal Cr, metal V, metal Nb, crystallization Si
Load crucible, carrying out preheating to crucible to electricity with the power of rated power 30~40% makes raw material start fusing, and by crucible
Vacuum is evacuated to≤2.7Pa after, make raw material continue to melt by the 40~65% of power ascension to rated power, treat that raw material is all molten
It is melted into after molten steel, by more than the 90% of power ascension to rated power, keeps 8~12min, improve the temperature of the molten steel extremely
After 1570~1590 DEG C, the 30~40% of reduction power to rated power, which carries out insulation refining, is not less than 60min, insulation refining knot
Shu Hou, is filled with into crucible after inert gas to 6000Pa pressure, adds metal Mn, improves power to the 90% of rated power
After metal Mn is melted above, analysis is sampled, is tapped after composition is qualified and pours into electrode.
4. preparation method according to claim 2, it is characterised in that the consumable electrode vacuum furnace reflow step includes following behaviour
Make：
The one end of electrode with shrinkage cavity is subjected to remelting down, it is 2.5~3.0kg/min to control molten speed, keeps final vacuum
Below 0.1Pa, obtains steel ingot.
5. preparation method according to claim 4, it is characterised in that the forging becomes a useful person step including operating as follows：
By the Heating Steel Ingots to 1170~1190 DEG C, after 3~6h of insulation, by the 50~55% of steel ingot jumping-up to raw footage, so
After melt down and be heated to 1130~1150 DEG C, pulled out after 60~80min of insulation, starting forging temperature temperature >=1110 that control is pulled out
DEG C, stop forging temperature >=850 DEG C, last fire time pulling deflection >=35%.
6. preparation method according to claim 2, it is characterised in that the technical parameter of the heat treatment step is：
930~950 DEG C of normalizing, is incubated 1~3h, air cooling；Once it is tempered 580~600 DEG C of 5~7h of insulation, air cooling；Double tempering
580~600 DEG C of 3~5h of insulation, air cooling.
7. preparation method according to claim 3, it is characterised in that in the insulation refining process, sampling analysis treat N≤
After 30ppm, add alloy material and carry out trimming.
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| CN107267849A (en) * | 2017-05-27 | 2017-10-20 | 太原钢铁(集团)有限公司 | The preparation method of high alloy heat-resistance stainless steel pipe |
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| CN1286317A (en) * | 1999-08-18 | 2001-03-07 | 住友金属工业株式会社 | High strength low-alloy heat resistant steel |
| JP3334217B2 (en) * | 1992-03-12 | 2002-10-15 | 住友金属工業株式会社 | Low Cr ferritic heat resistant steel with excellent toughness and creep strength |
| CN101392353A (en) * | 2008-10-30 | 2009-03-25 | 上海大学 | High manganese and low chromium type high strength and toughness hot-work die steel and preparation method thereof |
| CN102162071A (en) * | 2010-02-23 | 2011-08-24 | 宝山钢铁股份有限公司 | Limit mandrel steel material for rolled tubes and preparation method thereof |
| CN105274443A (en) * | 2014-05-27 | 2016-01-27 | 宝钢特钢有限公司 | Mold forging steel and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3334217B2 (en) * | 1992-03-12 | 2002-10-15 | 住友金属工業株式会社 | Low Cr ferritic heat resistant steel with excellent toughness and creep strength |
| CN1286317A (en) * | 1999-08-18 | 2001-03-07 | 住友金属工业株式会社 | High strength low-alloy heat resistant steel |
| CN101392353A (en) * | 2008-10-30 | 2009-03-25 | 上海大学 | High manganese and low chromium type high strength and toughness hot-work die steel and preparation method thereof |
| CN102162071A (en) * | 2010-02-23 | 2011-08-24 | 宝山钢铁股份有限公司 | Limit mandrel steel material for rolled tubes and preparation method thereof |
| CN105274443A (en) * | 2014-05-27 | 2016-01-27 | 宝钢特钢有限公司 | Mold forging steel and preparation method thereof |
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