CN103320706A - Double rear-earth modified heat-resistant steel and preparation method thereof - Google Patents
Double rear-earth modified heat-resistant steel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses double rear-earth modified heat-resistant steel and a preparation method thereof. The heat-resistant steel comprises the components of, by weight, 0.3-0.8% of C, 1.0-2.0% of Si, 0.8-2.0% of Mn, 20-30% of Cr, 20-35% of Ni, 0.1-1.0% of Mo, 0.1-0.5% of rare earth Ce, 0.1-0.5% of rare earth Y, lower than 0.03% of S, lower than 0.03% of P, and balance of Fe. The heat-resistant steel has good high-temperature mechanical performance, oxidation resistance, sulfuration resistance, and carburizing resistance. The steel is a material suitable for heat-resistant components such as ethylene cracking furnace tube, thermal power plant gas-spraying burner, aluminum smelter combustion furnace, and heat-treatment furnace applied in high-temperature environments.
Description
Technical field
The invention belongs to the steel technical field, relate to a kind of high temperature steel, especially a kind of two rare earth modified high temperature steel and preparation method thereof are applicable to the parts such as resistance to oxidation, anti-sulfuration, anti-carburetting coking under the anti-corrosion operating mode of high temperature.
Background technology
High temperature steel welcomes the new period of development as the important a kind of corrosion resistant alloy material of special steel class from " 12 ", be that high temperature steel is to the important stage of high-qualityization development the coming years.To day by day the increasing of power consumption the time, be the discharging that reduces protection of the environment and reduce CO2 along with the raising of national economy and living standards of the people, China is in nuclear power and overcritical, ultra supercritical coal electricity generation technology stage efficient, cleaning energetically.The height that is limited by the used high temperature steel over-all properties of key part (mechanical property and etch resistant properties) of Fast Construction nuclear power, overcritical and ultra supercritical unit.In addition, high temperature steel is very abominable as the anti-corrosion environment of ethylene cracking tube in the petroleum refining equipment.There are sulfuration+carburizing+multifactor mutual erosion coking effects such as oxidation in use temperature simultaneously about 923～1423K even higher.Except requiring high temperature steel to have the good mechanical behavior under high temperature (such as creeping limit and creep rupture strength), also need excellent anti-complex dielectrics erosional competency.About improving the work-ing life of high temperature steel, home and abroad scholar and manufacturing enterprise have carried out many research and exploration at present.In fact, the exploitation about the New Heat-Resistant Steel material is not both at home and abroad having substantive breakthroughs aspect the mechanical behavior under high temperature (such as creeping limit and creep rupture strength).
In high temperature steel, add (reporting a lot of both at home and abroad) behind the single elements such as Rare-Earth Ce, La or Y, all improved to a certain extent high temperature steel mechanical behavior under high temperature and corrosion resisting property.Yet because different rare earth elements have the physics-chem characteristics such as different atomic radiuses, electronegativity and outer valence electron structure, therefore, although basic role is identical in high temperature steel, but advantage function really exist larger difference (as adding the effect of cerium (Ce) main advantage be: obviously cleaning molten steel, improve grain form etc., and then raising mechanical behavior under high temperature; The advantage function that adds rare-earth yttrium (Y) element is: can obviously improve the binding ability of corrosion products film density and film and matrix, and then improve corrosion resisting property).Obviously, to improve its over-all properties be inadequate to single rare earth modified heat resistant steel.Therefore, the two composite modified high temperature steel of rare earth of invention, by bringing into play simultaneously the collaborative advantage function of two kinds of rare earths, the over-all properties (mechanical behavior under high temperature and corrosion resisting property) of high temperature steel is significantly improved not only had important practical significance, and also be useful to saving precious rare earth resources.
It is ferrite type high temperature steel insert material that Chinese invention patent CN88109684.9 has invented chromium-molybdenum-vanadium-titanium-rare earth, its weight consists of: C:＜0.15%, Si:2.01-3.0%, Mn:0.10-0.60%, S, P＜0.03%, Cr:16-20%, Mo:0.5-2.5%, V0.08-0.20%, Ti :≤0.8%, Al:0.10-0.15%, RE:0.01-0.15%, all the other are iron.Although this material has good anti-oxidant, heat-resisting erosion, cold-and-heat resistent fatigue property, differ larger with work-ing life of external product (such as HK40, HP40 high temperature steel).Chinese invention patent CN86106715 has invented 1200 ℃ of high temperature steel of a kind of rare-earth and high chromium.Its component is by Gao Ge (30-36%), high-carbon (0.6-1.0%) and the element (N:0.2-0.33% such as an amount of nickel (7-10%) and rare earth alloy; Mn＜0.2%; Si＜1.6%; S＜0.04%; P＜0.06%; Rare earth ferrosilicon in packet header: 0.5%; Cr/C:30-60) form, this high chromium high temperature steel is still to add the mode of single rare earth and carries out modification, though have certain effect, does not wave the potentiality that rare earth improves over-all properties therein but fill.Chinese invention patent 97106118.1 has been invented a kind of rare-earth and high chromium nickel nitrogen high temperature steel, and its composition forms (C:0.3-0.85% by iron-based Gao Ge, an amount of carbon, nickel and rare earth element etc.; Cr:25-35%; Ni:15-18%; Si:1.5-2.5%; Mn≤1.20%; Mo:0.30-0.50%; N:0.20-0.33%; Ti:0.30-0.60%; RE:0.001-0.10%; S≤0.03%; P≤0.03%; Surplus is Fe and impurity, and total impurities≤0.10%, Cr/C=30-110).This alloy has anti-mixed burning coal powder air-flow wearing and tearing, impervious carbon, anti-oxidant, resistant to sulfide tarnishing, anti-deformation under 1250 ℃ of high temperature, has good machinability and weldability under as cast condition.The spray combustion nozzles in this steel suitable for casting fuel-burning power plant, the heat-resisting structures such as the roasting kiln of aluminium metallurgy factory, heat treatment furnace.To add micro-Rare Earth Elements Determination to carry out modification equally in this patent, when in fact rare earth adding quantity is not enough, not obvious to the improvement effect of its over-all properties.Chinese invention patent 200910168425.2 has been invented a kind of New Heat-Resistant Steel, and the principal character of this high temperature steel is to add a small amount of rare earth element and some other trace element (chemical composition: C:0.65-0.75% in common high temperature steel; Si:0.7-1.0%; Mn:1.0-1.2%; P:0.0005-0.0010%; S:0.005-0.006%; Cr:28-29%; Ni:20.5-21.0%; Mo:0.55-0.60%; Al:0.022-0.026%; Co:0.11-0.12%; Ti:0.0010-0.0015%; Nb:0.65-0.70%; V:0.055-0.065%; W:1.20-1.25%; Pb:0.0002-0.00025%; B:0.0005-0.0006%; Sn:0.0065-0.0075%; As:0.00010-0.00013%; Rare earth Bi:0.00010-0.00014%; Ca:0.0015-0.0025%; All the other are Fe).Although the more traditional high temperature steel over-all properties of this New Heat-Resistant Steel is significantly improved, chemical composition diversification and all multielements are traceization, and be wayward in process of production; In addition, add in this invention behind the rare earth element Bi of denier the effect of the over-all properties that improves steel actual and not obvious.Chinese invention patent 201010170655.5 has been invented a kind of rare earth high-chrome high-nickel high-temperature heat-resistant steel and preparation method thereof.Rare earth high-chrome high-nickel high-temperature heat-resistant steel of the present invention, elementary composition by following weight percent: C:0.25～0.35%; Cr:28～35%; Ni:25～35%; Si:1.2～2.5%; Mn≤1%; Mo:0.30～0.50%; Ti:0.30～0.60%; RE:0.001～0.10%; S≤0.03%; P≤0.03%; Surplus is Fe and impurity, and total impurities≤0.10%; Cr/C=30～110.Compared with the prior art this present invention just under the as cast condition good machinability and weldability are arranged, and founding is easy.Equally, this patent is still by adding Rare Earth Elements Determination carries out modification, and the high temperature steel over-all properties is significantly improved.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of two rare earth modified high temperature steel and preparation method thereof are provided, this high temperature steel has the performance of good mechanical behavior under high temperature and anti-oxidant, anti-sulfuration, anti-carburetting, the material such as the heat-resistant components such as the roasting kiln of the ethylene cracking tube that is suitable for being on active service under the hot environment, heat power plant's spray fuel gas nozzle, aluminium metallurgy factory, heat treatment furnace.
The objective of the invention is to solve by the following technical programs:
This two rare earth modified high temperature steel, according to weight percent, each composition of this high temperature steel is: the C of 0.3-0.8%, the Si of 1.0-2.0%, the Mn of 0.8-2.0%, the Cr of 20-30%, the Ni of 20-35%, the Mo of 0.1-1.0%, the Rare-Earth Ce of 0.1-0.5%, the Rare Earth Y of 0.1-0.5%, in addition, S＜0.03%, P＜0.03%, all the other are Fe.
The present invention also proposes a kind of preparation method of above-mentioned two rare earth modified high temperature steel, may further comprise the steps:
Step 1: take steel scrap, ferromanganese and ferrosilicon, ferrochrome, pure nickel, molybdenum-iron, cerium and rare-earth yttrium as starting material, according to each composition weight percent of described two rare earth modified high temperature steel, each starting material that calculate and weigh are prepared burden;
Step 2: steel scrap is heated to 1400 ℃ of fusings in electric furnace, after molten steel melts clearly, add successively and make temperature reach 1500 ℃ after ferromanganese and ferrosilicon melt clearly, and after adopting the aluminium wire deoxidation, add successively and make behind pure nickel, molybdenum-iron, the ferrochrome this moment liquid steel temperature reach 1600 ℃, again adopt the aluminium wire deoxidation and after liquid steel level slagging-off, molten steel come out of the stove rapidly pour the bottom into and mix to place in the casting ladle of cerium and rare-earth yttrium, leave standstill when making liquid steel temperature be 1500 ℃-1550 ℃, pour molten steel into casting-up and be shaped, namely obtain the heat-resisting steel part of as cast condition; Casting complete is shake out taking-up foundry goods after 10 hours;
Step 3: after the removing surface of as cast condition high temperature steel is clean, put into electric furnace and heat, be heated to 930-980 ℃ and insulation, the air cooling of coming out of the stove when then cooling to 250 ℃ with the furnace obtains the austenite heat-resistance steel part.
Further, the mean particle size of above-mentioned cerium is 10-15mm.
Further, the mean particle size of above-mentioned rare-earth yttrium is 10-15mm.
Further, in the step 3, when in electric furnace, heating, adopt the staged heating mode: temperature rise rate in the time of before 750 ℃＜200 ℃/hour, and be incubated processing by maximum ga(u)ge; Temperature rise rate＜500 ℃/hour in the time of 750 ℃-980 ℃.
Further, in the step 3, soaking time is: press the every increase of casting thickness 20mm, holding time 1 hour guarantees foundry goods internal and external temperature homogenizing.
The present invention has following beneficial effect:
The heat-resisting steel part that the present invention obtains has good mechanical property, and (normal temperature yield strength and tensile strength are respectively: σ
s〉=300MPa and σ
b〉=650MPa; The creeping limit, the creep rupture strength that used 1000 hours in the time of 800 ℃ are respectively:
In the time of 1000 ℃, use 1000 hours creeping limits, creep rupture strengths to be respectively:
) and corrosion resisting property (when using for 900 ℃, be more than 1.5～2.0 times of HP40 high temperature steel that Japanese Kubo field company produces its work-ing life as Ethylene Cracking Tube).
Embodiment
Two rare earth modified high temperature steel of the present invention, according to weight percent, its each composition is: the C of 0.3-0.8%, the Si of 1.0-2.0%, the Mn of 0.8-2.0%, the Cr of 20-30%, the Ni of 20-35%, the Mo of 0.1-1.0%, the Rare-Earth Ce of 0.1-0.5%, the Rare Earth Y of 0.1-0.5%, in addition, S＜0.03%, P＜0.03%, all the other are Fe.
According to above each composition ratio, below be the preparation method of two rare earth modified high temperature steel, specifically may further comprise the steps:
It is starting material that step 1, the present invention adopt steel scrap, ferromanganese and ferrosilicon, ferrochrome, pure nickel, molybdenum-iron, cerium and rare-earth yttrium, and according to each composition weight percent, each starting material that calculate and weigh are prepared burden;
Step 2, steel scrap is melted in electric furnace, after molten steel melts clearly, add successively ferromanganese and ferrosilicon molten clear and adopt the aluminium wire deoxidation after, after adding successively pure nickel, molybdenum-iron, ferrochrome, again adopt the aluminium wire deoxidation and after liquid steel level slagging-off, molten steel is come out of the stove rapidly pour the bottom into and mix in the casting ladle of placing cerium and yttrium, pour molten steel into casting-up after leaving standstill and be shaped, namely obtain the heat-resisting steel part of as cast condition, the certain hour shake out takes out foundry goods behind the casting complete.
Step 3, the removing surface of as cast condition high temperature steel is clean after, put into the electric furnace heating and (adopt the staged heating mode: temperature rise rate in the time of before 750 ℃＜200 ℃/hour, and be incubated processing by maximum ga(u)ge; Temperature rise rate＜500 ℃/hour in the time of 750 ℃-980 ℃; ) be heated to 930-980 ℃ and be incubated certain hour (press the every increase of casting thickness 20mm, holding time 1 hour guarantees foundry goods internal and external temperature homogenizing) after the air cooling of coming out of the stove when cooling to 250 ℃ with the furnace, obtain austenite+Cr
7C
3The heat-resisting steel part of type carbide.
Below in conjunction with embodiment the present invention is done and to describe in further detail:
Embodiment 1
Determine the chemical composition (weight percentage) of two rare earth modified high temperature steel: 0.3%C, 2.0%Si, 0.8%Mn, 20.3%Cr, 20.2%Ni, 0.1%Mo, 0.1% Rare-Earth Ce, 0.1% Rare Earth Y, S＜0.03%, P＜0.03%, all the other are Fe.
Calculate and the above-mentioned high temperature steel melting starting material of weighing: steel scrap, ferromanganese and ferrosilicon, ferrochrome, pure nickel, molybdenum-iron, cerium and rare-earth yttrium, prepare burden.
Steel scrap is heated to 1400 ℃ of fusings in electric furnace, after molten steel melts clearly, add successively and make temperature reach 1500 ℃ after ferromanganese and ferrosilicon melt clearly, and after adopting the aluminium wire deoxidation, add successively pure nickel, molybdenum-iron, making at this moment behind the ferrochrome, liquid steel temperature reaches 1600 ℃, again adopt the aluminium wire deoxidation and after liquid steel level slagging-off, molten steel come out of the stove rapidly pour the bottom into and mix to place in the casting ladle of cerium (mean particle size is about 10mm) and rare-earth yttrium (mean particle size is about 15mm), leave standstill when making liquid steel temperature be 1550 ℃, pour molten steel into casting-up and be shaped, namely obtain the heat-resisting steel part of as cast condition.10 hours shake outs of casting complete take out foundry goods.
After the removing surface of as cast condition high temperature steel is clean, (adopt the staged heating mode: temperature rise rate was 190 ℃/hour in the time of before 750 ℃, and is incubated processing by maximum ga(u)ge to put into the electric furnace heating; Temperature rise rate is 450 ℃/hour in the time of 750 ℃-980 ℃) be heated to 930 ℃ and be incubated 2.5 hours after, the air cooling of coming out of the stove when cooling to 250 ℃ with the furnace has obtained austenite+Cr
7C
3The heat-resisting steel part of type carbide.
At last, the heat-resisting steel part that obtains has good mechanical property:
Normal temperature yield strength and tensile strength are respectively: σ
s=305MPa and σ
b=652MPa; The creeping limit, the creep rupture strength that used 1000 hours in the time of 800 ℃ are respectively:
In the time of 1000 ℃, use 1000 hours creeping limits, creep rupture strengths to be respectively:
) and corrosion resisting property (under 900 ℃ and oxygen, hydrogen sulfide mixed atmosphere, approximately be 1.6 times of the HP40 high temperature steel produced of Japanese Kubo field company its work-ing life).
Embodiment 2
Determine the chemical composition (weight percentage) of two rare earth modified high temperature steel: 0.8%C, 1.0%Si, 1.95%Mn, 29.5%Cr, 39.6%Ni, 1.0%Mo, 0.5% Rare-Earth Ce, 0.5% Rare Earth Y, S＜0.03%, P＜0.03%, all the other are Fe.
Calculate and the above-mentioned high temperature steel melting starting material of weighing: steel scrap, ferromanganese and ferrosilicon, ferrochrome, pure nickel, molybdenum-iron, cerium and rare-earth yttrium, prepare burden.
Steel scrap is heated to 1400 ℃ of fusings in electric furnace, after molten steel melts clearly, add successively and make temperature reach 1500 ℃ after ferromanganese and ferrosilicon melt clearly, and after adopting the aluminium wire deoxidation, add successively pure nickel, molybdenum-iron, making at this moment behind the ferrochrome, liquid steel temperature reaches 1600 ℃, again adopt the aluminium wire deoxidation and after liquid steel level slagging-off, molten steel come out of the stove rapidly pour the bottom into and mix to place in the casting ladle of cerium (mean particle size is about 15mm) and rare-earth yttrium (mean particle size is about 10mm), leave standstill when making liquid steel temperature be 1500 ℃, pour molten steel into casting-up and be shaped, namely obtain the heat-resisting steel part of as cast condition.12 hours shake outs of casting complete take out foundry goods.
After the removing surface of as cast condition high temperature steel is clean, (adopt the staged heating mode: temperature rise rate was 50 ℃/hour in the time of before 750 ℃, and is incubated processing by maximum ga(u)ge to put into the electric furnace heating; Temperature rise rate is 100 ℃/hour in the time of 750 ℃-980 ℃) be heated to 980 ℃ and be incubated 2.5 hours after, the air cooling of coming out of the stove when cooling to 250 ℃ with the furnace has obtained austenite+Cr
7C
3The heat-resisting steel part of type carbide.
At last, the heat-resisting steel part that obtains has good mechanical property:
Normal temperature yield strength and tensile strength are respectively: σ
s=371MPa and σ
b=693MPa; The creeping limit, the creep rupture strength that used 1000 hours in the time of 800 ℃ are respectively:
In the time of 1000 ℃, use 1000 hours creeping limits, creep rupture strengths to be respectively:
) and corrosion resisting property (under 900 ℃ and oxygen, hydrogen sulfide mixed atmosphere, approximately be 2.3 times of the HP40 high temperature steel produced of Japanese Kubo field company its work-ing life).
Embodiment 3
Determine the chemical composition (weight percentage) of two rare earth modified high temperature steel: 0.5%C, 1.4%Si, 1.45%Mn, 25.3%Cr, 30.1%Ni, 0.5%Mo, 0.25% Rare-Earth Ce, 0.25% Rare Earth Y, S＜0.03%, P＜0.03%, all the other are Fe.
Calculate and the above-mentioned high temperature steel melting starting material of weighing: steel scrap, ferromanganese and ferrosilicon, ferrochrome, pure nickel, molybdenum-iron, cerium and rare-earth yttrium, prepare burden.
Steel scrap is heated to 1400 ℃ of fusings in electric furnace, after molten steel melts clearly, add successively and make temperature reach 1500 ℃ after ferromanganese and ferrosilicon melt clearly, and after adopting the aluminium wire deoxidation, add successively pure nickel, molybdenum-iron, making at this moment behind the ferrochrome, liquid steel temperature reaches 1600 ℃, again adopt the aluminium wire deoxidation and after liquid steel level slagging-off, molten steel come out of the stove rapidly pour the bottom into and mix to place in the casting ladle of cerium (mean particle size is about 10mm) and rare-earth yttrium (mean particle size is about 15mm), leave standstill when making liquid steel temperature be 1520 ℃, pour molten steel into casting-up and be shaped, namely obtain the heat-resisting steel part of as cast condition.10 hours shake outs of casting complete take out foundry goods.
After the removing surface of as cast condition high temperature steel is clean, (adopt the staged heating mode: temperature rise rate was 100 ℃/hour in the time of before 750 ℃, and is incubated processing by maximum ga(u)ge to put into the electric furnace heating; Temperature rise rate is 200 ℃/hour in the time of 750 ℃-980 ℃) be heated to 950 ℃ and be incubated 2.5 hours after, the air cooling of coming out of the stove when cooling to 250 ℃ with the furnace has obtained austenite+Cr
7C
3The heat-resisting steel part of type carbide.
At last, it is as follows that the heat-resisting steel part that obtains has good mechanical property:
Normal temperature yield strength and tensile strength are respectively: σ
s=365MPa and σ
b=674MPa; The creeping limit, the creep rupture strength that used 1000 hours in the time of 800 ℃ are respectively:
In the time of 1000 ℃, use 1000 hours creeping limits, creep rupture strengths to be respectively:
) and corrosion resisting property (under 900 ℃ and oxygen, hydrogen sulfide mixed atmosphere, approximately be 1.8 times of the HP40 high temperature steel produced of Japanese Kubo field company its work-ing life).
Embodiment 4
Determine the chemical composition of two rare earth modified high temperature steel, according to weight percent, each composition of this high temperature steel is: 0.6% C, 1.5% Si, 2.0% Mn, 20% Cr, 20% Ni, 0.8% Mo, 0.4% Rare-Earth Ce, 0.3% Rare Earth Y, in addition, S＜0.03%, P＜0.03%, all the other are Fe.
Calculate and the above-mentioned high temperature steel melting starting material of weighing: steel scrap, ferromanganese and ferrosilicon, ferrochrome, pure nickel, molybdenum-iron, cerium and rare-earth yttrium, prepare burden.
Steel scrap is heated to 1400 ℃ of fusings in electric furnace, after molten steel melts clearly, add successively and make temperature reach 1500 ℃ after ferromanganese and ferrosilicon melt clearly, and after adopting the aluminium wire deoxidation, add successively pure nickel, molybdenum-iron, making at this moment behind the ferrochrome, liquid steel temperature reaches 1600 ℃, again adopt the aluminium wire deoxidation and after liquid steel level slagging-off, molten steel come out of the stove rapidly pour the bottom into and mix to place in the casting ladle of cerium (mean particle size is about 10-15mm) and rare-earth yttrium (mean particle size is about 10-15mm), leave standstill when making liquid steel temperature be 1500 ℃, pour molten steel into casting-up and be shaped, namely obtain the heat-resisting steel part of as cast condition.Casting complete is shake out taking-up foundry goods after 10 hours.
After again the removing surface of as cast condition high temperature steel is clean, put into the electric furnace heating and (adopt the staged heating mode: temperature rise rate in the time of before 750 ℃＜200 ℃/hour, and be incubated processing by maximum ga(u)ge; Temperature rise rate＜500 ℃/hour in the time of 750 ℃-980 ℃; ) be heated to 930-980 ℃ and be incubated certain hour (press the every increase of casting thickness 20mm, holding time 1 hour guarantees foundry goods internal and external temperature homogenizing) after the air cooling of coming out of the stove when cooling to 250 ℃ with the furnace, obtain the austenite heat-resistance steel part.
Embodiment 5
Determine the chemical composition of two rare earth modified high temperature steel, according to weight percent, each composition of this high temperature steel is: 0.7% C, 1.6% Si, 1.7% Mn, 30% Cr, 35% Ni, 0.8% Mo, 0.4% Rare-Earth Ce, 0.3% Rare Earth Y, in addition, S＜0.03%, P＜0.03%, all the other are Fe.
Calculate and the above-mentioned high temperature steel melting starting material of weighing: steel scrap, ferromanganese and ferrosilicon, ferrochrome, pure nickel, molybdenum-iron, cerium and rare-earth yttrium, prepare burden.
Steel scrap is heated to 1400 ℃ of fusings in electric furnace, after molten steel melts clearly, add successively and make temperature reach 1500 ℃ after ferromanganese and ferrosilicon melt clearly, and after adopting the aluminium wire deoxidation, add successively pure nickel, molybdenum-iron, making at this moment behind the ferrochrome, liquid steel temperature reaches 1600 ℃, again adopt the aluminium wire deoxidation and after liquid steel level slagging-off, molten steel come out of the stove rapidly pour the bottom into and mix to place in the casting ladle of cerium (mean particle size is about 10-15mm) and rare-earth yttrium (mean particle size is about 10-15mm), leave standstill when making liquid steel temperature be 1500 ℃, pour molten steel into casting-up and be shaped, namely obtain the heat-resisting steel part of as cast condition.Casting complete is shake out taking-up foundry goods after 10 hours.
After again the removing surface of as cast condition high temperature steel is clean, put into the electric furnace heating and (adopt the staged heating mode: temperature rise rate in the time of before 750 ℃＜200 ℃/hour, and be incubated processing by maximum ga(u)ge; Temperature rise rate＜500 ℃/hour in the time of 750 ℃-980 ℃; ) be heated to 930-980 ℃ and be incubated certain hour (press the every increase of casting thickness 20mm, holding time 1 hour guarantees foundry goods internal and external temperature homogenizing) after the air cooling of coming out of the stove when cooling to 250 ℃ with the furnace, obtain the austenite heat-resistance steel part.
In sum, two rare earth modified high temperature steel of the present invention not only high-temperature mechanics are higher than Japanese HP40 high temperature steel, and it is anti-oxidant, curability is also high than HP40.Obviously, this is for the development of high temperature steel, and the present invention has important pushing effect.
Claims (6)
1. two rare earth modified high temperature steel is characterized in that, according to weight percent, each composition of this high temperature steel is: the C of 0.3-0.8%, the Si of 1.0-2.0%, the Mn of 0.8-2.0%, the Cr of 20-30%, the Ni of 20-35%, the Mo of 0.1-1.0%, the Rare-Earth Ce of 0.1-0.5%, the Rare Earth Y of 0.1-0.5%, in addition, S＜0.03%, P＜0.03%, all the other are Fe.
2. the preparation method of the described two rare earth modified high temperature steel of claim 1 is characterized in that, may further comprise the steps:
Step 1: take steel scrap, ferromanganese and ferrosilicon, ferrochrome, pure nickel, molybdenum-iron, cerium and rare-earth yttrium as starting material, according to each composition weight percent of described two rare earth modified high temperature steel, each starting material that calculate and weigh are prepared burden;
Step 2: with steel scrap heat fused in electric furnace, after molten steel melts clearly, add successively ferromanganese and ferrosilicon molten clear, and after adopting the aluminium wire deoxidation, after adding successively pure nickel, molybdenum-iron, ferrochrome, again adopt the aluminium wire deoxidation and after liquid steel level slagging-off, molten steel is come out of the stove rapidly pour the bottom into and mix in the casting ladle of placing cerium and rare-earth yttrium, pour molten steel into casting-up after leaving standstill and be shaped, namely obtain the heat-resisting steel part of as cast condition; Shake out takes out foundry goods behind the casting complete;
Step 3: after the removing surface of as cast condition high temperature steel is clean, put into electric furnace and heat, be heated to 930-980 ℃ and insulation, the air cooling of coming out of the stove when then cooling to 250 ℃ with the furnace obtains the austenite heat-resistance steel part.
3. the preparation method of two rare earth modified high temperature steel according to claim 2 is characterized in that, the mean particle size of described cerium is 10-15mm.
4. the preparation method of two rare earth modified high temperature steel according to claim 2 is characterized in that, the mean particle size of described rare-earth yttrium is 10-15mm.
5. the preparation method of two rare earth modified high temperature steel according to claim 2, it is characterized in that, in the step 3, when in electric furnace, heating, adopt the staged heating mode: temperature rise rate in the time of before 750 ℃＜200 ℃/hour, and be incubated processing by maximum ga(u)ge; Temperature rise rate＜500 ℃/hour in the time of 750 ℃-980 ℃.
6. the preparation method of two rare earth modified high temperature steel according to claim 2 is characterized in that, in the step 3, soaking time is: press the every increase of casting thickness 20mm, holding time 1 hour guarantees foundry goods internal and external temperature homogenizing.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108823503A (en) * | 2018-08-13 | 2018-11-16 | 广东省材料与加工研究所 | A kind of austenitic heat-resistance steel and preparation method thereof containing rare-earth yttrium |
| CN109576580A (en) * | 2018-11-29 | 2019-04-05 | 武汉华培动力科技有限公司 | Diesel engine pressure booster with variable cross section nozzle assembly heat resisting steel and smelting process |
| CN115287523A (en) * | 2022-07-19 | 2022-11-04 | 山西太钢不锈钢股份有限公司 | Process method for reducing nitrogen content of iron-based heat-resistant alloy |
| CN116536585A (en) * | 2023-05-18 | 2023-08-04 | 山东山水重工有限公司 | Preheater hanging plate and preparation method thereof |
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| CN102308015A (en) * | 2009-02-16 | 2012-01-04 | 住友金属工业株式会社 | Method for manufacturing metal pipe |
| CN102337476A (en) * | 2011-10-25 | 2012-02-01 | 杨学焦 | Novel heat-resistant steel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102308015A (en) * | 2009-02-16 | 2012-01-04 | 住友金属工业株式会社 | Method for manufacturing metal pipe |
| CN102337476A (en) * | 2011-10-25 | 2012-02-01 | 杨学焦 | Novel heat-resistant steel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108823503A (en) * | 2018-08-13 | 2018-11-16 | 广东省材料与加工研究所 | A kind of austenitic heat-resistance steel and preparation method thereof containing rare-earth yttrium |
| CN109576580A (en) * | 2018-11-29 | 2019-04-05 | 武汉华培动力科技有限公司 | Diesel engine pressure booster with variable cross section nozzle assembly heat resisting steel and smelting process |
| CN115287523A (en) * | 2022-07-19 | 2022-11-04 | 山西太钢不锈钢股份有限公司 | Process method for reducing nitrogen content of iron-based heat-resistant alloy |
| CN115287523B (en) * | 2022-07-19 | 2023-12-29 | 山西太钢不锈钢股份有限公司 | Technological method for reducing nitrogen content of iron-based heat-resistant alloy |
| CN116536585A (en) * | 2023-05-18 | 2023-08-04 | 山东山水重工有限公司 | Preheater hanging plate and preparation method thereof |
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| CN103320706B (en) | 2015-12-02 |
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