CN106086710A - A kind of Rare earth heat-resistant steel and casting technique thereof - Google Patents
A kind of Rare earth heat-resistant steel and casting technique thereof Download PDFInfo
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- CN106086710A CN106086710A CN201610716464.1A CN201610716464A CN106086710A CN 106086710 A CN106086710 A CN 106086710A CN 201610716464 A CN201610716464 A CN 201610716464A CN 106086710 A CN106086710 A CN 106086710A
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
Abstract
The present invention relates to heat resisting steel field, the alloy design of a kind of Rare earth heat-resistant steel is developed with casting technique, by RE alloyed, it is thus achieved that superhigh temperature heat resistance.Alloying component is mainly based on high chromium-stainless steel, is main austenizer with nitrogen, and addition rare earth element carries out alloying in smelting process；By weight percentage, alloy component range is: C 0.20～0.45, Si 0.82～2.55, Mn 2.0～13.0, Cr 10.5～29.0, Ni 0.9～2.5, Mo 0.3～0.6, O≤0.0025, N 0.0050～0.9, P≤0.020, S≤0.015, RE 0.001～0.6, Fe surplus.Using the alloying component of the present invention and smelting process, melting molten steel is cast, and the foundry goods poured into a mould, steel ingot, continuous casting billet, high purity, field trash is few and tiny, Mass, tissue hyperthermia good stability, has elevated temperature strength and the high-temperature oxidation resistance of excellence.
Description
Technical field
The present invention relates to heat resisting steel field, the design of material of a kind of Rare earth heat-resistant steel and casting technique, utilize dilute
Soil carries out further alloying to steel alloy so that it is have super performance.
Background technology
Heat resisting steel is applied widely, but heat resisting steel elevated temperature strength is low, and the problem such as antioxidation, is not difficult to solve always.
General ability steel operating temperature is more than 900 DEG C, and intensity starts to be decreased obviously, and oxidation rate is the most substantially accelerated.For continuous annealing furnace
Radial canal, the burner etc. of circular heating furnace, be required to heat-resisting steel material.Traditional heat-resisting steel material is mainly Cr25Ni20,
People were in order to improve material temperature capacity and oxidation resistance later, improve again material chromium nickel content, and some furnace tube materials are used
Arrive Cr35Ni30.But, when temperature continues to raise, the elevated temperature strength of these materials declines very fast, and hot isostatic apparatus
In mozzle, barrel etc., need more than 1000 DEG C, work under the ultra-high temperature condition of even up to 1250 DEG C.Therefore, along with
The increasing of work equipment under ultra-high temperature condition, the heat-resisting steel material that exploitation is suitable under ultra-high temperature condition working increasingly seems tight
Compel.
Summary of the invention
It is an object of the invention to provide design of material and the casting technique of a kind of Rare earth heat-resistant steel, use the smelting of the present invention
Refining and pouring procedure, by rare Earth Alloying Treatment molten steel, it is achieved molten steel, foundry goods, steel ingot, the ultra-pure purification of continuous casting billet, thus carry
The elevated temperature strength of high heat resisting steel and high-temperature oxidation resistance.
The technical scheme is that
A kind of Rare earth heat-resistant steel, alloying component is mainly based on high chromium-stainless steel, is main austenitizing unit with nitrogen
Element, and addition rare earth element carries out alloying in smelting process；By weight percentage, alloy component range is: C 0.20
～0.45, Si 0.82～2.55, Mn 2.0～13.0, Cr 10.5～29.0, Ni 0.9～2.5, Mo 0.3～0.6, O≤
0.0025, N 0.0050～0.9, P≤0.020, S≤0.015, RE 0.01～0.38, Fe surplus.
Described Rare earth heat-resistant steel, it is preferred that by weight percentage, alloy component range is: C 0.25～0.35, Si
1.8～2.2, Mn 10.5～11.5, Cr 19.0～21.0, Ni 1.8～2.2, Mo 0.3～0.4, O≤0.0020, N 0.30
～0.40, P≤0.015, S≤0.010, RE 0.02～0.06, Fe surplus.
The casting technique of described Rare earth heat-resistant steel, uses pure steel scrap or molten iron to smelt, and intermediate alloy all preheats
Process, select pure rare earth to carry out Alloying Treatment as dispensing, use high temperature solid solution Technology for Heating Processing to carry out heat treatment.
The casting technique of described Rare earth heat-resistant steel, use intermediate frequency furnace smelt, nitrided ferro-chromium intermediate alloy preheating 400～
800 DEG C, add in batches.
The casting technique of described Rare earth heat-resistant steel, before RE-treated, phosphorus content≤0.020wt%, and carry out ladle essence
Furnace refine, deep desulfurization, sulfur content≤0.015wt%, enter back into vacuum refining furnace, vacuum fine is made steel, oxygen content≤15ppm,
Nitrogen content≤50ppm.
The casting technique of described Rare earth heat-resistant steel, the process utilizing rare Earth Alloying Treatment molten steel is as follows:
(1) steel treatment of pouring cast part
Electrolysis pure rare earth alloy, makes square block, every piece 0.1～0.5kg；Utilize sandblasting machine to process clean, expose metal
Gloss, wraps up with aluminium foil, puts in sealing drum, and inflated with nitrogen is protected；Rare earth adding quantity is the 0.01～0.6% of Metal Weight, will
Rare earth is divided into two parts by weight 2:1, and few is partially disposed in the bag end, puts together with deoxidizer, wrap with aluminium foil；Many portions
During separating steel, adding with steel flow, rare earth alloy enters in bag with molten steel, and in steel ladle, punching is mixed；
(2) cast steel ingot, the steel treatment of continuous casting billet
Electrolysis pure rare earth alloy, makes square block, every piece 0.5～1.5kg；Utilize sandblasting machine to process clean, expose metal
Gloss, wraps up with aluminium foil, puts in sealing drum, and inflated with nitrogen is protected；Rare earth adding quantity is the 0.01～0.6% of Metal Weight, will
Bell jar put into by rare earth alloy, directly from top add ladle refining furnace, and keep ladle refining furnace continue Argon 10～
20min, then pour into a mould.
The casting technique of described Rare earth heat-resistant steel, the heat treatment of foundry goods uses high temperature, solid solution, strengthened Quenching Treatment, solid solution
Temperature 1000～1250 DEG C, solution time is pressed wall thickness dimension and is calculated, and often increases 25mm thick, and temperature retention time increases by 0.5～2.0h, goes out
Furnace rear shrend.
The casting technique of described Rare earth heat-resistant steel, rare earth alloy selects high-purity lanthanum cerium mischmetal alloy, rare earth element content
More than 99wt%；In lanthanum cerium mischmetal alloy, lanthanum: cerium weight ratio is 1:(1～3).
The casting technique of described Rare earth heat-resistant steel, by adding rare earth alloy, crystal grain thinning in bag, refines field trash,
Grain size is more than 4 grades, and field trash summation is less than 3.0 grades；Rare earth pinning crystal boundary, iron phosphide eutectic cannot segregation, reduce grain boundary oxidation,
Improve material against oxidative ability.
The casting technique of described Rare earth heat-resistant steel, by higher temperature solid solution, makes carbide fully dissolve, it is ensured that material
The single fully austenitic structure of initial structure, under arms during, carbide crystal boundary with again separate out within the border, high temperature is greatly improved
Under the conditions of structure stability, so that it is guaranteed that service temperature reaches the ultra-high temperature scope of 1000～1250 DEG C.
Advantages of the present invention and providing the benefit that:
1. the present invention utilizes rare earth alloy that novel alloy molten steel carries out Alloying Treatment, then be cast into foundry goods, steel ingot or
Continuous casting billet, forms heat-resisting alloy foundry goods or blank.Thus, by controlling Molten Steel Cleanliness, RE alloyed process, reduces molten steel
Oxidation, refinement field trash, make cast even tissue, and grain size reaches more than 4 grades.It is high that rare earth pinning crystal boundary improves material
Temperature intensity, material prepared by the present invention is that more than 1000 DEG C superhigh temperature operation equipment provide strong supporting.
2. the present invention utilizes rare earth to carry out alloying, makes material purity improve further, effectively inhibits material at high temperature
Electrochemical corrosion, improves the oxidation resistance of heat resisting steel.
3. the present invention is prepared for full austenite rare earth steel, uses alloying component and smelting process, the melting molten steel of the present invention
Casting, the foundry goods poured into a mould, steel ingot, continuous casting billet, even tissue, densification, field trash is few, tiny, Mass, material structure list
One, it is not susceptible to phase transformation, makes tissue more stable, improve stability of material and thermal fatigue resistance, and ensure that material
Elevated temperature strength and high-temperature oxidation resistance.
Accompanying drawing explanation
Fig. 1 is high temperature insostatic pressing (HIP) guide shell foundry goods and machined piece schematic diagram；Wherein, (a) is foundry goods；B () is that machinery adds
Workpiece.
Fig. 2 is high temperature insostatic pressing (HIP) guide shell casting process scheme sketch (reduced scale 25 ‰, molten steel gross weight 1.3 tons)；Wherein, (a)
For front view；B () is top view.
Detailed description of the invention
In specific implementation process, the design of material of Rare earth heat-resistant steel of the present invention and casting technique, use pure steel scrap to enter
Row is smelted, the equal the pre-heat treatment of intermediate alloy.Select pure rare earth to carry out Alloying Treatment as dispensing, use high temperature solid solution heat treatment
Technique carries out heat treatment, ensures material structure and performance.
1, Rare earth heat-resistant steel smelting process, is to carry out alloying process based on austenitic steel.Weight smelted by austenitic steel
Point be strictly to control impurity element, fully oxidized dephosphorization, then deoxidation desulfuration, on this basis add austenitizing alloy ferromanganese and
Nitrided ferro-chromium.Phosphorus content≤0.020wt%, and carry out ladle refining furnace refine, deep desulfurization, sulfur content≤0.015wt%, then enter
Entering vacuum refining furnace, vacuum fine is made steel, oxygen content≤15ppm, nitrogen content≤50ppm.The intermediate alloy such as ferromanganese and nitrided ferro-chromium
Carry out the pre-heat treatment, treatment temperature 400～800 DEG C, and be dividedly in some parts, it is ensured that the recovery rate of nitrogen is more than 50%.
2, rare Earth Alloying Treatment molten steel is utilized, can be with degree of depth deoxidation, thinning microstructure.Pouring cast part and cast steel ingot, continuous casting
The rare earth alloy adding technology of base is different.
(1) steel treatment of pouring cast part can be carried out in the following manner.Electrolysis pure rare earth alloy, makes square block, greatly
About 0.1～0.5kg every piece.Utilize sandblasting machine to process clean, expose metallic luster, wrap up with aluminium foil, put in sealing drum, nitrogen charging
Gas shielded.In smelting process, by ladle chemistry, mainly according to Oxygen Content in Liquid Steel, difference adds different amounts of rare earth.Dilute
Soil addition be Metal Weight 0.01～0.6% (finished product heat proof material Rare Earth Element Contents be 0.001wt%～
0.38wt%).By weight 2:1, rare earth is divided into two parts, and few is partially disposed in the bag end, puts together with deoxidizer, use aluminum
Paper tinsel is wrapped；In many part tapping process, adding with steel flow, rare earth alloy enters in bag with molten steel, and in steel ladle, punching is mixed.
(2) cast steel ingot, the molten steel of continuous casting billet, carries out RE alloyed as follows.Electrolysis pure rare earth alloy, makes
Square block, about 0.5～1.5kg every piece.Utilize sandblasting machine to process clean, expose metallic luster, wrap up with aluminium foil, put into sealing
In Tong, inflated with nitrogen is protected.In smelting process, by ladle chemistry, mainly according to Oxygen Content in Liquid Steel, difference adds the most commensurability
Rare earth.Rare earth adding quantity is the 0.01～0.6% of Metal Weight.Rare earth alloy is put into special bell jar, directly adds from top
Enter ladle refining furnace, and keep ladle refining furnace to continue Argon 15min, then pour into a mould.
Foundry goods is different with the subsequent handling of steel ingot, continuous casting billet, and heat treatment method is the most different.Foundry goods needs to carry out strict heat
Process, directly reach the tissue required for use and performance.Steel ingot, continuous casting billet need to carry out postorder forging and rolling, therefore only
Need to process into burial pit slow cooling.Foundry goods and steel ingot, the heat treatment of continuous casting billet use higher temperature solid solution, solid solubility temperature 1000～
1250 DEG C (± 5 DEG C), solution time is pressed wall thickness dimension and is calculated, and often increases 25mm thick, water of coming out of the stove after temperature retention time increase by 1～2.5h
Quench.
Below in conjunction with the accompanying drawings and embodiment describe in detail the present invention.
Embodiment
In the present embodiment, producing high temperature insostatic pressing (HIP) guide shell foundry goods as a trial, spray weight is: 910kg, band rising head and cast gate
Weight is 1200kg, filling time 25s, pouring temperature 1560～1570 DEG C.Castings material is Rare earth heat-resistant steel (NRRE1250),
Its concrete composition is as follows:
| Embodiment | C | Si | Mn | Cr | Ni | Mo | O | N | P | S | RE | Fe |
| 1 | 0.21 | 1.2 | 12.8 | 18.1 | 2.3 | 0.32 | 0.0023 | 0.57 | 0.018 | 0.011 | 0.06 | Remaining |
| 2 | 0.28 | 1.6 | 11.3 | 19.6 | 1.8 | 0.44 | 0.0017 | 0.45 | 0.015 | 0.008 | 0.10 | Remaining |
| 3 | 0.36 | 2.3 | 9.6 | 22.3 | 2.1 | 0.52 | 0.0019 | 0.33 | 0.016 | 0.011 | 0.03 | Remaining |
| 4 | 0.44 | 2.1 | 8.8 | 21.1 | 1.2 | 0.36 | 0.0021 | 0.42 | 0.015 | 0.013 | 0.31 | Remaining |
As Figure 1-Figure 2, high temperature insostatic pressing (HIP) guide shell casting process scheme of the present invention is as follows:
1) strict control composition, starts with from dispensing, uses high-quality steel scrap, crome metal, low-phosphorous ferromanganese and molybdenum-iron to carry out dispensing,
By molten steel total amount 15 tons preparation.Medium-frequency induction furnace is smelted, and strictly controls phosphorus content, uses special dephosphorization agent dephosphorization, and P≤
0.005wt%, then carry out ladle refining furnace refine, adding alloy, reduction deoxidization desulfuration, make oxygen content be less than 15ppm, sulfur is less than
0.005wt%, refined molten steel waits RE-treated.
2) utilizing quartz sand to manufacture sand mold and core, make binding agent with alkalescent phenol resin, binding agent addition is quartz
The 1.2% of sand weight, makees firming agent with benzenesulfonic acid, and firming agent addition is the 0.6wt% of quartz sand weight, and mixed grind 1 point
Clock, sand mold and core surface brush alkalescence magnesia powder coating.
As in figure 2 it is shown, guide shell is by upper, middle and lower three-cavity moulding, uses bottom gating, top box arranges annular
Feeding head.
3) molten steel smelted in advance is carried out RE alloyed.Prepare lanthanum cerium mischmetal alloy (in lanthanum cerium mischmetal alloy, dilute
Earth elements content 99wt%, lanthanum: cerium weight ratio is 1:2), use alloy rare earth elements to account for the rare earth alloy of 0.08wt%
120kg。
4) add rare earth alloy in ladle, use bell jar form, rare earth alloy is applied directly in molten steel, through slag, slag
Below face, 300～500mm react.After reaction, soft blow 5～15min, start cast.
5) three groups of foundry goods are poured into a mould in advance, remaining 3 tons of small-sized steel ingots of pouring molten steel and sample.
6) after cast, 1 hour shake out.Carry out heat treatment after casting cleaning, use 1150 ± 5 DEG C of higher temperature solid solution.
The present embodiment, by adding rare earth alloy, crystal grain thinning in bag, refines field trash；As-cast grain degree more than 4 grades,
Field trash summation is less than 3.0 grades.Thus, make cast structure uniformly, refinement, reduce field trash, improve the elevated temperature strength of foundry goods
And antioxygenic property.Thus, make guide shell under 1250 DEG C of hot conditionss, can normally work.Material at high temperature intensity is in amplitude
Improve, through detecting with stove sample, when 1250 DEG C, material at high temperature tensile strength 30MPa, meet design requirement.
Work process of the present invention and result:
The comparison determined due to present invention process scheme is reasonable, and the measures taked all serves corresponding effect.
1) appropriate design alloying component, accurately controls austenizer content, and making material matrix is single austenite phase.2) strictly control
Molten Steel Cleanliness processed, through external refining, makes Oxygen Content in Liquid Steel control within 25ppm, and phosphorus controls at below 0.020wt%,
To improving material at high temperature intensity, serve pivotal role.3) utilize rare earth to carry out Alloying Treatment, make molten steel purity carry further
Height, and make field trash be refined, improve material against oxidative performance.4) use higher temperature solid solution Technology for Heating Processing, make
In material, carbide fully decomposes, and has staticized crystal boundary, improves foundry goods Thermal fatigue properties.
In the present embodiment, pouring into molten steel weight metal is 1250kg, wherein casting weight 910kg, filling time 25 seconds.Dilute
Soil uses bell jar mode to process in ladle, and reacting balance does not has splash；Observe from rising head, find that molten metal is clean, upper peaceful
Surely.Shake out after 1h after cast, surface quality of continuous castings is good.
Comparative example
The domestic and international enterprise of guide shell foundry goods had produced, and all used Cr25Ni20 material.Cr25Ni20 belong to heat-resisting not
Rust steel, after casting pouring, needs to bury for a long time at sand mold, and production efficiency is relatively low.Further, foundry goods deforms bigger in using.
Using Cr25Ni20 material to make superhigh temperature heat-resistant piece, due to the sand casting used, material structure is thick, and field trash is more.
Rare-earth heat-resistant Steel material of the present invention belongs to fully austenitic structure, it is impossible to carry out grain refining process by heat treatment method, at Re Chu
After reason, as-cast structure yet suffers from, and is unfavorable for that material antioxygen property improves.During Cr25Ni20 guide shell uses, often
Internal oxidition phenomenon occurs, affects foundry goods service life.
Claims (10)
1. a Rare earth heat-resistant steel, it is characterised in that: alloying component is mainly based on high chromium-stainless steel, with nitrogen for main difficult to understand
Family name's body element, and addition rare earth element carries out alloying in smelting process；By weight percentage, alloy component range
For: C 0.20～0.45, Si 0.82～2.55, Mn 2.0～13.0, Cr 10.5～29.0, Ni 0.9～2.5, Mo 0.3～
0.6, O≤0.0025, N 0.0050～0.9, P≤0.020, S≤0.015, RE 0.01～0.38, Fe surplus.
2. according to the Rare earth heat-resistant steel described in claim 1, it is characterised in that: preferably, by weight percentage, alloying component
Scope is: C 0.25～0.35, Si 1.8～2.2, Mn 10.5～11.5, Cr 19.0～21.0, Ni 1.8～2.2, Mo
0.3～0.4, O≤0.0020, N 0.30～0.40, P≤0.015, S≤0.010, RE 0.02～0.06, Fe surplus.
3. the casting technique of the Rare earth heat-resistant steel described in a claim 1, it is characterised in that use pure steel scrap or molten iron to enter
Row is smelted, the equal the pre-heat treatment of intermediate alloy, selects pure rare earth to carry out Alloying Treatment as dispensing, uses high temperature solid solution heat treatment
Technique carries out heat treatment.
4. according to the casting technique of the Rare earth heat-resistant steel described in claim 3, it is characterised in that use intermediate frequency furnace to smelt, nitridation
Ferrochrome intermediate alloy preheats 400～800 DEG C, adds in batches.
5. according to the casting technique of the Rare earth heat-resistant steel described in claim 3, it is characterised in that before RE-treated, phosphorus content≤
0.020wt%, and carry out ladle refining furnace refine, deep desulfurization, sulfur content≤0.015wt%, enter back into vacuum refining furnace, vacuum
Purified steel, oxygen content≤15ppm, nitrogen content≤50ppm.
6. according to the casting technique of the Rare earth heat-resistant steel described in claim 3, it is characterised in that utilize rare Earth Alloying Treatment molten steel
Process as follows:
(1) steel treatment of pouring cast part
Electrolysis pure rare earth alloy, makes square block, every piece 0.1～0.5kg；Utilize sandblasting machine to process clean, expose metallic luster,
Wrapping up with aluminium foil, put in sealing drum, inflated with nitrogen is protected；Rare earth adding quantity is the 0.01～0.6% of Metal Weight, is pressed by rare earth
Weight ratio 2:1 is divided into two parts, and few is partially disposed in the bag end, puts together with deoxidizer, wrap with aluminium foil；Many part tappings
During, adding with steel flow, rare earth alloy enters in bag with molten steel, and in steel ladle, punching is mixed；
(2) cast steel ingot, the steel treatment of continuous casting billet
Electrolysis pure rare earth alloy, makes square block, every piece 0.5～1.5kg；Utilize sandblasting machine to process clean, expose metallic luster,
Wrapping up with aluminium foil, put in sealing drum, inflated with nitrogen is protected；Rare earth adding quantity is the 0.01～0.6% of Metal Weight, is closed by rare earth
Gold puts into bell jar, directly adds ladle refining furnace from top, and keeps ladle refining furnace to continue Argon 10～20min, then enters
Row cast.
7. according to the casting technique of the Rare earth heat-resistant steel described in claim 3, it is characterised in that the heat treatment of foundry goods uses high temperature
Solution strengthening Quenching Treatment, solid solubility temperature 1000～1250 DEG C, solution time is pressed wall thickness dimension and is calculated, and often increases 25mm thick, protects
The temperature time increases by 0.5～2.0h, shrend after coming out of the stove.
8. according to the casting technique of the Rare earth heat-resistant steel described in claim 3, it is characterised in that high-purity lanthanum cerium selected by rare earth alloy
Rare earth alloy, rare earth element more than content 99wt%；In lanthanum cerium mischmetal alloy, lanthanum: cerium weight ratio is 1:(1～3).
9. according to the casting technique of the Rare earth heat-resistant steel described in claim 3, it is characterised in that: close by adding rare earth in bag
Gold, crystal grain thinning, refine field trash, grain size is more than 4 grades, and field trash summation is less than 3.0 grades；Rare earth pinning crystal boundary, phosphorus is common
Crystalline substance cannot segregation, reduce grain boundary oxidation, improve material against oxidative ability.
10. according to the casting technique of the Rare earth heat-resistant steel described in claim 3, it is characterised in that: by higher temperature solid solution, make
Carbide fully dissolves, it is ensured that the single fully austenitic structure of material initial structure, under arms during, carbide is in crystal boundary and border
The most again separate out, the structure stability under hot conditions is greatly improved, so that it is guaranteed that service temperature reaches 1000～1250 DEG C
Ultra-high temperature scope.
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| CN106609313A (en) * | 2017-01-24 | 2017-05-03 | 中国科学院金属研究所 | High-purity rare earth steel treatment method |
| CN108642373A (en) * | 2018-04-18 | 2018-10-12 | 江苏理工学院 | A kind of high-temperature oxidation resistant austenitic heat-resistance steel and its preparation process |
| CN110499475A (en) * | 2019-08-19 | 2019-11-26 | 广东省材料与加工研究所 | A kind of austenitic heat-resistance steel and its preparation method and application |
| CN111074049A (en) * | 2019-11-24 | 2020-04-28 | 舞阳钢铁有限责任公司 | Production process for reducing surface cracks of chromium-molybdenum alloy steel plate with high chromium content |
| CN112410664A (en) * | 2020-11-09 | 2021-02-26 | 中国科学院金属研究所 | High-strength and anti-nodule CNRE rare earth heat-resistant steel for hearth roll and preparation method thereof |
| CN112853204A (en) * | 2020-12-30 | 2021-05-28 | 唐山腾龙重型机械设备制造有限公司 | High-purity rare earth microalloying grate bar and manufacturing method thereof |
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| CN114107803A (en) * | 2021-10-22 | 2022-03-01 | 中国科学院金属研究所 | High-temperature wear-resistant CNRE rare earth heat-resistant steel for power station fluidized bed hood and preparation method thereof |
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