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CN109594019A - A kind of 9Cr martensite heat resisting cast steel and eliminate the ferritic method of δ-in the cast steel - Google Patents

A kind of 9Cr martensite heat resisting cast steel and eliminate the ferritic method of δ-in the cast steel Download PDF

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Publication number
CN109594019A
CN109594019A CN201811606563.XA CN201811606563A CN109594019A CN 109594019 A CN109594019 A CN 109594019A CN 201811606563 A CN201811606563 A CN 201811606563A CN 109594019 A CN109594019 A CN 109594019A
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cast steel
hours
heat
cooled
room temperature
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宁保群
任楷
李苗苗
董治中
王志奇
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Tianjin University of Technology
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Tianjin University of Technology
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The present invention relates to a kind of 9Cr martensite heat resisting cast steel and the ferritic method of δ-in the cast steel is eliminated, the performances such as martensite heat-resistant steel intensity, hardness and impact flexibility can be effectively improved.Method is as-cast martensitic heat resisting steel to be first heated to 1150 DEG C~1200 DEG C from room temperature through homogenizing anneal, heat preservation was air-cooled to room temperature after 2~10 hours；Then normalizing is heated to 1050 DEG C~1100 DEG C, and heat preservation was air-cooled to room temperature after 2~5 hours；Finally tempering is heated to 700 DEG C~760 DEG C, and heat preservation was air-cooled to room temperature after 3~10 hours.Heating rate is respectively less than 10 DEG C/min.The method of the present invention novel and unique can effectively eliminate in 9Cr martensite heat resisting casting there are a large amount of δ-ferritic phases, avoid due to causing heavy castings directly to scrap situation there are δ-ferrite, reduce manufacturing cost, improve economic benefit.

Description

A kind of 9Cr martensite heat resisting cast steel and eliminate the ferritic method of δ-in the cast steel
Technical field
The present invention relates to heat treatments, especially for containing there are δ-in the more 9Cr martensite heat resisting cast steel of alloy species The elimination of ferritic phase.
Background technique
Coal fired power generation is the main force of China's power generation, at present or in suitable period from now on, still occupies annual electricity generating capacity 70%.Sophistication improves the efficiency of coal unit, and realization is energy-saving, and reduce environmental pollution always China's electric power The important and urgent task of industrial development.For energy saving and protection environment, various countries will exert exploitation can be effective Raising utilization rate of coal and the thermal efficiency ultra supercritical power generation technology in China.Ultra supercritical power generation green technology, it has also become China changes It builds or introduces technology building the preferred of generating set.
9Cr martensite heat-resistant steel becomes power station because of physical properties such as its good heat resistance and lower thermal expansion coefficients The most key heat proof material in unit steel.It is good comprehensive to obtain the 9Cr martensite heat-resistant steel of 590~620 DEG C of grades Performance is closed, the more alloying element of compound addition in Chang Gang, but the Deng Huishi austenite one phase area Cr, W, Mo reduces, δ-iron element Body phase region expands, and leads to δ-ferrite easily occur in heavy casting and forging tissue in production.δ-ferrite can cause alloy Toughness is insufficient, and fracture toughness is significantly reduced with the ferritic increase of δ-in tissue.Generally, 9Cr martensite heat-resistant steel tissue In avoid δ-ferrite to generate as far as possible, control δ-ferrite volume fraction no more than 3%.
Currently, research all concentrates on the proportion of adjustment alloying component mostly, to avoid the generation of δ-ferritic phase.The present invention For excess δ-ferritic martensite heat resisting cast steel is contained, reasonable heat treatment process is formulated, guarantees that heating temperature rests on Austenite one phase area effectively eliminates δ-ferrite in 9Cr martensite heat resisting casting to avoid the ferritic generation of δ-in tissue Phase.
Summary of the invention
The present invention is based on austenite transition mechanisms to realize 9Cr horse by studying and defining reasonable heat treatment process parameter In family name's body heat resisting cast steel δ-ferrite after austenitizing to the process of martensite transfor mation, to reach heat-resisting to 9Cr martensite δ-ferritic phase effectively eliminates in Cast Steels.
The specific technical solution of the present invention is as follows:
A kind of 9Cr martensite heat resisting cast steel, main alloy element and its mass percent are as follows:
C:0.08%~0.25%；Si:0.1%~0.4%；Mn:0.5%~1.2%；Cr:8.5%~12.5%；Mo: 0.8%~3.5%；Co:0.5%~1.5%；V:0.05%~0.4%；Ni:0.151%~0.179%；Nb:0.02%~ 0.8%；N:0.01%~0.08%；B:0.01%~0.06%；Fe: surplus.
A kind of to effectively eliminate δ-ferritic phase heat treatment process in 9Cr martensite heat resisting casting, its step are as follows:
As-cast martensitic heat resisting steel is first heated to 1150 DEG C~1200 DEG C from room temperature through homogenizing anneal, heat preservation 2~10 It is cooled to room temperature after hour；Then normalizing is heated to 1050 DEG C~1100 DEG C, and heat preservation is cooled to room temperature after 2~5 hours；Finally return Fire is heated to 700 DEG C~760 DEG C, and heat preservation is cooled to room temperature after 3~7 hours.
It is preferred that each step-up temperature rate is less than 10 DEG C/min.
It is preferred that each stage type of cooling is air-cooled.
The ferritic generation of δ-is related with the Alfer element being added into 9Cr martensite heat resisting cast steel, and alloy The addition of element can make the position of the steel grade transition curve change, and austenite phase field is caused to reduce.Therefore it is suitable to set Can heat treatment temperature be the key that reach austenite one phase area.The present invention effectively eliminates after above-mentioned heat treatment process δ-ferritic phase in martensitic cast steel, δ-ferrite in cast steel within sweep of the eye less than 3%, are meeting using standard entirely.
The advantages of the present invention:
The present invention by formulating reasonable heat treatment process early period, can to δ-ferritic phase in martensite heat resisting cast steel into Row effectively eliminates, and the performances such as intensity, the hardness especially impact flexibility of steel is made to be improved, and has reached using standard, has kept away Exempt to lead to the case where scrapping because of δ-overproofed ferrite content, has reduced manufacturing cost.
Detailed description of the invention
Fig. 1 is the heat treatment cycle curve of the ferritic martensite heat resisting cast steel containing δ-.
Fig. 2 is the metallographic structure photo of each heat treatment stages in case 1: A is the metallographic structure photo of as cast condition, B first Metallographic structure photo after the heat treatment of stage homogenizing anneal, C are the metallographic structure photo after second stage normalizing heat treatment, D For the metallographic structure photo after phase III tempering heat treatment.
Fig. 3 is the metallographic structure photo of each heat treatment stages in case 2: A is the metallographic structure photo of as cast condition, B first Metallographic structure photo after the heat treatment of stage homogenizing anneal, C are the metallographic structure photo after second stage normalizing heat treatment, D For the metallographic structure photo after phase III tempering heat treatment.
Fig. 4 is the metallographic structure photo of each heat treatment stages in case 3: A is the metallographic structure photo of as cast condition, B first Metallographic structure photo after the heat treatment of stage homogenizing anneal, C are the metallographic structure photo after second stage normalizing heat treatment, D For the metallographic structure photo after phase III tempering heat treatment.
Specific embodiment
Attached drawing 1 gives the heat treatment cycle curve of the ferritic martensite heat resisting cast steel of the invention containing δ-, work of the present invention Skill is that as-cast martensitic heat resisting steel is first heated to 1150 DEG C~1200 DEG C from room temperature through homogenizing anneal, keeps the temperature 2~10 hours After be cooled to room temperature；Then normalizing is heated to 1050 DEG C~1100 DEG C, and heat preservation is cooled to room temperature after 2~5 hours；Finally tempering adds To 700 DEG C~760 DEG C, heat preservation is cooled to room temperature heat after 3~7 hours.Each step-up temperature rate is respectively less than 10 in present invention process DEG C/min, each stage type of cooling is air-cooled.Technical solution of the present invention is done furtherly below by specific embodiment It is bright.
Embodiment 1:
For a kind of 9Cr martensite heat resisting cast steel, the chemical component and its quality percentage of martensite heat resisting cast steel each element Than are as follows: C:0.136%；Si:0.267%；Mn:0.82%；Cr:9.33%；Mo:1.40%；Co:0.87%；V:0.183%； Ni:0.151%；Nb:0.054%；N:0.040%；B:0.017%；Fe: surplus.The ingredient martensite heat resisting cast steel as cast condition Tissue is apparent martensite and δ-ferrite dual phase tissue in organizing as shown in fig. 2, in steel.It is calculated by gridding method, δ-ferrite content about 18%.Its ballistic work is 13J.
The heat treatment method of the present embodiment martensite heat resisting cast steel includes homogenizing anneal, normalizing, tempering, concrete technology step It is rapid as described below:
(1) it homogenizing anneal process: 1180 DEG C of heating temperature, soaking time 5 hours, comes out of the stove air-cooled.
(2) it normalizing process: 1080 DEG C of heating temperature, soaking time 2 hours, comes out of the stove air-cooled.
(3) it tempering process: 700 DEG C of heating temperature, soaking time 5 hours, comes out of the stove air-cooled.
Metallographic structure is as shown in attached drawing 2B, 2C, 2D after each phase heat treatment, homogenizing anneal (1180 DEG C of -5h- are air-cooled) Afterwards, tissue becomes uniformly in steel, and δ-ferritic structure substantially reduces in cast steel, and the strip, island of disperse is big in as-cast structure Block δ-ferritic transformation is a small amount of filament shape, dotted δ-ferrite.Normalizing (1080 DEG C of -2h- are air-cooled)+tempering (700 DEG C of -2h- It is air-cooled) after, exist within sweep of the eye without obvious δ-ferritic phase entirely, ballistic work is promoted to 29J.
Embodiment 2:
For a kind of 9Cr martensite heat resisting cast steel, the chemical component and its quality percentage of martensite heat resisting cast steel each element Than are as follows: C:0.114%；Si:0.267%；Mn:0.80%；Cr:9.51%；Mo:1.50%；Co:0.87%；V:0.304%； Ni:0.157%；Nb:0.06%；N:0.038%；B:0.017%；Fe: surplus.The ingredient martensite heat resisting cast steel as cast condition group Knit as shown in fig. 3 a, in steel tissue in be apparent martensite and δ-ferrite dual phase tissue, ballistic work 15J.Pass through Gridding method calculates, and δ-ferrite content is about 13%.
The heat treatment method of the present embodiment martensite heat resisting cast steel includes homogenizing anneal, normalizing, tempering, concrete technology step It is rapid as described below:
(1) it homogenizing anneal process: 1180 DEG C of heating temperature, soaking time 5 hours, comes out of the stove air-cooled.
(2) it normalizing process: 1080 DEG C of heating temperature, soaking time 2 hours, comes out of the stove air-cooled.
(3) it tempering process: 700 DEG C of heating temperature, soaking time 5 hours, comes out of the stove air-cooled.
Metallographic structure is as shown in attached drawing 3B, 3C, 3D after each phase heat treatment, through homogenizing anneal (1180 DEG C of -5h- are air-cooled) After+normalizing (1080 DEG C of -2h- are air-cooled)+tempering (700 DEG C of -5h- are air-cooled), ballistic work is promoted to 28J.Observe full field range Interior δ-ferritic phase volume fraction is 1.02% or so, meets the use standard less than 3%.
Embodiment 3:
For a kind of 9Cr martensite heat resisting cast steel, the chemical component and its quality percentage of martensite heat resisting cast steel each element Than are as follows: C:0.121%；Si:0.287%；Mn:0.87%；Cr:9.27%；Mo:1.40%；Co:0.87%；V:0.247%； Ni:0.179%；N:0.028%；Nb:0.065%；B:0.017%；Fe: surplus.The ingredient martensite heat resisting cast steel as cast condition Tissue is apparent martensite and δ-ferrite dual phase tissue in organizing as shown in fig 4, in steel.It is calculated by gridding method, δ-ferrite content is about 19%.Its ballistic work is 19J.
The heat treatment method of the present embodiment martensite heat resisting cast steel includes homogenizing anneal, normalizing, tempering, concrete technology step It is rapid as described below:
(1) it homogenizing anneal process: 1180 DEG C of heating temperature, soaking time 10 hours, comes out of the stove air-cooled.
(2) it normalizing process: 1080 DEG C of heating temperature, soaking time 2 hours, comes out of the stove air-cooled.
(3) it tempering process: 700 DEG C of heating temperature, soaking time 5 hours, comes out of the stove air-cooled.
Metallographic structure is as shown in attached drawing 4B, 4C, 4D after each phase heat treatment, and through homogenizing anneal, (1180 DEG C of -10h- are empty It is cold) after+normalizing (1080 DEG C of -2h- are air-cooled)+tempering (700 DEG C of -5h- are air-cooled), ballistic work is promoted to 33J.Observe full visual field model Enclosing interior δ-ferritic phase volume fraction is 0.78% or so, meets the use standard less than 3%.

Claims (9)

1.一种9Cr马氏体耐热铸钢，其特征在于：所述耐热铸钢的合金成分及其质量百分比为：C：0.08％～0.25％；Si：0.1％～0.4％；Mn：0.5％～1.2％；Cr：8.5％～12.5％；Mo：0.8％～3.5％；Co：0.5％～1.5％；V：0.05％～0.4％；Ni：0.151％～0.179％；Nb：0.02％～0.8％；N：0.01％～0.08％；B：0.01％～0.06％；Fe：余量。1. A 9Cr martensitic heat-resistant cast steel, characterized in that: the alloy composition of the heat-resistant cast steel and its mass percentage are: C: 0.08% to 0.25%; Si: 0.1% to 0.4%; Mn: 0.5%～1.2%; Cr: 8.5%～12.5%; Mo: 0.8%～3.5%; Co: 0.5%～1.5%; V: 0.05%～0.4%; Ni: 0.151%～0.179%; Nb: 0.02% ~0.8%; N: 0.01% to 0.08%; B: 0.01% to 0.06%; Fe: balance. 2.如权利要求1所述的9Cr马氏体耐热铸钢，其特征在于：所述耐热铸钢的合金成分及其质量百分比为：C：0.136％；Si：0.267％；Mn：0.82％；Cr：9.33％；Mo：1.40％；Co：0.87％；V：0.183％；Ni：0.151％；Nb：0.054％；N：0.040％；B：0.017％；Fe：余量。2. The 9Cr martensitic heat-resistant cast steel according to claim 1, characterized in that: the alloy composition of the heat-resistant cast steel and its mass percentage are: C: 0.136%; Si: 0.267%; Mn: 0.82 %; Cr: 9.33%; Mo: 1.40%; Co: 0.87%; V: 0.183%; Ni: 0.151%; Nb: 0.054%; N: 0.040%; B: 0.017%; 3.如权利要求1所述的9Cr马氏体耐热铸钢，其特征在于：所述耐热铸钢的合金成分及其质量百分比为：C：0.114％；Si：0.267％；Mn：0.80％；Cr：9.51％；Mo：1.50％；Co：0.87％；V：0.304％；Ni：0.157％；Nb：0.06％；N：0.038％；B：0.017％；Fe：余量。3. The 9Cr martensitic heat-resistant cast steel according to claim 1, characterized in that: the alloy composition of the heat-resistant cast steel and its mass percentage are: C: 0.114%; Si: 0.267%; Mn: 0.80 %; Cr: 9.51%; Mo: 1.50%; Co: 0.87%; V: 0.304%; Ni: 0.157%; Nb: 0.06%; N: 0.038%; B: 0.017%; 4.如权利要求1所述的9Cr马氏体耐热铸钢，其特征在于：所述耐热铸钢的合金成分及其质量百分比为：C：0.121％；Si：0.287％；Mn：0.87％；Cr：9.27％；Mo：1.40％；Co：0.87％；V：0.247％；Ni：0.179％；N：0.028％；Nb：0.065％；B：0.017％；Fe：余量。4. The 9Cr martensitic heat-resistant cast steel according to claim 1, characterized in that: the alloy composition of the heat-resistant cast steel and its mass percentage are: C: 0.121%; Si: 0.287%; Mn: 0.87 %; Cr: 9.27%; Mo: 1.40%; Co: 0.87%; V: 0.247%; Ni: 0.179%; N: 0.028%; 5.一种消除权利要求1-4所述的9Cr马氏体耐热铸钢中δ-铁素体相的方法，其特征在于包括以下步骤：5. a method for eliminating δ-ferrite phase in the 9Cr martensitic heat-resistant cast steel described in claim 1-4, is characterized in that comprising the following steps: 将铸态马氏体耐热钢先经均质化退火从室温加热至1150℃～1200℃，保温2～10小时后冷却至室温；然后正火加热至1050℃～1100℃，保温2～5小时后冷却至室温；最后回火加热至700℃～760℃，保温3～7小时后冷却至室温。The as-cast martensitic heat-resistant steel is first heated to 1150℃～1200℃ from room temperature by homogenization annealing, kept for 2～10 hours and then cooled to room temperature; then normalized and heated to 1050℃～1100℃, kept at 2～5 After 1 hour, it is cooled to room temperature; finally, it is tempered and heated to 700° C. to 760° C., kept for 3 to 7 hours, and then cooled to room temperature. 6.如权利要求5所述的方法，其特征在于：均质化退火工序的加热温度1180℃，保温时间5小时；正火工序中加热温度1080℃，保温时间2小时；回火工序中加热温度700℃，保温时间5小时。6. The method according to claim 5, characterized in that: the heating temperature in the homogenization annealing process is 1180 °C, and the holding time is 5 hours; the heating temperature in the normalizing process is 1080 °C, and the holding time is 2 hours; heating in the tempering process The temperature was 700°C, and the holding time was 5 hours. 7.如权利要求5所述的方法，其特征在于：均质化退火工序中加热温度1180℃，保温时间10小时；正火工序中加热温度1080℃，保温时间2小时；回火工序中加热温度700℃，保温时间5小时。7. The method according to claim 5, characterized in that: in the homogenization annealing process, the heating temperature is 1180 °C, and the holding time is 10 hours; in the normalizing process, the heating temperature is 1080 °C, and the holding time is 2 hours; in the tempering process, heating The temperature was 700°C, and the holding time was 5 hours. 8.如权利要求5-7所述的方法，其特征在于：各阶段升温速率均小于10℃/min。8. The method according to claim 5-7, wherein the heating rate of each stage is less than 10°C/min. 9.如权利要求5-7所述的方法，其特征在于：各阶段冷却方式均为空冷。9. The method according to claim 5-7, characterized in that : the cooling method of each stage is air cooling.
CN201811606563.XA 2018-12-27 2018-12-27 A kind of 9Cr martensite heat resisting cast steel and eliminate the ferritic method of δ-in the cast steel Pending CN109594019A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN118600326A (en) * 2024-08-09 2024-09-06 扬州诚德钢管有限公司 Heat-resistant steel for metal smelting equipment and preparation method thereof

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Application publication date: 20190409