CN109207845A - A kind of ultra supercritical heat-resisting steel sheet and plate and its manufacturing method - Google Patents
A kind of ultra supercritical heat-resisting steel sheet and plate and its manufacturing method Download PDFInfo
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- CN109207845A CN109207845A CN201710526114.3A CN201710526114A CN109207845A CN 109207845 A CN109207845 A CN 109207845A CN 201710526114 A CN201710526114 A CN 201710526114A CN 109207845 A CN109207845 A CN 109207845A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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Abstract
A kind of ultra supercritical heat-resisting steel sheet and plate and its manufacturing method, chemical component weight percentage are as follows: C 0.07~0.13%, Si 0.20~0.50%, Mn 0.30~0.60%, P≤0.020%, S≤0.010%, Cr 8.00~9.50%, Mo 0.30~0.60%, W 1.50~2.00%, V 0.15~0.25%, Nb0.050~0.100%, N 0.030~0.070%, B 0.0010~0.0060%, remaining is Fe and inevitable impurity.Steel plate of the present invention is with steam corrosion resistant to high temperatures is had excellent performance, mechanical behavior under high temperature is excellent, high-temerature creep creep rupture strength is excellent, yield strength Rp0.2 >=500MPa, tensile strength Rm700-900MPa, elongation percentage A50mm >=18%, ballistic work AKV (20 DEG C) >=27J, can satisfy that heat power station capacity is enlarged, more efficient, the higher demand to steel material of pressure.
Description
Technical field
The present invention relates to heat-resisting steel making, in particular to a kind of ultra supercritical heat-resisting steel sheet and plate and its manufacturing method.
Background technique
Supercritical steel belongs to martensite type refractory steel, it has good mechanical behavior under high temperature, steam corrosion resistant to high temperatures
Property and higher high-temerature creep creep rupture strength, it is that China newly builds a power station the head of large capacity Subcritical Units and supercritical unit
Material selection, it, more resistant to high temperature, is applied more broadly in Power Plant Boiler Trade than common heat-resisting steel sheet and plate.
In order to meet the harsh application environment of thermal power generation steam turbine high temperature sulfur-bearing, it may be considered that add antioxygen to steel grade
Change the alloying element with corrosion and heat resistant, such as Cr, W, Nb, Mo, V.Then to consider the casting performance and hot-working character of product
And the ways and means of heat treatment, it is ensured that the manufacturability of new product and superior property.
Existing ultra supercritical composition of steel and process characteristic:
The ingredient design of ultra supercritical heat resisting steel has following features: suitably reducing C content, improves the weldability of metal
Energy.By improving the constituent contents such as Cr, W, Nb, Mo, V, the harden ability of metal is improved, so that the martensite formed after tempering is more
Add that small, width of sheet is smaller.After 730-760 DEG C of tempering, the carbon nitridation of the V and Nb of Cr23C6 and Dispersed precipitate is precipitated
The dislocation density and high temperature creep strength of crystal grain greatly improved in object, so that ultra supercritical heat-resisting steel sheet and plate is than super-pressure heat resisting steel
Plate is compared, and is increased to 600 DEG C from 535 DEG C using temperature.
Ultra supercritical heat resisting steel has following process characteristic: thermal conductivity is excellent under high temperature, is conducive to hot procedure blank temperature
The uniformity of degree, at 1200 DEG C of heating temperature, carbide can sufficiently be dissolved into austenite grain at high temperature.Under high temperature
The yield strength ratio high 20-50MPa of common heat resisting steel, it requires and deformed with small deformation multi-pass.Ultra supercritical heat resisting steel
Plate compares common heat-resisting steel sheet and plate, and the carbonitride of a large amount of Dispersed precipitate W, V and Nb can be precipitated by being tempered, improve heat-resisting
The intensity index of steel plate, tensile strength are increased to the 700- of ultra supercritical heat-resisting steel sheet and plate from the 480-500MPa of common heat-resisting steel sheet and plate
740MPa, yield strength are increased to the 500-540MPa of ultra supercritical heat-resisting steel sheet and plate from the 360-370MPa of common heat-resisting steel sheet and plate.
Heat-resisting steel sheet and plate of the invention is used on extra-supercritical unit, generating efficiency up to 48%, compared to super-pressure unit 35% substantially
It improves.Effect also greatly improved than every degree electric consumption standard coal 360g of super-pressure unit in every degree electric consumption standard coal 256g
Rate reduces energy consumption.
Summary of the invention
The purpose of the present invention is to provide a kind of ultra supercritical heat-resisting steel sheet and plate and its manufacturing methods, with steam resistant to high temperatures
Corrosive nature is excellent, mechanical behavior under high temperature is excellent, high-temerature creep creep rupture strength is excellent, yield strength Rp0.2 >=500MPa, tension
Intensity Rm 700-900MPa, elongation percentage A50mm >=18%, ballistic work AKV (20 DEG C) >=27J can satisfy heat power station
Capacity is enlarged, more efficient, the higher demand to steel material of pressure.
In order to achieve the above objectives, the technical scheme is that
A kind of ultra supercritical heat-resisting steel sheet and plate, chemical component weight percentage are as follows: C 0.07~0.13%, Si 0.20~
0.50%, Mn 0.30~0.60%, P≤0.020%, S≤0.010%, Ni≤0.40%, Cr 8.00~9.50%, Mo
0.30~0.60%, W 1.50~2.00%, V 0.15~0.25%, Nb 0.050~0.100%, N 0.030~
0.070%, B 0.0010~0.0060%, Al≤0.040%, remaining is Fe and inevitable impurity.
Heat-resisting steel sheet and plate of the present invention yield strength Rp0.2 >=500MPa (and common heat-resisting steel sheet and plate only >=
250MPa), tensile strength Rm700~900MPa (and common heat-resisting steel sheet and plate only >=500MPa), elongation percentage A50mm >=18%,
Ballistic work AKV (20 DEG C) >=27J.
Heat-resisting steel sheet and plate of the present invention can bear steam pressure range 30-40MPa, the temperature range 600-650 that can be born
DEG C (and common only 450-500 DEG C of heat-resisting steel sheet and plate), steel plate tensile strength index reaches 700-900MPa.
In present component design, C content is reduced, the welding performance of metal greatly improved.Contained by improving Cr, Mo
Amount, constituent contents, the harden ability of metal such as addition W, V greatly improve, and tempered martensite is more small, width of sheet is smaller.Through
After crossing 730-760 DEG C of tempering, Cr is precipitated23C6With the carbonitride of the V and Nb of Dispersed precipitate, the dislocation that crystal grain greatly improved is close
Degree and high temperature creep strength are improved using temperature from 535 DEG C so that ultra supercritical heat-resisting steel sheet and plate is compared than super-pressure heat-resisting steel sheet and plate
To 600 DEG C.
The manufacturing method of ultra supercritical heat-resisting steel sheet and plate of the present invention comprising following steps:
1) it smelts, cast
It is smelted according to mentioned component, is casting continuously to form base；
Pressure 55.5-66.7Pa range of lower retention time 15-30min, can greatly improve the pure of molten steel in vacuum processing
Cleanliness, testing result show the ultra supercritical heat-resisting steel sheet and plate by vacuum processing, and the control of [o] content reaches 10-20ppm, [H]
Content range is controlled in 1-2ppm；Continuous casting is produced using vertical casting machine, it is ensured that casting process whole process argon gas protects not air-breathing, steel
Water degree of purity is high；Target superheat degree is controlled at 20-30 DEG C, and casting speed control is in 0.61-0.67m/min, it is ensured that liquid fluctuating
Steadily, casting billet surface is smooth, and quality is good；
2) slab is annealed
Continuous casting billet cuts after the completion hot charging annealing furnace immediately, and 300-600 DEG C of annealing furnace to warm material feeding；Heating furnace heating rate
30-50 DEG C/h, 860-900 DEG C and soaking time 24-30 hours of annealing temperature, it can sufficiently discharge and eliminate the heat of slab
Stress and transformation stress avoid slab that crack defect occurs；
3) heating of plate blank
Ensure to be heated evenly for slab, it is proposed that calculated according to following formula, t=α * K*D, unit, point
Clock；Wherein α is heating coefficient, and steel of the present invention is determined as 1.4-1.6, and K is slab thickness, and unit mm, D are shove charge conditional coefficient,
According to the shove charge condition of stepping furnace, 0.9-1.1 can be set as；
When α value 1.5, D value 1.0, t=1.5*K (K is slab thickness, unit mm) minute；
It when continuous casting steel billet is with a thickness of 200mm, is obtained heating time >=300 minutes according to above-mentioned formula, zone of reasonableness is
300-330 minutes, 1190-1210 DEG C of slab soaking temperature range；
4) it rolls
Start rolling temperature range: 1050-1200 DEG C, finishing temperature range: 800-1050 DEG C；
5) normalizing
Steel plate normalizing heat treatment, 1050-1070 DEG C of temperature；
Steel plate time inside furnace:
≤ 12mm steel plate: T=2.8-3.2*H；
> 12mm steel plate: T=1.8-2.2*H；
Wherein, T, time inside furnace, unit minute；H steel plate thickness, unit mm；Steel plate come out of the stove into air-cooled room it is air-cooled, t=
0.9-1.1*H, H steel plate thickness, unit mm；T, air-cooled time minute；
6) steel plate is tempered
Control for Kiln Temperature requirement: 790-810 DEG C；
Steel plate time inside furnace:
≤ 12mm steel plate: T=4.8-5.2*H；
> 12mm steel plate: T=3.8-4.2*H；
Wherein, T, time inside furnace, unit minute；H steel plate thickness, unit mm；Steel plate, which is come out of the stove, uses air-cooled room air-cooled, t=
0.4-0.6*H, H steel plate thickness, unit mm；T, air-cooled time minute.
The present invention devises the reasonable technological process of production, devises the reasonable smelting of maturation, steel billet is heat-treated, heat adds
The technological parameter that work, steel plate are heat-treated.It is important that these design passed through practice verifying, the product surface quality of production,
Performance meets the requirement of technical conditions.
Beneficial effects of the present invention:
1. slab produced by the invention effectively releases martensite transformation stress by thermal cutting and heat treatment,
Steel plate stress cracking is avoided, slab quality is excellent.
2. plate size tolerance, template, straightness that the present invention rolls are all satisfied national and foreign standards requirement, surface quality is good
It is good.
3. steel plate produced by the invention is after implementing normalizing+tempering, mechanical performance index is excellent, meets product technology and wants
Summation user usage requirements.Technical indicator such as following table.
Detailed description of the invention
Fig. 1 is ultra supercritical slab heat treatment cycle curve figure of the present invention.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention will be further described.
Ingredient of the embodiment of the present invention is referring to table 1, and technique of the embodiment of the present invention is referring to table 2 and Fig. 1, performance of the embodiment of the present invention
Parameter is referring to table 3.
The technological process of production of the present invention is summarized as follows:
EAF → LF → VD → continuous casting steel billet → slab earnestly → slab annealing → heating of plate blank → rolling → normalizing → tempering
→ ball blast → ultrasonic examination → surface of steel plate, size, outline inspection → warehousing finished products.
。
Claims (7)
1. a kind of ultra supercritical heat-resisting steel sheet and plate, chemical component weight percentage are as follows:
C 0.07~0.13%,
Si 0.20~0.50%,
Mn 0.30~0.60%,
P≤0.020%,
S≤0.010%,
Ni≤0.40%,
Cr 8.00~9.50%,
Mo 0.30~0.60%,
W 1.50~2.00%,
V 0.15~0.25%,
Nb 0.050~0.100%,
N 0.030~0.070%,
B 0.0010~0.0060%,
Al≤0.040%,
Remaining is Fe and inevitable impurity.
2. ultra supercritical heat-resisting steel sheet and plate as described in claim 1, characterized in that the yield strength Rp of the heat-resisting steel sheet and plate0.2≥
500MPa, tensile strength 700~900MPa of Rm, elongation percentage A50mm >=18%, ballistic work AKV (20 DEG C) >=27J.
3. ultra supercritical heat-resisting steel sheet and plate as described in claim 1, characterized in that the heat-resisting steel sheet and plate can bear steam pressure model
30-40MPa is enclosed, 600-650 DEG C of the temperature range that can be born, steel plate tensile strength index reaches 700-900MPa.
4. the manufacturing method of ultra supercritical heat-resisting steel sheet and plate as described in claim 1, characterized in that include the following steps:
1) it smelts, cast
Ingredient described in accordance with the claim 1 is smelted, and base is casting continuously to form；
Pressure 55.5-66.7Pa range of lower retention time 15-30min in vacuum processing, [o] content are controlled in 10-20ppm, [H]
Content range is controlled in 1-2ppm；
Continuous casting uses vertical casting machine, and target superheat degree is controlled at 20-30 DEG C, and casting speed control is in 0.61-0.67m/min；
2) slab is annealed
Continuous casting billet cuts after the completion hot charging annealing furnace immediately, and 300-600 DEG C of annealing furnace to warm material feeding；Heating furnace heating rate 30-
50 DEG C/h, 860-900 DEG C and soaking time 24-30 hours of annealing temperature；
3) heating of plate blank
Slab heating time t=α * K*D, unit, minute；Wherein α is heating coefficient, and 1.4-1.6, K are slab thickness, unit
Mm, D are shove charge conditional coefficient, are set as 0.9-1.1；Heating time >=300 minute, 1190-1210 DEG C of slab soaking temperature；
4) it rolls
Start rolling temperature range: 1050-1200 DEG C, finishing temperature range: 800-1050 DEG C；
5) normalizing
Steel plate normalizing heat treatment, 1050-1070 DEG C of temperature；
Steel plate time inside furnace:
≤ 12mm steel plate: T=2.8-3.2*H；
> 12mm steel plate: T=1.8-2.2*H；
Wherein, T, time inside furnace, unit minute；H steel plate thickness, unit mm；Steel plate come out of the stove into air-cooled room it is air-cooled, t=0.9-
1.1*H, H steel plate thickness, unit mm；T, air-cooled time minute；
6) steel plate is tempered
Control for Kiln Temperature requirement: 790-810 DEG C；
Steel plate time inside furnace:
≤ 12mm steel plate: T=4.8-5.2*H；
> 12mm steel plate: T=3.8-4.2*H；
Wherein, T, time inside furnace, unit minute；H steel plate thickness, unit mm；Steel plate, which is come out of the stove, uses air-cooled room air-cooled, t=0.4-
0.6*H, H steel plate thickness, unit mm；T, air-cooled time minute.
5. the manufacturing method of ultra supercritical heat-resisting steel sheet and plate as claimed in claim 4, characterized in that the slab heating time is
300-330 minutes.
6. the manufacturing method of ultra supercritical heat-resisting steel sheet and plate as claimed in claim 4, characterized in that the surrender of the heat-resisting steel sheet and plate
Intensity Rp0.2 >=500MPa, tensile strength 700~900MPa of Rm, elongation percentage A50mm >=18%, ballistic work AKV (20 DEG C) >=
27J。
7. the manufacturing method of ultra supercritical heat-resisting steel sheet and plate as claimed in claim 4, characterized in that the heat-resisting steel sheet and plate can be held
By steam pressure range 30-40MPa, 600-650 DEG C of the temperature range that can be born, steel plate tensile strength index reaches 700-
900MPa。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110373527A (en) * | 2019-08-29 | 2019-10-25 | 哈尔滨汽轮机厂有限责任公司 | A kind of heat treatment method improving supercritical turbine heat resisting cast steel material creep rupture strength |
| RU2789958C1 (en) * | 2022-10-26 | 2023-02-14 | Федеральное государственное автономное образовательное учреждение высшего образования "Белгородский государственный национальный исследовательский университет" (НИУ "БелГУ") | Method for processing heat-resistant low-carbon martensitic steels |
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