CN109023063A - Apply the effective steel of small-bore high-pressure boiler and its production method at 550 DEG C - Google Patents
Apply the effective steel of small-bore high-pressure boiler and its production method at 550 DEG C Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
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Abstract
The invention discloses a kind of effective steel of small-bore high-pressure boiler and its production method applied at 550 DEG C, the effective steel chemical composition of high-pressure boiler forms and mass percentage is C:0.09~0.13%, Si:0.21~0.27%, Mn:0.55~0.60%, P≤0.02%, S≤0.01%, Cr:0.99~1.08%, Mo:0.29~0.35%, V:0.19~0.24%, Al≤0.020%, and surplus is Fe and inevitable impurity；The production method includes smelting, refining, continuous casting, slow cooling and rolling process.The effective steel of high-pressure boiler of the present invention, degree of purity is high, internal soundness is excellent, center porosity and center segregation rank≤0.5 grade, comprehensive performance is good, and five big harmful element As+Sn+Sb+Pb+Bi≤0.010% fully meet high temperature resistant, high pressure resistant, persistent request.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of effective steel of small-bore high-pressure boiler applied at 550 DEG C
And its production method.
Background technique
With the development of China's thermal power generation and the increase of energy-saving and emission-reduction pressure, each big power station is large-scale fiery in order to improve
The efficiency of motor group to improve boiler steam temperature and boiler pressure, and improves boiler steam temperature than improving boiler
Influence of the steam pressure to unit efficiency is more significant.
Since current domestic steel grade the quality such as performance of 15CrMoG, 12Cr1MoVG material and internal soundness are not achieved accordingly
Requirement, so that the wall thickness of pipeline be made to be greatly thickened, with improve boiler pressure parameter (from 14.3MPa be increased to 17.3MPa or even
26.5MPa) improve unit efficiency.High-pressure boiler tube is mainly used to manufacture superheater tube, the reheating of high pressure and superpressure boiler
Device pipe, gas-guide tube, main steam pipe etc..Since supercritical, high pressure boiler tube steel use environment is severe, it is desirable that have more good
Mechanical behavior under high temperature, structure stability and anticorrosive and oxidability, since the product alloy content is high, carbon content is located at packet
Crystalline region, production difficulty are big.
Therefore, current China most distinct issues are to solve dosage maximum, the highest high temperature and pressure heat resisting pipe of difficulty
Production and supply problem.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of effective steel of small-bore high-pressure boiler applied at 550 DEG C；Together
When the present invention also provides a kind of production methods applied in 550 DEG C of the effective steel of small-bore high-pressure boiler.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of small-bore height applied at 550 DEG C
Boiler tube steel is pressed, the effective steel chemical composition of high-pressure boiler forms and its mass percentage are as follows: C:0.09~0.13%,
Si:0.21~0.27%, Mn:0.55~0.60%, P≤0.020%, S≤0.010%, Cr:0.99~1.08%, Mo:0.29~
0.35%, V:0.19~0.24%, Al≤0.020%, surplus are Fe and inevitable impurity.
The effective steel of high-pressure boiler of the present invention: As≤0.010%, Sn≤0.010%, Pb≤0.010%, Sb≤0.010%,
Bi≤0.010%, O≤15ppm, N≤60ppm, H≤2.0ppm, As+Sn+Sb+Pb+Bi≤0.010%.
The effective steel specification of high-pressure boiler of the present invention is 50~90mm of φ.
The present invention also provides a kind of production method applied in 550 DEG C of the effective steel of small-bore high-pressure boiler, the lifes
Production method includes smelting, refining, continuous casting, slow cooling and rolling process；The refining procedure, at LF refining+RH vacuum outgas
Reason；The rolling process rolls two igneous materials, and split rolling method start rolling temperature is 1050~1100 DEG C, rolling bar start rolling temperature
It is 970~1020 DEG C.
Refining procedure of the present invention, using LF refining+RH Fruit storage, LF refining furnace slag charge and fine tuning ingredient one
It is secondary in place, process nitrogen pick-up≤10ppm, LF basicity of slag 3.0~3.5；RH refining vacuum degree≤67Pa, guarantor's vacuum time >=
Molten steel is quiet after the broken sky of 10min, RH vacuum blows the time >=15min.
Rolling process of the present invention rolls two igneous materials, i.e. 280mm*380mm continuous casting square base split rolling method is at 150mm*
150mm square steel, is then rolled into bar for 150mm*150mm square steel, sufficiently makes up component segregation caused by high alloy；Cogging makes
With universal mill by 280mm*380mm continuous casting square base split rolling method at 150mm*150mm square steel, split rolling method heating furnace preheating section
Temperature is 500~800 DEG C, and soaking section temperature is 1150~1200 DEG C, and start rolling temperature is 1050~1100 DEG C.
Rolling process of the present invention, rolling bar, heating furnace preheating section temperature are 500~720 DEG C, and soaking section temperature is
1070~1120 DEG C, start rolling temperature is 970~1020 DEG C.
Rolling process of the present invention, two igneous materials heat the residual oxygen of furnace atmosphere, and than control, 3~6%, dephosphorization hydraulic pressure is equal
>=22MPa guarantees that casting billet surface scale removal effect is good, meets the effective steel surface requirement of high-pressure boiler.
Self-produced steel scrap, scrap ratio≤9% is added using 120 tons of oxygen top-blown converters in smelting procedure of the present invention；Control
Converter terminal O≤600ppm, strict control five-harmful elements；3min starts Argon before tapping, and aluminum shot is added in sequence when tapping 1/4
0.9~1.2kg/t steel, synthetic slag 1.1~1.3kg/t steel, lime 1.5~2.0kg/t steel；Double pushing off the slag operations, the lower quantity of slag≤
1.5kg/t steel.
Continuous casting working procedure of the present invention, using large square bland continuous-casting machine, crystallizer section is 280mm*380mm, crystallizer electricity
Magnetic stirs I:310~330 A, f:2.0~3.0 Hz；Dynamic soft-reduction uses MC mode, and weigh 0.60~0.65m/ of pulling rate degree
Min, low overheat whole process protection are poured, and at 15~35 DEG C, middle wrap determines hydrogen for average degree of superheat control in middle packet, and hydrogen content≤
2.0ppm。
Slow cooling operation of the present invention enters and cheats temperature >=500 DEG C using entering to cheat slow cooling, slow cooling time >=48h, out hole temperature
≤ 100 DEG C of degree
A kind of effective steel product canonical reference GB/T5130 of small-bore high-pressure boiler applied at 550 DEG C of the present invention；Product low power
Tissue grading refers to GB/T226；Product non-metallic inclusion level reference GB10561；Product inspection method canonical reference YB/T
5137。
The beneficial effects of adopting the technical scheme are that the 1, present invention is designed by reasonable ingredient, produce
Using double refining treatments, realization is low to be mingled with controlled level, improves material anti-fatigue performance, meets High pressure boiler steel needs.2,
The present invention uses two igneous materials, sufficiently makes up component segregation caused by high alloy, improves steel internal quality control.3, this hair
Bright rolling heating cycle takes oxidizing atmosphere control, improves steel alloy scale removal effect.4, high-pressure boiler tube produced by the invention
With steel, degree of purity is high, internal soundness is excellent, center porosity and center segregation rank≤0.5 grade, comprehensive performance is good, and five is big
Harmful element As+Sn+Sb+Pb+Bi≤0.010% fully meets the effective steel high temperature resistant of high-pressure boiler, high pressure resistant, persistence etc. and wants
It asks.
Specific embodiment
Present invention will be explained in further detail combined with specific embodiments below.
Embodiment 1
It is φ 80mm size round steel, chemical component composition that the present embodiment, which is applied in 550 DEG C of the effective steel of small-bore high-pressure boiler,
And mass percentage is shown in Table 1；As, Sn, Sb, Pb, Bi five-harmful elements content are shown in Table 2；O, N, H gas content are shown in Table 3.
The present embodiment is applied to be included smelting, refining, connects in the production method of 550 DEG C of the effective steel of small-bore high-pressure boiler
Casting, slow cooling and rolling process, specific process step are as described below:
(1) oxygen top-blown converter, scrap ratio 7.6% smelting procedure: are used；Control converter terminal O:462ppm；3min before tapping
Start Argon, tapping 1/4 when sequence be added aluminum shot 0.9kg/t steel, synthetic slag 1.2kg/t steel, lime 1.8kg/t steel；Double pushing off the slag
Operation, lower quantity of slag 1.3kg/t steel；
(2) LF refining+RH Fruit storage, LF refining furnace slag charge and fine tuning ingredient one-time-reach-place, process refining procedure: are used
Nitrogen pick-up 9ppm, LF basicity of slag 3.0；RH refines vacuum degree 67Pa, protects vacuum time 11min, and molten steel is quiet after RH vacuum is broken empty blows
15min；
(3) continuous casting working procedure: use large square bland continuous-casting machine, crystallizer section be 280mm*380mm, M-EMS I=
320A,f=2.5Hz；Dynamic soft-reduction uses MC mode, horizontal pulling rate degree 0.65m/min, the casting of low overheat whole process protection, middle packet
Average 25 DEG C of the degree of superheat, middle packet determine hydrogen 0.9ppm；
(4) slow cooling operation: using to enter to cheat slow cooling, enter to cheat 530 DEG C of temperature, slow cooling time 63h, cheats 90 DEG C of temperature out；
(5) rolling process: two igneous materials of rolling；Using universal mill by 280mm*380mm continuous casting square base split rolling method at
150mm*150mm square steel, 600 DEG C of temperature of split rolling method heating furnace preheating section, 1180 DEG C of soaking section temperature, in furnace residual oxygen than 5%,
Dephosphorization hydraulic pressure 23MPa, start rolling temperature are 1060 DEG C；630 DEG C of temperature of rolling bar heating furnace preheating section, soaking section temperature 1090
DEG C, residual oxygen is than 5% in furnace, dephosphorization hydraulic pressure 23MPa, and start rolling temperature is 1010 DEG C.
The present embodiment applies 0.5 grade of the effective steel round steel finished product center porosity of small-bore high-pressure boiler at 550 DEG C, and center is inclined
0 grade of analysis, the grading of finished product macrostructure are shown in Table 4；Non-metallic inclusion rank is shown in Table 5, and round steel surface is met the requirements of the standard.
Embodiment 2
It is φ 75mm size round steel, chemical component composition that the present embodiment, which is applied in 550 DEG C of the effective steel of small-bore high-pressure boiler,
And mass percentage is shown in Table 1；As, Sn, Sb, Pb, Bi five-harmful elements content are shown in Table 2；O, N, H gas content are shown in Table 3.
The present embodiment is applied to be included smelting, refining, connects in the production method of 550 DEG C of the effective steel of small-bore high-pressure boiler
Casting, slow cooling and rolling process, specific process step are as described below:
(1) oxygen top-blown converter, scrap ratio 8% smelting procedure: are used；Control converter terminal O:503ppm；3min is opened before tapping
Beginning Argon, tapping 1/4 when sequence be added aluminum shot 1.1kg/t steel, synthetic slag 1.1kg/t steel, lime 1.6kg/t steel；Double pushing off the slag behaviour
Make, lower quantity of slag 1.2kg/t steel；
(2) LF refining+RH Fruit storage, LF refining furnace slag charge and fine tuning ingredient one-time-reach-place, process refining procedure: are used
Nitrogen pick-up 8ppm, LF basicity of slag 3.1；RH refines vacuum degree 65Pa, protects vacuum time 10min, and molten steel is quiet after RH vacuum is broken empty blows
Time 16min；
(3) continuous casting working procedure: use large square bland continuous-casting machine, crystallizer section be 280mm*380mm, M-EMS I=
325A,f=2.7Hz；Dynamic soft-reduction uses MC mode, horizontal pulling rate degree 0.65m/min, the casting of low overheat whole process protection, middle packet
Average 16 DEG C of the degree of superheat, middle packet determine hydrogen 1.5ppm；
(4) slow cooling operation: using to enter to cheat slow cooling, enter to cheat 550 DEG C of temperature, slow cooling time 65h, cheats 90 DEG C of temperature out；
(5) rolling process: two igneous materials of rolling；Using universal mill by 280mm*380mm continuous casting square base split rolling method at
150mm*150mm square steel, 600 DEG C of temperature of split rolling method heating furnace preheating section, 1180 DEG C of soaking section temperature, in furnace residual oxygen than 4%,
Dephosphorization hydraulic pressure 22MPa, start rolling temperature are 1060 DEG C；630 DEG C of temperature of rolling bar heating furnace preheating section, soaking section temperature 1090
DEG C, residual oxygen is than 4% in furnace, dephosphorization hydraulic pressure 22MPa, and start rolling temperature is 1010 DEG C.
The present embodiment applies 0.5 grade of the effective steel round steel finished product center porosity of small-bore high-pressure boiler at 550 DEG C, and center is inclined
0 grade of analysis, the grading of finished product macrostructure are shown in Table 4；Non-metallic inclusion rank is shown in Table 5, and round steel surface is met the requirements of the standard.
Embodiment 3
It is φ 65mm size round steel, chemical component composition that the present embodiment, which is applied in 550 DEG C of the effective steel of small-bore high-pressure boiler,
And mass percentage is shown in Table 1；As, Sn, Sb, Pb, Bi five-harmful elements content are shown in Table 2；O, N, H gas content are shown in Table 3.
The present embodiment is applied to be included smelting, refining, connects in the production method of 550 DEG C of the effective steel of small-bore high-pressure boiler
Casting, slow cooling and rolling process, specific process step are as described below:
(1) oxygen top-blown converter, scrap ratio 9% smelting procedure: are used；Control converter terminal O:468ppm；3min is opened before tapping
Beginning Argon, tapping 1/4 when sequence be added aluminum shot 1.0kg/t steel, synthetic slag 1.1kg/t steel, lime 1.7kg/t steel；Double pushing off the slag behaviour
Make, lower quantity of slag 1.3kg/t steel；
(2) LF refining+RH Fruit storage, LF refining furnace slag charge and fine tuning ingredient one-time-reach-place, process refining procedure: are used
Nitrogen pick-up 6ppm, LF basicity of slag 3.3；RH refines vacuum degree 62Pa, protects vacuum time 11min, and molten steel is quiet after RH vacuum is broken empty blows
Time 20min；
(3) continuous casting working procedure: use large square bland continuous-casting machine, crystallizer section be 280mm*380mm, M-EMS I=
315A,f=2.1Hz；Dynamic soft-reduction uses MC mode, horizontal pulling rate degree 0.65m/min, the casting of low overheat whole process protection, middle packet
Average 35 DEG C of the degree of superheat, middle packet determine hydrogen 1.4ppm；
(4) slow cooling operation: using to enter to cheat slow cooling, enter to cheat 520 DEG C of temperature, slow cooling time 65h, cheats 85 DEG C of temperature out；
(5) rolling process: two igneous materials of rolling；Using universal mill by 280mm*380mm continuous casting square base split rolling method at
150mm*150mm square steel, 580 DEG C of temperature of split rolling method heating furnace preheating section, 1180 DEG C of soaking section temperature, in furnace residual oxygen than 3%,
Dephosphorization hydraulic pressure 23MPa, start rolling temperature are 1090 DEG C；600 DEG C of temperature of rolling bar heating furnace preheating section, soaking section temperature 1090
DEG C, start rolling temperature is 1000 DEG C.
The present embodiment applies 0.5 grade of the effective steel round steel finished product center porosity of small-bore high-pressure boiler at 550 DEG C, and center is inclined
0 grade of analysis, the grading of finished product macrostructure are shown in Table 4；Non-metallic inclusion rank is shown in Table 5, and round steel surface is met the requirements of the standard.
Embodiment 4
It is φ 90mm size round steel, chemical component composition that the present embodiment, which is applied in 550 DEG C of the effective steel of small-bore high-pressure boiler,
And mass percentage is shown in Table 1；As, Sn, Sb, Pb, Bi five-harmful elements content are shown in Table 2；O, N, H gas content are shown in Table 3.
The present embodiment is applied to be included smelting, refining, connects in the production method of 550 DEG C of the effective steel of small-bore high-pressure boiler
Casting, slow cooling and rolling process, specific process step are as described below:
(1) oxygen top-blown converter, scrap ratio 8.6% smelting procedure: are used；Control converter terminal O:585ppm；3min before tapping
Start Argon, tapping 1/4 when sequence be added aluminum shot 1.2kg/t steel, synthetic slag 1.2kg/t steel, lime 1.7kg/t steel；Double pushing off the slag
Operation, lower quantity of slag 1.3kg/t steel；
(2) LF refining+RH Fruit storage, LF refining furnace slag charge and fine tuning ingredient one-time-reach-place, process refining procedure: are used
Nitrogen pick-up 5ppm, LF basicity of slag 3.4；RH refines vacuum degree 60Pa, protects vacuum time 13min, and molten steel is quiet after RH vacuum is broken empty blows
Time 18min；
(3) continuous casting working procedure: use large square bland continuous-casting machine, crystallizer section be 280mm*380mm, M-EMS I=
327A,f=2.2Hz；Dynamic soft-reduction uses MC mode, horizontal pulling rate degree 0.65m/min, the casting of low overheat whole process protection, middle packet
Average 22 DEG C of the degree of superheat, middle packet determine hydrogen 1.1ppm；
(4) slow cooling operation: using to enter to cheat slow cooling, enter to cheat 535 DEG C of temperature, slow cooling time 55h, cheats 95 DEG C of temperature out；
(5) rolling process: two igneous materials of rolling；Using universal mill by 280mm*380mm continuous casting square base split rolling method at
150mm*150mm square steel, 590 DEG C of temperature of split rolling method heating furnace preheating section, 1170 DEG C of soaking section temperature, in furnace residual oxygen than 5%,
Dephosphorization hydraulic pressure 22MPa, start rolling temperature are 1060 DEG C；630 DEG C of temperature of rolling bar heating furnace preheating section, soaking section temperature 1090
DEG C, residual oxygen is than 5% in furnace, dephosphorization hydraulic pressure 22MPa, and start rolling temperature is 1000 DEG C.
The present embodiment applies 0.5 grade of the effective steel round steel finished product center porosity of small-bore high-pressure boiler at 550 DEG C, and center is inclined
0 grade of analysis, the grading of finished product macrostructure are shown in Table 4；Non-metallic inclusion rank is shown in Table 5, and round steel surface is met the requirements of the standard.
Embodiment 5
It is φ 70mm size round steel, chemical component composition that the present embodiment, which is applied in 550 DEG C of the effective steel of small-bore high-pressure boiler,
And mass percentage is shown in Table 1；As, Sn, Sb, Pb, Bi five-harmful elements content are shown in Table 2；O, N, H gas content are shown in Table 3.
The effective steel production method of the big compression ratio high-pressure boiler of the present embodiment includes smelting, refining, continuous casting, slow cooling and rolling work
Sequence, specific process step are as described below:
(1) oxygen top-blown converter, scrap ratio 9% smelting procedure: are used；Control converter terminal O:400ppm；3min is opened before tapping
Beginning Argon, tapping 1/4 when sequence be added aluminum shot 0.9kg/t steel, synthetic slag 1.1kg/t steel, lime 1.6kg/t steel；Double pushing off the slag behaviour
Make, lower quantity of slag 1.4kg/t steel；
(2) LF refining+RH Fruit storage, LF refining furnace slag charge and fine tuning ingredient one-time-reach-place, process refining procedure: are used
Nitrogen pick-up 7ppm, LF basicity of slag 3.5；RH refines vacuum degree 60Pa, protects vacuum time 15min, and molten steel is quiet after RH vacuum is broken empty blows
Time 15min；
(3) continuous casting working procedure: use large square bland continuous-casting machine, crystallizer section be 280mm*380mm, M-EMS I=
322A,f=2.5Hz；Dynamic soft-reduction uses MC mode, horizontal pulling rate degree 0.65m/min, the casting of low overheat whole process protection, middle packet
Average 27 DEG C of the degree of superheat, middle packet determine hydrogen 1.2ppm；
(4) slow cooling operation: using to enter to cheat slow cooling, enter to cheat 590 DEG C of temperature, slow cooling time 72h, cheats 85 DEG C of temperature out；
(5) rolling process: two igneous materials of rolling；Using universal mill by 280mm*380mm continuous casting square base split rolling method at
150mm*150mm square steel, 590 DEG C of temperature of split rolling method heating furnace preheating section, 1180 DEG C of soaking section temperature, in furnace residual oxygen than 3%,
Dephosphorization hydraulic pressure 22MPa, start rolling temperature are 1100 DEG C；600 DEG C of temperature of rolling bar heating furnace preheating section, soaking section temperature 1090
DEG C, residual oxygen is than 3% in furnace, dephosphorization hydraulic pressure 22MPa, and start rolling temperature is 1000 DEG C.
The present embodiment applies 0.5 grade of the effective steel round steel finished product center porosity of small-bore high-pressure boiler at 550 DEG C, and center is inclined
0 grade of analysis, the grading of finished product macrostructure are shown in Table 4；Non-metallic inclusion rank is shown in Table 5, and round steel surface is met the requirements of the standard.
Embodiment 6
It is φ 50mm size round steel, chemical component composition that the present embodiment, which is applied in 550 DEG C of the effective steel of small-bore high-pressure boiler,
And mass percentage is shown in Table 1；As, Sn, Sb, Pb, Bi five-harmful elements content are shown in Table 2；O, N, H gas content are shown in Table 3.
The effective steel production method of the big compression ratio high-pressure boiler of the present embodiment includes smelting, refining, continuous casting, slow cooling and rolling work
Sequence, specific process step are as described below:
(1) oxygen top-blown converter, scrap ratio 8.2% smelting procedure: are used；Control converter terminal O:600ppm；3min before tapping
Start Argon, tapping 1/4 when sequence be added aluminum shot 1.0kg/t steel, synthetic slag 1.3kg/t steel, lime 1.5kg/t steel；Double pushing off the slag
Operation, lower quantity of slag 1.5kg/t steel；
(2) LF refining+RH Fruit storage, LF refining furnace slag charge and fine tuning ingredient one-time-reach-place, process refining procedure: are used
Nitrogen pick-up 10ppm, LF basicity of slag 3.3；RH refines vacuum degree 55Pa, protects vacuum time 20min, and molten steel is quiet after RH vacuum is broken empty blows
Time 17min；
(3) continuous casting working procedure: use large square bland continuous-casting machine, crystallizer section be 280mm*380mm, M-EMS I=
310A,f=2.0Hz；Dynamic soft-reduction uses MC mode, horizontal pulling rate degree 0.60m/min, the casting of low overheat whole process protection, middle packet
Average 15 DEG C of the degree of superheat, middle packet determine hydrogen 2.0ppm；
(4) slow cooling operation: using to enter to cheat slow cooling, enter to cheat 500 DEG C of temperature, slow cooling time 48h, cheats 100 DEG C of temperature out；
(5) rolling process: two igneous materials of rolling；Using universal mill by 280mm*380mm continuous casting square base split rolling method at
150mm*150mm square steel, 500 DEG C of temperature of split rolling method heating furnace preheating section, 1150 DEG C of soaking section temperature, in furnace residual oxygen than 6%,
Dephosphorization hydraulic pressure 23MPa, start rolling temperature are 1050 DEG C；500 DEG C of temperature of rolling bar heating furnace preheating section, soaking section temperature 1070
DEG C, residual oxygen is than 6% in furnace, dephosphorization hydraulic pressure 23MPa, and start rolling temperature is 970 DEG C.
The present embodiment applies 0.5 grade of the effective steel round steel finished product center porosity of small-bore high-pressure boiler at 550 DEG C, and center is inclined
0 grade of analysis, the grading of finished product macrostructure are shown in Table 4；Non-metallic inclusion rank is shown in Table 5, and round steel surface is met the requirements of the standard.
Embodiment 7
It is φ 85mm size round steel, chemical component composition that the present embodiment, which is applied in 550 DEG C of the effective steel of small-bore high-pressure boiler,
And mass percentage is shown in Table 1；As, Sn, Sb, Pb, Bi five-harmful elements content are shown in Table 2；O, N, H gas content are shown in Table 3.
The effective steel production method of the big compression ratio high-pressure boiler of the present embodiment includes smelting, refining, continuous casting, slow cooling and rolling work
Sequence, specific process step are as described below:
(1) oxygen top-blown converter, scrap ratio 8% smelting procedure: are used；Control converter terminal O:500ppm；3min is opened before tapping
Beginning Argon, tapping 1/4 when sequence be added aluminum shot 1.1kg/t steel, synthetic slag 1.2kg/t steel, lime 2.0kg/t steel；Double pushing off the slag behaviour
Make, lower quantity of slag 1.3kg/t steel；
(2) LF refining+RH Fruit storage, LF refining furnace slag charge and fine tuning ingredient one-time-reach-place, process refining procedure: are used
Nitrogen pick-up 6ppm, LF basicity of slag 3.2；RH refines vacuum degree 62Pa, protects vacuum time 12min, and molten steel is quiet after RH vacuum is broken empty blows
Time 18min；
(3) continuous casting working procedure: use large square bland continuous-casting machine, crystallizer section be 280mm*380mm, M-EMS I=
330A,f=3.0Hz；Dynamic soft-reduction uses MC mode, horizontal pulling rate degree 0.63m/min, the casting of low overheat whole process protection, middle packet
Average 20 DEG C of the degree of superheat, middle packet determine hydrogen 1.0ppm；
(4) slow cooling operation: using to enter to cheat slow cooling, enter to cheat 540 DEG C of temperature, slow cooling time 72h, cheats 75 DEG C of temperature out；
(5) rolling process: two igneous materials of rolling；Using universal mill by 280mm*380mm continuous casting square base split rolling method at
150mm*150mm square steel, 800 DEG C of temperature of split rolling method heating furnace preheating section, 1200 DEG C of soaking section temperature, in furnace residual oxygen than 6%,
Dephosphorization hydraulic pressure 22MPa, start rolling temperature are 1070 DEG C；720 DEG C of temperature of rolling bar heating furnace preheating section, soaking section temperature 1120
DEG C, residual oxygen is than 6% in furnace, dephosphorization hydraulic pressure 22MPa, and start rolling temperature is 1020 DEG C.
The present embodiment applies 0.5 grade of the effective steel round steel finished product center porosity of small-bore high-pressure boiler at 550 DEG C, and center is inclined
0 grade of analysis, the grading of finished product macrostructure are shown in Table 4；Non-metallic inclusion rank is shown in Table 5, and round steel surface is met the requirements of the standard.
The effective round steel chemical component composition of 1 Examples 1 to 7 high-pressure boiler of table and weight percentage (%)
Ingredient surplus is Fe and inevitable impurity in table 1.
The effective round steel five-harmful elements mass percent (%) of 2 Examples 1 to 7 high-pressure boiler of table
Effective round steel O, N, H gas content (ppm) of 3 Examples 1 to 7 high-pressure boiler of table
The effective round steel finished product macrostructure grading (unit: grade) of 4 Examples 1 to 7 high-pressure boiler of table
The effective round steel finished product non-metallic inclusion rank of 5 Examples 1 to 7 high-pressure boiler of table (unit: grade)
Find out that round steel macrostructure is fine and close, and internal soundness is good by table 4, the detection of table 5, better than the height of general manufacturing method manufacture
Boiler steel is pressed, requirement of the effective steel of high-pressure boiler to high temperature resistant, high pressure resistant, persistence etc. has been better met.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (10)
1. a kind of effective steel of small-bore high-pressure boiler applied at 550 DEG C, which is characterized in that the effective tempering of high-pressure boiler
At being grouped as and its mass percentage are as follows: C:0.09~0.13%, Si:0.21~0.27%, Mn:0.55~0.60%, P≤
0.020%, S≤0.010%, Cr:0.99~1.08%, Mo:0.29~0.35%, V:0.19~0.24%, Al≤0.020%, surplus
For Fe and inevitable impurity.
2. a kind of effective steel of small-bore high-pressure boiler applied at 550 DEG C according to claim 1, which is characterized in that institute
State the effective steel chemical composition composition of high-pressure boiler and its mass percentage further include: As≤0.010%, Sn≤0.010%, Pb≤
0.010%, Sb≤0.010%, Bi≤0.010%, O≤15ppm, N≤60ppm, H≤2.0ppm, As+Sn+Sb+Pb+Bi≤
0.010%。
3. a kind of effective steel of small-bore high-pressure boiler applied at 550 DEG C according to claim 1 or 2, which is characterized in that
The effective steel specification of high-pressure boiler is 50~90mm of φ.
4. based on a kind of life applied in 550 DEG C of the effective steel of small-bore high-pressure boiler described in claim 1-3 any one
Production method, which is characterized in that the production method includes smelting, refining, continuous casting, slow cooling and rolling process；The refining procedure,
Using LF refining+RH Fruit storage；The rolling process, roll two igneous materials, split rolling method start rolling temperature be 1050~
1100 DEG C, rolling bar start rolling temperature is 970~1020 DEG C.
5. a kind of production method applied in 550 DEG C of the effective steel of small-bore high-pressure boiler according to claim 4, special
Sign is, the refining procedure, using LF refining+RH Fruit storage, LF refining furnace slag charge and fine tuning ingredient one-time-reach-place,
Process nitrogen pick-up≤10ppm, LF basicity of slag 3.0~3.5；RH refines vacuum degree≤67Pa, protects vacuum time >=10min, and RH is true
Molten steel is quiet after the broken sky of sky blows the time >=15min.
6. a kind of production method applied in 550 DEG C of the effective steel of small-bore high-pressure boiler according to claim 4, special
Sign is that the rolling process rolls two igneous materials, i.e. 280mm*380mm continuous casting square base split rolling method is at the side 150mm*150mm
Steel, is then rolled into bar for 150mm*150mm square steel, sufficiently makes up component segregation caused by high alloy；Cogging uses omnipotent
By 280mm*380mm continuous casting square base split rolling method at 150mm*150mm square steel, split rolling method heating furnace preheating section temperature is milling train
500~800 DEG C, soaking section temperature is 1150~1200 DEG C, and start rolling temperature is 1050~1100 DEG C.
7. a kind of life applied in 550 DEG C of the effective steel of small-bore high-pressure boiler according to claim 4-6 any one
Production method, which is characterized in that the rolling process, rolling bar, heating furnace preheating section temperature are 500~720 DEG C, soaking zone temperature
Degree is 1070~1120 DEG C, and start rolling temperature is 970~1020 DEG C.
8. a kind of life applied in 550 DEG C of the effective steel of small-bore high-pressure boiler according to claim 4-6 any one
Production method, which is characterized in that the rolling process, two igneous materials heat the residual oxygen of furnace atmosphere than control 3~6%, dephosphorization water
Press >=22MPa.
9. a kind of life applied in 550 DEG C of the effective steel of small-bore high-pressure boiler according to claim 4-6 any one
Production method, which is characterized in that the continuous casting working procedure, using large square bland continuous-casting machine, crystallizer section is 280mm*380mm, crystallization
Device electromagnetic agitation I:310~330 A, f:2.0~3.0 Hz；Dynamic soft-reduction uses MC mode, and the pulling rate degree 0.60 that weighs~
0.65m/min, low overheat whole process protection are poured, and at 15~35 DEG C, middle packet determines hydrogen, hydrogen content for average degree of superheat control in middle packet
≤2.0ppm。
10. a kind of life applied in 550 DEG C of the effective steel of small-bore high-pressure boiler according to claim 4-6 any one
Production method, which is characterized in that the slow cooling operation enters and cheats temperature >=500 DEG C using entering to cheat slow cooling, slow cooling time >=48h, out
Cheat temperature≤100 DEG C.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114164376A (en) * | 2021-10-26 | 2022-03-11 | 南京钢铁股份有限公司 | Low-carbon peritectic steel continuous casting round billet for high-pressure boiler and manufacturing method thereof |
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| CN107460403A (en) * | 2017-07-13 | 2017-12-12 | 山东钢铁股份有限公司 | A kind of effective steel round blank of high-pressure boiler, the effective steel of high-pressure boiler and preparation method thereof |
| CN107686940A (en) * | 2017-08-07 | 2018-02-13 | 河钢股份有限公司邯郸分公司 | A kind of effective steel of big compression ratio high-pressure boiler and its production method |
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| CN107686940A (en) * | 2017-08-07 | 2018-02-13 | 河钢股份有限公司邯郸分公司 | A kind of effective steel of big compression ratio high-pressure boiler and its production method |
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| CN114164376A (en) * | 2021-10-26 | 2022-03-11 | 南京钢铁股份有限公司 | Low-carbon peritectic steel continuous casting round billet for high-pressure boiler and manufacturing method thereof |
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