CN104593697A - Method for manufacturing high-strength heat-resistant steel sheet for power station - Google Patents
Method for manufacturing high-strength heat-resistant steel sheet for power station Download PDFInfo
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- CN104593697A CN104593697A CN201510027659.0A CN201510027659A CN104593697A CN 104593697 A CN104593697 A CN 104593697A CN 201510027659 A CN201510027659 A CN 201510027659A CN 104593697 A CN104593697 A CN 104593697A
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Abstract
The invention relates to a method for manufacturing a high-strength heat-resistant steel sheet for a power station. According to the method, the prepared continuous casting billet comprises the following components in percentage by weight: 0.07-0.13% of C, 0.15-0.50% of Si, 0.35-0.55% of Mn, less than or equal to 0.02% of P, less than or equal to 0.01% of S, 8.50-9.50% of Cr, 0.30-0.6% of Mo, 0.15-0.25% of V, 1.50-2.00% of W, 0.04-0.07% of Nb, 0.035-0.065% of N, 0.002-0.005% of B, 0.10-0.30% of Ni and greater than 0 and less than or equal to 0.015% of Al; the annealing temperature is 740 +/-10 DEG C; defects are ground by virtue of hot grinding; the heating temperature of a steel billet is 1220 +/-10 DEG C; during rolling, the rolling-starting temperature is 1170-1200 DEG C, the pass reduction in roughing is 25-30%, the pass reduction in finishing is 30-35% and the final rolling temperature is 860-880 DEG C; the slow cooling pit temperature is not less than 200 DEG C and the steel sheet putting time is 120-180 minutes; the heat straightening is performed and the tempering temperature is 790 +/-10 DEG C. The method for manufacturing high-strength heat-resistant steel sheet for the power station is short in flow, high in efficiency and low in cost.
Description
Technical field
The present invention relates to the manufacture method of a kind of power station high-strength temperature-resistant steel plate.
Background technology
Power station high temperature steel is owing to having excellent high-strength temperature-resistant performance, and the structure that (intensive parameter reaches more than 600Mpa, and heat resisting temperature reaches 600 DEG C) can be used as Power Station Boiler Heating Surface structural part and four large pipeline suspension and supports manufactures.
In order to prepare the power station high-strength temperature-resistant steel plate meeting performance requriements, this steel plate need after normalizing+tempering heat treatment yield strength R
p0.2≤ 440Mpa, tensile strength Rm≤620Mpa, unit elongation A≤20%, normal temperature ballistic work A
kV2≤ 90 J.In actual production trial-manufacturing process, steel plate, after rolling, needs off-line to carry out normalizing and tempering heat treatment, causes that technical process is long, efficiency is low, cost is high.
Summary of the invention
In order to solve existing power station high-strength temperature-resistant steel plate manufacturing processed in there is thermal treatment process long flow path, efficiency is low and cost is high deficiency, the invention provides the manufacture method of the power station steel plate that a kind of flow process is short, efficiency is high, cost is low, performance is excellent.
Mechanism of the present invention is by adopting controlled rolling+tempering process to realize to power station high-strength heat-resistant steel, shortening technical process, improve production efficiency, reduces manufacturing cost, and manufacture ejecting plate shape is good, the power station high-strength temperature-resistant steel plate of excellent performance.
The technical process of the manufacture method of this power station high-strength heat-resistant steel is: Slug preparing → annealing → hot repair mill → heating steel billet → rolling → slow cooling → hot straightening → tempering heat treatment → inspection.
The percent mass proportioning of this power station high-strength temperature-resistant composition of steel is:
C 0.07～0.13， Si 0.15～0.50， Mn 0.35～0.55， P ≤0.02， S≤0.01， Cr 8.50～9.50， Mo 0.30～0.6， V 0.15～0.25， W 1.50～2.00，
Nb 0.04 ~ 0.07, N 0.035 ~ 0.065, B 0.002 ~ 0.005, Ni 0.10 ~ 0.30,0 < Al≤0.015, all the other are Fe and inevitable impurity;
The present invention is directed to the Slug preparing in the operation of rolling, annealing, hot repair mill, heating steel billet, rolling, slow cooling, hot straightening, tempering etc. to be described.
The preparation method of this power station high-strength heat-resistant steel comprises following step successively:
I Slug preparing
Through hot metal pretreatment, converter top and bottom complex blowing, AOD and LF refining, the mass percent of molten steel composition reaches following requirement tapping:
C 0.07～0.13， Si 0.15～0.50， Mn 0.35～0.55， P ≤0.02， S≤0.01， Cr 8.50～9.50， Mo 0.30～0.6， V 0.15～0.25， W 1.50～2.00，
Nb 0.04 ~ 0.07, N 0.035 ~ 0.065, B 0.002 ~ 0.005, Ni 0.10 ~ 0.30,0 < Al≤0.015, all the other are Fe and inevitable impurity;
The continuously cast bloom that continuous casting becomes 200 ~ 220mm thick;
iIannealing
The red annealing furnace that send of strand is annealed, annealing temperature 740 scholar 10 DEG C, and soaking time 3 ~ 4 hours, directly comes out of the stove, and redly send hot repair grinder sequence;
iIIhot repair is ground
Reconditioning is carried out in the red annealing continuously cast bloom upper and lower plates face sent, grinds clean defect; (the defect such as continuously cast bloom crizzle, subsurface porosity.Peeling amount is 1-2%, and one side grinding thichness is 1-2.2mm) become steel billet;
iVheating steel billet
Heated in process furnace by steel billet after reconditioning, Heating temperature is 1220 scholar 10 DEG C, and soaking time is 3 ~ 4 hours, guarantees that steel billet burning is even, grills thoroughly;
vrolling
Through high-pressure water descaling, by the rolling on roughing mill of the steel billet after high-pressure water descaling, start rolling temperature 1170 ~ 1200 DEG C, roughing reduction in pass is 25 ~ 30%, is rolled into intermediate blank, and workpiece thickness controls at 60 ~ 80mm, intermediate blank is rolling on finishing mill, last pass draught is 30 ~ 35%, and finishing temperature control is at 860 ~ 880 DEG C, and finish rolling becomes steel plate;
vIslow cooling
Before steel plate enters hole, in burial pit, temperature must reach more than 200 DEG C, after steel plate rolling completes, and directly put into burial pit and carry out cooling in heap, the time of putting into is 120 ~ 180min.
VII hot straightening
In order to ensure template, steel plate is carried out hot straightening; Straightening temperature is 500-600 DEG C, and aligning passage is 1-2 road, ensures steel plate width direction roughness≤5mm/m.
vIIItempering
Red for steel plate delivering in heat treatment furnace is carried out temper, and tempering temperature is 790 scholar 10 DEG C, and soaking time is 60 ~ 120min, and steel plate is come out of the stove air cooling.
For ensuring the quality of products, this power station manufacture method of high-strength temperature-resistant steel plate exists
vIIItempering light plate is come out of the stove after air cooling, also carries out steel plate
Ⅸinspection, i.e. flaw detection, mechanical property and the inspection of plate shape; Ultrasonic inspection, rank≤II level; Mechanical properties test, yield strength R
p0.2be 480 ~ 530MPa, tensile strength R
mbe 665 ~ 694MPa, unit elongation A is 24 ~ 29%, normal temperature ballistic work A
kV2be 165 ~ 210J; Plate shape is checked, and steel plate width direction roughness is not more than 5mm/m.
Advantage of the present invention
Power station high-strength temperature-resistant steel adopts controlled rolling+tempering heat treatment process method, and the complete rear burial pit of directly putting into of rolling carries out cooling in heap, concrete case study on implementation eliminate reheat, normalizing process, production cost reduces by 500 yuan/ton.Shorten technical process, improve production efficiency, by mating rational rolling technological parameter, ensure that the structure property of steel plate, rolling unrelieved stress is eliminated by rolling rear slow cooling, rectify technique Strip Shape Control for steel plate hot and provide guarantee, the power station of preparation is good with high-strength temperature-resistant steel plate plate shape, and mechanical property all reaches ASTM A1017/ A1017M standard-required.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but specific embodiment of the invention is not limited to following embodiment.
embodiment 1
Power station heat-resisting steel sheet and plate dimensions is thickness 25mm, width 2000mm, and the mass percent of its chemical composition is: C 0.088%, Si 0.224%, Mn 0.43%, P 0.012 %, S 0.002%, Cr 8.86%, Mo 0.41%, V 0.21%, W 1.61%, Nb 0.059%, N 0.057%, B 0.0022%, Ni 0.21%, Al 0.003%, all the other are Fe and inevitable impurity.
Ultrasonic inspection: rank≤II level;
Mechanical property requirements: yield strength R
p0.2>=440MPa, tensile strength R
m>=620MPa, unit elongation A>=20%, normal temperature ballistic work A
kV2>=90J;
Template requires: steel plate width direction roughness≤5mm/m.
The present embodiment comprises following step successively:
I Slug preparing
Through hot metal pretreatment, converter top and bottom complex blowing, AOD and LF refining, the composition of molten steel reaches following requirement tapping:
C 0.088%， Si 0.224%， Mn 0.43%， P 0.012 %， S 0.002%，
Cr 8.86%, Mo 0.41%, V 0.21%, W 1.61%, Nb 0.059%, N 0.057%, B 0.0022%, Ni 0.21%, Al 0.003%, all the other are Fe and inevitable impurity.
The continuously cast bloom that continuous casting becomes 220mm thick;
II annealing
The red annealing furnace that send of strand is annealed, annealing temperature 740 DEG C, and soaking time 4 hours, directly comes out of the stove, and redly send hot repair grinder sequence;
III hot repair mill
Reconditioning is carried out in the red annealing continuously cast bloom upper and lower plates face sent, and grind clean defect, peeling amount is 1.4%, and one side grinding thichness is 1.54mm, becomes steel billet.
IV heating steel billet
Heated in process furnace by steel billet after reconditioning, Heating temperature is 1230 DEG C, and soaking time is 4 hours, guarantees that steel billet burning is even, grills thoroughly;
V rolling
Through high-pressure water descaling, by the rolling on roughing mill of the steel billet after high-pressure water descaling, start rolling temperature 1180 DEG C, roughing reduction in pass is 27%, and be rolled into middle part base, workpiece thickness controls at 65mm, roll into the rolling on finishing mill of middle steel plate intermediate blank, last pass draught is 31%, and finishing temperature control is at 870 DEG C, and finish rolling becomes steel plate;
VI slow cooling
Before steel plate enters hole, in burial pit, temperature must reach more than 200 DEG C, after steel plate rolling completes, and directly put into burial pit and carry out cooling in heap, the time of putting into is 150min.
VII hot straightening
In order to ensure template, steel plate is carried out hot straightening; Straightening temperature is 530 DEG C, and aligning passage is 1 road, ensures steel plate width direction roughness≤5mm/m.
VIII tempering
Red for steel plate delivering in heat treatment furnace is carried out temper, and tempering temperature is 790 DEG C, and soaking time is 70min, and steel plate is come out of the stove air cooling;
Ⅸ inspection
Finished steel plate is detected a flaw, mechanical property and plate shape inspection.Ultrasonic inspection rank is I level, carries out mechanical properties test, yield strength R to finished steel plate
p0.2for 490MPa, tensile strength R
mfor 675MPa, unit elongation A is 25.5%, normal temperature ballistic work A
kV2for 170J, meet mechanical property requirements, steel plate width direction roughness is 4mm/m.
embodiment 2
Power station heat-resisting steel sheet and plate dimensions is thickness 36mm, width 2000mm, and the mass percent of its chemical composition is:
C 0.087%, Si 0.23%, Mn 0.44%, P 0.013 %, S 0.001%, Cr 8.91%, Mo 0.43%, V 0.23%, W 1.63%, Nb 0.061%, N 0.059%, B 0.0021%, Ni 0.22%, Al 0.004%, all the other are Fe and inevitable impurity.
Ultrasonic inspection: rank≤II level;
Mechanical property requirements: yield strength R
p0.2>=440MPa, tensile strength R
m>=620MPa, unit elongation A>=20%, normal temperature ballistic work A
kV2>=90J;
Template requires: steel plate width direction roughness≤5mm/m.
The present embodiment comprises following step successively:
I Slug preparing
Through hot metal pretreatment, converter top and bottom complex blowing, AOD and LF refining, the composition of molten steel reaches following requirement tapping:
C 0.087%， Si 0.23%，Mn 0.44%， P 0.013 %， S 0.001%，
Cr 8.91%, Mo 0.43%, V 0.23%, W 1.63%, Nb 0.061%, N 0.059%, B 0.0021%, Ni 0.22%, Al 0.004%, all the other are Fe and inevitable impurity.
The continuously cast bloom that continuous casting becomes 220mm thick;
II annealing
The red annealing furnace that send of strand is annealed, annealing temperature 740 DEG C, and soaking time 4 hours, directly comes out of the stove, and redly send hot repair grinder sequence;
III hot repair mill
Reconditioning is carried out in the red annealing continuously cast bloom upper and lower plates face sent, and grind clean defect, peeling amount is 1.6%, and one side grinding thichness is 1.76mm, becomes steel billet.
IV heating steel billet
Heated in process furnace by steel billet after reconditioning, Heating temperature is 1210 DEG C, and soaking time is 4 hours, guarantees that steel billet burning is even, grills thoroughly;
V rolling
Through high-pressure water descaling, by the rolling on roughing mill of the steel billet after high-pressure water descaling, start rolling temperature 1170 DEG C, roughing reduction in pass is 29%, and workpiece thickness controls, at 75mm, to roll into intermediate blank, intermediate blank is rolling on finishing mill, last pass draught is 32%, and finishing temperature control is at 875 DEG C, and finish rolling becomes steel plate;
VI slow cooling
Before steel plate enters hole, in burial pit, temperature must reach more than 200 DEG C, after steel plate rolling completes, and directly put into burial pit and carry out cooling in heap, the time of putting into is 170min.
VII hot straightening
In order to ensure template, steel plate is carried out hot straightening; Straightening temperature is 580 DEG C, and aligning passage is 2 roads, ensures steel plate width direction roughness≤5mm/m.
VIII tempering
Red for steel plate delivering in heat treatment furnace is carried out temper, and tempering temperature is 790 DEG C, and soaking time is 110min, and steel plate is come out of the stove air cooling;
Ⅸ inspection
Finished steel plate is detected a flaw, mechanical property and plate shape inspection.UT (Ultrasonic Testing) rank is I level, carries out mechanical properties test, yield strength R to finished steel plate
p0.2for 495MPa, tensile strength R
mfor 680MPa, unit elongation A is 25%, normal temperature ballistic work A
kV2for 192J, meet mechanical property requirements, steel plate width direction roughness is 4mm/m.
Claims (2)
1. a power station manufacture method for high-strength temperature-resistant steel plate, it comprises following step successively:
islug preparing
Through hot metal pretreatment, converter top and bottom complex blowing, AOD and LF refining, the mass percent of molten steel composition reaches following requirement tapping:
C 0.07 ~ 0.13, Si 0.15 ~ 0.50, Mn 0.35 ~ 0.55, P≤0.02, S≤0.01, Cr 8.50 ~ 9.50, Mo 0.30 ~ 0.6, V 0.15 ~ 0.25, W 1.50 ~ 2.00, Nb 0.04 ~ 0.07, N 0.035 ~ 0.065, B 0.002 ~ 0.005%, Ni 0.10 ~ 0.30,0 < Al≤0.015, all the other are Fe and inevitable impurity;
The continuously cast bloom that continuous casting becomes 200 ~ 220mm thick;
iIannealing
The red annealing furnace that send of strand is annealed, annealing temperature 740 scholar 10 DEG C, and soaking time 3 ~ 4 hours, directly comes out of the stove, and redly send hot repair grinder sequence;
iIIhot repair is ground
Reconditioning is carried out in the red annealing continuously cast bloom upper and lower plates face sent, grinds clean defect; Peeling amount is 1-2%, and one side grinding thichness is 1-2.2mm, becomes steel billet;
iVheating steel billet
Heated in process furnace by steel billet after reconditioning, Heating temperature is 1220 scholar 10 DEG C, and soaking time is 3 ~ 4 hours, guarantees that steel billet burning is even, grills thoroughly;
vrolling
Through high-pressure water descaling, by the rolling on roughing mill of the steel billet after high-pressure water descaling, start rolling temperature 1170 ~ 1200 DEG C, roughing reduction in pass is 25 ~ 30%, is rolled into intermediate blank, and workpiece thickness controls at 60 ~ 80mm, intermediate blank is rolling on finishing mill, last pass draught is 30 ~ 35%, and finishing temperature control is at 860 ~ 880 DEG C, and finish rolling becomes steel plate;
vIslow cooling
Before steel plate enters hole, in burial pit, temperature reaches more than 200 DEG C, after steel plate rolling completes, and directly put into burial pit and carry out cooling in heap, the time of putting into is 120 ~ 180min;
vIIhot straightening
Steel plate is carried out hot straightening; Steel plate width direction roughness≤5mm/m;
vIIItempering
Red for steel plate delivering in heat treatment furnace is carried out temper, and tempering temperature is 790 scholar 10 DEG C, and soaking time is 60 ~ 120min, and steel plate is come out of the stove air cooling.
2. the manufacture method of power station according to claim 1 high-strength temperature-resistant steel plate, is characterized in that:
vIIItempering light plate is come out of the stove after air cooling, also steel plate is detected a flaw, mechanical property and plate shape inspection; Ultrasonic inspection, rank≤II level; Mechanical properties test, yield strength R
p0.2be 480 ~ 530MPa, tensile strength R
mbe 665 ~ 694MPa, unit elongation A is 24 ~ 29%, normal temperature ballistic work A
kV2be 165 ~ 210J; Plate shape is checked, and steel plate width direction roughness is not more than 5mm/m.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207845A (en) * | 2017-06-30 | 2019-01-15 | 宝钢特钢有限公司 | A kind of ultra supercritical heat-resisting steel sheet and plate and its manufacturing method |
| CN113699337A (en) * | 2021-08-06 | 2021-11-26 | 山西太钢不锈钢股份有限公司 | Heat treatment process for continuous casting large round billet of 9Cr heat-resistant steel |
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| JP2001262286A (en) * | 2000-03-22 | 2001-09-26 | Japan Steel Works Ltd:The | HIGH-PURITY HIGH-Cr FERRITIC HEAT RESISTING STEEL AND ITS MANUFACTURING METHOD |
| CN1807955A (en) * | 2006-01-20 | 2006-07-26 | 天津商学院 | High alloy steel seamless steel pipe and production method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207845A (en) * | 2017-06-30 | 2019-01-15 | 宝钢特钢有限公司 | A kind of ultra supercritical heat-resisting steel sheet and plate and its manufacturing method |
| CN113699337A (en) * | 2021-08-06 | 2021-11-26 | 山西太钢不锈钢股份有限公司 | Heat treatment process for continuous casting large round billet of 9Cr heat-resistant steel |
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