CN106834925A - A kind of 780MPa grades of quenching and tempering type water-power steel plate and production method - Google Patents
A kind of 780MPa grades of quenching and tempering type water-power steel plate and production method Download PDFInfo
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- CN106834925A CN106834925A CN201710021397.6A CN201710021397A CN106834925A CN 106834925 A CN106834925 A CN 106834925A CN 201710021397 A CN201710021397 A CN 201710021397A CN 106834925 A CN106834925 A CN 106834925A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
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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
Abstract
The invention discloses a kind of 780MPa grades of quenching and tempering type water-power steel plate and production method, the steel plate chemical composition and its weight/mass percentage composition are as follows：C：0.07~0.09%, Si：0.12~0.22%, Mn：1.2~1.4%, P≤0.010%, S≤0.005%, Ni：0.45~0.6%, Cr：0.4~0.5%, Nb：0.01~0.03%, Al：0.05~0.07%, Mo：0.30~0.40%, V：0.03~0.04%, B：0.0010~0.0020%, balance of Fe and inevitable impurity.Production method includes smelting continuous casting working procedure, heating process, rolling process, stacking slow cooling operation, Tempering and Quenching operation.Up to 60mm, yield strength >=690MPa, tensile strength is 770~930MPa to the steel plate thickness of present invention production, and elongation after fracture >=17%, 40 DEG C of ballistic work >=100J, comprehensive mechanical property is excellent, with low cost.
Description
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of 780MPa grades of quenching and tempering type water-power steel plate and producer
Method.
Background technology
Water-power steel generally, refers in particular to pressure pipeline steel, belongs to mesolow, middle low-temperature pressure container category, such
Diversion penstock manufacture and the auxiliary equipment such as floor, bifurcated pipe, spiral case that product is used in factory dam, hydropower station pressure water pipe is
Generating water is introduced directly into the hydraulic turbine from reservoir, forebay or surge-chamber, or is hoisted by water pump in hydroenergy storage station defeated
Water, bears the pipeline of internal water pressure higher, its feature：The gradient is steep, internal water pressure is big, bears flowing pressure, and near factory building, loses
Fruit is serious afterwards, so must be safe and reliable.Penstocks must endure as the impact of huge hydraulic pressure and current, to steel plate
Chemical composition, tensile strength（Low temperature）The performances such as ballistic work have and compare strict requirements.
Low-welding crack-sensitive high-strength steel, it is the low-alloy high-strength that a class has superior weldability energy and low-temperature flexibility
Degree steel, the advantage is that and do not preheat or slightly preheat without cracking before welding, and mainly solve the weldering of large-scale steel structure members
Connect construction problem.The design principle of low welding crack sensitivity steel is exactly to reduce carbon and more trace elements alloying, but in steel
The reduction of alloying element directly affects the quenching degree of steel, so this rank quenching and tempering type low-welding crack-sensitive water-power steel plate is past
Toward adding boron element, and Ti elements are often added in such steel to generate TiN, so as to reduce the generation of BN in steel with increasing steel
The content of solid solution boron, but TiN field trashes in steel also result in the decline of steel plate impact flexibility.
Discovery is analyzed to published patent, in Chinese patent CN104532148A, a kind of 800MPa is disclosed
Level low-welding crack-sensitive quenching and tempering type water-power steel plate, in the composition design of steel add Ti and Cu elements, cause alloy into
This is higher, and, Cu elements are added in steel, strand and surface of steel plate is produced star-like crack, plate surface quality control
In the presence of certain difficulty, and the addition of Ti elements causes to form TiN field trashes in steel, because the Precipitation Temperature of TiN in steel is up to
1440 DEG C, easy agglomeration, bulk TiN particles are basically unchanged shape and fragmentation, thick TiN particles under impact loading
As the key factor for reducing steel low-temperature flexibility, mechanical property of steel plate uniformity and stability problem are difficult to control to.
The content of the invention
It is an object of the invention to provide a kind of 780MPa grades of quenching and tempering type water-power steel plate and production method, by appropriate
Alloying element is designed and hot rolling and heat treatment method, cancels the addition of Ti, Cu alloying element in steel, eliminates Cu, Ti alloying element
To the adverse effect of steel, using the composition design of low C Al high, the 780MPa for being produced grades of quenching and tempering type low-welding crack-sensitive water
Electricity steel, excellent in mechanical performance, the impact flexibility of steel is improved significantly, and with good low-welding crack-sensitive,
Meet mechanical property and the processing performance requirement of this kind of steel, plate surface quality is good, realizes that alloy minimizing is produced, and reduces life
Produce cost.
In order to solve the above technical problems, the present invention is adopted the following technical scheme that：A kind of 780MPa grades of quenching and tempering type water-power steel
Plate, the steel plate chemical composition and its weight/mass percentage composition are as follows：C：0.07~0.09%, Si：0.12~0.22%, Mn：1.2~
1.4%, P≤0.010%, S≤0.005%, Ni：0.45~0.6%, Cr：0.4~0.5%, Nb：0.01~0.03%, Al：0.05~
0.07%, Mo：0.30~0.40%, V：0.03~0.04%, B：0.0010~0.0020%, balance of Fe are miscellaneous with inevitable
Matter.
The metallographic structure of steel plate quenching state of the present invention is ferrite bainite, and be finally tempered state is organized as tempering Soxhlet
Body.
Steel plate room-temperature yield strength >=690MPa of the present invention, tensile strength be 770~930MPa, elongation after fracture >=
17%, -40 DEG C of ballistic work >=100J.
Steel plate of the present invention impacts specimen size for 10 × 10 × 55mm, welding cold cracking Sensitivity Index Pcm≤0.23,
Plate quality is good.
The present invention also provides a kind of production method of above-mentioned 780MPa grades of quenching and tempering type water-power steel plate, the production method
Including smelting continuous casting working procedure, heating process, rolling process, stacking slow cooling operation, Tempering and Quenching operation；The smelting continuous casting work
Sequence is by the chemical composition smelting molten steel for designing and casts the strand that thickness is 300mm, and Chemical Composition in Cast Billet and its quality percentage contain
Amount is as follows：C：0.07~0.09%, Si：0.12~0.22%, Mn：1.2~1.4%, P≤0.010%, S≤0.005%, Ni：0.45
~0.6%, Cr：0.4~0.5%, Nb：0.01~0.03%, Al：0.05~0.07%, Mo：0.30~0.40%, V：0.03~
0.04%, B：0.0010~0.0020%, balance of Fe and inevitable impurity.
Heating process of the present invention, strand is heated according to the areas of Lu Nei tetra-, and Ith area of heating is heated to 780 ± 10 DEG C, total to add
The hot time is 1h ± 20min, and IIth area of heating is heated to 1100 DEG C, and total heat time is 2h ± 20min, and IIIth area of heating is heated to
1200 ± 10 DEG C, total heat time is 2h ± 20min, and soaking zone temperature is 1200 ± 10 DEG C, and soaking time is 1h ± 10min.
Rolling process of the present invention, road is rolled by strand according to roughing, roughing is carried out after the area's homogeneous heatings of Lu Nei tetra-
Secondary is 8 passages, and roughing start rolling temperature is 1150 ± 30 DEG C, and finishing temperature is 1050 ± 20 DEG C, and total reduction is 53%；By centre
The passage of base finish rolling 9, total reduction is 57%, and finish rolling start rolling temperature is 840 ± 20 DEG C, and finishing temperature is 800 ± 20 DEG C.
Stacking slow cooling operation of the present invention, 680 ± 20 DEG C are cooled to using rear fast cooling device is rolled by the steel plate after finish rolling,
Steel plate is carried out into stacking treatment afterwards, the stacking time is 24 ± 2h.
Tempering and Quenching operation of the present invention, carries out the offline Tempering and Quenching of steel plate after rolling：Steel plate is added again
Heat quenches to 930 DEG C after insulation 40min, is then tempered, 600~640 DEG C of temperature, and tempering heat insulating coefficient is 1min/
Mm, tempering time starts to calculate to reach actual temperature, obtains 780MPa grades of quenching and tempering type water-power steel plate.
Steel plate maximum gauge 60mm of the present invention.
What the present invention was obtained is a kind of 780MPa grades of quenching and tempering type low-welding crack-sensitive water-power steel plate, it is of the invention into
Set up separately meter be based on it is following some：
C：Effect in steel is solution strengthening, but unfavorable to welding performance.Content is higher, and welding performance is poorer, in low weldering
In connecing the composition design of crack sensitivity water-power steel plate, in order that steel plate has good welding performance, the carbon content in steel
Control is between 0.07~0.09%.
Si：Effect in steel is solution strengthening, can also improve the quenching degree of steel, Si contents Gao Shihui make the plasticity of steel and
Welding performance reduction, therefore, the content of Si is controlled in 0.12~0.0.22% or so.
Mn：Effect in steel is solution strengthening and improves quenching degree, but too high levels will make steel cause crystalline substance at high temperature
Grain roughening, and Mn is too high improves carbon equivalent, it is also unfavorable to weldability.Mn too high levels in steel, also can be to smelting and rolled bands
Come difficult, the toughness to steel is also unfavorable.Therefore, the control of Mn contents is in the range of 1.2~1.4%.
Ni：Belong to the element of whole solid solutions in steel, with the effect for substantially reducing Cold Brittleness Transition Temperature, to improving steel
Low-temperature impact toughness plays an important role, but Ni is noble metal, answers suitable control its content, therefore, the control of Ni amounts 0.45~
In the range of 0.6%.
Cr：Cr elements and Fe elements form continuous solid solution, and form various carbide with C element.It is solid-solubilized in steel
The carbide of Cr elements and Cr can improve the intensity of steel plate.Cr contents increase, and thicker carbide can be formed, so as to deteriorate steel
The impact property of plate.Therefore, the control of Cr contents is in the range of 0.4~0.5%.
Mo：During Mo elements are solid-solubilized in steel in austenitizing, realized carefully by suppressing diffusion Interface Motion in cooling procedure
Change final tissue.Mo elements are expensive alloying elements simultaneously, are to ensure plate property and cost, the control of Mo contents 0.3~
In the range of 0.4%.
Nb：Effects of the Nb in steel, on the one hand to reach the purpose of crystal grain thinning and increase steel plate thickness, be on the other hand
Two-phase control rolling is realized, i.e., non-recrystallization zone lower temperature is rolled to improve austenite inside dislocation density, in subsequent cooling
During form the tissue of refinement.Nb contents are higher to form thicker NbC precipitations in drawing process, so as to reduce steel plate
Low-temperature impact work, therefore, Nb contents control in the range of 0.01~0.03%.
V：V is combined in steel with N and C, forms fine precipitation particles, plays precipitation enhancement.V and Cu in steel all
It has been precipitation enhancement, but for relative Cu, V need to only add minimal amount of, you can reach equal precipitation strength effect.
Therefore, V content control is in the range of 0.03~0.04%.
B：B element addition can improve the quenching degree of steel plate in steel, form bainite or martensitic structure.B content is higher
When, B atoms can be enriched with crystal boundary, reduce crystal boundary and combine energy, so as to occur to be broken when by percussion along crystalline substance dissociation.Cause
This, B content is controlled in the range of 0.001~0.002%.
Al：Al elements form the precipitation of tiny AlN in high temperature, and austenite crystal is suppressed in heating of plate blank austenitizing
Grow up, reach fining austenite grains, improve the purpose of steel toughness at low temperature.Additionally, properly increasing the content of Al, may be used also
The generation of BN in steel is further reduced, increases the content of solid solution boron in steel, Al is too high to cause larger Al oxides to be formed, drop
The low temperature impact properties and detection capability of low steel plate.Therefore, Al content control is in the range of 0.05~0.07%.
It is using the beneficial effect produced by above-mentioned technical proposal：1st, the steel plate low-temperature impact toughness that the present invention is obtained is excellent
Good, steel plate room-temperature yield strength >=690MPa, tensile strength is 770~930MPa, elongation after fracture >=17%, -40 DEG C of ballistic works
>=100J, far beyond index specified in engineer applied.Steel plate impact specimen size is 10 × 10 × 55mm, and welding cold cracking is quick
Sense indices P cm≤0.23.2nd, the present invention starts with from the composition design of steel grade, develops a kind of 780MPa grades of quenching and tempering type water-power steel
The production technology of plate, the characteristics of the steel plate has low-welding crack-sensitive, this method considers the intensity of water-power steel plate, modeling
Property, the requirement of toughness and welding performance, the optimization design chemical composition of steel cancels the addition of Ti, Cu alloying element in steel,
Adverse effect of Cu, Ti alloying element to steel is eliminated, using rational cooling controlling and rolling controlling process and Technology for Heating Processing, obtains preferable
Microstructure, it is ensured that its performance requirement, the impact flexibility of steel is improved significantly, plate surface quality is good, realizes alloy
Minimizing is produced, and reduces production cost.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of the embodiment of the present invention 1；
Fig. 2 is the metallographic structure figure of the embodiment of the present invention 2；
Fig. 3 is the metallographic structure figure of the embodiment of the present invention 3；
Fig. 4 is the metallographic structure figure of the embodiment of the present invention 4；
Fig. 5 is the metallographic structure figure of the embodiment of the present invention 5.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention will be described in detail.
Embodiment 1
A kind of 780MPa grades of quenching and tempering type water-power steel plate, the weight/mass percentage composition of its chemical composition is：C：0.08%, Si：0.20%,
Mn：1.4%, P：0.009%, S：0.003%, Ni：0.47%, Cr：0.48%, Nb：0.02%, Al：0.06%, Mo：0.30%, V：
0.03, B：0.0010%, balance of Fe and inevitable impurity.
The production method concrete technology of 780MPa grades of quenching and tempering type water-power steel plate is as follows：
Continuous casting working procedure is smelted by the chemical composition smelting molten steel of design and the strand that thickness is 300mm is cast, and it is cast into specification
It is the continuous casting billet of 300*2400*2800mm, stacks of blanks cooling 48h, blank surface checks fed to boiler through scafing.
Strand is heated according to the areas of Lu Nei tetra-, Ith area of heating is heated to 780 DEG C, and total heat time is 1h, the heating of IIth area of heating
To 1100 DEG C, total heat time is 2h, and IIIth area of heating is heated to 1200 DEG C, and total heat time is 2h, and soaking zone temperature is 1200
DEG C, soaking time is 1h.
By strand according to roughing is carried out after the area's homogeneous heatings of Lu Nei tetra-, roughing rolling pass is 8 passages, roughing open rolling temperature
It is 1150 DEG C to spend, and finishing temperature is 1050 DEG C, and total reduction is 53%；By the middle passage of base finish rolling 9, total reduction is 57%, essence
It is 840 DEG C to roll start rolling temperature, and finishing temperature is 800 DEG C, and the thickness of steel plate is 60mm after finish rolling.
Stacking slow cooling operation, 680 DEG C are cooled to using rear fast cooling device is rolled by the steel plate after finish rolling, afterwards carry out steel plate
Stacking treatment, the stacking time is 24h.
Tempering and Quenching operation, carries out the offline Tempering and Quenching of steel plate after rolling：Steel plate is reheated to 930 DEG C,
Quenched after insulation 40min, be then tempered, 600 DEG C of temperature, tempering heat insulating coefficient is 1min/mm, and tempering time is reaching
Start to calculate to actual temperature, obtain 780MPa grades of quenching and tempering type water-power steel plate.
Its metallographic structure is tempered sorbite as shown in Figure 1.
Embodiment 2
A kind of 780MPa grades of quenching and tempering type water-power steel plate, the weight/mass percentage composition of its chemical composition is：C：0.08%, Si：0.20%,
Mn：1.4%, P：0.009%, S：0.003%, Ni：0.47%, Cr：0.48%, Nb：0.02%, Al：0.06%, Mo：0.30%, V：
0.03, B：0.0010%, balance of Fe and inevitable impurity.
The production method concrete technology of 780MPa grades of quenching and tempering type water-power steel plate is as follows：
Continuous casting working procedure is smelted by the chemical composition smelting molten steel of design and the strand that thickness is 300mm is cast, and it is cast into specification
It is the continuous casting billet of 300*2400*2800mm, stacks of blanks cooling 48h, blank surface checks fed to boiler through scafing.
Strand is heated according to the areas of Lu Nei tetra-, Ith area of heating is heated to 780 DEG C, and total heat time is 1h, the heating of IIth area of heating
To 1100 DEG C, total heat time is 2h, and IIIth area of heating is heated to 1200 DEG C, and total heat time is 2h, and soaking zone temperature is 1200
DEG C, soaking time is 1h.
By strand according to roughing is carried out after the area's homogeneous heatings of Lu Nei tetra-, roughing rolling pass is 8 passages, roughing open rolling temperature
It is 1150 DEG C to spend, and finishing temperature is 1050 DEG C, and total reduction is 53%；By the middle passage of base finish rolling 9, total reduction is 57%, essence
It is 840 DEG C to roll start rolling temperature, and finishing temperature is 800 DEG C, and the thickness of steel plate is 60mm after finish rolling.
Stacking slow cooling operation, 680 DEG C are cooled to using rear fast cooling device is rolled by the steel plate after finish rolling, afterwards carry out steel plate
Stacking treatment, the stacking time is 24h.
Tempering and Quenching operation, carries out the offline Tempering and Quenching of steel plate after rolling：Steel plate is reheated to 930 DEG C,
Quenched after insulation 40min, be then tempered, 620 DEG C of temperature, tempering heat insulating coefficient is 1min/mm, and tempering time is reaching
Start to calculate to actual temperature, obtain 780MPa grades of quenching and tempering type water-power steel plate.
Its metallographic structure is tempered sorbite as shown in Figure 2.
Embodiment 3
A kind of 780MPa grades of quenching and tempering type water-power steel plate, the weight/mass percentage composition of its chemical composition is：C：0.08%, Si：0.20%,
Mn：1.4%, P：0.009%, S：0.003%, Ni：0.47%, Cr：0.48%, Nb：0.02%, Al：0.06%, Mo：0.30%, V：
0.03, B：0.0010%, balance of Fe and inevitable impurity.
The production method concrete technology of 780MPa grades of quenching and tempering type water-power steel plate is as follows：
Continuous casting working procedure is smelted by the chemical composition smelting molten steel of design and the strand that thickness is 300mm is cast, and it is cast into specification
It is the continuous casting billet of 300*2400*2800mm, stacks of blanks cooling 48h, blank surface checks fed to boiler through scafing.
Strand is heated according to the areas of Lu Nei tetra-, Ith area of heating is heated to 780 DEG C, and total heat time is 1h, the heating of IIth area of heating
To 1100 DEG C, total heat time is 2h, and IIIth area of heating is heated to 1200 DEG C, and total heat time is 2h, and soaking zone temperature is 1200
DEG C, soaking time is 1h.
By strand according to roughing is carried out after the area's homogeneous heatings of Lu Nei tetra-, roughing rolling pass is 8 passages, roughing open rolling temperature
It is 1150 DEG C to spend, and finishing temperature is 1050 DEG C, and total reduction is 53%；By the middle passage of base finish rolling 9, total reduction is 57%, essence
It is 840 DEG C to roll start rolling temperature, and finishing temperature is 800 DEG C, and the thickness of steel plate is 60mm after finish rolling.
Stacking slow cooling operation, 680 DEG C are cooled to using rear fast cooling device is rolled by the steel plate after finish rolling, afterwards carry out steel plate
Stacking treatment, the stacking time is 24h.
Tempering and Quenching operation, carries out the offline Tempering and Quenching of steel plate after rolling：Steel plate is reheated to 930 DEG C,
Quenched after insulation 40min, be then tempered, 640 DEG C of temperature, tempering heat insulating coefficient is 1min/mm, and tempering time is reaching
Start to calculate to actual temperature, obtain 780MPa grades of quenching and tempering type water-power steel plate.
Its metallographic structure is tempered sorbite as shown in Figure 3.
Embodiment 4
A kind of 780MPa grades of quenching and tempering type water-power steel plate, the weight/mass percentage composition of its chemical composition is：C：0.07%, Si：0.12%,
Mn：1.2%, P：0.007%, S：0.005%, Ni：0.45%, Cr：0.50%, Nb：0.01%, Al：0.05%, Mo：0.40%, V：
0.035%, B：0.0020%, balance of Fe and inevitable impurity.
The production method concrete technology of 780MPa grades of quenching and tempering type water-power steel plate is as follows：
Continuous casting working procedure is smelted by the chemical composition smelting molten steel of design and the strand that thickness is 300mm is cast, and it is cast into specification
It is the continuous casting billet of 300*2400*2800mm, stacks of blanks cooling 48h, blank surface checks fed to boiler through scafing.
Strand is heated according to the areas of Lu Nei tetra-, Ith area of heating is heated to 790 DEG C, and total heat time is 40min, heats IIth area
1100 DEG C are heated to, total heat time is 100min, IIIth area of heating is heated to 1210 DEG C, and total heat time is 100min, soaking
Area's temperature is 1190 DEG C, and soaking time is 50min.
By strand according to roughing is carried out after the area's homogeneous heatings of Lu Nei tetra-, roughing rolling pass is 8 passages, roughing open rolling temperature
It is 1180 DEG C to spend, and finishing temperature is 1070 DEG C, and total reduction is 53%；By the middle passage of base finish rolling 9, total reduction is 57%, essence
It is 860 DEG C to roll start rolling temperature, and finishing temperature is 820 DEG C, and the thickness of steel plate is 60mm after finish rolling.
Stacking slow cooling operation, 700 DEG C are cooled to using rear fast cooling device is rolled by the steel plate after finish rolling, afterwards carry out steel plate
Stacking treatment, the stacking time is 26h.
Tempering and Quenching operation, carries out the offline Tempering and Quenching of steel plate after rolling：Steel plate is reheated to 930 DEG C,
Quenched after insulation 40min, be then tempered, 630 DEG C of temperature, tempering heat insulating coefficient is 1min/mm, and tempering time is reaching
Start to calculate to actual temperature, obtain 780MPa grades of quenching and tempering type water-power steel plate.
Its metallographic structure is tempered sorbite as shown in Figure 4.
Embodiment 5
A kind of 780MPa grades of quenching and tempering type water-power steel plate, the weight/mass percentage composition of its chemical composition is：C：0.09%, Si：0.22%,
Mn：1.3%, P：0.010%, S：0.004%, Ni：0.60%, Cr：0.40%, Nb：0.03%, Al：0.07%, Mo：0.35%, V：
0.04%, B：0.0015%, balance of Fe and inevitable impurity.
The production method concrete technology of 780MPa grades of quenching and tempering type water-power steel plate is as follows：
Continuous casting working procedure is smelted by the chemical composition smelting molten steel of design and the strand that thickness is 300mm is cast, and it is cast into specification
It is the continuous casting billet of 300*2400*2800mm, stacks of blanks cooling 48h, blank surface checks fed to boiler through scafing.
Strand is heated according to the areas of Lu Nei tetra-, Ith area of heating is heated to 770 DEG C, and total heat time is 80min, heats IIth area
1100 DEG C are heated to, total heat time is 140min, IIIth area of heating is heated to 1190 DEG C, and total heat time is 140min, soaking
Area's temperature is 1210 DEG C, and soaking time is 70min.
By strand according to roughing is carried out after the area's homogeneous heatings of Lu Nei tetra-, roughing rolling pass is 8 passages, roughing open rolling temperature
It is 1120 DEG C to spend, and finishing temperature is 1030 DEG C, and total reduction is 53%；By the middle passage of base finish rolling 9, total reduction is 57%, essence
It is 820 DEG C to roll start rolling temperature, and finishing temperature is 780 DEG C, and the thickness of steel plate is 60mm after finish rolling.
Stacking slow cooling operation, 660 DEG C are cooled to using rear fast cooling device is rolled by the steel plate after finish rolling, afterwards carry out steel plate
Stacking treatment, the stacking time is 22h.
Tempering and Quenching operation, carries out the offline Tempering and Quenching of steel plate after rolling：Steel plate is reheated to 930 DEG C,
Quenched after insulation 40min, be then tempered, 610 DEG C of temperature, tempering heat insulating coefficient is 1min/mm, and tempering time is reaching
Start to calculate to actual temperature, obtain 780MPa grades of quenching and tempering type water-power steel plate.
Its metallographic structure is tempered sorbite as shown in Figure 5.
The mechanical property of the embodiment 1-5 of table 1
| Embodiment | Yield strength/MPa | Tensile strength/MPa | Elongation after fracture/% | - 40 DEG C of ballistic work/J | Welding cold cracking is quick |
| 1 | 790 | 868 | 19 | 181 | 0.22 |
| 2 | 771 | 821 | 20 | 201 | 0.22 |
| 3 | 768 | 811 | 20 | 215 | 0.22 |
| 4 | 776 | 815 | 19 | 210 | 0.22 |
| 5 | 777 | 813 | 20 | 223 | 0.22 |
Knowable to the process ration result of study in the above embodiments, the present invention obtains the low-welding crack of excellent mechanical performances
The quenching-and-tempering process of sensitiveness water-power steel is：930℃/40min+（600~640）℃/60min.Mechanical property now
Can result be：Room-temperature yield strength >=690MPa, 770~930MPa of tensile strength, elongation after fracture >=17%, -40 DEG C of ballistic works
>=100J, welding cold cracking Sensitivity Index Pcm≤0.23.
Above example is only used to illustrative and not limiting technical scheme, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those within the art that：Still the present invention can be modified or be waited
With replacement, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover in power of the invention
In the middle of sharp claimed range.
Claims (10)
1. a kind of 780MPa grades of quenching and tempering type water-power steel plate, it is characterised in that the steel plate chemical composition and its quality percentage contain
Amount is as follows：C：0.07~0.09%, Si：0.12~0.22%, Mn：1.2~1.4%, P≤0.010%, S≤0.005%, Ni：0.45
~0.6%, Cr：0.4~0.5%, Nb：0.01~0.03%, Al：0.05~0.07%, Mo：0.30~0.40%, V：0.03~
0.04%, B：0.0010~0.0020%, balance of Fe and inevitable impurity.
2. 780MPa grades of quenching and tempering type water-power steel plate according to claim 1, it is characterised in that the steel plate quenching state
Metallographic structure is ferrite bainite, and be finally tempered state is organized as tempered sorbite.
3. 780MPa grades of quenching and tempering type water-power steel plate according to claim 1 and 2, it is characterised in that the steel plate room temperature
Yield strength >=690MPa, tensile strength is 770~930MPa, elongation after fracture >=17%, -40 DEG C of ballistic work >=100J.
4. 780MPa grades of quenching and tempering type water-power steel plate according to claim 1 and 2, it is characterised in that the steel plate impact
Specimen size is 10 × 10 × 55mm, welding cold cracking Sensitivity Index Pcm≤0.23.
5. based on the 780MPa grades of production method of quenching and tempering type water-power steel plate described in claim 1-4 any one, its feature
It is that the production method includes smelting continuous casting working procedure, heating process, rolling process, stacking slow cooling operation, Tempering and Quenching work
Sequence；It is described smelt continuous casting working procedure by design chemical composition smelting molten steel and cast thickness be 300mm strand, strand chemistry into
Divide and its weight/mass percentage composition is as follows：C：0.07~0.09%, Si：0.12~0.22%, Mn：1.2~1.4%, P≤0.010%, S
≤ 0.005%, Ni：0.45~0.6%, Cr：0.4~0.5%, Nb：0.01~0.03%, Al：0.05~0.07%, Mo：0.30~
0.40%, V：0.03~0.04%, B：0.0010~0.0020%, balance of Fe and inevitable impurity.
6. the production method of 780MPa grades of quenching and tempering type water-power steel plate according to claim 5, it is characterised in that it is described plus
Thermal technology's sequence, strand is heated according to the areas of Lu Nei tetra-, and Ith area of heating is heated to 780 ± 10 DEG C, and total heat time is 1h ± 20min, plus
Hot IIth area is heated to 1100 DEG C, and total heat time is 2h ± 20min, and IIIth area of heating is heated to 1200 ± 10 DEG C, total heat time
It is 2h ± 20min, soaking zone temperature is 1200 ± 10 DEG C, and soaking time is 1h ± 10min.
7. the production method of 780MPa grades of quenching and tempering type water-power steel plate according to claim 5, it is characterised in that described to roll
Operation processed, by strand according to roughing is carried out after the area's homogeneous heatings of Lu Nei tetra-, roughing rolling pass is 8 passages, roughing open rolling temperature
It is 1150 ± 30 DEG C to spend, and finishing temperature is 1050 ± 20 DEG C, and total reduction is 53%；By the middle passage of base finish rolling 9, total reduction
It is 57%, finish rolling start rolling temperature is 840 ± 20 DEG C, finishing temperature is 800 ± 20 DEG C.
8. the 780MPa grades of production method of quenching and tempering type water-power steel plate according to claim 5-7 any one, its feature
It is that the steel plate after finish rolling is cooled to 680 ± 20 DEG C, afterwards by steel by the stacking slow cooling operation using rear fast cooling device is rolled
Plate carries out stacking treatment, and the stacking time is 24 ± 2h.
9. the 780MPa grades of production method of quenching and tempering type water-power steel plate according to claim 5-7 any one, its feature
It is that the Tempering and Quenching operation carries out the offline Tempering and Quenching of steel plate after rolling：Steel plate is reheated to 930 DEG C,
Quenched after insulation 40min, be then tempered, 600~640 DEG C of temperature, tempering heat insulating coefficient is 1min/mm, during tempering
Between with reach actual temperature start calculate, obtain 780MPa grades of quenching and tempering type water-power steel plate.
10. the 780MPa grades of production method of quenching and tempering type water-power steel plate according to claim 5-7 any one, its feature
It is, the steel plate maximum gauge 60mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107723606A (en) * | 2017-09-11 | 2018-02-23 | 河钢股份有限公司 | 780MPa level low-carbon bainite steel plates and its production method |
| CN109680211A (en) * | 2018-12-28 | 2019-04-26 | 首钢集团有限公司 | A kind of manufacturing method of vehicle structure steel and its manufacturing method and automobile structure |
| CN110846564A (en) * | 2019-09-30 | 2020-02-28 | 邯郸钢铁集团有限责任公司 | Low-cost high-strength beam steel 750L and production method thereof |
| CN113388775A (en) * | 2021-06-03 | 2021-09-14 | 南京钢铁股份有限公司 | Production method of 1000 MPa-grade high-strength steel plate for hydroelectric engineering |
| CN116240470A (en) * | 2023-03-22 | 2023-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of super-thick steel plate with strength of more than 690MPa |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007063603A (en) * | 2005-08-30 | 2007-03-15 | Jfe Steel Kk | 780 mpa class high tensile strength steel sheet and its manufacturing method |
| CN103290339A (en) * | 2013-06-29 | 2013-09-11 | 首钢总公司 | High-strength steel plate for 800MPa hydropower station pressure pipeline and production method thereof |
| CN104532148A (en) * | 2014-12-10 | 2015-04-22 | 南京钢铁股份有限公司 | 800MPa grade low-welding crack sensitive tempering type hydroelectric steel plate |
| CN104711488A (en) * | 2015-02-12 | 2015-06-17 | 舞阳钢铁有限责任公司 | Large-thickness high-strength steel plate for F690 ocean engineering and manufacturing method of steel plate |
-
2017
- 2017-01-12 CN CN201710021397.6A patent/CN106834925A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007063603A (en) * | 2005-08-30 | 2007-03-15 | Jfe Steel Kk | 780 mpa class high tensile strength steel sheet and its manufacturing method |
| CN103290339A (en) * | 2013-06-29 | 2013-09-11 | 首钢总公司 | High-strength steel plate for 800MPa hydropower station pressure pipeline and production method thereof |
| CN104532148A (en) * | 2014-12-10 | 2015-04-22 | 南京钢铁股份有限公司 | 800MPa grade low-welding crack sensitive tempering type hydroelectric steel plate |
| CN104711488A (en) * | 2015-02-12 | 2015-06-17 | 舞阳钢铁有限责任公司 | Large-thickness high-strength steel plate for F690 ocean engineering and manufacturing method of steel plate |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107723606A (en) * | 2017-09-11 | 2018-02-23 | 河钢股份有限公司 | 780MPa level low-carbon bainite steel plates and its production method |
| CN109680211A (en) * | 2018-12-28 | 2019-04-26 | 首钢集团有限公司 | A kind of manufacturing method of vehicle structure steel and its manufacturing method and automobile structure |
| CN110846564A (en) * | 2019-09-30 | 2020-02-28 | 邯郸钢铁集团有限责任公司 | Low-cost high-strength beam steel 750L and production method thereof |
| CN113388775A (en) * | 2021-06-03 | 2021-09-14 | 南京钢铁股份有限公司 | Production method of 1000 MPa-grade high-strength steel plate for hydroelectric engineering |
| CN116240470A (en) * | 2023-03-22 | 2023-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of super-thick steel plate with strength of more than 690MPa |
| CN116240470B (en) * | 2023-03-22 | 2024-01-12 | 湖南华菱湘潭钢铁有限公司 | Production method of super-thick steel plate with strength of more than 690MPa |
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