CN108823489A - A kind of 600MPa grades of water-power steel plate and its production method - Google Patents
A kind of 600MPa grades of water-power steel plate and its production method Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 100
- 239000010959 steel Substances 0.000 title claims abstract description 100
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 77
- 238000000034 method Methods 0.000 claims abstract description 71
- 238000007670 refining Methods 0.000 claims abstract description 48
- 229910052742 iron Inorganic materials 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 36
- 238000009749 continuous casting Methods 0.000 claims abstract description 31
- 238000005496 tempering Methods 0.000 claims abstract description 29
- 238000005096 rolling process Methods 0.000 claims abstract description 24
- 238000003723 Smelting Methods 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 12
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 9
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 238000007711 solidification Methods 0.000 claims description 23
- 230000008023 solidification Effects 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 7
- 230000003009 desulfurizing effect Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 7
- 229910001568 polygonal ferrite Inorganic materials 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 7
- 229910001563 bainite Inorganic materials 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 4
- 238000005204 segregation Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 238000005266 casting Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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Abstract
The invention discloses a kind of 600MPa grades of water-power steel plate and its production method, steel plate chemical component composition and mass percentage are：C：0.04-0.07%, Si：0.20-0.30%, Mn：1.30-1.60%, P≤0.012%, S≤0.002%, Als：0.015-0.03%, Ti：0.01-0.02%, Nb：0.02-0.03%, V：0.05-0.06%, Cr：0.20-0.30%, Mo：0.15-0.25%, surplus are iron and inevitable impurity；Production method includes molten iron pretreatment, converter smelting, refining, continuous casting, rolling, cooling, tempering process.600MPa grades of water-power steel plate produced by the invention has high intensity, high-ductility, high tenacity；The big Reduction Technology of continuous casting steel billet improves slab center portion quality, reduces alloy adding, reduces cost.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of 600MPa grades of water-power steel plate and its production method.
Background technique
Water power is the second largest routinely energy that China is only second to coal, and is provided in the renewable at present and non-fossil energy
Source is most clear, and technology is most mature, most cleans the most economical energy.Water power is renewable, pollution-free, operating cost is low, is convenient for
Power peak regulation is conducive to the comprehensive benefit for improving resource utilization and economic society.Therefore greatly developing water power is that future can be again
The emphasis of raw energy development.
Water-power steel generally refers in particular to pressure pipeline steel, in factory dam diversion penstock manufacture and floor, trouble
The auxiliary equipment such as pipe, spiral case.It is more demanding to the intensity of steel plate, plasticity, toughness, weldability.Main use domestic at present
500MPa grades, 600MPa grades and three intensity ranks of 800MPa grade, and develop to high-intensitive, low-welding crack-sensitive.
CN100516270C discloses a kind of thick steel plate with high strength and low welding crack sensitivity and its production method, production
40mm is with chemical component when lower steel plate：C：0.06-0.07%, Si：0.15-0.30%, Mn：1.20-1.50%, P≤0.015%, S
≤ 0.006%, Ni：0.15-0.25%, Mo：0.15-0.25%, Cu：0.05-0.15%, V：0.02-0.04%, Nb：0.005-
0.02%, Als：0.010-0.040%, surplus are Fe and are inevitably mingled with that Pcm maximum value is that 0.187%, Ceq maximum value is
0.404.The design of this method ingredient joined a certain amount of Cu, but Cu is easy to cause steel plate to generate crizzle, it is necessary to add
Enter a certain amount of Ni, causes cost of alloy higher.CN102758138B discloses a kind of thin gauge low-welding crack-sensitive water
It is electric to use steel production method, it also joined Ni element in ingredient design, cost of alloy is higher, while the produced steel plate thickness of this method
Less than 25mm.In view of the above-mentioned problems, the present invention provides a kind of 600MPa grades of water-power steel plate and its production method, steel produced
Plate has high intensity, high-ductility, high tenacity, while improving slab center portion quality using the big Reduction Technology of continuous casting steel billet, reduces and closes
Gold element additional amount reduces production cost.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of 600MPa grades of water-power steel plate and its production methods.
In order to solve the above technical problems, the technical solution adopted by the present invention is that：A kind of 600MPa grades of water-power steel plate, institute
It states steel plate chemical component composition and its mass percentage is：C：0.04-0.07%, Si：0.20-0.30%, Mn：1.30-
1.60%, P≤0.012%, S≤0.0020%, Als：0.015-0.030%, Ti：0.010-0.020%, Nb：0.020-0.030%,
V：0.050-0.060%, Cr：0.20-0.30%, Mo：0.15-0.25%, surplus be iron and inevitable impurity, Pcm≤
0.20%。
Pcm calculation formula is：Pcm（%）=C+Si/30+（Mn+Cu+Cr）/20+Ni/60+Mo/15+V/10+5B.
Steel plate thickness of the present invention is 20-50mm, and steel plate tissue is by quasi-polygonal ferrite, acicular ferrite and bayesian
Body composition.
Yield strength >=530MPa of steel plate of the present invention, tensile strength >=630MPa, elongation percentage >=20%, -20 DEG C of punchings
Hit function >=280J, -20 DEG C of center portion timeliness ballistic work >=200J.
The present invention also provides a kind of production method of 600MPa grades of water-power steel plate, the production method includes that molten iron is pre-
Processing, converter smelting, refining, continuous casting, rolling, cooling, tempering process；The continuous casting working procedure, using the big pressure skill of solidification end
Art, overall reduction >=15mm, wherein solidification end drafts >=10mm, drafts >=5mm after the completion of solidification.
Hot metal pre process procedures of the present invention, using magnesium/lime composite blowing molten iron pretreatment desulfurizing process, after processing
Molten iron S≤0.0020%.
Refining procedure of the present invention accurately controls molten steel composition, S≤0.0015% in molten steel, by RH essence through LF refining
H≤0.00015% in molten steel after refining processing.Steel making working procedure of the present invention is molten iron pretreatment, converter smelting, LF refining, RH are refined,
Continuous casting, pretreated molten iron can occur back sulphur when converter smelting is at molten steel, sulfur content caused to increase；In RH essence after LF refining
It can also happen that returning sulphur in refining and continuous casting process, it requires LF refining sulfur content≤0.0015%, just can guarantee finished product sulfur content
≤0.0020%。
Rolling process of the present invention, roughing heating temperature are 1150-1250 DEG C, and it is cooling that intermediate base is carried out after roughing.
Rolling process of the present invention, entrance finishing temperature≤900 DEG C, finish rolling reduction ratio >=70%, finishing temperature 800-
830℃。
Cooling process of the present invention rolls rear steel plate using supper-fast cooling by water, and final cooling temperature is 500-550 DEG C.
Tempering process of the present invention, 575-625 DEG C of tempering temperature, tempering coefficient is 2.0-3.0min/mm.
600MPa grades of water-power steel plate method for testing performance of the present invention refers to 228.1 metal material stretching test of GB/T
Part 1：Room temperature test method, 229 metal material Charpy pendulum impact test method of GB/T；Center segregation of continuous cast slab
Evaluation method refers to 4003 continuous casting plate slab macrostructure defect judge picture of YB/T.
Generated beneficial effect is by adopting the above technical scheme：1, using present component design and processes controlling party
The 600MPa grade water-power steel plate intensity with higher of method production, steel plate yield strength >=530MPa, steel plate tensile strength >=
630MPa, elongation percentage >=20%, -20 DEG C of ballistic work >=280J, -20 DEG C of center portion timeliness ballistic work >=200J.2, producer of the present invention
Continuous casting working procedure uses the big Reduction Technology of solidification end in method, and overall reduction >=15mm, wherein solidification end drafts >=10mm, coagulates
Gu drafts >=5mm after the completion of guarantees that steel plate core structure is fine and close, while steel plate center segregation is controlled at C0.5 grades hereinafter, having
Conducive to steel plate core structure fine uniform, to guarantee higher intensity and toughness, reduce alloy adding, reduce at
This.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
600MPa grades of water-power steel plate thickness of the present embodiment are 20mm, and chemical component composition and mass percentage are：C：
0.050%, Si：0.23%, Mn：1.35%, P：0.012%, S：0.002%, Als：0.027%, Ti：0.012%, Nb：0.022%, V：
0.051%, Cr：0.20%, Mo：0.16%, surplus is iron and inevitable impurity, Pcm 0.15%.
The production method of 600MPa grades of water-power steel plates of the present embodiment includes molten iron pretreatment, converter smelting, refining, company
Casting, rolling, cooling, tempering process, specific process step are as follows：
（1）Hot metal pre process procedures：Using magnesium/lime composite blowing molten iron pretreatment desulfurizing process, molten iron S after processing：
0.0020%, molten iron enters converter smelting after pretreatment；
（2）Refining procedure：The molten steel that converter smelting finishes enters LF refining, and LF refining accurately controls molten steel composition, steel after refining
S content is 0.0014% in water；H content is 0.00012% in molten steel after RH refining treatment；
（3）Continuous casting working procedure：For molten steel through sheet billet continuous casting at continuous casting billet, continuous casting uses the big pressure of solidification end after LF, RH refining
Technology, overall reduction 15mm, wherein solidification end drafts 10mm, drafts 5mm after the completion of solidification, slab thickness 265mm, plate
Base center segregation is C0.5 grades；
（4）Rolling process：Roughing heating temperature is 1180 DEG C, workpiece thickness 70mm, and it is cooling that intermediate base is carried out after roughing；Essence
900 DEG C of start temperature are rolled, finish rolling total reduction 71%, finishing temperature is 800 DEG C；
（5）Cooling process：Rear steel plate is rolled using supper-fast cooling by water, and final cooling temperature is 550 DEG C；
（6）Tempering process：580 DEG C of tempering temperature, tempering coefficient is 2.25min/mm.
The present embodiment steel plate tissue is made of quasi-polygonal ferrite, acicular ferrite and bainite, and mechanical property is in the wrong
Take intensity：570MPa, tensile strength：680MPa, elongation percentage：24%, -20 DEG C of impact flexibility AKv：330J, -20 DEG C of center portion timeliness
Ballistic work 300J.
Embodiment 2
600MPa grades of water-power steel plate thickness of the present embodiment are 40mm, and chemical component composition and mass percentage are：C：
0.06%, Si：0.26%, Mn：1.50%, P：0.011%, S：0.0018%, Als：0.020%, Ti：0.015%, Nb：0.026%, V：
0.055%, Cr：0.25%, Mo：0.20%, surplus is iron and inevitable impurity, Pcm 0.18%.
The production method of 600MPa grades of water-power steel plates of the present embodiment includes molten iron pretreatment, converter smelting, refining, company
Casting, rolling, cooling, tempering process, specific process step are as follows：
（1）Hot metal pre process procedures：Using magnesium/lime composite blowing molten iron pretreatment desulfurizing process, molten iron S after processing：
0.0015%, molten iron enters converter smelting after pretreatment；
（2）Refining procedure：The molten steel that converter smelting finishes enters LF refining, and LF refining accurately controls molten steel composition, steel after refining
S content is 0.0010% in water；H content is 0.00010% in molten steel after RH refining treatment；
（3）Continuous casting working procedure：For molten steel through sheet billet continuous casting at continuous casting billet, continuous casting uses the big pressure of solidification end after LF, RH refining
Technology, overall reduction 18mm, wherein solidification end drafts 13mm, drafts 5mm after the completion of solidification, slab thickness 262mm, plate
Base center segregation is C0.5 grades；
（4）Rolling process：Roughing heating temperature is 1200 DEG C, workpiece thickness 135mm, and it is cooling that intermediate base is carried out after roughing；
880 DEG C of entrance finishing temperature, finish rolling total reduction 70%, finishing temperature is 815 DEG C；
（5）Cooling process：Rear steel plate is rolled using supper-fast cooling by water, and final cooling temperature is 515 DEG C；
（6）Tempering process：600 DEG C of tempering temperature, tempering coefficient is 2.5min/mm.
The present embodiment steel plate tissue is made of quasi-polygonal ferrite, acicular ferrite and bainite, and mechanical property is in the wrong
Take intensity：565MPa, tensile strength：660MPa, elongation percentage：22.5%, -20 DEG C of impact flexibility AKv：When 300J, -20 DEG C of center portions
Imitate ballistic work 240J.
Embodiment 3
600MPa grades of water-power steel plate thickness of the present embodiment are 50mm, and chemical component composition and mass percentage are：C：
0.07%, Si：0.30%, Mn：1.59%, P：0.010%, S：0.0015%, Als：0.028%, Ti：0.018%, Nb：0.028%, V：
0.059%, Cr：0.29%, Mo：0.23%, surplus is iron and inevitable impurity, Pcm 0.20%.
The production method of 600MPa grades of water-power steel plates of the present embodiment includes molten iron pretreatment, converter smelting, refining, company
Casting, rolling, cooling, tempering process, specific process step are as follows：
（1）Hot metal pre process procedures：Using magnesium/lime composite blowing molten iron pretreatment desulfurizing process, molten iron S after processing：
0.0010%, molten iron enters converter smelting after pretreatment；
（2）Refining procedure：The molten steel that converter smelting finishes enters LF refining, and LF refining accurately controls molten steel composition, steel after refining
S content is 0.0010% in water；H content is 0.00010% in molten steel after RH refining treatment；
（3）Continuous casting working procedure：For molten steel through sheet billet continuous casting at continuous casting billet, continuous casting uses the big pressure of solidification end after LF, RH refining
Technology, overall reduction 20mm, wherein solidification end drafts 15mm, drafts 5mm after the completion of solidification, slab thickness 260mm, plate
Base center segregation is C0.5 grades；
（4）Rolling process：Roughing heating temperature is 1230 DEG C, workpiece thickness 170mm, and it is cooling that intermediate base is carried out after roughing；
865 DEG C of entrance finishing temperature, finish rolling total reduction 70.5%, finishing temperature is 825 DEG C；
（5）Cooling process：Rear steel plate is rolled using supper-fast cooling by water, and final cooling temperature is 500 DEG C；
（6）Tempering process：610 DEG C of tempering temperature, tempering coefficient is 2.8min/mm.
The present embodiment steel plate tissue is made of quasi-polygonal ferrite, acicular ferrite and bainite, and mechanical property is in the wrong
Take intensity：540MPa, tensile strength：645MPa, elongation percentage：21%, -20 DEG C of impact flexibility AKv：285J, -20 DEG C of center portion timeliness
Ballistic work 220J.
Embodiment 4
600MPa grades of water-power steel plate thickness of the present embodiment are 30mm, and chemical component composition and mass percentage are：C：
0.05%, Si：0.20%, Mn：1.30%, P：0.008%, S：0.0020%, Als：0.015%, Ti：0.010%, Nb：0.020%, V：
0.050%, Cr：0.30%, Mo：0.15%, surplus is iron and inevitable impurity, Pcm 0.15%.
The production method of 600MPa grades of water-power steel plates of the present embodiment includes molten iron pretreatment, converter smelting, refining, company
Casting, rolling, cooling, tempering process, specific process step are as follows：
（1）Hot metal pre process procedures：Using magnesium/lime composite blowing molten iron pretreatment desulfurizing process, molten iron S after processing：
0.0012%, molten iron enters converter smelting after pretreatment；
（2）Refining procedure：The molten steel that converter smelting finishes enters LF refining, and LF refining accurately controls molten steel composition, steel after refining
S content is 0.0015% in water；H content is 0.00015% in molten steel after RH refining treatment；
（3）Continuous casting working procedure：For molten steel through sheet billet continuous casting at continuous casting billet, continuous casting uses the big pressure of solidification end after LF, RH refining
Technology, overall reduction 25mm, wherein solidification end drafts 18mm, drafts 7mm after the completion of solidification, slab thickness 255mm, plate
Base center segregation is 0 grade；
（4）Rolling process：Roughing heating temperature is 1150 DEG C, workpiece thickness 105mm, and it is cooling that intermediate base is carried out after roughing；
895 DEG C of entrance finishing temperature, finish rolling total reduction 71.4%, finishing temperature is 830 DEG C；
（5）Cooling process：Rear steel plate is rolled using supper-fast cooling by water, and final cooling temperature is 535 DEG C；
（6）Tempering process：575 DEG C of tempering temperature, tempering coefficient is 2.0min/mm.
The present embodiment steel plate group is woven to quasi-polygonal ferrite, acicular ferrite and bainite composition, and mechanical property is in the wrong
Take intensity：545MPa, tensile strength：655MPa, elongation percentage：22%, -20 DEG C of impact flexibility AKv：295J, -20 DEG C of center portion timeliness
Ballistic work 223J.
Embodiment 5
600MPa grades of water-power steel plate thickness of the present embodiment are 35mm, and chemical component composition and mass percentage are：C：
0.04%, Si：0.30%, Mn：1.60%, P：0.005%, S：0.0012%, Als：0.030%, Ti：0.020%, Nb：0.030%, V：
0.060%, Cr：0.20%, Mo：0.25%, surplus is iron and inevitable impurity, Pcm 0.16%.
The production method of 600MPa grades of water-power steel plates of the present embodiment includes molten iron pretreatment, converter smelting, refining, company
Casting, rolling, cooling, tempering process, specific process step are as follows：
（1）Hot metal pre process procedures：Using magnesium/lime composite blowing molten iron pretreatment desulfurizing process, molten iron S after processing：
0.0009%, molten iron enters converter smelting after pretreatment；
（2）Refining procedure：The molten steel that converter smelting finishes enters LF refining, and LF refining accurately controls molten steel composition, steel after refining
S content is 0.0007% in water；H content is 0.00012% in molten steel after RH refining treatment；
（3）Continuous casting working procedure：For molten steel through sheet billet continuous casting at continuous casting billet, continuous casting uses the big pressure of solidification end after LF, RH refining
Technology, overall reduction 22mm, wherein solidification end drafts 16mm, drafts 6mm after the completion of solidification, slab thickness 258mm, plate
Base center segregation is C0.5 grades；
（4）Rolling process：Roughing heating temperature is 1250 DEG C, workpiece thickness 120mm, and it is cooling that intermediate base is carried out after roughing；
885 DEG C of entrance finishing temperature, finish rolling total reduction 70.8%, finishing temperature is 815 DEG C；
（5）Cooling process：Rear steel plate is rolled using supper-fast cooling by water, and final cooling temperature is 520 DEG C；
（6）Tempering process：625 DEG C of tempering temperature, tempering coefficient is 3.0min/mm.
The present embodiment steel plate group is woven to quasi-polygonal ferrite, acicular ferrite and bainite composition, and mechanical property is in the wrong
Take intensity：556MPa, tensile strength：675MPa, elongation percentage：23%, -20 DEG C of impact flexibility AKv：305J, -20 DEG C of center portion timeliness
Ballistic work 225J.
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 600MPa grades of water-power steel plate, which is characterized in that the steel plate chemical component composition and its mass percentage
For：C：0.04-0.07%, Si：0.20-0.30%, Mn：1.30-1.60%, P≤0.012%, S≤0.0020%, Als：0.015-
0.030%, Ti：0.010-0.020%, Nb：0.020-0.030%, V：0.050-0.060%, Cr：0.20-0.30%, Mo：0.15-
0.25%, surplus is iron and inevitable impurity, Pcm≤0.20%.
2. a kind of 600MPa grades of water-power steel plates according to claim 1, which is characterized in that the steel plate thickness is 20-
50mm, steel plate tissue are made of quasi-polygonal ferrite, acicular ferrite and bainite.
3. a kind of 600MPa grades of water-power steel plates according to claim 1, which is characterized in that the yield strength of the steel plate
>=530MPa, tensile strength >=630MPa, elongation percentage >=20%, -20 DEG C of ballistic work >=280J, -20 DEG C of center portion timeliness ballistic works >=
200J。
4. based on a kind of production method of 600MPa grades of water-power steel plate described in claim 1-3 any one, feature exists
In the production method includes molten iron pretreatment, converter smelting, refining, continuous casting, rolling, cooling, tempering process；The continuous casting
Process, using the big Reduction Technology of solidification end, overall reduction >=15mm, wherein solidification end drafts >=10mm, solidification are completed
Drafts >=5mm afterwards.
5. a kind of production method of 600MPa grades of water-power steel plates according to claim 4, which is characterized in that the molten iron
Pretreatment process, using magnesium/lime composite blowing molten iron pretreatment desulfurizing process, molten iron S≤0.0020% after processing.
6. a kind of production method of 600MPa grades of water-power steel plates according to claim 4, which is characterized in that the refining
Process accurately controls molten steel composition through LF refining, S≤0.0015% in molten steel, after RH refining treatment H in molten steel≤
0.00015%。
7. a kind of production method of 600MPa grades of water-power steel plate, feature according to claim 4-6 any one exist
In the rolling process, roughing heating temperature is 1150-1250 DEG C, and it is cooling that intermediate base is carried out after roughing.
8. a kind of production method of 600MPa grades of water-power steel plate, feature according to claim 4-6 any one exist
In the rolling process, entrance finishing temperature≤900 DEG C, finish rolling reduction ratio >=70%, finishing temperature is 800-830 DEG C.
9. a kind of production method of 600MPa grades of water-power steel plate, feature according to claim 4-6 any one exist
In the cooling process rolls rear steel plate using supper-fast cooling by water, and final cooling temperature is 500-550 DEG C.
10. a kind of production method of 600MPa grades of water-power steel plate, feature according to claim 4-6 any one exist
In the tempering process, 575-625 DEG C of tempering temperature, tempering coefficient is 2.0-3.0min/mm.
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| CN113249659B (en) * | 2021-04-15 | 2022-01-18 | 首钢集团有限公司 | High-strength anti-crack steel with excellent ductility and preparation method thereof |
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Denomination of invention: A 600MPa grade steel plate for hydropower and its production method Granted publication date: 20200703 Pledgee: Bank of Cangzhou Limited by Share Ltd. Yutian branch Pledgor: TANGSHAN HEAVY PLATE CO.,LTD.|TANGSHAN IRON&STEEL GROUP Co.,Ltd.|HBIS COMPANY LIMITED TANGSHAN BRANCH Registration number: Y2024980001649 |