CN105925893A - S355NL low-carbon high-toughness low alloy steel plate of 250 mm thickness and manufacturing method thereof - Google Patents
S355NL low-carbon high-toughness low alloy steel plate of 250 mm thickness and manufacturing method thereof Download PDFInfo
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- CN105925893A CN105925893A CN201610460071.9A CN201610460071A CN105925893A CN 105925893 A CN105925893 A CN 105925893A CN 201610460071 A CN201610460071 A CN 201610460071A CN 105925893 A CN105925893 A CN 105925893A
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
Abstract
The invention relates to an S355NL low-carbon high-toughness low alloy steel plate of 250 mm thickness. The steel plate is made of, by weight percentage, 0.07-0.14% of C, 0.15-0.25% of Si, 1.40-1.60% of Mn, less than or equal to 0.006% of P, less than or equal to 0.001% of S, 0.02-0.06% of Al, 0.02-0.05% of Nb, 0.02-0.05% of V, 0.30-0.50% of Ni and the balance Fe and unavoidable impurity elements. A manufacturing process of the steel plate comprises the steps of KR pretreatment, smelting conducted through a revolving furnace, LF refining, RH refining, slab continuous casting, slab slow cooling, slab heating, steel plate rolling, steel plate slow cooling, flaw detection, normalization, finishing, inspection and warehousing. A continuous casting billet of 450 mm thickness is adopted for manufacturing the steel plate; the heat treatment process is simple; production cost is low; the steel plate is suitable for mass production; and after normalization, the steel plate achieves excellent low temperature impact toughness and good comprehensive mechanical performance.
Description
Technical field
The invention belongs to steel plate and manufacture field, being specifically related to a kind of thickness is 250mm low carbon and high ductility low-alloy S355NL
Steel plate and manufacture method thereof.
Background technology
Low-alloy super-thick steel plate is mainly used in the field important feature parts such as wind-powered electricity generation, bridge, water power, the inside matter to product
Amount, welding performance, low temperature impact properties and anti-lamellar tearing performance have strict demand.Steel plate thickness is the biggest, its internal defect,
The metallurgical imperfections such as segregation are the most serious, and along with the increase of steel plate thickness there will be coarse-grain in various degree and mixed crystal, finally lead
Causing steel plate impact flexibility to be substantially deteriorated, especially-50 DEG C of heart portion ballistic work fluctuation is relatively big, has had a strong impact on steel plate at extremely frigid zones
Use.
Notification number is that the patent of invention of CN103014283A relates to " a kind of continuous casting steel billet production power station super-thick steel plate
Manufacture method ", it is provided that a kind of-40 DEG C of ballistic works use austenitizing in the super-thick steel plate of more than 150J, its Technology for Heating Processing
Quenching+intercritical hardening+high tempering, complex process, production cost is high, and steel plate maximum gauge only has 150mm, it is impossible to meet city
To the increasing demand of steel plate thickness.
Notification number is that the patent of invention of CN104962814A relates to one " a kind of normalizing high-strength tenacity 150mm super-thick steel plate
And production method ", it is provided that a kind of-60 DEG C of ballistic works at the super-thick steel plate of ＞ 40-150J, its production technology use controlled rolling+
Normalizing+weak cold, although low-temperature impact toughness can meet-60 DEG C of requirements, but ballistic work fluctuation range is relatively big, and steel plate maximum is thick
Degree only 150mm, can not meet market equally to the increasing demand of steel plate thickness.
Notification number be the patent of invention of CN104911475A relate to one " in a kind of low-carbon (LC) manganese high-strength tenacity super-thick steel plate and
Its preparation method ", it is provided that a kind of-60 DEG C of ballistic works are at the super-thick steel plate of ＞ 100J, and its Technology for Heating Processing uses and quenches+return
Fire, although-60 DEG C of ballistic works can be met there is bigger surplus, but steel plate maximum gauge only has 140mm, city can not be met equally
To the increasing demand of steel plate thickness.
Notification number is that the patent of invention of CN102029305A relates to one " production method of a kind of super-thick steel plate ", it is provided that
A kind of super-thick steel plate, the design of its composition is simple, and need not heat treatment, but can only meet-20 DEG C of impact requirements, and steel plate maximum is thick
Degree only 150mm, can not meet market equally to the increasing demand of steel plate thickness.
Summary of the invention
The technical problem to be solved is to provide a kind of thickness to be the S355NL of 250mm for above-mentioned prior art
Low carbon and high ductility low-alloy super-thick steel plate, can be applicable to the manufacture of the important feature parts such as wind-powered electricity generation and bridge, has good interior
Portion's quality, excellent low-temperature impact toughness and good comprehensive mechanical performance.
Another object of the present invention is to provide the manufacture method of a kind of low carbon and high ductility low-alloy super-thick steel plate.Use 450mm
Continuous casting billet produce, Technology for Heating Processing use normalized treatment, it is ensured that 250mm thickness steel plate have excellence low-temperature impact toughness and
Good comprehensive mechanical performance, wherein-50 DEG C of ballistic works are at more than 150J.Product processes of the present invention is simple, is suitable for batch
Produce, there is presently no and disclose similar steel product.
The present invention solves the technical scheme that above-mentioned technical problem used, the S355NL low-carbon (LC) high-ductility that a kind of 250mm is thick
Property low alloy steel plate, the chemical composition of this steel plate is C:0.07～0.14% by weight percentage, Si:0.15～0.25%, Mn:
1.40～1.60%, P :≤0.006%, S :≤0.001%, Al:0.02～0.06%, Nb:0.02～0.05%, V:0.02～
0.05%, Ni:0.30～0.50%, surplus is Fe and inevitable impurity element.
Further, the invention belongs to 250mm thickness S355NL low carbon and high ductility low-alloy super-thick steel plate, its mechanical performance is full
Foot: yield strength >=325Mpa, tensile strength >=500Mpa, elongation after fracture >=30% ,-50 DEG C of heart portion impact of collision merit monodrome
>=150J, thickness direction Tensile fracture shrinkage factor >=60%.Steel plate UT flaw detection can meet NB/T47013.3 I level requirement.
The chemical composition of low carbon and high ductility S355NL low-alloy super-thick steel plate of the present invention is determined such that
The composition of the present invention mainly uses low-carbon (LC), low-sulfur phosphorus, Nb+V microalloying ingredient to design, and adds appropriate Ni element simultaneously,
Improve low-temperature impact toughness.Chemical element effect in steel is as follows:
C: carbon can significantly improve the intensity of steel plate, but steel plate can be made during too high levels moulding and impact flexibility variation, this patent
Carbon content control is 0.07～0.14%.
Mn: manganese is good deoxidizer and desulfurizing agent in steelmaking process, can improve armor plate strength and toughness, but content
Too high meeting causes continuous casting slab segregation serious, and this patent Fe content controls 1.40～1.60%.
Si: silicon is to be good reducing agent and deoxidizer in steelmaking process, but too high levels can reduce impact flexibility and
Plate surface quality, this patent silicone content controls 0.15～0.25%.
P: phosphorus is harmful element, increases the cold brittleness of steel, makes plasticity and welding performance be deteriorated, should reduce, this patent as far as possible
Phosphorus content controls below 0.006%.
S: sulfur is harmful element, increases the red brittleness of steel, reduces toughness and ductility, unfavorable to welding performance, should try one's best
Reducing, this patent sulfur content controls below 0.001%.
Ni: nickel can significantly improve low-temperature impact toughness, can improve intensity simultaneously, but can increase production cost, should control
Using, this patent nickel content controls 0.30～0.50%.
Nb, V: niobium, vanadium microalloy element form carbonitride with C, N element, have postponement austenite recrystallization, refine ferrum
The effect of ferritic crystal grain, can improve armor plate strength and toughness simultaneously, this patent Nb content control 0.02～0.05%, V content
Control 0.02～0.05%.
The manufacture method of above-mentioned low carbon and high ductility 250mm low-alloy super-thick steel plate.
The technological process of production: KR pretreatment → converter smelting → LF refine → RH refine → sheet billet continuous casting → slab slow cooling →
Heating of plate blank → steel plate rolling → steel plate slow cooling → flaw detection → normalizing → finishing → inspection → warehouse-in.
The concrete operations of master operation are as follows,
1) smelting process
Use 450mm continuous casting steel billet to produce, improve Molten Steel Cleanliness, reduction by reducing S, P, H, O, N element content in steel
Strand segregation, raw materials for metallurgy, through KR molten iron pretreatment, takes off Slag treatment after converter smelting, strictly control S≤0.001%, P≤
0.006%, H≤1.2ppm, O≤20ppmm, N≤40ppm；Control strand by continuous casting working procedure dynamic soft reduction technology and be segregated in C
Class less than 1.0 grades, loosens below 0.5 grade；Slab roll off the production line after covering slow cooling more than 48 hours, it is ensured that the hydrogen in steel fully expands
Dissipate.
2) heating, rolling mill practice
450mm continuous casting steel billet uses zone heating mode: total heat time heating time is 550～650min, and the first bringing-up section temperature is
1050～1150 DEG C, the second bringing-up section temperature is 1200～1260 DEG C, and soaking zone temperature is 1180～1250 DEG C, the second bringing-up section
Heat time heating time total with soaking zone >=300min, it is ensured that strand segregation is fully spread.
Rolling process uses " the big pressure of high temperature " technique, makes loose abundant pressing, improves internal quality of steel plate and heart portion is low
Temperature impact flexibility.Start rolling temperature is 1060-1100 DEG C, and finishing temperature is 980-1020 DEG C, single pass drafts be 50mm and with
On, 3-4 passage completes rolling.
Steel plate roll off the production line after stacking slow cooling >=72 hour, fully expand hydrogen.
3) Technology for Heating Processing
Using normalizing process, normalizing temperature is 900 ± 10 DEG C, and temperature retention time coefficient: 2.4～2.6min/mm is air-cooled；In order to protect
Cooling effect after card normalizing, steel plate is individually put after rolling off the production line.
Compared with prior art, the present invention has a characteristic that
The present invention relates to a kind of 250mm thickness S355NL low carbon and high ductility low-alloy super-thick steel plate, this steel plate uses 450mm continuous casting billet
Produce, there is after normalizing the low-temperature impact toughness of excellence and good comprehensive mechanical performance.
To achieve these goals, the present invention uses low carbon component to design, by improving Molten Steel Cleanliness and continuous casting steel billet
Internal soundness improves steel plate low-temperature impact toughness, key measures: 1) by reducing S, P, H, O, N element content raising steel
Water degree of purity；2) strand segregation and rarefaction defect are alleviated by dynamic soft reduction of continuous casting technology；3) by reducing carbon content, interpolation
Ni element and improve Molten Steel Cleanliness and improve steel plate low-temperature impact toughness, use the design of Nb+V microalloying ingredient make up by
Decline in reducing the intensity brought of carbon content, it is ensured that there is after steel plate normalizing the low-temperature impact toughness of excellence and good comprehensive
Mechanical performance；4) make segregation fully spread heat time heating time by prolongation blank high temperature section, use high temperature big pressure rolling work simultaneously
Skill makes loose abundant pressing, and then improves internal quality of steel plate and heart portion low-temperature impact toughness；5) by air-cooled after normalizing, prevent
The ferrite crystal grain that causes the most slowly of cooling is thick causes steel plate low-temperature impact toughness to decline.
Compared with prior art, steel plate of the present invention uses 450mm continuous casting billet to produce, and Technology for Heating Processing is simple, production cost
Relatively low, it is suitable for batch production.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1
The thickness of the S355NL steel plate of the present embodiment is 250mm, and its chemical composition is by weight percentage: C:0.11%, Si:
0.22%, Mn:1.51%, P:0.005%, S:0.0008%, Nb:0.035%, V:0.035%, Alt:0.032%, Ni:0.40%, H:
0.00006%, O:0.0012%, N:0.0026%, surplus is Fe and inevitable impurity element.
The manufacturing process of this steel plate is as follows:
450mm thickness continuous casting steel billet is used to produce, production process route: KR pretreatment → converter smelting → LF refine → RH refine →
Sheet billet continuous casting → slab slow cooling → heating of plate blank → steel plate rolling → steel plate slow cooling → flaw detection → normalizing → finishing → check → enter
Storehouse.
1) smelting process
Use 450mm continuous casting steel billet to produce, improve Molten Steel Cleanliness, reduction by reducing S, P, H, O, N element content in steel
Strand segregation, raw materials for metallurgy, through KR molten iron pretreatment, takes off Slag treatment after converter smelting, strictly control S≤0.001%, P≤
0.006%, H≤1.2ppm, O≤20ppmm, N≤40ppm；Control strand by continuous casting working procedure dynamic soft reduction technology and be segregated in C
Class less than 1.0 grades, loosens below 0.5 grade；Slab roll off the production line after covering slow cooling more than 48 hours, it is ensured that the hydrogen in steel fully expands
Dissipate.
2) heating, rolling mill practice
450mm continuous casting steel billet uses zone heating mode: total heat time heating time is 600min, and the first bringing-up section temperature is 1120 DEG C,
Second bringing-up section temperature is 1240 DEG C, and soaking zone temperature is 1220 DEG C, the second bringing-up section and soaking zone total heat time heating time >=
300min, it is ensured that strand segregation is fully spread.
Rolling process uses " the big pressure of high temperature " technique, makes loose abundant pressing, improves internal quality of steel plate and heart portion property
Energy.Start rolling temperature is 1080 DEG C, and finishing temperature is 1000 DEG C, and single pass drafts is 50mm, and 4 passages complete rolling.
Steel plate roll off the production line after stacking slow cooling >=72 hour, fully expand hydrogen.
3) Technology for Heating Processing
Using normalizing process, normalizing temperature is 900 ± 10 DEG C, and temperature retention time coefficient: 2.5min/mm is air-cooled；In order to ensure normalizing
Rear cooling effect, steel plate is individually put after rolling off the production line.
The 250mm thickness S355NL low carbon and high ductility super-thick steel plate prepared via above-mentioned manufacturing process, UT flaw detection meets NB/
T47013.3 standard I level requirement, low-temperature impact toughness and the good comprehensive mechanical performance with excellence refer to table 1.
Embodiment 2
The thickness of the S355NL steel plate of the present embodiment is 250mm, and its chemical composition is by weight percentage: C:0.12%, Si:
0.20%, Mn:1.52%, P:0.004%, S:0.0005%, Nb:0.032%, V:0.035%, Alt:0.030%, Ni:0.42%, H:
0.00005%, O:0.0010%, N:0.0024%, surplus is Fe and inevitable impurity element.
The manufacturing process of this steel plate is as follows:
450mm thickness continuous casting steel billet is used to produce, production process route: KR pretreatment → converter smelting → LF refine → RH refine →
Sheet billet continuous casting → slab slow cooling → heating of plate blank → steel plate rolling → steel plate slow cooling → flaw detection → normalizing → finishing → check → enter
Storehouse.
1) smelting process
Use 450mm continuous casting steel billet to produce, improve Molten Steel Cleanliness, reduction by reducing S, P, H, O, N element content in steel
Strand segregation, raw materials for metallurgy, through KR molten iron pretreatment, takes off Slag treatment after converter smelting, strictly control S≤0.001%, P≤
0.006%, H≤1.2ppm, O≤20ppmm, N≤40ppm；Control strand by continuous casting working procedure dynamic soft reduction technology and be segregated in C
Class less than 1.0 grades, loosens below 0.5 grade；Slab roll off the production line after covering slow cooling more than 48 hours, it is ensured that the hydrogen in steel fully expands
Dissipate.
2) heating, rolling mill practice
450mm continuous casting steel billet uses zone heating mode: total heat time heating time is 620min, and the first bringing-up section temperature is 1125 DEG C,
Second bringing-up section temperature is 1245 DEG C, and soaking zone temperature is 1230 DEG C, the second bringing-up section and soaking zone total heat time heating time >=
300min, it is ensured that strand segregation is fully spread.
Rolling process uses " the big pressure of high temperature " technique, makes loose abundant pressing, improves internal quality of steel plate and heart portion property
Energy.Start rolling temperature is 1070 DEG C, and finishing temperature is 995 DEG C, and single pass drafts is 50mm, and 4 passages complete rolling.
Steel plate roll off the production line after stacking slow cooling >=72 hour, fully expand hydrogen.
3) Technology for Heating Processing
Using normalizing process, normalizing temperature is 900 ± 10 DEG C, and temperature retention time coefficient: 2.6min/mm is air-cooled；In order to ensure normalizing
Rear cooling effect, steel plate is individually put after rolling off the production line.
The 250mm thickness S355NL low carbon and high ductility super-thick steel plate prepared via above-mentioned manufacturing process, UT flaw detection meets NB/
T47013.3 standard I level requirement, low-temperature impact toughness and the good comprehensive mechanical performance with excellence refer to table 1.
Embodiment 3
The thickness of the S355NL steel plate of the present embodiment is 250mm, and its chemical composition is by weight percentage: C:0.12%, Si:
0.23%, Mn:1.55%, P:0.004%, S:0.0005%, Nb:0.030%, V:0.038%, Alt:0.035%, Ni:0.45%, H:
0.00008%, O:0.0012%, N:0.0028%, surplus is Fe and inevitable impurity element.
The manufacturing process of this steel plate is as follows:
450mm thickness continuous casting steel billet is used to produce, production process route: KR pretreatment → converter smelting → LF refine → RH refine →
Sheet billet continuous casting → slab slow cooling → heating of plate blank → steel plate rolling → steel plate slow cooling → flaw detection → normalizing → finishing → check → enter
Storehouse.
1) smelting process
Use 450mm continuous casting steel billet to produce, improve Molten Steel Cleanliness, reduction by reducing S, P, H, O, N element content in steel
Strand segregation, raw materials for metallurgy, through KR molten iron pretreatment, takes off Slag treatment after converter smelting, strictly control S≤0.001%, P≤
0.006%, H≤1.2ppm, O≤20ppmm, N≤40ppm；Control strand by continuous casting working procedure dynamic soft reduction technology and be segregated in C
Class less than 1.0 grades, loosens below 0.5 grade；Slab roll off the production line after covering slow cooling more than 48 hours, it is ensured that the hydrogen in steel fully expands
Dissipate.
2) heating, rolling mill practice
450mm continuous casting steel billet uses zone heating mode: total heat time heating time is 625min, and the first bringing-up section temperature is 1118 DEG C,
Second bringing-up section temperature is 1225 DEG C, and soaking zone temperature is 1235 DEG C, the second bringing-up section and soaking zone total heat time heating time >=
300min, it is ensured that strand segregation is fully spread.
Rolling process uses " the big pressure of high temperature " technique, makes loose abundant pressing, improves internal quality of steel plate and heart portion property
Energy.Start rolling temperature is 1065 DEG C, and finishing temperature is 985 DEG C, and single pass drafts is 50mm, and 4 passages complete rolling.
Steel plate roll off the production line after stacking slow cooling >=72 hour, fully expand hydrogen.
3) Technology for Heating Processing
Using normalizing process, normalizing temperature is 900 ± 10 DEG C, and temperature retention time coefficient: 2.6min/mm is air-cooled；In order to ensure normalizing
Rear cooling effect, steel plate is individually put after rolling off the production line.
The 250mm thickness S355NL low carbon and high ductility super-thick steel plate prepared via above-mentioned manufacturing process, UT flaw detection meets NB/
T47013.3 standard I level requirement, low-temperature impact toughness and the good comprehensive mechanical performance with excellence refer to table 1.
The mechanical performance of the steel plate that each embodiment of table 1 is produced
Note: be meansigma methods in ().
Claims (3)
1. a S355NL low carbon and high ductility low alloy steel plate thick for 250mm, it is characterised in that: the chemical composition of this steel plate is by weight
Amount percentages is C:0.07～0.14%, Si:0.15～0.25%, Mn:1.40～1.60%, P :≤0.006%, S :≤
0.001%, Al:0.02～0.06%, Nb:0.02～0.05%, V:0.02～0.05%, Ni:0.30～0.50%, surplus is Fe
And inevitable impurity element.
The S355NL low carbon and high ductility low alloy steel plate that 250mm the most according to claim 1 is thick, it is characterised in that: steel plate
The mechanical performance of finished product meets: yield strength >=325Mpa, tensile strength >=500Mpa, elongation after fracture >=30%, heart portion-50
DEG C impact of collision merit monodrome >=150J, thickness direction Tensile fracture shrinkage factor >=60%, steel plate UT flaw detection can meet NB/
T47013.3 I level requirement.
3. the method manufacturing S355NL low carbon and high ductility low alloy steel plate thick for 250mm as claimed in claim 1, its feature
It is:
Production process route: KR pretreatment → converter smelting → LF refine → RH refine → sheet billet continuous casting → slab slow cooling → slab
Heating → steel plate rolling → steel plate slow cooling → flaw detection → normalizing → finishing → inspection → warehouse-in；
The concrete operations of master operation are as follows,
1) smelting process
450mm continuous casting steel billet produces, and is improved Molten Steel Cleanliness by S, P, H, O, N element content in reduction steel, is reduced strand
Segregation, raw materials for metallurgy, through KR molten iron pretreatment, takes off Slag treatment after converter smelting, control S≤0.001%, P≤0.006%, H≤
1.2ppm, O≤20ppmm, N≤40ppm；By continuous casting working procedure dynamic soft reduction technology control strand be segregated in C class 1.0 grades with
Under, loosen below 0.5 grade；Slab roll off the production line after covering slow cooling more than 48 hours；
2) heating, rolling mill practice
450mm continuous casting steel billet uses zone heating mode: total heat time heating time is 550～650min, and the first bringing-up section temperature is
1050～1150 DEG C, the second bringing-up section temperature is 1200～1260 DEG C, and soaking zone temperature is 1180～1250 DEG C, the second bringing-up section
Heat time heating time total with soaking zone >=300min；
Rolling process uses " the big pressure of high temperature " technique, and start rolling temperature is 1060～1100 DEG C, and finishing temperature is 980～1020
DEG C, single pass drafts 50mm and more than, 3-4 passage completes rolling；
Steel plate roll off the production line after stacking slow cooling >=72 hour, fully expand hydrogen；
3) Technology for Heating Processing
Using normalizing process, normalizing temperature is 900 ± 10 DEG C, and temperature retention time coefficient: 2.4～2.6min/mm is air-cooled；In order to protect
Cooling effect after card normalizing, steel plate is individually put after rolling off the production line.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610460071.9A CN105925893B (en) | 2016-06-23 | 2016-06-23 | S355NL low carbon and high ductilities low alloy steel plate thick a kind of 250mm and its manufacture method |
| PCT/CN2016/102558 WO2017219549A1 (en) | 2016-06-23 | 2016-10-19 | 250 mm thick low-carbon high-toughness low-alloy s355nl steel plate, and manufacturing method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610460071.9A CN105925893B (en) | 2016-06-23 | 2016-06-23 | S355NL low carbon and high ductilities low alloy steel plate thick a kind of 250mm and its manufacture method |
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| Publication Number | Publication Date |
|---|---|
| CN105925893A true CN105925893A (en) | 2016-09-07 |
| CN105925893B CN105925893B (en) | 2017-11-03 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017219549A1 (en) * | 2016-06-23 | 2017-12-28 | 江阴兴澄特种钢铁有限公司 | 250 mm thick low-carbon high-toughness low-alloy s355nl steel plate, and manufacturing method therefor |
| CN107805755A (en) * | 2016-09-09 | 2018-03-16 | 中国石化工程建设有限公司 | A kind of low temperature thick walled steel tube and preparation method thereof |
| CN109628847A (en) * | 2019-01-03 | 2019-04-16 | 南京钢铁股份有限公司 | A kind of normalizing S355NL-Z35 super-thick steel plate and manufacturing method |
| CN110257722A (en) * | 2019-07-25 | 2019-09-20 | 南京钢铁股份有限公司 | High-intensitive S420NL-Z35 low-temperature flexibility steel plate and manufacturing method |
| CN112322992A (en) * | 2020-11-04 | 2021-02-05 | 山东钢铁集团日照有限公司 | Method for manufacturing low-alloy super-thick steel plate with excellent low-temperature toughness |
| CN113278878A (en) * | 2021-04-01 | 2021-08-20 | 江阴兴澄特种钢铁有限公司 | Hydrogen-induced cracking resistant pressure vessel steel plate with thickness of more than 200-250 mm and manufacturing method thereof |
| CN114410935A (en) * | 2021-12-30 | 2022-04-29 | 舞阳钢铁有限责任公司 | Production method of P265GH steel plate with good low-temperature impact toughness |
| CN115106493A (en) * | 2022-06-16 | 2022-09-27 | 山西太钢不锈钢股份有限公司 | Method for improving center density of S355NL steel continuous casting billet for wind power flange |
| CN115747659A (en) * | 2022-11-29 | 2023-03-07 | 湖南华菱湘潭钢铁有限公司 | Production method of large-piece-weight extra-thick continuous casting slab for wind power |
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| CN107805755A (en) * | 2016-09-09 | 2018-03-16 | 中国石化工程建设有限公司 | A kind of low temperature thick walled steel tube and preparation method thereof |
| CN109628847A (en) * | 2019-01-03 | 2019-04-16 | 南京钢铁股份有限公司 | A kind of normalizing S355NL-Z35 super-thick steel plate and manufacturing method |
| CN110257722A (en) * | 2019-07-25 | 2019-09-20 | 南京钢铁股份有限公司 | High-intensitive S420NL-Z35 low-temperature flexibility steel plate and manufacturing method |
| CN112322992A (en) * | 2020-11-04 | 2021-02-05 | 山东钢铁集团日照有限公司 | Method for manufacturing low-alloy super-thick steel plate with excellent low-temperature toughness |
| CN113278878A (en) * | 2021-04-01 | 2021-08-20 | 江阴兴澄特种钢铁有限公司 | Hydrogen-induced cracking resistant pressure vessel steel plate with thickness of more than 200-250 mm and manufacturing method thereof |
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| CN115106493A (en) * | 2022-06-16 | 2022-09-27 | 山西太钢不锈钢股份有限公司 | Method for improving center density of S355NL steel continuous casting billet for wind power flange |
| CN115106493B (en) * | 2022-06-16 | 2024-03-01 | 山西太钢不锈钢股份有限公司 | Method for improving center density of S355NL steel continuous casting blank for wind power flange |
| CN115747659A (en) * | 2022-11-29 | 2023-03-07 | 湖南华菱湘潭钢铁有限公司 | Production method of large-piece-weight extra-thick continuous casting slab for wind power |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105925893B (en) | 2017-11-03 |
| WO2017219549A1 (en) | 2017-12-28 |
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