CN105779865A - Thin gauge steel plate used for marine engineering and preparation method thereof - Google Patents
Thin gauge steel plate used for marine engineering and preparation method thereof Download PDFInfo
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- CN105779865A CN105779865A CN201610367658.5A CN201610367658A CN105779865A CN 105779865 A CN105779865 A CN 105779865A CN 201610367658 A CN201610367658 A CN 201610367658A CN 105779865 A CN105779865 A CN 105779865A
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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
-
- 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
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention belongs to the technical field of structural steel used for ship and marine engineering and particularly relates to a thin gauge steel plate used for marine engineering and a preparation method thereof. The thickness gauge of the steel plate is 6-12 mm. The steel plate is prepared from, by mass, 0.09-0.15% of C, 0.10-0.40% of Si, 1.20-1.60% of Mn, 0.015% or less of P, 0.005% or less of S, 0.015-0.055% of Als, 0.010-0.035% of Nb, 0.010-0.035% of V, 0.005-0.02% of Ti, 0.43% or less of Ce, 0.23% or less of Pcm and the balance Fe and unavoidable impurities. The Nb+V+Ti microalloying elements, a thick continuous casting slab of 250 mm and a controlled rolling technology are adopted for producing the 355MPa grade steel plate used for marine engineering, a traditional normalizing technology is omitted, the production period is shortened, the production cost is lowered, and mechanical properties are stable.
Description
Technical field
The invention belongs to boats and ships and ocean engineering structural steel technical field, use particularly to a kind of Thin Specs ocean engineering
Steel plate and preparation method thereof.
Background technology
Domestic shipbuilding and marine engineering equipment development of manufacturing are rapid, accomplished shipbuilding, the newly amount of receiving orders, hand-held order volume
All positions are at the forefront in the world for many years.Along with the development of marine resources development, marine engineering equipment manufacturing industry is to ocean platform
Have an optimistic view of by the demand prospect of steel.
The all technical of offshore platform steel plate requires high, must have high intensity, high tenacity, resisting fatigue, anti-layer
The performance such as shape tear, good weldability, seawater corrosion resistance and good cold-workability.Oneself warp of domestic offshore platform steel plate is wide
General employing, mainly includes the trades mark such as AH36, DH36, EH36, DH36-Z35, EH36-Z35.
Ocean platform is the Code in Hazardous Special Locations at sea carrying out operation, and the ocean platform military service phase is higher by 50% than boats and ships class, it is desirable to sea
Ocean Platform Steel plate has stable mechanical property, and its condition of delivery is based on normalizing process.But it is non-for ocean platform top
Key position, can use controlled rolling state thin specification steel plate the most completely.
Summary of the invention
The invention provides a kind of Thin Specs steel plate for ocean engineering and preparation method thereof, use Nb+V+Ti microalloying
Element, 250mm thickness continuous casting billet, controlled rolling process produce 355MPa level steel plate for ocean engineering, eliminate traditional normalizing process, contracting
The short production cycle, reduce production cost, stable mechanical property.
The present invention is achieved by the following technical solutions: a kind of Thin Specs steel plate for ocean engineering, its thickness specification is
6-12mm, steel plate chemical composition mass percent is: C 0.09-0.15%, Si 0.10-0.40%, Mn 1.20-1.60%, P≤
0.015%, S≤0.005%, Als 0.015-0.055%, Nb 0.010-0.035%, V 0.010-0.035%, Ti 0.005-
0.020%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity.
In steel plate of the present invention, the mechanism of action of each alloying component is as follows:
Carbon: C is the intensified element that ferrous materials is traditional, economic, of great impact to the intensity of steel, toughness, plasticity, welding etc..
With the increase of carbon content, intensity improves, and impact flexibility is then decreased obviously, and has a negative impact welding performance.Due to sea
Ceq and Pcm is all required by ocean Platform Steel plate, and C content can not be too high, and preferably C content controls at 0.09-0.15%.
Silicon: Si is the main deoxidant element of steel-making, for reach sufficient deoxidation effect Si content should more than 0.05%, but
If too high, the toughness of mother metal and welding position can be reduced.Therefore preferably Si content is 0.10-0.40%.
Manganese: Mn is to ensure that the intensity of steel and the essential elements of toughness, is also good deoxidizer, but the too high meeting of Fe content is made
Become that Banded Structure of Steel Plate is serious, toughness reduces and the problem such as anisotropy, and the welding performance of steel plate is had a negative impact.Cause
This preferred Mn content is 1.2-1.60%.
Phosphorus: P is the harmful element causing the more serious segregation of steel, the fragility of increase steel, and especially black brittleness is tough to impact
Property brings adverse effect, and the P content of the present invention controls below 0.015%.
Sulfur: S is to remain in one of harmful element in steel, can increase the red brittleness of steel, reduces ductility and the toughness of steel,
Welding is also adversely affected.The S content of the present invention controls below 0.005%.
Aluminum: Al is a kind of strong deoxidizer, and can refine the crystal grain of steel, improves steel toughness at low temperatures, but exceedes
Easily producing blank hot crackle when 0.08%, the toughness of steel reduces simultaneously.Therefore preferably Al content is 0.015-0.055%.
Niobium: Nb and carbon, nitrogen, oxygen have extremely strong affinity, form the compound of corresponding stabilizer pole therewith.Nb can refine
The crystal grain of steel, reduces the superheated susceptivity of steel and temper brittleness, under certain existence condition, can improve the intensity of steel and tough
Property.The Nb content of the present invention controls at 0.010-0.035%.
Vanadium: V can refine the crystal grain of steel, improves the intensity of steel, yield tensile ratio and low-temperature flexibility, improves the welding performance of steel, also
The heat resistance of steel and the drag of creep can be increased.But content of vanadium is unsuitable too high, too high, reduces the toughness of steel, is unfavorable for the compacted of steel
Degeneration energy.The V content of the present invention controls at 0.010-0.035%.
Titanium: Ti can not only improve the intensity of steel, crystal grain thinning, reduction aging sensitivity and cold brittleness, and a small amount of titanium
Can also improving welding property.Ti plays a role so that TiN form exists, and during less than 0.005%, effect is little, easy shape during more than 0.04%
Bulky grain TiN is become to lose effect.Therefore preferably Ti content is 0.005-0.020%.
The technological process of production of steel plate of the present invention is:
Blast-melted → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refine → RH refine → sheet billet continuous casting → plate
Base roll off the production line stacking slow cooling → slab cleaning → slab reheat → 4300 milling train controlled rollings → steel plate air cooling → finished product pick test →
Warehouse-in.
Its manufacturing condition is:
Molten iron P≤0.10%, As≤0.006%, molten iron takes off after S skims, and molten iron bare area is more than 2/3, S≤0.005%；
The tapping time is not less than 4.5 minutes, and CAS station argon blowing time >=12 min(is containing tapping Argon)；
Molten steel, after LF refine, carries out RH application of vacuum, vacuum≤100Pa, vacuum processing time >=15min；
Molten steel casting becomes 250mm heavy slab, and roll off the production line stacking slow cooling, and strand low power reaches center segregation C class 1.5, center porosity
0.5；
Slab inspection cleaning after shove charge heating, heat time heating time 9-10min/cm, temperature 1020-1100 DEG C after dephosphorization；
Roughing start rolling temperature 1020-1120 DEG C, at least 1 reduction in pass >=30mm, workpiece thickness >=2 times finished steel plate
Thickness；
Finish rolling start rolling temperature 870 DEG C ± 20 DEG C, finishing temperature control is at 850 ± 20 DEG C；
Roll rear steel plate air cooling to room temperature.
The invention have the benefit that the thickness specification that can produce steel plate is 6-12mm, use Nb+V+Ti microalloying unit
Element, 250mm thickness continuous casting billet, controlled rolling process produce 355MPa level steel plate for ocean engineering, eliminate traditional normalizing process, shorten
Production cycle, reduce production cost, it is possible to ensure stable mechanical property: lower yield strength 365-440MPa, tension is strong
Degree 500-580MPa, elongation after fracture 25-35%, at-20 DEG C, Charpy V-type side knock merit is averagely at more than 160J.
Detailed description of the invention
Below in conjunction with specific embodiment further describe the present invention, advantages of the present invention and feature will be with describe and
Apparent.But embodiment is only exemplary, the scope of the present invention is not constituted any restriction.Those skilled in the art should
It should be appreciated that, the details of technical solution of the present invention and form can be repaiied lower without departing from the spirit and scope of the present invention
Change or replace, but these amendments and replacement each fall within protection scope of the present invention.
1 one kinds of Thin Specs steel plate for ocean engineerings of embodiment and preparation method thereof
According to the process conditions of chemical composition, technological process and regulation that the present invention provides, smelting steel in 210 tons of converters
Water, becomes 250mm heavy slab by molten steel casting, rolls 6mm steel plate on 4300mm wide and heavy plate mill.Its technological process of production is:
Blast-melted → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refine → RH refine → sheet billet continuous casting → plate
Base roll off the production line stacking slow cooling → slab cleaning → slab reheat → 4300 milling train controlled rollings → steel plate air cooling → finished product pick test →
Warehouse-in.
Actual conditions is as follows:
Molten iron P=0.09%, As=0.005%, molten iron takes off after S skims, and molten iron bare area is more than 2/3, S=0.004%；
5 minutes tapping time, CAS station argon blowing time 13 min(is containing tapping Argon)；
Molten steel, after LF refine, carries out RH application of vacuum, vacuum 90Pa, vacuum processing time 15min；
Molten steel casting becomes 250mm heavy slab, and roll off the production line stacking slow cooling, strand low power center segregation C class 1.5, center porosity 0.5；
Slab inspection cleaning after shove charge heating, heat time heating time 235min, temperature 1050 DEG C after dephosphorization；
Roughing start rolling temperature 1070 DEG C, 2 reduction in pass >=30mm, workpiece thickness 30mm；
Finish rolling start rolling temperature 880 DEG C, finishing temperature 860 DEG C；
Roll rear steel plate air cooling to room temperature.
The chemical composition of steel plate is: C 0.12%, Si 0.21%, Mn 1.41%, P 0.013%, S 0.004%, Als
0.030%, Nb 0.019%, V 0.020%, Ti 0.015%, Ceq 0.36%, Pcm 0.20%.
The behavior pattern of steel plate is shown in Table 1.
The behavior pattern of table 1 steel plate
2 one kinds of Thin Specs steel plate for ocean engineerings of embodiment and preparation method thereof
According to the process conditions of chemical composition, technological process and regulation that the present invention provides, smelting steel in 210 tons of converters
Water, becomes 250mm heavy slab by molten steel casting, rolls 12mm steel plate on 4300mm wide and heavy plate mill.Its technological process of production is:
Blast-melted → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refine → RH refine → sheet billet continuous casting → plate
Base roll off the production line stacking slow cooling → slab cleaning → slab reheat → 4300 milling train controlled rollings → steel plate air cooling → finished product pick test →
Warehouse-in.
Actual conditions is as follows:
Molten iron P=0.09%, As=0.005%, molten iron takes off after S skims, and molten iron bare area is more than 2/3, S=0.004%；
5 minutes tapping time, CAS station argon blowing time 13 min(is containing tapping Argon)；
Molten steel, after LF refine, carries out RH application of vacuum, vacuum 90Pa, vacuum processing time 15min；
Molten steel casting becomes 250mm heavy slab, and roll off the production line stacking slow cooling, strand low power center segregation C class 1.5, center porosity 0.5；
Slab inspection cleaning after shove charge heating, heat time heating time 240min, temperature 1060 DEG C after dephosphorization；
Roughing start rolling temperature 1080 DEG C, 2 reduction in pass >=30mm, workpiece thickness 50mm；
Finish rolling start rolling temperature 875 DEG C, finishing temperature 860 DEG C；
Roll rear steel plate air cooling to room temperature.
The chemical composition of steel plate is: C 0.12%, Si 0.21%, Mn 1.41%, P 0.013%, S 0.004%, Als
0.030%, Nb 0.019%, V 0.020%, Ti 0.015%, Ceq 0.36%, Pcm 0.20%.
The behavior pattern of steel plate is shown in Table 2.
The behavior pattern of table 2 steel plate
Claims (8)
1. a Thin Specs steel plate for ocean engineering, it is characterised in that the thickness specification of Thin Specs steel plate for ocean engineering is 6-
12mm, steel plate chemical composition mass percent is: C 0.09-0.15%, Si 0.10-0.40%, Mn 1.20-1.60%, P≤
0.015%, S≤0.005%, Als 0.015-0.055%, Nb 0.010-0.035%, V 0.010-0.035%, Ti 0.005-
0.020%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity.
2. the production technology of Thin Specs steel plate for ocean engineering as claimed in claim 1, step is as follows: blast-melted → molten iron is pre-
Desulfurization → converter smelting → deoxidation alloying → LF refine → RH refine → sheet billet continuous casting → slab rolls off the production line stacking slow cooling → slab
Cleaning → slab reheats → 4300 milling train controlled rollings → steel plate air cooling → finished product pick test → warehouse-in.
Production technology the most according to claim 2, it is characterised in that described blast-melted middle P≤0.10%, As≤
0.006%, molten iron takes off after S skims, and molten iron bare area is more than 2/3, S≤0.005%；
The tapping time is not less than 4.5 minutes, and CAS stands argon blowing time >=12 min；
Molten steel, after LF refine, carries out RH application of vacuum, vacuum≤100Pa, vacuum processing time >=15min.
Production technology the most according to claim 2, it is characterised in that molten steel casting becomes 250mm heavy slab, roll off the production line stacking
Slow cooling, strand low power reaches center segregation C class 1.5, center porosity 0.5；
Slab inspection cleaning after shove charge heating, heat time heating time 9-10min/cm, temperature 1020-1100 DEG C after dephosphorization；
Roughing start rolling temperature 1020-1120 DEG C, at least 1 reduction in pass >=30mm, workpiece thickness >=2 times finished steel plate
Thickness；
Finish rolling start rolling temperature 870 DEG C ± 20 DEG C, finishing temperature control is at 850 ± 20 DEG C；
Roll rear steel plate air cooling to room temperature.
Thin Specs steel plate for ocean engineering the most according to claim 1, it is characterised in that Thin Specs steel plate for ocean engineering
Thickness specification be 6mm, the chemical composition of steel plate is: C 0.12%, Si 0.21%, Mn 1.41%, P 0.013%, S 0.004%,
Als 0.030%, Nb 0.019%, V 0.020%, Ti 0.015%, Ceq 0.36%, Pcm 0.20%.
6. preparing the production technology of Thin Specs steel plate for ocean engineering as claimed in claim 5, step is as follows:
Blast-melted → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refine → RH refine → sheet billet continuous casting → plate
Base roll off the production line stacking slow cooling → slab cleaning → slab reheat → 4300 milling train controlled rollings → steel plate air cooling → finished product pick test →
Warehouse-in；
Actual conditions is as follows:
Molten iron P=0.09%, As=0.005%, molten iron takes off after S skims, and molten iron bare area is more than 2/3, S=0.004%；
5 minutes tapping time, CAS station argon blowing time 13 min(is containing tapping Argon)；
Molten steel, after LF refine, carries out RH application of vacuum, vacuum 90Pa, vacuum processing time 15min；
Molten steel casting becomes 250mm heavy slab, and roll off the production line stacking slow cooling, strand low power center segregation C class 1.5, center porosity 0.5；
Slab inspection cleaning after shove charge heating, heat time heating time 235min, temperature 1050 DEG C after dephosphorization；
Roughing start rolling temperature 1070 DEG C, 2 reduction in pass >=30mm, workpiece thickness 30mm；
Finish rolling start rolling temperature 880 DEG C, finishing temperature 860 DEG C；
Roll rear steel plate air cooling to room temperature.
Thin Specs steel plate for ocean engineering the most according to claim 1, it is characterised in that Thin Specs steel plate for ocean engineering
Thickness specification be 12mm, the chemical composition of steel plate is: C 0.12%, Si 0.21%, Mn 1.41%, P 0.013%, S
0.004%, Als 0.030%, Nb 0.019%, V 0.020%, Ti 0.015%, Ceq 0.36%, Pcm 0.20%.
8. preparing the production technology of Thin Specs steel plate for ocean engineering as claimed in claim 7, step is as follows:
Blast-melted → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refine → RH refine → sheet billet continuous casting → plate
Base roll off the production line stacking slow cooling → slab cleaning → slab reheat → 4300 milling train controlled rollings → steel plate air cooling → finished product pick test →
Warehouse-in；
Actual conditions is as follows:
Molten iron P=0.09%, As=0.005%, molten iron takes off after S skims, and molten iron bare area is more than 2/3, S=0.004%；
5 minutes tapping time, CAS station argon blowing time 13 min(is containing tapping Argon)；
Molten steel, after LF refine, carries out RH application of vacuum, vacuum 90Pa, vacuum processing time 15min；
Molten steel casting becomes 250mm heavy slab, and roll off the production line stacking slow cooling, strand low power center segregation C class 1.5, center porosity 0.5；
Slab inspection cleaning after shove charge heating, heat time heating time 240min, temperature 1060 DEG C after dephosphorization；
Roughing start rolling temperature 1080 DEG C, 2 reduction in pass >=30mm, workpiece thickness 50mm；
Finish rolling start rolling temperature 875 DEG C, finishing temperature 860 DEG C；
Roll rear steel plate air cooling to room temperature.
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Cited By (8)
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| CN106191659A (en) * | 2016-08-19 | 2016-12-07 | 山东钢铁股份有限公司 | A kind of can the steel plate for ocean engineering of Large Heat Input Welding and manufacture method thereof |
| CN107974615A (en) * | 2017-11-28 | 2018-05-01 | 天津中德应用技术大学 | Thickness is less than the Q460E high strength steel plates and its production method of 12mm |
| CN108914008A (en) * | 2018-08-10 | 2018-11-30 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of economical high-ductility 360MPa level structure steel plate and its manufacturing method |
| CN111926137A (en) * | 2020-08-12 | 2020-11-13 | 宝武集团鄂城钢铁有限公司 | Preparation method for producing ship plate by adopting high-phosphorus, high-arsenic and high-sulfur molten iron |
| CN112458375A (en) * | 2020-12-08 | 2021-03-09 | 本钢板材股份有限公司 | Special steel for ASTM A656 Gr70 support pipe and preparation method thereof |
| CN112899563A (en) * | 2021-01-15 | 2021-06-04 | 山东钢铁集团日照有限公司 | High-strength and high-toughness EH36 ship board marine steel plate and production method thereof |
| CN114807761A (en) * | 2022-04-28 | 2022-07-29 | 鞍钢股份有限公司 | EH36 grade ocean engineering steel with high ductility and manufacturing method thereof |
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| CN111926137A (en) * | 2020-08-12 | 2020-11-13 | 宝武集团鄂城钢铁有限公司 | Preparation method for producing ship plate by adopting high-phosphorus, high-arsenic and high-sulfur molten iron |
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| CN114807761B (en) * | 2022-04-28 | 2023-08-18 | 鞍钢股份有限公司 | EH36 grade marine engineering steel having high ductility and method for manufacturing same |
| CN115011862A (en) * | 2022-06-21 | 2022-09-06 | 湖南华菱湘潭钢铁有限公司 | Production method of AH36 structural steel plate for strip plate |
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