CN105441791A - Steel plate for thick-gauge high-toughness EH36-level ocean platform and manufacturing method - Google Patents
Steel plate for thick-gauge high-toughness EH36-level ocean platform and manufacturing method Download PDFInfo
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- CN105441791A CN105441791A CN201510781569.0A CN201510781569A CN105441791A CN 105441791 A CN105441791 A CN 105441791A CN 201510781569 A CN201510781569 A CN 201510781569A CN 105441791 A CN105441791 A CN 105441791A
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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
- 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
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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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- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention discloses a steel plate for a thick-gauge high-toughness EH36-level ocean platform and a manufacturing method. The manufacturing method comprises the steps of heating of a plate blank, and rolling, cooling and heat treatment of the steel plate. A finished plate blank is composed of, by weight, 0.15%-0.18% of C, 0.30%-0.50% of Si, 1.4%-1.6% of Mn, 0-0.015% of P, 0-0.005% of S, greater than or equal to 0.020% of Alt, 0.030%-0.050% of Nb, 0.030%-0.050% of V, 0.008%-0.020% of Ti, 0.15%-0.30% of Ni, 0.0010%-0.0020% of La, and the balance Fe and impurities. The content of the Ni is low and the trace rare earth element La is added to serve as an alloying design for improving the strength and toughness of the steel plate; a normalizing heat treatment technique is adopted after controlled rolling and cooling, and accordingly the steel plate for the high-strength high-toughness thick-gauge ocean platform is obtained.
Description
Technical field
The present invention relates to a kind of hot-rolled steel plate and heat treatment technics, specifically, relate to a kind of thick-specification high-tenacity EH36 level offshore platform steel plate and manufacture method.
Background technology
At present, oceanographic engineering Plate Steel is reach performance requriements by normalizing thermal treatment or cooling controlling and rolling controlling process mostly.
China publication number CN1020ll050A application discloses a kind of 36kg level offshore platform steel and production method thereof, wherein, by the 36Kg level offshore platform steel of normalizing treatment 50 ~ 80mm thickness; China publication number CN101358320A application discloses a kind of steel for controlled rolling and controlled cooling platform and production method thereof, wherein, produces 10 ~ 60mm thickness 40Kg level offshore platform steel by cooling controlling and rolling controlling process; In the composition of setting forth in " development of 80mm thickness E H36 high-strength steel for ship structure " and technological design scheme, obtain 80mm thick EH36 level steel plate for ocean engineering by normalizing process; The 36Kg level offshore platform steel being produced 60mm thickness by normalizing process of setting forth in paper " trial-production of E36 level offshore platform steel "; Obtained the EH36 level offshore platform steel of thickness≤50mm by normalizing process in " exploitation of EH36 high-strength steel for ship structure ".
Such scheme is all by the design of Nb, V, Ti microalloying ingredient, and adopt normalizing heat treatment technique improve and ensure intensity and the toughness of steel plate, product thickness specification limits is at below 80mm.And in paper " the exploitation Composition Design of the thick EH36-Z35 steel plate of ocean platform 100mm " except adding Nb, V, Ti trace element microalloying in a large number, also added a large amount of noble metal Ni as the effective element improving 100mm Plate Steel intensity and toughness.
In the technical requirement of offshore platform steel, the most difficult realization is exactly the technical requirements of thickness 1/4 position that the impelling strength of thickness 1/2 position and intensity all require the standard that reaches to specify, especially the more difficult realization of thick steel plates between 80 ~ 100mm is greater than for thickness, so manufacturer adopts a large amount of noble metal Ni of interpolation to reach the intensity and toughness of improving thickness 1/2 position mostly, this just must improve the production cost of product.
Summary of the invention
Technical problem solved by the invention is to provide a kind of thick-specification high-tenacity EH36 level offshore platform steel plate, by adopting low Ni content, add trace rare-earth element La as the Alloying Design improving armor plate strength and toughness, obtain high-intensity high-tenacity think gauge offshore platform steel plate.
Technical scheme is as follows:
A kind of thick-specification high-tenacity EH36 level offshore platform steel plate, its chemical composition and content, according to weight percent meter, comprising: C0.15-0.18%, Si0.30-0.50%, Mn1.4-1.6%, P≤0.015%, S≤0.005%, Alt >=0.020%, Nb0.030-0.050%, V0.030-0.050%, Ti0.008-0.020%, Ni0.15-0.30, La0.0010-0.0020%, surplus is Fe and impurity.
Further, its chemical composition comprises: C0.17%, Si0.38%, Mn1.48%, P0.009%, S0.003%, Alt0.026%, Nb0.040%, V0.050%, Ti0.014%, Ni0.30%, La0.0015%.
Another technical problem solved by the invention is to provide a kind of manufacture method of thick-specification high-tenacity EH36 level offshore platform steel plate, by adopting low Ni content, add trace rare-earth element La as the Alloying Design improving armor plate strength and toughness, normalizing heat treatment technique after employing controlled rolling and controlled cooling, obtains high-intensity high-tenacity think gauge offshore platform steel plate.
Technical scheme is as follows:
A manufacture method for thick-specification high-tenacity EH36 level offshore platform steel plate, comprises the heating of slab, the rolling of steel plate, cooling and heat treatment process; Wherein, in the heat-processed of slab, the Heating temperature of slab is 1180-1210 DEG C, heat-up time >=220 minutes, soaking time >=40 minute; In the operation of rolling of steel plate, the start rolling temperature of roughing is 1160-1180 DEG C, and rough rolling step single pass draft is 14.9 ~ 20.1%; The start rolling temperature 870-920 DEG C of finish rolling, the open rolling thickness of finish rolling is the finished product thickness of 1.2 ~ 1.5 times, the single pass draft 4.9-15.3% of finish rolling, and the temperature of finish to gauge is 850-880 DEG C; Cooling adopts ACC accelerating cooling mode, and final cooling temperature is 650-700 DEG C, and speed of cooling is 5-10 DEG C/s; In heat treatment process, normalizing temperature 850-880 DEG C, soaking time 10-30 minute; Finished steel plate chemical composition and content, according to weight percent meter, comprising: C0.15-0.18%, Si0.30-0.50%, Mn1.4-1.6%, P≤0.015%, S≤0.005%, Alt >=0.020%, Nb0.030-0.050%, V0.030-0.050%, Ti0.008-0.020%, Ni0.15-0.30, La0.0010-0.0020%, surplus is Fe and impurity.
Further: be that process furnace put into by the slab of 300mm by thickness, slab tapping temperature is 1210 DEG C, and heat-up time is 240 minutes, and soaking time is 50 minutes; Roughing start rolling temperature is 1170 DEG C; Finish rolling start rolling temperature is 910 DEG C, and open rolling thickness is 120mm, finishing temperature 860 DEG C; ACC final cooling temperature is 660 DEG C, speed of cooling is 8 DEG C/s; Normalizing temperature is 880 DEG C, and soaking time is 20min; The thickness of finished steel plate is 80mm.
Further: be that process furnace put into by the slab of 300mm by thickness, slab tapping temperature is 1210 DEG C, 240 minutes heat-up times, and soaking time is 50 minutes; Roughing start rolling temperature is 1170 DEG C; Finish rolling start rolling temperature is 910 DEG C, and open rolling thickness is 140mm, and finishing temperature is 870 DEG C; ACC final cooling temperature is 660 DEG C, and cold ground speed is 5 DEG C/s; Normalizing temperature 860 DEG C, soaking time 30min; The thickness of finished steel plate is 100mm.
Compared with prior art, the technology of the present invention effect comprises:
1, the EH36 level thickness that the technology of the present invention is produced is greater than the offshore platform steel plate of 80 ~ 100mm, by adopting low Ni content, add trace rare-earth element La as the Alloying Design improving armor plate strength and toughness, normalizing heat treatment technique after employing controlled rolling and controlled cooling, obtain high-intensity high-tenacity think gauge offshore platform steel plate, its technical indicator reaches yield strength >=355MPa, tensile strength >=510MPa, and thickness 1/2 position impact of collision merit is greater than 150J under-40 DEG C of conditions, anti-lamellar tearing performance reaches more than 45%.
2, production technique of the present invention not only saves production cost, and the carbon equivalent of material is low, welding Sensitivity Index is low, and rare earth La microalloying, intensity surplus is moderate, and unit elongation, impelling strength surplus are large.
Embodiment
Below with reference to example embodiment, technical solution of the present invention is elaborated.But example embodiment can be implemented in a variety of forms, and should not be understood to be limited to embodiment set forth herein; On the contrary, provide these embodiments to make the present invention more comprehensively with complete, and the design of example embodiment is conveyed to those skilled in the art all sidedly.
A manufacture method for thick-specification high-tenacity EH36 level offshore platform steel plate, comprising: the heating of slab, the rolling of steel plate, cooling, thermal treatment.
Step 1: the heating of slab;
Slab heating temperature is 1180-1210 DEG C, heat-up time >=220 minutes, soaking time >=40 minute.
Step 2: the rolling of steel plate;
Rolling comprises roughing and finish rolling; The start rolling temperature of roughing is 1160-1180 DEG C, and rough rolling step single pass draft is 14.9 ~ 20.1%; The start rolling temperature 870-920 DEG C of finish rolling, the open rolling thickness of finish rolling is the finished product thickness of 1.2 ~ 1.5 times, finish rolling stage single pass draft 4.9-15.3%, and the temperature of finish to gauge is 850-880 DEG C.
Process characteristic is that low-temperature heat, low temperature rolling, finish rolling open rolling thickness are little, to ensure that austenitic area controlled rolling obtains the austenite crystal of fine uniform.
Step 3: the cooling of steel plate;
Adopt ACC (accelerating cooling) mode, final cooling temperature is 650-700 DEG C, and speed of cooling is 5-10 DEG C/s.
In the present invention, ACC final cooling temperature is high, rate of cooling is little, to prevent Widmannstatten structure, reduces the comprehensive mechanical performance of steel.
Step 4: the heat treatment process of steel plate.
Normalizing temperature 850-880 DEG C, soaking time 10-30 minute.
Thermal treatment process adopts low-temperature heat equally, to obtain tiny tissue, ensures the favorable comprehensive mechanical property of high-strength and high-ductility.
The thick-specification high-tenacity EH36 level offshore platform steel plate of finished product, its chemical composition and content (weight percent) should meet: C0.15-0.18%, Si0.30-0.50%, Mn1.4-1.6%, P≤0.015%, S≤0.005%, Alt (Holo-Al content in steel) >=0.020%, Nb0.030-0.050%, V0.030-0.050%, Ti0.008-0.020%, Ni0.15-0.30, La0.0010-0.0020%, surplus is Fe and inevitable impurity.
Example 1
Thickness is that process furnace put into by the slab of 300mm, and slab tapping temperature is 1210 DEG C, and 240 minutes heat-up times, soaking time is 50 minutes; Roughing start rolling temperature is 1170 DEG C, finish rolling start rolling temperature 910 DEG C, open rolling thickness 120mm, finishing temperature 860 DEG C, ACC final cooling temperature 660 DEG C, speed of cooling 8 DEG C/s, normalizing temperature 880 DEG C, soaking time 20min.(weight percent) chemical composition of finished product slab is: C0.17%, Si0.38%, Mn1.48%, P0.009%, S0.003%, Alt0.026%, Nb0.040%, V0.050%, Ti0.014%, Ni0.30%, La0.0015%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 80mm, detailed rolling and thermal treatment process are in table 1, and its mechanical property is in table 2.
Table 1 rolling and thermal treatment process
The mechanical property of table 2 steel plate
Embodiment 2
Process furnace put into by the slab being 300mm by the thickness intending rolling, slab tapping temperature is 1210 DEG C, 240 minutes heat-up times, soaking time is 50 minutes, roughing start rolling temperature is 1170 DEG C, finish rolling start rolling temperature is 910 DEG C, open rolling thickness is 140mm, finishing temperature is 870 DEG C, and final cooling temperature is 660 DEG C, speed of cooling is 5 DEG C/s, normalizing temperature 860 DEG C, soaking time 30min.(weight percent) chemical composition of finished product slab is: C0.17%, Si0.38%, Mn1.48%, P0.009%, S0.003%, Alt0.026%, Nb0.040%, V0.050%, Ti0.014%, Ni0.30%, La0.0015%, surplus is Fe and inevitable impurity.Be rolled into the steel plate that thickness is 100mm, detailed rolling and thermal treatment process are in table 3, and its mechanical property is in table 4.
Table 3 rolling and thermal treatment process
The mechanical property of table 4 steel plate
Although describe the present invention with reference to several representative instance, should be appreciated that term used illustrates and exemplary and nonrestrictive term.Spirit or the essence of invention is not departed from because the present invention can specifically implement in a variety of forms, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and explain widely in the spirit and scope that should limit in claim of enclosing, therefore fall into whole change in claim or its equivalent scope and remodeling and all should be claim of enclosing and contained.
Claims (5)
1. a thick-specification high-tenacity EH36 level offshore platform steel plate, is characterized in that, its chemical composition and content are according to weight percent meter, comprise: C0.15-0.18%, Si0.30-0.50%, Mn1.4-1.6%, P≤0.015%, S≤0.005%, Alt >=0.020%, Nb0.030-0.050%, V0.030-0.050%, Ti0.008-0.020%, Ni0.15-0.30, La0.0010-0.0020%, surplus is Fe and impurity.
2. thick-specification high-tenacity EH36 level offshore platform steel plate as claimed in claim 1, it is characterized in that, its chemical composition comprises: C0.17%, Si0.38%, Mn1.48%, P0.009%, S0.003%, Alt0.026%, Nb0.040%, V0.050%, Ti0.014%, Ni0.30%, La0.0015%.
3. a manufacture method for thick-specification high-tenacity EH36 level offshore platform steel plate, is characterized in that: comprise the heating of slab, the rolling of steel plate, cooling and heat treatment process; Wherein, in the heat-processed of slab, the Heating temperature of slab is 1180-1210 DEG C, heat-up time >=220 minutes, soaking time >=40 minute; In the operation of rolling of steel plate, the start rolling temperature of roughing is 1160-1180 DEG C, and rough rolling step single pass draft is 14.9 ~ 20.1%; The start rolling temperature 870-920 DEG C of finish rolling, the open rolling thickness of finish rolling is the finished product thickness of 1.2 ~ 1.5 times, the single pass draft 4.9-15.3% of finish rolling, and the temperature of finish to gauge is 850-880 DEG C; Cooling adopts accelerating cooling mode, and final cooling temperature is 650-700 DEG C, and speed of cooling is 5-10 DEG C/s; In heat treatment process, normalizing temperature 850-880 DEG C, soaking time 10-30 minute; Finished steel plate chemical composition and content, according to weight percent meter, comprising: C0.15-0.18%, Si0.30-0.50%, Mn1.4-1.6%, P≤0.015%, S≤0.005%, Alt >=0.020%, Nb0.030-0.050%, V0.030-0.050%, Ti0.008-0.020%, Ni0.15-0.30, La0.0010-0.0020%, surplus is Fe and impurity.
4. the manufacture method of thick-specification high-tenacity EH36 level offshore platform steel plate as claimed in claim 1, is characterized in that: be that process furnace put into by the slab of 300mm by thickness, slab tapping temperature is 1210 DEG C, and heat-up time is 240 minutes, and soaking time is 50 minutes; Roughing start rolling temperature is 1170 DEG C; Finish rolling start rolling temperature is 910 DEG C, and open rolling thickness is 120mm, finishing temperature 860 DEG C; ACC final cooling temperature is 660 DEG C, and speed of cooling is 8 DEG C/s; Normalizing temperature is 880 DEG C, and soaking time is 20min; The thickness of finished steel plate is 80mm.
5. the manufacture method of thick-specification high-tenacity EH36 level offshore platform steel plate as claimed in claim 1, is characterized in that: be that process furnace put into by the slab of 300mm by thickness, slab tapping temperature is 1210 DEG C, 240 minutes heat-up times, and soaking time is 50 minutes; Roughing start rolling temperature is 1170 DEG C; Finish rolling start rolling temperature is 910 DEG C, and open rolling thickness is 140mm, and finishing temperature is 870 DEG C; Final cooling temperature is 660 DEG C, and speed of cooling is 5 DEG C/s; Normalizing temperature 860 DEG C, soaking time 30min; The thickness of finished steel plate is 100mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510781569.0A CN105441791B (en) | 2015-11-12 | 2015-11-12 | A kind of manufacturing method of thick-specification high-tenacity EH36 grades of offshore platform steel plates |
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| CN201510781569.0A CN105441791B (en) | 2015-11-12 | 2015-11-12 | A kind of manufacturing method of thick-specification high-tenacity EH36 grades of offshore platform steel plates |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108330407A (en) * | 2018-01-19 | 2018-07-27 | 山东钢铁集团日照有限公司 | A kind of low-carbon TMCP technique EH36 decks of boat and its production method |
| CN111088417A (en) * | 2020-01-07 | 2020-05-01 | 钢铁研究总院 | Ceq and Pcm high heat input welding normalizing EH36 extra-thick plate and manufacturing 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 |
| CN113373368A (en) * | 2021-05-26 | 2021-09-10 | 北京科技大学 | Preparation method of lanthanum or cerium doped ship plate steel with strong seawater corrosion resistance |
| CN116043105A (en) * | 2022-11-07 | 2023-05-02 | 内蒙古工业大学 | Corrosion-resistant ultra-high-strength steel for ocean platform and preparation method thereof |
-
2015
- 2015-11-12 CN CN201510781569.0A patent/CN105441791B/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 杨春卫等: "《高强度船体及海洋工程用钢EH36-Z35的开发》", 《2012年全国轧钢生产技术会议论文集（下）》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108330407A (en) * | 2018-01-19 | 2018-07-27 | 山东钢铁集团日照有限公司 | A kind of low-carbon TMCP technique EH36 decks of boat and its production method |
| CN111088417A (en) * | 2020-01-07 | 2020-05-01 | 钢铁研究总院 | Ceq and Pcm high heat input welding normalizing EH36 extra-thick plate and manufacturing method thereof |
| CN111088417B (en) * | 2020-01-07 | 2021-01-05 | 钢铁研究总院 | Ceq and Pcm high heat input welding normalizing EH36 extra-thick plate and manufacturing 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 |
| CN113373368A (en) * | 2021-05-26 | 2021-09-10 | 北京科技大学 | Preparation method of lanthanum or cerium doped ship plate steel with strong seawater corrosion resistance |
| CN113373368B (en) * | 2021-05-26 | 2022-03-04 | 北京科技大学 | Preparation method of lanthanum or cerium doped ship plate steel with strong seawater corrosion resistance |
| CN116043105A (en) * | 2022-11-07 | 2023-05-02 | 内蒙古工业大学 | Corrosion-resistant ultra-high-strength steel for ocean platform and preparation method thereof |
| CN116043105B (en) * | 2022-11-07 | 2024-04-12 | 内蒙古工业大学 | Corrosion-resistant ultra-high-strength steel for ocean platform and preparation method thereof |
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