CN103074477A - Heat treatment method for steel plate used for extremely thick non-quenched and tempered ocean engineering - Google Patents
Heat treatment method for steel plate used for extremely thick non-quenched and tempered ocean engineering Download PDFInfo
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Abstract
The invention provides a heat treatment method for a steel plate used for extremely thick non-quenched and tempered ocean engineering. Two times of normalizing and tempering process are adopted, in the first normalizing: in the first stage, the temperature ranges from 600 to 650 DEG C, the temperature increment coefficient is 1.3 to 1.6 min/mm, warm is kept for 20 to 30 min, in the second stage, the temperature ranges from 890 to 950 DEG C, the temperature increment coefficient is 1.2 to 1.5 min/mm, and the warm is kept for 20 to 30 min; in the second normalizing: in the first stage, the temperature ranges from 600 to 650 DEG C, the temperature increment coefficient is 1.3 to 1.6 min/mm, the warm is kept for 20 to 30 min, in the second stage, the temperature ranges 880 to 930 DEG C, the temperature increment coefficient is 1.2 to 1.3 min/mm, and the warm is kept for 20 to 30 min; and in the tempering: the temperature ranges from 550 to 640 DEG C, the total tempering time ranges from 2.0 to 2.5 min/mm. The steel plate used for extremely thick non-quenched and tempered ocean engineering has the characteristics of high strength, high plasticity, excellent Z-direction lamellar tearing resisting performance, uniform thickness directionality and the like.
Description
Technical field
The present invention relates to a kind of Heat Treatment Of Steel method, specifically a kind of heat treating method of special thick non-hardening attitude steel plate for ocean engineering.
Background technology
Since 2012, iron and steel enterprise has entered the coldest season.Announce steel industry index of correlation demonstration in September according to Committee of Development and Reform website, September, key enterprise lost 23.8 hundred million yuan, and Jan-Sept, accumulated deficit 55.3 hundred million, compared with the same period of last year lost by being full of to turn.Seriously superfluous in this production capacity, in the situation that market in general demand does not have to take a turn for the better, steel products production structure contradiction will be more outstanding, even threaten the existence of enterprise.
Under other industry iron and steel consumption was tending towards saturated situation, in recent years, the demand of Marine Engineering Steel was increasing.76 platforms and 6 FPSOs have been built in the Eleventh Five-Year Plan period China's exploitation.China supports business research exploitation deep water semi-submersible drilling platform and the marine engineering equipments such as production platform, novel self-lifting type drilling unit, Floating Production storage handler, oceanographic engineering workboat and heavy die block, comprehensive integrated chunk during " 12 ".Oceanographic engineering consumption total amount will reach about 3,000,000 tons during " 12 ".Increasing iron and steel enterprise begins to put forth effort to research and develop Marine Engineering Steel.
Because ocean platform is on active service the time of length 50% than boats and ships, and be applied in the severe ocean Working environment such as wave, tide, storm and cold floating ice, therefore must possess the high-strength and high ductility performance, heart section performance must be good.
At present, for most domestic steel mill, continuous casting billet quality does not obviously improve, and the mill milling ability is relatively poor, compresses the smaller factors restriction that waits, and it is very large to develop high-quality special thick Marine Engineering Steel difficulty.
Summary of the invention
Technical problem to be solved by this invention is:
⑴ how the crystal grain of refinement steel, improves simultaneously intensity and toughness;
⑵ how alleviate or eliminate the defective such as banded structure, improves the whole impact property of steel plate;
⑶ how make organizing of steel more uniform and stable, improves low temperature impact properties.
The present invention proposes following technical scheme in order to solve above-mentioned skill technical problem:
A kind of heat treating method of special thick non-hardening attitude steel plate for ocean engineering, the thickness of steel are 50-100mm; Adopt double normalizing+tempering process, for the first time normalizing process: zone heating insulation, first paragraph 600-650 ℃ heating, the intensification coefficient is 1.3-1.6min/mm, is incubated 20-30min, second segment 890-950 ℃ heating after temperature, the intensification coefficient is 1.2-1.5min/mm, is incubated 20-30min after temperature; Normalizing process for the second time: the zone heating insulation, first paragraph 600-650 ℃ heating, the intensification coefficient is 1.3-1.6min/mm, insulation 20-30min after the temperature, second segment 880-930 ℃ heating, the intensification coefficient is 1.2-1.5min/mm, insulation 20-30min after the temperature; Tempering process is: tempering temperature 550-640 ℃, total tempering time is 2.0-2.5 min/mm.
Like this, the present invention adopts double normalizing+tempering process, and normalizing temperature is greater than or equal to for the second time normalizing temperature for the first time, the defective such as banded structure alleviates obviously behind the double normalizing, structure refinement is even, normalizing temperature is higher than for the second time normalizing temperature for the first time, makes for the second time normalizing not destroy the effect of for the first time normalizing, makes tissue thinning effect more obvious.Tempering after the normalizing is organized more uniform and stablely, makes low temperature impact properties good.Zone heating is taked in normalizing, first paragraph is incubated below the Ac1 temperature spot, surface temperature and heart section temperature were reached unanimity before entering austenite region, the temperature of surface and heart section is poor when reducing soak, the thickness direction fine microstructures is even, thereby surface to heart section performance is reached unanimity.
Beneficial effect of the present invention:
⑴ the present invention develops a kind of heat treating method of special thick non-hardening attitude steel plate for ocean engineering, do not have the limited steel mills of factors such as obviously improvement, the mill milling ability is relatively poor, compression is smaller mainly for continuous casting billet quality, general plate mill all can be produced.Therefore, suitability is wide, is fit to the most domestic Heavy Plate Plant and produces.
⑵ the method for zone heating insulation is taked in normalizing, can effectively shorten the soaking time of high temperature section, makes grain refinement effect more obvious, and the grain fineness number of organizing of thickness direction is reached unanimity.
⑶ adopt double normalizing, and for the first time normalizing temperature is more raised to two effects: 1. crystal grain thinning, improve intensity and toughness simultaneously; 2. alleviate or eliminate the defective such as banded structure, improve the whole impact property of steel plate.
⑷ tempering after the normalizing: organize more uniform and stablely, low temperature impact properties further improves.
⑸ manufacture method of the present invention, stable processing technique, mechanical property is good, and specific performance can see the transverse cold bending performance of embodiments of the invention and cross directional stretch performance, transverse impact performance and the Z-direction performance at thickness of slab 1/4 place and thickness of slab 1/2 place for details.
Description of drawings
Fig. 1 is that test steel embodiment 3 thicknesss of slab 1/4 of the present invention are in the typical figure of tissue topography under the metaloscope.
Fig. 2 is that test steel embodiment 4 thicknesss of slab 1/4 of the present invention are in the typical figure of tissue topography under the metaloscope.
Embodiment
Embodiment 1-4
Implementing 1-4 is the heat treating method of 50-100mm thick non-hardening attitude Marine Engineering Steel:
The thick oceanographic engineering of the 50mm of embodiment 1 heat treating method of E36-Z35 steel plate, specific as follows:
Normalizing process for the first time: 600 ℃ of heating of first paragraph, the intensification coefficient is 1.6min/mm, insulation 20min after the temperature, 900 ℃ of heating of second segment, the intensification coefficient is 1.5min/mm, insulation 20min after the temperature; Normalizing process for the second time: 600 ℃ of heating of first paragraph, the intensification coefficient is 1.6min/mm, insulation 30min after the temperature, 880 ℃ of heating of second segment, the intensification coefficient is 1.5min/mm, insulation 20min after the temperature; Tempering process is: 550 ℃ of tempering temperatures, total tempering time is 2.5 min/mm.Obtain the thick oceanographic engineering of 50mm E36-Z35 steel plate.
The thick oceanographic engineering of the 70mm of embodiment 2 heat treating method of E36-Z35 steel plate, specific as follows:
Normalizing process for the first time: 650 ℃ of heating of first paragraph, the intensification coefficient is 1.3 min/mm, insulation 30min after the temperature, 950 ℃ of heating of second segment, the intensification coefficient is 1.2min/mm, insulation 30min after the temperature; Normalizing process for the second time: 650 ℃ of heating of first paragraph, the intensification coefficient is 1.3 min/mm, insulation 30min after the temperature, 930 ℃ of heating of second segment, the intensification coefficient is 1.2min/mm, insulation 30min after the temperature; Tempering process is: 640 ℃ of tempering temperatures, total tempering time is 2.0 min/mm.Obtain the thick oceanographic engineering of 70mm E36-Z35 steel plate.
The thick oceanographic engineering of the 80mm of embodiment 3 heat treating method of E36-Z35 steel plate, specific as follows:
Normalizing process for the first time: 630 ℃ of heating of first paragraph, the intensification coefficient is 1.4 min/mm, insulation 28min after the temperature, 930 ℃ of heating of second segment, the intensification coefficient is 1.3min/mm, insulation 28min after the temperature; Normalizing process for the second time: 630 ℃ of heating of first paragraph, the intensification coefficient is 1.4min/mm, insulation 28min after the temperature, 910 ℃ of heating of second segment, the intensification coefficient is 1.3min/mm, insulation 28min after the temperature; Tempering process is: 600 ℃ of tempering temperatures, total tempering time is 2.5 min/mm.Obtain the thick oceanographic engineering of 80mm E36-Z35 steel plate.
The thick oceanographic engineering of the 100mm of embodiment 4 heat treating method of E36-Z35 steel plate, specific as follows:
Normalizing process for the first time: 640 ℃ of heating of first paragraph, the intensification coefficient is 1.5min/mm, insulation 23min after the temperature, 920 ℃ of heating of second segment, the intensification coefficient is 1.4min/mm, insulation 23min after the temperature; Normalizing process for the second time: 640 ℃ of heating of first paragraph, the intensification coefficient is 1.5min/mm, insulation 23min after the temperature, 900 ℃ of heating of second segment, the intensification coefficient is 1.4min/mm, insulation 23min after the temperature; Tempering process is: 620 ℃ of tempering temperatures, total tempering time is 2.4 min/mm.Obtain the thick oceanographic engineering of 100mm E36-Z35 steel plate.
Fig. 1 is that test steel embodiment 3 thicknesss of slab 1/4 of the present invention are in the typical figure of tissue topography under the metaloscope, Fig. 2 is that test steel embodiment 4 thicknesss of slab 1/4 of the present invention are in the typical figure of tissue topography under the metaloscope, can be found out by Fig. 1 and Fig. 2 to be organized as tiny uniform ferrite+a small amount of perlite.
After the thermal treatment, cross directional stretch performance such as the table 1 at the transverse cold bending performance of embodiment 1-4 and thickness of slab 1/4 place and thickness of slab 1/2 place, transverse impact performance such as table 2, Z-direction performance such as table 3.
Steel plate cross directional stretch performance after table 1 thermal treatment and transverse cold bending performance
Steel plate transverse impact performance after table 2 thermal treatment
Steel plate Z-direction performance after table 3 thermal treatment
1-3 can find out by table, the mechanical property of embodiment 1-4 is better than E36N-Z35 requirement among the GB712, yield strength 〉=362MPa, tensile strength 〉=527MPa, unit elongation 〉=31%, Z-direction relative reduction in area 〉=65%, thickness of slab 1/4 place-40 ℃ ballistic work on average reaches more than the 180J, thickness of slab 1/2 place-40 ℃ ballistic work on average reaches more than the 160J, and cold-bending property is qualified, and performance index satisfy the requirement that the thick oceanographic engineering of 50-100mm is used the E36N-Z35 steel plate.Have stable processing technique, require less, mill capacity to require the characteristics such as less, high comprehensive performance to Inner Quality of Billet.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (5)
1. the heat treating method of a special thick non-hardening attitude steel plate for ocean engineering is characterized in that:
⑴ the thickness of steel plate is 50-100mm;
⑵ adopt double normalizing+tempering process, and normalizing temperature is more than or equal to the normalizing temperature second time for the first time; Normalizing process for the first time: the zone heating insulation, first paragraph 600-650 ℃ heating, the intensification coefficient is 1.3-1.6min/mm, insulation 20-30min after the temperature, second segment 890-950 ℃ heating, the intensification coefficient is 1.2-1.5min/mm, insulation 20-30min after the temperature; Normalizing process for the second time: the zone heating insulation, first paragraph 600-650 ℃ heating, the intensification coefficient is 1.3-1.6min/mm, insulation 20-30min after the temperature, second segment 880-930 ℃ heating, the intensification coefficient is 1.2-1.5min/mm, insulation 20-30min after the temperature; Tempering process is: tempering temperature 550-640 ℃, total tempering time is 2.0-2.5min/mm.
2. the heat treating method of special thick non-hardening attitude steel plate for ocean engineering as claimed in claim 1 is characterized in that:
Described steel plate is the thick oceanographic engineering of 50mm E36-Z35 steel plate, and heat treating method is specific as follows:
Normalizing process for the first time: 600 ℃ of heating of first paragraph, the intensification coefficient is 1.6min/mm, insulation 20min after the temperature, 900 ℃ of heating of second segment, the intensification coefficient is 1.5min/mm, insulation 20min after the temperature; Normalizing process for the second time: 600 ℃ of heating of first paragraph, the intensification coefficient is 1.6min/mm, insulation 30min after the temperature, 880 ℃ of heating of second segment, the intensification coefficient is 1.5min/mm, insulation 20min after the temperature; Tempering process is: 550 ℃ of tempering temperatures, total tempering time is 2.5min/mm.
3. the heat treating method of special thick non-hardening attitude steel plate for ocean engineering as claimed in claim 1 is characterized in that:
Described steel plate is the thick oceanographic engineering of 70mm E36-Z35 steel plate, and heat treating method is specific as follows:
Normalizing process for the first time: 650 ℃ of heating of first paragraph, the intensification coefficient is 1.3min/mm, insulation 30min after the temperature, 950 ℃ of heating of second segment, the intensification coefficient is 1.2min/mm, insulation 30min after the temperature; Normalizing process for the second time: 650 ℃ of heating of first paragraph, the intensification coefficient is 1.3min/mm, insulation 30min after the temperature, 930 ℃ of heating of second segment, the intensification coefficient is 1.2min/mm, insulation 30min after the temperature; Tempering process is: 640 ℃ of tempering temperatures, total tempering time is 2.0 min/mm.
4. the heat treating method of special thick non-hardening attitude steel plate for ocean engineering as claimed in claim 1 is characterized in that:
Described steel plate is the thick oceanographic engineering of 80mm E36-Z35 steel plate, and heat treating method is specific as follows:
Normalizing process for the first time: 630 ℃ of heating of first paragraph, the intensification coefficient is 1.4min/mm, insulation 28min after the temperature, 930 ℃ of heating of second segment, the intensification coefficient is 1.3min/mm, insulation 28min after the temperature; Normalizing process for the second time: 630 ℃ of heating of first paragraph, the intensification coefficient is 1.4min/mm, insulation 28min after the temperature, 910 ℃ of heating of second segment, the intensification coefficient is 1.3min/mm, insulation 28min after the temperature; Tempering process is: 600 ℃ of tempering temperatures, total tempering time is 2.5 min/mm.
5. the heat treating method of special thick non-hardening attitude steel plate for ocean engineering as claimed in claim 1 is characterized in that:
Described steel plate is the thick oceanographic engineering of 100mm E36-Z35 steel plate, and heat treating method is specific as follows:
Normalizing process for the first time: 640 ℃ of heating of first paragraph, the intensification coefficient is 1.5min/mm, insulation 23min after the temperature, 920 ℃ of heating of second segment, the intensification coefficient is 1.4min/mm, insulation 23min after the temperature; Normalizing process for the second time: 640 ℃ of heating of first paragraph, the intensification coefficient is 1.5min/mm, insulation 23min after the temperature, 900 ℃ of heating of second segment, the intensification coefficient is 1.4min/mm, insulation 23min after the temperature; Tempering process is: 620 ℃ of tempering temperatures, total tempering time is 2.4min/mm.
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Cited By (8)
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| CN104174820A (en) * | 2014-08-22 | 2014-12-03 | 常熟市虹桥铸钢有限公司 | Casting process of two-stage planet carrier of climbing machine for ocean platform |
| CN104212954A (en) * | 2014-08-27 | 2014-12-17 | 南京钢铁股份有限公司 | Heat treatment method for efficient normalizing of low-alloy steel |
| CN104357623A (en) * | 2014-11-16 | 2015-02-18 | 新余钢铁集团有限公司 | Normalizing thermal treatment process for low-temperature toughness steel plate being 120-200mm in thickness |
| CN104889540A (en) * | 2015-05-29 | 2015-09-09 | 武汉凯奇特种焊接设备有限责任公司 | Argon arc welder and welding technology with online continuous weld seam heat processing |
| CN104889555A (en) * | 2015-05-29 | 2015-09-09 | 武汉凯奇特种焊接设备有限责任公司 | Electric resistance welder and welding technology with on-line continuous weld seam heat processing |
| CN108950148A (en) * | 2018-07-30 | 2018-12-07 | 钢铁研究总院 | Improve G115 steel large-sized heavy-wall tube radially tissue and performance uniformity method |
| CN109055687A (en) * | 2018-07-27 | 2018-12-21 | 武汉重工铸锻有限责任公司 | A kind of heat treatment method that can improve 35Mn steel forgings impact property |
| CN109576456A (en) * | 2019-01-18 | 2019-04-05 | 辽宁福鞍重工股份有限公司 | A kind of heat treatment process refining large-scale steel-casting grain size |
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Cited By (9)
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| CN104174820A (en) * | 2014-08-22 | 2014-12-03 | 常熟市虹桥铸钢有限公司 | Casting process of two-stage planet carrier of climbing machine for ocean platform |
| CN104174820B (en) * | 2014-08-22 | 2016-08-24 | 常熟市虹桥铸钢有限公司 | A kind of ocean platform climbs the casting technique of machine secondary planet frame |
| CN104212954A (en) * | 2014-08-27 | 2014-12-17 | 南京钢铁股份有限公司 | Heat treatment method for efficient normalizing of low-alloy steel |
| CN104357623A (en) * | 2014-11-16 | 2015-02-18 | 新余钢铁集团有限公司 | Normalizing thermal treatment process for low-temperature toughness steel plate being 120-200mm in thickness |
| CN104889540A (en) * | 2015-05-29 | 2015-09-09 | 武汉凯奇特种焊接设备有限责任公司 | Argon arc welder and welding technology with online continuous weld seam heat processing |
| CN104889555A (en) * | 2015-05-29 | 2015-09-09 | 武汉凯奇特种焊接设备有限责任公司 | Electric resistance welder and welding technology with on-line continuous weld seam heat processing |
| CN109055687A (en) * | 2018-07-27 | 2018-12-21 | 武汉重工铸锻有限责任公司 | A kind of heat treatment method that can improve 35Mn steel forgings impact property |
| CN108950148A (en) * | 2018-07-30 | 2018-12-07 | 钢铁研究总院 | Improve G115 steel large-sized heavy-wall tube radially tissue and performance uniformity method |
| CN109576456A (en) * | 2019-01-18 | 2019-04-05 | 辽宁福鞍重工股份有限公司 | A kind of heat treatment process refining large-scale steel-casting grain size |
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Application publication date: 20130501 |