CN103045942A - Method for manufacturing extremely thick marine engineering steel plate with excellent low-temperature brittle fracture resistance - Google Patents
Method for manufacturing extremely thick marine engineering steel plate with excellent low-temperature brittle fracture resistance Download PDFInfo
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Abstract
The invention discloses an extremely thick marine engineering steel plate with excellent low-temperature brittle fracture resistance and a manufacturing method thereof. The manufacturing method comprises the following steps of: performing a controlled rolling and controlled cooling process, wherein the heating temperature before rolling is 1,180-1,250 DEG C, the rough rolling temperature is 1,000-1,150 DEG C and the finish rolling temperature is 850-920 DEG C; performing laminar cooling after rolling, wherein the final cooling temperature is 500-750 DEG C, the cooling rate is 5-15 DEG C/s, and subsequently performing air cooling; normalizing, wherein the normalizing temperature is 870-950 DEG C and the total heat-preserving time is 160-220 min; and performing controlled cooling after normalizing, wherein the re-reddening temperature is 400-700 DEG C and the cooling rate of 5-15 DEG C/s, and subsequently performing air cooling. The manufactured marine engineering steel E36N-Z35 not only has high strength, high plasticity and good Z-direction lamellar tearing resistance, but also has excellent low-temperature brittle fracture resistance.
Description
Technical field
The present invention relates to a kind of manufacture method of engineering steel, specifically the manufacture method of the good special thick steel plate for ocean engineering of a kind of anti-low temperature brittleness fracture property.
Background technology
Along with the sharp increase of Global Oil natural gas energy resource demand, the difficulty of land resources exploitation strengthen day by day, wide ocean has become Global Oil natural gas source exploitation new growth point, and the marine engineering equipment production also becomes the major fields that countries in the world put forth effort to develop day by day.
Marine engineering equipment is mainly used in probing, exploitation and the exploitation of relevant auxiliary products of offshore oil and gas, have the characteristics such as hi-tech, high investment, high added value and excessive risk, reliability and security requirement to product are very high, have become in recent years national governments and have given special assistance to the strategic industry of development and the high-end field that shipbuilding enterprise is competitively competed.Marine Engineering Steel mainly can be divided into offshore platform steel, ocean energy resources equipment steel and benthal oil-gas pipeline steel three major types according to its homework type and characteristics.Ocean platform is the Code in Hazardous Special Locations that carries out operation in the ocean, be mainly used in probing and the exploitation of offshore oil and gas, wherein drilling installation mainly comprises self-elevating drilling platform and semi-submersible rig, and production facility mainly comprises fixed jacket platform, complies with tower platform, tension leg platform (TLP), Spar Platform and floating production storage unit etc.Phase is higher by 50% than boats and ships class because ocean platform is on active service, the steel plate that adopts must have high strength, high tenacity, antifatigue, anti-lamellar tearing, good weldability and seawater corrosion resistance etc., the main rank of international ocean Platform Steel is yield strength 355MPa at present, 420MPa and 460MPa etc.Along with the development of China's ocean exploitation, the demand of offshore platform steel is constantly enlarged, current offshore platform steel year, total demand was more than 3,000,000 tons.
The special thick high-strong toughness E36-Z35 steel plate of thickness＞60～80mm is oceanographic engineering key position steel, be applied in the severe ocean Working environment such as wave, tide, storm and cold floating ice, support platform and drilling outfit that gross weight surpasses hundreds of tons, in case the brittle rupture accident occurs, catastrophic often, occur in seconds, hard to guard against.These use characteristic have determined that thickness＞60～80mm E36-Z35 steel plate is except must having: 1. high cleanliness, low S, P, inclusion, gas content; 2. high-strong toughness, satisfy thickness of slab 1/4 place-40 ℃ ballistic work vertically 〉=50J(or laterally 〉=34J); 3. the anti-lamellar tearing performance of good Z-direction; 4. good weldability;
High strength; Good anti-brittle rupture performance also should be arranged, make ocean platform can not produce immediately fracture failure running under the extreme case, guarantee better personnel's safety and the work-ing life of improving ocean platform.
The method of estimating at present steel opposing low temperature brittleness fracture property mainly is according to ASTM E208 or GB/T 6803, measures nil-ductility temperature (NDT) by drop weight test.When the usage temperature is lower than the NDT temperature, steel survivability very low (non-plastic), so that very little crackle just can cause that plane strain destroys under dynamic yield stress.NDT temperature essence is exactly the top temperature of material generation brittle failure under the dynamic load conditions, is the parameter of evaluating material crack arrest feature.
Summary of the invention
The object of the invention is to: the manufacture method that proposes the good special thick Marine Engineering Steel of a kind of anti-low temperature brittleness fracture property, can make steel plate obtain the mixed structure of tiny uniform ferrite, bainite and a small amount of spheroidizing pearlite, obtain good anti-low temperature brittleness fracture property.
The present invention realizes that the technical scheme of above goal of the invention is:
The special thick steel plate for ocean engineering manufacture method that anti-low temperature brittleness fracture property is good, the steel plate chemical composition is by weight percentage: C:0.09-0.15%, Si:0.15-0.40%, Mn:1.00-1.60%, P≤0.015%, S≤0.005%, Nb:0.025-0.045%, V:0.040-0.065%, Ti:0.005-0.020%, Cr≤0.15%, Ni:0.10-0.40%, Cu≤0.15%, Al:0.0250-0.040%, O≤20ppm, N≤45ppm, H≤2ppm, surplus is Fe and inevitable impurity;
Manufacture method comprises:
Rolling process: adopt cooling controlling and rolling controlling process, controlled rolling is recrystallize and non-recrystallization district two stage rolling, and controlling cold is the laminar flow water cooling; Roll 1180 ℃～1250 ℃ of front continuous blank heating temperatures; 1000～1150 ℃ of recrystallization zone rolling temperatures, the inner columnar grain of broken blank and the inner austenite crystal of refinement blank; 850～920 ℃ of non-recrystallization district start rolling temperatures, rolling rear three roads, non-recrystallization district add up draft greater than 20%, obtain the austenite structure of high deformation sclerosis by the distortion in non-recrystallization district; Roll rear laminar flow cooling, 500～750 ℃ of final cooling temperatures, 5～15 ℃/s of rate of cooling; Air cooling subsequently;
Thermal treatment process: normalizing temperature is 870～950 ℃, total soaking time is 160～220min, control is cold after the normalizing, the type of cooling is water-cooled, 400～700 ℃ of red temperatures, 5～15 ℃/s of rate of cooling, air cooling subsequently, by the cold grain growth that prevents of the control after the normalizing, reduce pearlitic ratio, obtain the mixed structure of tiny uniform ferrite, bainite and a small amount of spheroidizing pearlite.
The present invention rolls 1180 ℃～1250 ℃ of front continuous blank heating temperatures, not only guaranteed the complete solid solution of microalloy element and but also prevent that excess Temperature from causing Austenite Grain Growth; The broken columnar grain of roughing (recrystallization zone is rolling) and seam blank subsurface defect and refine austenite crystal grain; The rear three roads accumulative total draft of finish rolling (the non-recrystallization district is rolling) is greater than 20%, distortion by the non-recrystallization district obtains the austenite of high deformation sclerosis and suitable cooling control technology (500～750 ℃ of final cooling temperatures, 5～15 ℃ of rate of cooling/s), the purpose of grain size after the controlled phase transformation.
The present invention carries out rational normalizing process, and (normalizing temperature is 870～950 ℃, and total soaking time is 160～220min, carries out water-cooled after the normalizing, 400～700 ℃ of red temperatures, 5～15 ℃/s of rate of cooling, subsequently air cooling; ) play following three purposes: (1) plays the effect that refined crystalline strengthening improves toughness simultaneously by controlled rolling and controlled cooling and normalizing grain refining; (2) eliminate unrelieved stress, homogenizing tissue, alleviate center segregation by normalizing, improve impact property, indirectly improve anti-low temperature brittleness fracture property; (3) cold by the control after the normalizing, prevent grain growth, reduce pearlitic ratio, obtain the mixed structure of tiny uniform ferrite, bainite and a small amount of spheroidizing pearlite, be conducive to obtain good anti-low temperature brittleness fracture property.
The specific performance index of the steel plate that makes by above technology controlling and process is: lower yield strength ReL 〉=355MPa, tensile strength Rm490-630MPa, unit elongation 〉=21%, thickness of slab 1/4 place-40 ℃ ballistic work vertically 〉=50J(laterally 〉=34J), thickness direction relative reduction in area 〉=35%.
The invention has the beneficial effects as follows:
⑴ the good special thick steel plate for ocean engineering manufacture method of anti-low temperature brittleness fracture property of the present invention exploitation, it is not that too high, general plate mill all can be produced that mill load is required, therefore, suitability is wide, is fit to the most domestic Heavy Plate Plant and produces.
⑵ by the smelting of Clean Steel, reduces blank segregation and the subsurface defect such as loose, and effectively controls the content of the elements such as N, H; By the broken column crystal of roughing and refine austenite crystal grain; Cold by finish rolling accumulated deformation and cooperation control, the purpose of grain size after the controlled hot rolling.
By rational normalizing and cooling control technology can: 1. crystal grain thinning, improve intensity and improve simultaneously toughness; 2. eliminate unrelieved stress, homogenizing tissue, alleviate center segregation by normalizing, improve impact property, indirectly improve anti-brittle rupture performance; 3. the control tissue reduces pearlitic ratio, obtains the mixed structure of tiny uniform ferrite, bainite and a small amount of spheroidizing pearlite, is conducive to obtain good anti-low temperature brittleness fracture property.
Description of drawings
Fig. 1 is that the E36N-Z35 steel plate thickness of slab 1/4 that obtains after embodiment 2 thermal treatments is in the typical figure of tissue topography under the metaloscope;
Fig. 2 is that the E36N-Z35 steel plate thickness of slab 1/2 that obtains after embodiment 2 thermal treatments is in the typical figure of tissue topography under the metaloscope;
Fig. 3 is that the E36N-Z35 steel plate thickness of slab 1/4 that obtains after embodiment 3 thermal treatments is in the typical figure of tissue topography under the metaloscope.
Fig. 4 is that the E36N-Z35 steel plate thickness of slab 1/2 that obtains after embodiment 3 thermal treatments is in the typical figure of tissue topography under the metaloscope.
Embodiment
Embodiment 1-
3
The special thick oceanographic engineering of the anti-brittle rupture excellent property of embodiment 1-3 is as shown in table 1 with the chemical composition of E36N-Z35 steel plate:
The chemical composition (wt%) of table 1 embodiment 1-3
The oceanographic engineering of the thick anti-brittle rupture excellent property of the 60mm of embodiment 1 production method of E36N-Z35 steel plate, specific as follows:
Hot metal pretreatment-converter smelting-LF-RH-continuous casting-heating of plate blank-rolling-control is cold-and normalizing-control is cold.
Smelting and control according to Clean Steel: sulphur falls in hot metal pretreatment; Converter adopts double slag process to fall phosphorus and the tapping pushing off the slag prevents rephosphorization; Guarantee the white slag refining time, the constituent contents such as S, O in dross inclusion adsorption and the minimizing steel; Use calcium is processed, and improves inclusion morphology; Vacuum-treat reduces the harmful element content such as H, N; Control superheating temperature and pulling rate finally obtain the good continuously cast bloom of internal soundness.
Rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Roll 1250 ℃ of front continuous blank heating temperatures; 1100 ℃ of roughing temperature; 920 ℃ of finish rolling start rolling temperatures, rear three roads accumulation draft 20%; Roll rear laminar flow cooling, 700 ℃ of final cooling temperatures, 15 ℃/s of rate of cooling; Air cooling subsequently.
Thermal treatment process: normalizing temperature is 930 ℃, and total soaking time is 180min, after the normalizing control cold, the type of cooling is water-cooled, 450 ℃ of red temperatures, 8 ℃/s of rate of cooling, subsequently air cooling.
The oceanographic engineering of the thick anti-brittle rupture excellent property of the 80mm of embodiment 2 production method of E36N-Z35 steel plate, specific as follows:
Hot metal pretreatment-converter smelting-LF-RH-continuous casting-heating of plate blank-rolling-control is cold-and normalizing-control is cold.
Smelting and control according to Clean Steel: sulphur falls in hot metal pretreatment; Converter adopts double slag process to fall phosphorus and the tapping pushing off the slag prevents rephosphorization; Guarantee the white slag refining time, the constituent contents such as S, O in dross inclusion adsorption and the minimizing steel; Use calcium is processed, and improves inclusion morphology; Vacuum-treat reduces the harmful element content such as H, N; Control superheating temperature and pulling rate finally obtain the good continuously cast bloom of internal soundness.
Rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Roll 1200 ℃ of front continuous blank heating temperatures; 1080 ℃ of roughing temperature; 900 ℃ of finish rolling start rolling temperatures, rear three roads accumulation draft 25%; Roll rear laminar flow cooling, 680 ℃ of final cooling temperatures, 12 ℃/s of rate of cooling; Air cooling subsequently.
Thermal treatment process: normalizing temperature is 910 ℃, and total soaking time is 200min, after the normalizing control cold, the type of cooling is water-cooled, 500 ℃ of red temperatures, 5 ℃/s of rate of cooling, subsequently air cooling.
The oceanographic engineering of the thick anti-brittle rupture excellent property of the 80mm of embodiment 3 production method of E36N-Z35 steel plate, specific as follows:
Hot metal pretreatment-converter smelting-LF-RH-continuous casting-heating of plate blank-rolling-control is cold-and normalizing-control is cold.
Smelting and control according to Clean Steel: sulphur falls in hot metal pretreatment; Converter adopts double slag process to fall phosphorus and the tapping pushing off the slag prevents rephosphorization; Guarantee the white slag refining time, the constituent contents such as S, O in dross inclusion adsorption and the minimizing steel; Use calcium is processed, and improves inclusion morphology; Vacuum-treat reduces the harmful element content such as H, N; Control superheating temperature and pulling rate finally obtain the good continuously cast bloom of internal soundness.
Rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Roll 1180 ℃ of front continuous blank heating temperatures; 1000 ℃ of roughing temperature; 870 ℃ of finish rolling start rolling temperatures, rear three roads accumulation draft 28%; Roll rear laminar flow cooling, 400 ℃ of final cooling temperatures, 10 ℃/s of rate of cooling; Air cooling subsequently.
Thermal treatment process: normalizing temperature is 870 ℃, and total soaking time is 220min, after the normalizing control cold, the type of cooling is water-cooled, 610 ℃ of red temperatures, 15 ℃/s of rate of cooling, subsequently air cooling.
Fig. 1 and Fig. 2 are that the E36N-Z35 steel plate thickness of slab 1/4 and 1/2 that obtains after embodiment 2 thermal treatments is in the typical figure of tissue topography under the metaloscope; Fig. 3 and Fig. 4 are that the E36N-Z35 steel plate thickness of slab 1/4 and 1/2 that obtains after embodiment 3 thermal treatments is in the typical figure of tissue topography under the metaloscope.As seen from the figure, after the cold and hot processing of normalizing+control, fine microstructures is even, and the pearlitic structure ratio is very low, and banded structure is also lighter.
After the cold and hot processing of normalizing+control, the cross directional stretch performance at the transverse cold bending performance of embodiment 1-3 and thickness of slab 1/4 place and thickness of slab 1/2 place such as table 2, transverse impact performance such as table 3, Z-direction performance such as table 4, anti-brittle rupture (NDT) performance such as table 5:
Steel plate cross directional stretch and transverse cold bending performance after table 2 normalizing+cold and hot processing of control
The transverse impact performance of steel plate after table 3 normalizing+cold and hot processing of control
Steel plate Z-direction performance after table 4 normalizing+cold and hot processing of control
NDT performance after table 5 normalizing+cold and hot processing of control
2-5 can find out by table, the mechanical property of embodiment 1-3 is far superior to E36N-Z35 requirement among the GB 712, yield strength 〉=395, tensile strength 〉=549, unit elongation 〉=27%, Z-direction sectional shrinkage 〉=60%,-40 ℃ of ballistic works on average reach more than the 124J, and the NDT temperature all is-60 ℃, far below-40 ℃ requirement, have good anti-brittle rupture performance, satisfy the requirement that the thick oceanographic engineering of 60～80mm is used the E36N-Z35 steel plate.Has stable processing technique, properties, the particularly good characteristics of anti-low temperature brittleness fracture property.
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 good special thick steel plate for ocean engineering manufacture method of anti-low temperature brittleness fracture property, it is characterized in that: described steel plate chemical composition is by weight percentage: C:0.09-0.15%, Si:0.15-0.40%, Mn:1.00-1.60%, P≤0.015%, S≤0.005%, Nb:0.025-0.045%, V:0.040-0.065%, Ti:0.005-0.020%, Cr≤0.15%, Ni:0.10-0.40%, Cu≤0.15%, Al:0.0250-0.040%, O≤20ppm, N≤45ppm, H≤2ppm, surplus is Fe and inevitable impurity;
Described manufacture method comprises:
Rolling process: adopt cooling controlling and rolling controlling process, controlled rolling is recrystallize and non-recrystallization district two stage rolling, and controlling cold is the laminar flow water cooling; Roll 1180 ℃～1250 ℃ of front continuous blank heating temperatures; 1000～1150 ℃ of recrystallization zone rolling temperatures, the inner columnar grain of broken blank and the inner austenite crystal of refinement blank; 850～920 ℃ of non-recrystallization district start rolling temperatures, rolling rear three roads, non-recrystallization district add up draft greater than 20%, obtain the austenite structure of high deformation sclerosis by the distortion in non-recrystallization district; Roll rear laminar flow cooling, 500～750 ℃ of final cooling temperatures, 5～15 ℃/s of rate of cooling; Air cooling subsequently;
Thermal treatment process: normalizing temperature is 870～950 ℃, total soaking time is 160～220min, control is cold after the normalizing, the type of cooling is water-cooled, 400～700 ℃ of red temperatures, 5～15 ℃/s of rate of cooling, air cooling subsequently, by the cold grain growth that prevents of the control after the normalizing, reduce pearlitic ratio, obtain the mixed structure of tiny uniform ferrite, bainite and a small amount of spheroidizing pearlite.
2. the good special thick steel plate for ocean engineering manufacture method of anti-low temperature brittleness fracture property as claimed in claim 1, it is characterized in that: the performance of the steel plate that makes is: lower yield strength ReL 〉=355MPa, tensile strength Rm490-630MPa, unit elongation 〉=21%, thickness of slab 1/4 place-40 ℃ ballistic work vertically 〉=50J, laterally 〉=and 34J, thickness direction relative reduction in area 〉=35%.
3. the good special thick steel plate for ocean engineering manufacture method of anti-low temperature brittleness fracture property as claimed in claim 1 or 2, it is characterized in that: described steel plate chemical composition is by weight percentage: C:0.09%, Si:0.30%, Mn:1.60%, P:0.008%, S:0.002%, Nb:0.035%, V:0.058%, Ti:0.009%, Cr:0.09%, Ni:0.25%, Cu:0.11%, Al:0.030%, O:0.0015%, N:0.0034%, H:0.00015%, surplus is Fe and inevitable impurity;
Described manufacture method comprises: and hot metal pretreatment-converter smelting-LF-RH-continuous casting-heating of plate blank-rolling-control is cold-and normalizing-control is cold;
Smelting and control according to Clean Steel: sulphur falls in hot metal pretreatment; Converter adopts double slag process to fall phosphorus and the tapping pushing off the slag prevents rephosphorization; Guarantee the white slag refining time, the constituent contents such as S, O in dross inclusion adsorption and the minimizing steel; Use calcium is processed, and improves inclusion morphology; Vacuum-treat reduces the harmful element content such as H, N; Control superheating temperature and pulling rate finally obtain the good continuously cast bloom of internal soundness;
Rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Roll 1250 ℃ of front continuous blank heating temperatures; 1100 ℃ of roughing temperature; 920 ℃ of finish rolling start rolling temperatures, rear three roads accumulation draft 20%; Roll rear laminar flow cooling, 700 ℃ of final cooling temperatures, 15 ℃/s of rate of cooling; Air cooling subsequently;
Thermal treatment process: normalizing temperature is 930 ℃, and total soaking time is 180min, after the normalizing control cold, the type of cooling is water-cooled, 450 ℃ of red temperatures, 8 ℃/s of rate of cooling, subsequently air cooling.
4. the good special thick steel plate for ocean engineering manufacture method of anti-low temperature brittleness fracture property as claimed in claim 1 or 2, it is characterized in that: described steel plate chemical composition is by weight percentage: C:0.15%, Si:0.20%, Mn:1.45%, P:0.007%, S:0.003%, Nb:0.025%, V:0.045%, Ti:0.012%, Cr:0.06%, Ni:0.38%, Cu:0.12%, Al:0.028%, O:0.0018%, N:0.0035%, H:0.00018%, surplus is Fe and inevitable impurity;
Described manufacture method comprises: and hot metal pretreatment-converter smelting-LF-RH-continuous casting-heating of plate blank-rolling-control is cold-and normalizing-control is cold;
Smelting and control according to Clean Steel: sulphur falls in hot metal pretreatment; Converter adopts double slag process to fall phosphorus and the tapping pushing off the slag prevents rephosphorization; Guarantee the white slag refining time, the constituent contents such as S, O in dross inclusion adsorption and the minimizing steel; Use calcium is processed, and improves inclusion morphology; Vacuum-treat reduces the harmful element content such as H, N; Control superheating temperature and pulling rate finally obtain the good continuously cast bloom of internal soundness;
Rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Roll 1200 ℃ of front continuous blank heating temperatures; 1080 ℃ of roughing temperature; 900 ℃ of finish rolling start rolling temperatures, rear three roads accumulation draft 25%; Roll rear laminar flow cooling, 680 ℃ of final cooling temperatures, 12 ℃/s of rate of cooling; Air cooling subsequently;
Thermal treatment process: normalizing temperature is 910 ℃, and total soaking time is 200min, after the normalizing control cold, the type of cooling is water-cooled, 500 ℃ of red temperatures, 5 ℃/s of rate of cooling, subsequently air cooling.
5. the good special thick steel plate for ocean engineering manufacture method of anti-low temperature brittleness fracture property as claimed in claim 1 or 2, it is characterized in that: described steel plate chemical composition is by weight percentage: C:0.13%, Si:0.25%, Mn:1.53%, P:0.006%, S:0.002%, Nb:0.030%, V:0.060%, Ti:0.011%, Cr:0.08%, Ni:0.35%, Cu:0.10%, Al:0.025%, O:0.0016%, N:0.0033%, H:0.00012%, surplus is Fe and inevitable impurity;
Described manufacture method comprises: and hot metal pretreatment-converter smelting-LF-RH-continuous casting-heating of plate blank-rolling-control is cold-and normalizing-control is cold;
Smelting and control according to Clean Steel: sulphur falls in hot metal pretreatment; Converter adopts double slag process to fall phosphorus and the tapping pushing off the slag prevents rephosphorization; Guarantee the white slag refining time, the constituent contents such as S, O in dross inclusion adsorption and the minimizing steel; Use calcium is processed, and improves inclusion morphology; Vacuum-treat reduces the harmful element content such as H, N; Control superheating temperature and pulling rate finally obtain the good continuously cast bloom of internal soundness;
Rolling technology: adopting cooling controlling and rolling controlling process, is two stage rolling; Roll 1180 ℃ of front continuous blank heating temperatures; 1000 ℃ of roughing temperature; 870 ℃ of finish rolling start rolling temperatures, rear three roads accumulation draft 28%; Roll rear laminar flow cooling, 400 ℃ of final cooling temperatures, 10 ℃/s of rate of cooling; Air cooling subsequently;
Thermal treatment process: normalizing temperature is 870 ℃, and total soaking time is 220min, after the normalizing control cold, the type of cooling is water-cooled, 610 ℃ of red temperatures, 15 ℃/s of rate of cooling, subsequently air cooling.
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| CN103667921A (en) * | 2013-12-18 | 2014-03-26 | 武汉钢铁(集团)公司 | Thick steel plate with high strength and toughness as well as uniform performance in thickness direction and production method of thick steel plate |
| CN103952646A (en) * | 2014-05-05 | 2014-07-30 | 莱芜钢铁集团有限公司 | Low-temperature resistant low-alloy structural steel and preparation method thereof |
| CN104004962A (en) * | 2014-05-08 | 2014-08-27 | 南京钢铁股份有限公司 | High-welding heat input normalized steel plate for oceanographic engineering and manufacturing method thereof |
| CN104004962B (en) * | 2014-05-08 | 2016-08-24 | 南京钢铁股份有限公司 | A kind of ocean engineering normalized steel plate welding high heat input and manufacture method thereof |
| CN104263905A (en) * | 2014-10-10 | 2015-01-07 | 南京钢铁股份有限公司 | Control method for performing NAC (normalizing and accelerated cooling) on marine board by hardening machine |
| CN105220068A (en) * | 2015-10-20 | 2016-01-06 | 南京钢铁股份有限公司 | A kind of special thick Marine Engineering Steel and preparation method thereof |
| CN105369132A (en) * | 2015-11-10 | 2016-03-02 | 湖南华菱湘潭钢铁有限公司 | Production method of steel for large-section ocean platform |
| JP2017137521A (en) * | 2016-02-01 | 2017-08-10 | 新日鐵住金株式会社 | Thick steel sheet and manufacturing method therefor |
| CN105969964A (en) * | 2016-06-27 | 2016-09-28 | 舞阳钢铁有限责任公司 | Production method for high-toughness ultra-thick steel plate at position half of plate thickness |
| CN107557690B (en) * | 2016-06-30 | 2019-03-26 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacturing method of a kind of low temperature resistant and anti-lamellar tearing |
| CN107557690A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacture method of a kind of low temperature resistant and anti-lamellar tearing |
| CN108359894A (en) * | 2018-02-23 | 2018-08-03 | 舞阳钢铁有限责任公司 | The big thickness low-alloy chrome molybdenum steel plate of low-temperature impact-resistant and its production method |
| CN108914005A (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 the spy's thickness anti-corrosion steel plate and its production method of the excellent in low temperature toughness of yield strength > 460MPa |
| CN108914005B (en) * | 2018-08-10 | 2020-11-10 | 宝武集团鄂城钢铁有限公司 | Super-thick corrosion-resistant steel plate with yield strength larger than 460MPa and excellent low-temperature toughness and production method thereof |
| CN109266958A (en) * | 2018-09-19 | 2019-01-25 | 江阴兴澄特种钢铁有限公司 | Serial Naval Architecture and Ocean Engineering F grades of steel and its Flexible Production method |
| CN110923412A (en) * | 2019-12-11 | 2020-03-27 | 南阳汉冶特钢有限公司 | 14Cr1MoR (H) steel plate for ultra-large-thickness high-pressure low-temperature container and production method thereof |
| CN111334721A (en) * | 2020-04-16 | 2020-06-26 | 山东钢铁集团日照有限公司 | Normalized rolling medium-thick ship plate steel and production method thereof for eliminating banded structure |
| CN111826579A (en) * | 2020-06-01 | 2020-10-27 | 山东钢铁股份有限公司 | Production control method of steel EH36 for ocean platform |
| CN113462980A (en) * | 2021-07-01 | 2021-10-01 | 中信金属股份有限公司 | Corrosion-resistant high-strength high-toughness steel for cast nodes in low-temperature environment and preparation method thereof |
| CN115341139A (en) * | 2022-07-20 | 2022-11-15 | 南京钢铁股份有限公司 | Super-thick Q460GJ steel plate with thickness of more than 100mm and manufacturing method thereof |
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