CN104726769B - Big thickness ocean platform S355G10+N steel plate and production method thereof - Google Patents
Big thickness ocean platform S355G10+N steel plate and production method thereof Download PDFInfo
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Abstract
The invention discloses a kind of big thickness ocean platform S355G10+N steel plate and production method thereof, it includes smelting, casts, heats, rolls, cools down and heat treatment step；The percentage by weight of described steel plate chemical composition is: C 0.08～0.12%, Si 0.15～0.50%, Mn 1.40～1.65%, P≤0.015%, S≤0.005%, V 0.040～0.060%, Nb 0.020～0.030%, Al 0.020～0.050%, Ceq≤0.43, Pcm≤0.22, remaining is Fe and inevitable impurity.This steel plate takes low-carbon (LC), the mentality of designing of high microalloying on composition designs, and solves carbon, manganese segregation problems and high intensity, high impact toughness and the requirement of wide cold-bending property；Under conditions of low-carbon (LC), low-carbon-equivalent, guarantee steel plate quenching degree, there is good tissue, combination property and welding performance.This steel plate mechanical performance, welding performance, processing characteristics are good, it is possible to meet the requirement of marine engineering equipment manufacturer's construction technology condition.
Description
Technical field
The present invention relates to a kind of ocean engineering structural steel and iron, especially a kind of big thickness ocean platform S355G10+N steel plate and production method thereof.
Background technology
At China's sea petrol resources exploitation, marine engineering equipment manufacturing industry is the strategic industry providing equipment for ocean development.Expecting the year two thousand twenty global ocean engineer equipment market investment will be more than 120,000,000,000 yuan, and wherein platform and ocean engineering ship invest about 70,000,000,000 yuan, and deep water equipment investment accounts for more than 45%.International ocean Platform Steel Major grades is 355,420,460MPa at present, and China there is no special offshore platform steel standard, uses foreign standard.Below EH36 Platform Steel realizes production domesticization substantially, accounts for the 90% of Platform Steel amount, but used by key position, big thickness, high strength steel still rely on import.
EN10225 EU criteria, it is stipulated that the chemical composition of offshore platform structure steel, mechanical property, welding performance, nondestructive inspection etc..Steel plate for ocean engineering has the requirement that comparison is special to the performance of steel, and slab application amount is big, and to thickness effect, Z-direction performance, resisting fatigue and fracture property, low-temperature impact resistance etc., all there are strict requirements.Domestic can produce at present be suitable for country's oilfield exploitation needed for the steel mill of all kinds of offshore platform steels few, technically use the techniques such as low-carbon-equivalent, microalloying, high cleanliness, Ca process, controlled rolling.
Along with the development of China's ocean development, constantly expanding the demand of offshore platform steel, current Weight of steel is at 3,000,000 more than t.But big wall thickness deep-sea, the seabed pipe line steel etc. of superhigh intensity, big thickness steel plate, the Z-direction steel of anti-lamellar tearing and deep-sea gas engineering used by key position, domestic only indivedual steel mills can produce, such as Wugang company.Steel mill is also in research and development advanced development, most dependence on import mostly.Current ocean platform Weight of steel is more than 3,000,000 tons.Along with the development of China's ocean development, the demand of offshore platform steel also will constantly be expanded.Offshore platform steel will be the domestic steel enterprise emphasis research and development coming years and the product produced.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high performance big thickness ocean platform S355G10+N steel plate；Present invention also offers the production method of a kind of big thickness ocean platform S355G10+N steel plate.
For solving above-mentioned technical problem, the percentage by weight of steel plate chemical composition of the present invention is: C 0.08～0.12%, Si 0.15～0.50%, Mn 1.40～1.65%, P≤0.015%, S≤0.005%, V 0.040～0.060%, Nb 0.020～0.030%, Al 0.020～0.050%, Ceq≤0.43%, Pcm≤0.22%, remaining is Fe and inevitable impurity.
Steel plate thickness of the present invention is 100mm～150mm.
The inventive method includes smelting, casts, heats, rolls, cools down and heat treatment step；The percentage by weight of described steel plate chemical composition is described above.
Heating process described in the inventive method: steel ingot heats in heating furnace, less than 1000 DEG C programming rate≤120 DEG C/h, maximum heating temperature≤1240 DEG C；After coming out of the stove, Rolling from Ingot is made steel billet；Steel billet enters heating furnace heating, heating coefficient >=10min/cm, maximum heating temperature≤1240 DEG C again, and soaking zone temperature retention time is more than 90min.
Heat treatment step described in the inventive method: heating-up temperature 920 DEG C ± 10 DEG C, total heat time heating time is 2.0～2.4min/mm.
Casting operation described in the inventive method: using ingot mould cast, the degree of superheat controls at 20 DEG C～50 DEG C.
Rolling process described in the inventive method: use II type controlled rolling process, the first stage rolls between 950～1100 DEG C, and this stage reduction in pass is 25～35%, accumulative reduction ratio >=70%；Start rolling temperature≤900 DEG C of second stage, finishing temperature≤820 DEG C, accumulative reduction ratio >=30%.
Refrigerating work procedure described in the inventive method: the steel plate after rolling enters ACC and quickly cools down, red temperature 650 DEG C～700 DEG C；Then carry out stacking slow cooling, 48 hours stacking time and more than.
Use and have the beneficial effects that produced by technique scheme: the present invention takes low-carbon (LC), the mentality of designing of high microalloying on composition designs, solve carbon, manganese segregation problems and high intensity, high impact toughness and the requirement of wide cold-bending property；Under conditions of low-carbon (LC), low-carbon-equivalent, guarantee steel plate quenching degree, there is good tissue, combination property and welding performance.Mechanical performance of the present invention, welding performance, processing characteristics are good, it is possible to meet the requirement of marine engineering equipment manufacturer's construction technology condition.
The mode of production that the inventive method uses secondary to become a useful person can make steel surface bright and clean, does not has dirt, wrinkle, phosphorus skin and rust staining；May also reach up steel plate and do not allow the requirement of soldering, control plate shape and surface quality well.
The inventive method, by reasonable heat treating regime, obtains ferrite and pearlite tissue；Surface of steel plate bainite layer is few, grain size more than 8 grades, and field trash grade is at about 0.5 grade.
The inventive method product has the advantage that good mechanical performance, yield strength and tensile strength relatively thin specification performance index has bigger surplus capacity；Low-temperature impact work is high, and more than-40 DEG C of ballistic work 150 Jiao, timeliness impact more than 120J；Z-direction performance (contraction percentage of area %) is more than 50；Carbon equivalent is 0.39～0.41, and welding sensitivity coefficient is 0.19～0.21；Steel plate maximum gauge can reach 150mm.
Accompanying drawing explanation
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is the macrograph at the embodiment of the present invention 1 steel plate 1/4；
Fig. 2 is the macrograph at the embodiment of the present invention 1 steel plate 1/2.
Detailed description of the invention
This big thickness ocean platform S355G10+N steel plate employing following compositions proportioning and production method:
The percentage by weight of this steel plate chemical composition is: C 0.08～0.12%, Si 0.15～0.50%, Mn 1.40～1.65%, P≤0.015%, S≤0.005%, V 0.040～0.060%, Nb 0.020～0.030%, Al 0.020～0.050%, Ceq≤0.43%, Pcm≤0.22%, remaining is Fe and inevitable impurity.Steel plate thickness is 100～150mm.
(1) casting operation: after vacuum breaking, use the ingot mould of corresponding ingot shape to pour into a mould, it is ensured that big thickness, big substance steel plate have enough drafts and raw material of becoming a useful person, and the degree of superheat controls at 20 DEG C～50 DEG C.
(2) Heating Steel Ingots operation: steel ingot is become a useful person needs secondary to become a useful person rolling, steel ingot band temperature cleaning (>=150 DEG C), it is ensured that cleaning puts in place, it is ensured that roll rear plate quality.
Perform II group steel heating cycle, maximum heating temperature≤1240 DEG C, it is ensured that ingot blank burns uniformly thoroughly；Less than 1000 DEG C programming rate≤120 DEG C/h of steel ingot, >=1000 DEG C of programming rates do not limit.
After heating is come out of the stove, with the little tooth that hangs during tapping, folder cap mouth tapping, stop weight limit soldering；Plate surface quality requires strict, and steel ingot is strengthened water under high pressure dephosphorization after coming out of the stove and guaranteed to eliminate iron sheet, it is ensured that surface quality is good.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling；Heating coefficient >=the 10min/cm of its steel billet, maximum heating temperature≤1240 DEG C, soaking zone temperature retention time is more than 90min.
(3) rolling process: using II type controlled rolling process, first stage first stage is the austenite recrystallization stage, and rolling temperature is 950～1100 DEG C, this stage reduction in pass is 25～35%, accumulative reduction ratio >=70%, makes austenite generation perfect recrystallization, with fining austenite grains；Second stage is the austenite non-recrystallization stage, start rolling temperature≤900 DEG C, finishing temperature≤820 DEG C, within this stage, austenite crystal is elongated, high density deformation twin and deformation band is formed in the austenite of non-recrystallization in elongation, microalloy carbon, nitride are because of deformation-induced precipitation simultaneously, thus add ferritic nucleation site, have refined ferrite crystal grain, this stage reduction ratio should be tried one's best greatly, accumulative reduction ratio >=30%.
In the operation of rolling, high temperature section uses the rolling of low speed big soft reduction process, improves internal soundness, suitably increases high temperature section and fetches water number of times, reduces iron scale press-in, it is ensured that surface of steel plate is bright and clean without iron sheet.
(4) refrigerating work procedure: roll rear steel plate and enter ACC quickly cooling device and carry out on-line cooling, red temperature 650 DEG C～700 DEG C；Timely stacking slow cooling after rolling, stacking temperature 580 DEG C, stacking requires that steel plate head or shoulder align as far as possible；More than 48 hours stacking time, the time of reaching can de-stacking, turnover panel, reconditioning；Flaw detection, cooling of forbidding more than 100 DEG C to fetch water is not allowed during de-stacking steel temperature >=100 DEG C.
(5) heat treatment step: the mechanical property good in order to ensure steel plate and surface quality, is frosting in heat treatment process light plate upper and lower surface, pays close attention to steel plate following table shot-blasting quality, if shot-blasting quality does not conforms to, secondary ball blast to be carried out.Lean on panel turnover machine root when overhead traveling crane hangs steel as far as possible, prevent surface tear.Use heat-treatment furnace that steel plate is carried out normalized treatment, normalizing process: heating-up temperature 920 DEG C ± 10 DEG C, total heat time heating time: 2.0～2.4min/mm.
Embodiment 1: this big thickness ocean platform S355G10+N steel plate uses following compositions proportioning and production method.
This S355G10+N steel plate thickness is 150mm, and component content (wt) is: C 0.12%, Si 0.15%, Mn
1.63%、P 0.006%、S 0.001%、V 0.044%、Nb 0.028 %、Al
0.047%, Ceq 0.40%, Pcm 0.19%, remaining is Fe and inevitable impurity.
The production method of this steel plate is as follows: (1) casting operation: after protecting vacuum breaking, temperature is at 1548 DEG C, then uses 33.4T slab ingot mould to cast, and the degree of superheat controls at 40 DEG C.
(2) heating process: heating technique is: by II group of steel heating cycle, maximum heating temperature 1239 DEG C, steel ingot 117 DEG C/h of less than 1000 DEG C programming rates, >=1000 DEG C of programming rates do not limit.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling；The heating coefficient 10min/cm of its steel billet, maximum heating temperature 1233 DEG C, soaking zone temperature retention time 120min.
(3) rolling process: use II type controlled rolling process, the first stage rolls at 1040 DEG C, and this stage reduction in pass is 25～30%, accumulative reduction ratio 81%；Second stage start rolling temperature is 880 DEG C, and finishing temperature is 810 DEG C, accumulative reduction ratio 65%.
(4) water-cooled operation: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, and red temperature is 680 DEG C；Timely stacking slow cooling, stacking temperature 580 DEG C, 65 hours stacking time after rolling.Flaw detection, cooling of forbidding more than 100 DEG C to fetch water is not allowed during de-stacking steel temperature >=100 DEG C.
(5) heat treatment step: heating-up temperature 920 DEG C, total heat time heating time: 2.2min/mm.
This S355G10+N steel plate rolls into the macrograph of 150mm steel plate as shown in Figure 1 and Figure 2, and steel plate even tissue is tiny, and tissue grain size is at 9.0 grades, and organization type is: ferrite+pearlite, and a small amount of bainite, banded structure grade 0.5 grade.Mechanical property is: yield strength 390MPa, tensile strength 575MPa, yield tensile ratio=0.68, δ 5=29%；-40 DEG C of ballistic work AKV(are horizontal, at thickness of slab 1/2): 173,156,186J；-40 DEG C of timeliness ballistic work AKV(are horizontal, at thickness of slab 1/2): 123,146,166J；Z-direction: 55,58,56%.
Embodiment 2: this S355G10+N steel plate uses following compositions proportioning and production method.
This S355G10+N steel plate thickness is 130mm, and component content is (wt): C 0.08%, Si 0.48%, Mn
1.40%、P 0.014%、S 0.004%、V 0.060%、Nb 0.022%、Al
0.020%, Ceq 0.40%, Pcm 0.19%, remaining is Fe and inevitable impurity.
The production method of this steel plate is as follows: (1) casting process: after protecting vacuum breaking, temperature is at 1546 DEG C, then uses 31.4T slab ingot mould to cast, and the degree of superheat controls at 30 DEG C.
(2) heating technique: by II group of steel heating cycle, maximum heating temperature 1231 DEG C, it is ensured that ingot blank is grilled thoroughly uniformly；Steel ingot 109 DEG C/h of less than 1000 DEG C programming rates, >=1000 DEG C of programming rates do not limit.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling；The heating coefficient 12min/cm of its steel billet, maximum heating temperature 1233 DEG C, soaking zone temperature retention time 95min.
(3) rolling mill practice: use II type controlled rolling process, the first stage rolls at 980 DEG C, and reduction in pass is 30～35%, accumulative reduction ratio 88%；Second stage start rolling temperature is 900 DEG C, and finishing temperature is 790 DEG C, accumulative reduction ratio 62%.
(4) water-cooling process: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, and red temperature is 690 DEG C；Timely stacking slow cooling, stacking temperature 580 DEG C, 70 hours stacking time after rolling.
(5) Technology for Heating Processing: heating-up temperature 910 DEG C, total heat time heating time: 2.2min/mm.
This S355G10+N steel plate rolls into 130mm steel plate, and steel plate even tissue is tiny, and tissue grain size is at 9.5 grades, and organization type is: ferrite+pearlite, and a small amount of bainite, banded structure grade 1.0 grades.Mechanical property is: yield strength 402MPa, tensile strength 585MPa, yield tensile ratio=0.69, δ 5=31%；-40 DEG C of ballistic work AKV(are horizontal, at thickness of slab 1/2): 193,176,156J；-40 DEG C of timeliness ballistic work AKV(are horizontal, at thickness of slab 1/2): 143,136,166J；Z-direction: 52,54,51%.
Embodiment 3: this S355G10+N steel plate uses following compositions proportioning and production method.
This S355G10+N steel plate thickness is 110mm, and component content (wt) is: C 0.10%, Si 0.35%, Mn
1.55%、P 0.010%、S 0.003%、V 0.045%、Nb 0.030%、Al
0.033%, Ceq 0.40%, Pcm 0.19%, remaining is Fe and inevitable impurity.
The production method of this steel plate is as follows: (1) casting process: after protecting vacuum breaking, temperature is at 1540 DEG C, then uses 28T slab ingot mould to cast, and protects the degree of superheat and controls at 20 DEG C.
(2) heating technique: by II group of steel heating cycle, maximum heating temperature 1238 DEG C, steel ingot 112 DEG C/h of less than 1000 DEG C programming rates, >=1000 DEG C of programming rates do not limit.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling；The heating coefficient 20min/cm of its steel billet, maximum heating temperature 1223 DEG C, soaking zone temperature retention time 120min.
(3) rolling mill practice: use II type controlled rolling process, the first stage rolls at 1050 DEG C, and reduction in pass is 26～28%, accumulative reduction ratio 75%；Second stage start rolling temperature is 880 DEG C, and finishing temperature is 810 DEG C, accumulative reduction ratio 70%.
(4) water-cooling process: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, and red temperature is 670 DEG C；Timely stacking slow cooling, stacking temperature 580 DEG C, 90 hours stacking time after rolling.
(5) Technology for Heating Processing: heating-up temperature 920 DEG C, total heat time heating time: 2.2min/mm.
This S355G10+N steel plate rolls into 110mm steel plate, and steel plate even tissue is tiny, and tissue grain size is at 10.5 grades, and organization type is: ferrite+pearlite, and a small amount of bainite, banded structure grade 0 grade.Mechanical property is: yield strength 412MPa, tensile strength 590MPa, yield tensile ratio=0.70, δ 5=33%；-40 DEG C of ballistic work AKV(are horizontal, at thickness of slab 1/2): 213,226,206J；-40 DEG C of timeliness ballistic work AKV(are horizontal, at thickness of slab 1/2): 143,136,166J；Z-direction: 57,54,56%.
Embodiment 4: this S355G10+N steel plate uses following compositions proportioning and production method.
This S355G10+N steel plate thickness is 100mm, and component content (wt) is: C 0.09%, Si 0.50%, Mn
1.47%、P 0.014%、S 0.002%、V 0.040%、Nb 0.025%、Al
0.050%, Ceq 0.38%, Pcm 0.22%, remaining is Fe and inevitable impurity.
The production method of this steel plate is as follows: (1) casting process: use 28T slab ingot mould to cast, and protects the degree of superheat and controls at 50 DEG C.
(2) heating technique: by II group of steel heating cycle, maximum heating temperature 1240 DEG C, steel ingot 118 DEG C/h of less than 1000 DEG C programming rates, >=1000 DEG C of programming rates do not limit.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling；The heating coefficient 15min/cm of its steel billet, maximum heating temperature 1240 DEG C, soaking zone temperature retention time 110min.
(3) rolling mill practice: use II type controlled rolling process, the first stage rolls at 1100 DEG C, and reduction in pass is 28～32%, accumulative reduction ratio 70%；Second stage start rolling temperature is 870 DEG C, and finishing temperature is 820 DEG C, accumulative reduction ratio 80%.
(4) water-cooling process: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, and red temperature is 650 DEG C；Timely stacking slow cooling, 48 hours stacking time after rolling.
(5) Technology for Heating Processing: heating-up temperature 930 DEG C, total heat time heating time: 2.0min/mm.
This S355G10+N steel plate rolls into 100mm steel plate, and steel plate even tissue is tiny, and tissue grain size is at 10 grades, and organization type is: ferrite+pearlite, and a small amount of bainite, banded structure grade 0 grade.Mechanical property is: yield strength 402MPa, tensile strength 585MPa, yield tensile ratio=0.69, δ 5=31%；-40 DEG C of ballistic work AKV(are horizontal, at thickness of slab 1/2): 203,216,208J；-40 DEG C of timeliness ballistic work AKV(are horizontal, at thickness of slab 1/2): 153,130,146J；Z-direction: 55,56,53%.
Embodiment 5: this S355G10+N steel plate uses following compositions proportioning and production method.
This S355G10+N steel plate thickness is 125mm, and component content (wt) is: C 0.11%, Si 0.26%, Mn
1.65%、P 0.008%、S 0.005%、V 0.052%、Nb 0.020%、Al
0.029%, Ceq 0.43%, Pcm 0.20%, remaining is Fe and inevitable impurity.
The production method of this steel plate is as follows: (1) casting process: use 28T slab ingot mould to cast, and protects the degree of superheat and controls at 35 DEG C.
(2) heating technique: by II group of steel heating cycle, maximum heating temperature 1235 DEG C, steel ingot 120 DEG C/h of less than 1000 DEG C programming rates, >=1000 DEG C of programming rates do not limit.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling；The heating coefficient 14min/cm of its steel billet, maximum heating temperature 1230 DEG C, soaking zone temperature retention time 90min.
(3) rolling mill practice: use II type controlled rolling process, the first stage rolls at 950 DEG C, and reduction in pass is 30～32%, accumulative reduction ratio 85%；Second stage start rolling temperature is 850 DEG C, and finishing temperature is 780 DEG C, accumulative reduction ratio 30%.
(4) water-cooling process: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, and red temperature is 700 DEG C；Timely stacking slow cooling, 60 hours stacking time after rolling.
(5) Technology for Heating Processing: heating-up temperature 920 DEG C, total heat time heating time: 2.4min/mm.
This S355G10+N steel plate rolls into 125mm steel plate, and steel plate even tissue is tiny, and tissue grain size is at 10.5 grades, and organization type is: ferrite+pearlite, and a small amount of bainite, banded structure grade 0 grade.Mechanical property is: yield strength 416MPa, tensile strength 593MPa, yield tensile ratio=0.70, δ 5=32%；-40 DEG C of ballistic work AKV(are horizontal, at thickness of slab 1/2): 233,216,226J；-40 DEG C of timeliness ballistic work AKV(are horizontal, at thickness of slab 1/2): 153,139,172J；Z-direction: 52,55,53%.
Claims (5)
1. the production method of a big thickness ocean platform S355G10+N steel plate, it is characterised in that: it includes smelting, casts, heats, rolls, cools down and heat treatment step；The percentage by weight of described steel plate chemical composition is: C 0.08～0.12%, Si 0.15～0.50%, Mn 1.40～1.65%, P≤0.015%, S≤0.005%, V 0.040～0.060%, Nb 0.020～0.030%, Al 0.020～0.050%, Ceq≤0.43%, Pcm≤0.22%, remaining is Fe and inevitable impurity；Described heating process: steel ingot heats in heating furnace, less than 1000 DEG C programming rate≤120 DEG C/h, maximum heating temperature≤1240 DEG C；After coming out of the stove, Rolling from Ingot is made steel billet；Steel billet enters heating furnace heating, heating coefficient >=10min/cm, maximum heating temperature≤1240 DEG C again, and soaking zone temperature retention time is more than 90min.
The production method of big thickness ocean platform S355G10+N steel plate the most according to claim 1, it is characterised in that described heat treatment step: heating-up temperature 920 DEG C ± 10 DEG C, total heat time heating time is 2.0～2.4min/mm.
The production method of big thickness ocean platform S355G10+N steel plate the most according to claim 1, it is characterised in that described casting operation: using ingot mould cast, the degree of superheat controls at 20 DEG C～50 DEG C.
4. the production method of a big thickness ocean platform S355G10+N steel plate, it is characterised in that: it includes smelting, casts, heats, rolls, cools down and heat treatment step；The percentage by weight of described steel plate chemical composition is: C 0.08～0.12%, Si 0.15～0.50%, Mn 1.40～1.65%, P≤0.015%, S≤0.005%, V 0.040～0.060%, Nb 0.020～0.030%, Al 0.020～0.050%, Ceq≤0.43%, Pcm≤0.22%, remaining is Fe and inevitable impurity；Described rolling process: use II type controlled rolling process, the first stage rolls between 950～1100 DEG C, and this stage reduction in pass is 25～35%, accumulative reduction ratio >=70%；Start rolling temperature≤900 DEG C of second stage, finishing temperature≤820 DEG C, accumulative reduction ratio >=30%.
5. according to the production method of the big thickness ocean platform S355G10+N steel plate described in claim 1-4 any one, it is characterised in that described refrigerating work procedure: the steel plate after rolling enters ACC and quickly cools down, red temperature 650 DEG C～700 DEG C；Then carry out stacking slow cooling, 48 hours stacking time and more than.
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| CN102352463A (en) * | 2011-10-20 | 2012-02-15 | 南京钢铁股份有限公司 | Structural steel plate for low-crack-sensitivity offshore platform and production method thereof |
| JP5618431B2 (en) * | 2013-01-31 | 2014-11-05 | 日新製鋼株式会社 | Cold rolled steel sheet and method for producing the same |
| CN103451530B (en) * | 2013-08-29 | 2016-02-10 | 舞阳钢铁有限责任公司 | A kind of water power normalizing type heavy thickness easily welded high-strength steel plate and production method thereof |
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