CN103194677B - Steel plates for 355MPa-level easy-to-weld ocean platform and production process of steel plates - Google Patents
Steel plates for 355MPa-level easy-to-weld ocean platform and production process of steel plates Download PDFInfo
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Abstract
The invention belongs to the technical field of constructional steel for ships and ocean engineering and in particular relates to steel plates for a 355MPa-level easy-to-weld ocean platform and a production process of the steel plates. Two steel plates of which the thickness specifications are [6-40]mm and [40-60]mm are comprised, wherein the steel plate with the thickness specification of [6-40]mm comprises the following chemical components in percentage by mass: 0.10-0.15 percent of C, 0.20-0.50 percent of Si, 1.20-1.50 percent of Mn, not more than 0.015 percent of P, not more than 0.005 percent of S, 0.020-0.050 percent of Nb, 0.010-0.050 percent of V, 0.008-0.020 percent of Ti, 0.015-0.055 percent of Als, not more than 0.43 percent of Ceq, not more than 0.23 percent of Pcm and the balance of Fe and inevitable impurities; and the steel plate with the thickness specification of [40-60]mm comprises the following chemical components in percentage by mass: 0.10-0.15 percent of C, 0.20-0.50 percent of Si, 1.30-1.60 percent of Mn, not more than 0.015 percent of P, not more than 0.005 percent of S, 0.030-0.060 percent of Nb, 0.020-0.060 percent of V, 0.008-0.020 percent of Ti, 0.015-0.055 percent of Als, not more than 0.12 percent of Nb+V+Ti, not more than 0.43 percent of Ceq, not more than 0.23 percent of Pcm and the balance of Fe and inevitable impurities. According to the production method, the steel plates for the easy-to-weld ocean platform are produced by adopting low Ceq, low Pcm, Nb as well as V and Ti microalloy components and a normalizing heat treatment process and are lower in production cost, even in mechanical property and favorable in welding property.
Description
Technical field
The invention belongs to boats and ships and oceanographic engineering structure iron technical field, particularly a kind of 355MPa level easily welds offshore platform steel plate and production technique thereof.
Background technology
Along with the rapid growth of China's economic three more than ten years, domestic shipbuilding and marine engineering equipment development of manufacturing rapid.All position is at the forefront in the world for many years for accomplished shipbuilding, the newly amount of receiving orders, hand-held order volume, and marine engineering equipment production have also been obtained significant progress.Along with the development of ocean exploitation, offshore oil development moves towards deep-sea gradually, strengthens further the demand of offshore platform steel.The coming years, offshore platform steel plate demand prospect is had an optimistic view of.
The all technical of offshore platform steel plate requires high, must have the performances such as high strength, high tenacity, antifatigue, anti-lamellar tearing, good weldability, seawater corrosion resistance and good cold-workability.Current international ocean Platform Steel plate Major grades is 355,420,460MPa.The main trade mark of 355 MPa level: the 350EM of API2H-50, BS7191 of S355, API of En10225, ship target E36; The main trade mark of 420 MPa level: the API2Y-60 of S420, API of En10225, ship target E40, E420; The main trade mark of 460 MPa level: the S460 of En10225, ship target E460.Oneself warp of domestic offshore platform steel plate is extensive to be adopted, and below EH36 rank realizes production domesticization substantially, accounts for 90% of Platform Steel amount, but key position heavy thickness used, High Strength Steel still dependence on import.Along with offshore platform structure keeps the large-scale development, required steel plate thickness increases thereupon, has higher requirement to the performance of offshore platform steel plate.
In this context, be badly in need of the R&D and promotion carrying out high-performance marine Platform Steel plate, the offshore platform steel plate of especially Devoting Major Efforts To Developing high strength, high tenacity, anti-lamellar tearing, easily welding.
Therefore application number be 201210564686.8 application discloses a kind of 355MPa level low welding crack sensitivity steel plate, its chemical composition mass percent is: C 0.09 ~ 0.13%, Si 0.25 ~ 0.35%, Mn 1.20 ~ 1.50%, P≤0.015%, S≤0.005%, Al 0.025 ~ 0.04%, Nb 0.02 ~ 0.05%, Ti 0.01 ~ 0.03%, Cu 0.10 ~ 0.3%, Ni 0.10 ~ 0.3%, all the other are Fe and inevitable impurity; Adopt top and bottom combined blown converter smelting, and adopt the low nickel pig iron to join nickel; Continuously cast bloom type thickness specification is 400mm, and width is at 1800 ~ 2400mm; Steel plate adopts two-stage control rolling+controlled cooling model+normalizing treatment, and above-mentioned patent with the addition of Cu and Ni, in steel, add Cu, and easily make strand and surface of steel plate produce star-like crack, and the price of Ni alloy is more expensive, cost is higher, does not have cost advantage.
And application number be 201110358089.5 application discloses the manufacture method that a kind of welding crack sensibility index is less than the 355MPa level low alloy steel plate of 0.23, the chemical component weight per-cent span of control of this steel plate: C: 0.10 ~ 0.13, Mn: 1.45 ~ 1.53, Si: 0.20 ~ 0.30, Nb: 0.030 ~ 0.040, V: 0.060 ~ 0.070, Ti: 0.005 ~ 0.015, Al: 0.020 ~ 0.050, P :≤0.013, S :≤0.003%, all the other are Fe and inevitable impurity; And the chemical composition of this steel plate meets welding crack sensibility indices P cm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B≤0.23 by weight percentage, but above-mentioned patent application with the addition of more V, according to alum space consulting investigation on the net, the price of V is floated at 85000 yuan/ton, cost is higher, and in the making method of above-mentioned patent, thermal treatment process is actual is modified, and step is more, thus further increase cost, be unfavorable for scale operation.
Summary of the invention
For above deficiency, the invention provides a kind of 355MPa level and easily weld offshore platform steel plate and production technique thereof, this steel plate adopts Nb, V, Ti microalloy composition, by low-carbon-equivalent Ceq, low-welding crack-sensitive indices P cm and normalizing heat treatment technique, produce easily welding offshore platform steel plate, production cost is lower, and mechanical property is even, and welding property is good.
The present invention is achieved by the following technical solutions: a kind of 355MPa level easily welds offshore platform steel plate, it comprise thickness specification for [6 ~ 40] mm with (40 ~ 60] mm two kinds,
The steel plate chemical composition mass percent of described thickness specification [6 ~ 40] mm is: C:0.10 ~ 0.15%, Si:0.20 ~ 0.50%, Mn:1.20 ~ 1.50%, P :≤0.015%, S :≤0.005%, Nb:0.020 ~ 0.050%, V:0.010 ~ 0.050%, Ti:0.008 ~ 0.020%, Als:0.015 ~ 0.055%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity;
Described thickness specification be (40 ~ 60] the steel plate chemical composition mass percent of mm is: C:0.10 ~ 0.15%, Si:0.20 ~ 0.50%, Mn:1.30 ~ 1.60%, P :≤0.015%, S :≤0.005%, Nb:0.030 ~ 0.060%, V:0.020 ~ 0.060%, Ti:0.008 ~ 0.020%, Als:0.015 ~ 0.055%, Nb+V+Ti≤0.12%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity.
When described steel plate thickness specification is 36mm, steel plate chemical composition mass percent is: C:0.12%, Si:0.23%, Mn:1.44%, P:0.014%, S:0.003%, Nb:0.034%, V:0.020%, Ti:0.015%, Als:0.032%, Ceq:0.37, Pcm:0.21%, surplus is Fe and inevitable impurity.
When described steel plate thickness specification is 60mm, steel plate chemical composition mass percent is: C:0.12%, Si:0.26%, Mn:1.47%, P:0.015%, S:0.004%, Nb:0.042%, V:0.030%, Ti:0.019%, Als:0.029%, Ceq:0.38, Pcm:0.21%, surplus is Fe and inevitable impurity.
Steel plate of the present invention, its manufacturing process steps is:
Blast-melted → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refining → RH refining → sheet billet continuous casting → slab stacking slow cooling → slab cleaning → slab that rolls off the production line reheats → 4300 mill millings → Mulpic cooling → steel plate stacking slow cooling → flaw detection → normalizing → finished product inspection by sampling → warehouse-in.
When the thickness specification of steel plate is [6 ~ 40] mm, its processing condition are:
(1) molten iron pre-desulfurization, enter stove molten iron S≤0.003%, by C:0.10 ~ 0.15%, Si:0.20 ~ 0.50%, Mn:1.20 ~ 1.50%, P :≤0.015%, S :≤0.005%, Nb:0.020 ~ 0.050%, V:0.010 ~ 0.050%, Ti:0.008 ~ 0.020%, Als:0.015 ~ 0.055%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity smelting molten steel, molten steel through LF, RH refining, [N]≤30ppm, [O]≤25ppm, [H]≤1.5ppm, becomes 250mm heavy slab by molten steel casting, roll off the production line stacking slow cooling;
(2) slab inspection cleaning after shove charge heating, heat-up time 0.9 ~ 1.0min/mm, tapping temperature 1100 ~ 1180 DEG C;
(3) slab is through high-pressure water descaling, and high-pressure water pressure is 19 ~ 20Mpa, enters 4300mm mill milling;
(4) rough rolling step improves reduction in pass, ensures more than 2 reduction in pass > 25mm; The thickness of workpiece thickness >=2.5 times finished steel plate;
(5) finish rolling ensures finishing temperature: steel plate finishing temperature control is at 840 ± 10 DEG C;
(6) normalizing treatment temperature: 900 ± 10 DEG C; Soaking time: 1.5min/mm+10min.
More specifically, when the thickness specification of steel plate is 36mm, its processing condition are:
(1) molten iron pre-desulfurization, enters stove molten iron S≤0.003%, by C:0.12%, Si:0.23%, Mn:1.44%, P:0.014%, S:0.003%, Nb:0.034%, V:0.020%, Ti:0.015%, Als:0.032%, Ceq:0.37, Pcm:0.21%, surplus is Fe and inevitable impurity smelting molten steel, molten steel through LF, RH refining, [N]≤30ppm, [O]≤25ppm, [H]≤1.5ppm, becomes 250mm heavy slab by molten steel casting, roll off the production line stacking slow cooling;
(2) slab inspection cleaning after shove charge heating, heat-up time 235min, tapping temperature 1160 DEG C;
(3) slab is through high-pressure water descaling, and high-pressure water pressure is 19Mpa, enters 4300mm mill milling;
(4) rough rolling step improves reduction in pass, ensures more than 2 reduction in pass > 25mm; The thickness of workpiece thickness >=2.5 times finished steel plate;
(5) finish rolling ensures finishing temperature: steel plate finishing temperature 843 DEG C;
(6) normalizing treatment temperature: 902 DEG C; Soaking time: 64min.
When the thickness specification of steel plate be (40 ~ 60] mm time, its processing condition are:
(1) molten iron pre-desulfurization, enter stove molten iron S≤0.003%, by C:0.10 ~ 0.15%, Si:0.20 ~ 0.50%, Mn:1.30 ~ 1.60%, P :≤0.015%, S :≤0.005%, Nb:0.030 ~ 0.060%, V:0.020 ~ 0.060%, Ti:0.008 ~ 0.020%, Als:0.015 ~ 0.055%, Nb+V+Ti≤0.12%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity smelting molten steel, molten steel is through LF, RH refining, [N]≤30ppm, [O]≤25ppm, [H]≤1.5ppm, molten steel casting is become 250mm heavy slab, roll off the production line stacking slow cooling,
(2) slab inspection cleaning after shove charge heating, heat-up time 0.9 ~ 1.0min/mm, tapping temperature 1100 ~ 1180 DEG C;
(3) slab is through high-pressure water descaling, and high-pressure water pressure is 19 ~ 20Mpa, enters 4300mm mill milling;
(4) rough rolling step improves reduction in pass, ensures more than 2 reduction in pass > 25mm; The thickness of workpiece thickness >=2.5 times finished steel plate;
(5) finish rolling ensures finishing temperature: steel plate finishing temperature control is at 820 ± 10 DEG C;
(6) normalizing treatment temperature: 900 ± 10 DEG C; Soaking time: 1.5min/mm+10min.
More specifically, when the thickness specification of steel plate is 60mm, its processing condition are:
(1) molten iron pre-desulfurization, enters stove molten iron S≤0.003%, by C:0.12%, Si:0.26%, Mn:1.47%, P:0.015%, S:0.004%, Nb:0.042%, V:0.030%, Ti:0.019%, Als:0.029%, Ceq:0.38, Pcm:0.21%, surplus is Fe and inevitable impurity smelting molten steel, molten steel through LF, RH refining, [N]≤30ppm, [O]≤25ppm, [H]≤1.5ppm, becomes 250mm heavy slab by molten steel casting, roll off the production line stacking slow cooling;
(2) slab inspection cleaning after shove charge heating, heat-up time 238min, tapping temperature 1165 DEG C;
(3) slab is through high-pressure water descaling, and high-pressure water pressure is 20Mpa, enters 4300mm mill milling;
(4) rough rolling step improves reduction in pass, ensures more than 2 reduction in pass > 25mm; The thickness of workpiece thickness >=2.5 times finished steel plate;
(5) finish rolling ensures finishing temperature: steel plate finishing temperature control is at 818 DEG C;
(6) normalizing treatment temperature: 900 DEG C; Soaking time: 100min.
The 355MPa level offshore platform steel plate that the present invention produces, producible maximum ga(u)ge is 60mm, this steel plate does not adopt traditional Cu and Ni, but adopt Nb, V, Ti microalloy composition, and the usage quantity of V reduces greatly, by low-carbon-equivalent Ceq, low-welding crack-sensitive indices P cm and normalizing heat treatment technique, greatly reduce production cost, and even mechanical property can be ensured: lower yield strength 370 ~ 430MPa, tensile strength 515 ~ 575MPa, elongation after fracture 25 ~ 35%,-20 DEG C of Charpy impact energies are longitudinally average at more than 160J, Z-direction Tensile fracture shrinking percentage is on average more than 45%, and welding property is good, under the condition ensureing mechanical property and welding property, the present invention greatly reduces production cost, be conducive to the development of the industry.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described, so that those skilled in the art better can understand the present invention, but therefore do not limit the present invention.
Technical process of the present invention is: blast-melted → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refining → RH refining → sheet billet continuous casting → slab stacking slow cooling → slab cleaning → slab that rolls off the production line reheats → 4300 mill millings → Mulpic cooling → steel plate stacking slow cooling → flaw detection → normalizing → finished product inspection by sampling → warehouse-in.
According to chemical composition ranges provided by the invention, according to the processing condition of above-mentioned technical process and regulation, smelting molten steel in 210 tons of converters, becomes 250mm heavy slab by molten steel casting, rolling 36 respectively, 60mm steel plate on 4300mm wide and heavy plate mill.
The chemical composition of steel plate is in table 1; Heating, normalizing process parameter are in table 2; Rolling technological parameter is in table 3; The behavior pattern of steel plate is in table 4; Test piece for welding test-results is in table 5.
Known according to table 4 and table 5, when production cost reduces, lower yield strength 370 ~ 430MPa of the present invention, tensile strength 515 ~ 575MPa, elongation after fracture 25 ~ 35%,-20 DEG C of Charpy impact energies are longitudinally average at more than 160J, and Z-direction Tensile fracture shrinking percentage is on average more than 45%, and welding property is good.
Claims (5)
1. 355MPa level easily welds an offshore platform steel plate, described steel plate comprise thickness specification for [6 ~ 40] mm with (40 ~ 60] mm two kinds,
The steel plate chemical composition mass percent of described thickness specification [6 ~ 40] mm is: C:0.10 ~ 0.15%, Si:0.20 ~ 0.50%, Mn:1.20 ~ 1.50%, P :≤0.015%, S :≤0.005%, Nb:0.020 ~ 0.050%, V:0.010 ~ 0.050%, Ti:0.008 ~ 0.020%, Als:0.015 ~ 0.055%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity;
Described thickness specification be (40 ~ 60] the steel plate chemical composition mass percent of mm is: C:0.10 ~ 0.15%, Si:0.20 ~ 0.50%, Mn:1.30 ~ 1.60%, P :≤0.015%, S :≤0.005%, Nb:0.030 ~ 0.060%, V:0.020 ~ 0.060%, Ti:0.008 ~ 0.020%, Als:0.015 ~ 0.055%, Nb+V+Ti≤0.12%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity;
When the thickness specification of steel plate is [6 ~ 40] mm, its processing condition of producing are:
(1) molten iron pre-desulfurization, enter stove molten iron S≤0.003%, by C:0.10 ~ 0.15%, Si:0.20 ~ 0.50%, Mn:1.20 ~ 1.50%, P :≤0.015%, S :≤0.005%, Nb:0.020 ~ 0.050%, V:0.010 ~ 0.050%, Ti:0.008 ~ 0.020%, Als:0.015 ~ 0.055%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity smelting molten steel, molten steel through LF, RH refining, [N]≤30ppm, [O]≤25ppm, [H]≤1.5ppm, becomes 250mm heavy slab by molten steel casting, roll off the production line stacking slow cooling;
(2) slab inspection cleaning after shove charge heating, heat-up time 0.9 ~ 1.0min/mm, tapping temperature 1100 ~ 1180 DEG C;
(3) slab is through high-pressure water descaling, and high-pressure water pressure is 19 ~ 20Mpa, enters 4300mm mill milling;
(4) rough rolling step improves reduction in pass, ensures more than 2 reduction in pass > 25mm; The thickness of workpiece thickness >=2.5 times finished steel plate;
(5) finish rolling ensures finishing temperature: steel plate finishing temperature control is at 840 ± 10 DEG C;
(6) normalizing treatment temperature: 900 ± 10 DEG C; Soaking time: 1.5min/mm+10min;
When the thickness specification of steel plate be (40 ~ 60] mm time, its produce processing condition be:
(1) molten iron pre-desulfurization, enter stove molten iron S≤0.003%, by C:0.10 ~ 0.15%, Si:0.20 ~ 0.50%, Mn:1.30 ~ 1.60%, P :≤0.015%, S :≤0.005%, Nb:0.030 ~ 0.060%, V:0.020 ~ 0.060%, Ti:0.008 ~ 0.020%, Als:0.015 ~ 0.055%, Nb+V+Ti≤0.12%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity smelting molten steel, molten steel is through LF, RH refining, [N]≤30ppm, [O]≤25ppm, [H]≤1.5ppm, molten steel casting is become 250mm heavy slab, roll off the production line stacking slow cooling,
(2) slab inspection cleaning after shove charge heating, heat-up time 0.9 ~ 1.0min/mm, tapping temperature 1100 ~ 1180 DEG C;
(3) slab is through high-pressure water descaling, and high-pressure water pressure is 19 ~ 20Mpa, enters 4300mm mill milling;
(4) rough rolling step improves reduction in pass, ensures more than 2 reduction in pass > 25mm; The thickness of workpiece thickness >=2.5 times finished steel plate;
(5) finish rolling ensures finishing temperature: steel plate finishing temperature control is at 820 ± 10 DEG C;
Normalizing treatment temperature: 900 ± 10 DEG C; Soaking time: 1.5min/mm+10min.
2. a kind of 355MPa level according to claim 1 easily welds offshore platform steel plate, it is characterized in that: when described steel plate thickness specification is 36mm, steel plate chemical composition mass percent is: C:0.12%, Si:0.23%, Mn:1.44%, P:0.014%, S:0.003%, Nb:0.034%, V:0.020%, Ti:0.015%, Als:0.032%, Ceq:0.37, Pcm:0.21%, surplus is Fe and inevitable impurity.
3. a kind of 355MPa level according to claim 1 easily welds offshore platform steel plate, it is characterized in that: when described steel plate thickness specification is 60mm, steel plate chemical composition mass percent is: C:0.12%, Si:0.26%, Mn:1.47%, P:0.015%, S:0.004%, Nb:0.042%, V:0.030%, Ti:0.019%, Als:0.029%, Ceq:0.38, Pcm:0.21%, surplus is Fe and inevitable impurity.
4. a kind of 355MPa level according to claim 1 easily welds the production technique of offshore platform steel plate, it is characterized in that, when the thickness specification of steel plate is 36mm, its processing condition are:
(1) molten iron pre-desulfurization, enters stove molten iron S≤0.003%, by C:0.12%, Si:0.23%, Mn:1.44%, P:0.014%, S:0.003%, Nb:0.034%, V:0.020%, Ti:0.015%, Als:0.032%, Ceq:0.37, Pcm:0.21%, surplus is Fe and inevitable impurity smelting molten steel, molten steel through LF, RH refining, [N]≤30ppm, [O]≤25ppm, [H]≤1.5ppm, becomes 250mm heavy slab by molten steel casting, roll off the production line stacking slow cooling;
(2) slab inspection cleaning after shove charge heating, heat-up time 235min, tapping temperature 1160 DEG C;
(3) slab is through high-pressure water descaling, and high-pressure water pressure is 19Mpa, enters 4300mm mill milling;
(4) rough rolling step improves reduction in pass, ensures more than 2 reduction in pass > 25mm; The thickness of workpiece thickness >=2.5 times finished steel plate;
(5) finish rolling ensures finishing temperature: steel plate finishing temperature 843 DEG C;
(6) normalizing treatment temperature: 902 DEG C; Soaking time: 64min.
5. a kind of 355MPa level according to claim 1 easily welds the production technique of offshore platform steel plate, it is characterized in that, when the thickness specification of steel plate is 60mm, its processing condition are:
(1) molten iron pre-desulfurization, enters stove molten iron S≤0.003%, by C:0.12%, Si:0.26%, Mn:1.47%, P:0.015%, S:0.004%, Nb:0.042%, V:0.030%, Ti:0.019%, Als:0.029%, Ceq:0.38, Pcm:0.21%, surplus is Fe and inevitable impurity smelting molten steel, molten steel through LF, RH refining, [N]≤30ppm, [O]≤25ppm, [H]≤1.5ppm, becomes 250mm heavy slab by molten steel casting, roll off the production line stacking slow cooling;
(2) slab inspection cleaning after shove charge heating, heat-up time 238min, tapping temperature 1165 DEG C;
(3) slab is through high-pressure water descaling, and high-pressure water pressure is 20Mpa, enters 4300mm mill milling;
(4) rough rolling step improves reduction in pass, ensures more than 2 reduction in pass > 25mm; The thickness of workpiece thickness >=2.5 times finished steel plate;
(5) finish rolling ensures finishing temperature: steel plate finishing temperature control is at 818 DEG C;
(6) normalizing treatment temperature: 900 DEG C; Soaking time: 100min.
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| CN102605293A (en) * | 2012-04-18 | 2012-07-25 | 江苏省沙钢钢铁研究院有限公司 | Non-quenched and tempered low-crack sensitivity steel plate with excellent low-temperature toughness, and production method thereof |
| CN103014498A (en) * | 2012-12-21 | 2013-04-03 | 首钢总公司 | 355MPa low-welding-crack-sensitivity steel plate and producing method |
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| CN103194677A (en) | 2013-07-10 |
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