CN102534383A - High-tenacity steel plate for ocean engineering and manufacturing method thereof - Google Patents
High-tenacity steel plate for ocean engineering and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a high-tenacity steel plate for ocean engineering and a manufacturing method thereof, belonging to the technical field of steel for ocean engineering. The high-tenacity steel plate comprises the following chemical compositions according to percentages by weight: 0.03-0.08% of C, 0.10-0.30% of Si, 1.0-1.60% of Mn, 0.03-0.04% of Alt, 0.03-0.06% of Nb, 0.05-0.09% of V, 0.010-0.02% of Ti, 0.1-0.4% of Mo, 0.1-0.4% of Ni, 0.1-0.4% of Cu, less than 0.01% of P, less than 0.005% of S, less than or equal to 0.12% of Nb+V+Ti, the rest of Fe and inevitable impurities. The low-temperature tenacity of the steel plate is ensured by adding few Ni and adopting a reasonable controlled rolling and cooling technology, thereby a thermal treatment technology is omitted, and the production cost is reduced; the obtained steel plate with 10-50mm has good strong plasticity, weldability and anti-lamellar tearing performance and excellent comprehensive mechanical performance such as drop weight and the like; and the high-tenacity steel plate is simple in technology and can be widely applied to key positions of permanent, self-elevating and semi-submersible type ocean platforms.
Description
Technical field
The invention belongs to oceanographic engineering and use the steel technical field, particularly relate to a kind of H.T. oceanographic engineering with steel plate and method of manufacture thereof, cost is low, plasticity is strong, weldableness, anti-lamellar tearing and comprehensive mechanical property such as drop hammer are good.
Background technology
Along with China constantly increases the demand of Nonrenewable resources such as oil, the ocean becomes the hope place of satisfying petroleum demand.The ocean exploitation process is constantly accelerated, and marine oil and gas already is a dark horse, and average growth rate per annum reaches 32.3%, shoots up to be the mainstay industry of Chinese marine economy.Marine oil is the emphasis of 20 years energy strategies of Future in China.
Because natural petroleum gas field is advanced until the cold zone of temperature at-40～-60 ℃ to the shallow sea by land, withstands the effect of impact of drifts such as ice cube for guaranteeing ocean platform, requires offshore platform structure to have good low-temperature flexibility with steel.And high-grade ocean platforms such as SEP and semisubmersible platform are increasing with the demand of steel to the strong oceanographic engineering of superelevation; When the spud leg of SEP adopted the low level steel plate to cause spud leg to rise easily, center of gravity improved, the reduction of platform stable property; Therefore be necessary to improve intensity; Alleviate the weight of spud leg, lower the center of gravity, guarantee platform safety.
Ocean platform is a large welded structures equipment, and the weld is many, and the welding property quality directly has influence on welding efficiency.Improve weld heat input, the release postweld heat treatment is for the manufacturing cycle that shortens ocean platform and reduce cost significant.Ocean platform has good anti-lamellar tearing performance with steel required thickness direction; And lamellar tearing has no sign in appearance, and existing nondestructiving detecting means is difficult to again find that promptly enabling to judge has lamellar tearing in the structure; Also be difficult to repair, cause enormous economic loss.Therefore, guarantee that it is necessary that ocean platform has good anti-lamellar tearing performance with steel.Researching and developing low-cost H.T. ocean platform has important practical significance with slab.
Publication number is the working method of low-carbon (LC) and ULCB high-strength steel for the CN1218115A patent of invention proposes copper boron, is merely 6-16mm but its thickness is low, does not study performances such as welding property.
Publication number proposes to have the high-strength steel and the method for manufacture thereof of high welding heat influence area toughness for the CN101165202A patent of invention, and its production technique is the TMCP+ tempering process, has increased production process, and cost increases.
Publication number proposes a kind of ultrafine crystal bainite high-strength steel and method of manufacture thereof for the CN101812642A patent of invention, and its intensity is higher, reaches 690MPa, but low-temperature flexibility is lower, only can satisfy-20 ℃, does not study the lamellar tearing performance.
Publication number is that CN101818304A and CN101255528A patent of invention propose the niobium-containing steel plate that a kind of ultra-large linear energy input welding high-strength steel reaches and ultralow-temperature flexibility is excellent, but its ys is respectively 460MPa and 480MPa, and intensity rank is lower.
Publication number is that the patent intensity rank that CN101984119A and CN101845597 patent of invention propose reaches 690MPa, but that its production technique is is modified, and thermal treatment process has increased production cost.
Publication number has proposed to adopt the plate steel of TMCP explained hereafter superstrength and low-temperature impact toughness for the CN101781742A patent of invention, and its technology is simple, and intensity rank reaches 550MPa;-60 ℃ of impacts are greater than 37J; But it has added the Cr element, and cost increases, and its thickness is 18～40mm; Thinner thickness, the performance that oceanographic engineerings such as not research welding, anti-lamellar tearing need with steel.
That publication number proposes generous intensity deck of boat steel with a high standard for the CN101418417A patent of invention and production technique, but its intensity rank is lower, is 390MPa.
Publication number proposes to have the deck of boat steel and the preparation method of superstrength and impelling strength for the CN101705434A patent of invention; The steel plate ys is 620MPa; Tensile strength is 720-890MPa;-60 ℃ of ballistic works are greater than 41J, but its Cu, Cr, Mo, Ni content is higher and adopt and quench and tempering process, and cost is higher.
Publication number is that CN101906591A and CN101775559A patent of invention propose a kind of ultra high strength ship plate steel and working method thereof.Its Re＞550MPa, Rm＞670MPa, elongation＞20% ,-60 ℃ of ballistic work＞60J or 200J, Z is to relative reduction in area＞35%, but it adopts the TMCP+ tempering process, and Cu, Cr, Mo, Ni content are higher, and production cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of H.T. oceanographic engineering with steel plate and method of manufacture thereof, the thickness range 10-50mm of steel plate; The oceanographic engineering that adopts the TMCP Technology to produce high-intensity high-tenacity, is prone to welding and has a good resistance lamellar tearing performance is used steel, has satisfied present home market to the demand of high-grade maritime works with steel.
Oceanographic engineering of the present invention uses the composition weight percentage of steel plate to be: C 0.03-0.08%, Si0.10-0.30%, Mn1.0-1.60%, Alt0.03-0.04%; Nb0.03-0.06%, V0.05-0.09%, Ti0.010-0.02%, Mo0.1-0.4%; Ni0.1-0.4%, Cu0.1-0.4%, P＜0.01%; S＜0.005%, Nb+V+Ti≤0.12%, all the other are Fe and inevitable impurity.
Adopt wide strand as far as possible, reduce broadening than (broadening is than≤1.6), strict control final cooling temperature, producing steel plate thickness specification is 10～50mm, the steel plate microtexture is granular ferrite, acicular ferrite and a small amount of perlite.
Performance index are: ys >=500MPa, and tensile strength 610-770MPa, unit elongation >=18%, the conventional ballistic work average >=100J of-60 ℃ 1/4 place and heart portion ,-40 ℃ of timeliness ballistic works surpass the steel plate of 200J, and Z surpasses 35% to relative reduction in area.
The composition design feature: strict control molten steel purity, reduce the disadvantageous effect of impurity element to mechanical property, guarantee that P is lower than 0.01%, S is lower than 0.005%; Strict control strand internal soundness; Require strand macroscopic examination center segregation to be lower than C class 1.0, with steel low-temperature flexibility is had relatively high expectations, adopt the composition design of low-carbon (LC) and low-carbon-equivalent to oceanographic engineering; C content is controlled at below 0.06%, on raising flexible basis, guarantees welding property; Add little amount of N i and further improve low-temperature flexibility, utilize the refined crystalline strengthening of microalloy element Nb, V, Ti and the solution strengthening effect of precipitation strength effect and Mn to improve intensity, remedy the insufficient problem of armor plate strength that low-carbon (LC) causes; Add the Mo element and suppress ferrite transformation, promote the acicular ferrite phase transformation, guarantee obdurability.
Wherein, the effect in the present invention of each chemical ingredients and content is:
C 0.03-0.08%: carbon is the principal element in the steel, and the strong plasticity of steel plate, toughness and welding property are had a direct impact.Improve carbon content and cause intensity to increase and low-temperature flexibility decline easily, property of welded joint reduces, and carbon content is crossed the low difficulty that then causes smelting, and controlling difficulty increases, and also is beneficial to armor plate strength and meets the demands.For guaranteeing the heart portion low-temperature flexibility of thick steel plates, carbon content is decided to be 0.03-0.08%.
Si 0.10-0.30%: silicon is the bioelement of deoxidation in steel making, and its effect is that strongly inhibited is decomposed with the carbide that delays supercooled austenite, improves stabilization of austenite, promotes acicular ferrite, improves armor plate strength, crosses the low low-temperature flexibility that then influences.
Mn 1.0-1.60%: manganese with low cost, can increase the obdurability and the hardness of steel, be the element of strong stable austenite.Help guaranteeing the intensity of steel plate through the solution strengthening effect of Mn, improve the welded heat affecting zone tissue.
P≤0.01%, S≤0.005%: because p and s is a harmful element in the steel, to plasticity, low-temperature flexibility and welding property deleterious impact.For guaranteeing the comprehensive mechanical property of steel plate, strict control S, P content are lower than certain level.
Nb0.03-0.06%:Nb is as one of important microalloy element; In the controlled rolling process, dissolve particle and stop AUSTENITE GRAIN COARSENING when heating; Nb strain inducing on dislocation, subgrain boundary, crystal boundary is separated out carbonitride, has suppressed austenitic recrystallize, and recrystallization process is carried out in the high-temperature zone; Strengthened the TR in non-recrystallization district on the other hand; Thereby realized that high-temperature control is rolling; Reduced rolling load, before phase transformation, austenite carried out the distortion accumulation of multi-pass, for the refinement ferrite crystal grain creates conditions; Final strong plasticity and the low-temperature flexibility that guarantees steel plate, and the precipitate of small and dispersed helps improving armor plate strength.
V0.05-0.09%: microalloy element V helps improving armor plate strength with the cooled tiny precipitate of laminar flow in the laminar flow process of cooling, and lower to the disadvantageous effect of low-temperature flexibility.
Ti0.010-0.02%: the TiN that the Ti of trace separates out after solidifying is comparatively tiny, and the heating phase can effectively stop austenite crystal to be grown up, and helps guaranteeing that austenite crystal is tiny evenly.The nitride particles of Ti can suppress the welded heat affecting zone grain growth, improves the low-temperature flexibility of welding joint.Ti is controlled at 0.010-0.02%, too high Ti infringement welding property.
The interpolation of Mo0.1-0.4%:Mo has suppressed the polygonal ferrite phase transformation, and what guarantee steel plate finally is organized as acicular ferrite, helps improving intensity.
Ni0.1-0.4%:Ni can reduce the dislocation motion resistance, makes stress relaxation, improves the low-temperature flexibility of steel.Ni is stronger to polygonal ferrite phase transformation restraining effect, and M/A island content increases, and improves armor plate strength, and in addition, Ni can prevent to contain in the Cu strand heating rolling process and crack.
The disperse precipitate of Cu0.1-0.4%:Cu on dislocation, crystal boundary and subgrain boundary helps improving the intensity of steel plate, and Cu can improve the steel plate corrosion resistance nature to a certain extent.
Working method of the present invention comprises high clean smelting steel-desulfurizing iron-converter top bottom blowing-vacuum-treat-strand-slab heating-rolling-water-cooled; The technical parameter of in the technology of slab heating-roughing-finish rolling, controlling is following:
1, the slab heating phase; For microalloy element is fully dissolved, guarantee certain autstenitic grain size simultaneously, steel billet is heated to 1150～1200 ℃; Guarantee steel billet time inside furnace 250～400min, not only guaranteed that the steel billet heating fully but also suppress austenite crystal and too grow up;
2, rolling rolling in two stages, promptly the recrystallization zone is rolling rolling with the non-recrystallization district; 950～1100 ℃ of recrystallization zone rolling sequence start rolling temperatures; Recrystallization zone rolling pass draft guarantees that at least two passages stablize 20～35%; The centre treats that temperature thickness is controlled at 2.0～4.0 times of finished product thickness, control non-recrystallization district start rolling temperature≤910 ℃, and finishing temperature is at 790～840 ℃.The recrystallize rolling sequence adopts high temperature low speed to depress greatly, guarantees that at least two passage drafts are 20～35%, guarantees that the crystal grain of steel plate heart portion is fined, and what help organizing on the steel plate thickness direction is even;
3, water-cooling process: for guaranteeing to roll back armor plate strength and plate shape, strict control laminar flow refrigerative final cooling temperature and speed of cooling; Temperature is crossed low influence template, the too high armor plate strength that then influences; To the different thickness specification, final cooling temperature is controlled to be 400～600 ℃, and speed of cooling is controlled at 10～15 ℃/s;
The production technique advantage is: select big width strand for use, improve recrystallization zone rolling sequence draft, guarantee that at least two passage drafts are 20～35%, guarantee anti-lamellar tearing performance and low-temperature flexibility; Rationally the control cooling controlling and rolling controlling process guarantees armor plate strength and low-temperature flexibility; Improve water-cooled speed, reduce final cooling temperature, guarantee the precipitated phase of acicular ferrite phase transformation and small and dispersed; Reach the purpose of refined crystalline strengthening and precipitation strength; But final cooling temperature should not be low excessively, otherwise cause plate shape bad easily, influences product percent of pass.
The steel plate that the present invention produces is compared than the ad eundem steel plate, and strict control carbon content is added little amount of N i; Alloying element is few, omits thermal treatment process, and cost is lower; Be suitable for industrialized production, feasibility is stronger, and comprehensive mechanical property satisfies oceanographic engineering with the requirement of steel to each item mechanical property: ys >=500MPa; Tensile strength 610-770MPa, unit elongation >=18%, the conventional ballistic work average >=100J of-60 ℃ 1/4 place and heart portion;-40 ℃ of timeliness ballistic works surpass the steel plate of 200J, and Z surpasses 35% to relative reduction in area, and steel plate has high-intensity high-tenacity and anti-lamellar tearing performance; When weld heat input was 50kJ/cm, the low-temperature flexibility of welding joint weld seam, welded bonds and welded bonds+2mm, welded bonds+5mm and welded bonds+20mm was good.
Description of drawings
Fig. 1 is 30mm Plate Steel rolling procedure figure.
Fig. 2 is the surperficial micro-organization chart in 30mm Plate Steel transverse section.
Fig. 3 is 30mm Plate Steel transverse section 1/4 a position micro-organization chart.
Fig. 4 is the micro-organization chart of heart portion in 30mm Plate Steel transverse section.
Fig. 5 is the reduction schedule figure of 30mm Plate Steel.
Fig. 6 is the surperficial micro-organization chart in 50mm Plate Steel transverse section.
Fig. 7 is 50mm Plate Steel transverse section 1/4 a position micro-organization chart.
Fig. 8 is the micro-organization chart of heart portion in 50mm Plate Steel transverse section.
Fig. 9 is the experimental result of dropping hammer of 50mm steel plate-50 ℃.
Figure 10 is a 50mm Plate Steel ductile-brittle transition temperature curve.
Embodiment
Following specific examples is explained technical scheme of the present invention, but protection scope of the present invention is not limited thereto:
The low-cost high-strength oceanographic engineering is with steel plate thickness 30mm, and its chemical ingredients consists of: C 0.04%, Si0.24%, Mn1.52%; Alt0.034%, Nb0.048%, V0.052%, Ti0.015%; Mo0.33%, Ni0.3%, Cu0.21%; P0.01%, S0.0029%, all the other are iron Fe and unavoidable impurities.Billet size is 300*2400*2700mm, and plate size is 30*2600*24900mm, and strand macroscopic examination center segregation is a C class 0.5, and table 1 is the cooling controlling and rolling controlling process parameter under this composition, and table 2 is the mechanical properties that under this processing parameter, obtain.Table 3 steel plate timeliness impact property and Z are to performance.Accompanying drawing 1 is a 30mm Plate Steel rolling procedure, and accompanying drawing 2, accompanying drawing 3 and accompanying drawing 4 are the microstructure of 30mm Plate Steel.Can find out that steel plate is organized mainly and formed with granular ferrite, acicular ferrite and a small amount of perlite, and microstructure difference on thickness direction is little.
Table 1 rolling technological parameter
| Thickness of slab/mm | Slab heating temperature/℃ | Start rolling temperature/℃ | The finish rolling start rolling temperature/℃ | Finishing temperature/℃ | Final cooling temperature/ |
| 30 | 1200 | 1079 | 820 | 790 | 544 |
Table 2 steel plate stretches and conventional impact property
Table 3 steel plate timeliness impact property and Z are to performance
The low-cost high-strength oceanographic engineering is with steel plate thickness 50mm, and its chemical ingredients consists of: C 0.06%, Si0.18%, Mn1.49%; Alt0.039%, Nb0.046%, V0.05%, Ti0.014%; Mo0.36%, Cu0.22%, Ni0.4%; P0.009%, S0.0024%, all the other are iron Fe and unavoidable impurities.Billet size is 300*2400*3550mm, and plate size is 50*2500*20448mm, and strand macroscopic examination center segregation is a C class 0.5, and table 4 is the cooling controlling and rolling controlling process parameters under this composition, and table 5 is the mechanical properties that under this processing parameter, obtain.Table 6 steel plate timeliness impact property and Z are to performance.Table 7 is the steel plate experimental result of dropping hammer, and the 50mm Plate Steel nil-ductility temperature TNDT of mensuration is-60 ℃.-40 of welding joint ℃ of ballistic works when table 8 heat input is 50kJ/cm.Accompanying drawing 5 is a 50mm Plate Steel rolling procedure, and accompanying drawing 6, accompanying drawing 7 and accompanying drawing 8 are the microstructure of 50mm Plate Steel.Can find out that steel plate is mainly formed with granular ferrite, acicular ferrite and a small amount of perlite, wherein acicular ferrite more evenly helps guaranteeing the low-temperature flexibility of steel plate.Accompanying drawing 9 is-50 ℃ the experimental result of dropping hammer.Accompanying drawing 10 is for measuring the ductile-brittle transition temperature curve of steel plate, and its heart portion ductile-brittle transition temperature is-65 ℃, and 1/4 place's ductile-brittle transition temperature is-80 ℃.
Table 4 rolling technological parameter
| Thickness of slab/mm | Slab heating temperature/℃ | Start rolling temperature/℃ | The finish rolling start rolling temperature/℃ | Finishing temperature/℃ | Final cooling temperature/ |
| 50 | 1200 | 1049 | 820 | 800 | 484 |
Table 5 steel plate tensile property and conventional impact property
Table 6 steel plate timeliness impact property and Z are to performance
Table 7 experimental result of dropping hammer
Wherein not fracture of zero expression, * expression fracture
-40 of the welding joint joint ℃ of ballistic works when table 8 heat input is 50kJ/cm
Claims (3)
1. a H.T. oceanographic engineering is used steel plate, it is characterized in that, the composition weight percentage of steel plate is: C 0.03-0.08%, Si0.10-0.30%; Mn1.0-1.60%, Alt0.03-0.04%, Nb0.03-0.06%, V0.05-0.09%; Ti0.010-0.02%, Mo0.1-0.4%, Ni0.1-0.4%, Cu0.1-0.4%; P＜0.01%, S＜0.005%, Nb+V+Ti≤0.12%, all the other are Fe and inevitable impurity;
Steel plate thickness specification is 10～50mm, and the steel plate microtexture is granular ferrite, acicular ferrite and a small amount of perlite;
Performance index are: ys >=500MPa, and tensile strength 610-770MPa, unit elongation >=18%, the conventional ballistic work average >=100J of-60 ℃ 1/4 place and heart portion ,-40 ℃ of timeliness ballistic works surpass the steel plate of 200J, and Z surpasses 35% to relative reduction in area.
2. the described oceanographic engineering of claim 1 comprises high clean smelting steel-desulfurizing iron-converter top bottom blowing-vacuum-treat-strand-slab heating-rolling-water-cooled with the method for manufacture of steel plate; It is characterized in that the technical parameter of in the technology of slab heating-roughing-finish rolling, controlling is:
(1) steel billet is heated to 1150～1200 ℃, guarantees steel billet time inside furnace 250～400min;
It is (2) rolling rolling in two stages,, promptly the recrystallization zone is rolling rolling with the non-recrystallization district; 950～1100 ℃ of recrystallization zone rolling sequence start rolling temperatures; Recrystallization zone rolling pass draft guarantees that at least two passages stablize 20～35%; The centre treats that temperature thickness is controlled at 2.0～4.0 times of finished product thickness, control non-recrystallization district start rolling temperature≤910 ℃, and finishing temperature is at 790～840 ℃;
(3) water-cooling process: final cooling temperature is controlled to be 400～600 ℃, and speed of cooling is controlled at 10～15 ℃/s.
3. method according to claim 2 is characterized in that, described oceanographic engineering uses the composition weight percentage of steel plate to be: C 0.03-0.08%, Si0.10-0.30%; Mn1.0-1.60%, Alt0.03-0.04%, Nb0.03-0.06%, V0.05-0.09%; Ti0.010-0.02%, Mo0.1-0.4%, Ni0.1-0.4%, Cu0.1-0.4%; P＜0.01%, S＜0.005%, Nb+V+Ti≤0.12%, all the other are Fe and inevitable impurity.
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| CN110129539A (en) * | 2019-05-31 | 2019-08-16 | 东北大学 | A kind of production technology of 500MPa grades of ocean engineering H profile steel |
| CN110129539B (en) * | 2019-05-31 | 2021-03-23 | 东北大学 | Production process of 500MPa grade H-shaped steel for ocean engineering |
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| WO2021052429A1 (en) * | 2019-09-19 | 2021-03-25 | 宝山钢铁股份有限公司 | Thin-gauge checkered steel plate/strip and manufacturing method therefor |
| WO2022022066A1 (en) * | 2020-08-17 | 2022-02-03 | 莱芜钢铁集团银山型钢有限公司 | Steel board for polar marine engineering and preparation method therefor |
| CN112921248A (en) * | 2021-02-08 | 2021-06-08 | 新疆八一钢铁股份有限公司 | Production method of high-toughness anti-layer-tearing Z-direction steel with thickness of 50mm |
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