CN103014541A - 690MPa thick steel plate for ocean engineering and manufacturing method of steel plate - Google Patents
690MPa thick steel plate for ocean engineering and manufacturing method of steel plate Download PDFInfo
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Abstract
The invention discloses 690MPa thick steel plate for ocean engineering and a manufacturing method of the 690MPa thick steel plate, and belongs to the technical field of steel for the ocean engineering. The steel plate comprises the following chemical components: 0.08-0.15% of C, 0.10-0.30% of Si, 1.0-1.50% of Mn, 0.03-0.04% of Alt, 0.02-0.06% of Nb, 0.03-0.06% of V, 0.010-0.02% of Ti, 0.1-0.5% of Mo, 0.5-1.6% of Ni, 0.1-0.4% of Cu, 0.4-1.2% of Cr, less than 0.01% of P, less than 0.005% of S, less than or equal to 0.12% of Nb+V+Ti, 0.0005-0.0017% of B, and the balance of Fe and inevitable impurities. Quenching temperature and tempering temperature are controlled strictly; the thickness of the produced steel plate is 50-120mm; and the microstructure of the steel plate is tempered sorbite and a little tempered bainite. The steel plate and the manufacturing method have the advantages that the lamellar tearing resistance and low temperature toughness are ensured; uniformity of the thick steel plate in the thickness direction is ensured; and the production cost is reduced.
Description
Technical field
The invention belongs to the Marine Engineering Steel technical field, particularly relate to the thick specification Marine Engineering Steel of a kind of 690MPa level and manufacture method thereof, specifically is exactly the method for the Marine Engineering Steel of a kind of yield strength 690MPa level, toughness plasticity and excellent weldability.
Background technology
Development along with ocean equipment manufacturing technology, requirement to used steel plate improves day by day, especially key positions such as the spud leg of jack-up unit, shoe, socle girder, rack lifting mechanism, the rolled products of ordinary high-strength steel can not satisfy the load requirement, and 460 ~ 690MPa high tensile steel plate is mainly used at these positions.Its spud leg need rise to more than the 90m in the jack-up unit navigation process, and the center of gravity raising causes the platform navigation stability to reduce.Therefore, improve armor plate strength and can make the spud leg lightweight, be conducive to reduce the platform center of gravity, guarantee platform safety.Jack-up unit with the tooth bar steel have that thickness is large, intensity high and low temperature good-toughness and the good characteristics of welding property.Tooth bar steel yield strength requires to be higher than 690MPa, and thickness surpasses 100mm, and maximum ga(u)ge reaches 210mm, and this has increased manufacturing difficulty greatly.
Publication number is that the CN101812642A patent of invention proposes a kind of ultrafine crystal bainite high-strength steel and manufacture method thereof, and its intensity reaches 690MPa, but low-temperature flexibility is lower, only can satisfy-20 ℃, does not study the lamellar tearing performance, and in addition, the finished product maximum ga(u)ge only is 60mm.
Publication number is that the patent intensity rank that the CN101845597 patent of invention proposes reaches 690MPa, and its maximum ga(u)ge is 80mm.
Publication number is that the CN101812642A patent of invention has proposed a kind of employing TMCP explained hereafter yield strength 690MPa, and tensile strength is 780MPa, and-20 ℃ of Charpy-V impact powers are greater than the steel plate of 120J, and its Charpy-V impact power only is-20 ℃, and maximum ga(u)ge is 60mm.
Publication number is that the CN101633996A patent of invention has proposed cheaply 700MPa grade high-strength high toughness hardened and tempered steel plate and manufacture method thereof, and maximum ga(u)ge only is 60mm.
Publication number is the method that the CN101538681A patent of invention has proposed to produce the Yield strength 700 MPa high-strength steel, and ductile-brittle transition temperature is below-60 ℃, but its thickness is 9mm, and the main cold cooling control technology of control that adopts is produced.
Publication number is that CN101984119A patent of invention proposition yield strength is higher than 690MPa, tensile strength is 770-940MPa,-60 ℃ impact is not less than 46J, it adopts TMCP+T, TMCP+L+T, Q+T and Q+L+T explained hereafter ultra high strength ship plate, only be 20-50mm but its specification is thinner, do not relate to anti-lamellar tearing performance and welding property, be mainly results of laboratory.
Summary of the invention
The object of the present invention is to provide the thick specification Marine Engineering Steel of a kind of 690MPa level and manufacture method thereof, thick specification maritime works is used the demand of steel for domestic market, adopt hardening and tempering process to produce high-intensity high-tenacity, easily weld and have the Marine Engineering Steel of good anti-lamellar tearing performance at Heavy Plate Rolling Line, yield strength is 690MPa, steel plate thickness scope 50-120mm.
The thick specification steel plate for ocean engineering of 690MPa level provided by the invention, the chemical composition of percentage composition forms by weight: C 0.08-0.15%, Si0.10-0.30%, Mn1.0-1.50%, Alt0.03-0.04%, Nb0.02-0.06%, V0.03-0.06%, Ti0.010-0.02%, Mo0.1-0.5%, Ni0.5-1.6%, Cu0.1-0.4%, Cr0.4-1.2%, P＜0.01%, S＜0.005%, Nb+V+Ti≤0.12%, B0.0005-0.0017%, all the other are Fe and inevitable impurity.Strict control quenching temperature and tempering temperature, producing the steel plate thickness specification is 50～120mm, the steel plate microtexture is tempered sorbite and a small amount of tempering bainite.
Performance index are: yield strength 〉=690MPa, tensile strength 770-940MPa, unit elongation 〉=14%, the conventional ballistic work average 〉=90J of-60 ℃ 1/4 place and heart section,-40 ℃ of timeliness ballistic works surpass the steel plate of 100J, the Z-direction relative reduction in area surpasses 35%, and steel plate has high-intensity high-tenacity and anti-lamellar tearing performance.
The Composition Design characteristics: for guaranteeing armor plate strength, carbon component designs in the employing, and carbon content surpasses 0.1%, but for guaranteeing low-temperature flexibility, carbon content is no more than 0.15%, and the Ni content that adds simultaneously is more than 0.5%; Strict control Molten Steel Cleanliness, the impurity reduction element guarantees that to the disadvantageous effect of mechanical property P is lower than 0.01%, S and is lower than 0.005%; Strict control Inner Quality of Billet requires strand macroscopic examination center segregation to be lower than C class 1.0; For guaranteeing hardening capacity, add the Cr more than 0.4%, and add the Mo element and further improve hardening capacity, Cr, Mo content increase along with the increase of thickness.
The technique that the present invention produces the thick specification Marine Engineering Steel of 690MPa level comprises: High Clean Steel Melts smelting-desulfurizing iron-converter top bottom blowing-vacuum-treat-strand-heating of plate blank-rolling-water-cooled-quenching-tempering; The parameter of controlling in technique is:
1, the heating of plate blank stage, for microalloy element is fully dissolved, guarantee simultaneously certain autstenitic grain size, with heating steel billet to 1150～1230 ℃, guarantee steel billet time inside furnace 250～400min, not only guarantee heating steel billet fully but also suppress austenite crystal and too grow up;
2, rolling rolling in two stages, namely the recrystallization zone is rolling rolling with the non-recrystallization district; 950～1150 ℃ of recrystallization zone rolling sequence start rolling temperatures, recrystallization zone rolling pass draft guarantees that at least two passages stablize 10～35%, the centre treats that temperature thickness is controlled at 1.1～4.0 times of finished product thickness, district start rolling temperature 860-910 ℃ of control non-recrystallization, and finishing temperature is at 790～850 ℃.
3, water-cooling process: final cooling temperature and the speed of cooling of strictly controlling the laminar flow cooling; For the different thickness specification, final cooling temperature is controlled to be 600～720 ℃, and speed of cooling is controlled at 3～9 ℃/s;
4, adopt modifier treatment technique, quenching temperature is 880～940 ℃, and soaking time is 15～50min, and the stage roller speed of quenching is 2～5m/min, improves steel plate through hardening effect; During temper, adopt different tempering temperatures and time inside furnace for the different thickness steel plate, tempering temperature is 500～660 ℃, and time inside furnace is 50～250min, guarantees that steel plate has high strength and good impelling strength.Wherein, soaking time is the soaking time that the steel plate core temperature begins timing when reaching target temperature; Time inside furnace is that steel plate enters the time that process furnace namely begins timing
The production technique advantage is: adopt the thick strand of 300-400mm to produce thick specification Marine Engineering Steel, improve recrystallization zone rolling sequence draft, guarantee that at least two passage drafts are 10～35%, guarantee anti-lamellar tearing performance and low-temperature flexibility; Guarantee thick steel plates thickness direction homogeneity by chemical composition and optimization rolling technology; According to the steel plate thickness designing chemical composition, reduce the addition of the elements such as Ni, Mo, Cr, reduce production costs.
The steel plate that the present invention produces is compared than the ad eundem steel plate, have that thickness is large, intensity is high, mechanical property is even, the characteristics of excellent in low temperature toughness and comprehensive mechanical property excellence: yield strength 〉=690MPa, tensile strength 770-940MPa, unit elongation 〉=14%, the conventional ballistic work average 〉=90J of-60 ℃ 1/4 place and heart section,-40 ℃ of timeliness ballistic works surpass the steel plate of 100J, and the Z-direction relative reduction in area surpasses 35%, 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.
Following specific examples illustrates technical scheme of the present invention, but protection scope of the present invention is not limited to this:
Description of drawings
Fig. 1 is 50mm Plate Steel rolling procedure figure.
Fig. 2 is the surface microhardness figure in 50mm Plate Steel transverse section.
Fig. 3 is 50mm Plate Steel transverse section 1/4 position micro-organization chart.
Fig. 4 is the micro-organization chart of heart section in 50mm Plate Steel transverse section.
Fig. 5 is the rolling procedure figure of 120mm Plate Steel.
Fig. 6 is the surface microhardness figure in 120mm Plate Steel transverse section.
Fig. 7 is 120mm Plate Steel transverse section 1/4 position micro-organization chart.
Fig. 8 is the micro-organization chart of heart section in 120mm Plate Steel transverse section.
Embodiment
690MPa level steel plate for ocean engineering thickness 50mm, its chemical composition consists of: C 0.1%, Si0.20%, Mn1.04%, Alt0.034%, Nb0.02%, V0.05%, Ti0.015%, Mo0.33%, Ni0.7%, Cu0.28%, Cr0.55%, B0.0012%, P0.008%, S0.002%, all the other are iron Fe and inevitable impurity.Billet size is 300*2400*3000mm, plate size is 50*2500*17280mm, strand macroscopic examination center segregation is C class 0.5, table 1 is the controlled rolling and cooling process parameter under this composition, quenching temperature is 930 ℃, tempering temperature is 650 ℃, and tempering time is 150min, and table 2 is the mechanical properties that obtain under this processing parameter.Table 3 steel plate timeliness impact property and Z-direction performance.-40 of welding joint ℃ of ballistic works when table 8 heat input is 50kJ/cm.Accompanying drawing 1 is 50mm Plate Steel rolling procedure, and accompanying drawing 2, accompanying drawing 3 and accompanying drawing 4 are the microstructure of 50mm Plate Steel.Can find out, steel plate is organized mainly with tempered sorbite, and microstructure difference on thickness direction is little.
Table 1 rolling technological parameter
Table 2 steel plate stretching and conventional impact property
Table 3 steel plate timeliness impact property and Z-direction performance
-40 of the welding joint joint ℃ of ballistic works when table 4 heat input is 50kJ/cm
690MPa level steel plate for ocean engineering thickness 120mm, its chemical composition consists of: C 0.13%, Si0.2%, Mn1.0%, Alt0.039%, Nb0.022%, V0.04%, Ti0.01%, Mo0.42%, Cu0.27%, Ni1.5%, Cr1.12%, B0.0017%, P0.009%, S0.001%, all the other are iron Fe and inevitable impurity.Billet size is 400*2200*3000mm, plate size is 120*2700*8148mm, strand macroscopic examination center segregation is C class 0.5, table 5 is the controlled rolling and cooling process parameters under this composition, quenching temperature is 930 ℃, tempering temperature is 620 ℃, and tempering time is 360min, and table 6 is the mechanical properties that obtain under this processing parameter.Table 7 steel plate timeliness impact property and Z-direction performance.Accompanying drawing 5 is 120mm Plate Steel rolling procedure, and accompanying drawing 6, accompanying drawing 7 and accompanying drawing 8 are the microstructure of 120mm Plate Steel.
Table 5 rolling technological parameter
Table 6 steel plate stretching performance and conventional impact property
Table 7 steel plate timeliness impact property and Z-direction performance
Claims (2)
1. the thick specification Marine Engineering Steel of 690MPa level is characterized in that, chemical composition is by mass percentage: C 0.08-0.15%, Si0.10-0.30%, Mn1.0-1.50%, Alt0.03-0.04%, Nb0.02-0.06%, V0.03-0.06%, Ti0.010-0.02%, Mo0.1-0.5%, Ni0.5-1.6%, Cu0.1-0.4%, Cr0.4-1.2%, P＜0.01%, S＜0.005%, Nb+V+Ti≤0.12%, B0.0005-0.0017%, all the other are Fe and inevitable impurity;
Performance index are: yield strength 〉=690MPa, tensile strength 770-940MPa, unit elongation 〉=14%, the conventional ballistic work average 〉=90J of-60 ℃ 1/4 place and heart section,-40 ℃ of timeliness ballistic works surpass the steel plate of 100J, the Z-direction relative reduction in area surpasses 35%, and steel plate has high-intensity high-tenacity and anti-lamellar tearing performance.
2. method of producing the thick specification steel plate for ocean engineering of 690MPa level claimed in claim 1, technique comprises: High Clean Steel Melts smelting-desulfurizing iron-converter top bottom blowing-vacuum-treat-strand-heating of plate blank-rolling-water-cooled-quenching-tempering; It is characterized in that, the parameter of controlling in technique is:
(1) the heating of plate blank stage, with 1150 ℃～1230 ℃ of heating steel billets, guarantees steel billet time inside furnace 250～400min;
(2) rolling rolling in two stages, 950～1150 ℃ of recrystallization zone rolling sequence start rolling temperatures, recrystallization zone rolling pass draft guarantees that at least two passages stablize 10～35%, the centre treats that temperature thickness is controlled at 1.1～4.0 times of finished product thickness, 860～910 ℃ of control non-recrystallization district start rolling temperatures, finishing temperature is at 790～850 ℃;
(3) water-cooling process: for the different thickness specification, final cooling temperature is controlled to be 600～720 ℃, and speed of cooling is controlled at 3～9 ℃/s;
(4) adopt modifier treatment technique, quenching temperature is 880～940 ℃, and soaking time is 15～50min, and the stage roller speed of quenching is 2～5m/min; Tempering temperature is 500～660 ℃, and time inside furnace is 50～250min.
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