EP4227432A1 - High-heat-input-welding low-temperature-resistant corrosion-resistant steel for cargo oil tanks and manufacturing method therefor - Google Patents

High-heat-input-welding low-temperature-resistant corrosion-resistant steel for cargo oil tanks and manufacturing method therefor Download PDF

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EP4227432A1
EP4227432A1 EP21945363.6A EP21945363A EP4227432A1 EP 4227432 A1 EP4227432 A1 EP 4227432A1 EP 21945363 A EP21945363 A EP 21945363A EP 4227432 A1 EP4227432 A1 EP 4227432A1
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resistant
temperature
corrosion
steel
heat
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English (en)
French (fr)
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EP4227432A4 (en
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Ling YAN
Hua Wang
Changshun WANG
Peng Zhang
Xiaohang Wang
Guanglong LI
Dongxu Wang
Xiangyu QI
Boyong Li
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Definitions

  • the present disclosure relates to the technical field of low-alloy steel for ships, in particular to low-temperature-resistant and corrosion-resistant cargo oil tank steel suitable for high-heat-input welding and a manufacturing method therefor.
  • cargo oil tanks shall be coated for protection or made of corrosion-resistant steel, so as to guarantee that structural steel of the cargo oil tanks can resist corrosion of high concentration chloride ions, temperature alternating and acidic gas phase media, and prevent oil leakage of the oil tankers from polluting marine environmental and endangering safety of the oil tankers.
  • coating protection can only last for 5-7 years, and requires repair and repainting 3-4 times during the 25-year life cycle of the oil tankers, which not only prolongs maintenance man-hours, but also makes the operation environment harsh.
  • out-of-service of the oil tankers due to docking repair has greatly increased their operation cost.
  • corrosion-resistant steel suitable for the oil tankers can only satisfy the welding requirements of conventional low-heat-input no higher than 50 KJ/cm, and there are no reports on corrosion-resistant steel suitable for high-heat-input welding.
  • large shipyards In order to improve the shipbuilding efficiency, large shipyards generally introduce high-heat-input welding apparatuses of, for example, multi-wire submerged arc welding, flux copper backing (FCB), electro-gas welding, so as to efficiently construct oil tankers, and put forward pressing requirements for the corrosion-resistant steel for the oil tankers suitable for high-heat-input welding.
  • high-heat-input welding apparatuses of, for example, multi-wire submerged arc welding, flux copper backing (FCB), electro-gas welding, so as to efficiently construct oil tankers, and put forward pressing requirements for the corrosion-resistant steel for the oil tankers suitable for high-heat-input welding.
  • Disclosed in related patent No. 4 with JP 4935578 and entitled “Corrosion-Resistant Steel Material for Ship” and related patent No. 5 with JP 5130828 and entitled “High-Strength Corrosion-Resistant Steel Material for Ship and Manufacturing Method Thereof” provide one kind of corrosion-resistant steel with desirable low-temperature toughness (quality grade E, -40°C). However, it has merely welding heat-input of 60 kJ/cm, and evaluation of corrosion properties of upper deck and inner bottom plate based on IMO standards are not provided.
  • low-temperature-resistant and corrosion-resistant cargo oil tank steel suitable for high-heat-input welding and a manufacturing method therefor are provided.
  • Low-temperature-resistant and corrosion-resistant cargo oil tank steel suitable for high-heat-input welding includes, by weight in percent:
  • the low-temperature-resistant and corrosion-resistant cargo oil tank steel suitable for high-heat-input welding further includes, by weight in percent, at least one of 0.02%-0.15% Sb, 0.03%-0.10% W, 0.05%-0.15% Mo and 0.05%-0.10% RE.
  • the inevitable impurities include, by weight in percent, 0.0020%-0.0060% N, H ⁇ 0.00015% and O ⁇ 0.0020%.
  • the ratio Ti/N falls within 2.43-3.56.
  • Ni+Cu is ⁇ 0.35% and the ratio Ni/Cu is ⁇ 0.70, and the ratio Ca/S falls within1.8-4.
  • a thickness of a steel plate made of the corrosion-resistant cargo oil tank steel suitable for high-heat input welding is 8-50 mm
  • a pearlite volume fraction of microstructure of the corrosion-resistant steel having a yield strength 1355 MPa (36 Kg) is ⁇ 30%
  • bainite volume fractions of the corrosion-resistant steel having a yield strength of ⁇ 370 MPa (40 Kg) and that of ⁇ 420 MPa are ⁇ 35%.
  • C is a necessary element for guaranteeing strength of steel and has a content of 0.04% or higher. However, when the content exceeds a certain amount, welding crack sensitivity may be improved resulting in deterioration of a welding property.
  • increase of the C content may also increase a content of pearlite phases containing lamellar cementite in steel. In acidic environment, pearlite becomes cathode and may promote corrosion accordingly; moreover, a heat affected zone (HAZ) near a re-fusion line of a welded steel plate is prone to produce MA, thereby significantly reducing low-temperature toughness of the material, and determining an upper limit of the C content to 0.13%.
  • HZ heat affected zone
  • Si is a main deoxidizing component in a steelmaking process, and shall have a content of 0.10% or higher for sufficient deoxidizing effect. However, if the content of Si exceeds an upper limit, toughness of a base metal and a welded portion may be reduced, and Si in the form of a solid solution may increase a ductile-brittle transition temperature while improving a strength, so the content of Si ranges from 0.10% to 0.40%.
  • Mn is a necessary element to guarantee the strength and the toughness of steel. Mn combines with S to form MnS, so as to avoid hot cracks caused by FeS at a grain boundary. Besides, Mn is also a desirable deoxidizer. As a low-cost strengthening and toughening element, a too low content of Mn may not guarantee material strength. However, Mn with a content higher than 1.30% may worsen segregation of the slab and low-temperature toughness of a coarse grained heat affected zone (CGHAZ), so the Mn content should be controlled within 0.60%-1.30%.
  • CGHAZ coarse grained heat affected zone
  • P is an inevitable impurity element in steel and may worsen toughness and weldability of same.
  • a research shows that when P content is higher than 0.012%, corrosivity of P under the condition of an acid gas phase medium on the upper deck decreases significantly, so as to determine an upper limit to 0.012%.
  • an upper limit of the S content is determined to be 0.006%.
  • Al as a deoxidizing and grain refining element, is generally added by an amount of 0.01% or more.
  • Al with a too high content is prone to produce hot cracks in a slab, and a large quantity of Al 2 O 3 inclusions (hard phase inclusions) are formed, which may significantly reduce toughness of steel. Therefore, the upper limit of the Al content is determined to be 0.05%.
  • Sn is an essential component in the present disclosure for improving corrosion resistance.
  • Sn exists in steel in the form of solid solution, which may significantly improve electrochemical corrosion self-potential of steel, thus inhibiting corrosion of steel in acid corrosive environment.
  • Sn with a content lower than 0.03% may not effectively improve corrosion resistance, and Sn with a content higher than 0.15% may be enriched in austenite grain boundaries during hot working processes such as continuous casting and rolling, and may reduce high-temperature plasticity accordingly. Therefore, the content of Sn ranges from 0.03% to 0.15%.
  • Ni is conducive to formation of a dense rust layer on the surface of steel when added by a proper amount, and may inhibit corrosion reaction of steel, especially when coexisting with Cu, Cr, etc. Because Ni may increase strength, reduce a critical cooling rate and delay pearlite transformation, Ni is conducive to microstructure control, grain refinement and low-temperature toughness improvement. However, under the condition of S-containing atmosphere, formation of nickel sulfide may cause red brittleness of steel, so the content of Ni should not be too high. Therefore, the content of Ni is controlled within 0.15%-0.40% in the present disclosure.
  • Cu may obviously improve corrosion resistance of a steel plate, especially seawater corrosion resistance, and may obviously guarantee corrosion resistance of the steel plate of the present disclosure.
  • Cu with a high content is unfavorable to toughness and prone to cause steel plate embrittlement, and is controlled within 0.15%-0.50% of the present disclosure.
  • Cu/Ni composite addition has main action mechanisms in steel in the following two aspects: on the one hand, addition of Cu and Ni promotes formation of ⁇ -FeOOH in steel.
  • Ni may promote formation of spinel oxides and increase a density of a rust layer; Cu may become a core of oxide crystallization in the rust layer, thus promoting formation of ⁇ -FeOOH.
  • ⁇ -FeOOH is a relatively stable phase in the rust layer, and may hardly transform into other phases once formed, so as to avoid cracks and defects caused by volume change caused by phase transformation.
  • Cu may dissolve to form Cu 2+ and form an insoluble protective film with some anions, for example, Cu 2 S which effectively protects a substrate, and these insoluble salts of Cu may repair and protect cracks and holes, thus improving compactness of the continuous rust layer. Therefore, it is determined that the addition amount of Ni+Cu is ⁇ 0.35% and the ratio of Ni/Cu is ⁇ 0.70 in steel, so as to inhibit adverse effects of Cu on low temperature toughness.
  • Sb may improve corrosion resistance of steel like Sn, and is proved to effectively improve corrosion resistance of steel in acid corrosive environment. If added with Sn, Sb may further improve the corrosion resistance of steel, and is an optional added element of the present disclosure. Sb with the content higher than 0.15% may enable the corrosion resistance to be saturated and reduces thermoplasticity of steel. Therefore, the content of Sb ranges from 0.02% to 0.15%.
  • W is an optional added element for improving corrosion resistance in the present disclosure.
  • W may form WO 4 2- ions in acidic corrosive environment to inhibit corrosion of anions such as Cl- ions, and may also form a dense layer of FeWO 4 to inhibit corrosion.
  • W with the content higher than 0.10% may enable the corrosion resistance effect to be saturated, and is not conducive to weldability, so an upper addition limit is 0.10%.
  • Cr forms a dense Cr 2 O 3 layer on a steel surface along with oxidation, and may inhibit intrusion of anions in acid corrosion environment, thus reducing enrichment of Cl - and other anions on the steel surface, and has a desirable pitting corrosion resistance effect for a steel plate in inner bottom plate environment.
  • Cr with a too-high content may increase welding crack sensitivity.
  • an optimum addition content of Cr ranges from 0.10% to 0.25%.
  • Mo may improve corrosion resistance of steel like W and Cr, and may promote formation of a dense rust layer on the surface of steel and prevent further development of corrosion. With consideration of cost and corrosion resistance, an optimum addition content of Mo ranges from 0.05% to 0.15%.
  • RE has a function of steel purification, and may effectively purify grain boundaries, thus improving corrosion resistance of the grain boundaries and reducing an overall corrosion rate.
  • RE is a desirable desulfurizing and deoxidizing agent, and may improve low-temperature toughness and weldability.
  • RE as a modifier may improve a shape, a size and distribution of inclusions, and further enhance comprehensive mechanical properties of materials.
  • RE with a too-high content may increase difficulty of smelting and continuous casting, and increase manufacturing cost of products. Therefore, the content of RE in the present disclosure is controlled ranging from 0.05% to 0.10%.
  • Nb may effectively refine a grain size of steel and is an element added to improve strength and toughness of same.
  • Nb with a content lower than 0.005% produces little positive effect on the strength and the toughness of steel
  • Nb with a content higher than 0.020% may produce MA brittle components easily during high-heat input welding, so as to reduce weldability and low-temperature toughness of steel. Therefore, the content of Nb ranges from 0.005% to 0.020%.
  • Ti is a component added to improve toughness of steel and welded portions. As a strong N-fixing element, Ti is prone to form TiN and therefore improves N-porosity resistance of weld metal. Ti with a content lower than 0.005% has little effect. Ti with a content higher than 0.021% is prone to form large particles of TiN and loses effect. In order to obtain low-temperature toughness of a steel plate under high heat input, it is necessary to control the ratio of Ti:N in steel within 2.43-3.56, so an addition content of Ti ranges from 0.005% to 0.021%.
  • Ca combines S to form CaS which may coat alumina and other inclusions, and achieve denaturation and spheroidization of the inclusions, and therefore facilitate improvement of corrosion resistance, toughness and fatigue resistance.
  • fine dispersed CaS formed in advance may reduce the formation ratio of MnS, and CaS reacts with H 2 O to dissociate alkaline OH - ions, which may reduce an acidification degree of corrosion pits and smaller pitting corrosion sensitivity.
  • CaO with a fine size formed in steel may also play a role in grain refinement and material toughness improvement.
  • the Ca content ranges from 0.007% to 0.024% and the ratio of Ca/S ranges from 1.8% to 4%.
  • N may form fine precipitates with Nb, Ti and V, play a role of strengthening and grain refinement, and improve strength and toughness of steel.
  • N with a too high content may deteriorate the toughness, and the content should be controlled ranging from 0.0020% to 0.0060%.
  • H and O are harmful impurity elements in the present disclosure. Increase contents of H and O may lead to improvement of hydrogen-induced cracking tendency and increase of inclusions, and decrease of corrosion resistance and fatigue resistance. Therefore, in the present disclosure, H is controlled ⁇ 0.00015% and O is controlled ⁇ 0.0020%.
  • the present disclosure further discloses a method for manufacturing the low-temperature-resistant and corrosion-resistant cargo oil tank steel suitable for high-heat-input welding.
  • the manufacturing method includes:
  • the initial rolling temperature of the second-stage rolling ranges from 850°C to 900°C
  • the final rolling temperature of the second-stage rolling ranges from 840°C to 860°C
  • the rolled steel plate is cooled to 550°C to 600°C at the cooling rate of 5°C/s to 15°C/s.
  • the initial rolling temperature of the second-stage rolling ranges from 850°C to 890°C
  • the final rolling temperature of the second-stage rolling for a rolled steel plate ranges from 800°C to 840°C
  • the rolled steel plate is cooled to 500°C to 560°C at the cooling rate of 7°C/s to 20°C/s.
  • the manufacturing method further includes offline cooling: shearing and getting a finished product steel plate with a thickness ⁇ 40 mm off a production line, and transporting same to a finished product stacking area; and stacking, for not shorter than 24 hours, to slowly cool a straightened finished steel plate with a thickness ⁇ 40 mm with an initial temperature being 250°C to 400°C, and shearing and getting the product off a production line, and transporting same to a finished product stacking area.
  • smelting production is performed by primary point blowing with high catch carbon.
  • basicity of final slag falls within 3.2-4.1, and tapping time is not shorter than 5 min.
  • aluminum particles, silicon carbide and calcium carbide are used to adjust the slag, and the final slag after refining has basicity ⁇ 2.4.
  • Ca treatment is performed, and wire feeding for molten steel in each furnace is 200-300 m.
  • a degree of superheat is ⁇ 25°C
  • secondary cooling in the continuous casting process adopts weak cooling
  • a casting speed of continuous cast plate slab is 0.8 m/min-1.2 m/min
  • a thickness of continuous cast plate slab is 200 mm-360 mm;
  • the ratio of a thickness of the intermediate slab to a thickness of a finished steel plate is not less than 2.5:1, and a cumulative reduction rate of the first-stage rolling and the second-stage rolling is not less than 50%.
  • the steel plate formed with the steel provided by the present disclosure has a Charpy impact toughness ⁇ 198 J at -60°C, an ECL corrosion rate (25-year extrapolated corrosion rate) ⁇ 2.0 mm, and a fracture toughness satisfying the characteristic value ⁇ c ⁇ 0.8 mm at -10°C of crack tip opening displacement (CTOD). And after welding at 240 KJ/cm, Charpy impact toughness (AKv) of a weld joint is ⁇ 170 J at -40°C.
  • the corrosion-resistant steel is mainly designed for overall uniform corrosion of the upper deck and local pitting corrosion of the inner bottom plate of the storage and transportation tank of the polar route oil tanker, and the material has excellent low-temperature toughness (satisfying -60°C) and may be welded with large heat input (linear energy of 240 KJ/cm).
  • IACS International Association of Classification Societies
  • the present disclosure has the following advantages:
  • the present disclosure may be widely popularized in the fields including low alloy marine steel.
  • the present disclosure discloses a low-temperature-resistant and corrosion-resistant cargo oil tank steel suitable for high-heat-input welding.
  • the low-temperature-resistant and corrosion-resistant cargo oil tank steel suitable for high-heat-input welding includes, by weight in percent:
  • the low-temperature-resistant and corrosion-resistant cargo oil tank steel suitable for high-heat-input welding further includes, by weight in percent, at least one of 0.02%-0.15% Sb, 0.03%-0.10% W, 0.05%-0.15% Mo and 0.05%-0.10% RE.
  • the inevitable impurities include, by weight in percent, 0.0020%-0.0060% N, H ⁇ 0.00015% and O ⁇ 0.0020%.
  • Ni+Cu is ⁇ 0.35% and the ratio Ni/Cu is ⁇ 0.70, the ratio Ti/N falls within 2.43-3.56, and the ratio Ca/S falls within 1.8-4.
  • a thickness of a steel plate made of the corrosion-resistant cargo oil tank steel suitable for high-heat input welding is 8-50 mm
  • a pearlite volume fraction of a microstructure of corrosion-resistant steel with a yield strength 1355 MPa (36 Kg) is ⁇ 30% (see FIG 1 )
  • bainite volume fractions of corrosion-resistant steel with a yield strength of ⁇ 390 MPa (40 Kg) and 1420 MPa are ⁇ 35% (see FIG 2 ).
  • the composition design and the manufacturing method of the present disclosure is use to control a microstructure and the phase ratio of corrosion-resistant steels with different strength grades.
  • grade 355 KPa(36 Kg) high-strength steel a microstructure of polygonal ferrite+a small amount of pearlite (see FIG 1 ) is obtained, and a volume fraction of pearlite is ⁇ 30%.
  • ultra-high strength steel with grades 390 MPa (40 Kg) and 420 MPa a microstructure of acicular ferrite+a small amount of bainite is obtained (see FIG 2 ), a bainite volume fraction is ⁇ 35%.
  • grain sizes of steel plates of various steel grades and thicknesses are effectively controlled. Since a relatively single microstructure plays a desirable role in reduction of corrosion potential differences between different phases and high corrosion resistance of materials.
  • Embodiments 1 to 10 The element compositions of Embodiments 1 to 10 and weight percents thereof are shown in Table 1.
  • Table 1 C Si Mn P S Nb Ti Sn Ni Cu RE 0.04 0.10 1.30 0.006 0.006 0.012 0.013 0.05 0.15 0.20 / 0.05 0.36 1.10 0.009 0.0054 0.017 0.012 0.03 0.30 0.15 0.05 0.073 0.28 1.16 0.005 0.0055 0.020 0.011 0.148 0.20 0.27 / 0.13 0.40 0.60 0.010 0.0044 0.015 0.011 0.12 0.24 0.25 0.072 0.085 0.20 0.97 0.012 0.0025 0.006 0.008 0.08 0.18 0.21 / 0.10 0.33 0.68 0.010 0.0039 0.008 0.014 0.05 0.40 0.50 0.10 0.077 0.29 0.95 0.009 0.005 0.010 0.008 0.13 0.28 0.36 / 0.092 0.37 1.25 0.006 0.0053 0.017 0.005 0.06
  • This embodiment further discloses a method for manufacturing the low-temperature-resistant and corrosion-resistant cargo oil tank steel suitable for high-heat-input welding.
  • the manufacturing method includes:
  • Smelting is performed with deep desulfurized molten iron, where a weight percent of sulfur in the deep desulfurized molten iron is ⁇ 0.002%; after the molten iron reaches a converter, contents of elements are adjusted in the converter to satisfy the chemical components and weight percents thereof in the above description, processes combining "double slag" dephosphorization with "slag skimming" of tapping side molten steel are used for smelting; smelting production is performed by primary point blowing with high catch carbon; basicity of final slag falls within 3.2-4.1, through effective slag retaining operation, a large amount of slag carry-over is eliminated, and tapping time is not shorter than 5 min.
  • refining is performed, specifically secondary refining on molten steel taken out of the converter, so as to further reduce contents of harmful impurities such as O, S and nonmetallic inclusions.
  • aluminum particles, silicon carbide and calcium carbide are used to adjust the slag, and the final slag after refining has basicity ⁇ 2.4 ("double slag" refers to final slag of smelting and refining); and after completion of the refining, Ca treatment is performed, and wire feeding for molten steel in each furnace is 200 m-300 m.
  • Continuous casting is performed on the molten steel subjected to secondary refining to obtain a plate slab; in a continuous casting process, a degree of superheat is ⁇ 25°C, secondary cooling in the continuous casting process adopts weak cooling, a casting speed of continuous cast plate slab is 0.8 m/min-1.2 m/min, and a thickness of casted plate slab is 200 mm-360 mm.
  • the plate slab is heated to 1100-1150°C for 3-5 hours. This heating temperature is used because a temperature lower than 1100°C is not hot enough to completely dissolve alloying elements into austenite, and therefore may not guarantee a final rolling temperature required for hot rolling. However, when the temperature is higher than 1150°C, original austenite grains coarsen significantly, and significantly reduces the low-temperature toughness of the steel plate accordingly.
  • Second-stage rolling first-stage rolling is performed on the intermediate slab, where an initial rolling temperature of the first-stage rolling is 950°C-1100°C, an initial rolling temperature of the second-stage rolling is 850°C-900°C, and a final rolling temperature of the second-stage rolling is 800°C-860°C.
  • the rolling temperature is selected to satisfy the requirements of mechanical properties of corrosion-resistant steel.
  • An austenite recrystallization temperature zone is 950°C-1100°C
  • an austenite non-recrystallization temperature zone is 850°C-900°C.
  • the ratio of a thickness of the intermediate slab to a thickness of a steel plate subjected to second-stage rolling is not less than 2.5:1, and a cumulative reduction rate of the first-stage rolling and the second-stage rolling is not less than 50%.
  • On-line cooling a rolled steel plate is cooled to 500°C-600°C at a cooling rate of 5°C/s-20°C/s to obtain the steel plate.
  • different rolling temperatures in the non-recrystallization zone and cooling rates may be selected.
  • the initial rolling temperature of second-stage rolling falls within 850°C-900°C
  • a cooling manner is of multi-stage laminar cooling
  • the cooling rate is controlled within 5°C-15°C/s
  • the rolled steel plate is cooled to 550°C-600°C.
  • the volume fraction of the pearlite in the microstructure of the obtained steel plate is ⁇ 30%.
  • the initial rolling temperature of second-stage rolling is 850°C-890°C
  • the final rolling temperature of that is 800°C-840°C
  • the steel plate is cooled to 500°C-560°C at a cooling rate of 7°C/s- 20°C/s.
  • the bainite volume fraction in the microstructure of the obtained steel plate is ⁇ 35%.
  • a finished product steel plate with a thickness ⁇ 40 mm is sheared and gotten off a production line, and transported to a finished product stacking area.
  • a finished steel plate with a thickness ⁇ 40 mm is, after being straightened, stacked for not shorter than 24 hours to slowly cool with an initial temperature being 250°C-400°C,and then the finished product steel is sheared and gotten off the production line, and transported to the finished product stacking area.
  • the corrosion-resistant steel plate made by the above method has a thickness of 8mm-50mm, has excellent comprehensive mechanical properties, and is suitable for high-heat-input welding.
  • the corrosion-resistant steel plate made by the above method has excellent corrosion resistance detected with a corrosion evaluation method specified by IMO and may be used without coating protection.
  • Embodiments 1 to 10 The process parameters of heating-rolling-cooling control in Embodiments 1 to 10 are shown in Table 2.
  • Table 2 Embodi ments Steel grade Thickne ss of plate mm Heatin g temper ature , °C Rolling tempera ture of first-sta ge rolling , °C Tempera ture-hol ding thicknes s of intermed iate slab (t represen ts finished product) Rolling temperature of second-stage rolling, °C Initia 1 temp eratu re of wate r-coo ling/ °C Final temp eratu re of wate r-coo ling/ °C Cooling rate of water-c ooling /°C/s Initial Final 1 355MPa 8 1100 1050 2.5t 890 860 760 595 5.0 2 355MPa 30 1120 1040 3.0t 900 850 788 568 15.0 3 355MPa 40 1135 1050 2.5t
  • the final rolling temperature is different from the initial temperature of water-cooling because the temperature may naturally decrease during transportation.
  • Embodiments 1 to 10 Mechanical properties of Embodiments 1 to 10 are shown in Table 3.
  • Table 3 Number Plate thickness mm
  • Tensile properties Impact properties CTOD -10°C ( ⁇ c), mm Ageing impact AKv (-40°C) (J) Microstr ucture proporti on (%) Yield strength Reh (MPa)
  • Embodi ments 1 8 402 522 25.5 -60 244 0.82 132 pearlite 20% 2 30 375 526 30 -60 329 214 182 pearlite 25% 3 40 367 512 27.5 -60 262 1.56 156 pearlite 18% 4 50 395 518 29.5 -60 332 1.32 175 bainite 10% 5 32 421 538 28 -60 254 0.90 128 bainite 12% 6 20 435 572 24.5 -60 265 0.94 206 bainite 20% 7 8 4
  • the yield strength of 390 MPa steel provided by the present disclosure falls within 395 MPa to 435 MPa, the tensile strength of that falls within 518 MPa to 572 MPa, and the elongation after fracture is 24.5% and above.
  • impact toughness falls within 254 J to 332 J, and fracture toughness satisfies CTOD -10°C ⁇ 0.90mm higher than ⁇ 0.40mm specified by ship codes.
  • the yield strength of 420 MPa steel provided by the present disclosure falls within 435 MPa to 475 MPa, the tensile strength of that falls within 565 MPa to 602 MPa, and the elongation after fracture of that is 22.5% and above.
  • impact toughness falls within 198 J to 232 J, and fracture toughness satisfies CTOD -10°C ⁇ 0.80 mm far higher than ⁇ 0.40 mm specified by ship regulations.
  • corrosion-resistant steels of various steel grades have desirable mechanical property stability and surplus strength and toughness indexes, and may fully satisfy the material design requirements from high-toughness, high-weldability, corrosion-resistant steel for oil tankers.
  • Embodiments 1-10 the corrosion rate of corrosion-resistant steel for upper deck based on IMO 289(87) standard is shown in Table 5.
  • Table 5 Number Plate thickness mm 25-year extrapolated corrosion rate (ECL/mm) Etching step height ( ⁇ m)
  • Base metal Weld joint IMO standard Measured value IMO standard Embodiments 1 8 1.27 1.32 ⁇ 2.0 8.4 ⁇ 30 2 30 1.43 1.49 16.3 3 40 1.12 1.18 7.5 4 50 1.26 1.55 12.0 5 32 1.48 1.52 19.5 6 20 1.33 1.35 17.0 7 8 1.05 1.22 10.2 8 36 1.21 1.40 12.5 9 44 1,33 1,56 13.6 10 28 1.55 1.74 22.3
  • the ECL corrosion rate (25-year extrapolated corrosion rate) of the steel provided by the present disclosure is ⁇ 2.0 mm satisfying the standards. Furthermore, it can be intuitively seen from FIGs 5-6 that an etching step height in Embodiment 4 is 12 ⁇ m satisfying the standards undoubtedly.
  • Embodiments 1-10 the corrosion rate of corrosion resistant steel for inner bottom plate based on IMO 289(87) standard is shown in Table 6.
  • Table 6 Number Plate thickness mm average corrosion rate (mm/year) Etching step height ( ⁇ m)
  • Base metal Weld joint IMO standard Measured value IMO standard Embodiments 1 8 0.57 0.60 ⁇ 1.0 16.8 ⁇ 30 2 30 0.63 0.65 10.2 3 40 0.52 0.53 15.5 4 50 0.46 0.51 13.8 5 32 0.68 0.72 12.0 6 20 0.54 0.60 15.6 7 8 0.42 0.51 40 8 36 0.48 0.56 18.35 9 44 0.55 0.62 19.0 10 28 0.64 0.80 21.3
  • the annual average corrosion rate of the steel provided by the present disclosure is ⁇ 0.72 mm satisfying the IMO standards, and the corrosion step height further satisfies the IMO standards. It can be seen intuitively from FIGs 3-4 that the etching step height in Embodiment 7 is 4 ⁇ m, even better than a required value of the IMO standards.
  • the low-temperature-resistant and corrosion-resistant cargo oil tank steel suitable for high-heat-input welding satisfies the ship codes, has properties far higher than those in the ship codes, and has desirable corrosion resistance, excellent low-temperature toughness at -60 °C , and desirable strength and toughness even when the welding heat input reaches 240 KJ/cm, and therefore satisfies application technical requirements from the materials needed for construction of the cargo oil tank of the polar route oil tanker.

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EP21945363.6A 2021-11-19 2021-11-25 CORROSION RESISTANT AND LOW TEMPERATURE RESISTANT STEEL FOR HIGH HEAT INPUT WELDING FOR CARGO OIL TANKS AND METHOD FOR MANUFACTURING SAME Pending EP4227432A4 (en)

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