WO2020237975A1 - 一种LNG储罐用7Ni钢板及生产工艺 - Google Patents
一种LNG储罐用7Ni钢板及生产工艺 Download PDFInfo
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- WO2020237975A1 WO2020237975A1 PCT/CN2019/111410 CN2019111410W WO2020237975A1 WO 2020237975 A1 WO2020237975 A1 WO 2020237975A1 CN 2019111410 W CN2019111410 W CN 2019111410W WO 2020237975 A1 WO2020237975 A1 WO 2020237975A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Definitions
- the invention relates to the technical field of steel smelting, in particular to a 7Ni steel plate for LNG storage tanks and a production process.
- 201310285597.4 A high-nickel steel for ultra-low temperature pressure vessel and its manufacturing method involves a steel with a Ni mass fraction of 7.00% to 7.50%.
- the 7Ni steel plate obtained by the twice quenching + tempering process can replace 9Ni steel.
- Application No. 201310494688.9 A low Ni and high Mn economical low temperature steel and its manufacturing method that can be used at -196°C” involves a steel with a Mn mass fraction of 1.00% to 1.50%, and a Ni mass fraction of 7.00% to 8.00%. Using two quenching and tempering processes, the Ni steel obtained has excellent toughness at -196°C.
- the application number 201410369201.9 "low-cost ultra-low temperature nickel steel and its manufacturing method" adopts normalizing + quenching + tempering process to obtain Ni steel with excellent toughness at -196°C.
- the UFC+TMCP process is used to directly cool the steel plate to below the martensite transformation temperature after rolling to replace the offline quenching process, simplify the heat treatment process, and improve the low temperature toughness of the 7Ni steel plate.
- the present invention overcomes the shortcomings of the prior art and provides a 7Ni steel plate for LNG storage tanks and a production process. Under the premise of ensuring the performance of the steel for LNG storage, the Ni content is reduced as much as possible, and a Economical and feasible preparation method.
- the present invention provides a 7Ni steel plate for LNG storage tanks, the chemical composition and mass percentage are as follows: C: 0.02% ⁇ 0.06%, Si: 0.20% ⁇ 0.35%, Ni: 4.0% ⁇ 8.0%, Mn: 0.3% ⁇ 0.7%, P ⁇ 0.005%, S ⁇ 0.005%, Al: 0.03% ⁇ 0.05%, Nb: 0.02% ⁇ 0.05%, Cr: 0.2% ⁇ 0.4%, the balance is Fe and unavoidable impurities .
- the present invention adopts the design of Nb, Cr microalloyed Ni-type alloy, and innovates a normalizing rolling + two-phase zone quenching + tempering production process, eliminating the rapid cooling process after rolling, and not only saving energy , And provide a good plate shape for the smooth implementation of the subsequent quenching process, and finally obtain the LNG storage tank steel with excellent mechanical properties.
- the thickness is 8-30 mm.
- Another object of the present invention is to provide a 7Ni steel plate production process for LNG storage tanks, including
- Casting billet preparation smelting raw materials according to chemical composition, smelting in a vacuum smelting furnace, casting into ingots, then forging the ingots into square billets, and air cooling in a sheltered place;
- the casting slab is kept at 1150 ⁇ 1250°C for 2 ⁇ 3h; the casting slab is rolled in two stages, in which the opening temperature of rough rolling is 1000 ⁇ 1100°C, and the total reduction ratio is 40% ⁇ 60%.
- the start rolling temperature of the finishing rolling is 850 ⁇ 900°C, the total reduction ratio is 40% ⁇ 70%, the final rolling temperature is 750 ⁇ 850°C, and then air cooling;
- Two-phase zone quenching + tempering Quench the rolled steel plate at 600-700°C to below 300°C, and then temper at 500-580°C, tempering rate of 5-20°C/s, holding time for 0.5-2h, Air cooling.
- the aforementioned 7Ni steel plate production process for LNG storage tanks, the chemical composition and mass percentage of the steel plate are as follows: C: 0.05%, Si: 0.25%, Mn: 0.60%, Ni: 7.2%, P: 0.0045%, S : 0.0030%, Al: 0.038%, Cr: 0.28%, Nb: 0.043%, the balance is Fe and unavoidable impurities;
- Casting billet preparation smelting raw materials according to chemical composition, smelting in a vacuum smelting furnace, casting into ingots, then forging the ingots into a square billet with a thickness of 80mm, and air cooling in a sheltered place;
- Normalizing rolling send the cast slab to a heating furnace, heat it to 1156°C, hold for 2.6 hours, and take it out for rolling; the cast slab is rolled in two stages, in which the rough rolling is rolled in the austenite completely recrystallized zone.
- the start-rolling temperature is 1100°C
- the reduction is 60%
- the finish rolling is rolled in the austenite non-recrystallization zone
- the start-rolling temperature is 900°C
- the reduction is 63%
- the final rolling temperature is 790°C
- air cooling Form 12mm thick hot-rolled steel plate rolling
- Quenching in two-phase zone + tempering Quench the rolled steel plate at 660°C to below 300°C, and then temper at 560°C at a tempering rate of 10°C/s, heat preservation for 1 hour, and air cooling.
- the aforementioned 7Ni steel plate production process for LNG storage tanks, the chemical composition and mass percentage of the steel plate are as follows: C: 0.06%, Si: 0.23%, Mn: 0.55%, Ni: 7.3%, P: 0.0043%, S : 0.0031%, Al: 0.035%, Cr: 0.25%, Nb: 0.040%, the balance is Fe and unavoidable impurities;
- Casting billet preparation smelting raw materials according to chemical composition, smelting in a vacuum smelting furnace, casting into ingots, then forging the ingots into a square billet with a thickness of 80mm, and air cooling in a sheltered place;
- Normalizing rolling send the cast slab to a heating furnace, heat it to 1239°C, hold for 2.1h, and take it out for rolling; the cast slab is rolled in two stages, in which the rough rolling is rolled in the austenite completely recrystallized zone.
- the opening temperature is 1100°C
- the reduction is 60%
- the finish rolling is rolled in the austenite unrecrystallized zone
- the opening temperature is 900°C
- the reduction is 45%
- the final rolling temperature is 790°C
- air cooling Form 18mm thick hot-rolled steel plate rolling
- Two-phase zone quenching + tempering quench the rolled steel plate at 660°C to below 300°C, then temper at 560°C, tempering rate of 10°C/s, heat preservation for 1h, air cooling.
- nickel is a non-carbide forming element, which can expand the ⁇ phase region, is an austenite forming and stabilizing element, and improves low temperature toughness without reducing strength; nickel can shift the CCT curve of steel to the right, Thereby reducing the critical quenching speed and improving the hardenability; nickel also has an important effect of improving low temperature toughness and reducing the ductile-brittle transition temperature, so Ni is the most important alloying element of the present invention;
- carbon is a strong solid solution strengthening element and a strong austenite stabilizing element. It has a positive effect on the strength of the steel plate, but has an adverse effect on the toughness, plasticity and welding performance. Therefore, in order to make the low temperature steel plate It has good impact toughness and welding performance, and the carbon content needs to be controlled in a low range;
- manganese mainly plays a role of solid solution strengthening, which can compensate for the decrease in strength caused by the reduction of carbon content; at the same time, manganese, like nickel, can reduce the phase transition temperature of steel and appropriately increase Mn/C and Mn/S Conducive to the improvement of toughness, so the present invention uses Mn as one of the main alloying elements;
- silicon is a solid solution strengthening element and a deoxidizing element, which can increase the strength of steel and reduce the content of harmful element oxygen in the steelmaking process; in addition to silicon and manganese in a certain proportion, it exists in the steel to inhibit manganese segregation. In addition, it can also inhibit the segregation of phosphorus in the grain boundary, but silicon will deteriorate the low-temperature toughness of the welding heat-affected zone of steel, so the silicon content is controlled at 0.15-0.3%;
- chromium in the present invention can improve the hardenability of the steel plate and increase the strength of the steel plate; adding a small amount of Nb and controlling a certain Nb/Si range is not only harmless to the strength and plasticity, but also helps to improve the wide and thick plates
- the welding performance of steel; S and P are harmful elements in steel, which are easy to cause segregation, reduce the low temperature toughness of steel, and increase the sensitivity of hot cracking during welding. Therefore, the content of P and S in steel must be strictly controlled;
- the cross-sectional structure of the present invention is that martensite and rotating austenite are distributed on the ferrite matrix; the mechanical properties are: the yield strength is 590-700MPa, the tensile strength is 690-790MPa, and the elongation is ⁇ 24% , The transverse impact energy at -196°C is ⁇ 100J.
- Figure 1 is a metallographic photo of Example 1
- Figure 2 is a metallographic photo of Example 2.
- This embodiment provides a 7Ni steel plate for LNG storage tank and its production process.
- the chemical composition and mass percentage of the steel plate are as follows: C: 0.05%, Si: 0.25%, Mn: 0.60%, Ni: 7.2%, P: 0.0045% , S: 0.0030%, Al: 0.038%, Cr: 0.28%, Nb: 0.043%, the balance is Fe and unavoidable impurities.
- Billet preparation smelting raw materials according to chemical composition, smelting in a vacuum smelting furnace, casting into an ingot, then forging the ingot into a square billet with a thickness of 80mm, and air cooling in a sheltered place.
- Normalizing rolling send the cast slab to a heating furnace, heat it to 1156°C, hold for 2.6 hours, and take it out for rolling; the cast slab is rolled in two stages, in which the rough rolling is rolled in the austenite completely recrystallized zone.
- the start-rolling temperature is 1100°C
- the reduction is 60%
- the finish rolling is rolled in the austenite non-recrystallization zone
- the start-rolling temperature is 900°C
- the reduction is 63%
- the final rolling temperature is 790°C
- air cooling Form a 12mm thick hot rolled steel sheet.
- Quenching in two-phase zone + tempering Quench the rolled steel plate at 660°C to below 300°C, and then temper at 560°C at a tempering rate of 10°C/s, heat preservation for 1 hour, and air cooling.
- This embodiment provides a 7Ni steel plate for LNG storage tank and its production process.
- the chemical composition and mass percentage of the steel plate are as follows: C: 0.06%, Si: 0.23%, Mn: 0.55%, Ni: 7.3%, P: 0.0043% , S: 0.0031%, Al: 0.035%, Cr: 0.25%, Nb: 0.040%, the balance is Fe and unavoidable impurities.
- Billet preparation smelt raw materials according to chemical composition, smelt in a vacuum smelting furnace, cast into ingots, then forge the ingots into square billets with a thickness of 80mm, and cool in air in a sheltered place.
- Normalizing rolling send the cast slab to a heating furnace, heat it to 1239°C, hold for 2.1h, take it out for rolling; carry out two-stage rolling on the cast slab, in which the rough rolling is rolled in the austenite completely recrystallized zone.
- the opening temperature is 1100°C
- the reduction is 60%
- the finish rolling is rolled in the austenite non-recrystallization zone
- the opening temperature is 900°C
- the reduction is 45%
- the final rolling temperature is 790°C
- air cooling Rolld into 18mm thick hot-rolled steel sheet.
- Quenching in two-phase zone + tempering Quench the rolled steel plate at 660°C to below 300°C, and then temper at 560°C at a tempering rate of 10°C/s, heat preservation for 1 hour, and air cooling.
- the present invention adopts a nickel-reducing alloy design and adopts a normalizing rolling + two-phase zone quenching + tempering production process, and its performance fully meets the GB 3531-2014 9Ni standard in low-temperature pressure vessel steel. Greatly reduce production costs.
- the present invention may also have other embodiments. All technical solutions formed by equivalent replacements or equivalent transformations fall within the protection scope of the present invention.
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Abstract
Description
Claims (5)
- 一种LNG储罐用7Ni钢板,其特征在于,其化学成分及质量百分比如下:C:0.02%~0.06%,Si:0.20%~0.35%,Ni:4.0%~8.0%,Mn:0.3%~0.7%,P≤0.005%,S≤0.005%,Al:0.03%~0.05%,Nb:0.02%~0.05%,Cr:0.2%~0.4%,余量为Fe和不可避免杂质。
- 根据权利要求1所述的一种LNG储罐用7Ni钢板,其特征在于:厚度为8~30mm。
- 一种LNG储罐用7Ni钢板生产工艺,其特征在于:包括铸坯制备:按化学组成配成冶炼原料,在真空冶炼炉中进行冶炼,浇铸成铸锭,然后将铸锭锻压成方形铸坯,在避风处空冷;正火轧制:将铸坯在1150~1250℃保温2~3h;对铸坯进行两阶段轧制,其中粗轧的开轧温度为1000~1100℃,总压缩比为40%~60%,精轧的开轧温度为850~900℃,总压缩比为40%~70%,终轧温度750~850℃,然后空冷;两相区淬火+回火:将轧制后的钢板在600~700℃淬火至300℃以下,再在500~580℃回火,回火速率为5~20℃/s,保温0.5~2h,空冷。
- 根据权利要求3所述的一种LNG储罐用7Ni钢板生产工艺,其特征在于:钢板的化学成分及质量百分比如下:C:0.05%,Si:0.25%,Mn:0.60%,Ni:7.2%,P:0.0045%,S:0.0030%,Al:0.038%,Cr:0.28%,Nb:0.043%,余量为Fe和不可避免杂质;铸坯制备:按化学组成配成冶炼原料,在真空冶炼炉中进行冶炼,浇铸成铸锭,然后将铸锭锻压成厚度为80mm的方形铸坯,在避风处空冷;正火轧制:将铸坯送至加热炉,加热至1156℃,保温2.6h,取出进行轧制;对铸坯进行两阶段轧制,其中粗轧在奥氏体完全再结晶区轧制,开轧温度为1100℃,压下量为60%,精轧在奥氏体未再结晶区轧制,开轧温度 为900℃,压下量为63%,终轧温度790℃,然后空冷,形成12mm厚热轧钢板轧;两相区淬火+回火:将轧制后的钢板在660℃淬火至300℃以下,再在560℃回火,回火速率为10℃/s,保温1h,空冷。
- 根据权利要求3所述的一种LNG储罐用7Ni钢板生产工艺,其特征在于:钢板的化学成分及质量百分比如下:C:0.06%,Si:0.23%,Mn:0.55%,Ni:7.3%,P:0.0043%,S:0.0031%,Al:0.035%,Cr:0.25%,Nb:0.040%,余量为Fe和不可避免杂质;铸坯制备:按化学组成配成冶炼原料,在真空冶炼炉中进行冶炼,浇铸成铸锭,然后将铸锭锻压成厚度为80mm的方形铸坯,在避风处空冷;正火轧制:将铸坯送至加热炉,加热至1239℃,保温2.1h,取出进行轧制;对铸坯进行两阶段轧制,其中粗轧在奥氏体完全再结晶区轧制,开轧温度为1100℃,压下量为60%,精轧在奥氏体未再结晶区轧制,开轧温度为900℃,压下量为45%,终轧温度790℃,然后空冷,形成18mm厚热轧钢板轧;两相区淬火+回火:将轧制后的钢板在660℃淬火至300℃以下,再在560℃回火,回火速率为10℃/s,保温1h,空冷。
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JP7367896B1 (ja) * | 2022-05-19 | 2023-10-24 | Jfeスチール株式会社 | 鋼板およびその製造方法 |
WO2023223694A1 (ja) * | 2022-05-19 | 2023-11-23 | Jfeスチール株式会社 | 鋼板およびその製造方法 |
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JP7367896B1 (ja) * | 2022-05-19 | 2023-10-24 | Jfeスチール株式会社 | 鋼板およびその製造方法 |
WO2023223694A1 (ja) * | 2022-05-19 | 2023-11-23 | Jfeスチール株式会社 | 鋼板およびその製造方法 |
CN115747652A (zh) * | 2022-11-15 | 2023-03-07 | 北京科技大学 | 一种节镍型LNG储罐用含Nb7Ni超低温钢及其热处理工艺 |
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CN110129676A (zh) | 2019-08-16 |
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JP7340627B2 (ja) | 2023-09-07 |
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