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07MnNiMoDR steel for low-temperature pressure vessel and texture control method of 07MnNiMoDR steel
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A pressure vessel and low-temperature technology, applied in the field of metallurgy, to achieve the effects of improving low-temperature impact toughness, improving compactness, and ensuring uniformity
Pending Publication Date: 2022-05-17
NANJING IRON & STEEL CO LTD
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[0007] Patent CN107267857A discloses a 07MnNiMoDR steel plate and its online quenching production method. The thickness of the produced steel plate is ≤50mm. The impact energy of 1 / 2 and 1 / 4 of the steel plate thickness is slightly different; at the same time, its composition design adds 0.1 to 0.2% Cr, and has higher requirements for on-line quenching process and equipment
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Embodiment 1
[0028] The thickness of this 07MnNiMoDR steel plate is 48mm, and the following composition ratio and production method are adopted. Ingredient content (wt) is:
[0029] C: 0.067%, Si: 0.211%, Mn: 1.508%, P: 0.007%, S: 0.0009%, Ni: 0.392%, Al: 0.036%, Mo: 0.270%, Nb: 0.029%, V: 0.046%, Ti: 0.0029%, Ca: 0.0019%, and the rest are Fe and residual elements.
[0030] The production method of this steel plate is as follows:
[0031] (1) Steelmaking process: S≤0.005% after molten iron pretreatment, P≤0.010% after deep converter desulfurization, S≤0.002% after LF deep desulfurization, ultra-low As, Sb, Sn, Pb, Bi, B residual element control , The smelting uses molten iron with qualified composition as the raw material, and alloys are added during the molten steelsmelting process to avoid the increase of residual elements. After the end of RH, the temperature of the molten steel is 1515°C. When reaching the continuous castingtundish, the superheat of the molten steel is controlle...
Embodiment 2
[0038] The thickness of this 07MnNiMoDR steel plate is 48mm, and the following composition ratio and production method are adopted. Ingredient content (wt) is:
[0039] C: 0.068%, Si: 0.212%, Mn: 1.509%, P: 0.0076%, S: 0.001%, Ni: 0.393%, Al: 0.037%, Mo: 0.271%, Nb: 0.030%, V: 0.047%, Ti: 0.0029%, Ca: 0.002%, and the rest are Fe and residual elements.
[0040] The production method of this steel plate is as follows:
[0041](1) Steelmaking process: S≤0.005% after molten iron pretreatment, P≤0.010% after deep converter desulfurization, S≤0.002% after LF deep desulfurization, ultra-low As, Sb, Sn, Pb, Bi, B residual element control , The smelting uses molten iron with qualified composition as the raw material, and alloys are added during the molten steel smelting process to avoid the increase of residual elements. After the end of RH, the temperature of the molten steel is 1518°C. When reaching the continuous castingtundish, the superheat of the molten steel is controlled ...
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Abstract
The invention discloses 07MnNiMoDR steel for a low-temperature pressure vessel and a texture control method of the 07MnNiMoDR steel, which adopts low-carbon, molybdenum and nickel alloying and niobium, vanadium, titanium and other composite microalloying design, and adopts a reasonable'subcritical quenching + tempering 'process to prepare the 07MnNiMoDR steel for the low-temperature pressure vessel. The results that the 07MnNiMoDR steel for the low-temperature pressure vessel is high in texture randomization degree, the grain orientation is relatively diffused, and the percentage content of each typical texture is relatively balanced are achieved, so that the toughness of the 07MnNiMoDR steel for the low-temperature pressure vessel is greatly improved, and the 07MnNiMoDR steel plate which is stable in performance, meets the standard requirement and can be used for authentication is produced.
Description
technical field [0001] The invention relates to a production process of a steel plate in the field of metallurgy, in particular to a container steel with uniform low-temperature performance in the full thickness direction and a production method thereof. Background technique [0002] Steel for cryogenic pressure vessels involves the exploitation and transportation of liquefied petroleum gas, liquid petroleum, liquid ammonia, liquid nitrogen, etc. With the development of the petrochemical industry, new processes and new equipment continue to appear. The liquefaction, separation, storage, transportation and application of gases have become common in various countries. The development of these low-temperature technologies and equipment has promoted the development of steel for low-temperature pressure vessels. With the needs of industrial development, the low temperature toughness of the core of the material has gradually become important. [0003] 07MnNiMoDR steel is a low-...
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