A kind of ultra-high impact toughness, high-purity low-temperature pressure vessel steel and its production method
A technology of impact toughness and pressure vessels, which is applied in the field of steel for high-purity low-temperature pressure vessels, can solve problems such as difficult to meet the requirements of strength and toughness stably, achieve excellent comprehensive mechanical properties, improve comprehensive mechanical properties, and stabilize overall mechanical properties Effect
Active Publication Date: 2019-09-03
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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Problems solved by technology
At present, the 09MnD steel commonly used in China is difficult to stably meet the above toughness requirements after normalizing, and can only ensure the safe use at -45°C. In order to ensure the safe use of pressure vessels at -50°C-55°C, it must be re- Design composition and optimize process
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Embodiment Construction
[0045] Such as figure 2 Shown, the chemical composition of the present invention and the comparative situation of 09MnD steel chemical composition.
[0046] And produce and prepare 4 groups of embodiments according to the following methods:
[0047] 1) Converter smelting: smelting in a top-bottom combined blowing converter with a capacity of more than 100 tons, using molten iron and high-quality scrap steel as raw materials for primary smelting to achieve pre-removal of P, adding synthetic refining slag, composite deoxidizer and various high-purity The alloy is pre-deoxidized and the composition is initially adjusted, and the slide plate is used to block the slag and leave the steel to prevent the steel from returning to P;
[0048] 2) Refining: Deep deoxidation and alloying of molten steel are carried out in an LF furnace of more than 100 tons, and the refining slag with alkalinity slag R=5~8 is formed, and the desulfurization and inclusion removal are strengthened through ...
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The invention discloses ultrahigh-impact-toughness high-purity-degree steel for a low temperature pressure vessel. The ultrahigh-impact-toughness high-purity-degree steel comprises the chemical components of, by mass, 0.06-0.08% of C, 0.20-0.35% of Si, 1.15-1.35% of Mn, 0.01-0.02% of Ti, 0.12-0.15% of Ni, 0.020-0.045% of Al, 0-0.010% of P, 0-0.003% of S, 0-0.0015% of [O], 0-0.0050% of [N], 0-0.00015% of [H] and the balance Fe. In this way, according to the ultrahigh-impact-toughness high-purity-degree steel for the low temperature pressure vessel and a production method thereof, the content ofthe C is decreased through precise control, strong deoxidization and crystalline grain refining are conducted through the Al, alloying is conducted through the Ni and the Ti, thus, compared with 09MnD steel of Q / TDGG 0040-2004, the ultrahigh-impact-toughness high-purity-degree steel is suitable for the lower medium temperature which is from -50 DEG C to -55 DEG C, and has higher low-temperature impact toughness, and the overall mechanical property of the ultrahigh-impact-toughness high-purity-degree steel is more stable.
Description
technical field [0001] The invention relates to the technical field of low-alloy steel in the iron and steel industry, in particular to a steel for ultra-high impact toughness and high-purity low-temperature pressure vessels and a production method thereof. Background technique [0002] Cryogenic pressure vessel is a kind of cryogenic vessel. The ferritic steel commonly used in pressure vessels, when the temperature drops to a certain temperature, reaches the brittle transition temperature, the toughness of the steel drops sharply, and it is easily broken. When the pressure vessel is used below the transition temperature, if there is local stress concentration in the vessel caused by defects, residual stress and other factors, the vessel is likely to undergo brittle fracture without obvious plastic deformation, resulting in catastrophic accident. [0003] For low-temperature pressure vessels, it is necessary to select suitable materials according to the application and the...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/08C22C38/06C21C7/06C21C7/10C21C7/072C21D8/06
CPCC21C7/0006C21C7/06C21C7/072C21C7/10C21D8/065C22C38/02C22C38/04C22C38/06C22C38/08C22C38/14Y02P10/20
Inventor 左辉翟万里郑力宁肖波印传磊许光乐石可伟谭利
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD