Strategic petroleum reserve tank steel plate based on oxide metallurgy and manufacturing method thereof

A manufacturing method and oxide technology, applied in the field of metallurgy, can solve the problem of difficulty in ensuring the quality and performance requirements of HAZ, and achieve the effects of improving low temperature impact toughness and strength

Active Publication Date: 2018-10-19
NORTHEASTERN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] From the second phase of the construction project of 100,000 cubic meters of oil storage tanks in China, domestic steel plates have been used successively. The invention patents such as application number 200810119502.0, application number 200810224734.2 and application number 201410791633.9 are the domestic oil storage tank steel plate production that was formed at that time and has been used until now. Mainstream technology, its main feature is that it adopts off-line quenching + tempering or TMCP + tempering process to produce steel plates with a thickness of 12-33mm, a yield strength of 490MPa, and a tensile strength of 610-730MPa. In terms of grain coarsening, the traditional fine TiN particle pinning austenite growth mechanism is adopted. With this mechanism, under the condition of reasonable and stable production process, although the steel plate can withstand a large heat input of 100kJ / cm Welding requirements, however, since TiN will start to dissolve when the temperature reaches 1350°C, when the temperature of the welding heat-affected zone reaches or exceeds 1400°C, the volume fraction of TiN dissolved will even reach 88%, resulting in the loss of most of the TiN particles Inhibiting the growth of austenite grains, if considering the process or chemical composition fluctuation factors that may occur during the actual operation of the steel plate production plant, it is difficult to ensure that each steel plate actually used in the oil storage tank construction base can meet the thermal requirements. The input reaches the HAZ quality and performance requirements under the welding condition of 100kJ / cm; therefore, the current status quo is that the oil storage tank construction unit has to strictly limit the heat input to weld under the condition of far below 100kJ / cm, resulting in a thickness greater than 25mm The longitudinal seam of the steel plate can only be made with X-shaped grooves, and the front and back sides are welded once respectively, but the single-sided single-pass welding of V-shaped grooves cannot be realized, which virtually increases the welding construction cost of the oil reserve depot by nearly 1. In addition, the maximum thickness of steel plates used for oil storage tanks of 100,000 cubic meters is only 33mm, while the maximum thickness of steel plates used for oil storage tanks of 150,000 cubic meters and above will reach 60mm. The input welding performance must also be enhanced by nearly double. Therefore, in order to improve the quality and performance level of domestic oil storage tank steel plates and meet the construction needs of large oil storage tanks of 150,000 cubic meters and above, it is urgent to solve the insurmountable problems of existing technologies. Research Development of thick-gauge steel plates for domestic oil storage tanks capable of withstanding welding heat input greater than 200kJ / cm and its production method

Method used

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  • Strategic petroleum reserve tank steel plate based on oxide metallurgy and manufacturing method thereof
  • Strategic petroleum reserve tank steel plate based on oxide metallurgy and manufacturing method thereof
  • Strategic petroleum reserve tank steel plate based on oxide metallurgy and manufacturing method thereof

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Effect test

Embodiment 1

[0041] Converter-LF-VD-continuous casting process is used to make 260mm continuous casting slab; the chemical composition of continuous casting slab contains C0.07%, Si 0.16%, Mn 1.45%, P 0.010%, S 0.003%, Ni 0.16 in mass percentage %, Cu0.18%, B 0.002%, Cr0.10%, Mo 0.08%, Nb 0.02%, Al 0.01%, N 0.004%, O 0.003%, Ti 0.015%, Mg0.003%, RE 0.001%, Ca 0.003%, the balance is Fe; its carbon equivalent C eq =C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15=0.07+1.45 / 6+(0.1+0.08+0) / 5+(0.16+0.18) / 15=0.37 ; When the molten steel arrives at the LF furnace for refining, the oxide metallurgy process is used to control the oxygen content ≤ 150ppm through silicon and manganese deoxidation, and then Ti, Mg, RE and Ca are added. The interval between the addition of the above components is ≤ 10min, and then the LF furnace Slagging, desulfurization and alloying, when the LF furnace refining is completed, control the slag to contain FeO+MnO≤1.5% by mass percentage;

[0042] After the continuous casting slabs are s...

Embodiment 2

[0054] Method is with embodiment 1, and difference is:

[0055] (1) The composition of the continuous casting billet contains C 0.08%, Si 0.20%, Mn 1.5%, P 0.010%, S0.003%, Ni 0.18%, B 0.002%, Cr 0.05%, Mo 0.1%, Nb by mass percentage 0.03%, Cu 0.08%, Al 0.02%, N 0.007%, O 0.006%, Ti 0.018%, Zr 0.010%, RE 0.001%, Ca 0.003%, the balance is Fe; C eq =C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15=0.08+1.5 / 6+(0.05+0.1+0) / 5+(0.18+0.08) / 15=0.38 ;

[0056] (2) When refining in the LF furnace, add Ti, Zr, RE and Ca after controlling the oxygen content to ≤150ppm;

[0057] (3) The yield strengths of three groups of steel plates for strategic oil storage tanks based on oxide metallurgy are 572MPa, 546MPa and 498MPa, the tensile strengths are 636MPa, 630MPa and 626MPa, the yield ratios are 0.90, 0.87 and 0.81, and the elongation They are 21%, 23% and 23% respectively, and the impact energy at -20°C is 239J, 258J and 189J respectively;

Embodiment 3

[0059] Method is with embodiment 1, and difference is:

[0060] (1) The thickness of the continuous casting slab is 300mm; the composition of the continuous casting slab contains C 0.09%, Si 0.3%, Mn 1.2%, P 0.011%, S 0.006%, Ni 0.20%, B 0.003%, Cr 0.3% by mass percentage %, Mo 0.08%, Nb 0.03%, Cu0.16%, N 0.007%, O 0.001%, Ti 0.022%, Zr 0.010%, Mg 0.003%, Ca 0.002%, Al0.025%; the balance is Fe; C eq =C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15=0.09+1.2 / 6+(0.3+0.08+0) / 5+(0.2+0.16) / 15=0.39 ;

[0061] (2) When refining in the LF furnace, after controlling the oxygen content to ≤150ppm, add Ti, Zr, Mg and Ca;

[0062] (3) The yield strengths of three groups of steel plates for strategic oil storage tanks based on oxide metallurgy are 568MPa, 556MPa and 499MPa, the tensile strengths are 636MPa, 632MPa and 626MPa, the yield ratios are 0.89, 0.88 and 0.80, and the elongations are respectively 21%, 23% and 24%, and the impact energy at -20°C is 219J, 238J and 259J, respectively.

[0063] The st...

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Abstract

The invention discloses a strategic petroleum reserve tank steel plate based on oxide metallurgy and a manufacturing method of the strategic petroleum reserve tank steel plate. The yield strength of the steel plate is large than or equal to 490 MPa, the tensile strength is 610-730 MPa, and the yield ratio is smaller than or equal to 0.90. The manufacturing method comprises the steps that a continuous casting billet is manufactured, heated for heat preservation, roughly rolled, finely rolled, directly quenched and cooled at the speed being larger than or equal to 50 DEG C/s, heated, tempered and subjected to air cooling. The steel plate is also applicable to manufacturing of large strategic petroleum reserve tanks with the volume being 100000 m<3>, 150000 m<3> or more; when the steel plateis subjected to large heat input welding when heat input is large than 200 KJ/cm, after welding, the welding heat affected zone -20 DEG C impact energy is not lower than 80 J; a two-face two-pass X-type welding way which sets limitations for 25-60 mm steel plates in existing petroleum reserve tank construction is expected to be changed into single-face single-pass V-type welding, welding labor hours can be reduced by one half almost, the petroleum reserve tank construction speed is remarkably improved, the strategic petroleum reserve tank building cost is greatly reduced, and the application and popularization prospect is quite good.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a strategic oil reserve tank steel plate based on oxide metallurgy and a manufacturing method thereof. Background technique [0002] Strategic oil reserves are crucial to ensuring national energy security. The first phase of my country's oil reserve construction has been completed in the four coastal cities of Zhenhai, Zhoushan, Dalian, and Huangdao at the end of 2008, initially forming a net import volume of about 30 days. The size of crude oil reserves. [0003] Usually 1 set 100,000m 3 A total of 1948.5 tons of steel are required for oil storage tanks, and the cost of the tank body plus the value of crude oil is as high as hundreds of millions of yuan. If an accident occurs, the consequences of economic losses and environmental pollution will be serious; therefore, the comprehensive performance requirements for oil storage tank steel plates It is high-strength,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/54C22C38/58C21D1/18C21D8/02
CPCC21D1/18C21D8/0226C21D8/0247C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 朱伏先方磊张思曹余良王丙兴吴俊平王昭东霍松波王国栋楚觉非
Owner NORTHEASTERN UNIV
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