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Super-thick steel P460NL1 (L2) plate for pressure vessel and method for producing same

A technology for pressure vessels and extra-thick steel plates, which is applied to P460NL1 (L2) extra-thick steel plates for pressure vessels and their production fields, can solve problems such as low performance and complex processes

Active Publication Date: 2013-06-19
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process is relatively complicated, and the yield strength is above 410MPa, the tensile strength can only be around 560MPa, and the performance is relatively low

Method used

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  • Super-thick steel P460NL1 (L2) plate for pressure vessel and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The P460NL1 (L2) extra-thick steel plate used for the pressure vessel in this example, its chemical composition and the mass percentage of each composition are: C: 0.09, Si: 0.55, Mn: 1.30, P: 0.010, S: 0.003, microalloying elements ( V+Nb+Ti+Cr+Ni): ≤2.0, Als: 0.020~0.050, others are Fe and residual elements, wherein, the P460NL1 (L2) extra-thick steel plate for pressure vessels contains up to 5% ferrite Bainite-martensite structure.

[0042] The extra-thick steel plate preparation process includes the following steps:

[0043] a. KR molten iron pretreatment process: the molten iron at the station must remove the front slag and the rear slag to ensure that the thickness of the slag layer on the liquid surface is 20mm. After the molten iron is stirred and desulfurized by KR, the S content in the molten iron (according to the mass percentage) is guaranteed to be 0.005% to ensure desulfurization The period is 21min, and the desulfurization temperature drop is 20°C.

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Embodiment 2

[0054] The P460NL1 (L2) extra-thick steel plate used for the pressure vessel in this example, its chemical composition and the mass percentage of each composition are: C: 0.11, Si: 0.70, Mn: 1.4, P: 0.009, S: 0.0025, microalloying elements ( V+Nb+Ti+Cr+Ni): ≤2.0, Als: 0.020~0.050, others are Fe and residual elements, wherein, the P460NL1 (L2) extra-thick steel plate for pressure vessels contains up to 5% ferrite Bainite-martensite structure.

[0055] The preparation process of this extra-thick steel plate is basically the same as that of Example 1, the only difference being: in the KR molten iron pretreatment process step: the thickness of the slag layer on the liquid surface is guaranteed to be 18mm, and the mass percentage of molten iron S after KR stirring and desulfurization is 0.004% , the desulfurization period is 19min, and the desulfurization temperature drop is 18°C.

[0056] In the converter smelting process steps: the mass percentage of incoming molten iron S is 0....

Embodiment 3

[0063] The P460NL1 (L2) extra-thick steel plate used for the pressure vessel in this example, its chemical composition and the mass percentage of each composition are: C: 0.13, Si: 0.80, Mn: 1.45, P: 0.008, S: 0.002, microalloying elements ( V+Nb+Ti+Cr+Ni): ≤2.0, Als: 0.020~0.050, others are Fe and residual elements, wherein, the P460NL1 (L2) extra-thick steel plate for pressure vessels contains up to 5% ferrite Bainite-martensite structure.

[0064] The preparation process of the extra-thick steel plate is basically the same as that of Example 1, the only difference being: in the KR molten iron pretreatment process step: the thickness of the slag layer on the liquid surface is guaranteed to be 17mm, and the mass percentage of molten iron S after KR stirring and desulfurization is 0.003% , the desulfurization period is 18min, and the desulfurization temperature drop is 17°C.

[0065] In the converter smelting process steps: the mass percentage of incoming molten iron S is 0.0...

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Abstract

The invention discloses a super-thick steel P460NL1 (L2) plate for a pressure vessel. The super-thick steel P460NL1 (L2) plate is characterized by comprising the following chemical components in percentage by weight (wt%): 0.09-0.17% of C, 0.55-0.85% of Si, 1.30-1.70% of Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, less than or equal to 2.0% of micro-alloying elements including V, Nb, Ti, Cr and Ni, 0.020-0. 050% of Als and the balance of Fe and other residual elements. The super-thick steel P460NL1 (L2) plate is in a 5% ferrite containing bainite-martensite structure. Due to the reasonable design of the chemical components and the LF and VD refining processes, the purity of steel is guaranteed, due to the effective implementation of the processes of heating, rolling and normalizing, the super-thick steel P460NL1 (L2) plate with a thickness of 250mm, good performance and low detection defects is studied successfully. The yield strength of the super-thick steel P460NL1 (L2) plate disclosed by the invention is controlled to be 420-500MPa, the tensile strength is controlled to be 560-700Mpa, the elongation rate is controlled to be 17-25%, and the V-type transverse impact energy at 50 DEG C below zero is controlled to be 100-200J.

Description

technical field [0001] The invention relates to the field of steel production, in particular to a P460NL1 (L2) extra-thick steel plate for pressure vessels and a production method thereof. Background technique [0002] P460NL1 (L2) belongs to the European standard EN10028 medium normalizing weldable fine grain steel, which has the characteristics of high strength, good toughness, excellent low temperature toughness, wear resistance, corrosion resistance, etc. It is mainly used in petroleum, chemical industry, power station, boiler, etc. Industry, specifically used to make reactors, heat exchangers, separators, spherical tanks, oil and gas tanks, liquefied gas tanks, nuclear reactor pressure shells, boiler drums and other equipment and components. However, in recent years, the application range of P460NL1 (L2) has expanded, and the demand has continued to increase. Since P460NL1 (L2) not only requires high strength, but also requires good low-temperature impact toughness, the...

Claims

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Application Information

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IPC IPC(8): C22C38/08C22C38/12C22C38/14C22C38/24C22C38/26C22C38/28C22C38/38C22C38/40C22C38/46C22C38/48C22C38/50C22C38/58C21D8/02C21D1/28C21C7/076C21C7/10
CPCY02P10/20
Inventor 袁永旗朱书成许少普唐郑磊李忠波于飒李亮
Owner NANYANG HANYE SPECIAL STEEL CO LTD