Method for improving Z-direction performance of Q390E thick plate with thickness of 50-80mm

A performance and plate technology, applied in the field of improving the Z-direction performance of Q390E thick plates with a thickness of 50-80mm, can solve the problems of long production cycle, unfavorable batch supply, high price, etc.

Active Publication Date: 2021-08-06
XINJIANG BAYI IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Relevant patents, the use of expensive Ni and Mo alloy design in the thick specification Q390E, or the use of normalizing furnace ...

Method used

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  • Method for improving Z-direction performance of Q390E thick plate with thickness of 50-80mm
  • Method for improving Z-direction performance of Q390E thick plate with thickness of 50-80mm

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Embodiment

[0013] Example: steel type Q390EZ35, slab thickness 250mm, pre-desulfurization treatment of molten iron→converter→LF+RH refining→250mm thick slab→heating→controlled rolling and controlled cooling→stack cold rolling to make 50~80mm medium plate, quantity 8 The tonnage is 121.3 tons, including 4 pieces of 50mm and 4 pieces of 80mm.

[0014] 1. Melting composition: C 0.085%; Mn 1.46%; Si 0.20%, S 0.0032%, P≤0.010%, Als0.028%, Nb 0.030%, Ti 0.04%.

[0015] 2. Converter tapping ladle slag washing, adding 8kg / t high-alkalinity synthetic slag, the composition of the synthetic slag contains by weight percentage: 60%≤CaO≤70%, BaO 15-20%, 02 ≤3.0%, 02 o 3 ≤4.5%, 2.0%≤Na 2 O≤4.1%, CaF2≤7.5%, MgO≤4%. Synthetic slag is added in two times, 1 / 3 of the total amount of synthetic slag is added to the ladle before tapping, and the alloy and deoxidizer are included in 1 / 4 of tapping, until 3 / 4 of tapping is completely added.

[0016] 3. The slab has a good low-magnification structure, with cen...

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Abstract

The invention discloses a method for improving Z-direction performance of a Q390E thick plate with the thickness of 50-80mm. The plate comprises the following chemical components, by weight, 0.07-0.10% of C, 1.4-1.50 % of Mn, 0.15-0.25% of Si, less than or equal to 0.005% of S, less than or equal to 0.015% of P, 0.020-0.04% of Als, 0.025-0.035% of Nb, 0.035-0.045% of Ti, less than or equal to 20PPM of T[O], less than or equal to 50PPM of N and less than or equal to 1.5PPM of H. The thickness of the plate ranges from 50-80mm. The whole process flow comprises the steps of molten iron pre-desulfurization treatment, converter treatment, LF and RH refining, 250mm thick plate blank treatment, heating, controlled rolling and controlled cooling and stack cooling. A converter tapping slag washing process is adopted, high-alkalinity synthetic slag is used, and the synthetic slag comprises the components, more than or equal to 60% and less than or equal to 70% of CaO, 15-20% of BaO, more than 0 and less than or equal to 3.0% of SiO2, more than 0 and less than or equal to 4.5% of Al2O3, more than 2.0% and less than or equal to 4.1% of Na2O, less than or equal to 7.5% of CaF2 and less than or equal to 4% of MgO. Casting powder used in the continuous casting process comprises the specific chemical components, by weight, 4.1-6.5% of C, 25-30% of CaO, 27-32% of SiO2, 5-10% of Na2O, 7-10% of TiC, 3-6% of TiO2, 5-8% of F, 7-15% of B2O3, less than or equal to 3% of Al2O3, 1-1.5% of MgO; less than or equal to 3% of MnO, less than 3% of Fe2O3; and less than 0.5% of H2O.

Description

technical field [0001] The invention relates to compositional design of steelmaking and clean steel control technology, in particular to a method for improving the Z-direction performance of a Q390E thick plate with a thickness of 50-80mm. Background technique [0002] According to the public papers of "Q390E" keyword query of CNKI, there is "Development and Production of Low-alloy High-strength Structural Steel Plate Q390E" (Tianjin Metallurgy, 2008 No. 4), the development thickness is less than 50mm, and Nb / V / Ti composite is used. Enhanced design; "Research and Application of Production Technology Based on 400mm Continuous Casting Billet Development of 120 mmQ390E" (Physical Test, Issue 4, 2018), the thickness of which is 120mmQ390E. [0003] According to the patent information comprehensive service platform "Z-direction performance" keyword query, the published patents are: a production process that guarantees the Z-direction performance pass rate of medium-thick steel pl...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C22C38/14C21C7/076B22D11/111C21D8/02
CPCC22C38/04C22C38/02C22C38/06C22C38/12C22C38/14C21C7/076B22D11/111C21D8/0226Y02P10/20
Inventor 秦军宋维兆陈晓山
Owner XINJIANG BAYI IRON & STEEL
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