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Q460E steel plate with thickness larger than 120 mm and manufacturing method of steel plate

A technology of steel plate and grain size, applied in the field of extra-thick Q460E steel plate and its manufacturing

Active Publication Date: 2015-07-29
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above two patents are both extra-thick plates, and the strength level is Q460 (S460 European standard) according to the standard division requirements, the actual strength can only reach 400Mpa, and the thickness of the steel plate should be further increased to more than 120mm and normalized. To ensure that the yield strength of the steel plate is kept at 460Mpa and above, it is necessary to further optimize the existing steel plate and the manufacturing method of the steel plate

Method used

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  • Q460E steel plate with thickness larger than 120 mm and manufacturing method of steel plate
  • Q460E steel plate with thickness larger than 120 mm and manufacturing method of steel plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The thickness of the Q460E steel plate in this embodiment is 120 mm, and its chemical composition is calculated by mass percentage: C: 0.15%, Mn: 1.75%, Si: 0.4%, S: 0.01%, P: 0.015%, Nb: 0.045%, Ti: 0.018%, V: 0.08%, Al: 0.030%, N: ≤ 0.010%, O: ≤ 0.006%, Mo: ≤ 0.15%, Cu: 0.30%, Ni: 0.20%, Cr≤ 0.15%, Ca: 0.001%, the balance is Fe and unavoidable impurity elements.

[0028]The manufacturing process of the 120mm thick Q460E steel plate is to configure the smelting raw materials according to the chemical composition of the above-mentioned finished steel plate, and then go through KR molten iron pretreatment, converter smelting, LF refining, RH vacuum refining and continuous casting in sequence to produce a product that meets the chemical composition requirements, A continuous casting slab with a thickness of about 350mm. Reheat the continuous casting slab to 1235°C and keep it warm for 7 hours; after it comes out of the furnace, carry out two-stage rolling: the first stag...

Embodiment 2

[0031] The thickness of the Q460E steel plate in this embodiment is 125mm, and its chemical composition is calculated by mass percentage: C: 0.19%, Mn: 1.55%, Si: 0.20%, S: 0.008%, P: 0.01%, Nb: 0.05%, Ti: 0.018%, V: 0.10%, Al: 0.035%, N: ≤ 0.010%, O: ≤ 0.006%, Mo: ≤ 0.15%, Cu: 0.35%, Ni: 0.20%, Cr≤ 0.15%, Ca: 0.001%, the balance is Fe and unavoidable impurity elements.

[0032] The manufacturing process of the 125mm thick Q460E steel plate is to configure the smelting raw materials according to the chemical composition of the above-mentioned finished steel plate, and then go through KR molten iron pretreatment, converter smelting, LF refining, RH vacuum refining and continuous casting in sequence to produce a product that meets the chemical composition requirements, A continuous casting slab with a thickness of 370mm. Reheat the continuous casting slab to 1225°C and keep it warm for 8 hours; after it comes out of the furnace, carry out two-stage rolling: the first stage is r...

Embodiment 3

[0035] The thickness of the Q460E steel plate in this embodiment is 130 mm, and its chemical composition is calculated by mass percentage: C: 0.17%, Mn: 1.65%, Si: 0.20%, S: 0.005%, P: 0.01%, Nb: 0.04%, Ti: 0.018%, V: 0.14%, Al: 0.030%, N: ≤ 0.010%, O: ≤ 0.006%, Mo: ≤ 0.15%, Cu: 0.25%, Ni: 0.20%, Cr≤ 0.15%, Ca: 0.001%, the balance is Fe and unavoidable impurity elements.

[0036] The manufacturing process of the 130mm thick Q460E steel plate is to configure the smelting raw materials according to the chemical composition of the above-mentioned finished steel plate, and then go through KR molten iron pretreatment, converter smelting, LF refining, RH vacuum refining and continuous casting in sequence to produce a product that meets the chemical composition requirements, A continuous casting slab with a thickness of 370mm. Reheat the continuous casting slab to 1240°C and keep it warm for 7 hours; after it comes out of the furnace, carry out two-stage rolling: the first stage is ...

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Abstract

The invention discloses a Q460E steel plate with the thickness larger than 120 mm. The steel plate comprises the following chemical components in percentage by mass: 0.15-0.19% of C, 1.5 -1.75% of Mn, 0.20-0.50% of Si, less than or equal to 0.01% of S, less than or equal to 0.015% of P, 0.03-0.055% of Nb, 0.015-0.03% of Ti, 0.07-0.14% of V, less than or equal to 0.06% of Al, less than or equal to 0.010% of N, less than or equal to 0.006% of O, less than or equal to 0.015% of Mo, 0.25-0.35% of Cu, 0.15-0.25% of Ni, less than or equal to 0.3% of Cr, 0.0005-0.0015% of Ca and the balance of Fe and inevitable impurity elements. A manufacturing process of the steel plate comprises the following steps: smelting and continuous casting, reheating, rolling, DQ rapid cooling and automatic temperature returning, stack cooling and normalizing. The obtained steel plate is 120 mm or above in thickness, the yield strength of the steel plate is improved to 460 MPa or above and the grain size of the steel plate reaches 8.0 level or above.

Description

technical field [0001] The invention belongs to the field of Q460E steel plate manufacturing, and in particular relates to an extra-thick Q460E (S460NL) steel plate with a thickness exceeding 120 mm and a manufacturing method thereof. Background technique [0002] Domestic extra-thick steel plates generally refer to steel plates with a thickness exceeding 60mm. According to the different strengths of steel plates, extra-thick steel plates can be further divided into Q345 and below, Q390 and below, Q460 and below, Q550 and below, and Q690 and below level and above Q690 level. [0003] Extra-thick steel plates have different delivery states, mainly controlled rolling state, TMCP state delivery (including tempering treatment), normalizing state, quenched and tempered state, etc. [0004] The strength of the steel plate delivered in the normalizing state is obviously reduced after normalizing, so both the national standard GB1591-2008 and the European standard EN10024-2004 ment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C22C38/16C21D8/02
Inventor 蒋昌林李国忠林涛胡建国李经涛石艾来徐伟明
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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