Normalized-condition delivered 180-200mm-thick EH36 steel plate and preparation method thereof

A technology of EH36, steel plate

Active Publication Date: 2016-08-10
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

2. There are no current norms and standards for pro

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  • Normalized-condition delivered 180-200mm-thick EH36 steel plate and preparation method thereof
  • Normalized-condition delivered 180-200mm-thick EH36 steel plate and preparation method thereof
  • Normalized-condition delivered 180-200mm-thick EH36 steel plate and preparation method thereof

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0041] Preparation method of extra thick EH36 steel:

[0042] (1) Select high-quality scrap steel as the raw material for smelting, use high-quality raw and auxiliary materials for steelmaking, and smelt two furnaces, each furnace is 50 tons. The molten steel is smelted in an electric furnace, LF refined, and VD refined in sequence, and cast into 4 steel ingots in a steady state, each 25 tons of steel ingots. The present invention uses 3 steel ingots among them as Examples 1 to 3 respectively. The section of the ingot is greater than 900mm to ensure that the compression ratio of the final product is greater than 4.5. Control five harmful residual elements in molten steel: S≤0.0030%, P 0.0070%, H 0.00012%, O 0.0010%, N 0.004%. Considering the requirement of fully floating inclusions and controlling the porosity and segregation inside the stee...

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Abstract

The invention relates to a normalized-condition delivered 180-200mm-thick EH36 steel plate and a preparation method thereof. Chemical components of the steel plate are based on the national standards GB712 or the classification society rule, wherein Al is utilized to substitute an element Ti while V with relatively high content is added. The preparation method comprises the following steps: electric furnace smelting, LF refining, VD refining, die casting, steel ingot heating, break-down rolling, controlled slow cooling, steel billet heating, rolling, normalizing treatment and the like, which are sequentially carried out. The obtained steel plate does not have an obvious gradient structure in a thickness direction, and the structure of the steel plate is mainly a mixed mixture which comprises ferrite pearlite supplemented by little bainite. A microscopic structure is fine and uniform, an average crystal size is 8-12 mum, yield strength ranges from 380 MPa to 430 MPa, tensile strength ranges from 550 MPa to 600 MPa, and ductility is proper. The steel plate has an impact toughness value greater than or equal to 60 J at a temperature of 40 DEG C at a 1/4 part and a 1/2 part, and has excellent comprehensive mechanical property.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to an extra-thick 180-200mm EH36 steel delivered in a normalizing state and a production method thereof. Background technique [0002] At present, when it comes to the safety of marine operations, offshore engineering companies still mainly import from abroad for extra-thick plates such as 180-200mm EH36, which are key parts. The main reason is that there are very few domestic enterprises capable of producing 180-200mm extra-thick steel plates. For the high-standard EH36 steel plate for marine engineering delivered in the normalized state, the domestic technical reserves are insufficient. [0003] At present, there are two main difficulties in the production of high-strength extra-thick steel plates for marine engineering: First, in order to meet the requirements of welding and low-temperature toughness, it is necessary to ensure the composition design of low ca...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/06C22C38/08C22C38/18C22C33/04C21D8/02C21D1/28
CPCC21D1/28C21D8/0226C21D8/0263C21D2211/005C21D2211/009C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/18C22C38/24Y02P10/20
Inventor 刘朝霞阮小江苗丕峰赵孚白云刘俊
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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