A kind of 180-200mm thick eh36 steel plate delivered in normalized state and preparation method thereof

A technology of EH36 and steel plate, which is applied in the field of iron and steel metallurgy, can solve the problems of no current norms and standards for products, and achieve the effects of saving alloy costs, low residual elements, and high cleanliness of molten steel

Active Publication Date: 2017-09-26
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

2. There are no current norms and standards for products with a thickness of more than 150mm to follow

Method used

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  • A kind of 180-200mm thick eh36 steel plate delivered in normalized state and preparation method thereof
  • A kind of 180-200mm thick eh36 steel plate delivered in normalized state and preparation method thereof
  • A kind of 180-200mm thick eh36 steel plate delivered in normalized state and preparation method thereof

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Experimental program
Comparison scheme
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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

A normalized-condition delivered 180-200 mm-thick EH36 steel plate and a preparation method therefor. Chemical components of the steel plate are based on the national standard GB712 or classification society rules, Al is utilized to substitute the addition of element Ti, and a relative high content of V is added. The preparation method comprises: electric furnace smelting, LF refining, VD refining, die casting, ingot heating, cogging rolling, controlled slow cooling, billet heating, rolling, normalizing and the like that are performed in sequence. The obtained steel plate does not have an obvious gradient structure in a thickness direction. The steel plate employs a mixed structure mainly consisting of ferrite pearlite, supplemented by a small amount of bainite. Microscopic structures are fine and uniform and have an average grain size of 8-12 µm. The yield strength ranges from 380 MPa to 430 MPa, the tensile strength ranges from 550 MPa to 600 MPa, and the ductility is moderate. The steel plate has an impact toughness value greater than or equal to 60 J at a temperature of -40ºC at a 1 / 4 point and a 1 / 2 point, and has an 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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Patent Type & Authority Patents(China)
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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