Heavy steel plate

A thick steel plate and quality technology, applied in the field of thick steel plate, can solve the problems of decreased productivity, increased number of processes, increased manufacturing cost, etc., to achieve the effect of good substrate toughness and improved uniform elongation

Inactive Publication Date: 2012-09-26
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0024] However, in the prior art, there were problems in that the number of steps increased due to the need for reheating, and therefore, the productivity decreased and the manufacturing cost increased.

Method used

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Examples

Experimental program
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Embodiment

[0121] (Example of the steel plate of the present first invention)

[0122] Smelt the steel with the composition shown in the following Tables 1 to 3 by a common melting method, and cool the molten steel from 1500°C to 1100°C at a cooling rate of 0.1 to 2.0°C / min to obtain a slab (slab thickness = 270mm ). Thereafter, hot rolling and quenching shown in Tables 4 and 5 were performed on this slab to obtain a steel plate with a thickness of 60 mm. In addition, Table 4 shows the conditions of quenching method A, and Table 5 shows the conditions of quenching method B. In addition, in Table 1, REM is added in the form of a rare earth metal alloy containing about 50% of La and about 25% of Ce. In addition, "-" in Tables 1-3 shows that no element was added. In addition, Tables 1 to 3 also show the P value ([Ti] / [N]) and Q value [1000×([Ca]+2×[S]+3×[O]) specified in the present invention.

[0123]

[0124]

[0125]

[0126]

[0127] The tensile properties of the various...

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Abstract

The invention provides a heavy steel plate which has good HAZ toughness, perfect uniform elongation and low yield ratio not only in high heat input welding with a welding heat input of 20 kj / mm, but also even in low heat input welding with a welding heat input of 5 kj / mm. The heavy steel plate has a properly-controlled chemical constituent and meets the formula (1) and (2), 1.0<=[Ti] / [N]<=2.5...(1), wherein [T1] and [N] is respectively the content of Ti and N (mass%); 2.0<=1000X([Ca]+2X[S]+3X[O])<=13.0...(2), wherein [Ca], [S] and [O] is respectively the content of Ca, S and O (mass%). The heavy steel plate meets the requirements that residual gamma volume fraction is 2-10%, the average equivalent circle diameter of the martensite islands (MA) is below 3.0 mum; or optionally the area fraction of the ferrite is 5-50%, the average equivalent circle diameter of the ferrite is below 100 mum and the average hardness of the hard phase is HV150-400.

Description

technical field [0001] The invention relates to a thick steel plate, which is suitable for welding structures such as buildings, ships, and marine structures. In particular, during high heat input welding, the heat-affected portion (hereinafter, sometimes referred to as "HAZ") has excellent toughness and excellent uniform elongation, or has a low yield ratio. Background technique [0002] Structures in various fields such as ships, buildings, and marine structures are usually constructed by joining steel materials by welding. From the viewpoint of ensuring safety, the steel materials used in such structures require not only the strength of the steel materials, but also the strength of the steel materials. The toughness of the welded part is good. [0003] In recent years, with the enlargement of welding structures, from the viewpoint of improving construction efficiency of structures and reducing construction costs, it is required to improve welding construction efficiency,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/16C22C38/28C22C38/30C22C38/32C22C38/38C22C38/50C22C38/52C22C38/54C22C38/58
Inventor 高冈宏行冈崎喜臣武田裕之
Owner KOBE STEEL LTD
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