Steel plate with excellent inhibition of welding heat affected section and manufacturing method of the same

A kind of steel and all technologies, applied in the field of steel and its manufacturing method, can solve the problems of lack of research on the toughness of the base metal, the spread of brittle cracks in a wide range, and the destruction of structures, so as to achieve both toughness and brittle failure characteristics , Excellent resistance to fatigue crack growth, and the effect of preventing brittle fracture cracks

Inactive Publication Date: 2008-04-02
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that if the brittle cracks spread across a wide range, it will cause damage to the structure itself.
However, there is no known steel material that can suppress the propagation of brittle fracture cracks that have already occurred, and can also improve the HAZ toughness during high-heat welding.
[0012] In addition, as the toughness of the steel plate itself, it is especially required to be more excellent in low temperature (-40°C) toughness. However, in the above-mentioned technologies, although the improvement of HAZ toughness has been concentrated, there is no research on the issue of combining the toughness of the base metal.

Method used

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  • Steel plate with excellent inhibition of welding heat affected section and manufacturing method of the same
  • Steel plate with excellent inhibition of welding heat affected section and manufacturing method of the same
  • Steel plate with excellent inhibition of welding heat affected section and manufacturing method of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0239] The first invention of the present invention will be described in more detail by way of examples.

[0240] After primary refining of molten iron in a 240-ton converter, steel is tapped from the converter into a ladle, and secondary refining is performed while adjusting the composition and temperature. Here, in the ladle, the amount of dissolved oxygen shown in Table 1 below was adjusted according to the deoxidation method shown in Table 1 below. After that, elements were added in the order shown in Table 1 below. Next, the remaining alloying elements were added as needed, and finally the composition shown in Table 2 below was adjusted. Also, in the secondary refining, a RH type deoxidizing refining device is used to remove H and S, etc. In addition, the dissolved oxygen amount "-" of the chemical component No. 16 in Table 1 shows that it is below the quantitative limit.

[0241] In addition, in Table 1, La is added in the form of Fe-La alloy, Ce is added in the form ...

Embodiment 2

[0300] The second invention of the present invention will be described in more detail below by way of examples.

Embodiment 2-1

[0302] After primary refining of molten iron in a 240-ton converter, steel is tapped from the converter into a ladle, and secondary refining is performed while adjusting the composition and temperature.

[0303]In the ladle, the amount of dissolved oxygen shown in Table 9 below was adjusted according to the deoxidation method shown in Table 9 below. After that, elements were added in the order shown in Table 9 below. In Table 9, La is added in the form of Fe-La alloy, Ce is added in the form of Fe-Ce alloy, REM is added in the form of mixed rare earth containing about 50% of La and about 25% of Ce, and Ca is added in the form of Ni -Ca alloy, Ca-Si alloy, or Fe-Ca powder form is added, Zr is added in the form of Zr alone, and Ti is added in the form of Fe-Ti alloy. In addition, the dissolved oxygen amount "-" of No. 16 in Table 9 indicates that it is below the quantitative limit.

[0304] Next, the remaining alloying elements were added as needed, and finally the composition...

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Abstract

A steep contains at least one of the C: 0.03-0.18%, Si: 0.02-0.5%, Mn: 0.9-2.0%, N:0.003-0.01%, REM:0.001-0.1% and Ca: 0.0003-0.02%, and Zr: 0.001-0.05%, satisfying P: less than 0.02%, S: less than 0.015%, and Al: less than 0.01%. When measuring the composition of the oxide compounds contained in the steel as the single oxide compound for mass conversion, the total amount of the REM oxide compound and the CaO is more than 5%, the ZrO2 is more than 5%, and the compound is a composite tissue constituted by soft character and hard character, and the ratio (Hv1/Hv2) of the diamond pyramid hardness Hv1 of the hard character and the Hv2 of soft character is 1.5-5.0, and the equivalent circle diameter of the grain diameter of the soft character is less than 20 mum.

Description

technical field [0001] The present invention relates to a steel material having improved toughness of a portion affected by heat (hereinafter referred to as "welding heat-affected zone" or "HAZ") when welding steel materials used in bridges, high-rise buildings, ships, etc., In addition, it also relates to a steel material having improved resistance to fatigue crack growth under repetitive stress, brittle fracture initiation characteristics of the base material, brittle crack stop characteristics of the base material, or toughness of the base material, and a method for producing the same. Background technique [0002] The required properties of steel used in bridges and high-rise buildings, ships, etc. have become increasingly stringent in recent years, and in particular good toughness is required. These steel materials are generally joined by welding, but the original problem is that HAZ is easily affected by heat during welding, and the toughness is easily deteriorated. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C33/04
Inventor 大垣诚一出浦哲史泉学金子雅人高桥祐二
Owner KOBE STEEL LTD
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