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Thick steel plate for welded structure having excellent strength and toughness in central region of thickness and small variation of properties through thickness and method of producing the same

A central area, thick steel plate technology, applied in the field of thick steel plates, can solve the problems of damage to the toughness of welded parts, increase production costs, etc., and achieve the effect of excellent strength and toughness, and small performance changes

Inactive Publication Date: 2009-01-14
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, due to the addition of a large amount of alloying elements, not only may increase the production cost, but also significantly impair the toughness of the welded part

Method used

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  • Thick steel plate for welded structure having excellent strength and toughness in central region of thickness and small variation of properties through thickness and method of producing the same
  • Thick steel plate for welded structure having excellent strength and toughness in central region of thickness and small variation of properties through thickness and method of producing the same
  • Thick steel plate for welded structure having excellent strength and toughness in central region of thickness and small variation of properties through thickness and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] In order to confirm the properties of the steel sheets produced according to the present invention, after tempering and cold rolling each flat steel ingot having the composition listed in Table 1 below, at a temperature between the non-recrystallization temperature and Ar3 associated with the respective compositions Hot rolling is performed at a cumulative reduction ratio of 40% or more, where the steel plate has a thickness of 50 mm or 100 mm. After rolling, in Ar 3 The cooling of the steel sheets was started at a temperature of +10°C or higher while controlling the cooling rate of the central region of each steel sheet to be 3°C / sec.

[0104] Table 1

[0105] Sample No.

C

Si

m

no

P

S

B

Ti

Nb

Cu

Ni

Cr

m

o

N

Ti /

N

CP

CS1

0.024

0.

34

1.5

3

0.00

7

0.0

03

0.00

11 ...

Embodiment 2

[0129] After tempering and cold-rolling flat steel ingots having the compositions of Invention Steels 1 to 11 listed in Table 1, they were rolled and cooled under the conditions listed in Table 3 below to form thick steel plates each having a thickness of 100 mm.

[0130] table 3

[0131] base

body

try

Sample

No

Tnr

(℃

)

Ar 3 (

℃)

reheat

temperature

(℃)

T4(

℃)

T5(

℃)

Finished

compression ratio

example

(%)

start

cool down

temperature

(℃)

finally

cool down

temperature

(℃)

cool down

speed

(℃ / sec)

IM1

IS2

876

785

1100

875

822

50

808

443

3.1

IM2

IS2

876

785

1000

842

816

45

803

452

3.2

IM3

IS2

8...

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Abstract

Disclosed herein is a thick steel plate for welded structure having excellent strength and toughness in a central region and exhibiting small variation in properties through thickness. The steel plate comprises 0.05 - 0.10 % of C, 0.10 - 0.5 % of Si, 1.3 - 1.7 % of Mn, 0.0005 - 0.0025 % of B; 0.005 - 0.03 % of Ti, 0.010 % or less of N, 0.005 - 0.03 % of Nb, 0.005 - 0.055 % of Sol. Al, and the balance of Fe and other unavoidable impurities, in terms of weight%, wherein a content ratio of Ti / N is 2.0 or more, and a CP represented by Expression 1 is 40 - 50. CP = 165 x %C + 6.8 x %Si + 10.2 x %Mn + 80.6 x %Nb + 9.5 x %Cu + 3.5 x %Ni + 12.5 x %Cr + 14.4 x %Mo ... (l).

Description

technical field [0001] The present invention relates to a thick steel plate for a welded structure having excellent strength and toughness in the central region of the thickness and showing a small change in properties throughout the thickness, and a manufacturing method thereof. More specifically, the present invention relates to a method of manufacturing a high-strength thick steel plate having excellent strength and toughness in the central region of the thickness, and showing a small change in properties throughout the thickness direction, and having Minimized yet assured solderability. Background technique [0002] Conventionally, high-strength steel sheets have been made in such a way that the so-called hardenability of steel is increased by adding a large amount of alloying elements. In this case, a large number of low-temperature structures such as martensite or bainite are formed in the steel through cooling treatment such as quenching and tempering treatment, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00
CPCC22C38/14C22C38/02C22C38/06C22C38/12C22C38/04
Inventor 金相镐李在起徐仁植朴忠载
Owner POHANG IRON & STEEL CO LTD
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