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Welding heat influenced ductility-excellent high yield ratio high tension steel plate

A steel plate quality technology, applied in the field of high yield ratio and high tension steel plate, can solve the problems of high thermal energy HAZ good toughness and other issues

Inactive Publication Date: 2009-05-27
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, if the welding heat input increases, the coarsening of the prior austenite grains in the HAZ is also limited, and there are cases where the toughness of the high-heat energy HAZ cannot be improved only by the suppression of the coarsening of the prior austenite grains.

Method used

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  • Welding heat influenced ductility-excellent high yield ratio high tension steel plate
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  • Welding heat influenced ductility-excellent high yield ratio high tension steel plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Steel sheets were manufactured under the production conditions shown in Tables 3 and 4 below using steels having the chemical composition shown in Tables 1 and 2 below. In addition, in Tables 1 and 2, the HM value, HG value, and HB value prescribed for the present invention are also shown.

[0074]

[0075]

[0076] 【table 3】

[0077] experiment

No.

steel type

Add before rolling

heat temperature

(℃) rolling finished

into temperature

(℃) cold after rolling

Cooling speed (℃

/ Second) plate thickness

(m

m) tempering temperature

(℃)

1 A 1100 800 15 50 — 2 B 1100 710 4 100 — 3 C 1100 800 13 50 — 4 D 1280 850 14 50 500 5 E 1200 800 15 50 — 6 F 1100 750 13 50 — 7 G 1100 800 3 100 650 8 H 1000 730 6 80 — 9 I 1100 880 52 20 — 10 J 1100 800 11 50 — 11 K 1050 900 air cooling 6 — 12 A1 1100 800 14...

Embodiment 2

[0110] Using steel type A shown in the above-mentioned Table 1, the HAZ reproduction test was carried out in the same manner as above except that the heat input was changed. At this time, the cooling time to reach 800-500° C. was changed so that the input heat amount corresponded to 1-20 KJ / mm, and a thermal cycle test was performed. Also, when the input heat is 1KJ / mm, the cooling time is 10 seconds; when the input heat is 2KJ / mm, the cooling time is 20 seconds; when the input heat is 5KJ / mm, the cooling time is 40 seconds; when the input heat is 7KJ / mm, the cooling time is 60 seconds, when the input heat is 15KJ / mm, the cooling time is 120 seconds, and when the input heat is 20KJ / mm, the cooling time is 160 seconds.

[0111] Thereafter, two pendulum impact test pieces (JIS Z 2202 V notch test pieces) were extracted from each test piece, and the average impact absorbed energy vE at -15°C was obtained for each steel plate. -15 There are 10 in total.

[0112] Table 7 below sh...

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Abstract

A steel sheet of this invention can control chemical component properly, including following structure: as defined in formula (1) 0.10% C22C 38 / 28 C22C 38 / 38 C22C 38 / 50 C22C 38 / 58 0 18 1 2006 / 11 / 20 1970814 2007 / 5 / 30 100491575 2009 / 5 / 27 2009 / 5 / 27 2009 / 5 / 27 Kobe Steel Ltd. Japan Onishi Hirodo wanghui min 11021 The Patent Agency of the Chinese Academy of Sciences Inside the Chinese Academy of Sciences, No.52 Sanlihe Road, Fuwai, Beijing 100864 Japan 2005 / 11 / 22 2005-336682

Description

technical field [0001] The present invention relates to a high-yield-ratio high-strength steel plate with excellent toughness in a welded heat-affected zone (HAZ) and a tensile strength of 570 MPa or more. Background technique [0002] High-yield-ratio high-tensile steel sheets with a tensile strength of 570 MPa or more are used as raw materials for various building structures and bridges. Architectural objects and the like are constructed by welding high-tensile steel plates. However, as a characteristic required for high-tensile steel plates, it is necessary to have good toughness in the welding heat-affected zone (HAZ) when it is applied to high-heat-energy welding. [0003] In addition, for the application of the final yield point design for earthquakes, it is also required that the yield ratio [yield strength / tensile strength × 100(%)] is small (that is, the plastic deformation capacity is high), (but in the case of construction use, it is 80% hereinafter), from the vi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C22C38/38C22C38/50C22C38/58
CPCC22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/26C22C38/28
Inventor 大西宏道
Owner KOBE STEEL LTD
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