Steel material for line pipes, method for producing the same, and method for producing line pipe

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United States of America Patent

PATENT NO 12037666
APP PUB NO 20210032732A1
SERIAL NO

16965719

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Abstract

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A method for producing a steel material for line pipes including heating a steel having a specific composition to a temperature of 1000° C. to 1200° C.; performing hot rolling such that a cumulative rolling reduction ratio in a non-recrystallization temperature range is 60% or more, a cumulative rolling reduction ratio in a temperature range of (a rolling finish temperature +20° C.) or less is 50% or more, and a rolling finish temperature is the Ar3 transformation point or more and 790° C. or less; subsequently performing accelerated cooling from a temperature of the Ar3 transformation point or more, at a cooling rate of 10° C./s or more, to a cooling stop temperature of 200° C. to 450° C.; and then performing reheating such that the temperature of a surface of the steel plate is 350° C. to 550° C. and the temperature of the center of the steel plate is less than 550° C.

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Patent Owner(s)

Patent OwnerAddress
JFE STEEL CORPORATION2-3 UCHISAIWAI-CHO 2-CHOME CHIYODA-KU TOKYO 1000011 ?1000011

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hase, Kazukuni Tokyo, JP 41 93
Muraoka, Ryuji Tokyo, JP 4 9
Tanizawa, Akihiko Tokyo, JP 9 42
Yasuda, Kyono Tokyo, JP 10 23
Yokota, Tomoyuki Tokyo, JP 35 57

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