OTA Shusaku,SHIMAMURA Junji,ISHIKAWA Nobuyuki,ENDO Shigeru,YASUDA Kyono
申请号：
US201615560600
公开号：
US2018057905(A1)
申请日:
2016.03.25
申请国别(地区):
美国
年份:
2018
代理人:
摘要：
Disclosed is, as a high-strength steel plate of API X100 grade or higher, a steel plate for structural pipes or tubes that exhibits high strength in a rolling direction and that has only a small difference between strength in a rolling direction and strength in a direction perpendicular to the rolling direction (exhibiting high material homogeneity) without addition of large amounts of alloying elements. The steel plate for structural pipes or tubes disclosed herein has: a specific chemical composition; a microstructure mainly composed of bainite and containing martensite austenite constituent in an area fraction of less than 3.0%; a tensile strength in the rolling direction of 760 MPa or more; and TSC−TSL being 30 MPa or less in terms of absolute value, where TSC denotes a tensile strength in a direction perpendicular to the rolling direction.
