23-06-2023 дата публикации
Номер: CN116287983A
Автор:
WANG JIANJING,
LIU CHENGBAO,
NING WEI,
ZHANG YUANHUA,
XU RONGCHANG,
LIU YANLIN,
LIU CHAO,
WANG LI,
SHAO ZHENGWEI,
SUN ZONGHUI,
WANG YI,
ZHANG SIXUN,
LYU XIAOFENG
Принадлежит:
The invention relates to the technical field of metallurgy, in particular to extremely-low Nb hot-rolled Q355B low-alloy H-shaped steel and a preparation method thereof.The extremely-low Nb hot-rolled Q355B low-alloy H-shaped steel comprises, by mass, 0.14%-0.20% of C, 0.15%-0.25% of Si, 1.15%-1.30% of Mn, 0.005%-0.011% of Nb, smaller than or equal to 0.018% of P, smaller than or equal to 0.015% of S, smaller than or equal to 0.004% of O, smaller than or equal to 0.002% of RE and the balance Fe and inevitable impurities. Compared with the prior art, the Nb content is lower, precipitates are finer and more dispersed, and the precipitation strengthening effect is better; and trace rare earth elements are added to perform deformation treatment on inclusions, so that the cleanliness and toughness of the product are improved, and the raw material cost is greatly reduced. And meanwhile, in the preparation method, the rolling mill load is small, the production rhythm is fast, and the production ...
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