For the purpose of reducing alloys additions and then its cost of conventionally combined Nb-V microalloyed Q460 grade steel plates for construction, an HSLA steel alloying design with only V-N microalloying of 0.06%-0.08% V and free of niobium, and corresponding thermal mechanical controlled process were facilitated by better understanding the third generation TMCP concept and V-N microalloying technology. These resulted in the success of commercializing final gauges of 40 and 50mm V-N microalloyed Q460GJC steel plates with good combination properties of high strength greater than 470MPa and improved toughness of AKV at 0℃ larger than 150J, and low YS/UST ratio of 80% as well. Theoretical calculation shows that the contribution by fined-grain and precipitate strengthening amount to about 66% of yield strength of the newly developed plate steels.
Key words
V-N Microalloying /
TMCP /
Q460 /
Steel Plate
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References
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Footnotes
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