Method of manufacturing pressure vessel steel with high...

Details Method of manufacturing pressure vessel steel with high... Method of manufacturing pressure vessel steel with high...

C - Chemistry, Metallurgy

21

D

148/34

C21D 8/00 (2006.01) C21D 1/02 (2006.01) C21D 1/18 (2006.01) C22C 38/00 (2006.01) C22C 38/54 (2006.01)

Patent

CA 1260367

ABSTRACT OF THE DISCLOSURE At first steel containing 0.03 ~ 0.12 wt.% of C, 0.10 ~ 0.8 wt.% of Si, 0.45 ~ 1.00 wt.% of Mn, 0.80 ~ 3.50 wt.% of Cr, 0.10 ~ 1.60 wt.% of Mo, 0.10 ~ 1.50 wt.% of Ni, 0.010 ~ 0.040 wt.% of soluble aluminum, either one or both of 0.05 ~ 0.40 wt.% of V and 0.02 ~ 0.20 wt.% of Nb, less than 0.010 wt.% of Ti, 0.0002 ~ 0.0010 wt.% of B and less than 0.004 wt.% of N, the balance of iron and impurities is prepared, wherein the quantities of N and Ti satisfy the following relation Image The steel is then heated to a temperature higher than 1200°C, rolled at a total reduction of more than 30% at a temperature higher than 1050°C, subjected to direct quenching, and finally tempered and/or PWHTed. The product has a high strength and a high toughness and is suitable for pressure vessels.

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