HSLA Steel with High Weldability and Improved Characterizations Obtained Through Vacuum Heated Ladle Refining Technique
Keywords:
Increasing the tensile characteristics for normalized steels commonly results in lowered weldability and toughness, because of additions of increasing content in Mn, Ni, V. The steel described herein allows to bypass this problem, i.e. to get at the same tim19 high yield strength (> 500 MPa) while keeping toughness and weldability comparable to that of steel with Y. S > 460 MPa. Two Conditions are necessary to achieve this :
- optimize the chemical composition through a computerized statistical analysis, linking together all needed properties (Y.S., impact strength, weldability) and cost. The additions of alloying elements are then reduced at the lowest level necessary for the requirements.
- use a steelmaking proce15s capable of high chemical composition accuracy. This is done by electric furnace melting followed by high vacuum heating ladle refining. Thus composition ranges obtained are very close to the aimed values.
It will be shown that it is important to choose the impurities level (S,P) and alloys additions (V) in accordance with the specification, to obtain the toughness value: in plates and in HAZ, before and after post weld heat treatment.
Author:
R. Blondeau, G. Pressouvre, J. Maniere, L. Cadiou
Affiiation
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Source:
Vanadium Structural Steels - Reprint of papers on vanadium steel from the proceedings of “ASM HSLA Steels Technology and Applications Conference, Philadelphia, USA, Oct., 1983, pp.107-112
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