Título

BASIC ALLOY DESIGN CONCEPTS AND STEELMAKING/CASTING CONSIDERATIONS FOR OPTIMIZED HOT STRIP STRUCTURAL STEEL IN YIELD STRENGTHS FROM 300 – 700 MPA

Autoria

Stalheim, Douglas Glenn; Guzela, Danilo Di Napoli; Gorni, Antonio Augusto

DOI

10.5151/1982-9345-27545

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Resumo

Production of structural hot strip coils in yield strengths up to 700 MPa and higher is increasing worldwide. In addition to requiring higher strengths, structural designs require good formability, toughness and weldability. Toughness and formability come from optimization of ductility properties while weldability comes from lower carbon equivalent alloy designs. The key to the production of optimized cost effective hot strip produced structural coils is to create the correct balance of a proper alloy/processing design to create as fine and uniformly distributed cross sectional grain size as possible. In addition to the creation of the fine/uniformly distributed cross sectional grain size, the correct microstructure needs to be created. In the higher yield strength grades, not only does the grain size/distribution play a role but a proper understanding and control of microalloying precipitation kinetics is required. This paper will present various examples of hot strip alloy designs to produce cost effective hot strip structural coil in yield strengths up to 700 MPa with good ductility and weldability. In addition, steelmaking/casting parameters will be discussed to assure successful production. Optimized reheating, rolling and cooling parameters of these alloy designs will be introduced in an accompanying paper.

 

Palavras-chave

Microalloy, Niobium, Casting, Parameters

Parameters