Current Challenges in AHSS from Galvanizing Process to In-Use Applications
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Automotive industry requirements for steels capable of enabling increasingly fuel-efficient vehicles con- tinue to drive process technology of hot-dip lines worldwide. Advanced High Strength Steel and 3rd GEN zinc and zinc coated grades have reached stable and high process capability over the years. However, there is still much to be developed to increase their attractiveness to automobiles. Control of AHSS surface effects during annealing, use of computational tools to predict selective oxidation of alloy elements, decar- burization of AHSS, and better use of Zn-alloys bath properties to improve AHSS galvanizability are moti- vations for continuous research development. Zinc-coated hot press-forming (PHS) grades have reached commercialization. Tailor-processed PHS could increase the efficient use of steel in automotive. A key bar- rier to adopting advanced zinc-coated steels is the reported incidence of liquid metal embrittlement and other performance challenges on non-fusion joining of Zn-coated steels. Regarding surface quality, there is much to learn in terms of the surface texture of incoming material with potential of offering galvanizing lines different alternatives that can minimize furnaces and Zn oxide defects after coating. Challenges in Zn-coated production, including improvement in productivity, quality, energy saving, and light-weighting, will be detailed discussed in this paper.
Abstract
Automotive industry requirements for steels capable of enabling increasingly fuel-efficient vehicles con- tinue to drive process technology of hot-dip lines worldwide. Advanced High Strength Steel and 3rd GEN zinc and zinc coated grades have reached stable and high process capability over the years. However, there is still much to be developed to increase their attractiveness to automobiles. Control of AHSS surface effects during annealing, use of computational tools to predict selective oxidation of alloy elements, decar- burization of AHSS, and better use of Zn-alloys bath properties to improve AHSS galvanizability are moti- vations for continuous research development. Zinc-coated hot press-forming (PHS) grades have reached commercialization. Tailor-processed PHS could increase the efficient use of steel in automotive. A key bar- rier to adopting advanced zinc-coated steels is the reported incidence of liquid metal embrittlement and other performance challenges on non-fusion joining of Zn-coated steels. Regarding surface quality, there is much to learn in terms of the surface texture of incoming material with potential of offering galvanizing lines different alternatives that can minimize furnaces and Zn oxide defects after coating. Challenges in Zn-coated production, including improvement in productivity, quality, energy saving, and light-weighting, will be detailed discussed in this paper.
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