Method for hot dip galvanizing of AHSS or UHSS strip material, and such material
AssigneeTata Steel Ijmuiden B.V.
InventorsHendrik Bart Van Veldhuizen, Petrus Gerardus Commadeur
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Abstract
A method for hot dip galvanizing of advanced high strength or ultra high strength steel strip material, such as dual phase steel, transformation induced plasticity steel, transformation induced plasticity assisted dual phase steel and twinning induced plasticity steel strip material. The strip material is pickled and thereafter heated to a temperature below the continuous annealing temperature before the strip material is hot dip galvanized.
Claims20
Method for hot dip galvanizing of dual phase steel, transformation induced plasticity steel, transformation induced plasticity assisted dual phase steel or twinning induced plasticity steel strip material comprising,
- pickling the strip material and thereafter heating the pickled strip material to a temperature below a continuous annealing temperature of the strip material, between 400 and 600° C., before the strip material is hot dip galvanized;
- wherein Fe in the strip material is reduced during or after the heating to a temperature below the continuous annealing temperature and before the hot dip galvanizing;
- hot dip galvanizing the strip material after said heating, wherein the reduction is performed using H2N2 in the reducing atmosphere.
Method for hot dip galvanizing of dual phase steel, transformation induced plasticity steel, transformation induced plasticity assisted dual phase steel or twinning induced plasticity steel strip material comprising,
- pickling the strip material and thereafter heating the pickled strip material to a temperature below a continuous annealing temperature of the strip material, between 400 and 600° C., before the strip material is hot dip galvanized;
- wherein Fe in the strip material is reduced during or after the heating to a temperature below the continuous annealing temperature and before the hot dip galvanizing;
- hot dip galvanizing the strip material after said heating, wherein the reduction is performed using 5-30% H2N2 in the reducing atmosphere.
Dependencies are inferred from the claim text.