Metal coated steel strip

Abstract

A steel strip that has a coating of an Al—Zn—Si alloy that contains 0.3-10 wt. % Mg and 0.005-0.2 wt. % V.

1 . A cold rolled steel strip that has a corrosion-resistant coating of an Al—Zn—Si—Mg alloy providing galvanic protection, the coating containing the following ranges in % by weight of the elements Al, Zn, Si, Mg and V:
 Al: 45 to 60%; 
 Zn: 35 to 60%; 
 Si: 1.2 to 2.5%; 
 Mg: 1.0 to 3.0%; and 
 V: 0.03 to 0.2%, 
 wherein the V is present in the range of 0.03 to 0.2% as a deliberate alloy addition and not as an unavoidable impurity. 
 
     
     
         2 . The steel strip defined in  claim 1  wherein the alloy coating contains less than 0.15 wt. % V. 
     
     
         3 . The steel strip defined in  claim 1  wherein the alloy coating contains less than 0.1 wt. % V. 
     
     
         4 . The steel strip defined in  claim 1  wherein the alloy coating contains other elements present as unavoidable impurities and/or as deliberate alloy additions. 
     
     
         5 . The steel strip defined in  claim 1  wherein the alloy coating is a single layer. 
     
     
         6 . A cold formed end-use product comprising the steel strip defined in  claim 1 .