Use of a duplex stainless steel object

A method of improving resistance to hydrogen induced stress corrosion of a solution-annealed object, the method comprising:

• making the object from a duplex stainless steel consisting of a composition in weight % (wt %):
• C
• less than or equal to 0.03;
• Si
• less than or equal to 0.5;
• Mn
• less than or equal to 1.0;
• Ni
• 5.0 to 7.0;
• Cr
• 22.0 to 26.0;
• Mo
• 2.5 to 4.5;
• N
• 0.1 to 0.2;
• P
• less than or equal to 0.03;
• S
• less than or equal to 0.03;
• Cu
• less than or equal to 0.3;
• Al
• less than or equal to 0.10;
• the balance being Fe and inevitable impurities;
• wherein the duplex stainless steel fulfills the equation of Cr+50N≤35, and
• wherein the duplex stainless steel has a ferrite phase content in the range of from 40% to 60% by volume and an austenite phase content in the range of 40 to 60% by volume, and
• wherein the object is used in sea water applications.