Acid resistant, high-strength steel suitable for polishing

Claim 2

A high strength steel, suitable for polishing and acid-resistant cohesion, consisting essentially of, besides iron and the usual residual elements, 0.04 to 2% (by weight) of C, 0.1 to 1% (by weight) of Si, 0.1 to 5% (by weight) of Mn, at least 5% (by weight) of Cr, at most 12% (by weight) of Ni, 0.01 to 4% (by weight) of Cu, 0.05 to 3% (by weight) of Mo, 0.005 to 0.6% (by weight) of N, 0.005 to 0.25% (by weight) of Zr or Be or their mixture, 0.001 to 0.2% (by weight) of Al, 0.04 to 1.5% (by weight) of Nb or V or their mixture, 0.001 to 0.01% (by weight) of Ca and at least 0.001 (by weight) of B or Ce or their mixture.

Claim 3

A steel according to claim 1 consisting essentially of besides iron and the usual residual elements, the following components in the indicated proportions: ______________________________________ C 0.04-2% Mo 0.05-3% Mn 0.1-5% Cu 0.01-4% Si 0.1-1% Zr 0.005-0.25% S 0.01-0.10% Nb 0.04-1.5% Cr 5-15% V 0.04-1.5% Ni 0.05-12% Al 0.001-0.2% N 0.005-0.06% B 0.001-0.01% Ca 0.001-0.01% ______________________________________

Claim 4

A steel according to claim 1 consisting essentially of besides iron and the usual residual elements, the following components in the indicated proportions: ______________________________________ C 0.04-0.5% Mo 0.05-0.5% Mn 0.1-1% Cu 0.01-0.5% Si 0.1-1% Zr 0.005-0.25% S 0.01-0.10% Nb 0.04-0.1% Cr 5-15% V 0.04-0.1% Ni 0.05-1% Al 0.001-0.02% N 0.005-0.06% B 0.001-0.01% Ca 0.001-0.01% ______________________________________

Claim 5

A highly polished steel surface formed from the composition of claim 1.