HIGH-ALLOY STEEL AND METHOD FOR PRODUCING PIPES FROM SAID STEEL BY MEANS OF INTERNAL HIGH-PRESSURE SHAPING

摘要

The invention relates to a high-alloy steel, in particular for producing pipes shaped by means of internal high pressure, having high cold formability, TRIP and/or TWIP properties, a partially or completely austenitic microstructure having at least 5% residual austenite, and having the following chemical composition (in wt%): Cr: 7 to 20; Mn: 2 to 9; Ni: up to 9; C: 0.005 to 0.4; N: 0.002 to 0.3; the remainder being iron including unavoidable steel-accompanying elements, with optional addition of the following elements (in wt%): Al: 0 to 3; Si: 0 to 2; Mo: 0.01 to 3; Cu: 0.005 to 4; V: 0 to 2; Nb: 0 to 2; Ti: 0 to 2; Sb: 0 to 0.5; B: 0 to 0.5; Co: 0 to 5; W: 0 to 3; Zr: 0 to 2; Ca: 0 to 0.1; P: 0 to 0.6; S: 0 to 0.2. The invention further relates to a method for producing pipes from said steel, said pipes being shaped by means of internal high pressure.