Abstract: The present invention relates to a steel alloy with high energy absorption capacity and good formability, comprising beside inevitable impurities due to smelting and iron the following components in weight percent: C 0.05-0.6% Sum of Cr+2*Ti+3*(Mo+V+Nb)+4*W=2-7%, wherein the structure of the steel alloy comprises beside martensite portions of 10-40 Vol.-% retained austenite, wherein the energy absorption capacity expressed by the product of tensile strength (Rm) and uniform strain (Ag) is higher than 12,000 MPa % and the steel alloy has a minimal tensile strength of 1000 MPa. In addition, the invention relates to a steel tube product with high energy absorption capacity and good formability, which is characterized in that it at least partially consists of such a steel alloy.

Abstract: The present invention relates to a tube product, namely a perforating gun hollow carrier, consisting of a steel alloy with martensitic matrix, characterized in that it has a yield strength Rp0,2 of at least 900 MPa, and that the steel alloy besides iron and impurities caused by melting has the following alloying elements: C 0.15-0.6% Si 1.4-2.6% Cr 2.0-4.0% Mn 0.15-2.0% Mo 0.2-0.6% N<0015% and at least one of the alloying elements Nb, V and Ti in sum of ?0.01% and the tube product has been subjected to a quenching and partitioning heat treatment. Furthermore, the invention relates to a method of manufacturing such a tube product.

Abstract: The present invention relates to a gas generator pipe of an airbag module, the gas generator pipe consisting of a steel alloy with a martensitic matrix. The gas generator pipe is characterized in that the gas generator pipe has a tensile strength, Rm, of at least 1,100 MPa, and the steel alloy has the following alloying elements apart from iron and melt-related impurities in mass percent (Ma %): C 0.05-0.18% Si 0.4-2.6% Mn 0.2-1.4 % Cr 2.0-4.0% Mo 0.05-1.0% N <0.015% and at least one of the alloying elements Nb, V, Al and Ti in total at least 0.01%, the gas generator pipe has been subjected to a quenching and partitioning heat treatment and the gas generator pipe has a microstructure of martensite and austenite and the amount of austenite in the microstructure is at least 5%. Furthermore, the invention relates to a method of manufacturing such a gas generator pipe.

Abstract: The present invention relates to a steel alloy with high energy absorption capacity and good formability, comprising beside inevitable impurities due to smelting and iron the following components in weight percent: C 0.05-0.6% Sum of Cr+2*Ti+3*(Mo+V+Nb)+4*W=2-7%, wherein the structure of the steel alloy comprises beside martensite portions of 10-40 Vol.-% retained austenite, wherein the energy absorption capacity expressed by the product of tensile strength (Rm) and uniform strain (Ag) is higher than 12,000 MPa % and the steel alloy has a minimal tensile strength of 1000 MPa. In addition, the invention relates to a steel tube product with high energy absorption capacity and good formability, which is characterized in that it at least partially consists of such a steel alloy.