Energy-storing container made of lightweight steel

Abstract

An energy-storing container is made of a lightweight steel having the following chemical composition (in wt %): C 0.04-2%; Mn 14-30%; Al 1.5-12%; Si 0.3-3%; Cr 0.12-6%, and additionally one or more of the following elements: Ti, V, Nb, B, Zr, Mo, Ni, Cu, W, Co, P, N, each at up to 5% and in total at up to 10%, wherein the remainder is Fe including common steel tramp elements, wherein the concrete alloy composition is selected in order to limit the a′-martensite fraction before or after a forming process to no more than 3%, with the stipulation that the a′-martensite equivalent according to 0.1*wt % Mn+wt % C+0.05*wt % Si is between 3.4 and 10.5.

What is claimed is: 
     
         1 .- 6 . (canceled) 
     
     
         7 . An energy-storing container made of a lightweight steel with the following chemical composition (in wt %):
 C 0.04-2%   Mn 14-30%   Al 1.5-12%   Si 0.3-3%   Cr 0.12-6%,   one or more elements selected from Ti, V, Nb, B, Zr, Mo, Ni, Cu, W, Co, P, and N, each up to 5% and in total up to 10%, wherein the remainder is Fe including common steel tramp elements, wherein the steel has an α′-martensite content before or after a deformation of the steel of maximally 3%, wherein an α′-martensite equivalent according to   0.1*wt % Mn+weight % C*wt % Al+0.05*wt % Si   is between 3.4 and 10.5.   
     
     
         8 . The Energy-storing container of  claim 8 , wherein the Cr content is in the range from 2 to 6%. 
     
     
         9 . The energy-storing container of  claim 8 , wherein the Cr content is in the range from 0.12 to <2%. 
     
     
         10 . The energy-storing container of  claim 8 , wherein the light construction steel used for manufacturing has a triplex structure with finely distributed kappa carbides and the following chemical composition (in wt %):
 C 0.5-1.2%   Mn 14-22%   Al 6-10%   Si 0.3-3%   Cr<4%.   
     
     
         11 . A lightweight steel for use for an energy-storing container with (in wt %):
 C 0.04-2%   Mn 14-30%   Al 1.5-12%   Si 0.3-3%   Cr 0.12-6%,   one or more elements selected from Ti, V, Nb, B, Zr, Mo, Ni, Cu, W, Co, P, and N, each up to 5% and in total up to 10%, wherein the remainder is Fe including common steel tramp elements, wherein the steel has an α′-martensite content before or after a deformation of the steel of maximally 3%, wherein an α′-martensite equivalent according to   0.1*wt % Mn+weight % C*wt % Al+0.05*wt % Si   is between 3.4 and 10.5.   
     
     
         12 . The lightweight steel of  claim 11 , wherein the Cr content is within the range from 2 to 6%. 
     
     
         13 . The lightweight steel of  claim 11 , wherein the Cr content is within the range from 0.12 to <2%. 
     
     
         14 . The lightweight steel of  claim 11 , characterized in that the light construction steel used for manufacturing has a triplex structure with finely distributed kappa carbides and the following chemical composition (in wt %):
 C 0.5-1.2%   Mn 14-22%   Al 6-10%   Si 0.3-3%   Cr<4%.   
     
     
         15 . The lightweight steel of  claim 11 , having an elongation at break A80 of >40% for producing complex structured containers by forming.