The present invention relates generally to steel compositions, methods of manufacturing the compositions and using the compositions to produce rimfire ammunition cartridges. The steel compositions for use in the rimfire cartridges are processed through cold-rolling and annealing steps to create suitable physical properties.

A method for the manufacture of a TWIP steel is provided including: (A) feeding of a slab comprising by weight: 0.5<C<1.2%, 13.0?Mn<25.0%, S?0.030%, P?0.080%, N?0.1%, Si?3.0%, 0.051%?Al?4.0%, 0.1?V?2.5%, and on a purely optional basis, one or more of Nb?0.5%, ?B?0.005%, Cr?1.0%, Mo?0.40%, Ni?1.0%, Cu?5.0%, Ti?0.5%, 0.06?Sn?0.2%, the remainder of the composition being made of iron and inevitable impurities resulting from the elaboration, (B) reheating the slab and hot rolling the slab to provide a hot rolled slab, (C) coiling the hot rolled slab to provide a coiled slab, (D) first cold-rolling the coiled slab to provide a first cold rolled slab, (E) recrystallization annealing the first cold rolled slab such that an annealed steel sheet having an UTS.sub.annealed is obtained and (F) second cold-rolling the annealed steel sheet with a reduction rate CR % that satisfies the following equation A: 1216.472?0.98795*UTS.sub.annealed?(?0.0008*UTS.sub.annealed+1.0124)*CR %.sup.2+(0.0371*UTS.sub.annealed?29.583)*CR %.

A cold rolled and recovered TWIP steel sheet is provided having an austenitic matrix including by weight: 0.71<C<1.2%, 13.0Mn<25.0%, S0.030%, P0.080%, N0.1%, 0.1Si3.0%, 0.1V2.50%, and on a purely optional basis, one or more elements such as Cu5.0%, Al4.0%, Nb0.5%, B0.005%, Cr1.0%, Mo0.40%, Ni1.0%, Ti0.5%, 0.06Sn0.2%, the remainder of the composition being made of iron and inevitable impurities resulting from elaboration.

The present invention relates to an ultra-high strength, hot-dip galvanized steel sheet having excellent surface quality and coating adherence and to a method for manufacturing thereof, the ultra-high strength, hot-dip galvanized steel sheet comprising: 0.1-0.3% by weight carbon (C); 0.1-2.0% by weight silicon (Si); 0.005-1.5% by weight aluminum (Al); 1.5-3.5% by weight manganese (Mn); 0.04% by weight or less phosphorus (P) (excluding 0% by weight); 0.015% by weight or less sulphur (S) (excluding 0% by weight); 0.02% by weight or less nitrogen (N) (excluding 0% by weight); the balance being Fe; and other inevitable impurities, and further comprising 0.01 wt.% to 0.07 wt.% of at least one kind of element selected from the group consisting of bismuth (Bi), tin (Sn) and antimony (Sb).

Provided is an austenitic stainless steel foil that demonstrates a high degree of stretch formability and little deformation anisotropy with respect to stretch forming despite having a sheet thickness of 60 m or less. The austenitic stainless steel foil of the present invention has a sheet thickness of 5 m to 60 m, a recrystallization rate of 90% to 100%, and a texture in which the total of the area ratio of a crystal orientation in which the difference in orientation from the {112}<111> orientation is within 10, the area ratio of a crystal orientation in which the difference in orientation from the {110}<112> orientation is within 10, and the area ratio of a crystal orientation in which the difference in orientation from the {110}<001> orientation is within 10, in a measuring field thereof, is 20% or less.

A steel sheet for a can having high strength, excellent ductility, and good corrosion resistance, and a method for manufacturing the steel sheet. The steel sheet has a chemical composition containing, by mass %, C: 0.020% or more and 0.130% or less, Si: 0.04% or less, Mn: 0.10% or more and 1.20% or less, P: 0.007% or more and 0.100% or less, S: 0.030% or less, Al: 0.001% or more and 0.100% or less, N: more than 0.0120% and 0.0200% or less, Nb: 0.0060% or more and 0.0300% or less, and Fe and inevitable impurities. An absolute value of a difference in an amount of solid solution Nb between a region from a surface to a position located at of a thickness and a region from a position located at of the thickness to a position located at 4/8 of the thickness is 0.0010 mass % or more.

Provided is an austenitic stainless steel foil that demonstrates a high degree of stretch formability and little deformation anisotropy with respect to stretch forming despite having a sheet thickness of 60 m or less. The austenitic stainless steel foil of the present invention has a sheet thickness of 5 m to 60 m, a recrystallization rate of 90% to 100%, and a texture in which the total of the area ratio of a crystal orientation in which the difference in orientation from the {112}<111> orientation is within 10, the area ratio of a crystal orientation in which the difference in orientation from the {110}<112> orientation is within 10, and the area ratio of a crystal orientation in which the difference in orientation from the {110}<001> orientation is within 10, in a measuring field thereof, is 20% or less.

The present invention provides a bake-hardenable high-strength cold-rolled steel sheet having excellent bake hardenability, cold aging resistance, and deep-drawability, and reduced planar anisotropy, containing chemical components in % by mass of: C: 0.0010% to 0.0040%, Si: 0.005% to 0.05%, Mn: 0.1% to 0.8%, P: 0.01% to 0.07%, S: 0.001% to 0.01%, Al: 0.01% to 0.08%, N: 0.0010% to 0.0050%, Nb: 0.002% to 0.020%, and Mo: 0.005% to 0.050%, a value of [Mn %]/[P %] being in the range of 1.6 to 45, where [Mn %] is an amount of Mn and [P %] is an amount of P, an amount of C in solid solution obtained from [C %](12/93)[Nb %] being in the range of 0.0005% to 0.0025%, where [C %] is an amount of C and [Nb %] is an amount of Nb, with a balance including Fe and inevitable impurities, wherein the bake-hardenable high-strength cold-rolled steel sheet satisfies the following Equation (1), where X(222), X(110), and X(200) represent ratios of integrated intensity of X-ray diffraction of {222} plane, {110} plane, and {200} plane, respectively, being parallel to a plane located at a depth of plate thickness measured from the surface of the steel sheet, and the bake-hardenable high-strength cold-rolled steel sheet has tensile strength in the range of 300 MPa to 450 MPa.

A cold rolled and recovered TWIP steel sheet is provided having an austenitic matrix including by weight: 0.71<C<1.2%, 13.0Mn<25.0%, S0.030%, P0.080%, N0.1%, 0.1Si3.0%, 0.1V2.50%, and on a purely optional basis, one or more elements such as Cu5.0%, Al4.0%, Nb0.5%, B0.005%, Cr1.0%, Mo0.40%, Ni1.0%, Ti0.5%, 0.06Sn0.2%, the remainder of the composition being made of iron and inevitable impurities resulting from elaboration.