HIGH STRENGTH MULTI-PHASE STEEL, AND METHOD FOR PRODUCING A STRIP FROM SAID STEEL
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Abstract
A high-strength multiphase steel with minimum tensile strengths of 580 MPa, preferably having a dual-phase structure for a cold-rolled or hot-rolled steel strip with improved forming properties, particularly for lightweight vehicle construction contains the elements (contents in mass-%): C 0.075 to ≦0.105; Si 0.600 to ≦0.800; Mn 1.000 to ≦2.250; Cr 0.280 to ≦0.480; Al 0.010 to ≦0.060; P≦0.020; N≦0.0100; S≦0.0150, remainder iron, including typical steel-accompanying elements not mentioned above, which are impurities introduced by smelting, with the condition that the Mn content is preferably ≦1.500% for strip thicknesses up to 1 mm, the Mn content is preferably ≦1.750% for strip thicknesses of 1 to 2 mm, and the Mn content is preferably ≧1.500% for strip thicknesses ≧2 mm
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Citations
33 Claims
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1-16. -16. (canceled)
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17. A high strength multiphase steel with minimal strengths of 580 MPa preferably with dual phase microstructure for a cold or hot rolled steel strip having improved forming properties, in particular for the vehicle lightweight construction, composed of the following elements weight %:
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C 0.075 to ≦
0.105Si 0.600 to ≦
0.800Mn 1.000 to ≦
2.250Cr 0.280 to ≦
0.480Al 0.010 to ≦
0.060P≦
0.020N≦
0.0100S≦
0.0150remainder iron including usual steel accompanying elements not mentioned above which constitute smelting related impurities, with the proviso that at strip thicknesses up to 1 mm the Mn content is preferably ≦
1.500%, that at strip thicknesses from 1 mm to 2 mm the Mn content is preferably ≦
1.750%, and that at strip thicknesses 2 mm the Mn content is preferably ≧
1.500%. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification