Niobium micro-alloying gap-free hot rolled strip and manufacture method thereof
A technology of interstitial atoms and micro-alloying, applied in the manufacture of converters, etc., can solve problems such as uneven structure of hot-rolled steel strips, low deep-drawing properties of cold-rolled steel strips, and poor plasticity
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Embodiment 1
[0047] The thickness of the niobium microalloyed interstitial-free hot-rolled steel strip of this embodiment is 3.0mm, and the mass percentage ratio of the chemical composition is:
[0048] C: 0.0015 N: 0.0019 Si: 0.009 Mn: 0.13 P: 0.006
[0049] S: 0.004 Al: 0.05 Nb: 0.016 Cr: 0.01 Ni: 0.01
[0050] Cu: 0.01 Mo: 0.001, and the rest are Fe and unavoidable impurities.
[0051] The niobium microalloyed IF hot-rolled steel strip of this embodiment is sampled according to the GB / T 2975 standard, and the tensile properties are tested according to the GB / T 228 standard. The test results: the lower yield strength ReL: 225MPa, the tensile strength Rm: 310MPa, after breaking Elongation A: 48.5%. The hot-rolled steel strip in this embodiment is sampled according to the GB / T 2975 standard, and the cold-bending performance is tested according to the GB / T 232 standard. The test result shows that the 180°d=0 cold-bending sample is intact.
Embodiment 2
[0053] The thickness of the niobium microalloyed interstitial-free hot-rolled steel strip of this embodiment is 4.0 mm, and the mass percentage ratio of the chemical composition is:
[0054] C: 0.0013 N: 0.0018 Si: 0.01 Mn: 0.145 P: 0.007
[0055] S: 0.0035 Al: 0.043 Nb: 0.014 Cr: 0.01 Ni: 0.01
[0056] Cu: 0.01 Mo: 0.0023, and the rest are Fe and unavoidable impurities.
[0057] The niobium microalloyed IF hot-rolled steel strip of this embodiment is sampled according to the GB / T 2975 standard, and the tensile properties are tested according to the GB / T 228 standard. The test results are: lower yield strength ReL: 210MPa, tensile strength Rm: 300MPa, after fracture Elongation A: 51.5%. The above-mentioned IF hot-rolled steel strip is sampled according to GB / T2975 standard, and the cold-bending performance is tested according to GB / T 232 standard. The test result shows that the 180°d=0 cold-bending sample is intact.
Embodiment 3
[0059] The mass percentage ratio of the chemical composition of the interstitial-free hot-rolled steel strip with a thickness of 5.0 mm is:
[0060] C: 0.0012 N: 0.0015 Si: 0.005 Mn: 0.149 P: 0.0063
[0061] S: 0.0045 Al: 0.051 Nb: 0.0146 Cr: 0.015 Ni: 0.013
[0062] Cu: 0.01 Mo: 0.0022, and the rest are Fe and unavoidable impurities.
[0063] The niobium microalloyed IF hot-rolled steel strip of this embodiment is sampled according to the GB / T 2975 standard, and the tensile properties are tested according to the GB / T 228 standard. The test results: the lower yield strength ReL: 185MPa, the tensile strength Rm: 290MPa, after breaking Elongation A: 55.5%. The above-mentioned IF hot-rolled steel strip is sampled according to GB / T2975 standard, and the cold-bending performance is tested according to GB / T 232 standard. The test result shows that the 180°d=0 cold-bending sample is intact.
[0064] Manufacturing method embodiment one
[0065] What the present embodiment manufact...
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