Anti-deformation X80-X100 pipeline steel plate and manufacturing method thereof

2012 
The present invention discloses an anti-deformation X80-X100 pipeline steel plate and a manufacturing method thereof. The pipeline steel plate comprises the following components, by weight, 0.04-0.09% of C, 0.10-0.50% of Si, 1.0-2.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.05-0.11% of Nb, 0.010-0.025% of Ti, less than or equal to 0.30% of Mo, less than or equal to 0.40% of Cu, less than or equal to 0.50% of Ni, less than or equal to 0.40% of Cr, and the balance of Fe. The manufacturing method for the X80-X100 pipeline steel plate comprises: sequentially carrying out process treatments of control rolling, relaxation, pre-straightening and control cooling on a plate billet having corresponding chemical components of the anti-deformation X80-X100 pipeline steel plate described in the claim 1. The resulting pipeline steel plate of the present invention has characteristics of good toughness, good deformation resistance (low yield ratio, high stress ratio and high uniform elongation rate, wherein the yield ratio is less than or equal to 0.80, the Rt1.5/Rt0.5 is more than or equal to 1.13, and the uniform elongation rate is more than or equal to 10.5%), and very flat hot-rolled plate shape, and is especially suitable for petroleum natural gas pipeline engineering projects based on anti-strain design.
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