Thick-specification high-tenacity X70 acicular ferrite pipe line steel and manufacturing method thereof
A kind of acicular ferrite, high toughness technology, applied in the direction of manufacturing tools, metal rolling, temperature control, etc., can solve the problem that pipeline steel can not meet the mechanical performance standards, meet the requirements of green and efficient production process, reduce the time in the furnace Effect
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[0024] The specific implementation of the X70 acicular ferritic pipeline steel will be described in detail below:
[0025] The smelting composition of the present invention is (percentage by weight): C: 0.03% to 0.06%, Si: 0.15% to 0.25%, Mn: 1.55% to 1.75%, P: 0.012% to 0.020%, S: ≤0.003%, Cu : 0.20% to 0.35%, Cr: 0.20% to 0.35%, Nb: 0.06% to 0.08%, Ti: 0.01% to 0.02%, Als: ≤0.05%, Mo: 0.20% to 0.30%.
[0026] The steel with the above composition is produced according to the following production process, molten iron pretreatment - LD converter smelting - out-of-furnace refining (RH desulfurization + LF vacuum degassing + wire feeding calcium treatment) - slab continuous casting (electromagnetic stirring) - slab direct Furnace entry - slab reheating - controlled rolling - controlled cooling - coiling.
[0027] Its process characteristics are as follows:
[0028] (1) Thickness of continuous casting slab: 135~170mm;
[0029] (2) Continuous casting speed: 1.2~1.8m / min;
[003...
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