High strength thin steel material for API having excellent resistance to deformation and method of manufacturing same

A method of manufacturing a steel material, the method comprising:

• reheating a slab including, by weight %, C:
• 0.05-0.15%, Si:
• 0.5% or less (excluding 0%), Mn:
• 0.5-2.5%, Nb:
• 0.05% or less (excluding 0%), V:
• 0.004% or less (excluding 0%), Mo:
• 0.03-0.2%, Cr:
• 0.1-0.3%, P:
• 0.03% or less (excluding 0%), S:
• 0.015% (excluding 0%), Al:
• 0.05% or less (excluding 0%), N:
• 0.01% or less (excluding 0%), and a balance of Fe and other inevitable impurities at 1200-1400° C.,
• obtaining a hot-rolled steel material by rough-rolling the reheated slab and finishing-rolling the slab at an austenite single-phase temperature;
• water-cooling the hot-rolled steel material to a temperature of 650-750° C. at a rate of 40-60° C./sec and air-cooling the steel material for 3-7 seconds;
• and
• water-cooling the air-cooled hot-rolled steel material to a temperature of 450-600° C. at a rate of 30-50° C./sec and winding the steel material.