Hot coil for line pipe use and method of production of same

A method of production of hot coil for line pipe use characterized by heating a steel slab which has a chemical composition which contains, by mass %,

• C:
• 0.03 to 0.10%,
• Si:
• 0.01 to 0.50%,
• Mn:
• 0.5 to 2.5%,
• P:
• 0.001 to 0.03%,
• S:
• 0.0001 to 0.0030%,
• Nb:
• 0.0001 to 0.2%,
• Al:
• 0.0001 to 0.05%,
• Ti:
• 0.0001 to 0.030%, and
• B:
• 0.0001 to 0.0005% and
• which has a balance of iron and unavoidable impurities to 1000 to 1250° C., then hot rolling it, during which making a draft ratio in a recrystallization temperature range 1.9 to 4.0 and making the steel plate in the middle of the hot rolling stop at least once between rolling passes in the recrystallization temperature range for 100 to 500 seconds, and cooling the obtained hot rolled steel plate divided between a front stage and a back stage, during which, in the front stage cooling, cooling by a cooling rate of 0.5 to 15° C./sec at a center part of plate thickness of the hot rolled steel plate until a surface temperature of said hot rolled steel plate becomes 600° C. from the cooling start temperature of the front stage, and, in the back stage cooling, cooling by a cooling rate which is faster than the front stage at the center part of plate thickness of the hot rolled steel plate.