Tempering-free wear-resistant hot rolled strip and method for producing same

A method for producing a tempering-free wear-resistant hot rolled strip, the tempering-free wear-resistant hot rolled strip comprising the following components in percentage by weight:

• 0.08-0.22% of C, 0.1-0.55% of Si, 0.8-1.5% of Mn, less than or equal to 0.012% of P, less than or equal to 0.005% of S, 0.01-0.055% of Als, 0.005-0.019% of Ti, less than or equal to 0.007% of N, and the balance of Fe and impurities, and a structure is lath martensite;
• the method comprising the following steps:
• 1) desulfurizing molten iron, smelting the desulfurized molten iron, and casting into a blank;
• 2) heating the casting blank:
• wherein a heating temperature is controlled at 1220-1270° C., and the temperature is maintained for at least 60 min;
• a total duration in a furnace is controlled to be 140 min or more;
• and a temperature difference in a plate thickness direction is controlled to not exceed 5° C.;
• 3) performing rough rolling, wherein a rough rolling end temperature is controlled at 1050-1110° C., and a thickness of an intermediate plate after rough rolling is 30-50 mm;
• 4) performing finish rolling, wherein an initial rolling temperature is controlled at 950-1050° C., a rolling speed is controlled to be 2-7 m/s, and a final rolling temperature of the finish rolling is controlled to be 830-880° C.;
• 5) performing rapid cooling, namely cooling to 350° C. or below at a cooling rate of 40-150° C./s, and controlling an upper and lower cooling water ratio to be 45:55-75:80;
• 6) performing coiling, wherein a coiling temperature is controlled at 300-400° C., and a coiling tension is controlled to be 10-20 t;
• and
• 7) performing conventional temper rolling to control a waviness to not exceed 4.5 mm/m.