Abstract: A quenched-tempered high-strength steel having a yield strength of 900-1000 MPa grade and a method of producing the same, with the components and amounts thereof by weight percentage being: C: 0.16-0.20%, Si: 0.10-0.30%, Mn: 0.80-1.60%, Cr: 0.20-0.70%, Mo: 0.10-0.45%, Ni: 0.10-0.50%, Nb: 0.010-0.030%, Ti: 0.010-0.030%, V: 0.010-0.050%, B: 0.0005-0.0030%, Al: 0.02-0.06%, Ca: 0.001-0.004%, N: 0.002-0.005%, P?0.020%, S?0.010%, O?0.008%, and the balance of Fe and unavoidable impurities, and Ceq 0.51-0.60%, Ceq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15; 3.7?Ti/N?7.0; 1.0?Ca/S?3.0; 0.8%?Mo+0.8Ni+0.4Cr+6V?1.3%. By using a process of controlling rolling, controlling cooling, and off-line quenching+tempering, a steel sheet produced according to the disclosure has a yield strength of 900-1080 MPa, a tensile strength of 950-1200 MPa, an elongation >10%, and an impact energy at ?40° C. >40 J.

Abstract: The present invention relates to an exhaust gas expansion tank and an ozone generator system applying the same. The exhaust gas expansion tank includes a tank body and an automatic exhaust valve, and is provided at the top thereof with a gas outlet conduit, the lower end of the gas outlet conduit extending into the tank body and being at a distance from the bottom of the tank body, the automatic exhaust valve fixedly mounted on the upper end of the gas outlet conduit, and the tank body having a first water port and a second water port. The ozone generator system applying the exhaust gas expansion tank is simplified in system structure, can evacuate gas automatically and omit the manual exhausting of gas, thereby the operation procedure is simplified, the thermal expansion of the system is effectively controlled and the stability of the system operation is increased.

Abstract: The present invention relates to an exhaust gas expansion tank and an ozone generator system applying the same. The exhaust gas expansion tank includes a tank body and an automatic exhaust valve, and is provided at the top thereof with a gas outlet conduit, the lower end of the gas outlet conduit extending into the tank body and being at a distance from the bottom of the tank body, the automatic exhaust valve fixedly mounted on the upper end of the gas outlet conduit, and the tank body having a first water port and a second water port. The ozone generator system applying the exhaust gas expansion tank is simplified in system structure, can evacuate gas automatically and omit the manual exhausting of gas, thereby the operation procedure is simplified, the thermal expansion of the system is effectively controlled and the stability of the system operation is increased.