2results about How to "Low S content" patented technology

The invention provides a P92-series low-S and low-P steel ingot and forge piece and a preparation method and application thereof, and belongs to the technical field of metal materials. The preparation method of the P92-series low-S and low-P steel ingot comprises the following steps that raw materials for preparing the P92-series low-S and low-P steel ingot are sequentially smelted, refined, cast and annealed, and the P92-series low-S and low-P steel ingot is obtained; wherein in the P92-series low-S and low-P steel ingot, the S content is less than or equal to 0.005%, and the P content is less than or equal to 0.015% by mass. According to the method, the P92-series low-S and low-P steel ingot is obtained by controlling specific smelting and refining conditions, and the forged piece prepared from the P92-series low-S and low-P steel ingot has excellent high-temperature mechanical property.

This invention discloses a method for producing 450MPa grade low-alloy high-toughness hydrogen-resistant container steel, including smelting, rolling, quenching heating, quenching cooling, and heat treatment processes; wherein, during the quenching cooling process of the steel plate, the total water volume in the high-pressure section is controlled at 2400-3500 m³ / h. 3 The rolling speed of the steel plate in the high-pressure section is 5-10 m / min. During the smelting process, after strong deoxidation, a large argon gas stirring operation is performed, with an argon gas pressure of 0.3-0.6 MPa. During the rolling process, high-pressure water is applied to the billet before it enters the rolling mill, with a water pressure of 0.2-0.3 MPa and a steel feeding speed of 20-30 m / min. The quenching process adopts segmented heating. After quenching, tempering treatment is performed. The steel plate produced by the above method has an impact absorption energy of ≥100 J at -50℃ in the core, a yield strength of 290-370 MPa, a tensile strength of 460-530 MPa, and good resistance to hydrogen-induced cracking.