2results about How to "Guaranteed nitrogen content" patented technology

The application discloses a high-nitrogen plastic mold steel, which comprises the following components: C with a mass percentage of 0.28-0.33%, Si with a mass percentage of 0.25-0.38%, Mn with a mass percentage of 0.4-0.8%, Cr with a mass percentage of 14.5-15.5%, Mo with a mass percentage of 0.9-1%, N with a mass percentage of 0.095-0.115%, P with a mass percentage of less than or equal to 0.02%, S with a mass percentage of less than or equal to 0.003%, and O with a mass percentage of less than or equal to 0.0025%. The method for protecting atmosphere electroslag remelting the high-nitrogen plastic mold steel can ensure the nitrogen content of the plastic mold steel and improve the comprehensive characteristics of the plastic mold steel, for example, the setting parameters of the slag system and the filling ratio can ensure that the crystallized steel ingot is dense, the material is uniform, and non-metallic inclusions can be removed well; the N charging flow rate in the remelting process can keep the balance between the furnace atmosphere and the N content in the molten steel, and can ensure that the N content deviation of the whole steel ingot is small and consistent with the parent material before remelting.

The invention relates to the technical field of sewage treatment, and discloses domestic sewage resource utilization equipment which comprises a black water fermentation device, a grey water storage device, a monitoring assembly, a mixing device, a pump set and a controller. A black water inlet and a supernatant outlet are formed in the black water fermentation device. And the grey water storage device is provided with a grey water inlet and a grey water outlet. The monitoring assembly comprises a first nitrogen content detection device for monitoring the nitrogen content in the supernate and a second nitrogen content detection device for monitoring the nitrogen content in the grey water. And the mixing device is provided with a supernate mixing inlet and a grey water mixing inlet. The pump set comprises a first water pump and a second water pump, the first water pump is arranged on a communicating pipeline between the supernate outlet and the supernate mixing inlet, and the second water pump is arranged on a communicating pipeline between the grey water outlet and the grey water mixing inlet. The first nitrogen content detection device, the second nitrogen content detection device, the first water pump and the second water pump are all in communication connection with the controller.