30results about How to "Simple cooling process" patented technology

The invention relates to steel for an ultra-high-strength sucker rod and a production method thereof. The steel for an ultra-high-strength sucker rod is prepared from the following components: 0.07-0.13wt% of C, 4.0-7.0wt% of Cr, less than 0.50wt% of Mn, less than 0.50wt% of Si, 0.30-0.60wt% of Mo, 0.05-0.15wt% of V, 0.01-0.03wt% of Ti, less than 0.008wt% of P, less than 0.002wt% of S, 0.01-0.05wt% of Al, and the balance of Fe and unavoidable impurities; the steel also can contain less than 0.50wt% of Ni. For the steel for an ultra-high-strength sucker rod, a high-temperature tempered martensite structure can be obtained by adopting a super-clean steel smelting technology with low cost and a heat treatment process including normalizing and high-temperature tempering, nano Cr, V, Mo composite nanoparticles are used as precipitation strengthening phases, and the yield strength can reach 800MPa grade, and the steel disclosed by the invention has the corrosion resistance prior to that of KD-grade steel 20Cr2MoNiA for a sucker rod and can be used for producing H-grade ultra-high-strength corrosion-resistant steel sucker rods.

The invention discloses a low-temperature cooling system and belongs to the technical field of design and manufacture of medical apparatus and instruments. The invention provides a low-temperature cooling system through which the cost can be obviously reduced in the process of cooling a superconducting magnet in a temperature area from 300K to 4.2K. The low-temperature cooling system comprises a low-temperature refrigerated container, a low-temperature refrigerating unit, a liquid nitrogen container with a mounting channel, a cold shield with a perforation, and a 300K container with a connecting flange, wherein the liquid nitrogen container is positioned in the cold shield; the cold shield is positioned in the 300K container; the low-temperature refrigerating unit comprises a primary refrigerating unit, a secondary refrigerating unit and a primary hot link; the low-temperature refrigerating unit is arranged in the mounting channel through a top wall of the low-temperature refrigerated container; the secondary refrigerating unit is positioned in the mounting channel; the low-temperature cooling system also comprises a heat exchange cold guiding device positioned at the middle lower part of the mounting channel; the heat exchange cold guiding device is connected to the tail end of the secondary refrigerating unit of the low-temperature refrigerating unit.

The application discloses an acid-resistant martensitic wear-resistant steel plate, which includes 0.14wt%≤C≤0.22wt%; 0.30wt%≤Si≤0.60wt%; 0.30wt%≤Mn≤1.00wt% in mass percentage; 0.010wt%≤Ti≤0.020wt%; 0.02wt%≤Nb≤0.04wt%; 0.50wt%≤Ni≤1.0wt%; 0.20wt%≤Cu≤0.50wt%; 0.9wt%≤Cr≤1.3wt%; 0.08wt%≤Sb≤0.12wt%; 0.0010wt%≤B≤0.0020wt%; 0<S≤0.003wt%; 0<P≤0.012wt%; Issues of hardness, plasticity, toughness, wear resistance and corrosion resistance.

This application belongs to the technical field of iron and steel metallurgy, and in particular relates to a martensitic wear-resistant steel plate resistant to atmospheric corrosion, including 0.14wt%≤C≤0.22wt%; 0.30wt%≤Si≤0.60wt%; 0.30wt% %≤Mn≤1.00wt%; 0.010wt%≤Ti≤0.020wt%; 0.02wt%≤Nb≤0.04wt%; 0.50wt%≤Ni≤1.0wt%; 0.20wt%≤Cu≤0.50wt%; 3.4wt% %≤Cr≤4.0wt%; 0.0010wt%≤B≤0.0020wt%; 0<S≤0.003wt%; 0<P≤0.012wt%; The corroded martensitic wear-resistant steel plate can take into account the hardness, plasticity, toughness, wear resistance and corrosion resistance of the steel plate.