Spiral finned tube

Spiral welded finned tubes are one of the most common types of finned tubes. By spirally winding the fins on the base tube and welding at the bottom of the fins, The connection between the fin and the base tube is very tight, which can prevent the fin from loosening due to thermal stress, oxidation, corrosion, etc., so it can be used at very high temperatures.

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Study on Cooling Method of SUP9 Spring Flat Steel

Study on Cooling Method of SUP9 Spring Flat Steel Hot rolled spring flat steel bar is mainly used for the automotive industry, and it’s the raw material for automobile leaf spring manufacturing. The main varieties of spring steel include 60Si2Mn spring steel, SUP9 spring steel flat bar , 55SiMnVB spring steel. SUP9 spring steel flat bar is produced in accordance with the Japanese standard. At present, many leaf spring manufacturers mostly use SUP9 spring steel as the raw material for manufacturing automotive leaf springs. Compared with 60Si2Mn, SUP9 spring steel has good hardenability and low decarburization tendency, so the mechanical properties and fatigue properties of the leaf springs produced with SUP9 spring steel are better than that of 60Si2Mn steel. However, due to the good hardenability of SUP9 steel , the hardness is often too high during actual rolling production and cooling. The reheating, quenching and tempering treatment are carried out in...

Development of A32 and A36 High Strength Shipbuilding Steel Plates

Development of A32 and A36 High Strength Shipbuilding Steel Plates Since the 1990s, China’s shipbuilding steel plates industry has entered the international market on a large scale, and the shipbuilding steel plates industry has gradually become one of the pillar industries in China. With the development of shipbuilding steel plates in the direction of large-scale and light-weight, the general strength ship plates can no longer meet the needs of the hull, and the proportion of high-strength ship plates will continue to increase. Therefore, the development of high-strength shipbuilding plates has broad market prospects. Structural steel for hull can be divided into general strength steel and high strength steel. A32 and A36 are one type of structural steel for high strength hull. With the development of the shipbuilding industry, the requirements for materials are becoming more and more demanding. At present, in the factory approval, besides the certification of the ...

Rail clip installation

Rail clip installation rail clip installation Prerequisites for the rail clip installation 1. The rail presser is installed after the steel beam on the crane rails surface is adjusted; 2. The steel beam of the crane must be 3. The rail pressure device should be installed; 4. Before the installation of the rail clamp , the surface paint of the crane beam is finished and meets the requirements of the current regulations; 5. Before the installation of the rail presser, the track joints should be connected, and the track joints and side bending deviations should meet the requirements of “Steel Structure Engineering and Acceptance Specifications”-83). 6. The welding of the base plate control plate and the steel suspension beam should meet the design requirements. Installation sequence and essentials A. Welding the fixed base, the fixed base can be used, the three grooves on the surface and the position of the rail presser can be positioned, and the allowable deviation of the position ...

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