Anti corrosion spiral steel pipe for drainage pipeline Cangzhou spiral steel pipe spot welding spiral steel pipe price

Description :

　　Low temperature tempering of L290 spiral steel pipe (150-250 degrees)

　　The microstructure obtained from low-temperature tempering of L290 spiral steel pipe is tempered martensite. The purpose is to reduce the internal stress and brittleness of quenched steel while maintaining its high hardness and wear resistance, in order to prevent cracking or premature damage during use. It is mainly used for various high carbon cutting tools, measuring tools, GB/T9711.1 pipeline steel pipes, rolling bearings, and carburized parts. After tempering, the hardness is generally HRC58-64.

　　L290 spiral steel pipe medium temperature tempering (250-500 degrees)

　　The microstructure obtained by medium temperature tempering is tempered martensite. Its purpose is to achieve high yield strength, elastic limit, and high toughness. Therefore, it is mainly used for the treatment of various GB/T9711.1 pipeline steel pipes and hot work molds, and the hardness after tempering is generally HRC35-50.

　　L290 spiral steel pipe high temperature tempering (500-650 degrees)

　　The microstructure obtained from high-temperature tempering is tempered martensite. Traditionally, the heat treatment combining quenching and high-temperature tempering is called quenching and tempering treatment, which aims to obtain comprehensive mechanical properties with good strength, hardness, plasticity, and toughness. Therefore, it is widely used in automobiles,

　　GB/T9711.1 Pipeline steel pipes, important structural components of machine tools, such as connecting rods, bolts, gears, and shafts. The hardness after tempering is generally HB200-330.

　　Stacking principle:

　　1. The principle requirement for stacking spiral steel pipes is to stack them according to their varieties and specifications while ensuring stability and safety. Different types of materials should be stacked separately to prevent mixing and mutual erosion;

　　2. It is prohibited to store items that can corrode steel around the spiral steel pipe stack;

　　3. The bottom of the spiral steel pipe stack should be elevated, sturdy, and flat to prevent moisture or deformation of the material;

　　4. The same materials are stacked separately according to the order of storage;

　　5. Spiral steel pipe sections stacked outdoors must have wooden pads or stone strips underneath, with a slightly inclined stacking surface to facilitate drainage, and attention should be paid to placing the materials flat to prevent bending and deformation;

　　6. The stacking height of spiral steel pipes shall not exceed 1.2m for manual operation, 1.5m for mechanical operation, and 2.5m for stack width;

　　7. There should be a certain passage between stacks, and the inspection passage is generally 0.5m. The access passage depends on the size of the material and the transportation machinery, and is generally 1.5-2.0m;

　　8. When stacking angle steel and channel steel in the open air, they should be placed facing downwards, while I-beams should be placed upright. The I-groove surface of the steel should not face upwards to avoid water accumulation and rust;

　　9. Raise the bottom of the stack. If the warehouse has a sunny cement floor, raise it by 0.1m; If it is a muddy ground, it must be raised by 0.2-0.5m. If it is an open-air site, the cement ground should be raised by 0.3-0.5m, and the sand and mud surface should be raised by 0.5-0.7m.

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