Classification And Application Of Carbon Steel Seamless Pipe

Seamless carbon steel pipes are made of steel ingots or solid tube blanks that are perforated into capillary tubes, and then made by hot rolling, cold rolling or cold drawing, which with characteristics of excellent durability and corrosion resistance. Union Steel will briefly introduce the specific classification and function of carbon steel seamless pipes in the following.

Classification of Carbon Content Seamless Pipe:

1. General Carbon Content Seamless Pipe

Generally, steel with a carbon content of≤0.25% is called low carbon steel. The annealed structure of low carbon steel is ferrite and a small amount of pearlite. It has low strength and hardness, good plasticity and toughness, and is easy to stretch, stamp, extrude, forge and weld, among which 20Cr steel is more widely used. Steel has a certain strength. After low-temperature quenching and tempering, the steel has good comprehensive mechanical properties, good low-temperature impact toughness, and no obvious temper brittleness.

2. Low Carbon Content Seamless Pipe

Low-carbon steel: Low-carbon steel with a carbon content greater than 0.15% is used for shafts, shaft sleeves, sprockets and some plastic molds with high surface hardness and good wear resistance after carburizing and quenching and low-temperature treatment. Temper. Element. After carburizing and quenching and low-temperature tempering, low-carbon steel has a structure of high-carbon martensite on the surface and low-carbon martensite in the center, which ensures high hardness and high wear resistance on the surface and high hardness in the center. Good strength and toughness.

3. Medium Carbon Content Seamless Pipe

Medium carbon steel: carbon steel with a carbon content of 0.25% to 0.60%. 30, 35, 40, 45, 50, 55 and other grades belong to medium carbon steel. Due to the increased pearlite content in the steel, its strength and hardness are higher than before. The hardness can be significantly improved after quenching. Among them, 45 steel is the most typical. 45 steel is a high-strength medium-carbon quenched and tempered steel with certain plasticity and toughness, and good cutting performance. Good comprehensive mechanical properties can be obtained through quenching and tempering treatment, but the hardenability is poor.

Application of Carbon Content Seamless Pipe:

- Machinery manufacturing

It is suitable for making welded structural parts and parts that are not subject to high stress after forging, hot stamping and machining.

- Steam turbine and boiler manufacturing industry

It is mostly used for pipes and flanges working in non-corrosive media.

- Headers and various fasteners

- Manufacture of small and medium carburized and carbonitrided parts in the manufacture of automobiles, tractors and general machinery,

- Heavy and medium machinery manufacturing industry