Carbon steel seamless steel tube concrete classification

Carbon steel seamless steel pipe concrete classification and application
1, general carbon seamless pipe
General carbon content 0.25% or less steel is low carbon steel, mild steel annealing organization for ferrite and a small amount of pearlite, its low strength and hardness, plasticity and toughness is good, easy to drawing, stamping, extrusion, forging and welding, including 20 cr steel used more widely.The steel has the certain strength, after the steel quenching tempering at low temperature has good comprehensive mechanical properties, good low temperature impact toughness, temper brittleness is not obvious.
USES: in the machinery manufacturing is suitable for making welding structure, and by forging, hot stamping and machining parts are not affected by high stress, corrosion in the steam turbine and boiler manufacturing for more than medium work of pipes, flanges, header, and various kinds of fasteners;Applies to the manufacture of automobiles, tractors and general machinery manufacturing small and medium-sized carburizing and carbonitriding parts, such as car hand brake shoe, passive gear lever fork shaft, transmission speed, transmission and tractor on the camshaft, hanging balancer shaft, balancer, inner and outer bushing, etc.;In medium and heavy machinery industry, such as forging or suppression of rod, shackle, leverage, sleeve, fixture, etc.
 
2, low carbon steel seamless steel tube
The carbon content of mild steel carburizing: in more than 0.15% of low carbon steel after carburizing and quenching and low temperature tempering treatment, surface requirement for high hardness, good wear resistance shaft, shaft sleeve, sprocket, and some parts, such as plastic mold.Low carbon steel after carburizing and quenching and low temperature tempering treatment for surface for high carbon martensite, the core of low carbon martensite organization, so as to ensure that the surface has high hardness, high wear resistance and core has good strength and toughness.Hand for the production brake shoe, fork lever shaft, transmission speed, transmission driven gear and the tractor on the camshaft, hanging balancer shaft, balancer, inner and outer sleeve, sleeve, fixture, etc.


3, medium carbon steel seamless steel tube
Medium carbon steel, carbon is 0.25% ~ 0.25% of the carbon steel, 30, 35, 40, 45, 50, 55 brand belongs to the medium carbon steel, because of the content of pearlite in the steel, before its strength and hardness is improved, the hardness after quenching can increase significantly.Among them, with the most typical of 45 steel.45 steel is the carbon quenched and tempered high strength steel, has a certain plasticity and toughness, good cutting performance, the quenched and tempered treatment can obtain good comprehensive mechanical properties, low hardenability.Used in the manufacture of high strength requirement, the toughness of medium parts.Usually in conditioning or using normalized condition.In order to make the steel has the necessary toughness and eliminate the residual stress, should be after the steel quenching tempering sorbite.