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difference of hot rolled steel and cold drawn steel pipe

by:Sibai      2020-03-01
Rolling and cold rolling or steel plate is a step, they have a great influence on the structure and performance of the steel, rolling steel
Rolling is mainly used for production only. . . Hot-
Rolling and cold rolling or steel plate is a step, they have a great influence on the structure and performance of the steel, rolling steel
Mainly rolling, only for the production of cold-rolled steel plate and steel plate trumpet. First, the hot-
Advantages of rolling: it can destroy the structure of ingot, refine the grain size of steel, eliminate the defect structure, make the steel structure dense, and improve the mechanical properties.
This improvement is mainly reflected in the rolling direction, so that the steel is no longer a certain degree of the same-sex body;
Bubbles, cracks and looseness are formed during pouring, and can also be welded together at high temperature and high pressure.
Disadvantages: 1. After the hot-
Non-inner steel rolling
Inclusion of metal (
Mainly sulfur and oxide, and silicon)
Pressed on paper, layered (mezzanine)phenomenon.
Layered in the thickness direction, significantly deterioration of the tensile properties of the steel, and there may be a joint tear weld shrinkage.
The local strain caused by welding shrinkage reaches the yield point strain, usually several times larger than the load caused by strain. 2.
Residual stress caused by uneven cooling.
Residual stress without external force
Thermal equilibrium stress
Rolling Steel has a variety of sections, the greater the residual stress
The larger the section size, the greater the residual stress.
Although the residual stress is from
Balance, but it still has a certain impact on the performance of steel members under load.
Such as deformation, stability, fatigue and other aspects.
It is likely to have adverse effects.
Second, cold rolling refers to the cold plate or cold belt processed into various types of steel at room temperature through cold drawing and cold drawing.
Advantages: fast molding speed, high output, no damage to the coating, can be made into a variety of cross
In the form of segmentation, it is necessary to adapt to the conditions of use; 2. cold-
The steel will produce a lot of plastic deformation, so as to improve the yield point of the steel.
Disadvantages: 1.
Although not compressed by hot plastic during molding, there is still residual stress in the cross shape
The overall and local flexion properties of the section will inevitably affect the steel; 2. 2. cold-
The sewing style is generally an open part, allowing free crossover
Low torsional stiffness.
When bending, it is easy to bend in compression
Torsional flexion, poor torsional performance; 3. cold-
The wall thickness of the molded steel is small, convergence at the corner of the plate, there is no thicker, and the ability to withstand local concentrated loads is weak.
Third, the main difference between hot and cold steel is allowed to cross
The sectional partial flexion can make full use of the bearing capacity after the curved rod; and hot-
Local flexion of steel section is allowed.
2. heat due to different reasons-
Steel and cold rolling
The residual stress of the steel, so the distribution of the cross section is also very different. Cold-
The residual stress distribution of molded steel on the cross section is curved, and the welding residual stress distribution of hot steel rolling or steel on the cross section of the film type. 3, hot-
Free torsional stiffness ratio cold rolled steel
The torsional performance of rolled steel is better than that of hot steel rolling.
Cold pull steel.
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