Advantages and disadvantages of hot-rolled steel pipe

 

Advantages and disadvantages of hot-rolled steel pipe

 Regardless of the personnel engaged in the sale of steel steel or procurement officers should understand the advantages and disadvantages of some of the hot-rolled steel pipe. When customers ask to hot-rolled steel pipe strengths and weaknesses What, you can not tell it was a little less good. Summarizes the advantages and disadvantages of hot-rolled steel pipe, hoping to be helpful for those who read.

 

The hot-rolled steel pipe with respect to cold-rolled, hot-rolled steel pipe rolling is conducted above the recrystallization temperature; cold rolling is below the recrystallization temperature of the rolling. The advantages and disadvantages of hot-rolled steel pipe, what is it?

 

Advantages:

A hot-rolled steel pipe is usually a large ingot, pressurized under Cover rolling, not only improve the production efficiency, but also create the conditions for the rolling speed, to achieve a continuous rolling process and automation.

2 hot-rolled steel pipe can significantly reduce energy consumption and reduce costs. Hot-rolled steel pipe, metal plastic deformation resistance, greatly reducing the energy consumption of the metal deformation.

3 hot-rolled steel pipe can improve the processing performance of metals and alloys. The forthcoming casting state of coarse grain crushed, a significant crack healing, and to reduce or eliminate casting defects will cast microstructure into deformed tissue, improve the processing properties of the alloy.

 

Disadvantages:

1 after the hot-rolled steel pipe, steel inside the non-metallic inclusions (mainly sulfides and oxides, as well as the silicate) was pressed into a sheet, stratified (laminated) phenomenon appears. The layering of the steel in the thickness direction by the pull performance deteriorated significantly, and may appear in the weld shrinkage interlayer tear. Weld shrinkage induced local strain often reach several times the yield point strain, the strain is much greater than the load caused;

Residual stress caused by uneven cooling. The residual stress is the stress of internal self-phase equilibrium in the absence of external force, and a hot-rolled steel pipe steel of various cross-sectional has a residual stress such Usually steel sectional dimension is the greater, the greater the residual stresses. Residual stress is self-phase equilibrium, but the steel members in the performance external force or have a certain influence. Such as deformation, stability, anti-fatigue may adversely.

3 hot-rolled steel pipe can not be very precise control products required mechanical properties, the organization and performance of hot-rolled steel pipe products can not be uniform. Strength indicators below the cold hardening products, and higher than the fully annealed products; plasticity index higher than that of cold hardening products, but lower than the fully annealed products.