Characteristic

The production process of q235 seamless steel pipe can be divided into two types: cold drawing and hot rolling. The production process of cold rolling is generally more complicated than that of hot rolling. Into the annealing process, the annealing should be pickled with acid liquid. The main implementation standards are: GB/T8162-2008, GB/T8163-2008, GB5310-2008, GB3087-2008, GB6479-2000, etc.

The main purpose

Suitable for general structures, engineering supports, mechanical processing, conveying fluids, chemical equipment and pipelines

FAQ

Question: What is the difference between cold drawn and hot rolled Q235 seamless steel tubes?

Answer: Cold drawing is to draw metal with a cold drawing machine without heating. The advantage is that it does not need to be carried out at high temperature. The disadvantage is that the residual stress is large and the drawing cannot be too long.

Hot rolling uses slabs (mainly continuous casting slabs) as raw materials. After heating, the rough rolling mill and the finishing mill are used to make strip steel.

1. Whether the section has local buckling:

The cold-rolled steel allows partial buckling of the section, so that the bearing capacity of the bar after buckling can be fully utilized.

Hot-rolled steel sections are not allowed to buckle locally.

2. Different distribution of residual stress in cross-sectional area:

The residual stress distribution on the cross-section of the cold drawn pipe is curved.

The residual stress distribution on the cross-section of the hot-rolled tube is thin-film type.

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