Preparation method and manufacturing equipment of seamless special-shaped tube formed by hot-rolling and rolling on-line

A special-shaped pipe, seamless technology, applied in other manufacturing equipment/tools, manufacturing tools, metal processing equipment and other directions, can solve the problems of easy to strain the inner and outer surface of the steel pipe, complex cold drawing process, low metal yield, etc. To achieve the effect of reducing the finished annealing process, reducing the straightening process, and shortening the process route

CN103817493BActive Publication Date: 2016-04-27江苏界达特异新材料股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-04-27

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Abstract

The invention relates to a manufacturing method and manufacturing equipment for online hot rolling and rolling forming of seamless special pipes. The preparation method for the seamless special pipes is simple, easy to implement, low in needed drawing force, energy saving and cost reducing, environmental pollution is reduced, the steel pipes cannot be damaged, and the produced steel pipes can reach the standards on appearance, overall dimensions and comprehensive mechanical performance indexes. The appearance, the overall dimensions and the comprehensive mechanical performance indexes are specifically reflected in that defects of drags, scratches and the like in the appearance are avoided; the overall dimensions, straightness, flatness, R angle and the like meet standard requirements; mechanical performance, impact property, the metallographic structure and the like meet standard requirements. Meanwhile, in the equipment, a forming mill is improved, a quick cooling device and a quick steel feeding device are added, and the production requirement for online hot rolling and rolling forming of the seamless special pipes can be met.
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Description

technical field

[0001] The invention relates to a method for preparing hot-rolled and rolled-on-line seamless special-shaped pipes and special-purpose manufacturing equipment, which uses the residual temperature of hot-rolled steel pipes to form on-line, and belongs to the technical field of metal products. Background technique

[0002] In recent years, although the steel market as a whole is not optimistic, the demand for seamless steel pipes is still strong, and the development momentum is strong. In particular, seamless special-shaped steel pipes are more and more favored by customers. Because compared with the circular seamless steel pipe, the special-shaped seamless steel pipe has the following advantages: when the cross-sectional area is the same, the section moment of inertia of the special-shaped pipe is larger than that of the round pipe; The tube has greater bending stiffness; the special-shaped tube has better assembly, and the welding joint is reliable; the speci...

Examples

Embodiment Construction

[0048] The present invention relates to a method for preparing hot-rolled and rolled-on-line seamless special-shaped pipes. The process steps of the method are as follows:

[0049] Production example: Material Q345B Specification: 140*80*7mm Length: over 6m

[0050] Step 1, cutting off

[0051] The material is Q345B, and the round tube billet with a diameter of Φ150 is cut into a suitable length, and the cutting length is 1800-1900mm / piece.

[0052] Step 2. Heating

[0053] Put the finished circular tube billet into the ring furnace and heat it to 1220-1250°C.

[0054] Step three, hot rolling

[0055] The round tube billet heated to the specified temperature is hot-rolled into a 140*7mm round tube through the processes of piercing, cross rolling and sizing. (outer diameter Φ=(140+80)*2 / 3.14≈140mm)

[0056] Step 4. Control cooling

[0057] The hot-rolled finished round tube (temperature is usually above 800°C) is passed through the rapid cooling device at the back of the ...