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Method for forming large-diameter stainless steel square tube

A forming method and stainless steel technology, applied in the field of stainless steel seamless steel pipe processing and manufacturing, can solve the problems of large loss of pipe head, rolling section deformation, instability, etc., and achieve high dimensional accuracy of the product, small degree of end surface instability, stable short time effect

Inactive Publication Date: 2012-10-10
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No matter what kind of process, there are different degrees of instability in the rolling die pressing of large-diameter thick square tubes, and this situation is particularly serious at the biting end, where the deformation of the rolling section is the most serious, and it takes a long time to enter the steady state , which means that the loss of the pipe head is large
[0004] 1. It takes a long time to enter the steady state; 2. The radius of the arc corner fluctuates widely; 3. The wall thickness of the arc corner varies in a large range.

Method used

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  • Method for forming large-diameter stainless steel square tube
  • Method for forming large-diameter stainless steel square tube
  • Method for forming large-diameter stainless steel square tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0044] (1) Cutting, that is, the raw material is a stainless steel circular steel pipe with an outer diameter of Φ255~Φ281mm and a wall thickness of 13.5±0.3mm.

[0045] ⑵, the first surface lubrication, that is, apply lubricant (calcium stearate + lime) on the outer surface of the steel pipe, and the lubricant must be applied evenly. Then, dry the lubricant on the surface of the steel pipe at a low temperature of less than 100°C.

[0046] (3) At one end of the steel pipe, use a grinding wheel cutting machine to cut 4 equal cuts in the axial direction to form 4 equal slices with a length of 150±10mm, and then hit the equal slices with a hammer to make the 4 equal slices All are close to the axis of the steel pipe, so that the distance between the two opposite equal slices is less than 200mm;

[0047] ⑷. Weld the drawing head on one of the equal slices. The diameter of the drawing head is 150mm-180mm.

[0048] ⑸. The steel pipe welded with the drawing head is drawn through th...

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Abstract

The invention discloses a method for forming a large-diameter stainless steel square tube, and belongs to the field of processing and manufacturing of stainless steel seamless tubes. The method includes technological processes of raw material selecting, primary surface lubricating, tube end stripping, drawing head welding, primary drawing, primary pickling and degreasing, primary solid-liquid treatment, primary pickling, secondary surface lubricating, secondary drawing and head cutting, secondary pickling and degreasing, secondary solid-liquid treatment, straightening, secondary pickling, head flattening, dimension checking, ultrasonic flaw detection and packaging. Deformation in a drawing process tends to be alleviated, stabilizing time is short, and instability degree of an end surface is low. In addition, a formed product is high the dimensional precision and fine in flatness, and influence of the outer diameter of a circular tube billet is low before the product is formed.

Description

technical field [0001] The invention belongs to the field of processing and manufacturing stainless steel seamless steel pipes. The large diameter mentioned in the present invention refers to a pipe fitting whose outer diameter is greater than 159mm. Background technique [0002] Square rectangular tube is the most widely used and most common special-shaped steel tube. Compared with other non-round steel tubes with the same cross-sectional area, it has the advantages of light weight, high strength, large bending section modulus, metal saving, and easy installation. It is mainly used Used in industries such as construction, medical equipment, high-end furniture, automobiles, aircraft, subways and shipbuilding. [0003] At present, special-shaped welded steel pipes with simple end faces are mostly produced on high-frequency welded pipe units. The "round-different forming method" means that the strip steel is first rolled into a round pipe on the forming machine, and then weld...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06
Inventor 张丙静陈洪琪康喜唐
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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