Hot rolling forming method of stainless steel seamless steel tube

A seamless steel pipe and hot-rolled forming technology, which is used in the processing of stainless steel seamless steel pipes and the production of seamless steel pipes, can solve the problems of low metal yield, poor high temperature plasticity, and high manufacturing costs, and achieve good surface quality and short production processes. , The effect of less product grinding

Inactive Publication Date: 2013-08-21
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its high manufacturing cost and low metal yield, the extrusion process is only rarely used by enterprises
However, the hot rolling process has not been applied to the production of stainless steel. The main bottleneck is their poor high-temperature plasticity and easy cracking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] (1) The material of the seamless steel pipe is 304, and the product specification is φ159mm×12m.

[0007] (2) The billet used is rolled billet with a specification of φ180×1200mm.

[0008] (3) The blank is peeled, inspected and ground.

[0009] In order to ensure the rolling precision of the steel pipe, the tube blank is peeled or externally ground to ensure that there are no cracks, scars and other defects on the surface of the round billet.

[0010] (4) Blank heating

[0011] Φ180 tube blank heating system

[0012]

Preheating section

Heating section

soaking section

heating temperature

0～850℃

850～1170℃

1170～1150℃

heating time

130~150 points

50~60 minutes

25~40 minutes

[0013] (5) perforation

[0014] 219 cone-type two-roll piercing machine is used for piercing. The material of the roll is 60Mn, the material of the guide plate is high-chromium cast iron, and the material of the plug is molybdenum-...

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PUM

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Abstract

The invention relates to a hot rolling forming method of a stainless steel seamless steel tube. The hot rolling forming method comprises the following steps of (1) stainless steel tube blank equaling, wherein equaling action enables the thickness of a wall to be uniform; (2) cooling, wherein surface quality inspection is carried out, surface defects, surface microcracks in particular, are polished cleanly, and at the moment, due to the fact that the deformation ratio of a reeling mill is very small, surface defects of a tubular billet almost cannot be widened; (3) secondary heating, wherein light pipes without surface defects are heated to 900-1150 DEG C, and corrosion resistance requirements can be met by means of on-line solid solutions; (4) fixed reducing, wherein a three-roller type fixed reducing mill is normally used for the fixed reducing, a deforming mode is simpler than a hole punching and reeling mode, large deformation can be carried out in a fixed reducing step, and production of various specifications is achieved. The hot rolling forming method is short in technological process, low in cost, simple and flexible in operation, and suitable for production in bulk.

Description

technical field [0001] The invention relates to the field of seamless steel pipe production, in particular to the field of stainless steel seamless steel pipe processing, and relates to a hot rolling forming method for stainless steel seamless steel pipes. Background technique [0002] Domestic production of austenitic stainless steel seamless steel pipes generally adopts hot piercing + cold drawing or cold rolling. After 2000, some newly built production lines began to use hot extrusion to produce austenitic stainless steel seamless steel pipes, and all foreign countries used hot extrusion to produce stainless steel seamless steel pipes. Due to its high manufacturing cost and low metal yield, the extrusion process is only rarely used by enterprises. However, the hot-rolling process has not been applied to the production of stainless steel. The main bottleneck is their poor high-temperature plasticity and easy cracking. Contents of the invention [0003] In order to over...

Claims

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Application Information

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IPC IPC(8): B21B19/00B21B19/04B21B19/10
Inventor 张凯庞于思
Owner XINXING DUCTILE IRON PIPES CO LTD
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