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Forming method of unequal-wall-thickness reducing special-shaped stainless steel pipe

A forming method and stainless steel technology, which is applied in the field of stainless steel seamless steel pipe processing and manufacturing, can solve the problems of steel pipe safety reduction, no seamless production process, and inability to meet the use environment, and achieve the effect of high safety

Active Publication Date: 2015-03-25
SHANDONG YAO CHENG NEW MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Special-shaped stainless steel pipes with unequal walls and variable diameters are widely used in industry, but there is no mature seamless production process in steel pipe production; two steel pipes with a diameter of 19mm and one steel pipe with a diameter of 16mm plus two The 19mm~16mm variable diameter pipe fittings are welded and formed, and there are 4 weld joints in one steel pipe, and the appearance of butt weld seams reduces the safety of the steel pipe, which cannot meet some high-demand use environments

Method used

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  • Forming method of unequal-wall-thickness reducing special-shaped stainless steel pipe

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Embodiment

[0039] In this embodiment, a finished stainless steel pipe with an outer diameter of Φ19 mm and a wall thickness of 2 mm is used, and rolled into a special-shaped stainless steel pipe with a length d of 4500 mm, both ends d1 and d2 of 260 mm, a constant wall thickness of 2 mm, and a wall thickness of 1.5 mm in the middle section.

[0040] 1) The process flow is as follows.

[0041] Blanking - surface cleaning - marking - inner wall lubrication - first cold rolling - inner wall lubrication - second cold rolling - inner wall lubrication - third cold rolling - degreasing - solution treatment - Straightening - Cutting to length - Inspection and packaging.

[0042] 2) Mainly use equipment

[0043] Multi-roll cold rolling mill, solution heat treatment furnace, pickling tank, steel pipe tension leveler, sawing machine.

[0044] 3) Process methods and conditions

[0045] ⑴, cutting

[0046] The raw material is a finished stainless steel tube with an outer diameter of Φ19mm a...

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Abstract

The invention relates to a method for machining a reducing unequal-wall-thickness special-shaped stainless steel pipe by utilizing a cold rolling method, which belongs to the field of the machining and manufacturing of a stainless steel seamless steel pipe. According to the technical scheme, the forming method comprises the following steps: (1) blanking; (2) cleaning the surface; (3) scribing; (4) lubricating the inner wall; (5) primarily cold rolling; (6) lubricating the inner wall; (7) secondarily cold rolling; (8) lubricating the inner wall; (9) thirdly cold rolling; (10) degreasing; (11) carrying out solid-solution treatment; (12) straightening; (13) fixing the size and sawing; and (14) inspecting and packaging. According to the production process, the process difficulties can be solved; moreover, the integrally rolled seamless steel pipe is high in safety, and the use under a severe environmental condition can be satisfied.

Description

technical field [0001] The invention belongs to the field of stainless steel seamless steel pipe processing and manufacturing. Background technique [0002] Special-shaped stainless steel pipes with unequal wall and diameter are widely used in the industry, but there is no mature seamless production process in the production of steel pipes; mainly two steel pipes with a diameter of 19mm and a steel pipe with a diameter of 16mm plus two 19mm~16mm diameter reducing pipe fittings are welded and formed, a steel pipe has 4 weld joints, and the appearance of butt welds reduces the safety of the steel pipe and cannot meet some high-demand use environments. [0003] The integrally rolled seamless steel pipe has high safety and can be used in harsh environmental conditions. SUMMARY OF THE INVENTION [0004] For example, for two steel pipes with a diameter of 19mm and a steel pipe with a diameter of 16mm plus two reducing pipe fittings with a diameter of 19mm-16mm, there are 4 weld...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06
CPCB21C37/156
Inventor 张丙静杨琦锋施恩贵宋建
Owner SHANDONG YAO CHENG NEW MATERIALS TECH CO LTD
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