Method for preparing 15-5PH stainless steel pipe

A stainless steel and pipe technology, applied in the field of pipe manufacturing, can solve problems such as easy occurrence of cracks, and achieve the effects of eliminating internal stress, low cost and improving elongation.

Pending Publication Date: 2022-05-27
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above analysis, the embodiment of the present invention aims to provide a method for preparing 15-5PH stainless steel pipes to solve the problem that crack defects are prone to occur in the existing 15-5PH stainless steel pipe preparation process

Method used

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  • Method for preparing 15-5PH stainless steel pipe
  • Method for preparing 15-5PH stainless steel pipe
  • Method for preparing 15-5PH stainless steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] (1) Reaming: Heat the 15-5PH stainless steel blank with a through hole in the middle, put the heated blank in a vertical reaming cylinder, and use the reaming head to expand the small through hole in the middle of the blank from top to bottom, and then remove the blank from the reaming cylinder.

[0071] (2) Hot extrusion: The reamed 15-5PH stainless steel blank is thermoextruded plastic deformation treatment, and the high temperature 15-5PH stainless steel blank heated to 1200 ° C in the high temperature furnace is put into the cylindrical extrusion cylinder container with an extrusion die at the front end, and then the extrusion rod is extruded from the other end with thousands of tons of high pressure from the die hole to become an extrusion pipe (pipe thickness 30mm).

[0072] (3) Solution treatment: The extruded pipe after hot extrusion is cooled to 1050 ° C, and then quickly cooled to room temperature.

[0073] (4) Low temperature heat treatment: the room temperature ex...

Embodiment 2

[0077] (1) Reaming: Heat the 15-5PH stainless steel blank with a through hole in the middle, put the heated blank in a vertical reaming cylinder, and use the reaming head to expand the small through hole in the middle of the blank from top to bottom, and then remove the blank from the reaming cylinder.

[0078] (2) Hot extrusion: The 15-5PH stainless steel blank after reaming is thermoextruded plastic deformation treatment, and the high temperature 15-5PH stainless steel blank heated to 1200 ° C in the high temperature furnace is put into the cylindrical extrusion cylinder container with an extrusion die at the front end, and then the extrusion rod is extruded from the other end with thousands of tons of high pressure from the die hole to become an extrusion pipe (pipe thickness of 25mm), and the extruded pipe is cooled to room temperature.

[0079] (3) Solution treatment: The room temperature extruded pipe is heated to 1040 °C in a high-temperature furnace, insulation is 2min, an...

Embodiment 3

[0084] (1) Reaming: Heat the 15-5PH stainless steel blank with a through hole in the middle, put the heated blank in a vertical reaming cylinder, and use the reaming head to expand the small through hole in the middle of the blank from top to bottom, and then remove the blank from the reaming cylinder.

[0085] (2) Hot extrusion: The 15-5PH stainless steel blank after reaming is thermoextruded plastic deformation treatment, and the high temperature 15-5PH stainless steel blank heated to 1200 °C in the high temperature furnace is put into the cylindrical extrusion cylinder container with an extrusion die at the front end, and then the extrusion rod is extruded from the other end with thousands of tons of high pressure from the die hole to become an extrusion pipe (pipe thickness 27mm).

[0086] (3) Solid solution treatment: The extruded pipe after hot extrusion is cooled to 1060 ° C, and then the water is quickly cooled to room temperature.

[0087] (4) Low temperature heat treatme...

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Abstract

The invention relates to a method for preparing a 15-5PH stainless steel pipe, belongs to the technical field of pipe manufacturing, and solves the problem that crack defects are easy to occur in the existing 15-5PH stainless steel pipe preparation process. The method comprises the following steps: (1) carrying out hot extrusion plastic deformation treatment on a 15-5PH stainless steel blank to form an extruded pipe; (2) carrying out solution treatment on the extruded pipe in the step (1); (3) carrying out low-temperature heat treatment on the extruded pipe subjected to solution treatment at 340-360 DEG C; and (4) carrying out straightening treatment on the extruded pipe subjected to low-temperature heat treatment. The 15-5PH stainless steel pipe prepared by the method disclosed by the invention is free from crack defects.

Description

Technical field [0001] The present invention relates to the field of pipe manufacturing technology, in particular to a method for preparing 15-5PH stainless steel pipes. Background [0002] 15-5PH alloy steel material is martensitic precipitation hardened stainless steel, at room temperature, 15-5PH stainless steel material has high strength, but high flexural ratio (>0.9), low elongation (10-15%), low plasticity, low internal stress resistance. In the prior art, the bar is usually prepared using a 15-5PH alloy steel material. Since 15-5PH alloy steel materials are easy to crack in the process of preparing pipes, therefore, 15-5PH alloy steel materials are rarely used in the prior art to prepare pipes. Contents of the Invention [0003] In view of the above analysis, embodiments of the present invention is intended to provide a method of preparing 15-5PH stainless steel pipes, to solve the problem of crack defects prone to occur in the preparation process of existing 15-5PH s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/02B21C29/04B21C25/02
CPCB21C23/02B21C25/02B21C29/04
Inventor 孙永庆胡进刘振宝隆文庆苏承龙王长军
Owner CENT IRON & STEEL RES INST
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