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Method for making 17-7PH thick wall seamless pipe

A seamless, back-wall technology, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve problems such as incomplete guarantee of magnetic permeability, partially unqualified magnetic permeability, poor pickling surface quality, etc., to achieve The effect of reducing cold processing passes, improving surface quality, and increasing product yield

Inactive Publication Date: 2010-06-16
宝钢特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 2. Heat treatment, the magnetic permeability of the finished product is partially unqualified after heat treatment, and the heat treatment process of the finished product cannot fully guarantee the magnetic permeability to meet the technical requirements
Stainless steel pickling process HF+HNO 3 Pickling, the surface is gray-black, the pickling time is a little longer, the surface is corroded (the surface is dull and sandy), and the pickling surface quality is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] The present invention will be further described below in conjunction with embodiment:

[0049] 1. Cold deformation

[0050] Cold deformation is carried out according to Table 1. The rolling mills used are LG110H and LG80. The surface quality after cold rolling is inspected and local grinding is carried out. The drawing machine used is LB65, and the pipe is baked at low temperature immediately after drawing the outer diameter, and the drawing is relatively smooth, see Table 2.

[0051] Table 1 cold deformation process

[0052] Deformation

[0053] Table 2 43×11 cold deformation process

[0054] deformation device

[0055] deformation device

[0056] 2. Finished product wall thickness control

[0057] According to Table 1, when rolling the outer diameter of 57mm, the wall thickness is controlled to be 11.77mm. After two outer diameter drawing and subsequent processes, the wall thickness reduction is relatively large, and the final product ...

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PUM

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Abstract

The invention relates to a method for making a 17-7PH thick wall seamless pipe, which comprises the steps of: 1, cold deformation, wherein cold-rolling and cold-drawing integrated production process is adopted, the external diameter dereduction factor is controlled to be 25-32 percent, the wall thickness reduction rate is controlled to be 16-20 percent, the distortion is controlled to be 38-50 percent; 2, baking at low temperature after drawing the external diameter, wherein the baking temperature is 200-300 DEG C and the baking time is 20-30min; 3, heat treatment, wherein a continuous roller hearth furnace is adopted in a middle heat treatment process, the solid solution temperature is 1050-1080 DEG C, and the heat preservation time is controlled to be 35-60min; and the heat treatment for a finished product adopts a continuous type roller hearth furnace, the heat treatment process is a solid solution and aging integrated treatment process, the solid solution temperature is 1040-1060 DEG C, and the heat preservation time is 20-30min; 4, scouring, wherein the scouring temperature is controlled to be 40-60 DEG C and the scouring time is controlled to be 15-20min; and 5, straightening, deoiling, degreasing, cutting and hammering. The invention reduces cold machining pass, prevents the pipe from longitudinally cracking, meets the requirement on magnetic conductivity of the finished product, provides surface quality, and controls the size of the finished product.

Description

technical field [0001] The invention relates to a pipe-making method of a precipitation-hardening stainless steel seamless pipe in the metallurgical industry, in particular to a method for controlling cold rolling, dimensional tolerance and magnetic properties of thick-walled pipes. Background technique [0002] Stainless steel is a relatively common alloy steel, including ferritic stainless steel, austenitic stainless steel, martensitic stainless steel, duplex stainless steel and precipitation hardening stainless steel. [0003] 0Cr17Ni7Al is a typical grade of precipitation hardening stainless steel, which has good resistance to pitting corrosion and good resistance to intergranular corrosion, and has better corrosion resistance than austenitic stainless steel 1Cr18Ni9Ti. In addition to good corrosion resistance, it has high strength, hardness and good plasticity, and has good comprehensive mechanical properties. [0004] The main grades of this type of stainless steel ar...

Claims

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Application Information

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IPC IPC(8): B21C37/06B21B37/16B21B37/78B21C1/22C21D9/08C21D11/00C23G1/02
Inventor 王绪年陈永芳
Owner 宝钢特钢有限公司
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