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Large-caliber nickel base alloy seamless pipe and preparation process thereof

A preparation process and technology for nickel-based alloys, applied in the field of austenitic stainless steel, can solve the problems of low production yield and high cost, and achieve the effects of increasing yield, controlling grain size, and simple and reliable process.

Active Publication Date: 2020-02-04
ZHEJIANG GUOBANG STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will lead to lower production yield and high cost

Method used

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  • Large-caliber nickel base alloy seamless pipe and preparation process thereof
  • Large-caliber nickel base alloy seamless pipe and preparation process thereof
  • Large-caliber nickel base alloy seamless pipe and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 Preparation of N06600 material, φ406.4×9.53mm nickel-based alloy finished tube

[0040] Image 6 The outer diameter of the round tube billet shown is φ300mm. After hot piercing, the blank tube is φ365×20mm. First, heat treatment is performed to make the internal structure of the material uniform, the carbides are fully dissolved, and the grain size of the inner and outer walls tends to be uniform; The first drawing and expansion deformation (1 cold drawing with wall reduction and diameter reduction, 3 consecutive diameter expansion cold drawing), the second drawing expansion deformation (1 wall reduction and diameter reduction cold drawing, 3 consecutive diameter expansion cold drawing), and then Continuously carry out 3 times of wall-reducing cold drawing and heat treatment to obtain the finished large-diameter nickel-based alloy seamless pipe;

[0041] After each cold drawing, the tube blank is heat treated, and after each heat treatment, it is pickled and ...

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PUM

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Abstract

The invention provides a preparation process of a large-caliber nickel base alloy seamless pipe. The preparation method comprises the following steps: pipe blanks are heated for three times of wall-reduction and diameter-reduction cold drawing; and the heat treatment method comprises the following steps: the pipe blanks are insulated by 1050-1080 DEG C for water quenching; the insulation time is 1.8-2.1 min / mm*the wall thickness of the pipe blanks; and nickel base alloys comprise NS1101, NS1102, NS3102, NS3102 and N06600. The preparation process has the beneficial effects of simple equipment,relatively lower deformation cost, good product surface quality controllability, smooth product surfaces, prominent strength and hardness improvement and better plasticity.

Description

technical field [0001] The invention relates to the field of austenitic stainless steel, in particular to a large-diameter nickel-based alloy seamless pipe and a preparation process thereof. Background technique [0002] At present, the general austenitic large-diameter seamless pipe process adopts cold expansion several times to reach the set pipe diameter, and then continuously reduces the diameter and wall for 3 times to the finished pipe. For example, when preparing general austenitic stainless steel large-diameter seamless pipes with an outer diameter of φ325-610mm or more, due to the outer diameter of the raw material rough tube is φ200-300mm, it is generally necessary to undergo multiple passes of diameter expansion and then multiple reductions in diameter and wall reduction. The finished tube is obtained by cold drawing process. Taking the material of 22Cr19Ni10 as an example, when the finished product specification is φ406.4×9.53mm, due to the need for multi-pass c...

Claims

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Application Information

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IPC IPC(8): B21C37/06C22F1/10C21D9/08C23G1/10
CPCB21C37/06C21D9/085C22F1/002C22F1/10C23G1/10
Inventor 陈深李新略伍素云林日朴
Owner ZHEJIANG GUOBANG STEEL