Method for manufacturing Cr-Ni-Mo-Nb nickel base alloy seamless tube

A technology of nickel-based alloy and manufacturing method, applied in the field of nickel-based alloy preparation, can solve problems such as cracking, and achieve the effect of overcoming the inability to cold-draw deformation and avoiding the problem of extrusion and delamination

Active Publication Date: 2017-04-26
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for manufacturing a Cr-Ni-Mo-Nb nickel-based alloy seamless pipe. Aiming at the forged pipe billet, the process parameters of hot extrusion and cold working deformation of the alloy pipe are formulated, which solves the problem of cold and hot rolling of the steel pipe. The problem of cracking in the deformation zone, especially the problem of hot extrusion delamination; the microstructure transformation law of the nickel-based alloy was studied, and the problem of intermetallic precipitated phases in the heat treatment of the alloy seamless pipe was solved

Method used

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  • Method for manufacturing Cr-Ni-Mo-Nb nickel base alloy seamless tube
  • Method for manufacturing Cr-Ni-Mo-Nb nickel base alloy seamless tube
  • Method for manufacturing Cr-Ni-Mo-Nb nickel base alloy seamless tube

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Effect test

Embodiment 1

[0051] The design process for the finished product specification Φ25×2mm is as follows:

[0052]Tube blank preparation (Φ219mm) → hot extrusion (Φ140×12mm) → straightening → sawing → pickling → cold rolling (Φ114×10mm) → degreasing → heat treatment → straightening → sawing → pickling → cold rolling (Φ89 ×7mm) → degreasing → heat treatment → straightening → sawing → pickling → cold rolling (Φ57×5mm) → degreasing → heat treatment → straightening → sawing → pickling → cold rolling (Φ38×3mm) → degreasing → heat treatment → Straightening → sawing → pickling → cold rolling (Φ25×2mm) → degreasing → heat treatment → straightening → sawing → pickling → flaw detection → storage

[0053] The specific process is as follows:

[0054] (1) tube blank

[0055] It adopts forged and lathe-finished tube billets, and the specification is Φ219mm. The composition of the tube blank is as follows:

[0056]

[0057] (2) Blank preparation

[0058] Saw the forged tube billet into a 650mm / piece b...

Embodiment 2

[0110] The design process for the finished product specification Φ250×8mm is as follows:

[0111] Raw material preparation (Φ306mm) → hot extrusion (Φ194×22mm) → straightening → sawing → pickling → grinding → lubrication → cold rolling (Φ168×15mm) → degreasing → heat treatment → straightening → sawing → pickling → Lubrication → cold expansion (Φ250×14mm) → degreasing → heat treatment → straightening → sawing → pickling → lubrication → cold rolling (Φ219×8mm) → degreasing → heat treatment → straightening → sawing → pickling → lubrication → cold expansion (Φ250×8mm) → degreasing → heat treatment → straightening → sawing → pickling → flaw detection → storage

[0112] The specific process is as follows:

[0113] (1) tube blank

[0114] The forged tube blank is used, and the specification of the tube blank is Φ306mm. The composition of the tube blank is as follows.

[0115]

[0116] (2) Blank preparation

[0117] Saw the forged tube billet into 600mm / piece billets, and the ...

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Abstract

The invention discloses a method for manufacturing a Cr-Ni-Mo-Nb nickel base alloy seamless tube. The method includes the steps of (1) tube blank forging, (2) blank preparation, (3) hot extrusion, (4) cold working and (5) heat treatment. By the adoption of the method, the hot extrusion and cold working deformation technological parameters of the alloy tube are made as for tube blank forging, and the problem of cracking (especially the problem of hot extrusion layering) in cold and hot rolling deformation zones of the steel tube is solved; and the structural transformation rule of nickel base alloy is studied, and the heat treatment intermetallic precipitated phase problem of the alloy seamless tube is also solved.

Description

technical field [0001] The invention relates to a method for manufacturing a Cr-Ni-Mo-Nb nickel-based alloy seamless pipe, belonging to the technical field of nickel-based alloy preparation. Background technique [0002] With the development of modern industry, the demand for materials is becoming more and more demanding. Traditional stainless steel (304, 316) and iron-nickel-based corrosion-resistant alloys (N08020, N08028, N08825, etc.) can no longer meet production needs. For this reason, the content of corrosion-resistant alloy elements is increased to improve corrosion resistance and high temperature performance. Usually Ni, Cr, Mo, Nb are commonly added alloying elements. The corrosion-resistant alloy involved in this patent is an alloy with high alloy content of Ni, Cr, Mo and Nb, and the proportion of alloy elements reaches more than 90%. To be precise, the alloy is a typical high-temperature nickel-based corrosion-resistant alloy N06625. [0003] The Mo content o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06B21C29/00B21C23/08C22C19/05C22F1/10
CPCB21C23/085B21C29/003B21C37/06C22C19/055C22F1/10
Inventor 聂飞付俊生巩非张琳李鹏拓雷锋范晔峰程逸明侯楠梁祥祥
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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