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Manufacturing method of alloy tubular product

A manufacturing method and pipe technology, applied in the field of manufacturing, can solve the problems of narrow processing temperature range, large thermal deformation resistance, low yield, etc., and achieve the effects of low production cost, good performance and high yield.

Active Publication Date: 2012-07-04
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, it is quite difficult to process a corrosion-resistant alloy pipe with high room temperature strength and high temperature strength, considering the pipe processing technology; the technical difficulty lies in: high thermal deformation resistance, good thermoplasticity processing temperature The interval is narrow, and many manufacturers in the world generally use the extrusion process to manufacture NS1402 alloy blank tubes, but this production process has disadvantages such as high cost and low yield

Method used

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  • Manufacturing method of alloy tubular product
  • Manufacturing method of alloy tubular product
  • Manufacturing method of alloy tubular product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of manufacturing method of NS1402 alloy pipe, is to adopt the processing technology of cross-rolling piercing+cold rolling to produce many batches of NS1402 pipe, now choose 2 heat batch numbers as embodiment, concrete steps are as follows:

[0025] a. Cut the Φ95 bar of NS1402 alloy into 750mm short material, and center the center of the short material by drilling;

[0026] b. Heat the centering material to 950°C for 30 minutes, then heat it up to 1120°C for 20 minutes, and then hot-pierce it into a cold-rolled Φ98*8.0mm tube blank; the specific piercing parameters are shown in Table 1:

[0027] Table 1:

[0028]

[0029] c. Roll the Φ98*8.0mm tube billet for 3 passes to produce a Φ25*2.0 cold-rolled tube;

[0030] d. The above-mentioned cold-rolled pipe is subjected to solution treatment in a protective atmosphere:

[0031] Solid solution temperature of semi-finished products: 1060°C, holding time: 0.5 hours, using hydrogen protection heating;

[0032] So...

Embodiment 2

[0049] A method for manufacturing an alloy pipe, comprising the following steps:

[0050] a. Smelting: Using pure iron and other metals as raw materials, the composition and weight percentage are mainly carbon (C)≤0.05%, silicon (Si)≤0.5%, chromium (Cr) through vacuum induction furnace + electroslag remelting process ) 19.5-23.5%, nickel (Ni) 38.0-46.0%, molybdenum (Mo) 2.5-3.5%, manganese (Mo) ≤ 1.0%, copper (Cu) 1.5-3.0%, titanium (Ti) 0.6-1.2%, Sulfur (S) ≤ 0.015%, phosphorus (P) ≤ 0.03%, aluminum (Al) ≤ 0.2%, the balance is iron (Fe) alloy steel; and made into bars;

[0051] b. Centering: Saw the bar into short cuts, and center the short cuts to make centering materials;

[0052] c. Tube billet making: heat the centering material to 950°C and keep it warm for 20-30 minutes, then heat it up to 1100°C-1120°C and keep it warm for 15-20 minutes, and then make a tube blank (required for cold rolling) by hot piercing ;

[0053] d. Cold rolling: the tube billet is rolled for 1...

Embodiment 3

[0058] A manufacturing method of NS1402 alloy pipe, comprising the following steps:

[0059] a. Smelting: Using pure iron and other metals as raw materials, the composition and weight percentage are mainly carbon (C)≤0.05%, silicon (Si)≤0.5%, chromium (Cr) through vacuum induction furnace + electroslag remelting process ) 19.5-23.5%, nickel (Ni) 38.0-46.0%, molybdenum (Mo) 2.5-3.5%, manganese (Mo) ≤ 1.0%, copper (Cu) 1.5-3.0%, titanium (Ti) 0.6-1.2%, Sulfur (S) ≤ 0.015%, phosphorus (P) ≤ 0.03%, aluminum (Al) ≤ 0.2%, the balance is iron (Fe) alloy steel; and made into bars;

[0060] b. Centering: Saw the bar into short cuts, and center the short cuts to make centering materials;

[0061] c. Tube billet making: heat the centering material to 950°C and keep it warm for 25 minutes, then heat it up to 1100°C to 1120°C and keep it warm for 18 minutes, and then make a tube blank (required for cold rolling) by hot piercing;

[0062] d. Cold rolling: the tube billet is rolled for 3 p...

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Abstract

The invention discloses a manufacturing method of an alloy tubular product. The manufacturing method is characterized in that the method comprises the the steps of melting NS1402 alloy steel to be made into rods; sawing the rods into short cut materials, centering the short cut materials, and manufacturing the short cut materials into centering materials; heating the centering materials to the temperature being 950 DEG C, keeping the temperature for 20-30min, then heating the centering materials to the temperature being 1100 DEG C-1120 DEG C, and keeping the temperature for 15-20min, and subsequently, conducting hot punching on the centering materials to be manufactured into a tube blank; rolling the tube blank by 1 to 5 passes so as to manufacture the tube blank into a cold rolled tube; and conducting protective atmosphere solution treatment on the cold rolled tube to manufacture the alloy tubular product. Due to the adoption of the method, the production process is relatively simple, the yield is high, the production cost is low, the performance of the tubular product is good, and the produced alloy tubular product can be widely applied to the fields such as oil, chemical industry and the like.

Description

technical field [0001] The invention belongs to a method for manufacturing corrosion-resistant alloy pipes, relates to a method for manufacturing alloy pipes, and is particularly suitable for manufacturing NS1402 (UNS N08825) alloy pipes. Background technique [0002] With the development of my country's national economy, the demand for petroleum products is increasing day by day, and the number of domestically processed imported high-sulfur crude oil is also increasing year by year. Wide range of applications. However, with the deterioration of the processed raw oil, the corrosion and leakage problems of the hydrogenation high-pressure air cooler made of carbon steel, an important equipment of the hydrogenation unit, have become more and more prominent. For this reason, the petrochemical department requires domestic refineries that process high-sulfur crude oil to use NS1402 (UNS N08825) alloy as the main material of high-pressure air coolers in new hydrocracking and residu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B23/00C22C38/50C21D9/08
Inventor 吴勇军方轶罗通伟税安烈杨亚光李守军周茂华何云华苏承龙石军刘焕统
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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