Ultralow-oxygen dual-phase steel 2507 powder preparation method

A technology for powder preparation and dual-phase steel is applied in the field of ultra-low oxygen dual-phase steel 2507 powder preparation. Effects of uneven texture, correctness and uniformity

Inactive Publication Date: 2018-11-13
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional powder preparation methods, such as gas atomization and water atomization, etc., produce two-way stainless steel powder with high oxygen content. In the later powder molding process, high oxygen content will lead to a significant decrease in the mechanical properties of the molded parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing ultra-low oxygen dual-phase steel 2507 powder, comprising the following steps:

[0019] Step 1, smelting of dual-phase steel 2507 master alloy rod; the alloy composition is carried out according to GB / T20878-2007;

[0020] Step 2, machining the dual-phase steel 2507 alloy master alloy billet, the diameter of the electrode rod after processing is 90mm, the length is 1000mm, and the deviation of the straightness of the electrode rod is controlled at 0.1mm / m;

[0021] Step 3, place the dual-phase steel 2507 alloy electrode rod in a closed reaction chamber containing helium and rotate it at high speed, and use a plasma gun to heat the end of the electrode rod to melt it;

[0022] Step 4, the molten metal of the electrode rod in step 3 is atomized and flies out under the action of centrifugal force to form fine liquid droplets, which are rapidly cooled in He gas to form spherical particles, which fall into the collection container at the bottom of the ...

Embodiment 2

[0025] A method for preparing ultra-low oxygen dual-phase steel 2507 powder, comprising the following steps:

[0026] Step 1, smelting of dual-phase steel 2507 master alloy rod; the alloy composition is carried out according to GB / T20878-2007;

[0027] Step 2, machining the dual-phase steel 2507 alloy master alloy billet, the diameter of the electrode rod after processing is 45mm, the length is 550mm, and the straightness deviation of the electrode rod is controlled at 0.05mm / m;

[0028] Step 3, place the dual-phase steel 2507 alloy electrode rod in a closed reaction chamber containing inert gas containing argon and rotate it at high speed, and use a plasma gun to heat the end of the electrode rod to melt it;

[0029] Step 4, the molten metal of the electrode rod in step 3 is atomized and flies out under the action of centrifugal force to form fine droplets. The droplets are rapidly cooled in He+Ar gas to form spherical particles and fall into the collection container at the b...

Embodiment 3

[0032] A method for preparing ultra-low oxygen dual-phase steel 2507 powder, comprising the following steps:

[0033] Step 1, smelting of dual-phase steel 2507 master alloy rod; the alloy composition is carried out according to GB / T20878-2007;

[0034] Step 2, machining the dual-phase steel 2507 alloy master alloy billet, the diameter of the electrode rod after processing is 10mm, the length is 100mm, and the straightness deviation of the electrode rod is controlled at 0.01mm / m;

[0035] Step 3, place the dual-phase steel 2507 alloy electrode rod in a closed reaction chamber with inert gas argon and rotate it at high speed, and use a plasma gun to heat the end of the electrode rod to melt it;

[0036] Step 4, the molten metal of the electrode rod in step 3 is atomized and flies out under the action of centrifugal force to form fine droplets, which are quickly cooled in Ar gas to form spherical particles, which fall into the collection container at the bottom of the atomization...

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Abstract

The invention discloses an ultralow-oxygen dual-phase steel 2507 powder preparation method. The method comprises the following steps that 1, a double-phase steel 2507 mother alloy bar is smelted; 2, the diameter of an electrode rod machined by the double-phase steel 2507 alloy bar is 30-90 mm, and the length is 100-1000 mm; 3, the electrode rod is placed in a reaction chamber containing inert gasfor high-speed rotation, the end of the electrode rod is heated by a plasma gun with the power of 200-300 kW, so that the end of the electrode rod is melted; and 4, the molten metal is atomized and then flies out under the action of centrifugal force to form fine liquid drops, the liquid drops are rapidly cooled in protective gas to form spherical particles, the spherical particles fall into a bottom collector of an atomizing chamber to obtain the spherical powder of the double-phase steel 2507 alloy. The double-phase steel 2507 alloy spherical powder prepared by the method has the characteristic of extremely low in oxygen increasing quantity.

Description

technical field [0001] The invention belongs to the technical field of alloy spherical powder preparation and designs a method for preparing ultra-low oxygen dual-phase steel 2507 powder. Background technique [0002] Duplex stainless steel has become an important engineering material, widely used in petrochemical, offshore and coastal facilities, oil field equipment, papermaking, shipbuilding, environmental protection and other fields. 207 duplex steel is developed on the basis of the second-generation duplex stainless steel 2205. Currently, there are SAF2507, S32750, 00Cr25NiMo4N and other grades. The structure of 2507 stainless steel is composed of austenite and ferrite, and has both austenitic stainless steel and iron The dual characteristics of ferritic stainless steel have a lower thermal expansion coefficient and higher thermal conductivity than austenitic stainless steel and ferritic stainless steel, and have high resistance to pitting corrosion, crevice corrosion, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/10
CPCB22F9/10
Inventor 宋嘉明瞿宗宏康路王庆相梁书锦张平祥
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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