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Molybdenum-base rare earth powder metallurgy forming plug and manufacturing method thereof

A manufacturing method and technology of rare earth powder, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of low service life, damage, etc., and achieve the effect of ensuring the quality of strong ultrasonic refinement, dispersion and homogeneity

Active Publication Date: 2012-01-25
四平市北威钼业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention aims at the causes of molybdenum plugs such as low service life and severe damage, and proposes "molybdenum-based rare earth powder metallurgy forming plug and its manufacturing method", thereby solving the above-mentioned disadvantages

Method used

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  • Molybdenum-base rare earth powder metallurgy forming plug and manufacturing method thereof
  • Molybdenum-base rare earth powder metallurgy forming plug and manufacturing method thereof
  • Molybdenum-base rare earth powder metallurgy forming plug and manufacturing method thereof

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Embodiment Construction

[0094] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0095] 1. Four kinds of rare earth oxides and a larger doping ratio are mixed into the pure phase powder at the same time. According to the best compatibility, the base number based on the weight of pure molybdenum powder is:

[0096] ZrO 2 Mixed with 1.3~1.4% Y 2 o 3 Mixed with 0.4~0.6%

[0097] La 2 o 3 Doped with 2.4~2.6% Se 2 o 3 Mixed with 1.2~1.4%

[0098] The total blending ratio is up to 6.0%.

[0099] The basis for determining this batching and grouping technology plan is because:

[0100] A. The coefficients of thermal expansion of these four rare earth metals are very close to those of molybdenum. Under high-temperature working conditions, it can maintain the anti-deformation ability that is basically synchronized with the parent metal molybdenum.

[0101] B. These four rare earth metals have higher melting points and boiling points, ZrO...

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Abstract

The invention relates to a seamless steel tube, in particular to a molybdenum-base rare earth powder metallurgy forming plug used by a high nickel-chromium stainless steel seamless pipe and a manufacturing method thereof. The manufacturing method of the molybdenum-base rare earth powder metallurgy forming plug comprises the following steps of: simultaneously mixing four rare earth oxides of ZrO2,Y2O3, La2O3 and SC2O3 in pure molybdenum powder; mixing molybdenum-base material to prepare powder by using an ultrasound characteristic; packaging the powder into a vane mixing blender, dispersing mixed molybdenum-base rare earth powder by primary refining; dispersing homogenized molybdenum-base rare earth powder by ultrasound refining through an ultrasound transducer; screening by a 180-mesh equalizing screen in accordance with a configured Tyler standard in a 'vibrating screen classifier' to obtain screen under flow, namely blended qualified molybdenum-base rare earth powder; and manufacturing the molybdenum plug by an isostaticmoulding mold, demolding and cleaning, and finishing the manufacturing in a configured hydrogen atmosphere roaster, a hydrogen atmosphere pre-sintering furnace and a hydrogen atmosphere horizontal intermediate frequency furnace. The molybdenum-base rare earth powder metallurgy forming plug and the manufacturing method thereof can be widely applied to chemical industry, metallurgy, machinery, aviation, national defense and other industrial departments.

Description

technical field [0001] The invention relates to a seamless steel pipe, in particular to a molybdenum-based rare earth powder metallurgy forming plug used for a high-nickel-chromium stainless steel seamless pipe and a manufacturing method thereof. Background technique [0002] Seamless steel pipes, especially high-nickel-chromium stainless steel seamless pipes are very important products in national economic construction, and are widely used in chemical industry, metallurgy, medicine, food, machinery, aviation, national defense and other industrial sectors. At present, in the production and manufacture of seamless steel pipes, countries all over the world are basically adopting the "plug hot piercing forming" technology. Therefore, choosing to use "molybdenum plugs" with good high-temperature red hardness, high strength, stable cold and heat fatigue resistance, good surface quality, and excellent workability is an important factor to ensure the forming and quality of seamless...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F5/00B22F3/16B22F1/00B21B25/00
Inventor 冯驰王淑平
Owner 四平市北威钼业有限公司
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