Powder warm-compaction near-net molded molybdenum-based rare earth alloy top and manufacturing technology thereof

Abstract

The invention discloses a powder warm-compaction near-net molded molybdenum-based rare earth alloy top and a manufacturing technology thereof. The manufacturing technology comprises key technologies of scientific proportioning of multi-element composite materials, ultrasonic homogenous solid-phase blending, flexible warm-compaction near-net molding, continuous successive sintering shaping and the like, and special technological devices matched with the key technologies in use, an operation technology procedure and technology parameters are also involved in the manufacturing technology. Hot piercing molding operation adopted in the seamless steel pipe manufacturing industry, especially the high-nickel-chromium thick-wall stainless steel seamless tube manufacturing industry is provided with the new high-tech powder metallurgy warm-compaction near-net molded molybdenum-based rare earth alloy top product which has the beneficial effects of good high-temperature red hardness, high strength, high cold and hot fatigue resistance stability, long service life, good working quality and the like. The manufacturing technology has the outstanding beneficial effects that the system is complete and comprehensive, the technology is advanced and reliable, the number of configured devices is less, and the operation cost is low. By the adoption of the manufacturing technology, industrial volume production can be achieved. After the manufacturing technology is applied and popularized, a large amount of precious resources such as rare precious metals molybdenum and rare earth can be greatly saved.

Description

technical field [0001] The patent of the present invention relates to a hot piercing forming tool for manufacturing seamless steel pipes, in particular to a molybdenum-based rare earth alloy plug for manufacturing high-nickel-chromium thick-walled stainless steel seamless pipes for hot piercing and forming by powder metallurgy, warm pressure, and near-net shape. Preparation technology. Background technique [0002] Seamless steel pipes, especially high-nickel-chromium thick-walled stainless steel seamless pipes are very important basic products for national economy and national defense construction, not only widely used, but also in huge demand. At present, the production and manufacture of seamless steel pipes in all countries in the world basically adopts the technology of "head hot piercing forming". The piercing forming plug is an important factor to improve the forming quality and production efficiency of seamless steel pipes, and it is also a hot scientific research t...

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Problems solved by technology

[0008] The patent of this invention aims at the deficiencies and weaknesses of the current domestic production and manufacture of powder metallurgy molybdenum-based alloy forming plugs. By adopting the technical measures of scientific proportioning of multi-component materials, the problem of low recrystallization temperature and easy brittleness in choosing metal molybdenum as the base material is solved. broken, poor mechanical and physical properties, poor fluidity and other technical problems; through the adoption of ultrasonic homogeneous solid-phase mixing technology measures to solve the problem of solid-phase mixing of molybdenum-based rare earth alloy powder can refine the grain size of ingredients and strengthen ingredients Technical problems such as the dispersion and homogeneity of components; through the adoption of flexible warm-pressing near-net-shaping technology measures, the use of special technical equipment to obtain a near-net-shaped green body of the plug, greatly improve the density and strength of the green body, and eliminate the internal structure of the green body Defects and other technical problems; through the adoption of continuous successive sintering technical measures to solve technical problems such as the use of general-purpose technical equipment to make the formed body shrink and compact, and the technical performance to be stably improved, a powder metallurgy with substantial technological progress and outstanding benefits has been formed. The warm-pressed near-net-shape molybdenum-based rare earth alloy plug and its preparation technology provide a high-temperature red hardness, high strength, stable cold and heat fatigue resistance, With outstanding features such as small thermal expansion coefficient, long service life, and good operation quality, it can realize industrialized batch production of high-tech products of powder metallurgy warm-pressed near-net-shaped molybdenum-based rare earth alloy plugs

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