Forged Molybdenum Rod
The formation process of molybdenum rods is carried out through powder metallurgy technology.
The main grades include Mo1 pure molybdenum rods, Mo-La molybdenum-lanthanum alloy rods, and TZM titanium-zirconium-molybdenum rods.
As is well known, the melting point of molybdenum is 2622℃.
It has high melting point, high thermal conductivity, low thermal expansion, good high-temperature strength, and excellent performance in vacuum/inert atmosphere.
In an air environment above 600℃, molybdenum rods will rapidly oxidize and volatilize trivalent molybdenum. Therefore, molybdenum rods cannot be used in high-temperature air for a long time.
The surface condition of molybdenum rods is divided into forged black rods, acid-washed rods, and polished rods.
The products are widely used in high-temperature furnaces, electro-vacuum, semiconductors, glass industries, drawing blanks, electrodes, and machining parts.
comparison of product parameters
| Products name | Molybdenum rods |
| Large-diameter molybdenum rod | Φ30‑100mm |
| Manufacturing process | Forging |
| Surface | Black / Ground / Pickled |
| Diameter tolerance | +/-1.0 to +/-5.0mm |
During the production and manufacturing process of molybdenum rods, the following issues need to be paid attention to:
1. Oxygen content and impurity control (Mo powder is prone to oxygen absorption, and the entire sintering process must be protected by hydrogen. If the oxygen content exceeds the standard, the molybdenum rods will become brittle, and subsequent machining and drawing are prone to cracking and breakage; if Fe, Si, C, N impurities exceed the standard, it will cause leakage of vacuum devices and premature failure of high-temperature use).
Our molybdenum rods are strictly prevented from oxidation during each transfer and heating process, and the oxygen content of the finished products is strictly controlled to improve the processing efficiency of customers and reduce processing losses and costs.
2. Sintering density and core porosity, microcracks
If the sintering temperature and holding time are not controlled properly, there will be core holes and micro-porosity in the rod material. For large-diameter molybdenum rods, the risk is higher. Our large-sized molybdenum rods, after sufficient selection and large deformation hot processing, have greatly reduced the cracking and scrap situations of large-sized molybdenum rod products during machining, deep processing, and high-temperature cyclic loading.
3. Narrow hot spinning/hot rolling process window, low-temperature brittleness
Molybdenum is a brittle metal, with poor plasticity below 800℃. The temperature for spinning opening and single pass deformation must be strictly controlled; too low temperature and excessive single pass reduction will cause folding and micro-cracks on the surface, which cannot be completely removed even after grinding polishing, and the machining will cause cracking and chip shedding during turning.
The process difficulty of large-diameter thick rods and thin rods is greatly different: for thin rods (＜Φ5mm), the difficulty is straightness and no distortion, to prevent subsequent drawing from breaking; however, for large-diameter rods, the difficulty is controlling ellipticity and uniformity of internal structure.
4. Grain control (distinguishing pure molybdenum / molybdenum-lanthanum alloy)
• The recrystallization temperature of Mo1 pure molybdenum is 900-1100℃. Improper heat treatment will result in coarse grains and severe brittleness after high-temperature use.
• Mo-La molybdenum-lanthanum alloy relies on lanthanum to refine grains. Inhomogeneous powder mixing will cause local composition deviations, inconsistent high-temperature anti-sagging performance, and performance fluctuations in the same batch.
5. Straightening, dimensional tolerance, straightness
The molybdenum rods after forging are bent and require multiple passes of hot-cold straightening. The straightness of thin rods is difficult to guarantee; many suppliers can only achieve ordinary forging tolerance; for high-precision polished rods, it is necessary to perform centerless grinding, which requires high equipment and grinding parameter requirements, resulting in a significant increase in cost.
6. Surface defect control
Forged rods are prone to forging marks, oxide scales, indentation, and fine cracks; if the grinding parameters of polished rods are incorrect, the surface will produce grinding burn, causing brittleness in the surface layer, and it is prone to chipping during machining.
Contact person : Tracy
Our address
Baoji city, shaanxi province ,China
Phone Number
0086-18291730106
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