Tu 48-19-88-83. Blanks are molybdenum grinded. Technical conditions.
Are you interested in TU 48−19−88−83 «Molybdenum grinded billets» from the supplier company AvekGlob? Here you will find interesting information on this topic.
Application area
These technical specifications apply to grinded billets of molybdenum, which are used for vacuum adhesions and for parts of electrovacuum devices. The requirements established by the present technical conditions for blanks of molybdenum grinded grades MCH, MK, MPN correspond to the first quality category.
Technical requirements
Molybdenum grinded billets are made of cermet molybdenum of MCH, MK and MPN grades, the characteristics of which should correspond to that indicated in the table:
| Molybdenum brand | Characteristics of the brand |
| MCH | Pure molybdenum, which does not contain additives |
| MK | Molybdenum with an increased content of silicon and alkali; characterized by much more high recrystallization temperature than Molybdenum and higher bending strength in the annealed state |
| MRN | Molybdenum without additives; temperature of molybdenum recrystallization this brand may be slightly higher than that of Molybdenum grade MCH due to the greater content of impurities |
The nominal dimensions of the blanks and the tolerances allowed should correspond to those indicated in the table
| Nominal diameter, mm | Permissible deviation from the nominal diameter, mm | Length, mm | |
| For 1st grade | For the 2nd grade | ||
| from 0.8 to 2.9 every 0.1 | ± 0.02 | -0.10 | from 250 to 1000 |
| «3.0» 5.8 same as 0.2 | ± 0.04 | -0.15 | «250» 1000 |
| «6.0» 8.5 «0.5 | ± 0.06 | -0.20 | «250» 1000 |
| «9.0» 14.0 «0.5 | ± 0.06 | -0.30 | «250» 500 |
| «15.0» 24.0 «1.0 | - | -0.50 | «250» 500 |
Supplier — AvekGlob company — offers molybdenum grinded billets at a reasonable price from the manufacturer, which meet the technical requirements of TU 48−19−88−83. The supplier guarantees the timely delivery of products to any address specified by the consumer.
Chemical composition
It is given in the table:
| Molybdenum brand | The content of impurities and additives,%, not more than | Molybdenum,%, not less than | |||
| Aluminum and iron (in total) | Nickel | Silicon | Calcium and magnesium (in total) | ||
| MCH | 0.018 | 0.005 | 0.014 | 0.005 | 99,958 |
| MK | 0.018 | 0.005 | from 0.019 to 0.037 | 0.005 | 99,935 |
| MRN | 0.025 | 0.020 | 0.014 | 0.005 | 99,936 |
Quality requirements
The blanks must be straight. The deviation from straightness should not exceed 0.5% of the measured length.
On the surface of the blanks are not allowed stratification, cracks, traces of graphite grease and oxides, burrs, fractional strokes and gross lateral risks. Within the permissible deviations in diameter, slight transverse risks from grinding, dents are allowed; On the side of the ends of the blanks chipped, burrs and traces of oxidation of the surface are allowed for a length of no more than 10 mm.
Parameter of roughness of blanks according to GOST 2789−73 Rz — from 20 to 10 mm and Ra 2.5 to 0.63 microns (5−7 cells). As agreed with the manufacturer, the billets can be manufactured with a surface roughness parameter according to GOST 2789−73 Ra0.63 to 0.50 μm (8 cells).
Blanks should not have internal bundles and cracks.
Supplier — AvekGlob Company — offers to purchase molybdenum grinded billets that meet the technical requirements of TU 48−19−88−83. Products can be bought at a price formed on the basis of European and world standards of production. Implementation is possible in bulk and retail, for regular customers, a flexible system of discounts operates.