Tu 48-19-88-83. Ground molybdenum blanks. Technical specifications.
1. technical requirements
1.1 Basic parameters and dimensions
| Grade of molybdenum | Grade characteristic |
|---|---|
| MF | Pure Molybdenum without additives |
| MK | Molybdenum with silica-alkali additive; characterized by a much higher recrystallization temperature than MF grade molybdenum and higher annealed bending strength |
| MRN | Molybdenum without additives; recrystallization temperature of this molybdenum grade may be slightly higher than HM molybdenum due to its higher content of impurities. |
1.1.2 Nominal billet dimensions.
| Nominal diameter, mm | Tolerances of the 1st cl. | Tolerances of the 2nd class. | Length, mm |
| 0.8 to 2.9 incl. every 0.1 | ±0,02 | -0,10 | from 250 to 1000 |
| " 3,0 "5,8 same 0,2 | ±0,04 | -0,15 | --- "--- |
| " 6,0 "8,5 "0,5 | ±0,06 | -0,20 | --- "--- |
| " 9,0 "14,0 "0,5 | ±0,06 | -0,30 | 250 to 500 |
| " 15,0 "24,0 "1,0 | - | -0,50 | from 250 to 500 |
1.1.4 Chemical composition.
| Grade of molybdenum | Al+Fe in total | Nickel | Silicon | Ca+Mg in total | Mo, %, |
| MF | 0,018 | 0,0050 | 0,014 | 0,005 | 99,958 |
| MK | 0,018 | 0,005 | 0.019 to 0.037 | 0,005 | 99,935 |
| MRN | 0,025 | 0,020 | 0,014 | 0,005 | 99,936 |
1.1.5 The blanks must be straight. Deviation from straightness shall not exceed 0.5% of the measured length.
1.1.6 No delaminations, cracks, traces of graphite grease and oxides, burrs, grain strokes and coarse transverse risks are allowed on the surface of the workpieces.
Within the permitted deviations in diameter, minor transverse risks from grinding, dents are allowed; chipping, burrs and oxidation marks on the surface at a length of not more than 10 mm are allowed from the end faces of workpieces.
1.1.7 Rz from 20 to 10 mm andRa 2,5 to 0,63 microns (vv 5-7 cl).
Supplier
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