Specifications Tu 48-19-272-83

Molybdenum strips not annealed shall comply with the requirements of these technical specifications. 1. 2.
1.2 The grades
Rings and wires are made from powder billets of molybdenum grade MF and vacuum-melted ingots of MFVP grade, obtained by melting powder billets of MF molybdenum grade.
1.2.1 Depending on how the initial billet is obtained:

• MF grade strips are made from sintered molybdenum billets corresponding to MF grade (pure olibdenum without additives);
• PM PM HP grade strips are made from vacuum-melted ingots produced by melting sintered molybdenum billets of PM grade with the use of carbon as a deoxidant).

1.2.2 Depending on the method of rolling:

• cold-rolled strips with thickness from 0.1 to 0.5 mm, rolled in two mutually perpendicular directions (P2);
• hot-rolled 0.6 to 6.0 mm strips, rolled in one direction.

1.2.3 Depending on manufacturing accuracy in thickness: grades 1 and 2.
1.3 The dimensions of strips and allowable deviations shall meet the following requirements.

Cold-rolled
Thickness	Tolerances Grade 1	Tolerances of the 2nd class.	PM width	IF length	CBM width	CDM length
0.10 to 0.20 in 0.05 ± 0.02	± 0,02	± 0.02 or - 0.04	50 to 250	150 to 700	50 to 250	1 50 to 800
0.25 to 0.35 over 0.05	± 0,02; ± 0,04	± 0,03; - 0,06	--- "---	from 150 to 600	--- "---	from 1 50 to 700
from 0,40 to 0,5 through 0,05	± 0.03 or- 0.06	± 0,04; - 0,08	--- "---	100 to 250	--- "---	1 00 to 600
Hot-rolled
0.6 to 0.6 in 0.1	-	± 0,05; - 0,1	50 to 250	100 to 250	50 to 250	100 to 250
1.0 to 1.9 in 0.1	-	± 0,06; - 0,12	from 40 to 150	--- "---	from 50 to 200	--- "---
2.0 to 3.0 in 0.2	-	± 0,1; - 0,2	30 to 100	80 to 250	from 50 to 200	--- "---
from 3.25 to 6.0 over 0.25	-	+ 0.12 to 0.13 or - 0.25	-	-	50 to 200	--- "---

1.4 Chemical composition.

Component name	PM	MFVP
Mass fraction of molybdenum, %, not less	99,95	99,9172
Mass fraction of impurities, %, max
iron	0,014	0,014
aluminum	0,004	0,004
nickel	0,005	0,005
silicon	0,012	0,014
calcium and magnesium (in total)	0,005	0,005
carbon	0,01	0,03
oxygen	-	0,0050
hydrogen	-	0,0008
nitrogen	-	0,005

1.5 Strip with thickness over 2 mm is supplied without edge trimming. Strip not thicker than 2 mm is cut on all sides. Tears and burrs on the edges are not allowed. 1.6. The surface of cold-rolled strips must be degreased, hot-rolled strips - cleaned from the oxide film.
The surface shall be free of delaminations, cavities, oxides, mechanical damages. Minor local defects not exceeding the thickness tolerances are allowed: dents, impressions of rolls, scratches, roughness, traces of brushing. Surface roughness parameter of cold rolled strips according to GOST 2789-73 must be Ra from 2.5 to 1.5.
1.7 It is allowed to have waviness on strips not thicker than 0,2 mm, which disappears when rolled up in a cylinder with a diameter of (50-60) mm. 1.8. Molybdenum strip not thicker than 0.5 mm is rolled
In two directions. The direction of rolling is changed by 90° after a total deformation of at least 80% from the beginning of processing. 1.9. In the cold state, strips with thickness up to 0.5 mm must withstand bending to the parallelism of the sides around the mandrel with a radius:

• for strips not thicker than 0.2 mm - 0.2 mm;
• for strips of thickness from 0,25 to 0,3 mm - 0,5 mm;
• for strips with thickness from 0,35 to 0,5 mm - 1,0 mm.

There shall be no breaks and delaminations in the bends.
1.10. Mechanical properties of cold rolled strip (along the rolling direction) must meet the following requirements.

Thickness, mm	Tensile strength, kgf/mm2, not less	Relative elongation, %, no less than
0,1	80	1
0,2	80	1
0,3	90	1
0,4	90	1
0,5	90	2

Supplier

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