Specifications Tu 48-19-251-85

1.1 Pipes made of niobium, molybdenum and molybdenum-based alloys shall comply with the requirements of these technical specifications.
1.2 Niobium and molybdenum pipes are separated depending on the method of initial billet production:

• niobium tubes are made from vacuum-melted niobium ingots;
• molybdenum grade MF pipes are made from powdered billets of MF grade molybdenum (pure molybdenum without additives);
• Molybdenum grade MF pipes are made from vacuum-melted ingots, obtained by melting powder billets of MF grade molybdenum with the use of carbon as a reduction agent;
• MBVP molybdenum tubes are made from vacuum-melted ingots produced by melting powder billets of MShV grade molybdenum with boron as a deoxidizer and alloying element.

1.4 Tube length depending on outer diameter and wall thickness.

Outer diameter of tube, mm	0,1	0,2-0,3	0,4-0,6	0,7	1,0	1,5	2,0
6,3-9	50-1500	-	-	-	-	-	-
6,3-14	-	50-1500	50-1500	-	-	-	-
8-14	-	-	-	50-1000	-	-	-
16-18	-	-	-	50-700	-	-	-
8-11	-	-	-	-	50-500	-	-
12-21	-	-	-	-	50-750	-	-
22-32	-	-	-	-	50-1200	-	-
24-32	-	-	-	-	-	50-600	-
17-32	-	-	-	-	-	-	50-300
40-50	-	-	-	-	-	50-500	-

1.5 Depending on the specified outside diameter tolerances, pipes of accuracy classes I and II are produced.
1.5.1 Limit deviations of pipe outside diameter.

Nominal diameter, mm	I class	II class
6,3	-0,10	-0,18
7,0	-0,12	-0,20
8,0	-0,12	-0,20
9,0	-0,12	-0,20
10,0	-0,12	-0,21
11,0	-0,12	-0,22
12,0	-0,12	-0,22
13,0	-0,12	-0,23
14,0	-0,12	-0,23
16,0	-0,13	-0,25
17,0	-0,14	-0,26
18,0	-0,14	-0,27
20,0	-0,15	-0,30
21,0	-0,16	-0,32
22,0	-0,19	-0,34
23,0	-0,19	-0,35
24,0	-0,19	-0,36
25,0	-0,20	-0,38
26,0	-0,20	-0,39
28,0	-0,21	-0,42
29,0	-0,22	-0,44
30,0	-0,23	-0,45
31,0	-0,24	-0,47
32,0	-0,24	-0,48
40,0	-0,24	-0,48
45,0	-0,25	-0,50
50,0	-0,25	-0,50

1.5.2 Maximum deviation of pipe wall thickness.

Wall thickness, mm	I class	II class
0,10	±0,02	±0,03
0,20	±0,02	±0,04
0,30	±0,03	±0,05
0,40	±0,04	±0,06
0,50	±0,05	±0,07
0,60	±0,06	±0,08
0,70	±0,06	±0,08
1,00	±0,08	±0,10
1,50	±0,12	±0,15
2,00	-	±0,25

1.6 Chemical composition of niobium and molybdenum tubes.

Elements	niobium	PM	MHVP	MBVP
Mass fraction of niobium	not less than 99,8440	-	-	-
Mass fraction of molybdenum	-	not less than 99,9430	not less than 99,9172	99,8737-99,8537
Mass fraction of boron	-	-	-	0,0050-0,0250
Mass fraction of impurities, not more
aluminium	-	0,0040	0,0040	0,0020
iron	0,0050	0,0140	0,0140	0,0140
nickel	-	0,0050	0,0050	0,0050
silicon	0,0050	0,0140	0,0140	0,0140
calcium and magnesium (in total)	-	0,0050	0,0050	0,0050
carbon	0,0100	0,0150	0,0300	0,0038
oxygen	0,0100	-	0,0050	0,0050
hydrogen	0,0100	-	0,0008	0,0005
nitrogen	0,0100	-	0,0050	0,0050
tantalum	0,1000	-	-	-
titanium	0,0050	-	-	0,0700
Tungsten and molybdenum (in total)	0,0100	-	-	-

1.7 Pipes shall be straight.
Deviations from straightness shall not exceed 0.1% of the length for Pipes of accuracy class I and 0.5% of the length for Pipes of accuracy class II.
1.8. Pipe ends shall be evenly trimmed and free of burrs.
1.9 Outer and inner surfaces shall be free of cracks, oxides and traces of grease.
Scraping marks, slivers, dents, sinks, burrs that do not allow for pipe dimensions to be outside the allowable tolerances shall not be considered a rejection mark.
1.10. Pipe wall thickness and diameter tolerance shall not exceed the specified tolerance limits.
1.11. Mechanical properties of molybdenum pipe grades MF and MFWP shall conform to the following requirements.

Tube diameter, mm	Wall thickness, mm	Ultimate strength, MPa (kg/mm), not less	Relative elongation, %, min
6.3 to 12.0	all sizes	686 (70)	15,0
13.0 to 14.0	all dimensions	686 (70)	8,0

1.12. The roughness_Ra parameter of outer surface of up to and including 14 mm diameter shall not exceed 1.25 μm; the roughness parameter of inner surface shall not exceed 2.50 μm as per GOST 2789-73.
1.13. On customer's request niobium and molybdenum pipes may be subjected to hydraulic pressure test (leak test).

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