1. Marks. Assortment. Tu 48-19-69-80.

1.1 High-purity molybdenum comes in the form of stack and powder.
Grades of molybdenum, depending on the application.

Grade	Molybdenum name	Field of application
SSH-1	Molybdenum rods	Production of special alloys
MSHCH-2	Molybdenum rods	Electrodes
MHR	Molybdenum powder	Production of special alloys

1.2 Stack sizes.

Marks	Sectional side	Limit deviations of the cross-sectional area	Length, not less
MSHCH-1	16,5	±1,5	350
MSHCH-2	16,5	±1,5	460

2 Technical requirements.
2.1 Molybdenum rods and powder must comply with the requirements of these specifications.
2.2 Chemical composition.

Component name	MShCH-1 and MShCH-2	MSHR
Mass fraction of molybdenum, %, min	99,77	99,7
Mass fraction of determinable impurities, %, max.
aluminum	0,0010	0,0010
iron	0,005	0,005
silicon	0,003	0,003
magnesium	0,0010	0,001
carbon	0,005	0,009
sulfur	0,004	0,004
phosphorus	0,004	0,004
arsenic	0,001	0,001
tin	0,0001	0,0001
lead	0,0001	0,0001
cadmium	0,0001	0,0001
bismuth	0,0001	0,0001
copper	0,001	0,001
zinc	0,001	0,001
tungsten	0,2	0,2
oxygen	0,004	0,25
nitrogen	0,002
hydrogen	0,001

2.3 The rods must not have on the surface fat and oil stains and colors of discoloration.
2.4 Molybdenum rods must have a crystalline fracture.
The fresh fracture must be light gray in color.
For rods of MShCh-1 grade, the presence of cleavage, surface cracks, chips, shells, melting is not a defective feature.
On the surface of MShCh-2 grade rods uneven cracks, chips and traces of melting are not allowed.
2.5 Straightness of MShCh-2 grade rods must not exceed 2 mm for the length of the rods.
Non-rectangularity is allowed up to 3 mm in quantity up to 25% of the batch of pins.
2.6 The powder must be gray with no extraneous inclusions.
2.7 The powder must contain not less than 92% of grains up to 5 microns in size.

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