GOST 22720.0-77
GOST 22720.0−77 Rare metals and alloys on their basis. General requirements for methods of determination of oxygen, hydrogen, nitrogen and carbon (with Change No. 1)
GOST 22720.0−77
Group B59
STATE STANDARD OF THE USSR
RARE METALS AND ALLOYS ON THEIR BASIS
General requirements for methods of determination of oxygen, hydrogen, nitrogen and carbon
Rare metals and their alloys. General requirements for the methods of determination of oxygen, hydrogen, nitrogen and carbon
AXTU 1709*
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* Introduced advanced Edit. N 1.
Date of introduction 1979−01−01
The decision of the State standards Committee of the Council of Ministers of the USSR from September 29, 1977 N 2341 introduction installed from 01.01.79
Proven in 1983 by the Decree of Gosstandart from 27.07.83 3511 N validity extended to 01.01.89*
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* Expiration removed by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS No. 5/6, 1993). — Note the manufacturer’s database.
REPRINTING. November 1983
The Change N 1, approved and put into effect by the Decree of the USSR State Committee for standards from
Change No. 1 made by the manufacturer of the database in the text IUS N 5, 1988
1. This standard establishes General requirements for methods of determination of oxygen, hydrogen, nitrogen and carbon.
2. The selection and preparation of samples are produced according to current technical documentation on rare metals and alloys on their basis.
3. Methods of analysis allow to determine oxygen, hydrogen, nitrogen, and carbon in binary alloys, whose composition is given in table.1.
Table 1
| The metal, which is the basis of alloy |
The mass fraction of the component in the alloy, %, no more |
| Cubic Zirconia |
Aluminium 15 |
| Molybdenum 50 | |
| Niobium 10 | |
| Titan 5 | |
| Hafnium |
Zirconium 20 |
| Niobium 20 | |
| Tantalum 20 | |
| Aluminum 5 | |
| Silicon 3 | |
| Titan 10 | |
| Nickel 10 | |
| Vanadium |
Zirconium 25 |
| Niobium 20 | |
| Aluminium 15 | |
| Chrome 15 | |
| Molybdenum 30 | |
| Tantalum 20 | |
| Tungsten 10 | |
| Tantalum |
Tungsten 15 |
| Terbium 10 | |
| Tungsten |
Rhenium 30 |
| Tantal 5 | |
| Gallium |
Indium 25 |
| Tin 50 | |
| Copper 80 | |
| Nickel 40 | |
| Lantan |
Nickel 60 |
| Cobalt 15 | |
| Praseodymium |
Cobalt 60 |
| Gadolinium |
Samarium 20 |
| Iron | |
| Niobium |
Molybdenum 5 |
| Zirconium 25 | |
| Aluminium 15 | |
| Titan 40 | |
| Germanium 6 | |
| Silicon 5 | |
| Tungsten 15 | |
| Molybdenum 5 | |
| Vanadium 10 | |
| Hafnium 1,5 | |
| Tantalum 30 | |
| Molybdenum |
Rhenium 50 |
| Indium |
Copper 60 |
| Cerium |
Mischmetal |
| Samarium |
Cobalt 70 |
| Copper 30 | |
| Praseodymium 20 | |
| Terbium |
Zirconia 10 |
| Iron 10 | |
| Nickel 10 |
4. The content of impurities in the analyzed materials is determined in two parallel batches, weighed with an accuracy of not more than 0.001 g.
The final result of the analysis taking the arithmetic mean of the results of the two definitions.
Simultaneously with the analysis under the same conditions is carried out two test experience for inclusion in the analysis result of the relevant amendment.
5. To verify the correctness of analyses using standard samples (CO) or vary the sample.
5.1. In table.2 shows the standard samples used to verify the correctness of analysis in the determination of oxygen, nitrogen and carbon.
Table 2
| The designated element |
The designation of the standard and paragraph number |
Standard samples |
| Oxygen |
GOST 22720.1−77пп.4.1.1−4.1.4 | Steel SG-1 (N 81−71 in the state Register) Steel SG-3 (N 577−74 to Register) |
| GOST 22720.1−77пп.4.1.5−4.1.7 | Steel SG-2 (N 416−73 to Register) | |
| Nitrogen | ||
| GOST 22720.1−77 |
Steel SG-2 Niobium N 304 | |
| GOST 22720.4−77 |
Niobium N 304 Titan N 302 | |
| Carbon |
GOST 22720.1−77 |
Steel N 126 Steel N 263 Niobium N 304 |
| GOST 22720.3−77 |
Niobium N 304 WITH steels with a carbon content close to the designated |
Use industry standard samples of rare metals and standard samples of enterprises certified in accordance with GOST 8.315−78.
For control of correctness of determination of hydrogen produced standard samples of enterprises of titanium or zirconium.
If the difference between the result of the determination of impurities and the impurity content in the standard sample exceeds allowable absolute differences, then check the correct operation of the installation and of the analysis and then repeat the analysis of the test and standard sample.
5.2. Analyze two samples that differ in mass by 1.5−2 times. If the difference between the results exceeds the permissible value of the absolute differences, check the correct operation of the unit and of the analysis and then repeat the analysis.
5.3. Allowed the use of other instruments of equal precision metrological characteristics given in the relevant standard methods of analysis.
(Added, Rev. N 1).
6. Safety requirements.
6.1. Rare metals and alloys on their basis in the working area do not form toxic substances and belong to the fourth class of danger.
6.2. Laboratory spaces where chemicals are treated batches must be equipped with ventilation systems according to GOST 12.4.021−75.
6.3. Performing tests on the equipment with the use of mercury should be carried out in accordance with the current sanitary rules of design, equipment, operation, and maintenance of production and laboratory premises, intended for work with mercury, its compounds and devices with mercury filling, approved by the Ministry of health of the USSR.
6.4. When you use gases in cylinders must comply with the safety requirements in accordance with the rules for design and safe operation of vessels working under pressure, approved by Gostekhnadzor of the USSR.
6.5. Fire safety laboratory spaces shall be provided in accordance with the requirements of GOST 12.1.004−85*. The premises of the lab should be equipped with means of extinguishing (sand, asbestos sheet or asbestos cloth, fire extinguishers).
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* On the territory of the Russian Federation GOST 12.1.004−91. — Note the manufacturer’s database.
Section 6. (Added, Rev. N 1).
