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1、USSR STATE STANDARD METALLIC MANGANESE AND NITRIDED MANGANESE SPECIFICATIONS GOST 6008-90 (CMEA STANDARD 497-89) Official Edition USSR STATE COMMITTEE FOR PRODUCT QUALITY MANAGEMENT AND STANDARDS Moscow UDC 669.74:006.354Group 12 USSR STATE STANDARD METALLIC MANGANESE AND NITRIDED MANGANESE Specific
2、ations OKP (All-Union Product Classification Code) 08 3400 GOST 6008-90 (CMEA Standard 497-89) Term from 01.07.91 till 01.07.96 This Standard applies to metallic manganese and nitrided metallic manganese used for the alloying of special purpose steels and alloys as well as in chemical industry. The
3、terms of this Standard are obligatory. 1. TECHNICAL REQUIREMENTS 1.1. Metallic and nitrided manganese shall be produced according to the requirements of this Standard and production schedules approved in accordance with the established procedure. 1.2. Characteristics 1.2.1. The grades and chemical c
4、omposition of metallic manganese and nitrided manganese shall comply with those listed in table 1. Official Edition Standards Publishing House, 1991 This Standard may not be reproduced, in full or in part, reprinted or distributed without the permission of the USSR Gosstandart -,-,- GOST 6008-90 p.
5、2 Table 1 Fraction of the total mass, % CarbonSiliconPhosphorusSulfurGrade Method of productionManganese, no less than No more than Nitrogen, no less than 998 997 Electrolytic 99.8 99.7 0.04 0.06 0.003 0.005 0.03 0.10 96596.50.100.80.060.05 95 Electro- thermal 95.00.201.80.070.05 926Electrolytic nit
6、riding 92.80.100.0050.106.0 87687.00.201.80.070.066.0 89489.00.201.80.070.0154.0 912 Electro- thermal nitriding 91.00.201.80.070.052.0 1.2.2. At the customers request, metallic manganese shall be produced: with a mass fraction of silicon no higher than 0.6 % in grade 965; with a mass fraction of sil
7、icon no higher than 1.3 %, carbon no higher than 0.13 % in grade 95. 1.2.3. The following grades of metallic and nitrided manganese shall be produced: 998 and 997 as lumps (plates) of a cathodic deposit of the same grade. The mass of fines passing through a sieve with mesh size 22 mm shall not excee
8、d 5 % of the batch mass; 965 and 95 as lumps no heavier than 15 kg. The number of lumps heavier than 15 kg shall not exceed 3 % of the batch mass. The mass of fines passing through a sieve with mesh size 1010 mm shall not exceed 10 % of the batch mass; 926 as lumps of cathodic deposit or cakes no he
9、avier than 15 kg. The mass of fines passing through a sieve with mesh size 55 mm shall not exceed 10 % of the batch mass; 876 and 894 as lumps no heavier than 15 kg. The mass of fines passing through a sieve with mesh size 1010 mm shall not exceed 20 % of the batch mass. 1.2.4. The surface of both t
10、he fractures and lumps of metallic and nitrided manganese shall not be polluted with sand, slag, and other foreign materials. Traces of antiburning materials and oxide film are allowed in manganese of grades 965 and 95. -,-,- p. 3 GOST 6008-90 1.2.5. Safety requirements 1.2.5.1. Manganese dust corre
11、sponds to the second hazard class as regards the degree of its effect on humans in accordance with GOST 12.1.007. 1.2.5.2. Manganese is a toxic substance, whose prolonged action causes organic changes of the central nervous system. Inhaling the dust of manganese-containing materials may promote gene
12、ral toxic effect as well as development of a specific form of pneumoconiosis, i.e., manganoconiosis. 1.2.5.3. The maximum allowed concentration of manganese dust in the working zone air is 0.3 mg/m3 (as MnO2) in accordance with GOST 12.1.005. The other hygienic norms for the content of manganese in
13、the environment are listed in the Appendix. 1.2.5.4. The content of manganese in the working zone air shall be monitored on a regular basis in accordance with GOST 12.1.007, using the method approved by the USSR Ministry of Health. 1.2.5.5. The toxicity of the manganese cakes is increased by air and
14、 oxidizing environments, which affect the transformation of manganese into the reactive hexavalent state. The storage of metallic manganese and nitrided manganese shall prevent it from over- oxidation. 1.2.5.6. The lower concentration limit of flame propagation is: 90 g/m3 for metallic manganese; 1
15、000 g/m3 for nitrided manganese. The self-inflammation temperature of aerosol is: 240 C for metallic manganese; 620 C for nitrided manganese. The methods for the determination of fire and explosion danger indicators shall comply with GOST 12.1.044. 1.3. Packing and marking Packing and marking of met
16、allic manganese and nitrided manganese shall comply with GOST 26590 with the following addition: metallic and nitrided manganese shall be packed in wooden boxes, metal barrels, or specialized containers. Delivery of metallic manganese of grades 965 and 95 in bulk is allowed. 2. ACCEPTANCE 2.1. Metal
17、lic manganese and nitrided manganese shall be accepted in batches. A batch shall consist of manganese of the same grade produced in the course of one or several melts. Manganese of grades 998, 997, and 926 shall be accepted in batches consisting of manganese of a single melt. The deviation on the ma
18、ss fraction of manganese in separate batch melts shall not exceed 2.0 % for grade 965 and 2.5 % for grades 95, 876, 894, and 912. A batch shall be accompanied by a quality certificate containing: GOST 6008-90 p. 4 manufacturers brand mark or name and brand mark; grade of metallic or nitrided mangane
19、se; chemical composition; number of the batch; mass of the batch; number of the car; number of freight pieces, their gross and net mass; manufacture date; stamp of the engineering inspection; number of this Standard. 2.2. The sample size for the determination of the chemical composition shall comply
20、 with GOST 26999. 2.3. The sample size for the determination of the maximal lump mass and for checking for the absence of contaminants shall be six pieces taken randomly from a batch. 2.4. The sample size for the determination of the size distribution shall comply with GOST 22310. 2.5. The following
21、 parameters shall be determined in each batch of metallic and nitrided manganese: for grades 998, 997, and 926: mass fractions of manganese, carbon, and sulfur; for grades 965, 95, 876, 894, and 912: mass fraction of manganese, carbon, silicon, and phosphorus; for all grades of nitrided manganese: m
22、ass fraction of nitrogen. 2.6. At the customers request, the following components shall be determined in metallic manganese: in grades 998 and 997, mass fractions of silicon and phosphorus; in grades 876, 894, and 912, mass fraction of sulfur; in grades 965 and 95, mass fractions of sulfur and iron.
23、 2.7. If test results are unsatisfactory even against one of the indicators, a re-test shall be carried out on twice the number of samples taken from the same batch. The results of re- testing shall be assigned to the entire batch. 3. TEST METHODS 3.1. Sampling and sample preparation for the determi
24、nation of the chemical composition shall be carried out in accordance with GOST 26999 or by other methods providing the required sampling accuracy. -,-,- p. 5 GOST 6008-90 3.2. The chemical composition of metallic manganese and nitrided manganese shall be determined in accordance with GOST 28473, GO
25、ST 27069, GOST 27041, GOST 16698.1, GOST 16698.4, GOST 16698.5, GOST 16698.13, or by other methods providing the required determination accuracy. 3.3. Sampling for the determination of size distribution shall be carried out in accordance with GOST 22310 or by other methods providing the required acc
26、uracy of sampling and determination. 3.4. The lump masses shall be determined by weighing. 3.5. The lump surface cleanness shall be estimated visually. 4. TRANSPORTATION AND STORAGE Transportation and storage shall comply with GOST 26590 with the following additions: Metallic manganese and nitrided
27、manganese delivered in bulk and in specialized containers shall be transported by open rolling-stock, while those packed in metal barrels and wooden boxes shall be transported in covered vehicles. By agreement with the customer, packed metallic manganese and nitrided manganese shall be transported b
28、y open rolling-stock. The barrels with metallic manganese and nitrided manganese intended for long-term storage shall be painted brown. -,-,- GOST 6008-90 p. 6 APPENDIX (Reference) Norms of manganese content in environment (maximum allowed concentration) Table 2 Atmospheric air Element or substance
29、Working zone air, mg/m3 One-time maximum, mg/m3 Daily average, mg/m3 Water sources, mg/dm3 Soil, mg per 1 kg Hazard class Manganese0.30.11 5003 Manganese and its compounds; as MnO2 Manganese oxides; as MnO2 0.010.0012 Condensation aerosol0.051 -,-,- p. 7 GOST 6008-90 DETAILS 1. DEVELOPED AND INTRODU
30、CED by the USSR Ministry for Metallurgy DEVELOPERS I.I.Barashkin, N.A.Chirkov, G.B.Krushina 2. APPROVED AND INTRODUCED BY DECREE No. 3150, dated 17.12.90, of the USSR State Committee for Product Quality Management and Standards 3. First review period - 1996. Review frequency - 5 years. 4. In place o
31、f GOST 6008-82 5. This Standard fully complies with CMEA Standard 497-89 6. REFERENCE DOCUMENTATION Number of reference document referred toClause number GOST 12.1.005-881.2.5.3 GOST 12.1.007-761 2.5.1; 1.2.5.4 GOST 12.1.044-89l.2.5.6 GOST 16698.1-713.2 GOST 16698.4-713.2 GOST 16698.5-713.2 GOST 16698.13-843.2 GOST 22310-842.4; 3.3 GOST 26590-851.3; Section 4 GOST 26999-862.2, 3.1 GOST 27041-863.2 GOST 27069-863.2 GOST 28473-903.2 Editor I.V.Vinogradskaya Technical editor V.N.Prusakova Proof-reader V. S. Chyornaya -,-,-