Ferromanganese
1 Scope
This standard specifies the classification, technical requirements, test methods, inspection rules, packing, storing, transportation, marking and certification for ferromanganese products.
This standard is applicable to ferromanganese as deoxidizer and alloy element additive for steelmaking and casting.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 3650 The general rules for inspection, packing, storing, transportation, marking and certification of ferroalloy
GB/T 4010 Ferroallys sampling and preparation of samples for chemical analysis
GB/T 5686.1 Ferromanganese, ferromanganese-silicon, nitrogen-bearing ferromanganese and manganese metal - Determination of manganese content - Potentiometric method, titrimetric method after ammonium nitrate oxidation and titrimetric method after perchloric acid oxidatio
GB/T 5686.2 Ferromanganese, ferromanganese-silicon, nitrogen-bearing ferromanganese and manganese metal - Determination of silicon content - Molybdenum blue photometric method, silicon potassium fluoride titrimetric method and perchloric acid dehydration gravimetric method
GB/T 5686.4 Ferromanganese, ferromanganese-silicon, nitrogen-bearing ferromanganese and manganese metal - Determination of phosphorus content - Molybdenum blue photometric method and alkali content titrimetric method
GB/T 5686.5 Ferromanganese, ferromanganese-silicon, nitrogen-bearing ferromanganese and manganese metal - Determination of carbon content - The infrared absorption method, the gasometric method, the gravimetric and the coulometric method
GB/T 5686.7 Ferromanganese, ferromanganese-silicon, nitrogen-bearing ferromanganese and manganese metal - Determination of sulfur content - Infrared absorption method and combustion-neutralization method
GB/T 7738 Notations for designation of ferralloys
GB/T 13247 Methods for sampling and testing the grain size of ferroalloys products
3 Product classification
3.1 According to smelting methods, the product can be divided into ferromanganese produced by electric furnace and those produced by blast furnace.
3.2 According to carbon content, the product can be divided into four categories:
——Extra low carbon type: with carbon content not more than 0.15%;
——Low carbon type: with carbon content more than 0.15% and less than 0.7%;
——Medium carbon type: with carbon content more than 0.7% and less than 2.0%;
——High carbon type: with carbon content more than 2.0% and less than 8.0%.
3.3 According to content of silicon and phosphorus, the product can be divided into two groups, i.e., I and II.
Foreword i
1 Scope
2 Normative references
3 Product classification
4 Designation expression
5 Technical requirements
6 Test methods
7 Inspection rules
8 Packing, storing, transportation, marking and certification
