Ferroalloys sampling and preparation of samples for chemical analysis
1 Scope
This standard specifies the methods for ferroalloys sampling and preparation of samples for chemical analysis and the relevant precision requirements.
This standard is applicable to the production process management as well as the re-inspection and arbitration of ferroalloy products.
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 (including any amendments) applies.
GB/T 13247 Methods for sampling and testing the grain size of ferroalloys products (GB/T 13247-1991, neq ISO 4551: 1987)
GB/T 28369 Ferroalloys - Experimental methods for the evaluation of the quality variation and methods for checking the precision of sampling (GB/T 28369-2012, ISO 7087: 1984, MOD)
GB/T 28371 Ferroalloys - Experimental methods for checking the precision of sample division (GB/T 28371-2012, ISO 7373: 1987, MOD)
GB/T 28372 Ferroalloys - Sampling and preparation of samples - General rules (GB/T 28372-2012, ISO 3713: 1987, MOD)
3 Sampling tools
3.1 Sampling shovel
See Figure 1 for the structure of sampling shovel and Table 1 for the dimension of sampling shovel.
Figure 1 Structure of sampling shovel
Table 1 Dimension of sampling shovel
3.2 Sampling borer
See Figure 2 for the structure of sampling borer.
Material and specification of sampling borer: seamless steel tube;
Outer sleeve: with an outer diameter of 35mm and a wall thickness of 2mm;
Inner sleeve: with an outer diameter of 30mm and a wall thickness of 2mm.
The sampling borer is suitable for sampling the packed units of ferroalloy products with a top size of not greater than 4mm, and the effective length of the sampling borer shall be greater than 80% of the diagonal of the packed unit.
Foreword i
1 Scope
2 Normative references
3 Sampling tools
4 Composition and division of gross sample
5 Sampling and sample preparation of crushable ferroalloys
6 Sampling and sample preparation of non-crushable ferroalloys
7 Sampling and sample preparation of ferrotitanium, ferromolybdenum, ferrotungsten, ferroniobium, ferrovanadium, vanadium-aluminum, rare earth ferrosilicon, rare earth ferrosilicomagnesium, molybdenum oxide and niobium-ferromanganese alloys.
8 Sampling and sample preparation of nitrogen-bearing ferromanganese, nitrogen-bearing manganese metal, nitrogen-bearing ferrosilicomanganese and nitrogen-bearing ferrovanadium
Annex A (Informative) Comparison between this standard and ISO 4552-1: 1987 and ISO 4552-2: 1987 in terms of clause numbers
Annex B (Informative) Technical differences between this standard and ISO 4552-1: 1987, ISO 4552-2:1987 and their reasons
Annex C (Informative) Example of high-strength alloy crusher
