GB/T 4139-2012 in English

《GB/T 4139-2012钒铁》由TC318（全国生铁及铁合金标准化技术委员会）归口，主管部门为中国钢铁工业协会。

Ferrovanadium

1 Scope

This standard specifies the requirements, test methods, inspection rules, packaging, storage, transportation, marking and quality certification of ferrovanadium.

This standard is applicable to ferrovanadium as an additive for vanadium in steel or alloy materials.

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 8704.1 Ferrovanadium - Determination of carbon content - The infrared absorption method and the gasometric method
GB/T 8704.3 Ferrovanadium - Determination of sulfur content - The infrared absorption method and the combustion-neutralization titration method
GB/T 8704.5 Ferrovanadium - Determination of vanadium content - The ammonium ferrous sulfate titrimetric method and the potentiometric titrimetric method
GB/T 8704.6 Ferrovanadium - Determination of silicon content - The sulphuric acid dehydration gravimetric method
GB/T 8704.7 Ferrovanadium - Determination of phosphorus content - The molybdenum blue photometric method
GB/T 8704.8 Ferrovanadium - Determination of aluminium content - The chromazurol S spectrophotometric method and EDTA titrimetric method
GB/T 8704.9 Ferrovanadium - Determination of manganese content - The potassium periodate oxidation photometric method and flame atomic absorption spectrometric method
GB/T 13247 Methods for sampling and testing the grain size of ferroalloys products

3 Requirements

3.1 Grade and chemical composition

3.1.1 Ferrovanadium is divided into 9 grades according to the contents of vanadium and impurities, and the chemical composition shall be as specified in Table 1.

Foreword i
1 Scope
2 Normative references
3 Requirements
4 Test methods
5 Inspection rules
6 Packaging, storage, transportation, marking and quality certification
Annex A (Informative) Comparison between clause numbers in this standard and those in ISO 5451：1980
Annex B (Informative) Technical differences between this standard and ISO 5451: 1980 and their justifications