People's Republic of China national standard ferrosilicon GB2272-87

This standard applies to steelmaking and casting as a deoxidizer or alloying element for ferrosilicon.

1 Technical requirements
1.1 Grades and Chemical Composition
1.1.1 Ferrosilicon is based on silicon and its impurity content. Divided into sixteen card arches, their chemical composition shall conform to the provisions of Table 1

Grade Chemical Composition/% Si Al Ca Mn Cr PSC Range â‰¤ FeSi90Al1.5 87.0-95.0 1.5 1.5 0.4 0.2 0.04 0.02 0.2 FeSi90Al3 87.0-95.0 3.0 1.5 0.4 0.2 0.04 0.02 0.2 FeSi75A10.5-A 74.0-80.0 0.5 1.0 0.4 0.3 0.035 0.02 0.1 FeSi75A10.5-B 72.0-80.0 0.5 1.0 0.5 0.5 0.04 0.02 0.2 FeSi75A11.0-A 74.0-80.0 1.0 1.0 0.4 0.3 0.035 0.02 0.1 FeSi75A11.0-B 72.0-80.0 1.0 1.0 0.5 0.5 0.04 0.02 0.2 FeSi75A11.5 -A 74.0-80.0 1.5 1.0 0.4 0.3 0.035 0.02 0.1 FeSi75A11.5-B 72.0-80.0 1.5 1.0 0.5 0.5 0.04 0.02 0.2 FeSi75A12.0-A 74.0-80.0 2.0 1.0 0.4 0.3 0.035 0.02 0.1 FeSi 75A 12.0-B 74.0-80.0 2.0 1.0 0.4 0.3 0.04 0.02 0.1 FeSi75A12.0-C 72.0-80.0 2.0 0.5 0.5 0.04 0.02 0.2 FeSi75-A 74.0-80.0 0.4 0.3 0.035 0.02 0.1 FeSi75-B 74.0-80.0 0.4 0.3 0.04 0.02 0.1 FeSi 75-C 72.0-80.0 0.5 0.5 0.04 0.02 0.2 FeSi65 65.0-<72.0 0.6 0.5 0.04 0.02 FeSi45 40.0-47.0 0.7 0.5 0.04 0.02

1.2 Physical state
1.2.1 ferrosilicon casting thickness: FeSi75 series of various grades of ferrosilicon ingots shall not exceed 100mm; FeSi65 ingots shall not exceed 80mm. Segregation of silicon is not more than 4%.
1,2.2 ferrosilicon supply particle size should be in accordance with the provisions of Table 2.
Table 2 ferrosilicon supply granularity

Level specification/mm Sum of oversize and undersize material/% Normal block without natural broken natural block <20mm Ã— 20mm quantity <8 Large size 50-350 Not more than 10 Medium size 20-200 Not more than 10 Small particle size of 10-100 is not greater than 10 Minimum particle size of 10-50 is not greater than 10

Note: The number of FeSi45 less than 20mm x 20mm must not exceed 15% of the total weight.

1.2.3 The acquirer has special requirements on the granularity of the supply and can negotiate with the supplier
2 test methods
2.1 Sampling The analysis of chemical analysis specimens shall be conducted in accordance with GB 4010-83 (Method for the analysis of ferroalloy chemical analysis specimens).
2.2 Sample Preparation Chemical Analysis Samples were taken using Farah GB 4332-84 Ferroalloy Chemical Analysis Sample Preparation Method.
2.3 Chemical analysis method The chemical analysis method of ferrosilicon is carried out according to GB 4333. l-4333.8-84 "Silicon iron chemical analysis method".
2.4 The particle size test is carried out using square hole steel screen or square hole screen.
3 inspection rules
3.1 Quality Inspection and Acceptance Product quality inspection phase acceptance shall meet the requirements of GB3650-83 "Ferroalloy Acceptance, Packaging, Storage and Transportation, Signage and Quality Certificate General Requirements".
3.2 Batches of ferrosilicon are batched in the same grade, but the fluctuation range of Si content should not exceed 3%.

4 Packaging, storage, transportation, signs and quality certificates
4.1 Packaging ferrosilicon can be shipped in bulk bags, containers, bags, etc. according to the requirements of the buyer. When using bags or containers. There should be obvious signs outside the package.
4.2 Storage, Transportation, Marking and Quality Certificates The storage, transportation, marking and quality certificates of the products produced shall comply with the requirements of GB3650-83 General Requirements for Acceptance, Packaging, Storage, Transportation, Marking and Quality Certificates of Ferrous Alloys.

Additional information;
This standard was proposed by the Ministry of Metallurgical Industry of the People's
This standard is drafted by Shanghai Ferroalloy Factory.
The main drafters of this standard are Chen Zhenhua and Ding Ming.

In this standard, FeSi75Al0.5-A, FeSi75-Al1.0-A, FeSi75Al1.5-A, FeSi75Al2.0-A, FeSi75Al2.0-B, FeSi75-A, and FeSi75-B grades are marked with "Y ". Other grades are marked with "I".

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