This standard specifies the technical requirements, test methods, inspection rules, packaging, storage, transportation, marking and quality certificate of ferrotungsten. This standard applies to ferrotungsten used as a tungsten additive in steelmaking and casting. GB/T 3648-1996 Ferrotungsten GB/T3648-1996 Standard download decompression password: www.bzxz.net

GB/T3648
In order to develop and utilize my country's tungsten ore resources and meet the needs of tungsten iron production and domestic and foreign markets, the original standard (GB33648-87 standard) has been revised as necessary. The FeW80-A grade that has not been ordered for many years in the original standard has been cancelled in the new revised standard. Considering the situation of the source and the actual scope of use, a new grade FeW70 has been added, and the content levels of impurity elements in the original standard (FeW80-B, FeW80-C and FeW75, i.e. FeW80-A, FeW80-B, FeW80-C in the new standard) have been appropriately adjusted to make the grade setting and level of the new standard more reasonable.
This standard was first issued in 1983 and revised for the first time in 1987. From the date of implementation of this standard, 3648-87 This standard is proposed by the Ministry of Metallurgical Industry of the People's Republic of China. Technical Standards Shandong Metallurgical Industry Information Standards Research Institute. Shandong Zhanlin Ferroalloy Factory was responsible for drafting this standard. The main drafters are: Shu Li, Xu Renjie, Li Jing1 Scope
National Standard of the People's Republic of China
Ferrotungsten
GB/T 3648- 1996
Generation GE3618-87
This standard specifies the technical requirements, test methods, inspection rules, packaging, storage, transportation, marking and quality certification of tungsten ferroalloys. This standard is applicable to tungsten ferroalloys used as tungsten element additives in steelmaking and casting. 2 Referenced standards
The following standards contain provisions that constitute the provisions of this standard through reference in this standard. At the time of publication, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest version of the following standards. GB3650-83 General provisions for acceptance, packaging, storage, transportation, marking and quality certification of ferroalloys GB/T4010-94 Collection and preparation of samples for chemical analysis of ferroalloys GB7731.1-87 New method for chemical analysis of ferroalloys Determination of calcium content by cinchonine gravimetric method GB 7731.2-87 Chemical analysis of ferrotungsten by sodium argonate photometric method Determination of manganese
GB 7731.3--87 Chemical analysis methods for tungsten: Determination of copper content by dicyclopentadienyl oxalool; Determination of tungsten content by aluminum blue spectrophotometry; GB7731.4--87 Chemical analysis methods for tungsten: Determination of silicon content by molybdenum sulfide spectrophotometry; GB 7731.5-87 GB 7731.687 GB 7731.787 GB 7731.8-37 GB 773I. 987
Methods for chemical analysis of iron: determination of arsenic content by photometric method; Chemical analysis of tungsten iron: determination of arsenic content by phenylfluorone photometric method; determination of tin content by rosinase B photometric method; Chemical analysis of tungsten iron: determination of tin content by iodide photometric method; Chemical analysis of tungsten iron: determination of arsenic content by iodide photometric method; Chemical analysis of tungsten iron: determination of carbon content by infrared absorption method; Chemical analysis of tungsten iron: determination of carbon content by tungsten iron; Chemical analysis of tungsten iron: determination of sulfur content by infrared absorption method; GB7731.12—88 Methods for chemical analysis of tungsten iron: determination of sulfur content by tungsten iron neutralization titration method; GB7731.13—88 Methods for chemical analysis of tungsten iron: determination of sulfur content by tungsten iron neutralization titration method; GB 7731, 14—88
GB/T 13247-91
3 Technical requirements
3.1 Grades and chemical composition
Determination of lead tantalum by polar harmonic method
Chemical analysis method for ferrotungsten
Sampling and testing method for particle size of ferroalloy products 3.1.1 Ferroalloy is divided into four grades according to the content of tungsten and orthoclase. The chemical composition shall comply with the requirements of Table 1. Approved by the State Bureau of Technical Supervision on September 27, 1996, and implemented on March 1, 1997
FewQ-A
Few&i-B
FeWRO-C
75.0~85, 0)
75.1~5..0
75.0~-85.0
GB/T 3648—1996
Table 1 Chemical composition of pigeon iron
0.801 0.06.
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3.1.2 The required elements of tungsten iron are W, C, P, S. Si, and Mn, and the rest are guaranteed elements. 3.1.3 The tungsten content of tungsten iron is 70% as the reference content. 3.1.4 If the purchaser has special requirements for the elements listed in the table, the supply and demand parties shall negotiate separately: 3.1.5 When the purchaser requires, the actual data of other elements outside the table can be negotiated. 3.2 Physical state
3.2.1 Tungsten iron is delivered in block form. The particle size range is 10mm~130m. The amount of particles less than 10mm×10mm should not exceed 3% of the total weight of the batch. The particle size test shall be carried out according to GB/T:13247. 3.2.2 If the purchaser has special requirements for the product particle size, it can be negotiated by the supply and demand parties. 3.3 Appearance quality
The surface of tungsten iron block should be smooth. There is no significant non-metallic inclusion in the cross section and surface. 4 Test method
4.1 Sampling and sample preparation
The sampling and preparation of samples for chemical analysis shall be carried out in accordance with GB/T4010. 4.2 Chemical analysis
The chemical analysis of tungsten iron shall be carried out in accordance with GR7731.1~7731.14. 5 Inspection rules
5.1 The quality inspection and acceptance of products shall comply with the provisions of GR3650. 5.2 Batch
Tungsten iron shall be delivered in batches of lamps or graded batches. When delivered in batches of furnaces, the difference between the highest or lowest tungsten content in each batch of products and the average tungsten content of the sample shall not exceed 3. When delivering by graded batches, the difference in tungsten content between furnaces shall not exceed 3. 6 Packaging, storage, transportation, marking and quality certificate 6.1 Packaging
6.1.1 The product adopts iron auxiliary packaging. The net weight of each barrel is 100kg. 6.1.2 If the buyer has special requirements for packaging, it can be agreed upon by the supply and demand parties. 6.2 Storage
The product should be stored in a standard room. When shipped, it should be shipped in a covered car. If it is stored in an open air or shipped by car, it must be covered with a tarpaulin to prevent the packaging from being infiltrated or mixed with foreign objects.
6.3 Marking
GB/T 3648-1996
The product packaging 1 should be painted with obvious markings. The packaging should be attached with a finished product label. The content of the marking and label should comply with the regulations of (GB365). 6.4 Quality certificate
The supplier should issue a product quality certificate at the same time as the shipment. The content of the certificate should comply with the regulations of (GB3650).
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