GB/T 3211-1987 Metallic Chromium GB/T3211-1987 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Metallic chromium
(Chramium melal
UDC 669.26
B 3211-87
Generation G1321182
This standard applies to metallic chromium used as a chromium additive in the refining of high-temperature alloys, resistance alloys, and precision alloys. 1 Technical requirements
1.1 Grades and chemical composition
1.1.1 Metallic chromium is divided into five grades according to the content of chromium and impurities. Its chemical composition shall comply with the provisions of the following table. Chemical
JCr99...A
JCr99B
JCr98.5-—A
JCr98.5-B
FesiACuCsP
Not less than
99. 0 0. 350.
scientific composition,Www.bzxZ.net
not much lower
30*.0.020,02
99.0b.40k0.300.30.040.020.020.0298.5 p. 450.350.500.040.030.020.0198.5b. 50o.4qo. 500.n60.05o.020. 0198. 0 n. 8d o. 4b. gr. o6k0. 050. c30.on0.000 5
0.010.0010,0010.007
0. 0010. 00110. 0010. 001
10. c010. 0010. 0010. 0c1
0.001j0. 0010.001:0.05
0.00r.t01'0.00c.001
1.1.2 If the buyer has special requirements for individual elements of the chemical composition, it is necessary to negotiate with the supplier: 1.2 Physical state
1.2.1 Metal chromium should be delivered in block form. The largest block should pass through the 15×150mm sieve. The block passing through the 10×10mm sieve should not exceed 10% of the total amount of the batch. The undersize of the 3×3mm sieve should not be delivered. 1.2.2 If the buyer has special requirements for block size, it can be negotiated with the supplier. 1 Appearance quality
The surface of the metal chromium should be finished to show the original color of chromium, and the cross section should be Dense and free of pores. 2 Test methods
2.1 Sampling
The sampling of samples for chemical analysis shall be carried out in accordance with GB4010-83 "Method for sampling samples for chemical analysis of ferroalloys". 2.2 Preparation
The preparation of samples for chemical analysis shall be carried out in accordance with GB4332-84 "Method for preparing samples for chemical analysis of ferroalloys". 2.3 Chemical analysis
The chemical analysis method shall be carried out in accordance with GB4702 "Method for chemical analysis of metallic chromium". 3 Inspection rules
3.1 The quality inspection and acceptance of products shall comply with the requirements of GB3650-85 "General provisions for acceptance, packaging, marking and quality certificate of ferroalloys".
Approved by the Ministry of Metallurgical Industry of the People's Republic of China on July 23, 1987, and implemented on July 1, 1988
GB 3211-87
The remaining chromium is delivered as one batch in one furnace. The remaining quantity that is less than one package can be combined with the products of the same brand. Packaging, marking, storage and transportation and quality certificate 4
4.1 Packaging
The product is packed in iron drums with a net weight of 50kg or 110kg each. A.2 Storage and transportation. Marking and quality certificate
The storage and transportation, marking and quality certificate of the product shall comply with the requirements of G13 365083.
Additional remarks:
This standard was proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard was drafted by Aluminum State Iron and Steel Factory. The main drafters of this standard are Huang Bingjie, Guan Zhuhua and Zhao Zhiche. In this standard, the standard level grades of the three brands JCr99-A, JCr99-B and JCr98.5-A are marked as \Y\. The standard level grades of other brands in the wood standard are marked as "1\
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