GB/T 4137-2004 Rare earth ferrosilicon alloy

This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation and storage of rare earth ferrosilicon alloys. This standard is applicable to the production of light rare earth ferrosilicon alloys used as additives and alloying agents in steel and iron. GB/T 4137-2004 Rare Earth Ferrosilicon Alloys GB/T4137-2004 Standard download decompression password: www.bzxz.net

ICS 77.100
National Standard of the People's Republic of China
GB/T4137--2004
Generation of GB/T41371993
Rare tarthferrosilicon
altoy2004-06-09 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration
2004-11-01 Implementation
This standard represents (8:14137-153) the Joint Standardization Administration of China. This standard has the following changes compared with GB/T4137-2004: GB/T4137-2004
--According to the provisions of GP/T17H84 on the numbering method of rare earth products, the numbering method is replaced by the letter number to indicate the assessment index of K:, and the corresponding analysis method is specified in the appendix of this standard. 1532, 10 3. The two grades are no longer two product specifications, A and 1. One is to reduce the content of impurities in the product, T: the particle size specification is used to reduce the weight from 5000kg to 250kg. The third standard is required to be a normative appendix.
The National Development and Reform Commission of China Rare Earth Bureau proposed this standard to be issued by the National Standardization Technology Commission. Six companies who came up with the package! The main drafters of this standard are: Qi Ji Sanli, Tuo Hua Hu Ruifang, Mi Yuhua, Kang Sie Li: This standard is interpreted by the National Rare Earth Technology Commission. This standard represents the legal version of the ban on the development of the environment: GH5T A-H84, GB/T 413?_933.
1 Scope
Rare earth ferrosilicon alloy
GB, T 4137—2004
This standard specifies the requirements, test methods, inspection and acceptance rules, marking, packaging, transportation and storage of rare earth alloys. This standard is applicable to light ferrosilicon alloys produced in the production of alloys, iron additives and alloying agents. 2 Normative references
The following documents are included in this standard through reference: For any referenced document with a date, all subsequent revisions (excluding revised versions) or versions are not applicable to this standard. However, the parties who have reached an agreement based on this standard may reprint these documents. For any undated referenced document, its latest version is applicable. /T3V General provisions for acceptance, packaging, storage, transportation, marking and quality assurance of ferroalloys GB/T 1377 (all parts) New method for chemical analysis of ferroalloys and rare earth magnesium ferroalloys 3 Requirements
3.1 The chemical composition of the product shall comply with the provisions of Table 1 Table 1
Chemical composition K
196:38
10F326
195329
195933
195335
195538
155041
21.4--+ 21.1
24, c~.r, n
27.c~.3F, n
3c.c..33.n
33.c.33. n
36, n~-33, 0
39. 0~-42, 5
3.2 The dosage range of the product is 0-~5m,mm~50mm, 5uum=5Add 10mL of phosphorus acid mixture (A.2.8) to a 10mL flask, add 3mL of sodium dichromate indicator (A.2.0), and use potassium dichromate standard solution (A.2.11) to adjust until the solution turns yellow. Then calculate by formula A.1):
The concentration of the standard solution is in moles per liter (W/L): V: - The volume of the standard solution of potassium dichromate, in moles per liter (mT). - The concentration of the potassium dichromate standard solution, in moles per liter (mo./L) V: - The volume of the potassium dichromate standard solution, in milliliters (ml). A.3 Sample preparation: crush the sample through a 0.125 mT sieve: A.4 Analysis steps: A.4.1 Sample: weigh 0.2000K sample: A.3) A.4.2 Sample (A.4.1) in a 30L-angle flask. Use a 30L-angle flask to mix with potassium dinitrogen (A.2.3). Heat to dissolve and add mL-100% ml. Mix with aldehyde (A.2.5) at a high temperature, add until it can be heated to a high temperature, and cool to 50°C. A.4.3 Dilute with sulfuric acid (A.2.4) to about 1U mL. According to the data, add cmL of urine solution (A.2.6). Add sodium nitrite (A.2.7) drop by drop, shake until the red color disappears, add 1 drop of formic acid indicator (A.2.9), use ether rust standard (A.2.2) to determine the end point when the red color turns to yellow. A.5 Calculation and presentation of analytical results
According to 2 calculation, let the sample (e fraction mC) be:
Mt;.Vx10-
a(Ce) =
——Cool mass of Ce in grams per mole (/rmu): (: ferrous iron iodide titration concentration, in moles per litre (mo.I): V The volume of ferrous iron consumed in the titration solution during titration, in grams per litre (mr):
4.6 The allowable difference in the analytical results between laboratories should not exceed the allowable values ​​listed in Table A. Table 1
3, 36--1. or
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>5. --15. 9e
>jc.c3--2n.to
Percentage difference/%
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