GB/T 4699.4-2008 English PDF

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GB/T 4699.4-2008: Ferrochromium and silicon chromium -- Determination of carbon content -- Infrared absorption method and gravimetric method
Status: Valid

GB/T 4699.4: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4699.4-2008	229	Add to Cart	3 days	Ferrochromium and silicon chromium -- Determination of carbon content -- Infrared absorption method and gravimetric method	Valid
GB/T 4699.4-1988	199	Add to Cart	2 days	Methods for chemical analysis of silicochromium The infrared absorption method for the determination of carbon content	Obsolete

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Basic data

Standard ID: GB/T 4699.4-2008 (GB/T4699.4-2008)
Description (Translated English): Ferrochromium and silicon chromium -- Determination of carbon content -- Infrared absorption method and gravimetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H11
Classification of International Standard: 77.100
Word Count Estimation: 10,158
Date of Issue: 2008-05-13
Date of Implementation: 2008-11-01
Older Standard (superseded by this standard): GB/T 4699.4-1988; GB/T 5687.5-1988; GB/T 5687.7-1988
Quoted Standard: GB/T 4010
Regulation (derived from): National Standard Approval Announcement 2008 No.8 (Total No.121)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the determination of ferrochrome infrared absorption method and gravimetric method, content of carbon in silicon -chromium alloy. The infrared absorption method in this section applies to chromium iron, determination of the carbon content of silicon -chromium alloys. Measuring range: 0. 010 % ~ 10. 50%, gravimetric method for the determination of the carbon content of ferrochrome. Measuring range (mass fraction): 4. 00 %-10. 50%.

GB/T 4699.4-2008: Ferrochromium and silicon chromium -- Determination of carbon content -- Infrared absorption method and gravimetric method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Ferrochromium and silicochromium. Determination of carbon content. Infrared absorption method and gravimetric method ICS 77.100 H11 National Standards of People's Republic of China Replacing GB/T 4699.4-1988, GB/T 5687.5-1988, GB/T 5687.7-1988 Determination of ferrochrome and chrome silicon carbon content Infrared absorption method and gravimetric method Posted 2008-05-13 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This part is GB/T 5687.5-1988 "Methods for chemical analysis of ferrochromium The infrared absorption method for the determination of carbon content", GB/T 5687.7- 1988 "The gravimetric method for chemical analysis of ferrochromium determination of carbon content", GB/T 4699.4-1988 "silicon alloy chemical analysis method of infrared absorption Determination of carbon content close "integration amendment. This Part replaces GB/T 5687.5-1988, GB/T 5687.7-1988, GB/T 4699.4-1988. This portion of the GB/T 5687.5-1988, GB/T 5687.7-1988 and GB/T 4699.4-1988 compared, mainly for the The following modifications. --- Infrared absorption method for determination of the detection limit carbon ferrochrome from 0.025% to 0.010% modification; --- Infrared absorption method for the determination of carbon content in ferrochromium by the allowable difference "is 0.025% 0.003%" to "0.010% ~ 0.025% 0.003% when. " This part is proposed by the China Iron and Steel Association. This section is under the jurisdiction of Metallurgical Industry Information Standards Institute. This section is drafted. Sinosteel Jilin Ferroalloy Co., Ltd. The main drafters of this section. Yang Fan, Bi Jun, in Guiping. This part of the standard replaces the previous editions are. --- GB/T 5687.5-1988; --- GB/T 5687.7-1988; --- GB/T 4699.4-1988. Determination of ferrochrome and chrome silicon carbon content Infrared absorption method and gravimetric method Warning. Use of this section shall be a person experiences regular laboratory work. This section does not point out all possible security asked question. Users have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.

1 Scope

This section specifies the determination of chromium iron, chromium silicon alloy carbon content by infrared absorption method and gravimetric method. The infrared absorption method in this section applies to chromium iron, chromium alloy in the determination of silicon carbon content measurement range (mass fraction). 0.010% 10.50%; gravimetric method for the determination of carbon ferrochrome content measurement range (mass fraction). 4.00% - 10.50%.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 4010 alloy chemical analysis and preparation of samples

3 a method of infrared absorption method

3.1 Principle The sample is heated in a high frequency induction furnace combustion flow of oxygen, carbon dioxide generated by the oxygen contained in the measuring chamber to the infrared analyzer dioxide Carbon absorption in a specific wavelength of infrared energy absorbed is proportional to its concentration can, according to the detector to accept the change in energy measured the amount of carbon. 3.2 Reagents and materials 3.2.1 acetone, the residue after evaporation, the carbon content is less than 0.0005%. 3.2.2 Magnesium perchlorate anhydrous particles. 3.2.3 asbestos caustic soda, granular. 3.2.4 glass wool. 3.2.5 tungsten particles, the amount of carbon is less than 0.002%, particle size of 0.8mm ~ 1.4mm. 3.2.6 tin particles, carbon content less than 0.002%, particle size 0.4mm ~ 0.8mm. If necessary, apply acetone (3.2.1) clean the surface and in the room Warm and dry. 3.2.7 pure iron, carbon content less than 0.002%. 3.2.8 When oxygen purity of more than 99.95%, if other levels of oxygen to obtain a low and consistent blank, can also be used. 3.2.9 power source gas, nitrogen or compressed air, which contaminants (oil and water) content of less than 0.5%. 3.2.10 ceramic crucible diameter × height, 23mm × 23mm or 25mm × 25mm, and at more than 1200 ℃ high temperature furnace burning 4h or burned in oxygen burning to blank the lowest value. 3.2.11 crucible tongs. 3.3 instruments and equipment 3.3.1 Dingtan infrared absorption instrument (sensitivity of 1.0 × 10-6) Its apparatus shown in Figure 1. ......

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