JB/T 7948.2-2017Methods for chemical analysis of welding fluxes - Part 2: Determination of manganese oxide content (English PDF)

1 Foreword

JB/T 7948.2-2017 was issued by Ministry of Industry and Information Technology of the People's Republic of China on 7 November 2017 and has been in force since 1 April 2018.

It replaces the earlier edition JB/T 7948.2-1999.

It is one of 20 parts of the JB/T 7948 series.

2 Scope

This standard is the Chinese machinery industry standard for the determination of manganese oxide in welding fluxes, the second part of the JB/T 7948 chemical analysis methods. It lays down the principle of the determination together with the reagents, the instruments and the sample it requires. The analysis steps, the calculation of the analytical result and the allowable difference are stated as well. The standard is recommended, with the Chinese classification J33 and the international classification 25.160.20. It quotes GB/T 6682, GB/T 12806, GB/T 12808, GB/T 12809 and GB/T 12810. It replaces JB/T 7948.2-1999.

3 Normative references

JB/T 7948.2-2017 cites the following standards, which apply in full or in part through the references made to them in its clauses.

GB/T 6682

GB/T 12806

GB/T 12808

GB/T 12809

GB/T 12810

4 About this standard

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

English translation: about 15 pages

5 Related standards

Other parts of this standard:

JB/T 7948.1-1999 — Methods for chemical analysis of fused welding fluxes - Determination of silicon dioxide content by gravimetric method

JB/T 7948.1-2017 — Part 1: Determination of silicon dioxide content

JB/T 7948.3-1999 — Methods for chemical analysis of fused welding fluxes - Determination of manganese oxide content by permanganate photometric method

JB/T 7948.3-2017 — Part 3: Determination of aluminium oxide content

JB/T 7948.4-1999 — Methods for chemical analysis of fused welding fluxes - EDTA volumetric method for determination of aluminium oxide content

JB/T 7948.4-2017 — Part 4: Determination of iron oxide content

JB/T 7948.5-1999 — Methods for chemical analysis of fused welding fluxes - Determination of iron oxide content by sulfosalicylic acid photometric method

JB/T 7948.5-2017 — Part 5: Determination of calcium fluoride content

JB/T 7948.6-1999 — Methods for chemical analysis of fused welding fluxes - Determination of calcium fluoride content by pyrohydrolysis method

JB/T 7948.6-2017 — Part 6: Determination of phosphorus content

JB/T 7948.7-1999 — Methods for chemical analysis of fused welding fluxes - Determination of calcium fluoride content by lead chlorofluoride-EDTA volumetric method

JB/T 7948.7-2017 — Part 7: Determination of sodium oxide and potassium oxide content

JB/T 7948.8-1999 — Methods for chemical analysis of fused welding fluxes - Determination of phosphorus content by molybdenum blue photometric method

JB/T 7948.8-2017 — Part 8: Determination of carbon and sulfur content

JB/T 7948.9-1999 — Methods for chemical analysis of fused welding fluxes - Determination of sodium oxide and potassium oxide content by flame photometry

JB/T 7948.9-2017 — Part 9: Determination of calcium oxide and magnesium oxide content

JB/T 7948.10-1999 — Methods for chemical analysis of fused welding fluxes - Determination of carbon content by combustion-coulometric method

JB/T 7948.11-1999 — Methods for chemical analysis of fused welding fluxes - Determination of sulfur content by combustion-iodometric method

JB/T 7948.12-1999 — Methods for chemical analysis of fused welding fluxes - Determination of calcium oxide and magnesium oxide content by EDTA volumetric method

Other editions:

JB/T 7948.2-1999 (earlier edition)

6 Classification and status

International classification (ICS): 25.160.20

Prefix JB/T: recommended standard.