GB/T 20066-2006 in English

1. Scope
This national standard specifies sampling and preparation of samples for the determination of chemical composition of pig iron, cast iron and steel. These approaches are respectively applicable to liquid state and solid state thereof.
2. Normative references
The clauses in the following files turn into the clauses of this standard by citation. For all the citation files that bear the dates, all the subsequent amendment documents(not including the corrected contents)or the revised edition are not applicable to this standard, yet, all parties that enter into an agreement according to this standard are encouraged to research whether the latest edition of these documents can be used. For all the citation files without a date, its latest edition is applicable to this standard.
GB/T2975 Steel and steel products--Location and preparation of test pieces for mechanical testing (eqvISO377: 1997)
ISO9147 definition and classification of pig iron
3. Definitions
For the purposes of this national standard, the terms and definitions given in the following apply.
3.1 Chemical method of analysis
The analytical procedure of carrying out the chemical treatment on the sample to measure the chemical constitution in the sample
3.2 Physical method of analysis
Analytical procedure that uses the chemical treatment to measure the chemical constitution in the sample, for instance: photoemission spectra methods X fluorescent spectrometry.
3.3 Thermal method of analysis
The analytical procedure of carrying out the heat, burning or fusing treatment on the sample to measure the chemical constitution of the sample

Foreword
1. Scope
2. Normative references
3. Definitions
4 Technical conditions for sampling
4.1 General requirements
4.2 Sample
4.3 Sampling
4.4 Sampling
4.5 Safety Notes
5 Steel-making and molten iron in the pig iron production
5.1 General requirements
5.2 Spoon sample
5.3 Probe sampling
5.4 Preparation of the sample for analysis
6. Liquid iron for steel products
6.1 General requirements
6.2 Spoon sampling
6.3 Probe sampling
6.4 Preparation of sample for analysis
6.5 Sampling preparation of samples for measuring oxygen, nitrogen and hydrogen
7 Liquid steel for steel products
7.1 General requirements
7.2 Spoon sampling
7.3 Probe sampling
7.4 Preparation of sample for analysis
7.5 Sampling and sample preparation of assay sample for measuring oxygen
7.6 Sampling and preparation of samples for measuring hydrogen
8 Pig iron
8.1 General requirements
8.2 Increment
8.3 Preparation of sample for analysis
9 Cast iron products
9.1 General requirements
9.2 Sampling and preparation of samples
10 Steel products
10.1 General requirements
10.2 Taking preliminary samples and sample for analysis from cast products
10.3 taking preliminary samples and sample for analysis from wrought products
10.4 Preparation of sample for analysis
10.5 Lead bearing steel sampling
10.6 Sampling and sample preparation of sample for analysis for measuring oxygen
10.7 Sampling and sample preparation of sample for analysis for measuring hydrogen
Annex A (Informative) Sampling Tube of Liquid Iron and Liquid Steel
A.1 General requirements
A.2 Immersion sampling tube
A.3 Sampling Tube for Fluid Sampling
A.4 Sampling tube for suction sampling
A.5 Deoxidizing system of sampling tube
A.6 Sample quality
Annex B (Informative) Sampling Tube for Measuring the Hydrogen in Liquid Steel
B.1 General requirements
B.2 Immersion sampling tube
B.3 Suction sampling tube