Standard No.:	GB/T 20124-2006
English Name:	Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas
Chinese Name:	钢铁 氮含量的测定 惰性气体熔融热导法(常规方法)
Chinese Classification:	H11    Steel and iron alloy analysis method
Professional Classification:	GB    National Standard
ICS Classification:	77.080.01 77.080.01    Ferrous metals in general 77.080.01
Issued by:	AQSIQ SAC
Issued on:	2006-3-2
Implemented on:	2006-9-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	4500 words
Price(USD):	80.0
Delivery:	via email in 1 business day

1 Scope This standard specifies a thermal conductimetric method after fusion under inert gas for the determination of nitrogen in steel and iron. The method is applicable to nitrogen contents between 0.002% (m/m) and 0.6% (m/m). 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. ISO Guide 31:1981 Contents of Certificates of Reference Materials ISO Guide 35:1989 Certification of Reference Materials –– General and Statistical Principles ISO 385-1:1984 Laboratory Glassware — Burettes — Part 1: General Requirements ISO 648:1977 Laboratory Glassware — One-mark Pipettes ISO 1042:1998 Laboratory Glassware — One-mark Volumetric Flasks ISO 3696:1987 Water for Analytical Laboratory Use — Specification and Test Methods ISO 5725-1:1994 Accuracy (Trueness and Precision) of Measurement Methods and Results — Part 1: General Principles and Definitions ISO 5725-2:1994 Accuracy (Trueness and Precision) of Measurement Methods and Results — Part 2: Basic Method for the Determination of Repeatability and Reproducibility of a Standard Measurement Method ISO 5725-3:1994 Accuracy (Trueness and Precision) of Measurement Methods and Results — Part 3: Intermediate Measures of the Precision of a Standard Measurement Method ISO 10702:1993 Steel and Iron — Determination of Nitrogen Content –– Titrimetric Method after Distillation. ISO 10720:1997 Steel and Iron — Determination of Nitrogen Content — Thermal Conductimetric Method after Fusion in a Current of Inert Gas ISO 14284:1996 Steel and Iron — Sampling and Preparation of Samples for the Determination of Chemical Composition 3 Principle

Foreword II 1 Scope 2 Normative references 3 Principle 4 Reagents and Materials 5 Apparatus 6 Sampling 7 Procedure 8 Expression of Results 9 Test Report Annex A (Informative) Features of Commercial Resistive Electrode Furnaces and Nitrogen Analysers Annex B (Informative) Additional Information on the International Cooperative Tests Annex C (Informative) Graphical Representation of Precision Data