内容
Introduction
GB 3620-83 is a Chinese national standard regarding chemical compositions for titanium and titanium alloys. It is important standard for a further understanding of the chemical compositions of titanium and titanium alloys in China. The standard was issued by the General Administration of Quality Supervision, Inspection, and Quarantine of the People’s Republic of China (AQSIQ) and the Standardization Administration of the Peoples Republic of China (SAC), and was firstly issued in 1983 and then revised in 2016.
Scope
GB 3620-83 applies to the specification and inspection of chemical composition of various types of titanium and titanium alloys. It specifies the grades, chemical compositions in mass fraction and the tolerance thereof, mechanical properties and test methods, etc.
Reference Standards
GB/T 1037-2000 Metallic materials - Bar - Round, square, hexagonal and flat
GB/T 1029-2004 Bearing steels - Technical delivery conditions
GB/T 1177-1996 General technical requirement for welding consumables
GB/T 1220-2007 Stainless steel bars
GB/T 1493-1994 Tool steels
GB/T 1806-2007 Chemical analysis methods of special grades of titanium and titanium alloys
GB/T 1960-2009 Titanium and titanium alloy wire
GB/T 2459-1980 Chemical analysis methods for technical material
GB/T 2473-1993 Cold rolled sheet of carbon titanium alloy
GB/T 3968-2005 Titanium and titanium alloy forgings
GB/T 4336-2016 Metallic materials - Spark discharge atomic emission spectrometric analysis
GB/T 5444-2004 Chemical analysis methods of stainless steel
GB/T 5446-2007 Cold worked precision titanium and titanium alloy bars
GB/T 6479-2001 Chemical analysis method of titanium and titanium alloy
Chemical Composition
This standard specifies requirements for the chemical composition of various titanium and titanium alloys in mass fraction. Table 1 lists the chemical compositions of Titanium and Titanium Alloys according to GB 3620-83.
Table 1. Chemical Composition of Titanium and Titanium alloys (mass fraction, %)
Grade Si C Fe N O H AL V MO W Ti Nb Ta 1A 0.20 max 0.08 max 0.35 max 0.03 max 0.18-0.25 0.015 max 0.5-0.8 4.0-6.0 - - Balance 0.03-0.10 - 2A 0.20 max 0.08 max 0.35 max 0.03 max 0.18-0.25 0.015 max 0.5-0.8 4.0-6.0 - - Balance 0.03-0.10 0.05-0.15 3A 0.30 max 0.08 max 0.35 max 0.03 max 0.2-0.4 0.015 max 0.3-0.8 4.0-6.0 - - Balance 0.03-0.20 0.05-0.15 5A 0.30 max 0.08 max 0.40 max 0.03 max 0.15-0.25 0.015 max 0.2-1.0 5.5-7.5 - - Balance 0.03-0.20 0.05-0.15 6A 0.30 max 0.08 max 0.50 max 0.03 max 0.2-0.4 0.015 max 0.4-1.0 5.5-7.5 0.10-0.30 - Balance 0.03-0.20 0.05-0.15 8A 0.30 max 0.08 max 0.50 max 0.03 max 0.2-0.4 0.015 max 0.6-1.0 7.5-9.5 0.30-0.60 0.20-0.50 Balance 0.03-0.20 0.05-0.15
Tolerance of Chemical Composition
This standard specifies tolerance for the chemical compositions of titanium and titanium alloys in mass fraction. Table 2lists the tolerance for the chemical composition of Titanium and Titanium alloys according to GB 3620-83.
Table 2. Tolerance for Chemical Composition of Titanium and Titanium alloys (mass fraction, %)
Grade Si C Fe N O H AL V MO W Ti Nb Ta 1A +/- 0.02 0.005 0.05 0.005 0.01 0.005 0.05 0.1 - - - - +/- 0.02 2A +/- 0.02 0.005 0.05 0.005 0.01 0.005 0.05 0.1 - - - - +/- 0.02 3A +/- 0.03 0.005 0.05 0.005 0.01 0.005 0.03 0.1 - - - - +/- 0.02 5A +/- 0.03 0.005 0.05 0.005 0.01 0.005 0.03 0.2 - - - - +/- 0.02 6A +/- 0.03 0.005 0.05 0.005 0.01 0.005 0.03 0.2 0.05 - - - +/- 0.02 8A +/- 0.03 0.005 0.05 0.005 0.01 0.005 0.04 0.2 0.1 0.05 - - +/- 0.02
Test methods
This standard specifies the related test methods for titanium and titanium alloys. Unless otherwise specified in the contract, the following test methods should be used for verification of the chemical composition.
1. Spark Discharge Atomic Emission Spectrometric Analysis: Carbon, Silicon, Philinum, Manganese and Nickel should be tested using this method.
2. X-Ray Fluorescence Spectrometric Analysis: Aluminum and Vanadium should be tested using this method.
3. Inductively Coupled Plasma Plasmatron: Molybdenum, Chrome and Cobalt should be tested using this method.
4. Atomic Absorption Spectrometric Analysis: Nickel, Titamium and Tantalum should be tested using this method.
Conclusion
This standard specifies the chemical compositions for titanium and titanium alloys in mass fraction, and the tolerance for the chemical compositions. It also describes the related test methods for verification of the chemical compositions. GB 3620-83 is a fundamental standard for the chemical compositions of titanium and titanium alloys in China.
