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GB/T 3620.2-2023 English PDF (GBT3620.2-2023)

GB/T 3620.2-2023 English PDF (GBT3620.2-2023)

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GB/T 3620.2-2023: Titanium and titanium alloy permissible variations of chemical composition for wrought product analysis

This document specifies the permissible variations of chemical composition for titanium and titanium alloy wrought product (plates, strips, foils, pipes, bars, wires, forgings, profiles and castings). This document is applicable to the demand-side????s check analysis and arbitration analysis of the chemical composition of the product.
GB/T 3620.2-2023
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.120.50
CCS H 64
Replacing GB/T 3620.2-2007
Titanium and Titanium Alloy Permissible Variations of
Chemical Composition for Wrought Product Analysis
ISSUED ON: AUGUST 6, 2023
IMPLEMENTED ON: MARCH 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Technical Requirements ... 5
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents. This document serves as a replacement of GB/T 3620.2-2007 Titanium and Titanium Alloys - Permissible Variations of Chemical Composition for Wrought Product Analysis. In comparison with GB/T 3620.2-2007, apart from structural adjustments and editorial modifications, the main technical changes are as follows:
a) The content of the Scope is modified (see Chapter 1; Chapter 1 of Version 2007); b) The general principles of sampling are deleted (see 4.1 of Version 2007); c) The description of the applicability of the permissible variations of chemical composition is added (see 4.1.2);
d) The permissible variations of the element W are added (see 4.1.3);
e) The permissible variations of the elements O, Al, Cr, Mo, Mn, Cu, B, Zr and Y are modified (see 4.1.3; 4.4.3 of Version 2007);
f) The requirements for sampling locations are modified (see 4.2; 4.2 of Version 2007); g) The analysis method YS/T 1262 for chemical composition is added (see 4.3). Please be noted that certain content of this document may involve patents. The institution issuing this document does not undertake the responsibility of identifying these patents. This document was proposed by China Non-ferrous Metals Industry Association. This document shall be under the jurisdiction of National Technical Committee on Nonferrous Metals of Standardization Administration of China (SAC/TC 243).
The drafting organizations of this document: Baoji Titanium Industry Co., Ltd.; Baotai Group Co., Ltd.; China Nonferrous Metals Techno-Economic Research Institute Co., Ltd.; Xinjiang Xiangrun New Material Technology Co., Ltd.; CHINALCO Shenyang Nonferrous Metal Processing Co., Ltd.; Hunan Xiangtou Goldsky New Materials Co., Ltd.; Baowu Special Metallurgical Co., Ltd.; Baoji Top Titanium Industry Co., Ltd.; Youyan Engineering Technology Research Institute Co., Ltd.
The main drafters of this document: Bai Huanhuan, Ma Zhongxian, Xie Chen, Bai Zhuihui, Zhang Jiangfeng, Qing Daga, Ma Jiakun, Yang Rong, Ye Hongchuan, Liu Jiatao, Li Junzhao, Li Xiaodong, Li Baoxia, Yu Yang, Feng Junning, Feng Yongqi, Gao Qi.
This document was firstly issued in 1983, firstly revised in 1994 and secondly revised in 2007. This is the third revision.
Titanium and Titanium Alloy Permissible Variations of
Chemical Composition for Wrought Product Analysis
1 Scope
This document specifies the permissible variations of chemical composition for titanium and titanium alloy wrought product (plates, strips, foils, pipes, bars, wires, forgings, profiles and castings).
This document is applicable to the demand-side?€?s check analysis and arbitration analysis of the chemical composition of the product.
This document does not apply to the supply-side?€?s analysis of the chemical composition of the product, nor does it apply to the check analysis of changes in the content of impurity elements (such as: hydrogen, nitrogen and oxygen) caused by the demand-side?€?s reprocessing of the product.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 4698 (all parts) Methods for Chemical Analysis of Titanium Sponge, Titanium and Titanium Alloys
GB/T 31981 Methods of Sampling and Sample Preparation for Chemical Composition Analysis of Titanium and Titanium Alloy
YS/T 1262 Method for Chemical Analysis of Titanium Sponge, Titanium and Titanium Alloys - Determination of Multielement Content - Inductively Coupled Plasma Atomic Emission Spectrometry
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 check analysis
Chemical composition analysis conducted by the demand-side by taking samples from the processed products.
3.2 permissible variation of chemical composition
The allowable difference between the actual measured value of the check analysis of chemical composition and the limit value specified in the product standard.
4 Technical Requirements
4.1 Permissible Variation of Chemical Composition
4.1.1 Unless otherwise specified in the product standard or order sheet, the permissible variation of chemical composition of titanium and titanium alloy wrought products shall comply with the stipulations of Table 1.
4.1.2 The value obtained from the check analysis or arbitration analysis shall not exceed the upper limit of the chemical composition limit values specified in the product standard plus a positive deviation, nor shall it exceed the lower limit of the chemical composition limit values specified in the product standard plus a negative deviation. For the same element, only unidirectional deviation is allowed, and positive and negative deviations shall not occur at the same time.
NOTE: the product standard stipulates that the aluminum content of the chemical composition of TC4 titanium alloy is 5.50% ~ 6.75%, and the chemical composition limit values specified by the product standard are: the upper limit is 6.75% and the lower limit is 5.50%. During the check analysis of chemical composition, if the analytical value of aluminum content is 7.15%, and its content exceeds the upper limit specified in the product standard by 0.40%, in accordance with the permissible variations of chemical composition in this document, the aluminum content in TC4 titanium alloy does not exceed the upper limit (6.75%) + positive deviation (+0.40%), then, the aluminum content of TC4 titanium alloy is qualified; if the analytical value of aluminum content is 5.10%, and its content exceeds the lower limit specified in the product standard by 0.40%, in accordance with the permissible variations of chemical composition in this document, the aluminum content in TC4 titanium alloy does not exceed the lower limit (5.50%) + negative deviation (?€?0.40%), then, the aluminum content of TC4 titanium alloy is qualified.
4.1.3 For elements not listed in Table 1, the permissible variations of the chemical composition shall be determined between the demand-side and the supply-side through negotiation.

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