GB/T 3620.1-2016 English PDF (GBT3620.1-2016)

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GB/T 3620.1-2016: Designation and composition of titanium and titanium alloys
GB/T 3620.1-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.50
H 64
Replacing GB/T 3620.1-2007
Designation and composition
of titanium and titanium alloys
ISSUED ON. DECEMBER 30, 2016
IMPLEMENTED ON. NOVEMBER 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Chemical composition ... 5
4 Chemical composition analysis and analysis report ... 6
5 Others ... 7
Annex A (informative) Designation and chemical composition of deleted
titanium and titanium alloys ... 15
Annex B (informative) Correspondence between designations of industrial
pure titanium in Table 2 of this Standard and pure titanium in ASTM
standard system ... 16
Annex C (normative) Naming rules for titanium and titanium alloys ... 17
Annex D (informative) Explanation on the implementation of this Standard
and related standards ... 19
Foreword
This Standard was drafted according to the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 3620.1-2007 “Designation and composition of
titanium and titanium alloys”.
Compared with GB/T 3620.1-2007, the main technical content changes of this
Standard are as follows.
- RESTORE the designation and chemical composition of industrial pure
titanium in GB/T 3620.1-1994;
- Uniformly CHANGE the designation of industrial pure titanium by adding
“G” behind the designation of industrial pure titanium;
- SORT the designations in tables according to the classification of titanium;
- REVISE the editorial errors of TA22-1, TA24, TC15 and TC17 designations;
- REVISE the Si content in TA19;
- ADD a total of 8 newly registered α-type and near-α-type alloy designations,
namely TA29, TA30, TA31, TA32, TA33, TA34, TA35 and TA36;
- ADD A total of 6 newly registered β-type and near-β-type alloy designations,
namely TB12, TB13, TB14, TB15, TB16 and TB17;
- ADD a total of 6 newly registered α-β-type alloy designations, namely TC27,
TC28, TC29, TC30, TC31 and TC32;
- ADD the naming rules for the designation of titanium alloys;
- SPECIFY the requirements for the implementation of designation and
chemical composition of industrial pure titanium.
This Standard is under the jurisdiction of the National Technical Committee on
Non-ferrous Metals of Standardization Administration of China (SAC/TC 243).
Drafting organizations of this Standard. Baoti Group Co., Ltd., Baoji Titanium
Industry Co., Ltd., China Non-ferrous Metal Industry Standard Metrology and
Quality Institute.
Participating drafting organizations of this Standard. Beijing Institute of
Aeronautical Materials, Western Metal Materials Co., Ltd., Aerospace Research
Institute of Materials and Processing Technology, CSIC Luoyang Ship Material
Research Institute, CHALCO Shenyang Nonferrous Metal Processing Co., Ltd.,
Designation and composition
of titanium and titanium alloys
1 Scope
This Standard specifies the designation and chemical composition of titanium
and titanium alloy products.
This Standard applies to various finished and semi-finished products (including
ingots) pressure-processed by titanium and titanium alloys.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 3620.2 Titanium and titanium alloys - Permissible variations of
chemical composition for wrought product analysis
GB/T 4698 (all parts) Methods for chemical analysis of titanium and titanium
alloys
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
3 Chemical composition
3.1 Designation and chemical composition
3.1.1 The designation and chemical composition of titanium and titanium alloy
products shall comply with the specifications of Table 1, Table 2 and Table 3.
Table 1 shows the designation and chemical composition of industrial pure
titanium, α-type and near-α-type titanium and titanium alloys; Table 2 shows the
designation and chemical composition of β-type and near-β-type titanium alloys;
Table 3 shows the designation and chemical composition of α-β-type titanium
alloys.
3.1.2 Boron is added in nominal quantities and the measured data is reported
for reference.
3.1.3 In Table 1, Table 2 and Table 3, when it only specifies the upper limit of Si
element, it shall be controlled as an impurity element.
3.2 Other elements
3.2.1 Other elements refer to trace elements that are inherently present in the
production process of titanium and titanium alloys, not artificially added
elements.
3.2.2 Other elements generally include. Al, V, Sn, Mo, Cr, Mn, Zr, Ni, Cu, Si, Y
(the alloy elements contained in this designation shall be removed). The Y
content is not more than 0.005 %. When users have other special requirements,
they shall be agreed upon between both parties and indicated in the contract.
3.2.3 The supply party may not test other elements when the product is shipped
from the factory. The sampling inspection may be carried out when required by
the user and specified in the contract.
3.3 Allowable deviation of compositions
When the demand party takes samples from products for chemical composition
retest analysis, the allowable deviation of its compositions shall comply with
GB/T 3620.2.
4 Chemical composition analysis and analysis report
4.1 The chemical composition arbitration analysis of titanium and titanium alloy
products shall be carried out according to GB/T 4698, and the routine inspection
may be carried out according to ICP or other approved methods.
4.2 Unless otherwise specified in the product standards, the supply party may
take samples from titanium and titanium alloy ingots (or from the finished
products for hydrogen element) for chemical composition analysis of products.
4.3 The chemical composition of titanium and titanium alloy products is allowed
to have a second analysis, and the results of the second analysis are the basis
for the final decision.
4.4 The analytical values in chemical composition analysis reports shall have
the same number of significant digits as the corresponding limit values of the
corresponding designations in this Standard. The figure behind the significant
digit shall be rounded off according to the rules specified in GB/T 8170.
Annex C
(normative)
Naming rules for titanium and titanium alloys
C.1 Basic rules for naming of designation
C.1.1 Classification
C.1.1.1 The designation of titanium and titanium alloys is divided into three
categories, namely α, α-β and β.
C.1.1.2 The designation of titanium and titanium alloys is classified based on
the results of the molybdenum equivalent calculated from the content of their
nominal composition.
C.1.2 Naming rules
C.1.2.1 The naming of the designation of titanium and titanium alloys shall be
based on the registration system. Before the naming of the designation, the
designation shall be registered, and the name shall be unified.
C.1.2.2 The designation of titanium and titanium alloys is indicated by letters
and numbers.
C.2 Combination method for designation
C.2.1 The first digit...