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GB/T 14992-2005 English PDF (GBT14992-2005)

GB/T 14992-2005 English PDF (GBT14992-2005)

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GB/T 14992-2005: Classification and designation for superalloys and high temperature intermetallic materials
GB/T 14992-2005
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.01
H 57
Replacing GB/T 14992-1994
Classification and designation for superalloys and
high temperature intermetallic materials
ISSUED ON: JULY 21, 2005
IMPLEMENTED ON: JANUARY 01, 2006
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Classification ... 5 
3 Naming rules and use of designation for superalloys and high temperature
intermetallic materials ... 5 
4 Representation method of designation ... 6 
5 Designations of superalloys and high temperature intermetallic materials and
their chemical composition ... 9 
Foreword
This Standard replaces GB/T 14992-1994 “Types of heat-resisting superalloys”.
As compared with GB/T 14992-1994, the main changes of this Standard are as
follows:
- CHANGE the standard name from “Types of heat-resisting superalloys” to
“Classification and designation for superalloys and high temperature
intermetallic materials”;
- ADD categories of high temperature intermetallic materials, i.e. nickel-
aluminum-based and titanium-aluminum-based high temperature
intermetallic materials; at the same time, ADD the corresponding
designation representation methods;
- ADD categories of superalloys, i.e. directionally solidified columnar crystal
superalloys, single crystal superalloys, and dispersion strengthened
superalloys; at the same time, ADD the corresponding designation
representation methods;
- ADD the classification code for superalloys with chromium as the main
element, i.e. “7” and “8” numbers, and use method;
- ADD the designations of superalloys, from the previous 61 to 177;
- “Naming procedure of designation for superalloys” is changed to: “Naming
rules and use of designation for superalloys and high temperature
intermetallic materials”;
- Delete “Permissible tolerances for chemical composition of deformed
superalloy products”;
- The content of subclause “Measurement of the content of residual elements
and harmful impurity elements” is rewritten: “Control of harmful impurity
elements” is incorporated into 5.1 of this Standard; the residual element
“copper” is mainly specified as the general chemical composition of the
designation.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of China Metallurgical Information
and Standardization Institute.
Drafting organizations of this Standard: Central Iron and Steel Research Institute,
China Metallurgical Information and Standardization Institute.
Main drafters of this Standard: Yuan Ying, Yan Ping, Zhuang Jingyun, Li
Shiqiong, Chen Huixia, Zeng Fan, Feng Di, Zhao Minghan.
This Standard was first issued in December 1982, GBn 175-1982; in 1994, it
was adjusted to GB/T 14992-1994.
Classification and designation for superalloys and
high temperature intermetallic materials
1 Scope
This Standard specifies the classification, naming principles and naming
procedures of designation, and general chemical composition, etc. for
superalloys and high temperature intermetallic materials.
This Standard applies to deformed superalloys, cast superalloys (isometric
crystal cast superalloys, directionally solidified columnar crystal superalloys,
and single crystal superalloys), superalloy wire for welding, powder metallurgy
superalloys, dispersion strengthened superalloys and high temperature
intermetallic materials.
2 Classification
2.1 Superalloy classification
According to the basic forming method or special use of alloys, alloys are
classified into deformed superalloys, cast superalloys (isometric crystal cast
superalloys, directionally solidified columnar crystal superalloys, and single
crystal superalloys), superalloy wire for welding, powder metallurgy superalloys,
and dispersion strengthened superalloys.
2.2 Classification of high temperature intermetallic materials
According to the basic constituent elements of the high temperature materials,
the high temperature materials are classified into nickel-aluminum-based high
temperature intermetallic materials and titanium-aluminum-based high
temperature intermetallic materials.
3 Naming rules and use of designation for superalloys
and high temperature intermetallic materials
3.1 For superalloys and high temperature intermetallic materials which have
been scientifically researched, trial-produced, and formally certified and put into
batch production by the competent authorities, and for alloys or materials which
are officially developed by project approval, produced by the state and are
stable in process and available for supply, the main production and
development organizations shall submit registration applications for material
designation to the standard jurisdiction organization.
3.2 Superalloys and high temperature intermetallic materials in the scientific
research and trial-production stage can be named according to the designation
representation method of this Standard.
3.3 It is allowed to use the new designation in parallel with the previous
designation. In technical documents, new and previous designations can be
listed at the same time.
3.4 The designations of superalloys and high temperature intermetallic
materials are represented by a combination of letters and Arabic numerals.
According to special needs, after the designation, English letters can be added,
to indicate the modified alloy of the previous alloy, such as indicating a specific
process or a specific chemical composition, etc.
The general form of designation of superalloys and high temperature
intermetallic materials is:
4 Representation method of designation
4.1 Designation prefix
The designation of deformed superalloy is prefixed with the Chinese phonetic
alphabet “GH” (“G” and “H” are the first letters of Chinese Pinyin “Gao” and “He”,
respectively);
The designation of isometric crystal cast superalloy is prefixed with the Chinese
phonetic alphabet “K”;
The designation of directionally solidified columnar crystal superalloy is prefixed
with the Chinese phonetic alphabet “DZ” (“D” and “Z” are the first letters of
Chinese Pinyin “Ding” and “Zhu”, respectively);
Suffix, an English letter symbol, which indicates a specific process or specific chemical
composition etc. (special need)
The number (two or three digits) which indicates different designations in the same
material category
The number which indicates the classification code of material
Prefix, a Chinese phonetic alphabet symbol (two or three digits), which indicates the
basic feature category
The designation of single crystal superalloy is prefixed with the Chinese
phonetic alphabet “DD” (“D” and “D” are the first letters of Chinese Pinyin “Ding”
and “Dan”, respectively);
The designation of superalloy wire for welding is prefixed with the Chinese
phonetic alphabet “HGH” (The “H” before the “GH” symbol is the first letter of
the Chinese Pinyin “Han”);
The designation of powder metallurgy superalloy is prefixed with the Chinese
phonetic alphabet “FGH” (The “F” before the “GH” symbol is the first letter of
the Chinese Pinyin “Fen”);
The designation of dispersion strengthened superalloy is prefixed with the
Chinese phonetic alphabet “MGH” (The “M” before the “GH” symbol is the first
letter of the Chin...
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