GB/T 14992-2005 PDF English (GB/T 14992-1994: Older version)

GB/T14992-2005 (GBT14992-2005): PDF in English

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 & 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 Chinese Pinyin “Mi”); The designation of high temperature intermetallic material is prefixed with the Chinese phonetic alphabet “JG” (“J” and “G” are the first letters of Chinese Pinyin “Jin” and “Gao”). 4.2 Arabic numerals 4.2.1 Deformed superalloy and superalloy wire for welding 4.2.1.1 The prefix is followed by four digits. The first digit indicates the alloy’s classification code. The second to the fourth digit indicate the alloy number; the alloy number of the insufficient number of digits is filled with the number “0”. “0” is placed between the first digit indicating the classification code and the alloy number. 4.2.1.2 The choice of odd-even number for classification code is determined according to the strengthening type mainly used for the alloy. The first digit in the designation of superalloy wire for welding has no meaning of strengthening type, only follows the number of designation of deformed superalloy. The classification code, i.e. the first digit, is specified as follows: 1 - indicate a solid solution strengthening type alloy in which iron or iron- nickel (nickel of less than 50%) is a main element; 2 - indicate an ageing strengthening type alloy in which iron or iron-nickel (nickel of less than 50%) is a main element; 3 - indicate a solid solution strengthening type alloy in which nickel is a main element; 4 - indicate an ageing strengthening type alloy in which nickel is a main element; 5 - indicate a solid solution strengthening type alloy in which cobalt is a main element; 6 - indicate an ageing strengthening type alloy in which cobalt is a main element; 7 - indicate a solid solution strengthening type alloy in which chromium is a main element; 8 - indicate an ageing strengthening type alloy in which chromium is a main element. 4.2.2 Other superalloys and high temperature intermetallic materials 4.2.2.1 The prefix of cast superalloy is generally followed by three Arabic numerals. The first digit indicates the alloy’s classification code. The second and third digits indicate the alloy number; the alloy number of the insufficient number of digits is filled with the number “0”. “0” is placed between the first digit indicating the classification code and the alloy number. 4.2.2.2 The prefix of powder metallurgy superalloy, dispersion strengthened superalloy, and high temperature intermetallic material is followed by four Arabic numerals. The Arabic numerals are as specified in 4.2.1.1. 4.2.2.3 The classification code, i.e. the fir.......
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