GB/T 15062-2025 Wrought superalloy—Seamless tube English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS 77.140
CCS H 57
National Standard of the People's Republic of China
GB/T 15062-2025
Replaces GB/T 15062-2008, GB/T 28295-2012
Wrought superalloy - Seamless tube
变形高温合金 无缝管
Issue date: 2025-08-29 Implementation date: 2026-03-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Ordering information
5 Manufacturing process
6 Technical requirements
7 Test methods
8 Inspection rules
9 Packaging, marking, and quality certificate
Wrought superalloy-Seamless tube
1 Scope
This document specifies ordering information, manufacturing process, technical requirements, inspection rules, packaging, marking, and quality certificate for wrought superalloy seamless tubes, and describes corresponding test methods.
This document applies to wrought superalloy seamless tubes (hereinafter referred to as tubes) produced by cold-drawing (rolling) processes.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies; for undated references, the latest edition (including any amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel and alloy products
GB/T 223 (All parts) Chemical analysis methods for iron and steel
GB/T 228.1 Metallic materials-Tensile testing-Part 1: Method of test at room temperature
GB/T 228.2 Metallic materials-Tensile testing-Part 2: Method of test at elevated temperature
GB/T 230.1 Metallic materials-Rockwell hardness test-Part 1: Test method
GB/T 231.1 Metallic materials-Brinell hardness test-Part 1: Test method
GB/T 241 Metallic tubes-Hydrostatic test method
GB/T 242 Metallic tubes-Flaring test method
GB/T 246 Metallic materials-Tubes-Flattening test method
GB/T 2039 Metallic materials-Uniaxial creep test in tension
GB/T 2102 Acceptance, packaging, marking, and quality certificate for steel tubes
GB/T 2975 Steel and steel products-Sampling location and preparation of test pieces for mechanical testing
GB/T 4340.1 Metallic materials-Vickers hardness test-Part 1: Test method
GB/T 5777 Automatic ultrasonic testing for longitudinal and/or transverse flaws in seamless and welded (except submerged-arc welded) steel tubes over full circumference
GB/T 6394 Standard test method for determining average grain size
GB/T 7735 Automatic eddy current testing for flaws in seamless and welded (except submerged-arc welded) steel tubes
GB/T 11170 Stainless steel-Determination of multi-element content-Spark discharge atomic emission spectrometry (conventional method)
GB/T 13298 Metallographic examination methods
GB/T 14992 Designations and chemical compositions of superalloys and intermetallic compounds
GB/T 20066 Sampling and sample preparation for determination of chemical composition of steel and iron
GB/T 20123 Iron and steel-Determination of total carbon and sulfur content-Infrared absorption method after combustion in a high-frequency furnace (conventional method)
GB/T 20124 Iron and steel-Determination of nitrogen content-Inert gas fusion thermal conductivity method (conventional method)
GB/T 20127 (All parts) Iron and steel-Determination of trace elements
GB/T 30062 Steel tube terminology
GB/T 38939 Nickel-based alloys-Determination of multi-element content-Spark discharge atomic emission spectrometry (conventional method)
HB 5220 (All parts) Chemical analysis methods for superalloys
HB 20241 (All parts) Spectrochemical analysis methods for superalloy chemical composition
3 Terms and definitions
Terms and definitions defined in GB/T 14992 and GB/T 30062 apply to this document.
4 Ordering information
When ordering according to this document, the contract should include the following information:
a)Standard number;
b)b) Alloy designation;
c)c) Melting method;
d)d) Delivery condition;
e)e) Dimensions and tolerance class;
f)f) Cut-to-length or multiple-length (if required);
g)g) Weight or piece count;
h)h) Ultrasonic testing acceptance level;
i)i) Other special requirements.
5 Manufacturing Process
5.1 Melting Method of Alloy
The melting method of the alloy shall comply with Table 1. Upon mutual agreement between the supplier and purchaser, other melting methods may be used provided they meet all requirements of this specification. The melting method adopted shall be specified in the contract and quality certificate.
Table 1 Melting Methods for Alloys
5.2 Manufacturing Method for Tubes
Tubes shall be manufactured using hot extrusion followed by cold drawing (or rolling) or hot piercing followed by cold drawing (or rolling).
5.3 Delivery Condition
5.3.1
Tubes shall be delivered in solution-treated and pickled or solution-treated under protective atmosphere. Upon mutual agreement between the supplier and purchaser, and as specified in the contract, they may also be delivered in cold-drawn or cold-rolled condition.
5.3.2
Recommended solution heat treatment parameters are provided in Table 2.
Table 2 Recommended Solution Heat Treatment Parameters
6 Technical Requirements
6.1 Designation and Chemical Composition
6.1.1 The chemical composition (as-melted analysis) of the alloy shall comply with Table 3.
6.1.2The allowable deviation of finished product chemical composition for tubes shall comply with GB/T 222.
6.2 Mechanical Properties
6.2.1 The room-temperature tensile properties of tubes shall comply with Table 4.
6.3 Delivery Hardness
6.3.1 The surface Rockwell hardness of GH3625 tubes in delivery condition shall not exceed HR45N 25 (for reference only, not for acceptance).
6.3.2 The hardness of GH4163 tubes in delivery condition shall not exceed HV 230.
6.4 Flaring Test
6.4.1 Tubes with a nominal outer diameter ≤ 150 mm and nominal wall thickness ≤ 10 mm made of GH1140, GH3030, GH3039, GH3044, GH3128, GH3536, and GH3625 shall undergo a flaring test. After testing, the sample shall show no visible cracks, splits, or other defects.
