GB/T 15008-2025 Corrosion resistant alloy bars 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 77.140.60 CCS H59
People's Republic of China National Standard
GB/T 15008-2025
Replacing GB/T 15008-2020, GB/T 38589-2020
Corrosion resistant alloy bars
Issued on August 29, 2025
Implemented on March 1, 2026
Issued by State Administration for Market Regulation
Standardization Administration of China
Contents
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and designations
5 Ordering information
6 Manufacturing process
7 Technical requirements
8 Test methods
9 Inspection rules
Corrosion resistant alloy bars
1 Scope
This document specifies the classification, designations, ordering information, manufacturing process, technical requirements, test methods, inspection rules, packaging, marking, and quality certificate for corrosion-resistant alloy bars.
This document applies to hot-rolled and forged corrosion-resistant alloy bars (hereinafter referred to as bars) for use in corrosive media.
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
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 229 Metallic materials-Charpy pendulum impact test method
GB/T 230.1 Metallic materials-Rockwell hardness test-Part 1: Test method
GB/T 702-2017 Dimensions, shape, weight, and tolerances for hot-rolled steel bars
GB/T 908-2019 Dimensions, shape, weight, and tolerances for forged steel bars
GB/T 2101 General rules for acceptance, packaging, marking, and quality certificate for section steel
GB/T 2975 Steel and steel products-Sampling location and preparation of test pieces for mechanical testing
GB/T 3207-2008 Bright steel
GB/T 4162-2022 Ultrasonic testing method for forged and rolled steel bars
GB/T 6394 Standard test method for determining average grain size
GB/T 8170 Rules for rounding off numerical values and expression and judgment of limiting values
GB/T 8647 (All parts) Chemical analysis methods for nickel
GB/T 10561-2023 Determination of non-metallic inclusion content in steel-Standard chart method for microscopic examination
GB/T 14999.2 Test methods for superalloys-Part 2: Transverse macro structure and defect examination by acid etching
GB/T 15260 Corrosion of metals and alloys-Intergranular corrosion test method for nickel alloys
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 36164 High-alloy steel-Determination of multi-element content-X-ray fluorescence spectrometry (conventional method)
GB/T 38939 Nickel-based alloys-Determination of multi-element content-Spark discharge atomic emission spectrometry (conventional method)
YB/T 4395 Steel-Determination of molybdenum, niobium, and tungsten content-Inductively coupled plasma atomic emission spectrometry
YS/T 325.2 Chemical analysis methods for nickel-copper alloys-Part 2: Determination of copper content-Electrolytic gravimetric method
3 Terms and definitions
This document does not require defined terms and definitions.
4 Classification and designations
Bars are classified into the following two categories based on intended processing method:
UP bars for pressure processing;
b) UC bars for cutting processing.
5 Ordering Information
Contracts or orders placed in accordance with this document shall include the following items:
a) Document number of this specification;
b) Product name;
c) Unified digital code (or designation);
d) Weight (or quantity);
e) Dimensions;
f) Manufacturing process (melting method);
g) Delivery condition;
h) Intended use (if not specified, bars shall be for machining purposes by default);
i) Special requirements.
6 Manufacturing Process
6.1 Melting Method
Unless otherwise specified in the contract, the melting method shall be at the supplier's discretion.
6.2 Delivery Condition
Bars shall be delivered in either hot-rolled (or forged) or solution-treated condition, or in hot-rolled (or forged) or solution-treated followed by peeling, grinding, or turning, as specified in the contract.
7 Technical Requirements
7.1 Unified Digital Code (or Designation) and Chemical Composition
7.1.1 The unified digital code (or designation) and chemical composition (as-melted analysis) of the alloy shall comply with Table 1.
7.1.2
The allowable deviation of finished product chemical composition shall comply with GB/T 222.
7.2.2 Mechanical Properties
Bars delivered in solution-treated condition shall have their mechanical properties tested using samples taken from the delivered material. The mechanical properties shall comply with Table 2. For age-hardenable alloys (NS4101, NS4301, NS6500), the test samples shall undergo aging treatment before testing, and their mechanical properties shall comply with Table 3. For bars with a diameter exceeding 80 mm, the mechanical performance criteria shall be agreed upon between the supplier and purchaser.
7.2.3 Sample
The sample shall have a diameter of 25 mm. For bars with a diameter less than 25 mm, the entire bar may be solution-treated or aged directly before testing.
7.3 Low-Magnification Examination
The transverse acid-etched low-magnification samples of bars shall show no visible residual shrinkage cavities, blowholes, inclusions, or cracks.
7.4 Ultrasonic Testing
Bars shall undergo ultrasonic testing. For nominal diameters ≤ 80 mm, the results shall comply with Class A of GB/T 4162—2022. For nominal diameters > 80 mm, the results shall comply with Class B of GB/T 4162—2022.
7.5 Surface Quality
7.5.1 Hot-Rolled (Forged) or Hot-Rolled (Forged) Ground Bars
7.5.1.1 Bars for Pressure Processing
Bars intended for pressure processing shall be free from cracks, folds, laps, inclusions, or
