TB/T 2708-2023
Rolled steel integral wheel passenger car (English Version)
- Standard No.
- TB/T 2708-2023
- Language
- Chinese, Available in English version
- Release Date
- 2023
- Published By
- Professional Standard - Railway CN / TB
- Latest
- TB/T 2708-2023
- Replace
- TB/T 2708-1996 TB/T 2562-1995 TB/T 2995-2000
- Introduction
Background of Standard Revision and Technological Evolution
This revision integrates the core contents of TB/T 2708-1996, TB/T 2562-1995 and TB/T 2995-2000. The main technical upgrades are reflected in:
Technical Dimensions 1996 Standard New Contents of 2023 Edition Material Requirements CL60 Steel Only Newly Added CL65K Wheel Steel (5.3.2) Mechanical Properties Basic Indicators Add rim impact performance (≥20J) and point A hardness gradient (5.3.3) Test method Conventional test Update ultrasonic/magnetic particle test specifications (Appendix C/D)
Analysis of core technical requirements
1. Materials and manufacturing process
The new standard requires that wheel steel must undergo external refining and vacuum degassing treatment (5.1.1), and the total oxygen content of the finished product must be ≤2.0×10-5 (5.2.1.4). The chemical composition control requirements of the new CL65K steel are as follows:
2. Key mechanical performance indicators
Typical case: Under the operating conditions of 200km/h, the hardness gradient of the rim-spoke transition zone (point A) of a certain type of passenger car wheel is improperly controlled, resulting in early cracks. The new standard clearly requires that the hardness of this area must be 10HBW lower than that of the tread area (5.3.3.1).
Key points for upgrading detection technology
1. Ultrasonic detection specifications (Appendix C)
Using an automatic scanning device, the system sensitivity is required to retain at least 30dB margin when detecting φ2mm flat-bottom holes (C.2.2.3). Defect determination adopts the distance amplitude curve method, focusing on:
2. Implementation of magnetic particle testing
The test must be completed after machining and before shot peening, and the residual magnetic field strength is ≤0.7mT (5.7.1.4).
Implementation suggestions
- Process control:During heat treatment, the web must be protected from water ingress, and the number of re-heat treatments must be ≤2 times (5.2.1.2)
- Quality traceability:Each batch of wheels should retain complete data such as smelting analysis, hydrogen content, and total oxygen content (9.2)
- Supplier management:Focus on the impact performance compliance of CL65K steel (Table 5)
TB/T 2708-2023 Referenced Document
- GB/T 10561-2005 Steel.Determination of content of nonmetallic inclusions.Micrographic method using standards diagrams
- GB/T 11261 Steel and lron - Determination of oxygen content - The pulse heating inert gas fusion-infra-red absorption method
- GB/T 1182 Geometrical product specifications(GPS)—Geometrical tolerancing—Tolerances of form, orientation, location and run-out
- GB/T 13298 Inspection methods of microstructure for metals
- GB/T 15822.2 Non-destructive testing - Magnetic particle testing - Part 2: Test media*， 2024-09-29 Update
- GB/T 15822.3 Non-destructive testing - Magnetic particle testing - Part 3: Equipment*， 2024-09-29 Update
- GB/T 18838.3-2008 Preparation of steel substrates before application of paints and related products.Specifications for metallic blast-cleaning abrasives.Part 3:High-carbon cast-steel shot and grit
- GB/T 18838.4-2008 Preparation of steel substrates before application of paints and related products.Specifications for metallic blast-cleaning abrasives.Part 4:Low-carbon cast-steel shot
- GB/T 20066 Steel and iron.Sampling and preparation of samples for the determination of chemical composition
- GB/T 20123 Steel and iron - Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method)
- GB/T 20125 Low-alloy steel.Determination of multi-element contents.Inductively coupled plasma atomic emission spectrometric method
- GB/T 226 Test method for macrostructure and defect of steel by etching
- GB/T 228.1 Metallic materials—Tensile testing—Part 1: Method of test at room temperature
- GB/T 229 Metallic materials—Charpy pendulum impact test method
- GB/T 231.1 Metallic materials—Brinell hardness test—Part 1: Test method
- GB/T 27664.1-2011 Non-destructive testing.Characterization and verification of ultrasonic test equipment.Part 1:Instruments
- GB/T 27664.2-2011 Non-destructive testing.Characterization and verification of ultrasonic test equipment.Part 2:Probes
- GB/T 27664.3-2012 Non-destructive testing.Characterization and verification of ultrasonic test equipment.Part 3:Combined equipment
- GB/T 4336 Determination of multi-element content in carbon steel and medium and low alloy steel Spark discharge atomic emission spectrometry (conventional method) Amendment No. 1
- GB/T 9445 Qualification and certification of non-destructive testing personnel*， 2024-09-29 Update
- ISO 6933:1986 Railway rolling stock material; magnetic particle acceptance testing
- JB/T 10174-2008 Methods of quality inspection on shot-peening for steel-iron parts
- TB/T 3031-2002 Evaluation of low-magnification microstructure defects in the radial full-section of steel-rolled integral wheels for railways
TB/T 2708-2023 history
- 2023 TB/T 2708-2023 Rolled steel integral wheel passenger car
- 1997 TB/T 2708-1996 Technical specification for steel-rolled monolithic wheels for railway express passenger cars
TB/T 2708-2023 Rolled steel integral wheel passenger car has been changed from TB/T 2562-1995 Test method for wheel static balance and wheel set dynamic balance for railway passenger cars.
TB/T 2708-2023 Rolled steel integral wheel passenger car has been changed from TB/T 2995-2000 Ultrasonic inspection of railway wheels and tires.
