This standard specifies the technical requirements, acceptance rules, test methods, marking and quality certificate, storage, packaging and transportation of couplers and coupler yokes for railway locomotive and rolling stock.
This standard is applicable to the automatic couplers, coupler yokes, coupler parts and followers for newly casted railway locomotive and rolling stock manufactured with Grades C and E steel. The forging of coupler yokes may be carried out by making reference thereto.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223 Methods for Chemical Analysis of Iron, Steel and Alloy
GB/T 228 Metallic Materials - Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892:1998)
GB/T 229 Metallic Materials - Charpy Notch Impact Test (GB/T 229-1994, eqv ISO 148:1983)
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method (GB/T 231.1-2002, eqv ISO 6506-1:1999)
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-alloy steel (Routine Method)
GB/T 5118-1995 Low Alloy Steel Covered Electrodes
GB/T 6060.1 Roughness Comparison Specimens - Cast Surfaces
GB/T 6414-1999 Castings - System of Dimensional Tolerances and Machining Allowances (eqv ISO 8062:1994)
GB/T 6803 Test Method for Drop-weight Test to Determine Nil-ductility Transition Temperature of Ferritic Steels
GB/T 8923-1988 Rust Grades and Preparation Grades of Steel Surfaces Before Application of Paints and Related Products (eqv ISO 8501-1:1987)
HG/T 2453 Alkyd Varnish
JB/T 8290 Magnetic Particle Flaw Detectors
TB/T 1669 Gauge for No.13 Coupler
TB/T 1670 Gauge for No.15 Coupler
TB/T 2047-2005 Technical Specification for the Supply of Magnetic Powder for Railway Magnetic Particle Testing
TB/T 2451-1993 Metallographic Inspection for Non-metallic Inclusion in Cast Steel
TB/T 2604 Gauge for No.13A Type Coupler Yoke
TB/T 2942-1999 Specification of Purchase and acceptance of Steel Castings for Railway
TB/T 2943.1 Couplers Components for Railway Locomotive and Vehicle - Part 1: Specification of Knuckle Pivot Pin and Yoke Key
TB/T 2943.2 Couplers Components for Railway Locomotive and Vehicle - Part 2: Specification of Anticreep Top Locklift Assembly for No.13A Type Coupler
TB/T 2950 Coupler Connection Contour for Locomotives and Rolling Stock
TB/T 2985 Test Method of Metallic Materials - Dynamic Tear
3 Technical Requirements
3.1 Basic Requirements
3.1.1 Couplers and coupler yokes shall be manufactured in accordance with the product drawing approved through established procedure.
3.1.2 The dimension of coupler connection contour shall meet the requirements of TB/T 2950.
3.2 Material Requirements
3.2.1 Chemical components
Chemical components of Grades C and E steel shall be in accordance with those specified in Table 1.
