This standard specifies the technical requirements, test methods, inspection rules, marking, etc. of copper alloy castings (hereinafter referred to as "castings").
This standard is applicable to sand mold castings and special castings (metal mold casting, continuous casting and centrifugal casting) for rolling stock (including rail cranes). Special requirements (if any) shall be indicated in drawing or technical document.
2 Normative References
GB 1176 Specification for Cast Copper Alloys
GB 6414 Dimensional Tolerances for Castings
GB 6060.1 Roughness Comparison Specimens - Cast Surfaces
GB 5122.1~20 Methods for Chemical Analysis of Brass
GB 8002.1~15 Methods for Chemical Analysis of Tin Bronze
GB 5678 Sampling Methods of Spectrochemical Analysis for Cast Alloys
GB 6397 Metallic Materials - Test Pieces for Tensile Testing
GB 228 Tensile Test Method for Metal
GB 231 Metallic Materials - Brinell Hardness Test
GB/T 11350 Machining Allowances on Castings
GB/T 11351 Mass Tolerances for Castings
JB/T 5105 Casting Form Pattern Draft
GB 961 Chemical Analysis Method of High Manganese Aluminum Bronze for Propeller
YB 55 Methods for Chemical Analysis of Aluminum Bronze
3 Technical Requirements
3.1 The designation, casting method, chemical composition and mechanical performance of castings shall be selected according to the requirements of GB 1176. Common designations of castings shall meet the requirements of Annex A.
3.2 Classification (Table 1) shall be indicated in product drawing, and the unindicated castings shall be treated as Class III.
3.3 Label to be indicated in casting drawing
Label example: ZCuSn5Pb5Zn5I-Li
3.4 Sand burning, sand inclusion and metallic projections on castings shall be eliminated; residual casting heads not affecting processing, assembling and use shall meet the requirements of Table 2, and that on non-machined surface shall be smoothly transited to casting surface.
