General purpose industrial valves - Specification of copper alloy castings
1 Scope
This standard specifies the grading, designations, marking method, codes, technical requirements, inspection methods and rules as well as marking, packaging, transportation and storage of copper alloy castings.
This standard is applicable to copper alloy castings (hereinafter referred to as castings) of valves and pipe fittings in sand casting and metal mold casting (non-pressure casting).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 228.1 Metallic materials - Tensile testing - Part 1 : Method of test at room temperature
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 1176 Casting copper and copper alloys
GB/T 6414 Castings - Dimensional tolerances and geometrical tolerances and machining allowances
GB/T 11351 Mass tolerances of casting
GB/T 13927 Industrial valves - Pressure testing
3 Grading of castings
Castings have 4 grades, see Table 1 for the grading and assessment requirements.
Table 1 Assessment requirements
Grade Assessment requirements
I Chemical composition and mechanical properties
II Mechanical properties
III Chemical composition
IV Not required
4 Designation, marking method and codes of castings
4.1 Designation
See Table 2 for the designation of castings.
Foreword I
1 Scope
2 Normative references
3 Grading of castings
4 Designation, marking method and codes of castings
4.1 Designation
4.2 Marking method
4.3 Codes of casting methods
5 Technical requirements
5.1 Casting
5.2 Chemical composition
5.3 Mechanical properties
5.4 Quality requirements
6 Inspection methods and rules
6.1 Chemical composition
6.2 Mechanical properties
6.3 Housing test
7 Marking, packaging, transportation and storage
