This standard specifies the technical requirements, test method and acceptance regulations of cast iron used for fan blower and compressor.
This standard is applicable to turbine fan, blower, compressor, expander as well as such alloy cast irons (hereafter referred to as castings simply) as the gray cast iron, spheroidal-graphite cast iron, medium-manganese wear-resistant spheroidal-graphite cast iron, corrosion-resistant high silicon cast iron and heat resistant iron being used for Roots and Jaeger blowers.
Foreword I 1 Scope 2 Normative References 3 Technical Requirements 3.1 Materials 3.2 Production Methods and Heat Treatments: 3.3 Mechanical Properties and Chemical Composition; 3.4 Metallurgical Structure 3.5 Geometric Shapes, Finishing Allowances and Dimensional Tolerances; 3.6 Mass 3.7 Surface Quality 3.8 Renovation 3.9 Defects 3.10 Defect Repairing Methods and the Corresponding Quality Requirements 3.11 Leakage Test 3.12 Prime Paint 4 Test Method and Inspection Rules 5 Marks and Certificates 6 Rejections Annex A (Normative) Pattern Drafts of Casting Wooden Models (JB/T 5105) Annex B (Normative) Machining Allowances on Castings (RMA) (GB/T 6414) Annex C (Normative) Casting Dimensional Tolerances (GB/T 6414) Annex D (Normative) Grades of Mass Tolerances for Castings (GB/T 11351) Table 1: Coaxial Tolerances of Rotational Castings Table 2: Dimensional Tolerances of Three-cavity Castings Table 3: Mismatches (mm) Table 4: Range of Defects being Free from Repair Table 5: Permissible Repair Welding Range of Rough Casting Defect Table 6: Permissible Repair Welding Range of Defect Generating in Mechanical Processing Table 7: Minimum Wall Thickness of Sleeve (mm) Table A.1: Pattern Drafts of Casting Wooden Models Table B.1: Machining Allowances on Castings (RMA) mm Table C.1: Casting Dimensional Tolerances (mm) Table D.1: Grades of Mass Tolerances for Castings
