Heavy Mechanical General Techniques and Standards - Part 4: Iron Casting
1 Scope
This part of JB/T 5000 specifies the technical requirements, test methods, inspection rules, marks and certification of iron castings.
This part is applicable to grey iron castings, spherical graphite iron castings and heat resistant iron castings which are poured by sand mold or casting mold whose thermal conduction is similar to the sand mold in the heavy machinery.
2 Normative References
The following normative documents contain provisions which, through reference in this part of JB/T 5000, constitute provisions of this part. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this part are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative documents referred to applies.
GB/T 1348 Spherical Graphite Iron Castings
GB/T 6060.1 Roughness Comparison Specimens - Cast Surfaces (GB/T 6060.1-1997, eqv ISO 2632.3:1979)
GB/T 6414 Castings - System of Dimensional Tolerances and Machining Allowances (GB/T 6414-1999, eqv ISO 8062:1994)
GB/T 9437 Heat Resistant Iron Castings
GB/T 9439 Grey Iron Castings
GB/T 11351 Mass Tolerances for Castings
JB/T 5000.12 Heavy Mechanical General Techniques and Standards - Part 12: Paint
3 Technical Requirements
3.1 Grade, Chemical Composition and Mechanical Property of Iron Castings
3.1.1 Grade and mechanical property of the grey iron castings shall be in accordance with those specified in GB/T 9439. Chemical composition shall be determined by the supplier, but it shall live up to the grades and corresponding mechanical property indexes specified in GB/T 9439. In case of any special requirement from the buyers, it shall be determined by the supplier and buyer through negotiation.
3.1.2 Grade and mechanical property of the spherical graphite iron castings shall be in accordance with those specified in GB/T 1348. Chemical composition shall be determined by the supplier, but it shall live up to the grades and corresponding mechanical property indexes specified in GB/T 1348. In case of any special requirement from the buyers, it shall be determined by the supplier and buyer through negotiation.
3.1.3 Grade, chemical composition and mechanical property of the heat resistant iron castings shall be in accordance with those specified in GB/T 9437.
3.2 Dimensional Tolerances and Distribution of Tolerance Zone
3.2.1 Dimensional tolerances of castings shall be in accordance with those specified in GB/T 6414. See Table 1 for common grade codes and tolerances. The same tolerance grade shall be selected for the same casting. The tolerance grades shall be selected according to the basic dimensions of the rough castings.
Foreword II
1 Scope
2 Normative References
3 Specifications
3.1 Grade, Chemical Compositions and Mechanical Properties of Iron Castings
3.2 Dimensional Tolerances and Distribution of Tolerance Zone
3.3 Shifts (Mismatches)
3.4 Machining Allowances
3.5 Geometric Form, Dimension of Castings
3.6 Heat Treatment of Castings
3.7 Mass Tolerances for Castings
3.8 Arm Sprue Cut Allowances of Castings and Their Treatment Methods
3.9 Surface Quality Requirements
3.10 Repair Welding of Castings
3.11 Shot Blasting and Priming
4 Test Methods
5 Test Rules
5.1 Test Rights and Test Sites
5.2 Lot Layout
5.3 Evaluation and Retest of Test Numbers, Test Results
5.4 Geometric Form and Dimension
5.5 Casting Surface Quality
5.6 Test Validity
5.7 Physico-chemical Examination of Iron Castings
6 Marks and Certification
Annex A
