Stainless steel blade castings for hydraulic turbines
1 Scope
This standard specifies the ordering requirements, manufacturing process, technical requirements, inspection rules and test methods, quality certificate, marking and packaging of stainless steel blade castings for welded construction runner for Francis hydraulic turbines, axial-flow hydraulic turbines and tubular hydraulic turbines.
This standard is applicable to the ordering, manufacturing and inspection of stainless steel blade castings for welded construction runner for Francis hydraulic turbines, axial-flow hydraulic turbines and tubular hydraulic turbines in various specifications, and is applied as the basis for the suppliers' blank delivery or delivery after rough grinding or rough machining.
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 documents (including any amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223 (All parts) Methods for chemical analysis of iron, steel and alloy
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 6060.1 Roughness comparison specimens - Cast surfaces
GB/T 7233.1 Steel castings - Ultrasonic examination - Part 1: Steel castings for general purposes
GB/T 9443 Penetrant testing for steel castings
GB/T 9444 Magnetic particle testing for steel castings
GB/T 11352 Carbon steel castings for general engineering purpose
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition
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3 Order requirements
3.1 The purchaser shall indicate the applicable standard(s), casting name, material designation, order quantity and supply condition, the corresponding technical requirements and inspection items specified by the supplier and the purchaser, and other additional instructions beyond those required by this standard in the order contract or order agreement.
3.2 The purchaser shall provide the order drawings and IGS documents jointly approved by both parties, and indicate the product dimensions, tolerances, surface roughness requirements, number, position and size of test blocks, etc.
4 Manufacturing process
4.1 Smelting
The steel for blades shall be smelted by an electric arc furnace or ladle refining furnace, and may also be smelted with the methods confirmed by the supplier and the purchaser.
4.2 Casting
Foreword II
1 Scope
2 Normative references
3 Order requirements
4 Manufacturing process
4.1 Smelting
4.2 Casting
4.3 Heat treatment
4.4 Repair welding
4.5 Machining
5 Technical requirements
5.1 Chemical compositions
5.2 Mechanical properties
5.3 Quality of castings
6 Inspection rules and test methods
6.1 Chemical composition analysis
6.2 Mechanical property test
6.3 Evaluation of surface roughness
6.4 Non-destructive testing
6.5 Retest
6.6 Re-heat treatment
7 Quality certificate
8 Marking and packaging
Table 1 Chemical compositions of castings
Table 2 Reference values of hydrogen, oxygen and nitrogen content (mass fraction)
Table 3 Mechanical properties
