Thrust runner forgings for hydraulic generators - Technical specification
1 Scope
This standard specifies the order requirements, manufacturing process, technical requirements, inspection rules, test methods, acceptance, quality certificate, marking and packaging, etc. of thrust runner forgings for hydraulic generators.
It is applicable to the order, manufacturing and inspection of thrust runner forgings for hydraulic generators.
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 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 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-alloy steel (Routine method)
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition
JB/T 4730.3-2005 Nondestructive testing of pressure equipments - Part 3: Ultrasonic testing
JB/T 4730.4-2005 Nondestructive testing of pressure equipments - Part 4: Magnetic particle testing
3 Order requirements
3.1 The purchaser shall indicate the adopted standard, material designation, corresponding technical requirements specified by the supplier and the purchaser and inspection items as well as inspection items beyond this standard in the order contract.
3.2 The purchaser shall provide rough machining drawings indicating the dimensions and technical requirements of forgings (finish machining dimensions if necessary).
4 Manufacturing process
4.1 Smelting
Steel used for forgings shall be smelted in basic electric furnace. As agreed by the purchaser, other smelting methods meeting the requirements of this standard may also be adopted.
4.2 Forging
4.2.1 The sprue and dead head of steel ingot shall have adequate cut-off quantity so as to ensure that the forging is free from injurious defects like shrinkage cavity and excessive segregation.
4.2.2 The forging press shall be provided with sufficient capability so as to ensure the forging penetration of the whole forging section during forging.
4.3 Heat treatment
At the completion of forging for forgings, normalizing and tempering or quenching and tempering shall be conducted by the supplier so as to ensure the even texture and performance of the forgings, especially the better hardness uniformity of thrust runner surface.
4.4 Rough machining
After the forging is subject to heat treatment, the supplier shall reserve appropriate allowance for rough machining according to the order drawing.
4.5 Stress relief treatment
Foreword i
1 Scope
2 Normative references
3 Order requirements
4 Manufacturing process
4.1 Smelting
4.2 Forging
4.3 Heat treatment
4.4 Rough machining
4.5 Stress relief treatment
4.6 End-of-manufacturing machining
5 Technical requirements
5.1 Chemical composition
5.2 Mechanical properties
5.3 Hardness
5.4 Non-destructive testing
6 Inspection rules and test methods
6.1 Chemical composition analysis
6.2 Mechanical property test
6.3 Hardness inspection
6.4 Non-destructive testing
7 Acceptance and quality certificate
8 Marking and packaging
Table 1 Chemical composition
Table 2 Chemical properties
