1 Scope
This standard specifies the order requirements, manufacturing process, technical requirements, inspection rules, test methods, acceptance, quality certificate, marking and packaging of vacuum treated alloy steel forgings for rotor and shaft forgings of 25 MW to 200 MW steam turbines.
This standard is applicable to the order, manufacturing and inspection of vacuum treated alloy steel forgings for rotors and shafts of steam turbines with stream temperature not exceeding 565 ℃
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 2039 Metallic materials - Uniaxial creep testing method in tension
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-alloy steel (routine method)
GB/T 6394 Determination of estimating the average grain size of metal
GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams
JB/T 1581 Ultrasonic testing method for rotor and shaft forgings of steam turbines and turbine generators
JB/T 8468 Magnetic particle testing for steel forgings
JB/T 8888 Test method for measuring residual stresses by the ring-core method in rotor forgings for turbine and generator
JB/T 9021 Thermal stability test method of stream turbine main shafts and rotor forgings
3 Order requirements
3.1 The purchaser shall indicate the adopted standard, material designation, corresponding technical requirements and inspection items as well as inspection items beyond the scope of this standard in the order contract.
3.2 The purchaser shall provide the order drawing of forgings with marked sampling position of mechanical property test and finish machining dimension of blade groove depth.
3.3 The purchaser shall indicate the items to be inspected on site in the contract.
Foreword i
1 Scope
2 Normative references
3 Order requirements
4 Manufacturing process
4.1 Smelting and casting
4.2 Forging
4.3 Heat treatment
4.4 Machining
4.5 Welding
5 Technical requirements
5.1 Chemical composition
5.2 Mechanical properties
5.3 Uniformity of hardness
5.4 Non-destructive testing
5.5 Heat stability
5.6 Metallographic structure
5.7 Residual stress
5.8 Dimension and surface roughness
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
6.5 Metallographic inspection
6.6 Residual stress determination
6.7 Heat stability test
6.8 Retest
6.9 Re-heat treatment
7 Acceptance and quality certificate
8 Marking and packaging
