JB/T 10265-2001 Technical requirements for upper and lower disc forgings for hydro-generators

JB/T 10265—2001 This standard specifies the technical conditions, test methods, inspection rules, certificates and markings for forgings for upper and lower discs of hydro-turbine generators. This standard is published for the first time. JB/T 10265-2001 Technical conditions for forgings for upper and lower discs of hydro-turbine generators JB/T10265-2001 Standard download decompression password: www.bzxz.net

ICS 77.140.85
Machinery Industry Standard of the People's Republic of China
JB/T10265—2001
Technical Conditions
Forging specification for upper and lower disks for hydraulic generators
2001-06-04 Issued
China Machinery Industry Federation
2001-10-01 Implementation
JB/TJ0265—2091
This standard was proposed and approved by Xiangyang Large Forgings Research Institute. The drafting units of this standard are Harbin Large Electric Machine Research Institute, Harbin Electric Machine Co., Ltd., and Dongfang Electric Machine Co., Ltd. The main drafters of this standard are Xia Bianheng, Zhao Nongming, Jiu Chenghai, Fan Hongyu, and Xuan Pinfan. This standard is published for the first time.
Machinery Industry Standard of the People's Republic of China
Technical Conditions
Forging periticatiox tor upper tnd lower daks for hydraulic generators
JB/T 10265—2001
This technical standard specifies the technical conditions, test methods, inspection rules, certificates and markings for the upper and lower daks of hydraulic generators. 3/Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid for the following countries, and all standards will be revised. The parties using this standard should consider the possibility of using the latest versions of the following standards. GB/T 222—1984
Chemical analysis of steel by sampling by trial method
Chemical analysis of steel and alloys
GB/T 223—1981-1997
Chemical analysis of iron and alloys
GB/T 228-1987
GB/T2291994
JB4730-1994
JB/T 8468--1996
3 Order within the scope of the contract
Method for Charpy notch impact test of metal fittings
Non-indentation test of pressure vessels
Test method for forging steel parts
3.1 The purchaser shall specify the forgeability grade, steel type, standard end and required supplementary test items in the contract. 3.2 Delivery drawings of forging dimensions indicating the location of mechanical property test specimens shall be provided (finishing drawings shall be provided if necessary). The grade and steel number of forgings shall be marked on the drawings as follows: Number
Forging grade × Number of this standard
4 Technical requirements
4.1 Manufacturing process
4.1.tSmelting and casting
Forgings shall be smelted in alkaline electric furnaces. They may be smelted by other methods that ensure good quality. Before forging or ingot casting, the molten steel shall be vacuum degassed. During vacuum treatment, the ultimate strength of the vacuum system is usually less than 133°C: 4.1.2 Forging
4.1.2.1 There shall be sufficient cutting discs at the upper and lower ends of the steel chain to ensure that the forged parts are free of shrinkage cavities and unacceptable segregation. 4.1.2.2 Forging should be performed on a forging machine with sufficient energy to fully forge the entire surface of the light part. Approved by China Machinery Industry Federation on June 4, 2001 and implemented on October 1, 2001
4.1.3 Heat treatment
The heat treatment after forging is normalizing and tempering
4.2 Chemical composition
JB10265-2001
The chemical composition of steel for forgings shall comply with the provisions of Table 1. Table Chemical composition
20MnSi
I8MnMNb
20MnMo
0.16~0.22
0.16-0.22
0.17--023
0.60~0.80
0.17.-0.37
Note: When the user needs to lose S0.00,
Mechanical properties
1.00~1.30bzxZ.net
1.20-1.50
0.90-1.30
The tangential mechanical properties of forgings after heat treatment meet the requirements of Table 2. s
Table 2 Mechanical properties
Part forging
4.4 No defects detection
4.4.1 Surface quality
Part surface defects such as cracks, self-points, heavy skin and folding sleeves are not allowed. 4.4.2 Ultrasonic flaw detection
4.4.2.! Sensitive parts need to be ultrasonically tested, and the results should meet the following requirements: No cracks or point defects are allowed:
b) Single defect When the base diameter is assessed according to the intermediate assessment of Table 8-6 of J1730-1994: =) The bottom wave reduction caused by the defect is assessed according to the intermediate assessment of Table 8-7 of 4730-1994; Mo
0.45-0.60
.15--0.25
0.02 0-0.045
The percentage of dense defects in the total number of defects is assessed according to D4730-1994, %
Push steel
20MnSi
20MnMo
IMnMoNb
4.4.2.1When the ultrasonic flaw detection results of the fake parts exceed the above provisions, the supply and demand parties shall negotiate, but whether the parts are used or not shall be decided by the demand party.
4.4.2.3, after the forgings are repaired, the repair welding area and other solid parts shall be re-inspected with the longitudinal wave straight probe and the oblique wave probe shall be used for detection. The detection results shall meet the following requirements: a) No integral effect is allowed. Unfused defects; b) No reflection of the amplitude of the reverse wave in the judgment line and the cautious area; The horizontal wrinkle inspection is subject to "destruction acceptance.
4. 5 Repair welding
JB/T1 No. 265—2001
When there are excessive defects in forgings: local defects can be removed, but if the depth exceeds 75%, repair welding is required after the defects are eliminated. When serious defects are found and repair welding is required, the required force should be consulted before repair welding. Before repair welding, it should be inspected for powder and can be welded when there is no residual depression. After the shock, stress relief treatment should be carried out to ensure that there is no deformation during use. The repair welding area and the surrounding 25mm area are re-tested with magnetic powder and super two-dimensional flaw detection to meet 4.4.1 and 4 .4.2.4.6 For very thick lower grinding plates, in order to ensure the proper amount of welding in the future, it is recommended to use a structure with a boss to reduce the stress generated during short-circuiting. In the industry,
5 Inspection rules and test analysis
5.1 Chemical composition analysis
5.1.1 The supplier shall take samples for analysis according to GB/222 for each batch of molten steel during pouring. 5.1.2 If the test and sample fail, or do not meet the analysis requirements, the supplier may take alternative samples at appropriate locations near the surface of the steel or forging to determine the composition of the molten steel:
5.2 Finished product analysis
Buyer Sampling can be carried out on the test ring or on the mechanical properties test bar for analysis. The analysis results shall comply with the provisions of Table 1, and the deviations in Table 3 are allowed.
3 The analysis of finished products exceeds the upper and lower limits of the specified tolerances. The maximum range of the specified tolerances is 0.26-(0.55
0.41~1.15
The maximum diameter of the finished forging is measured by the analysis method G223, or other force methods that ensure the same measurement accuracy are used for analysis. 5.3 Primary performance test
>400mm
Joint sample The position is as specified in the order drawing. On the tangential test ring, take a tensile test specimen and an impact test specimen at the relative 180° position.
5.4 Test method and specimen size
5.4.1 The tensile test method is in accordance with GB/T228, and the test specimen is a standard specimen with a diameter of 10mm and a gauge length of 50mm. 5.4.2 The impact test method is in accordance with GB/T229, and the specimen size is a Metz specimen of 10mm×10mm×55mm. 5.4.3 Ultrasonic flaw detection
The ultrasonic flaw detection method is in accordance with JB4730. 5.4. 4 Avoid powder detection
Carbon flaw detection method is carried out in accordance with 8468.
5.5 Retest and reheat treatment
JB/T 1$265—2001
5.5.1 Mechanical property inspection If the test result of a sample does not meet the requirements, it is allowed to take another sample adjacent to the sample for testing. If the mechanical properties are unqualified due to cracks or white spots, retest is not allowed. 5.5.2 If any mechanical property of the forging fails to meet the requirements, the forging shall be reheat treated. After reheat treatment, the mirror piece shall be sampled and tested as a new piece.
6 Acceptance and Certificate of Qualification
6. 1 Acceptance
The plated parts shall be inspected by the supplier's technical inspection department according to the requirements of this standard and the order drawing. Delivery shall be made only after all the requirements of this standard and the order drawing are met.
6.2 Certificate of Conformity
When delivering the goods, the supplier must provide the buyer with a certificate of conformity, which shall include the following contents: a) Order contract number:
b) Order drawing number:
c) Melting furnace number:
d) Forging card number:
e) Chemical composition analysis results:
Primary school performance test results:
d) Non-destructive testing results (detailed information on defects within the permitted range of this standard shall be provided if required by the purchaser) h) Final heat treatment results Process teaching data (provide repair welding procedures and main process parameters of post-weld heat treatment and welding personnel qualifications for repair welded parts). 6.3 Return regulations. After the supplier's acceptance, if unacceptable defects are found again during the buyer's re-inspection and during the processing, the buyer should notify the supplier in time and the two parties will negotiate to solve the problem. Marking and packaging. The supplier shall mark the return number, furnace number, and component card number on the surface of the forging and cover it with white paint. The forgings shall be properly packaged to avoid damage when the parts are transported to the buyer.
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