JB/T 8706-1998 Technical requirements for 50~200MW steam turbine generator rotor forgings without center hole
Some standard content:
1CS 77. 140. 89
Machinery Industry Standard of the People's Republic of China
JB/T87061998
50~200MW Steam Turbine Generator
Specification of the noncentral hole rotorsforgings used from so Lo 2ouMiw turbine generator1998-03-19 Issued
Ministry of Machinery Industry of the People's Republic of China
1998-07-01 Implementation
JBT8706
This standard was proposed and approved by Lianyang Renshi Block Parts Research Institute of the Ministry of Machinery Industry of China. Drafting units of this standard: Harbin Institute of Technology and Harbin Renshi Book Design Institute. The main drafters of this standard are Xue Fanying, Guo Huihai, Shen Xinfa, and Qi Lizhu. Scope
Machinery Industry Standard of the People's Republic of China
50~-200MW steam turbine generator
Technical requirements for the apneentral hole rotor forgings used from 50 to 20MW steam turbine generator JB/T 8706[998] This standard specifies the technical requirements, inspection specifications and operation methods, quality certificates and marks, etc. This standard is suitable for the ordering, manufacturing and quality inspection of replacement parts for the vacuum treated rotors of 50~200MW steam turbine generators without center holes. 2 Reference Standards
The provisions contained in the following standards are effective when the text standards of the provisions are used in the technical standards. All the versions shown are valid when the text standards are published. All the products will be revised, so the parties to the standards will discuss the possibility of using the latest versions of the following standards. GT 223-4R3 ~34)
GR22587
t:/1229-94
GH23I84
GH 534:-2
JH/T 1681-96
ASTMA75/A2Y5M.
ASTMA31-69
ASTM A370- 7?
ASTM E3EJ-7
3 Order requirements
Metal analysis method for steel and alloy
Metal tensile test method
Metal hardness test method
Metal average quality determination method
i0~20MW steam turbine generator system technology. Steam turbine generator system? Ultrasonic flaw detection of sensitive parts and forgings. Magnetic test method. Direct current magnetic test method. Test method for determining the DC magnetic properties of materials. Mechanical properties test method for products. Macroscopic corrosion test, inspection and evaluation method for steel products. 3.1 The purchaser shall specify the standard, grade, number, relevant requirements and inspection items in the contract or in the contract. The grade and number shall be marked on the customer's sample as follows: 3.2 The purchaser shall provide a drawing showing the location of the mechanical non-energy test specimen without a center hole for the forging (if necessary, provide the die processing scale) + technical requirements. 4. Manufacturing process
Approved by the Ministry of Machinery Industry on March 19, 1999
107.0 Practice
4.1.1 Smelting and casting method
JB/T8706—1998
4.1.11 Forging steel should be smelted in a practical electric drawing. With the consent of the purchaser, other methods of smelting can also be used. 4.1.1.2 Before casting, the casting process should be degassed by vacuum. In other treatment processes, the ultimate pressure of the vacuum system is usually lower than 133Pa.
41.2 Forging operation
4,1.2. The lower part of the ingot should have sufficient cutting edge to ensure the smoothness of the part and the non-permissible decomposition.4.1.2.2 The part should be forged on a press with a higher capacity so that the entire cut surface of the part is fully forged and the center line of the axis of the part is substantially aligned. The better end of the ingot should be the turbine end of the part. 4.1.3 Roundness
At each stage of manufacturing, the two ends of the part should be kept in the same position at the transition point where the diameter of the part changes. 4.1. Heat treatment
All forging processes are normalizing and consolidation.
4.1.4.2 Performance heat treatment is selective annealing and tempering. Normalizing and quenching treatment may also be used with the consent of the purchaser: Performance heat treatment shall be carried out repeatedly. The forging return and die hardness shall be as consistent as possible. 4.1.5 Machine added 1.
41.5.1 The center hole sequence is full chain, and the surface test degree R is 1.14..5.2 The shipped forgings shall comply with the size, tolerance and surface hardness requirements specified in the purchaser's order drawing. 4.2 Chemical composition 4.2.1 The analysis of the steel molten metal shall be in accordance with the requirements of Table 1. The analysis of the finished product of the equipment shall be in accordance with the requirements of Table 1. The 4.2.3 2m:MW rotor forging specification shall not exceed 1.5% without evaluation. Table: Chemical composition CrMoJA 3-IC-NiiMo 3iCrNisMo SHCrMiiMov 2hCrzNi4MeY r2 0.015 0.018 : sn,ojseo.ot8 .o.61sgo.ct8 Note: For use, the content shall not exceed 6.1%. 2. ou
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JH/T87061998
4.3.3 The fluctuation value of the control weakness or service strength between the shaft diameters of the test piece shall not exceed 70MPl. 4.4 Residual stress
The residual stress of the forging shall not be greater than 10% of the strength specified in Table 3. 4.5 Magnetic grease shall meet the following requirements:
2.5X10A/m
5. UX 10F A/m
10.0X104/m
15.0×10'A/m
2.0X10A/m
50. 0×10 4/m
4.6 Grain size
B=-1. 44T
The final inspection report of the structural inspection shall not be used as the basis for acceptance. 4.7 Hardness
The uniformity of hardness shall be the reference for the absolute value of hardness. The hardness shall not exceed 39HB5 on the same arc. The same line shall not exceed IS.
4.8 Forging inspection
4.8.1 Forgings shall be free of defects such as grain, overlap, etc., and the right to various tests shall be reserved, including pickling or magnetic inspection. 4.8.1.2 Pickling or acid powder inspection shall be carried out at both ends of the forging and at each end of the coagulation zone and at both shaft parts.
4.8, 1.3 The bearing parts and the ends of the bearing body are subjected to the standard area pickling magnetic particle inspection. The following results are drawn: On the area of the maximum side length of e is 1=r, a single trip with a length of 5~1rm is allowed. The decision is 1~:.5! Single defect within the display? 1, the registration department said that 5 is not allowed to show an average defect rate of 1 ear, and there are more than 21 single defective products, and the above provisions are not met. The supplier and demand party shall pre-process. 4.8.2 Ultrasonic deep square
The most complete part is made on the outer surface of the net. The results shall meet the following requirements:) No defects such as cracks, white spots and gradual holes are allowed. The smallest defect with a diameter of 2.1m is not allowed. There is no flow trap signal when the diameter is equal to or greater than .0mr.
c) In the general part center 415cm1 range, the measurement is calculated from the weight of the part below 13.0mm1cmw, and there are single defects with a diameter of 1.5m.) and dense defects with a diameter greater than or equal to 2.mr. ) Outside the ground, the depth is 25m. No single defect with a diameter greater than 3m (10cm or more) is allowed. No single defect with an equivalent diameter greater than 3.3m is allowed. The remaining parts are allowed to have scattered defects of ~4mm. The height of any defect is not less than the larger defect.
) The entire forging single defect, the teaching defect is about the same as the batch and the teaching allowance ratio exceeds the current provisions in Table 4. ! 2--2.MIIz rate, the minimum effective coefficient of lead parts analysis material is tB/m: 1
When the main point diameter is the standard network
4.3 center
JH/T8706-1998
Table 4 Single, equivalent diameter and number of defects produced by the production position to be allowed (pieces)
Transmission specification
4.8.3.1 When using a cleaning instrument to check, the inner surface of the center hole is not full of cracks, residual parts of the hole, pores, disasters, dragon marks, length 62. mrt defect Fl, the area of a certain small sensitive, the total effective number of defects of each category, is allowed to exceed 13. The basic provisions are as follows: a) The number of defects of the surface length of the center hole of the rotor shall not exceed 10; b) The number of defects of the length of the center hole of the rotor shall not exceed 10; b) The number of defects of the length of the center hole of the rotor shall not exceed 10; 3) The number of defects of the length of the center hole of the rotor shall not exceed 3; 4) The number of defects of the center hole of the rotor shall not exceed 10; 5) The number of defects of the center hole of the rotor shall not exceed 10; 6) The number of defects of the center hole of the rotor shall not exceed 10; 7) The number of defects of the center hole of the rotor shall not exceed 10; 8) The number of defects of the center hole of the rotor shall not exceed 10; 9) The number of defects of the center hole of the rotor shall not exceed 10; 10 ... The center said that the original aid was just over the idea, and the axial error of the beam mouth should not be too much. The straight line tolerance is the rate of the test. 5.1.1 Wear analysis 5.1.1, 1 piece of small steel is taken from each furnace of molten steel for reverse source analysis: the analysis station should report the results of the analysis. 5.1.1.2 If the test order does not do smelting analysis, the supplier can collect the sample from the appropriate position near the steel piece, and inform the demand side of the unit bone of the piece. The supplier should certify the product analysis of each light piece. The test order of the most common mechanical energy of the test piece is on the test order, and the city can take the energy certificate of the customer. The wind content is taken from the test range. bzxZ.net
5, 1. 3 method
Perform according to (23 head method
5.2 Mechanical properties inspection
5.2.1 In the case of heat treatment, the tensile test of grade 1 general parts shall be carried out according to (R228 method, the cold impact test shall be carried out according to GB/T223, the mechanical properties inspection of grade 1 parts shall be carried out according to ASTMA73 method, the impact test shall be carried out according to ASTMA37 method, and the V-type test shall be carried out according to the hot test of the factory in ASTMA37. 5.2.3 Diameter test shall be carried out according to the following provisions.
5.2.4 The maximum number of test specimens per unit shall be as follows: 5.2.4. Longitudinal test specimens: two pieces are provided for double Asia. 2 tensile test specimens and 2 impact test specimens are taken from each end. For parts with center holes, the samples are taken at 1/3 of the wall thickness. For parts without center holes, the samples are taken at 1/3 of the diameter. 5
JB/T$7061998
5.2.4.2 Tangential test specimens shall be cut from the test rings cut at 1/3 of the diameter of the shaft surface as close as possible to the shaft surface at both ends of the shaft. The supplier shall cut the ring at the shaft end with poor quality, and the buyer shall cut the ring at the other end. a) 2 tensile test specimens and 2 impact test specimens are taken from each test ring of level 1 forgings: b) 4 tensile test specimens and 2 impact test specimens are taken from each test ring of each end of the forgings, and they are taken from the same diameter relative to each other on the test rings.
5.2.4.3 For the radial test specimen, a light-weighted rod shall be taken at a point on the 1-axis line parallel to the radial test and the axis. The distance between the two axial bodies shall not be less than 3003. The hole diameter after the material is checked shall meet the requirements of the order. 3) Take 2 tensile test specimens (1 each) at the bottom of the two variable material sample molds. Take 1 pen-shaped impact test specimen and 1 test specimen for measuring the cell transformation degree at the outer ends of the adjacent tensile test specimens respectively:) The other two sets of materials shall be tested in the same way, that is, 2 tensile test specimens (1 each) at the outer ends. Take 1 room temperature impact test specimen and 1 test specimen for measuring the temperature of ... 1) The impact specimen for determining the tensile transition temperature shall be kept at 3 specified conditions, and both specimens shall show a plastic fracture of at least %; 2) The radial tensile specimen can be a specimen with a diameter of not less than 5umm, and the radial impact specimen shall use a 10mm×1mm×55mmV measuring opening test piece. 5.2.4.4 Center hole flow sample: Take 1 tensile strength specimen at least 4 times of the original shaft end to determine the tensile transition temperature. 5.3 Residual test 5.3.1 Use the ring cutting method or the ring center electric deformation method to eliminate the residual stress. .3.2 Both parties shall take a ring of mX25mm at one end of the forging shaft and use the method of measuring the average deformation of the ring before and after forging to calculate the residual stress. The calculation method is: Wuzhong: 53
Residual stress MPa;
——algebraic value of grid increment, mn.
-outer diameter of the front ring, mm
F——elastic radius of the ring Ma.
5.3.3 or residual stress is not enough, the case can be tempered, the temperature change should be 20~53 lower than the last tempering group of the piece (, the result of the residual strength test after the supplementary test should meet the requirements of 4.4. 5.4 Performance determination
Xiao piece scratching and plating of Niu Niu magnetic determination, except for the requirements of the practice, the result shall be carried out according to the ASTMA341 method, and a magnetic performance method tape and ruler shall be taken from the test piece to determine the equipment of each factory. 5.5 Product particle size determination
On the radial specimen of the shaft body, the bottom position of the grid is close to the sliding surface. (H6394 piece method. 5.6 Quality inspection
After the performance heat treatment, the supplier shall be along the forging Measure 4 points on the outer surface of the forging at equal distances (a total of 20 points) with reference to (Certificate 231) for rust-type speedometer or ground seat gauge to check hardness: s.7 non-destructive inspection
5.7, select powder inspection
5.7.1.1 When the party orders the parts specified in the drawings, add T-sheets and leave 2mm margins, and the surface material output R. value is 30.8m5. Pickling,
5.7.1.2 Stripping is carried out according to ASTMEK1: 5.7.1.3 If the party requires micro powder inspection, it should be in accordance with ASTMA275/A275 6
5.7.2 Ultrasonic flaw detection
JB/T8706-1908
After rough machining and heat treatment, the ultrasonic flaw detection shall be carried out according to the JB/T11 method. 5.7.3 Center hole inspection
After the surface of the center hole reaches 1.6 μm, the entire inner hole shall be inspected by a spectroscopy instrument or magnetic particle combination tester. The powder inspection shall be carried out according to ASTMA27:/A2T5M. 5.8 Testing and reheat treatment
5.8.1 If the test results do not meet the requirements, retesting is allowed. If the test results are qualified due to the following reasons, retesting is not allowed. 5 .8.3 When the test result of the sample is unqualified, two adjacent test pieces shall be selected for emergency testing. The test results of the two test pieces must be combined.
5.3 When any mechanical property test result is unqualified, the supplier may reheat the forging. Without the consent of the purchaser, the number of reheat treatments is allowed to exceed the state. The graded parts printed by the heat treatment shall be inspected according to 5.2.6 Acceptance and certificate of conformity
6.1 The purchaser shall provide the necessary means for the purchaser's inspector to conduct inspection at the purchaser's inspection point. The purchaser's inspector shall not cause unnecessary interference to the production sequence. Unless otherwise specified, all inspections shall be carried out during storage. 6.2. Generally, the inspection department of the supplier shall accept the parts according to the standard. The purchaser shall accept the parts according to this standard. 6.3 The supplier shall provide the purchaser with a certificate of conformity, including the following contents: order contract number:
a) steel number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number, steel plate number
After final acceptance: If any unacceptable defects are found during the re-inspection or processing, the party in question shall inform the purchaser immediately and both parties shall resolve the issue before the order is issued.
7 Marking and packaging
7.1 The supplier shall mark the supplier’s factory name, logo, contract number, and refining number on the lower part of each forging. 7.2 The center hole of each forging shall be coated with antiseptic and sealed with wood to prevent damage and corrosion during transportation and storage.
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