JB/T 8705-1998 Technical requirements for rotor forgings without center hole for steam turbine generators below 500MW
Some standard content:
JCS 77.140.85
Machinery Industry Standard of the People's Republic of China
JB/T8705--.1998
Specification of the noncentral hote rotorsforgings used below 5oMW turbine generator1998-03-19Promulgated by the Ministry of Machinery Industry of the People's Republic of China
Implemented on 1998-07-01
JB/T TS
This standard is proposed by the Ministry of Machinery Industry. The drafting positions of this standard are: Qihar Forging Research Institute and Harbin Daliangkai Research Institute. The main authors of this standard are Li Zheng, Guo Chenghai, Yang Xinfa and Jin Luoyu.1 Scope
Standard of Machinery Industry of the People's Republic of China
Specialties of central hale rotorsForgings ised hclnw SoMW turbine generator IE/T87051998
This standard strictly regulates the technical requirements, inspection rules, test methods, individual certificates and international standards for rotor forgings without center hole of steam turbine generators above 2W and below 52MW.
This standard is applicable to the manufacture and inspection of technical materials for steam turbine generators below MW. 2 Referenced Standards The above standards contain the provisions of the standards, which are used as the text of this standard by citing them in the vehicle standard. All versions of this standard are valid at the time of publication. All international standards agencies dare to revise and use this standard. The parties should discuss the possibility of using the following standards to limit the new version of the establishment GR 233-H4 GB223 (82) B 228-&2 G0: T 334-04 GBel et 6S-18R JB/T 158 46
Chemical analysis of sample taking and chemical analysis of sample price difference of iron alloy subjected to external impact test method
Jinrun Baoshen test method
Hai Pin Ke Bi impact test method
National standard test method
National standard test point method
Steam turbine, steam turbine generator and forging steel parts forging powder inspection method
A$TMA275/A3TM-9
ASTM A3I1-ES
3 Ordering requirements
High current impact test method 3.1 The purchaser shall specify the standard to be purchased, the grade of the part, the technical requirements of the steel wire scanning degree, and other test items in the order contract and technical cooperation agreement.
The carbon number of the silver part should be marked under the upper part of the drawing: Steel grade
Grade*Catalyst number of this standard
3.2 The purchaser should provide a detailed drawing of a dummy rotor without a center hole indicating the sampling position of the test specimen before scientific performance testing. 4 Technical requirements
4.1 Forging
41.1 Forgings shall be smelted in a forming furnace. Other storage methods are allowed. Vacuum treatment shall be used as much as possible. Approved by the Ministry of Machinery and Heat Industry on March 19, 1998Www.bzxZ.net
1-0 Test bottle
+.1.2 Forging
4.1.2.1
JB/TRT05--1998
There shall be sufficient removal at the upper and lower ends of the forging system to ensure that the forging is free of shrinkage cavities and unacceptable segregation. 4.1.2.2 Forging should be done on a machine with a minimum age, so that the entire part can be fully moved and the center of the chain should roughly overlap, and the steel pressure rat should be used at one end when the turbine end is cold. 4.1.3 Heat treatment
The final heat treatment is normalizing and tempering.
4. 1.3. 1
4.1.32 The heat treatment is quenching and tempering. If the purchaser agrees, quenching and tempering treatment is allowed. Performance heat treatment should be carried out in the state of self-processing as much as possible
4.1.4 Machined
Forgings sent by the supplier shall meet the roughness and size requirements specified in the acoustic inspection drawings. 4.2 Chemical analysis
The analysis of the forged parts shall comply with the provisions of Table 1. 4.2.1
Chemical composition
J. 32--0. 4U. bt~. 89 2. J7 -3. 3: u, U36012.~0.590.51~0.N93?0.7
-1L-Mt:1A 34~-0. 3X 5. 4--D. T, (17--u. 3r3cNl: 3t~0. 4o5.s..s, 1r t.a3 rNVe. 31,-~. 2 -~3. .
:1. 17.. 37
*rViMnV 2. r.~.0. 281n.3n-.n. 5Gn. 11~.p. 27,
n, 4n-..n. 55
1. 71.301. 7G6. 30--0. 30
n, 35~ \, 40
: The vacuum breaking method is not more than 10, f
t, 25..i,J1
c5u. tb sc.2
43.2 When the finished product is decomposed after being dispatched, its chemical composition shall comply with the provisions of Table 1, including the allowable constants in Table 2. The maximum chemical composition in Table 2 is calculated with deviations. 21--..4
The maximum diameter of the bucket in the assembly section
251--410
411--570
571--516
4.3 Chemical properties
The chemical properties of the parts shall comply with the provisions of Table 3. Sampling position
Axis end longitudinal
Axis Wearing direction
Axis change to longitudinal direction
Axis porridge
Axis radial direction
Axis mouth longitudinal direction
Axis tooth tangential direction
Axis diameter
Body diameter
Body section
Standard: The value of the middle item is the minimum,
4.4 Residual stress
JB/T8705199%||t t||Table: Mechanical properties
4CNe:1A
GrNive
I4CrNiiMn
2sCrNiMnV
Supply and demand should be designed according to the environment. The surplus should be checked. The error should be small. The person in charge should pay attention to the service point. 4.5 Pickling or magnetic particle inspection
4.5.1 The buyer shall carry out pickling inspection on both ends of the forging. There shall be no cracks, self-pitting, heavy skin and other defects. :
4CrN:1Mn
:4CrN.3Mn
CrNMuV
4.5.3 The material grade shall be in cm2 area. The length of the single end depression shall be 1mm and the number shall not exceed 5. The length of the single defect below 1.53 shall not exceed? Each bearing part shall not have more than 5 defects. If the defects specified above are found, the parties shall negotiate and deal with them.
Note: 25cm is the area with the longest length of 15cm. The defect length is based on the flow. 4.6 Ultrasonic inspection
Forgings shall be inspected by ultrasonic operation on the external measuring surface, and the inspection results shall meet the following requirements. 4.6.1 Cracks, cavities and shrinkage holes are not allowed. 4.6.2 Defects with a diameter less than 2mm are not allowed. 4.3 Continuous defect signals and dynamic signals are allowed. 4.4 Defects with a diameter less than 4 or more than 2.cm are not allowed in the range of 1mm.
3R/T8T051998
4.6.5 No single defect with a diameter greater than 4mm is allowed within the 25m depth of the outer circle grid. In other areas, single defects with a diameter of 2~mn1 are allowed. However, the distance between two adjacent defects shall not be less than times the diameter of the larger defect. 4.6 The total number of single defects in forgings shall not exceed 56. 4.6.7 When using 2~2.5MHz for flaw detection, the material variation coefficient shall be less than or equal to 14d/m7 center hole
4.7.1 After the final heat treatment, the center of the fine money is required, and the surface is polished by a method that does not increase the defects. The bottom of the surface is 3.um, the hole bottom should be too dark, 42 use a plastic mirror to check the inner surface, the inner surface is not allowed to be single, the remaining part of the box hole and the length of more than 5mm before the defects and the small defects of the area are as follows: 1) The number of small defects with a length of 0.5.~1.5mm. on the center area of 6rm is not allowed to exceed 10! b) The maximum depression of 1.5-3mm is 3~5mm in length, and the number of points is not allowed to exceed 10: 1) The entire center square hole surface is ten, and the length of the point test case is 6~1.6mm. The number of points is not allowed to exceed 11 and the defects of early town distribution are not allowed.
4.7.3 According to the large defects, local correction can be made (using sharp grinding method to make the final correction depth less than 10.5. After receiving the general requirements, the center of the forging shall be drawn separately.
4.8 Hardness
After heat treatment, the hardness shall be measured to check its uniformity and properties. The hardness values are only considered together, and the degree of deviation is determined as follows: the shaft diameter and the shaft part are separated by 9 measuring points (a total of 12 points). The 4 points are pressed together to form a degree of difference, which is more than 40 units of hardness, and the axial direction of the forging should not exceed 40 units of hardness. 4.4 Micro performance
The performance should not be lower than the following requirements: 2.5*101 A/m
10. 0× 1r'A/a
15.G×10*A/m
20. tX19 A/m
EC.CX10 A/m
4.10 Surface quality
Forging surface shall be free of cracks, folds, and other defects that affect the straightness of the quality and other defects that seriously affect the performance of the parts. The indicated parts shall be removed, and the depth of removal shall not exceed the residual area of fine processing. 4.11 Straightness
The tolerance value of the center hole straightness is .5n:m/m. 5 Inspection rules and test methods
5.1 Chemical analysis
5.1:1 The chemical analysis and sampling method shall be carried out in accordance with G222. The chemical analysis method shall be carried out in accordance with GB223. 5.1.1 The finished product analysis sample is taken from the chemical properties of the parts. 5.2 Mechanical properties test 5.2.1 Forging mechanical properties test 5.2.1.1 Tangential test 5.2.1.2 ... For forgings, take samples at 1/2 of the center of the forging, and take samples at 1/3 of the diameter of the hole. 5.2.1.3 Diameter test piece
Take two light tensile test pieces according to the requirements of the drawing. The two ends can be separated by a small distance of 1 meter from each other. Cut the whole length of the forging on the intermediate ring.
5.2.2 The tensile test shall be carried out in accordance with the provisions of GB226. According to the provisions of GH6397, the minimum diameter of the test piece with a self-correction of 1 cm and a gauge length of 5 is adopted. The diameter of the test piece can be mm, and the gauge length is 5 of the true diameter. The impact test shall be carried out in accordance with the provisions of GB/T22. The test piece is 10mm×10mmXFEmm. The test piece is:
5 .3 The residual force test should be carried out by cutting ring method or ring resistance strain test. 5.3! The mechanical properties test of the ring method can be carried out by taking a ring with a diameter of 25mm and 25m, and using the average deformation of the rolling ring before and after cutting to calculate the elastic residual force. The formula for calculating the residual force is:
Formula: Residual force.MP
… The substitute value of the self-increment
—The lifting modulus of the outer m
E of the cutting ring, MFa
When the residual force is not appropriate, the tempering temperature should be higher than the tempering temperature of the piece after the tempering: 5.4 Lu Xi said that the bridge grabbing point
5. 4.1 Acid inspection
Pickling control check surface roughness: fire %m, acid flow time 15 grams of vegetable nuclear safety, then use 1C% code acid concentrated alcohol, after washing, carry out two inspections, the first inspection car pickling piece 1Cmir, the second stewing after washing not more than 12h5.4.2 Age inspection according to 1STMA275.
5.S ultra-production wave detection transmission according to JT/T581. 5.6 Magnetic properties test according to GB231. Use cloth people hardness more chain meter F chain meter to carry out 5.7 Magnetic properties
The buyer shall determine the performance of the parts sent to the standard. Except for those that need to be determined, the A5TMA11 method shall be used. The magnetic properties of each section of the shaft through the tangential test ring shall be determined by the inch connection of each "design". 5.8.1 When the performance test results of the supplier are in compliance with the specified requirements, retesting is allowed. 5.8.2 If a test result is found to be in compliance with the specified requirements, 7 test trays shall be placed adjacent to the flow test column for retesting. However, if the test result is unqualified, no test shall be conducted. The test results of the two test samples shall meet the specified requirements. 5.3 If the forging result is still unqualified, the supplier may re-treat the forging, but not more than 2 times: excluding the tempering times; the forging after the re-treating shall be submitted for acceptance as a new forging. 6 Acceptance and Certificate of Qualification
6.1 The supplier's inspection department shall inspect the forgings according to the standards, and the inspection tools shall meet the specified technical requirements. 6.2 After the acceptance of the supplier, if the defects allowed by the buyer are found in the re-test of the forging, they shall be returned. 6 Forgings should be accompanied by the following certificates of conformity: a) approval number b) order drawing number; d) roasting furnace number; d) standard number and forging grade; d) roasting furnace number; d) delivery requirements; d) delivery in the desired state. 7 Marking and packaging JH/T8705-1998 The supplier shall stamp the manufacturer's name or logo, including question mark, on the lower end face of each forging, and the furnace guide and the center of each forging shall be sealed with wood to prevent damage or leakage during transportation and storage. Certificate: 7.22 Longitudinal test specimens
Take 2 intermediate test specimens and 2 impact test specimens from both sides of the forging. For forgings with center, take samples at 1/2 of the center, and for forgings without center, take samples at 1/3 of the diameter. 5.2.1.3 Diameter test specimens
Take 2 light tensile test specimens according to the requirements of the drawing. The specimens can be cut from the intermediate ring at a distance of 1 cm from both ends.
5.2.2 The tensile test is carried out in accordance with the provisions of GB226. According to the provisions of GH6397, the specimen with a minimum diameter of 1 cm and a gauge length of 5 is used. The diameter of the diameter specimen can be mm, and the gauge length is 5 of the true diameter. Impact test shall be carried out in accordance with GB/T22. 5.3 Residual force test shall be carried out by practical ring cutting method or ring resistance strain test. 5.3! For mechanical property test of ring method, a ring with a diameter of 25 mm or more and a diameter of 25 m can be taken, and the residual force shall be calculated based on the mean square deformation before and after rolling ring cutting.
The calculation formula of residual stress is as follows:
Formula: residual stress.MP
…The value of the self-increment
—the outer m of the cutting ring
E material grain lifting modulus, MFa
When the residual stress is not appropriate, the temperature should be supplemented with a tempering temperature higher than the temperature of the piece after the first tempering: 5.4 Lu washing said the bridge grab point
5. 4.1 Acid inspection
Acid pickling control check surface roughness: fire %m, acid flow time 15 grams of vegetable core, then use 1C% acid concentrated alcohol, after washing, carry out two inspections, the first inspection car pickling piece 1Cmir, the second inspection after washing not more than 12h5.4.2 Age inspection according to 1STMA275.
5.S Super production wave detection transmission JT/T581 for. 5.6 The test of the magnetic properties shall be carried out in accordance with GB231. The test shall be carried out with a chain-type magnetic meter. 5.7 Magnetic properties The customer shall carry out the performance test of the parts to be delivered. Except for the test parts that require visual inspection, the A5TMA11 method shall be used. The magnetic properties of each part shall be determined by the tangential test ring. 5.8.1 When the test results of the magnetic properties meet the requirements, a retest is allowed. 5.8.2 If one of the forgings fails the test, 7 test trays shall be placed adjacent to the flow test column for retest. However, if the internal white spot and cracking effect is unqualified, no spot test shall be performed. Please collect 2 test specimens for retest. The test must meet the requirements of the meeting. 5.3 If the forging still fails the test, the supplier may re-treat the forging, but not more than 2 times: excluding the tempering times; the forging after re-treating shall be submitted for acceptance as a new forging. 6 Acceptance and certificate of conformity
6.1 The supplier's inspection department shall inspect the forgings in accordance with the standards, and the inspection tools shall meet the technical requirements specified in the competition. 6.2 After the supplier's acceptance, if the defects allowed by the purchaser are found during the re-test, they shall be returned. 6 Forgings should be accompanied by the following certificates of conformity: a) approval number b) order drawing number; d) roasting furnace number; d) standard number and forging grade; d) roasting furnace number; d) delivery requirements; d) delivery in the desired state. 7 Marking and packaging JH/T8705-1998 The supplier shall stamp the manufacturer's name or logo, including question mark, on the lower end face of each forging, and the furnace guide and the center of each forging shall be sealed with wood to prevent damage or leakage during transportation and storage. Certificate: 7.22 Longitudinal test specimens
Take 2 intermediate test specimens and 2 impact test specimens from both sides of the forging. For forgings with center, take samples at 1/2 of the center, and for forgings without center, take samples at 1/3 of the diameter. 5.2.1.3 Diameter test specimens
Take 2 light tensile test specimens according to the requirements of the drawing. The specimens can be cut from the intermediate ring at a distance of 1 cm from both ends.
5.2.2 The tensile test is carried out in accordance with the provisions of GB226. According to the provisions of GH6397, the specimen with a minimum diameter of 1 cm and a gauge length of 5 is used. The diameter of the diameter specimen can be mm, and the gauge length is 5 of the true diameter. Impact test shall be carried out in accordance with GB/T22. 5.3 Residual force test shall be carried out by practical ring cutting method or ring resistance strain test. 5.3! For mechanical property test of ring method, a ring with a diameter of 25 mm or more and a diameter of 25 m can be taken, and the residual force shall be calculated based on the mean square deformation before and after rolling ring cutting.
The calculation formula of residual stress is as follows:
Formula: residual stress.MP
…The value of the self-increment
—the outer m of the cutting ring
E material grain lifting modulus, MFa
When the residual stress is not appropriate, the temperature should be supplemented with a tempering temperature higher than the temperature of the piece after the first tempering: 5.4 Lu washing said the bridge grab point
5. 4.1 Acid inspection
Acid pickling control check surface roughness: fire %m, acid flow time 15 grams of vegetable core, then use 1C% acid concentrated alcohol, after washing, carry out two inspections, the first inspection car pickling piece 1Cmir, the second inspection after washing not more than 12h5.4.2 Age inspection according to 1STMA275.
5.S Super production wave detection transmission JT/T581 for. 5.6 The test of the magnetic properties shall be carried out in accordance with GB231. The test shall be carried out with a chain-type magnetic meter. 5.7 Magnetic properties The customer shall carry out the performance test of the parts to be delivered. Except for the test parts that require visual inspection, the A5TMA11 method shall be used. The magnetic properties of each part shall be determined by the tangential test ring. 5.8.1 When the test results of the magnetic properties meet the requirements, a retest is allowed. 5.8.2 If one of the forgings fails the test, 7 test trays shall be placed adjacent to the flow test column for retest. However, if the internal white spot and cracking effect is unqualified, no spot test shall be performed. Please collect 2 test specimens for retest. The test must meet the requirements of the meeting. 5.3 If the forging still fails the test, the supplier may re-treat the forging, but not more than 2 times: excluding the tempering times; the forging after re-treating shall be submitted for acceptance as a new forging. 6 Acceptance and certificate of conformity
6.1 The supplier's inspection department shall inspect the forgings in accordance with the standards, and the inspection tools shall meet the technical requirements specified in the competition. 6.2 After the supplier's acceptance, if the defects allowed by the purchaser are found during the re-test, they shall be returned. 6 Forgings should be accompanied by the following certificates of conformity: a) approval number b) order drawing number; d) standard number and forging grade d) roasting furnace number; d) delivery requirements; d) delivery hot state. 7 Marking and packaging JH/T8705-1998 The supplier should stamp the manufacturer's name or logo, including question mark, on the lower end face of each forging, and the furnace guide and the center of each forging should be sealed with wood to avoid damage or leakage during transportation and storage. Certificate: 7.2
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