JB/T 7022-2002 Technical conditions for industrial steam turbine rotor body forgings
Some standard content:
ICS77.140.85
J32
JB
Machinery Industry Standard of the People's Republic of China
JB/T7022—2002
replaces JB/T7022—1993||tt ||Technical conditions for rotor body forgings for industrial steam turbines Specification for rotor forgings for industrial steam turbines released on 2002-12-27
Implemented on 2003-04-01
Foreword released by the National Economic and Trade Commission of the People's Republic of China,||tt ||Scope,
2
3
4
Normative reference documents
Ordering requirements
Technical requirements.||tt| |4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
Manufacturing method,
Steel type and chemical composition
Mechanical properties.
Hardness uniformity,
Non-destructive testing
Grain size and non-metallic inclusions.
FA7Tso value
Thermal stability test
High temperature mechanical properties
Test methods and inspection rules
5||tt| |5.1
5.2
5.3
5.4
5.5
5.6
Chemical analysis
Mechanical properties||tt| |Hardness uniformity..
Magnetic particle or pickling inspection
Ultrasonic inspection.
Thermal stability test.
Residual stress.
5.9|| tt||5.10
Retest.
5.11
Reheat treatment
6 Acceptance and Conformity Certificate.
7 Marking and Packaging
Table 1 Mass fraction of chemical components,
Table 2 Allowable deviations of mass fraction of chemical components Table 3 Mechanical properties,
mesh
times
JB/T7022—2002| |tt||Foreword
This standard replaces JB/T7022-1993 Technical Conditions for Industrial Steam Turbine Rotor Body Forgings. Compared with JB/T7022-1993, the main changes in this standard are as follows: Charpy impact V-type and U-type tests are clarified Sample quantity and requirements: Added the definition of "single dispersed defect"; -Added the test method for measuring residual stress by ring core resistance strain method in accordance with the provisions of JB/T8888. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of Deyang Large Casting and Forging Research Institute. This standard was drafted by: Hangzhou Industrial Steam Turbine Research Institute. The main drafters of this standard: Fang Zhangfa, Cai Linghua, Chen Wei, Zhou Mingzheng. This standard was first published in 1993.
JB/T7022-2002
1 Scope
Technical conditions for industrial steam turbine rotor body forgings JB/T70222002
Technical requirements, test methods, inspection rules, certificates and marks of alloy steel forgings.
This standard applies to the ordering, manufacturing and acceptance of industrial steam turbine rotor body forgings. 2 Normative reference documents
The provisions in the following documents become provisions of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. , For undated referenced documents, the latest version applies to this standard. GB/T222 Sample sampling method for chemical analysis of steel and allowable deviations of chemical composition of finished products GB/T223.3~78 Chemical analysis method of steel and alloys GB/T228 Metal tensile test method
GB/T229||tt ||Metal Charpy notch impact test method (GB/T229-1994, eqvISO148:1983) GB/T231
GB/T2039
GB/T6397
Metal Brinell hardness test method
Metal tensile end change and endurance test method (GB/T2039-1997, eqvISO/DIS204:1991) Metal tensile test specimen
Microscopic evaluation method of non-metallic inclusions in steel (GB /T10561-1989, eqvISO4967:1979) GB/T10561
JB/T1581
Ultrasonic flaw detection method for steam turbines, turbine generator rotors and spindle forgings JB/T8468
JB/T8888| |tt|| JB/T9021
Test methods for thermal stability of rotor forgings and determination methods for average grain size of metals
ASTMA370
Test methods and definitions for mechanical properties of steel products 3 Ordering requirements
3.1 The buyer should place an order The contract or order agreement indicates the standard, steel number, strength grade, the requirements specified by the supplier and purchaser in the provisions of this standard, and the technical requirements and inspection items other than the requirements of this standard. 3.2 The purchaser should provide the component ordering drawing indicating the sampling position of the mechanical property test and the transmission end, as well as the finishing dimensions of the blade root groove depth. 4 Technical Requirements
4.1 Manufacturing Method
4.1.1 Smelting
4.1.1.1 Steel ingots for forgings should be smelted in an electric furnace and subjected to vacuum treatment or ladle refining. 4.1.1.2 With the consent of the purchaser, other smelting methods that can ensure the requirements of this standard are allowed to be used. 4.1.1.3 High-quality raw materials should be used to ensure that the content of various inclusions in the plated parts is as low as possible. 4.1.2 Forging
4.1.2.1 The steel ingots used for forging and pressing should have sufficient removal to ensure that the finished forgings are free of harmful defects such as shrinkage holes and impermissible deviations. JB/T7022—2002
The forging equipment should have sufficient capacity to ensure that the entire section of the forging is forged through. The entire section should be fully deformed during forging to ensure uniform structure of the forging. 4.1.2.2
4.1.2.3 The end of the steel ingot with better quality should be the transmission end. The axis of the forging and the center line of the steel ingot should roughly coincide. 4.1.3 Heat treatment
4.1.3.1 Forgings need to be normalized or annealed after forging. 4.1.3.2 Forging performance heat treatment should be carried out after rough machining. 4.1.3.3 During performance heat treatment, forgings should be hung vertically for heating and cooling, and the furnace temperature and sufficient holding time should be strictly controlled to obtain uniform mechanical properties.
4.1.3.4 The tempering temperature and cooling rate of forgings should be appropriately selected. On the premise of meeting performance requirements, the tempering temperature should be increased as much as possible. After tempering, it should be cooled slowly to ensure that the residual stress of the forging is not greater than 8% of the specified lower limit of yield strength. 4.1.3.5 The metallographic structure of the forgings should be uniform, and ferrite should not appear in the center of 28CrMoNiV and 30CrMoNiV. 4.1.4 Stress removal treatment
4.1.4.1 Forgings shall be subjected to stress removal treatment by the supplier, and the temperature shall generally be within the range of 15°C to 50°C below the actual tempering temperature. 2 When the tempering cooling rate of the performance heat treatment is less than 25°C/h, stress removal treatment does not need to be performed on the premise of ensuring that the residual stress is qualified. 4.1.4.2
4.1.5 Mechanical processing
4.1.5.1 The delivered forgings shall comply with the shape, size and surface quality requirements specified in the ordering drawing. 4.1.5.2 When the supplier carries out rough machining, test specimens for acceptance by the supplier and the buyer should be left at the specified location. 4.1.5.3 In order to reduce the internal stress of forgings as much as possible, the purchaser should perform stress removal treatment again after semi-finishing. 4.1.5.4 For rotor body forgings with a center hole, the processing of the center hole should be performed before stress removal after rough machining. 4.1.6 Welding
Forgings are not allowed to be welded during the manufacturing and packaging process. 4.2
Steel type and chemical composition
4.2.1
The mass fraction of the chemical composition of steel (smelting analysis) should comply with the provisions of Table 1. Table 1
Mass fraction of chemical composition
%
Steel
No.
34CYMo1
CWww.bzxZ.net
Mn|| tt||Si
0.30~0.380.40~0.700.17~0.37
28CrMoNiV0.25~
-0.300.30~0.80
30CrMoNiV
0.28~-0.340.30
0.80||tt| |30Cr1Mo1V
0.27~0.340.70
≤0.30
0.30
1.000.20~0.35
P
≤0.020|| tt||$0.012
60.012
≤0.012
34CrNi3Mo0.30~0.400.500.800.170.37≤0.015
25CrNiMoV
0.22~0.280.300.60| |tt||30Cr2Ni4MoV
≤0.35
0.30
0.20~0.400.15~
~0.30
当电影电影脱脱oxy时，Si≤ 0.10%,4.2.2
2
0.015
≤0.012
s
Cr
Mo
≤0.0200 .70~1.200.40~0.55
$:0.022
≤0.012
≤0.012
≤0.018
≤0.018
≤ :0.012
Ni
≤0.30
V
10.25~0.35
1.[0~1.40[0.50~1.000.50~0.75 11.10~ 1.40
L05-
1.35
1.00~1.20
10.50
1.00~1.30
2.79
≤0.50| |tt||0.70~1.100.25~0.402.75~3.25
1.00~1.30|0.25~0.451.00
0.254
-0.35
0.21~0.29
1.500.05~0.15
Cu
≤0.20
$:0.20
0.20
$0.15
0.20| |tt||≤0.20
60.20
身件的成晶分用应可表表1的设计。在力学言表结极可以设计有表2表表的这些。≤.0.01||tt ||≤0.01
60.01
60.015
学法分分
正设计线
4.3
C
±0.02| |tt||力学模情
Mn
表2
>0.9
≤0.9
±0.03
±0.04||tt ||包择分分部分分的进行的设计进行Si
±0.02+0.005
身件的力学者应应方法表3的运动。s
+0.005
表3
钢号
34CrMol
28CrMoNiV
30CrMoNiV
30CriMo1V
34CrNi3Mo
25CrNiMoV
30Cr2Ni4MoV
包拿在线”
mm
≤250
<500
$900
900
≤1200||tt ||≤500
300
≤1000
≤1000
≤1200
取样位作
赦向
赦向
切向、切向
切向、切向
切向、切向
心部切向
切向
切向|| tt||切向
切向
切向
切向
织向
切向
切向、切向||tt ||心部约向
Oa.2
MPa
600~750
570~720
550~700
550~ 700
590~690
≥>550
700~850
670820
750~900
715~865||tt ||>500
≥480
≥600
≥570
≥760
≥725
C
± 0.05
720
≥690
>820
>780
≥870
≥830
≥650|| tt||620
720
≥680
860~970
≥825
维向试样应取自素家动身件端面半外外在1/3 radius. Mo
Ni
≤2.0
±0.02
5,(5,)
%
≥ 15
1
≥15
15
(≥15)
(≥15)
≥14
≥n
≥13
≥12
≥15
≥15
≥11
(≥16)||tt| |(≥16)
±0.03
>2.0
±0.07
JB/T7022—2002
%
Cu|| tt||±0.01
+0.02+0.005
Agy（Auz）
%
≥40
≥32
40| |tt||≥40
≥40
>40
40
>32
40
>30||tt| |≥40
32
≥40
>32
>45
45
J
(≥47 )
(39)
≥24
≥24
>8
7
(47)
( ≥39)
(≥47)
(≥39)
≥47
>39
≥47
39|| tt||≥41
34
FATT°s
c
≤40
≤85
≤85||tt| $116个试样单引用电影电影, one of which is allowed to be lower than the specified value, but not lower than 70% of the specified value.值均 shall not be lower than the specified value. 4.5 Non-destructive inspection
4.5.1 General requirements
Forgings are not allowed to have defects such as cracks, white spots, shrinkage holes, folding and excessive segregation, shrinkage, etc. 4.5.2 Magnetic particle or pickling inspection| |tt|| The supplier shall ensure that the magnetic particle or pickling inspection complies with the following regulations: a) The outer circular surface of the rotor is not allowed to have defects with a length greater than 1.5mm. 3 | |tt | The depth shall not exceed 1.6mm and shall have a smooth transition with the circumferential surface. 4.5.3 Ultrasonic inspection
Ultrasonic inspection shall comply with the following regulations:
a) Single scattered defects with an equivalent diameter of less than 1.6mm are not counted, but the clutter height should be less than 50% of the equivalent diameter of 1.6mm. . b) All defects with an equivalent diameter of 1.6mm~3.5mm should record their axial, radial and circumferential positions, and indicate in the certificate of conformity. The total number of defects with an equivalent diameter of 1.6mm~3.5mm shall not exceed 20, which is not allowed. Any defect with an equivalent diameter greater than 3.5mm exists.
With a central hole, the rotor body is not allowed to have dense defects with an equivalent diameter of c)
1.2mm within the range of 75mm from the center hole surface and the blade root groove depth plus 25mm. If the remaining areas are inspected If dense defects occur, the size of the dense area and its axial, radial and circumferential positions should be recorded and reported to the purchaser for review. d) When the back wave loss caused by defects exceeds 3dB, the purchaser should be reported. e) No swimming signals and continuous defect display are allowed. The supplier shall provide the buyer with the material f)
attenuation data measured by the 2MHz~2.5MHz probe at the two ends and the middle three places of the maximum diameter of the rotor body.
Defects exceeding the above requirements should be reported to the purchaser, and re-inspection and negotiation between the supplier and purchaser should be organized, but whether the forgings are available is decided by the purchaser.
Note: A single dispersed defect refers to a defect in which the distance between two adjacent defects is greater than 10 times the equivalent diameter of the larger defect. 4.5.4 Center hole
The inspection of the center hole of rotor body forgings with a center hole shall comply with the following regulations: a) Any defect showing a length greater than or equal to 1.5 mm shall be recorded in its axial and circumferential positions, and the required report shall be square. b) Three defective displays with a length greater than 1.5mm or nine defective displays with a length less than 1.5mm are not allowed within an area of ??60cm. On the entire surface, no more than 10 scattered defects with a length of 1.5mm~3mm should be displayed, and no more than 25 point defects with a length less than 1.5mm should be displayed, and chain-like distribution is not allowed. The cumulative total length of the above various defects should not be greater than 50mm.
d) No dense areas composed of visible defects and non-metallic inclusions with a length greater than 3mm are allowed. e) No tearing or bifurcation defects are allowed. f) When the distance between two defects located on the same busbar is less than five times the length of the larger defect, they will be treated as one continuous defect.
For defects that do not meet the above requirements, local grinding and polishing of the defects is allowed with the consent of the purchaser, but the depth of grinding and polishing should not exceed 1.6mm, and it should make a smooth transition with the circumferential surface. 4.6 Grain size and non-metallic inclusions
4.6.1 Grain size
When inspection of grain size is required, it should be specified in the order contract. The average grain size shall not be coarser than Grade 4. 4.6.2 Non-metallic inclusions
When inspection of non-metallic inclusions is required, it should be stated in the order contract. The four types of non-metallic inclusions A, B, C and D in forgings shall not exceed level 3.
4.7FATTso value
When the FATTs value is required to be tested, it should be stated in the order contract and the transition temperature must be specified. 4.8 Thermal stability test
Thermal stability test results should comply with the regulations of JB/T9021. 4.9 High Temperature Mechanical Properties
4.9.1 Rotor bodies of the same material, same specifications, and operating at high temperature that are produced for the first time should be tested for high temperature mechanical properties. 4
JB/T7022—2002
4.9.2 When the supplier is required to measure high-temperature mechanical properties, the sampling location and requirements should be indicated and specified in the order contract. 5 Test methods and inspection rules
5.1 Chemical analysis
5.1.1 Each furnace of molten steel should be subjected to smelting analysis. 5.1.2 The samples for finished product analysis are taken from the tangential mechanical properties samples of the plated parts. 5.1.3 The sampling method of chemical analysis samples shall be carried out in accordance with the provisions of GB/T222. 5.1.4 The chemical analysis method shall be carried out in accordance with the methods specified in GB/T223.3~78 or other methods that can ensure the quality of analysis. 5.2 Mechanical properties
5.2.1 Sample sampling
Mechanical property samples should be cut from forgings after performance heat treatment, and the sampling locations should comply with the following regulations: a) Longitudinal sample
1) For forgings with a delivery weight of less than or equal to 1, the supplier shall take one longitudinal tensile specimen and three impact specimens at any end 1/3 from the outer surface (for the U-shaped impact test, two impact specimens shall be taken, the same below) , the buyer takes samples for acceptance at the other end. 2) For forgings with a delivery weight greater than It, take one longitudinal tensile specimen and three impact specimens at each end. b) Tangential specimen
1) For forgings with a delivery weight of less than or equal to 6t, cut one tangential tensile specimen and three impact specimens from the non-drive end of the shaft body: 2) Delivery weight is greater than For a 6t forging, take one tangential tensile specimen and three impact specimens at each end of the shaft body. c) Center hole sample
The position and quantity of the center hole sample should be specified on the ordering drawing. d) Sampling method
When cutting sampling is used, double samples should be left for the silver parts, and the sample locations should be marked on the roughing drawing. When nesting or partial sawing is used for sampling, the supply and demand parties share the same section of sample. Preparation and cutting
e)
The preparation and cutting of tensile specimens should comply with the short proportion specimens specified in GB/T6397. 5.2.2 Tensile test
shall be carried out according to the method specified in GB/T228 or ASTMA370. High temperature tensile test is in accordance with GB/T2039. 5.2.3 Impact test
shall be carried out in accordance with the provisions of GB/T229.
5.3 Hardness Uniformity
Performance Check the hardness uniformity after heat treatment. According to the method specified in GB/T231, measure one point every 90° on the outer circumferential surface of the two journals and the shaft body of each forging (12 points in total), 5.4 Magnetic particle or pickling inspection
Magnetic particle or pickling inspection It should be done on the demand side. 5.4.1 Inspection location and timing
5.4.1.1 After semi-finishing, magnetic particle inspection should be carried out on the bearing parts, both end faces of the shaft body, and the transition area of ??the shaft body. Pickling inspection can also be used instead.
5.4.1.2 Carry out surface macroscopic inspection after finishing, and conduct magnetic particle inspection if necessary. 5.4.2 Inspection method
5.4.2.1 The magnetic particle inspection method shall be in accordance with JB/T8468 or other recognized methods. 5.4.2.2 Pickling inspection method: The surface roughness R of the pickled part is 1.6 μm. When pickling, first use 15% (mass fraction) ammonium persulfate aqueous solution, and then use 10% (mass fraction) nitric acid aqueous solution. , the pickling time should be no less than 15 minutes respectively. Carry out two inspections after pickling, the first inspection is 10 minutes after pickling, and the second inspection is no less than 12 hours after pickling. JB/T7022—2002
5.5 Ultrasonic inspection
5.5.1 Ultrasonic inspection should be carried out on all detectable surfaces of forgings after quenching and tempering and rough machining before grooving. 5.5.2 Forgings that need to be reheated shall be subjected to ultrasonic inspection again after reheating. 5.5.3 The ultrasonic inspection method shall be in accordance with JB/T1581. 5.6 Thermal stability test
Thermal stability test shall be conducted on the purchaser in accordance with the method specified in JB/T9021. For forgings with smaller sizes, the number of measuring tapes may be appropriately reduced. , the supplier shall be responsible for the test results.
5.7 Center hole inspection
5.7.1 For rotor body forgings with center holes, the center hole size and inner hole surface should be inspected. 5.7.2 The center hole inspection passband shall be observed with a borescope and, if necessary, magnetic particle inspection combined with a bellyscope. 5.8 Metallographic inspection
5.8.1 The sample for grain size determination is taken from the tangential sample of the body, and the inspection method is in accordance with the provisions of YB/T5148. 5.8.2 The inspection method for non-metallic inclusions shall be in accordance with the provisions of Method A of GB/T10561, and shall be evaluated using JK diagrams. 5.9 Residual stress
5.9.1 Use the cut-ring method or the ring-core resistance strain method to determine the residual stress. 5.9.2. The ring cutting method is to cut a ring with a sample size of 25mmx25mm at one end of the shaft body, and calculate the stress by measuring the average deformation of the ring before and after cutting. The calculation formula is:
aED
Medium:
0, residual stress, unit is MPa:
E--the elastic modulus of the material, the unit is MPa3-the algebraic value of the diameter increment, the unit is mmD-the outer surface of the ring before cutting Diameter, unit is mm. 5.9.3 The ring core resistance strain method shall be carried out according to the method specified in JB/T8888. 5.10 Retest
5.10.1 When the mechanical property test results do not meet the specified requirements, retest is allowed. However, if the sample fails due to white spots or cracks, it shall not be retested.
When a certain test result is unqualified due to equipment failure or poor sample preparation, samples can be taken from the adjacent position of the forging and retested. 5.10.2
5.10.3 There is one tensile test result If the requirements are not met, two supplementary specimens should be taken from the vicinity of the original specimen for tensile testing. All test results of the two specimens should meet the requirements. 5.10.4 When the chamber overflow impact value is unqualified, a group of samples (three samples for V-type impact and two samples for U-type impact) should be taken from the vicinity of the original sample for impact testing. The impact value should meet the requirements, and the average value of all samples, including the initial test sample, should also exceed the specified value, otherwise it will not be accepted. 5.11 Re-heat treatment
5.11.1 When the mechanical property test results of the forging are still unqualified, re-heat treatment is allowed and re-inspection shall be carried out according to the provisions of 5.2. 5.11.2 The number of re-heat treatment of the forging shall generally not exceed two times (referring to re-heat treatment) Itchy fire). 6 Acceptance and Conformity Certificate
6.1 The supplier shall inspect the forgings according to the items specified in this standard and the contract, and the inspection results shall comply with the regulations. The certificate of conformity should be signed by the person in charge of the supplier’s quality inspection department. 6.2 The purchaser may select certain items for re-inspection according to the inspection contents specified in this standard and the contract. When non-compliance with regulations is found during re-inspection or subsequent processing inspection, the purchaser shall promptly notify the supplier and both parties shall negotiate to resolve the issue. 6.3 The supplier shall provide necessary convenience conditions to the demand-side inspection personnel so that the demand-side inspection personnel can conduct on-site acceptance work, 6
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