JB/T 50197-2000 Quality classification of 6MW~600MW steam turbine rotor and main shaft forgings
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T50197-2000
6MW~600MW Steam Turbine
Rotor and Main Shaft Forgings
Product Quality Grading
(Internal Use)
Published on 2000-08-31
State Machinery Industry Bureau
Implementation on 2000-12-01
JB/T50197—2000
This standard is a revision of JB/T5348694 "Product Quality Grading of Rotor and Main Shaft Forgings for 6~50MW Steam Turbines" and JB/T5350494 "Product Quality Grading of High and Medium Pressure Rotor Forgings for 100~300MW Steam Turbines". During the revision, the original standard was edited and the original JB/T53486 and JB/T53504 were merged. The technical indicators of forgings, such as chemical composition, mechanical properties, ultrasonic flaw detection, center hole inspection, magnetic powder (or pickling) inspection, etc., were appropriately adjusted and improved. This standard replaces JB/T53486-94 and JB/T53504-94 from the date of implementation. This standard was proposed and managed by Deyang Large Castings and Forgings Research Institute. The drafting unit of this standard: China Second Heavy Machinery Group Corporation. The main drafter of this standard: Zhang Mingkang.
1 Scope
Machinery Industry Standard of the People's Republic of China
6MW~600MW Steam Turbine
Rotor and Spindle Forgings
Product Quality Grading
(Internal Use)
JB/T50197—2000
Replaces JB/T53486—94
JB/T53504—94
This standard specifies the quality grade and grading technical requirements, test methods and assessment methods for 6~600MW steam turbine rotor and spindle forgings.
This standard is the basis for assessing the product quality, grade assessment, enterprise upgrading and excellence of 6~600MW steam turbine rotor and spindle forgings.
2 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. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB/T223—（1981~1997）
GB/T229—1994
GB/T231—1984
GB/T6394——1986
JB/T1265—1993
JB/T1581—1996
JB/T7025—1993
JB/T7027—1993
JB/T8707—1998
ASTMA275/A275M—1990
ASTMA370—1997
3 Technical requirements for product quality classification
3.1 Chemical composition
Steel Chemical analysis methods for iron and alloys
Methods for testing Charpy notched impact of metals
Methods for testing Brinell hardness of metals
Methods for determining average grain size of metals
Technical conditions for rotor bodies and main shaft forgings of steam turbines and steam turbine generators from 25MW to 200MWUltrasonic flaw detection methods for rotor bodies and main shaft forgings of steam turbines and steam turbine generatorsTechnical conditions for rotor bodies and main shaft forgings of steam turbines below 25MWTechnical conditions for rotor bodies and main shaft forgings of steam turbines above 300MWTechnical conditions for rotor forgings without center holes of steam turbines above 300MWMagnetic particle inspection methods for forged steel parts
Methods and definitions for testing mechanical properties of steel products3.1.1The quality classification of the main harmful elements in steel for rotors and main shaft forgings of steam turbines below 25MW shall be in accordance with the provisions of Table 1. 3.1.2The quality classification of the main harmful elements in steel for rotors and main shaft forgings of steam turbines from 25 to 200MW shall be in accordance with the provisions of Table 2. 3.1.3 The quality classification of the main harmful elements in the steel used for 300~600MW steam turbine rotor forgings shall be in accordance with the provisions of Table 3. 3.2 Mechanical properties
3.2.1 The mechanical properties of steam turbine rotors and main shaft forgings below 25MW shall be in accordance with the provisions of Table 4. Approved by the State Bureau of Machinery Industry on August 31, 2000, and implemented on December 1, 2000
JB/T50197—2000
Table 1Main harmful elements content, mass classification, chemical composition of steel for steam turbine rotors and main shaft forgings below 25MW
Qualified products
Superior products
≤0025
≤0015
≤0015
Testing time
Sampling during the pouring process
Table 2Main harmful elements content, mass classification, chemical composition of steel for steam turbine rotors and main shaft forgings from 25 to 200MW|| tt||Qualified products
First-class products
Superior products
Note: * indicates that the provisions of Table 1 of JB/T1265-1993 shall be followed. Table 3
Qualified products
First-class products
Superior products
Timing and location of sampling
Note: Sampling during the process, []
Taken from the radial test specimen of the main body
Main harmful elements content of steel for 300~600MW steam turbine rotor forgings, quality classification, chemical composition
≤0010
1* indicates that the provisions of Table 1 and Table 3 of JB/T7027-1993 shall be followed. H2
Timing and location of sampling
Sampling during the pouring process, [H]
Taken from the radial test specimen of the main body
2First-class and superior-class products require that the antimony and arsenic of 30CrIMo1V steel, and the aluminum, copper and antimony of 30G2N4MoV steel meet the specified values in Table 1 of JB/T7027-1993
JB/T50197—2000||t t||Table 4 Mechanical properties of turbine rotor and main shaft forgings below 25MW Forging strength level
Superior
Superior
Superior qualified
Superior
First-class superior
Superior qualified
Superior
620626
According to the provisions of Table 3 of JB/T7025-1993. Those not specified in the order contract shall not be used as the basis for acceptance. If the order contract stipulates, and the cold bending angle of the product also meets the provisions of Table 3, it is a first-class product or a superior product. 3.2.2 The mechanical properties of turbine rotor and main shaft forgings of 25-200MW shall be classified according to the provisions of Table 5. 3.2.The mechanical properties of 3300~600MW steam turbine rotor forgings shall be graded in accordance with the provisions of Table 4 of JB/T7027-1993. 3
02（0)
AkiAku)
FATTso
Sampling position
Longitudinal axis
Radial axis
Longitudinal axis of center hole
Longitudinal axis
Radial axis
Longitudinal axis of center hole
Longitudinal axis
Radial axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Longitudinal axis
Qualified product
≥(345)
≥ (345)
≥570
≥570
≥(31)
Superior products
≥(345)
≥(345)
（14）
≥(31)
Note: Products that meet the listed performance are qualified products
≥(352)
≥(352)
≥580
≥580
≥(14)
≥(40)
Table 525~200MW steam turbine rotor and main shaft forging Graded forging parts mechanical properties
Qualified products
≥490
≥490
≥450
≥640
≥640
≥600
≥(15)
≥(11 ) | 600
≥(15)
≥(45)
≤100
≥500
≥455
≥653
≥606
≥ 35
≤100
The intercardiac performance requirement of an electric heart is called
qualified product
≥550
≥720
≤116
≤121||t t||≥720
≥690
≤116
≤121
Premium product
Qualified product
≥734
≥734
≥ 697
≤116
≤121
≥690
≥690
≥660
≥(14||tt| |≥(12
≥(12)
≥(35
Premium product
Same as 690
≥690
≥660||t t||≥760
≥(14)
≥(12)
Those with improved performance are superior products
≥704
≥704|| tt||≥667
≥768
≥(14)
≥(12)
≥(12)
≥(50)
≥ (45)
≥ (35)
Qualified product
≥735
≥735
≥685
≥810
≥16(13)
≥16(11)
≥ 16(10)
≥45(40)
≥45(35)
≥45(35)
≥40(40)
≥40(30)
≥35(30)|| tt||≥735
≥735
≥685
≥810
≥16(13)www.bzxz.net
≥16(11)
≥16(10)
≥45 (40)
≥45(35)
≥45(35
≥40(40)
≥40(30)
35(30)
Premium product
≥750
≥750
≥690
≥818
≥16(13)
≥16(11)
≥16(10)
≥45(40)||tt ||≥45(35)
≥45(35)
≥40(40)
≥40(30)
≥35(30)
Qualified product
≥760
≥760
≥720
≥830
First-class productSuperior product
≥760
≥760
≥720
≥830
≥727
≥838
/T50197-2000
3.3 Residual stress quality classification
JB/T50197-2000
There is no such requirement for rotor bodies below 25MW. The residual stress requirements for 25~600MW rotor bodies are shown in Table 6. Table 6 Residual stress quality classification of 25~600MW rotor bodies
Qualified products, first-class products
Superior products
3.4 Ultrasonic inspection quality classification
Not more than 8% of the radial yield strength of the rotor Not more than 6% of the radial yield strength of the rotor Test location
End cutting ring or drilling strain method
3.4.1 The ultrasonic inspection quality classification of turbine rotors and main shafts below 25MW shall be in accordance with the provisions of Table 7 Table 7 Ultrasonic inspection quality classification of turbine rotors and main shafts below 25MW
Qualified products
First-class products
Superior products
1) Equivalent diameter Single scattered defects less than 2mm are not counted: 2) No part of the rotor body is allowed to have an equivalent diameter of $5mm defect, and the blade root groove is deepened by 25mm, and the transmission end bearing and other parts are not allowed to have an equivalent diameter defect greater than Φ3mm 3) There are no intensive defects greater than or equal to 2mm: 4) There are no wandering signals and continuous defect signals 1) No part of the rotor body is allowed to have an equivalent diameter of Φ4mm defect, and the blade root groove is deepened by 25mm, and the transmission end bearing and other parts are not allowed to have an equivalent diameter defect greater than @2.5mm; 2) The remaining requirements are the same as qualified products
25~200MW steam turbine rotor and main shaft ultrasonic inspection quality classification is in accordance with the provisions of Table 8 Table 825~200MW steam turbine rotor and main shaft ultrasonic inspection quality classification level|| tt||Qualified products
First-class products
Superior products
1) Individual scattered defects smaller than @2mm are not counted: to
2) No wandering signal or strip defect signal is allowed: 3) The number of allowed defects is shown in the following table
Equivalent range
Among them:
1) All three items required for qualified products must meet: to
Allowed number of defects in each part
Transmission end
Non-transmission end
Inspection part
Outer surface
Allowed number of defects
2) In the area with greater rotor stress (slot depth plus 25mm, center hole diameter plus 60mm), no equivalent diameter greater than @3. 5mm defects and dense signals exist:
3) The average attenuation coefficient of forging material should be less than or equal to 0.004dBmm1) Individual scattered defects less than Φ1.6mm are not counted;2) The total number of defects of Φ1.6~Φ3.5mm shall not exceed 30, of which: Φ1.6~3mm shall not exceed 20, Φ3~Φ3.5mm shall not exceed 10, and any defects above Φ3.5mm are not allowed:3) The wandering signal caused by defects is not allowed:4) The average attenuation coefficient of forging material should be less than or equal to 0.004dBmm5
JB/T50197-2000
3.4.3300-600MW steam turbine rotor body ultrasonic inspection quality classification shall be in accordance with the provisions of Table 9. Table 9300-600MW steam turbine rotor body ultrasonic inspection quality classification grade
Qualified product
Superior product
1) Less than $1.Single scattered defects of 6mm are not counted: Find
2) The total number of defects from Φ1.6 to Φ3.5mm shall not exceed 20, and any defects larger than Φ3.5mm are not allowed; 3) 3 defect-intensive areas smaller than Φ1.6mm are allowed at a distance of 75mm from the center hole surface, but the size of the intensive area in any direction shall not be greater than 20mm, and the distance between intensive areas shall not be less than 120mm: 4) No wandering signals and strip defect signals are allowed to fully meet the above qualified product requirements, and then the total number of defects from Φ1.6 to Φ3.5mm shall not exceed 18 to fully meet the above first-class product requirements, and then on the basis of the content of Article 3) of the qualified product requirements, only 2 defect-intensive areas smaller than Φ1.6mm are allowed
Note: Ultrasonic flaw detection of rotors without center holes above 300MW shall be in accordance with the provisions of JBT8707, and the quality grading of center hole inspection
The quality grading of rotor body and main shaft center hole inspection below 25MW shall be in accordance with the provisions of Table 10. Table 10 Quality classification of rotor body and main shaft center hole inspection below 25MW
Qualified products
Excellent products
1) The center hole surface roughness R value is 3.2um. The center hole surface is not allowed to have cracks, white spots, residual shrinkage holes, visible defects greater than 4mm in length, and non-metallic inclusions: 2) Within an area of 60cm2, the number of small defects less than 1.5mm in length shall not exceed 10; 3) The center hole surface shall not show more than 10 scattered defects with a length of 1.5~3mm, and the number of scattered defects with a length of 3-5mm shall not exceed 5:
4) Defects exceeding the above Grinding removal is allowed, and the grinding depth shall not exceed 1.6mm, and it shall have a smooth transition with the surrounding surface. Compared with the above, only item 3) is improved to 3~4mm in length. The scattered defects shall not exceed 5", and the rest are the same. The inspection quality classification of 25~600MW rotor body and main shaft center hole shall be in accordance with the provisions of Table 11. Table 1125~600MW rotor body and main shaft center hole inspection quality classification grade
Qualified products
Excellent products
1) The surface roughness R of the center hole is 1.6um;
2) The axial and circumferential positions of defects with a length greater than or equal to 15mm should be recorded , and report to the buyer: 3) In a field of view of the bore peep tester, there are not allowed to be 3 visible defects with a length greater than 1.5mm or 9 visible defects with a length less than 1.5mm:
4) The total length of all defects on the same busbar on the inner hole surface is less than 50mm5) No tear-like bifurcation defects are allowed: 6) When the distance between two defects on the same busbar is less than five times the length of the larger defect, it is treated as a continuous defect; 7) Visible defects with a length greater than 3mm and dense areas composed of non-metallic inclusions are not allowed: 8) Local grinding to eliminate defects is allowed
Same as qualified products
Item 4) in the qualified product requirements is improved here to "total length less than 40mm", and the rest are the same. 3.6 Magnetic powder (or pickling) inspection quality classification JB/T50197-2000
The magnetic powder (or pickling) inspection quality classification of rotors and spindles below 25MW shall be in accordance with JB/T7025, 25~200MW shall be in accordance with JB/T1265300-600MW shall be in accordance with the corresponding provisions in JB/T7027 and JB/T8707. 3.7 Center hole machining quality classification
3.7.1 The center hole machining quality classification of rotors and spindles below 25MW shall be in accordance with the provisions of Table 12. Table 1 225MW rotor and spindle center hole machining quality classification grade
qualified products
first-class products
excellent products
1) For rotor forgings with center holes, the center hole surface roughness R, value is 3.2um; 2) The axis line straightness tolerance value is within the same as the qualified products in the cylinder of $3mm
25~600MW rotor body and spindle center hole machining quality classification according to the provisions of Table 13. Table 1325~600MW rotor body and spindle center hole machining quality classification grade
qualified products
first-class products
excellent products Quality products
1) Surface roughness R, value is 1.6um;
2) The straightness tolerance of the center hole axis is 3mm, the roundness tolerance of the center hole is 0.3mm, and the coaxiality tolerance of the center hole and the outer circle of the forging is 1.0mm
Same as qualified products
The quality classification of metallographic inspection is in accordance with the provisions of Table 14Table 14
Metallographic inspection quality classification
Qualified products
Superior products
Inspection location
Below 25MW
In accordance with the ordering technical agreement
The average grain size is not coarser than level 4
Tangential direction of the body
The main shaft is taken from the longitudinal direction of the shaft end
25~200MW, 300-600MW
Inspection location
Center hole
Inspection location
Center hole
Average grain size 30G1Mb1V steel is not coarser than grade 2.0, other steel types are not coarser than grade 3.0 Inclusion inspection A, B, C, D four types of inclusions should not exceed grade 3.0 Shaft body motor end radial, center bar middle sampling Hardness uniformity inspection quality classification according to the provisions of Table 15 Table 15 Hardness uniformity inspection quality classification
Qualified products
Superior products| |tt||Inspection part
Below 25MW
The hardness difference between each point on the same arc surface shall not exceed 30HBS, and the hardness difference between each
point on the same axis shall not exceed 40HBS
Outer cylindrical surface (for reference)
25~200MW, 300~600MW
Same requirements as for rotors and main shafts below 25MW: Measure one point every 90° on the outer cylindrical surface of the two journals and the middle section of the shaft (12 points in total) (for reference) The machining quality classification of 6~600MW turbine rotor and main shaft forgings shall comply with the requirements of Table 16. 3.10
Qualified products
Superior products
JB/T50197—2000
Table 166~600MW steam turbine rotor and main shaft forging machining quality grading requirements
Forgings specified inspection of geometric dimensions and surface roughness items, qualified rate 80% Forgings specified inspection of geometric dimensions and surface roughness items, qualified rate 85% Forgings specified inspection of geometric dimensions and surface roughness items, qualified rate 90% 3.11: After negotiation between the supply and demand parties, the demand party agrees that a certain index can be slightly lower than the index requirements of qualified products and can be accepted, which is considered as a qualified product. 4 User evaluation and user service quality grading User evaluation and user service quality grading should comply with the provisions of Table 17. Table 17 User evaluation and user service quality classification
Qualified products
Superior products
5Test methods
1) User evaluation: The product can meet the use requirements; 2) Provide high-quality services to users
1) User evaluation: The product has good use effect and is competitive in the domestic market; 2) Frequently visit users and provide high-quality services to users1) User evaluation: The product quality is equivalent to the advanced level of similar international products; 2) Frequently visit users and provide high-quality services to users5.1 Chemical analysis shall be carried out in accordance with GB/T223 or other methods that can ensure the quality of analysis. 5.2 Mechanical properties shall be tested in accordance with the provisions of JB/T229, JB/T231, and ASTMA370. Residual stress shall be measured in accordance with the cutting ring method specified in JB/T1265 or the drilling strain method. 5.3
5.4 Ultrasonic flaw detection shall be carried out in accordance with JB/T1581. 5.5 Center hole peep inspection shall be carried out in accordance with the provisions of JB/T1265. 5.6 Magnetic particle inspection shall be carried out in accordance with the provisions of ASTMA275/A275M. Hardness inspection shall be carried out in accordance with the provisions of GB/T231. 5.7
6 Sampling method
6.1 When an enterprise conducts product quality assessment, it shall inspect each piece. 6.2 When the industry, enterprise competent departments, and quality supervision departments conduct product quality assessment, they shall randomly select 1 to 2 pieces from the forgings being manufactured or delivered by the enterprise for inspection (when sampling two pieces, the same capacity or different capacities are acceptable). 7 Testing requirements
7.1 When an enterprise conducts product quality assessment, the inspection work shall be the responsibility of the enterprise's quality inspection department, and the test method shall comply with the provisions of this standard. 7.2 When the industry, enterprise competent departments, and quality supervision departments conduct product quality assessment or inspection, the inspection method shall be determined by the above departments. 8 Assessment method
8.1 The product quality assessment of a single forging shall be in accordance with 3.1-3.10 The technical indicators specified in the regulations shall be tested and evaluated item by item, and the level conclusion of each single indicator shall be made in accordance with the quality requirements of different levels, and then a comprehensive evaluation shall be conducted to evaluate the quality level of the forging. If one item does not reach the level and can only reach a lower level, the forging shall be evaluated as the lower level. 8.2 When the industry, enterprise competent departments, and quality supervision departments conduct product quality assessment or inspection, the samples sampled shall be assessed piece by piece and handled in accordance with the provisions of 81. When assessing two pieces, their technical indicators shall all reach a certain level, and the product can be assessed as this level; when assessing three pieces, it is allowed that one product has two indicators lower than the assessed level. The quality level of the product shall be comprehensively assessed by the superior assessment department based on the results of the spot check, user evaluation opinions (Table 17) and the product quality level assessed by the enterprise's annual production volume in accordance with the provisions of 8.22. 8.2.1 When the competent departments of the industry, the enterprise, and the quality supervision department conduct product quality assessment reviews or temporary spot checks, they may conduct tests on all items or reduce the testing of certain items. 8.2.2 When assessing the grade of the enterprise's annual production volume, after each piece is assessed, 80% of the products must reach first-class quality before the product can be assessed as first-class quality. 85% of the products must reach superior quality before the product can be assessed as superior quality. 8.3 For all items inspected by the purchaser, the following situations shall be followed during the assessment. 8.3.1 When the enterprise assesses the grade of the product when it leaves the factory, this indicator may not be calculated. However, when the purchaser returns the inspection results, if they do not meet the requirements, they should be deducted from the output of the year. 8.3.2 When the competent departments of the industry, enterprises and quality supervision departments conduct inspections, the inspection items of the demand side shall be handled according to one of the following situations: a) After obtaining the inspection data of the item from the demand side, it shall be determined; b) The quality status of the product shall be determined from the opinions of the users and its grade shall be determined; c) If the demand side does not provide the inspection data of the item and there is no comprehensive evaluation information, the indicator may not be evaluated. 8.4 For the items specified in this standard, if there is no requirement in the ordering technical conditions, the enterprise may not conduct inspections, but the product quality must be guaranteed to meet the technical requirements of the corresponding grade of the item. In order to judge whether these indicators of the product can meet the relevant provisions of this standard, when the materials, process equipment have been finalized and stabilized, the method of random inspection can be adopted. That is, when the annual output does not exceed 15 pieces, 1~2 pieces shall be inspected, and when the annual output exceeds 15 pieces, 24 pieces shall be inspected. The inspection volume in the first half and the second half of the year shall be balanced. The inspection work shall be the responsibility of the comprehensive quality management department of the enterprise. For those products that are neither inspected nor inspected, the products can only be calculated as qualified products. 9
Republic
Mechanical Industry Standard
6MW~600MW Steam Turbine
Rotor and Main Shaft Forgings
Product Quality Grading
(Internal Use)
JB/T50197-2000
Published and Distributed by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing: Postal Code 100044)*| |tt||201/16 Printing sheet 3/4 Word count 20,000
Format 880×1230
First edition in November 2000
First printing in November 2000
Price 1500 yuan
Printing 1-500
No. 2000-141
Mechanical Industry Standard Service Network: http:/vwwJB.ac.cn00060 /
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