JB/T 50196-2000 Quality classification of alloy steel forgings for non-magnetic retaining rings of 3MW~600MW generators
Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T50196-2000
3MW600MW generator
Non-magnetic retaining ring alloy steel forgings
Product quality classification
(internal use)
Published on 2000-08-31
State Machinery Industry Bureau
Implementation on 2000-12-01
JB/T50196—2000
This standard is a revision of JB/T53491-94 "Product Quality Classification of Non-magnetic Retaining Ring Alloy Steel Forgings for 3~50MW Generators" and JB/T5349794 "Product Quality Classification of Non-magnetic Retaining Ring Alloy Steel Forgings for 100~300MW Generators". During the revision, the original standard was edited and some technical indicators were changed in accordance with the corresponding provisions of JB/T7029-1993 "Technical Conditions for Non-magnetic Guard Ring Forgings of Steam Turbine Generators Below 50MW", JB/T1268-1993 "Technical Conditions for Non-magnetic Guard Ring Forgings of Steam Turbine Generators 50~200MW" and JB/T7030-1993 "Technical Conditions for Non-magnetic Guard Ring Forgings of Steam Turbine Generators 300~600MW". This standard replaces JB/T53491-94 and JB/T53497-94 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: Chen Dajin.
1 Scope
Machinery Industry Standard of the People's Republic of China
3MW~600MW Generator
Non-magnetic retaining ring alloy steel forgings
Product quality classification
(Internal use)
JB/T50196—2000
Replaces JB/T53491—94
JB/T53497—94
This standard specifies the quality grade and classification technical requirements, test methods and assessment methods for non-magnetic retaining ring alloy steel forgings of 3~600MW generators.
This standard is the basis for assessing the product quality, grade assessment, enterprise upgrading and quality product determination of non-magnetic retaining ring alloy steel forgings of 3~600MW generators.
2 Cited 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. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T223—（1981~1997）
GB/T228—1987
GB/T4338—1995
GB/T 6394—1986
JB/T1268—1993
JB/T4010—1985
JB/T7029—1993
JB/T70301993
ASTMA342—1979
3 Technical requirements for product quality classification
3.1 Chemical composition
Chemical analysis methods for steel and alloys
Metal tensile test methods
High-temperature tensile test methods for metallic materials
Metal Method for determination of average grain size
Technical conditions for non-magnetic retaining ring forgings of 50-200MW steam turbine generatorsUltrasonic flaw detection method for steel retaining rings for steam turbine generatorsTechnical conditions for non-magnetic retaining ring forgings of steam turbine generators below 50MWTechnical conditions for non-magnetic retaining ring forgings of 300~600MW steam turbine generatorsMethod for determination of magnetic permeability of weak magnetic materials
Chemical composition of steel for forgingsQualified products and first-class products shall comply with the corresponding provisions in Table 1 of JBT7029-1993, JB/T1268-1993 and JB/T703C-1993 respectively. The phosphorus and sulfur contents of superior products shall comply with the provisions in Table 1 of this standard. 3.2 Mechanical properties
The mechanical properties of forgings shall conform to the requirements of Table 2Approved by the State Bureau of Machinery Industry on August 31, 2000, and implemented on December 1, 2000
50Mh18Cr5
50Mh18G5N
50Mnl8Cr4WN
1Mnl8Cr18N
3~50MW
50-200MW
Qualified products
Superior products
Qualified products
First-class products
Superior products
Qualified products||tt ||First-class product
Superior product
Qualified product
First-class product
Superior product
Qualified product
Superior product
Qualified product
First-class product
Superior product
Qualified product
First-class product
Superior product
Qualified product
First-class product
Superior product
JB/T50196—2000
Table 1 Chemical composition
≤0050
≤0040
Table 2 Mechanical properties
Test location
Sampling during pouring
Test location
Cut
2 tensile test
samples (Φ10mm) at the relative position of the ring at 1/2 wall thickness of the extended end
Cut
2 tensile test
samples (Φ12.5mm) at the relative position of the ring at 1/2 wall thickness of the extended end, and take 2 impact test specimens at the relative position of the inner ring
300-600MW
Qualified products
Superior products
Qualified products
Superior products||t t||Qualified products
Superior products
JB/T50196—2000
Table 2 (end)
Test location
Cut
4 tensile test samples (Φ12.5mm) at the relative position of the ring at 1/2 wall thickness of the extended end, and take
4 impact test samples from the inner ring, the position is in accordance with the
delivery drawing
Note: The tensile test temperature of 1Mh18Cr18N steel is 95~105℃C, and the impact test temperature is 20~27℃, on the same test ring of the retaining ring above 300MW. !
3.3 Residual stress
002 The fluctuation value does not exceed 50MPa
The residual stress of the forging shall comply with the provisions of Table 3. 300~600MW is not specified and can be implemented according to the agreement between the supply and demand parties. Table 3 Residual stress
3~200MW
3.4 Stress corrosion
Qualified products
First-class products
Superior products
Not exceeding 20% of the specified yield strength
3.4.1300~600MW retaining ring When the demander makes a request, stress corrosion inspection should be carried out. 3.4.2 The time for stress corrosion cracking to appear should be greater than or equal to 1000h. 3.5 Grain size
The grain size of forgings shall conform to the provisions of Table 4
Table 4 Grain size
Qualified products
Superior products
No requirements for products below 50MW, above 50MW, Grade 1
Grade 1 or finer
Same grade products
Test location
Cut the ring at 1/2 wall thickness of the extended end
Test location
Take from any part of the extended end or on the test ring
3.6 Non-destructive testing
JB/T50196—2000
In addition to complying with the corresponding provisions of JB/T7029, JB/T1268 and JB/T7030, the non-destructive testing results of forgings shall also comply with the provisions of Table 5.
Table 5 Ultrasonic test results
3-600MW
3.7 Magnetic permeability
Qualified products
First-class products
Superior products
The magnetic permeability of forgings shall comply with the provisions of Table 6. Grade
Qualified products
Superior products
Conform to the standards
≤3
Table 6 Magnetic permeability
Test location
Number of defects of equivalent diameter within any 100mm wide full circumference during longitudinal wave flaw detection
Test location
3~200MW: When the magnetic field strength is 1.6x10°A/m, the magnetic permeability of the forging should not be greater than 13.8x107Hm: 3.00~600MW: When the magnetic field strength is 0.8x10°A/m, the magnetic permeability of the forging should not be greater than 13.2×10H/m3.8 Machining quality
One sample is cut from the ring and the forgings shipped by the buyer must be machined to the size and surface roughness indicated on the buyer's drawing, which should generally comply with the provisions of Table 7. Table 7 Machining quality
Qualified products
First-class products
Superior productswwW.bzxz.Net
4 Notes
For forgings delivered by rough processing, the total qualified rate of the geometric dimensions and surface roughness items specified for inspection shall not be less than 80%For forgings delivered by rough processing, the total qualified rate of the geometric dimensions and surface roughness items specified for inspection shall not be less than 85%For forgings delivered by rough processing, the total qualified rate of the geometric dimensions and surface roughness items specified for inspection shall not be less than 90%After negotiation between the supply and demand parties, any product that the buyer recognizes that a certain indicator is slightly lower than the qualified product requirement and can be accepted is a qualified product. 5 User evaluation and user service
User evaluation and user service shall be evaluated in accordance with the provisions of Table 8. 4
Qualified products
First-class products
Superior products
6 Test methods
6.1 Chemical composition
JB/T50196-2000
Table 8 User evaluation and user service
1) User evaluation The product can meet the needs of use; 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 users 1) 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 users Chemical composition analysis methods shall comply with the provisions of GB/T23. 6.2 Mechanical properties
Mechanical properties inspection shall be carried out in accordance with the provisions of GB/T228 and GB/T4338. Sampling location and quantity shall comply with the provisions of JB/T7029, JB/T1268 and JB/T7030.
6.3 Residual stress
The determination method of residual stress shall be in accordance with the provisions of JB/T1268. 6.4 Grain size
The test method of grain size shall be in accordance with the provisions of GB/T6394. 6.5 Ultrasonic flaw detection
Ultrasonic testing shall be carried out in accordance with the provisions of JB/T4010. 6.6 Magnetic permeability
The test method of magnetic permeability shall be in accordance with the provisions of ASTMA342. 7 Sampling method
7.1 When an enterprise conducts product quality assessment, it shall conduct inspection piece by piece. 7.2 When the industry, enterprise competent departments, and quality supervision departments conduct product quality assessment or inspection, they shall randomly select two or three pieces (including different capacities) from the forgings being produced or delivered for inspection by the enterprise for inspection. Inspection requirements
8.1 When an enterprise conducts product quality assessment, the inspection work shall be the responsibility of the enterprise's quality inspection department. The test method shall comply with the provisions of this standard.
8.2 When the competent departments of the industry, enterprises and quality supervision departments conduct product quality assessment or inspection, the inspection methods shall be decided by these departments.
9 Assessment method
9.1 The product quality assessment of a single forging adopts the method of reaching all indicators, that is, the grade conclusions of all individual quality indicators of the forging must reach a certain grade before the forging can be assessed as this grade. Otherwise, the grade of the forging can only be assessed according to the lowest grade that can be achieved in each individual quality indicator.
JB/T50196—2000
9.2 When the competent departments of the industry, enterprises and quality supervision departments conduct product quality assessment or inspection, the products sampled shall be assessed piece by piece and handled in accordance with the provisions of 9.1. When assessing two pieces, both pieces shall reach a certain grade before the product can be assessed as this grade; when assessing three pieces, it is allowed that one of the indicators of one product is lower than the grade assessed by the hand (except for non-destructive testing in 3.6). The product quality grade should be comprehensively assessed by the superior assessment department based on the sampling results and user evaluation opinions. The assessment results of each product produced by the enterprise throughout the year should also be considered. Only when 80% of the products reach the first-class level can the product be assessed as a first-class product; only when 85% of the products reach the superior level can the product be assessed as a superior level. 9.3 When the industry, enterprise competent departments, and quality supervision departments conduct product quality assessment reviews or temporary spot checks, they can test all items or reduce the testing of certain items.
9.4 All items inspected by the purchaser will be handled according to different situations during the assessment. 9.4.1 When the enterprise assesses the grade of the product when it leaves the factory, it can not calculate this indicator, but when the purchaser returns the inspection results, if it does not meet the requirements, it should be deducted from the output of the year. 9.4.2 When the competent departments of the industry, enterprises and quality supervision departments conduct inspections, their inspection data shall be handled according to one of the following situations: a) After obtaining the inspection data of the item from the purchaser, the assessment shall be made; b) The quality status of the product shall be judged from the user's opinions and its grade shall be determined; c) If the purchaser does not provide the inspection data of the item and there is no comprehensive judgment information, the index may not be calculated. 9.5 For the items specified in this standard, if there is no requirement in the ordering conditions, the enterprise may not conduct inspections, but as a technical requirement for grading, it must be guaranteed to be achieved. In order to assess whether the indicators can be achieved, when the materials, processes and equipment have been finalized and stable and there are no principled changes, the enterprise may adopt the method of random inspection. For all untested items, 2~3 items shall be randomly inspected when the output does not exceed 30 pieces in half a year, and 35 items shall be randomly inspected when the product exceeds 30 pieces. The random inspection work shall be the responsibility of the enterprise's quality management department. All items that are not randomly inspected or not tested can only be calculated as qualified products. 6
Republic
Mechanical Industry Standard
3MW~600MW Generator
Non-magnetic Guard Ring Alloy Steel Forgings
Product Quality Grading
(Internal Use)
JB/T50196-2000
Published and Distributed by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing, Postal Code 1 00044)*
Format 880×12301/16 Printing sheet 3/4 Number of characters 14.000First edition in November 2000
First printing in November 2000
Price 1500 yuan
Printing 1-500
Number 2000-140
Mechanical Industry Standard Service Network: http:/vwwJB.ac.cn009601 When an enterprise conducts product quality assessment, the inspection work shall be the responsibility of the enterprise's quality inspection department. The test method shall comply with the provisions of this standard.
8.2 When the industry, enterprise competent departments, and quality supervision departments conduct product quality assessment or inspection, the inspection method shall be decided by these departments.
9 Assessment method
9.1 The product quality assessment of a single forging adopts the method of reaching all indicators, that is, the grade conclusion of each single quality indicator of the forging must reach a certain grade before the forging can be rated as this grade. Otherwise, the grade of the forging can only be assessed according to the lowest grade that can be achieved in each single quality indicator.
JB/T50196—2000
9.2 When the industry, enterprise competent departments, and quality supervision departments conduct product quality assessment or inspection, the sampled products shall be assessed piece by piece and handled in accordance with the provisions of 9.1. When two items are assessed, both items must reach a certain level before the product can be rated as this level; when three items are assessed, it is allowed that one indicator of one product is lower than the level assessed by the operator (except for non-destructive testing in 3.6). The level of product quality should be comprehensively assessed by the superior assessment department based on the sampling results and user evaluation opinions. The results of the piece-by-piece assessment of the company's products produced throughout the year should also be considered. Only when 80% of the products reach the first-class level can the product be rated as a first-class product; only when 85% of the products reach the superior level can the product be rated as a superior product. 9.3 When the industry, enterprise competent departments, and quality supervision departments conduct product quality assessment reviews or temporary spot checks, they can test all items or reduce the testing of certain items.
9.4 All items inspected by the purchaser shall be handled according to different situations during the assessment. 9.4.1 When the company assesses the level of the product when it leaves the factory, it can not calculate this indicator, but when the purchaser returns the inspection results, if it does not meet the requirements, it should be deducted from the output of the year. 9.4.2 When the competent departments of the industry, enterprises and quality supervision departments conduct inspections, their inspection data shall be handled according to one of the following situations: a) After obtaining the inspection data of the item from the purchaser, the assessment shall be made; b) The quality status of the product shall be judged from the user's opinions and its grade shall be determined; c) If the purchaser does not provide the inspection data of the item and there is no comprehensive judgment information, the index may not be calculated. 9.5 For the items specified in this standard, if there is no requirement in the ordering conditions, the enterprise may not conduct inspections, but as a technical requirement for grading, it must be guaranteed to be achieved. In order to assess whether the indicators can be achieved, when the materials, processes and equipment have been finalized and stable and there are no principled changes, the enterprise may adopt the method of random inspection. For all untested items, 2~3 items shall be randomly inspected when the output does not exceed 30 pieces in half a year, and 35 items shall be randomly inspected when the product exceeds 30 pieces. The random inspection work shall be the responsibility of the enterprise's quality management department. All items that are not randomly inspected or not tested can only be calculated as qualified products. 6
Republic
Mechanical Industry Standard
3MW~600MW Generator
Non-magnetic Guard Ring Alloy Steel Forgings
Product Quality Grading
(Internal Use)
JB/T50196-2000
Published and Distributed by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing, Postal Code 1 00044)*
Format 880×12301/16 Printing sheet 3/4 Number of characters 14.000First edition in November 2000
First printing in November 2000
Price 1500 yuan
Printing 1-500
Number 2000-140
Mechanical Industry Standard Service Network: http:/vwwJB.ac.cn009601 When an enterprise conducts product quality assessment, the inspection work shall be the responsibility of the enterprise's quality inspection department. The test method shall comply with the provisions of this standard.
8.2 When the industry, enterprise competent departments, and quality supervision departments conduct product quality assessment or inspection, the inspection method shall be decided by these departments.
9 Assessment method
9.1 The product quality assessment of a single forging adopts the method of reaching all indicators, that is, the grade conclusion of each single quality indicator of the forging must reach a certain grade before the forging can be rated as this grade. Otherwise, the grade of the forging can only be assessed according to the lowest grade that can be achieved in each single quality indicator.
JB/T50196—2000
9.2 When the industry, enterprise competent departments, and quality supervision departments conduct product quality assessment or inspection, the sampled products shall be assessed piece by piece and handled in accordance with the provisions of 9.1. When two items are assessed, both items must reach a certain level before the product can be rated as this level; when three items are assessed, it is allowed that one indicator of one product is lower than the level assessed by the operator (except for non-destructive testing in 3.6). The level of product quality should be comprehensively assessed by the superior assessment department based on the sampling results and user evaluation opinions. The results of the piece-by-piece assessment of the company's products produced throughout the year should also be considered. Only when 80% of the products reach the first-class level can the product be rated as a first-class product; only when 85% of the products reach the superior level can the product be rated as a superior product. 9.3 When the industry, enterprise competent departments, and quality supervision departments conduct product quality assessment reviews or temporary spot checks, they can test all items or reduce the testing of certain items.
9.4 All items inspected by the purchaser shall be handled according to different situations during the assessment. 9.4.1 When the company assesses the level of the product when it leaves the factory, it can not calculate this indicator, but when the purchaser returns the inspection results, if it does not meet the requirements, it should be deducted from the output of the year. 9.4.2 When the competent departments of the industry, enterprises and quality supervision departments conduct inspections, their inspection data shall be handled according to one of the following situations: a) After obtaining the inspection data of the item from the purchaser, the assessment shall be made; b) The quality status of the product shall be judged from the user's opinions and its grade shall be determined; c) If the purchaser does not provide the inspection data of the item and there is no comprehensive judgment information, the index may not be calculated. 9.5 For the items specified in this standard, if there is no requirement in the ordering conditions, the enterprise may not conduct inspections, but as a technical requirement for grading, it must be guaranteed to be achieved. In order to assess whether the indicators can be achieved, when the materials, processes and equipment have been finalized and stable and there are no principled changes, the enterprise may adopt the method of random inspection. For all untested items, 2~3 items shall be randomly inspected when the output does not exceed 30 pieces in half a year, and 35 items shall be randomly inspected when the product exceeds 30 pieces. The random inspection work shall be the responsibility of the enterprise's quality management department. All items that are not randomly inspected or not tested can only be calculated as qualified products. 6
Republic
Mechanical Industry Standard
3MW~600MW Generator
Non-magnetic Guard Ring Alloy Steel Forgings
Product Quality Grading
(Internal Use)
JB/T50196-2000
Published and Distributed by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2, Shouti South Road, Beijing, Postal Code 1 00044)*
Format 880×12301/16 Printing sheet 3/4 Number of characters 14.000First edition in November 2000
First printing in November 2000
Price 1500 yuan
Printing 1-500
Number 2000-140
Mechanical Industry Standard Service Network: http:/vwwJB.ac.cn00960
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