JB/T 53507-1998 300~600MW Steam Turbine Cylinder Casting Product Quality Classification JB/T53507-1998 Standard Download Decompression Password: www.bzxz.net

ICS 77. 140. 80
Machinery Industry Standard of the People's Republic of China
JB/T53507-1998
300～600MW Steam Turbine Cylinder Steel Castings
Product Quality Grading
(Internal Use)
Published on 1998-03-19
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1998-07-01
JB/T53507—1998
This standard is revised based on JB/T5350794 "Quality Grading of 300-600MW Steam Turbine Cylinder Steel Castings" (internal use) and combined with JB/T702493 "Technical Conditions for 300～600MW Steam Turbine Cylinder Steel Castings". In terms of technical content, such as chemical composition, mechanical properties, surface quality, dimensional tolerance, etc., the indicators have been modified and supplemented: the rough machining quality classification, machining allowance classification, inspection methods, etc. have been deleted, and the actual content in JB/T53507-94 has been retained. This standard will replace JB/T53507-94 from the date of entry into force. This standard was proposed and managed by the Deyang Large Castings and Forgings Research Institute of the Ministry of Machinery Industry. The drafting unit of this standard: Second Heavy Machinery Group Corporation. The main drafters of this standard: Ying Zaitian, Gong Shilin, Ke Binghua. 1
1 Scope
Machinery Industry Standard of the People's Republic of China
300-600MW Steam Turbine Cylinder Castings
Product Quality Grading
(Internal Use)
JB/T53507-1998
Replaces JB/T53507-94
This standard specifies the quality grade, grading technical requirements, inspection methods and assessment methods for 300-600MW steam turbine cylinder castings (hereinafter referred to as castings).
This standard is the basis for assessing the product quality, grade assessment, enterprise upgrading and excellence of 300-600MW steam turbine cylinder castings. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest version of the following standards. GB222—84
GB223—（82~94)
GB 228-—87
GB/T229—94
GB3323—87
GB 6060.185
GB6414—86
JB/T702493
ZBK54039—90
3 Technical requirements for product quality classification
Chemical composition
Sampling method for chemical analysis of steel and allowable deviation of finished product analysis Chemical analysis method for steel and alloys
Metal tensile test method
Metal Charpy notched impact test method
Radiography and quality classification of steel fusion welded butt joints Surface roughness comparison of sample casting surface
Casting size tolerance
300600MW steam turbine cylinder casting technical conditions Technical conditions for repair welding of steam turbine castings| |tt||The chemical composition quality classification of castings shall be in accordance with the provisions of Table 1Table 1 Chemical composition quality classification
Qualified products
First-class products
Superior products
3.2 Mechanical properties
≤0025
≤0015
The mechanical properties quality classification of castings shall be in accordance with the provisions of Table 2Approved by the Ministry of Machinery Industry on March 19, 1998
Sampling location
Melt analysis
Implemented on July 1, 1998
3.3 Dimension tolerance quality classification
JB/T53507—1998
3.3.1 The dimensional tolerance quality classification of castings shall be in accordance with the provisions of Table 3. 3.3.2
The rough machining dimensions of castings shall be in accordance with the provisions of Table 4, and the quality classification of the wall thickness and rib thickness tolerances of castings shall be in accordance with the provisions of Table 5. Table 2
2 Mechanical properties quality classification
02 or.
ZGI5CrIMoA
(ZG15Gr1Mo)
ZG15CrIMoIV
ZGl5C2MolbzxZ.net
Qualified products
First-class products
Superior products
Qualified products
First-class products
Superior products
Qualified products
First-class products
Superior products
Qualified products
First-class products
Superior products
Table 3 Tolerance classification of rough casting dimensions
1 The tolerance values ​​in the table are CT15 grade in GB6414-86. 2 The tolerance values ​​in the table are tolerance bands.
Test part
Main specimen
3 When the qualified rate of the specified inspection size is 80%, it is a qualified product; when the qualified rate is 85%, it is a first-class product; when the qualified rate is 90%, it is a superior product. Table 4 Rough machining dimension tolerance classification
Qualified products
First-class products
Superior products
≤125
Note: The total cumulative dimension tolerance should not exceed the total dimension tolerance 2
Rough machining dimension mm
>125~600
Qualified products
First-class products
Superior products
JB/T53507—1998
Table 5 Casting wall thickness, rib thickness tolerance quality classification basis
>40~63
>63~100
1. The tolerance values ​​in the table are CT16 grade in GB6414-86. 2 The tolerance values ​​in the table are tolerance bands
3.4 ​​Surface quality classification
Surface quality classification shall be carried out in accordance with the provisions of Table 6. Table 6 Surface quality classification Qualified products First-class products Superior products Appearance inspection quality >160~250 >250~400 Surface roughness Processing surface Meets 4.42.2 44.2.5, 4.4.2.6 of JBT7024-93 , 4.42.7 provisions of non-destructive testing quality grading
Magnetic particle testing quality grading shall be carried out in accordance with the provisions of Table 7 to reach or exceed R6.3um
Table 7 Magnetic particle testing quality grading
Qualified products
First-class products
Superior products
The testing results shall comply with the provisions of Appendix B of JB/T7024-93 or meet the requirements after grinding and welding
Ultrasonic testing quality grading shall be carried out in accordance with the provisions of Table 8. 3.5.2
Table 8 Ultrasonic testing quality grading
Qualified products
Superior products
The testing results shall comply with the provisions of Appendix C of JBT7024-93 or meet the requirements after re-testing after shoveling and welding
Radiographic testing quality grading shall be carried out in accordance with the provisions of Table 9. >400~630
Non-machined surface
Reach or better than R100um
Reach or better than R50μm
Reach or better than R12.5m
Test location
According to the provisions of the flaw detection drawing
Test location
According to the provisions of the flaw detection drawing
Qualified products
Superior products
JB/T53507—1998
Table 99
Radiographic flaw detection quality grading
In accordance with the provisions of GB3323 or in accordance with the provisions of Appendix D of JBT7024-93, or qualified after re-inspection after scraping and repairing
3.6 Repair welding quality grading
The repair welding quality grading of castings shall be carried out in accordance with the provisions of Table 10. Table 10: Casting repair welding quality classification
Qualified products
Excellent products
Comply with the provisions of ZBK54039, magnetic particle inspection and ultrasonic inspection are qualified Test location
According to the provisions of the inspection drawing
Test location
Comply with the provisions of ZBK54039, magnetic particle inspection and ultrasonic inspection are qualified, and the weld has no obvious bite marks. Comply with the provisions of ZBK54039, and the weld has no obvious bite marks. 4 User evaluation and user service
User evaluation and user service quality classification shall be carried out according to the provisions of Table 11. Table 11 User evaluation and user service quality classification
Qualified products
Excellent products
5.Sampling method
①User evaluation: The product can meet the use requirements
②Provide high-quality services to users and deal with problems in a timely manner
①User evaluation: The product has good use effect and is competitive in the domestic market②Visit users frequently, provide users with high-quality services and improve work quality according to user opinions①User evaluation: The product quality is equivalent to the advanced level of similar international products and can enter the international market②Visit users frequently and provide users with high-quality services5.1When the enterprise conducts product quality assessment, it should check each piece. Welding area
5.2When the industry competent department, quality supervision department or the enterprise itself conducts product quality assessment or inspection, it should conduct random inspection and inspection under the delivery state. For those with an annual production volume of less than 16 pieces, 1 to 2 pieces shall be sampled, and for those with an annual production volume of more than 16 pieces, 3 to 5 pieces shall be sampled. 6 Testing requirements
6.1When the enterprise conducts product quality assessment, the inspection work shall be the responsibility of the enterprise's quality inspection department. 6.2 When the competent departments of the industry and the quality supervision departments conduct product quality assessment or inspection, the testing unit shall be determined by the above departments. 7 Assessment method
7.1 The quality assessment of a single casting shall be carried out item by item according to the technical indicators specified in Chapter 3, and the grading conclusion of each indicator shall be made according to the grade requirements specified in this standard. Then a comprehensive assessment shall be carried out to evaluate the quality grade of the product. Among the specified technical indicators, the casting can only be evaluated as a certain grade when all indicators reach a certain grade. If one item does not reach the grade, the casting shall be evaluated as a lower grade.
7.2 When the competent departments of the industry, enterprises and the quality supervision departments conduct product quality assessment and inspection, they shall inspect and evaluate the sampled castings one by one and conduct a comprehensive assessment according to the provisions of 7.1. When assessing the stability of casting production quality, sampling inspections shall be carried out in stages and batches according to the provisions of 7.1. When two items are sampled for assessment, all of their indicators must reach a certain level before the product can be rated at that level; when three items are assessed, except for 3.2 and 3.4, which must reach a certain level, among the remaining single indicators, one product is allowed to have two indicators lower than the rated level. The product quality level should be comprehensively assessed by the superior assessment department based on the results of the random inspection and taking into account the user's assessment opinions. During the comprehensive assessment, the piece-by-piece assessment of the company's annual production should also be considered. Only when 80% of the annual production reaches 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. 5
Republic
Mechanical Industry Standard
300~600MW Steam Turbine Cylinder Castings
Product Quality Grading
(Internal Use)
JB/T53507—1998
Published and Distributed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (No. 2 Shouti South Road, Beijing, Postal Code 100044)*
2 Number of Words 12000
Format 880X1230
1/16 Sheet 1/2
First Edition in June 1998
First Printing in June 1998
Print Quantity 00,001—500
Cost 10.00 Yuan
98-022
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