JB/T 7030-2002 Technical Specifications for Non-magnetic Guard Ring Forgings for 300MW~600MW Steam Turbine Generators
Some standard content:
ICS77.140.85
Machinery Industry Standard of the People's Republic of China
JB/T7030—2002
Replaces JB/T7030—1993
Specification for nonmagnetic retaining ring forgings for 300MW～600MW steam turbine generators for300MWto600MWturbinegenerators2002-12-27 Issued
2003-04-01 Implementation
The State Economic and Trade Commission of the People's Republic of China Issued Foreword
1 Scope
2 Normative references
Ordering requirements,
Technical requirements
Chemical composition
Mechanical properties,
Magnetic properties.
Grain size..
Non-destructive testing
Stress corrosion test
Dimensions and surface roughness
Inspection rules and test methods
Chemical composition analysis,|| tt||Mechanical properties test
Grain size determination
Ultrasonic test.
Liquid penetrant test
Magnetic permeability determination..
Stress corrosion test
Acceptance and certificate of conformity
Marking and packaging
Figure 1 Sampling location,
Table 1 Mass fraction of chemical composition
Table 2 Mechanical properties,
Table 3 Number of specimens,
JB/T7030—2002
JB/T7030—2002
This standard replaces JB/T7030-1993 "Technical Conditions for Non-magnetic Retaining Ring Forgings for 300~600MW Steam Turbine Generators". Compared with JB/T7030-1993, the main changes of this standard are as follows: The overall arrangement and structure of the standard are modified according to GB/T1.1-2000 "Guidelines for Standardization Work Part 1: Structure and Writing Rules of Standards";
- The chemical composition of 1Mn18Cr18N steel in 4.2 is changed to N≥0.45% according to the provisions of Westinghouse PDS10725BM-BSRevPGBU0297/07/17: The data in Table 2 of mechanical properties in 4.3.1 are revised according to the provisions of Westinghouse PDS10725BM-BSRevPGBU0297/07/17:
The errors in the original text are modified.
This standard is proposed by China Machinery Industry Federation. This standard is under the jurisdiction of Deyang Large Castings and Forgings Research Institute. The drafting units of this standard are Harbin Large Electric Motor Research Institute and Dongfang Electric Motor Co., Ltd. The main drafters of this standard are: Wang Huiting, Li Wenjun, Zhao Hongming, Guo Chenghai, Xuan Pinfan. This standard was first issued in 1993.
1 Scope
JB/T7030—2002
Technical conditions for non-magnetic retaining ring forgings of 300MW-600MW steam turbine generators This standard specifies the technical requirements, test methods, certificates of conformity and marks, etc. for non-magnetic retaining ring forgings of 300MW-600MW steam turbine generators.
This standard applies to the ordering, production and inspection of non-magnetic retaining ring forgings of 300MW-600MW steam turbine generators. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For all dated references, all subsequent amendments (excluding errata) or revisions are not applicable 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 any undated referenced document, its latest version shall apply to this standard. GB/T223.3~78 Chemical analysis methods for steel and alloys GB/T4338-1995 High temperature tensile test for metallic materials (eqvISO738:1989) JB/T4010—1985 Ultrasonic flaw detection method for steel retaining ring for steam turbine generator (eqvASTMA531-1974) YB/T5148-1993 Determination of average grain size of metals (eqvASTME112:1981) ASTMA342—1995 Determination of magnetic permeability of weakly magnetic materials ASTMA370-1997 Test methods and definitions for mechanical properties of steel products ASTME165—1995
Liquid penetrant test method
3 Ordering requirements
3.1 The purchaser shall specify the adopted standards, the grade of forgings, the steel grade, the corresponding technical requirements and inspection items, and other additional instructions in the order contract or technical agreement.
3.2 When placing an order, the purchaser must provide the supplier with a rough machining drawing (finishing dimensions if necessary), and the sample position should also be marked on the drawing and marked as follows:
Forging grade × number of this standard
4 Technical requirements
4.1 Manufacturing
4.1.1 Refining
Steel for forgings should be smelted in an electric furnace and an electroslag remelting furnace. 4.1.2 Head and tail cutting
The upper and lower ends of the steel ingot for forgings should be sufficiently cut off to ensure that the forgings have no shrinkage cavities and unacceptable segregation. 4.1.3 Forging
4.1.3.1 Forging should be carried out on a forging press with sufficient capacity to ensure that the entire cross section of the forging is fully forged. 4.1.3.2 Deformation strengthening should be carried out at room temperature or slightly above room temperature using appropriate strengthening methods, such as die expansion and hydraulic bulging methods. 4.1.4 Heat treatment
4.1.4.1 Forgings shall be subjected to solution treatment after hot forming and before deformation strengthening. 4.1.4.2 Forgings shall be subjected to stress relief treatment after deformation strengthening. 1
JB/T7030——2002
4.1.4.3 The stress relief annealing process shall be heated to 330℃～355℃ at a rate of no more than 40℃/h, maintained at this temperature for 10h～12h, and then cooled at a rate of no more than 40℃/h to ensure dimensional stability. 4.1.5 Machining
4.1.5.1 Forgings shall be subjected to rough machining before deformation strengthening. 4.1.5.2 Forgings shipped must be machined to the size and surface roughness indicated on the purchaser's drawings. 4.2 Chemical composition
The mass fraction of the chemical composition of steel for forgings shall comply with the provisions of Table 1. Table 1
Mass fraction of chemical composition
1Mn18Cr18N
0121750~2000
4.3 Mechanical properties
≤0015
17.50~20 00≤0 030
The mechanical properties of forgings shall conform to the requirements of Table 2. N
>047≤0.001
Table 2 Mechanical properties
002MPa
Test temperature℃
≥970
970~1100
≥1030
1030~1170
≥>53
sBiSnPbSb
Analysis reference
≥1070
1070~1210
≥>52
When measuring 0b, 002, 54, w, it is 95~105: when measuring Akv, it is 20~274.3.2 On the same test ring, the fluctuation value of the measured results of tensile strength or yield strength should not exceed 50MPa. 4.4 Magnetic properties
When the magnetic field strength is (0.8×10*)A/m, the magnetic permeability shall not be greater than (13.2X10~7)H/m. 4.5 Grain size
The grain size of forgings shall be Grade 1 or better than Grade 1 as specified in YB/T51481993. 4.6 Nondestructive testing
4.6.1 General requirements
Forgings shall be free of cracks, strip inclusions, folds and other defects that affect use. Local surface defects may be removed, and the removal depth shall not exceed 75% of the finishing allowance.
4.6.2 Liquid penetrant inspection
Should be carried out on all surfaces of each retaining ring. 4.6.2.1
The requirements for liquid penetrant inspection are as follows:
The surface should not show any defects (local defects can be handled according to 4.6.1) a)
The surface of the forging after fine processing, the buyer shall conduct liquid penetrant inspection, and the result is that the entire fine processing surface of the guard ring is not allowed to have any defects b)
. Individual defects can be locally polished with the consent of the buyer's design personnel. c)
4.6.3 Ultrasonic flaw detection inspection
Each forging shall be subjected to ultrasonic flaw detection inspection, and the entire outer circle shall be inspected by transverse wave and longitudinal wave, and the two end faces shall be inspected by longitudinal wave. The requirements for ultrasonic inspection are as follows:
When inspecting by transverse wave, no defect signal exceeding 1/2 reference line is allowed. JB/T7030—2002
b) Within any full circumference of 100mm width, there shall be no more than eight defect signals between 1/2 reference line and 1/4 reference line, and the distance between any two adjacent defects shall not be less than 50mm. When the defect signals exceed eight, records shall be made for negotiation. Rings whose V-groove reflection signals cannot be distinguished from the noise level due to the coarse grains or microstructure of the forging shall be rejected. c)
d) When inspecting by longitudinal wave, no defects larger than 2mm in equivalent diameter are allowed, and no more than four defects with equivalent diameters of 1.6mm~2mm are allowed within any full circumference of 100mm width.
When the bottom wave of the defective part is compared with that of the intact part of the material, the guard ring with a bottom wave drop greater than 6dB shall be rejected. 4.7 Stress corrosion test
4.7.1 When the purchaser makes a request, a stress corrosion test shall be carried out. 4.7.2 The test time that causes stress corrosion cracking to appear shall be greater than or equal to 1000h. 4.8 Dimensions and surface roughness
The dimensions, tolerances and surface roughness of forgings shall comply with the provisions of the order drawings. 5 Inspection rules and test methods
5.1 Chemical composition analysis
5.1.1 The supplier shall conduct smelting analysis on each furnace of molten steel to determine the percentage of the elements specified in Table 1. The sample shall be taken out when the molten steel is poured. When electroslag remelting is used, the smelting composition of the parent material shall prevail. 51.2 When the purchaser conducts a review analysis of the finished product, the sample shall be taken from any point at 1/2 of the wall thickness of the extended section of the forging, or from the mechanical properties sample.
5.1.3 Chemical composition analysis shall be carried out in accordance with GB/T223 and related analysis methods. 5.2 Mechanical properties test
Mechanical properties test shall be carried out in accordance with ASTMA370-1997 and with reference to GB/T4338-1995. 5.2.1 Performance specimens shall be cut after deformation strengthening and stress relief treatment. 5.2.2 Sampling position and quantity:
5.2.2.1 According to the forging order drawing, both the supplier and the buyer shall cut a test ring on the extension section at one end of the forging for testing. The sampling position shall be in accordance with Figure 1 and the order drawing.
Test extension is divided into
H Tangential tensile
a Tangential punching
Magnetic permeability car test sample
Figure 1 Sampling position
JB/T7030—2002
5.2.2.2 The number of test samples shall be in accordance with the provisions of Table 3 and the ordering drawing. Table 3 Number of test samples
Unit name
Test sample location
Test sample type
Magnetic permeability
Magnetic permeability
Number of test samples (pieces)
5.2.3 Retest:
If the mechanical property test results do not meet the requirements, it is allowed to take the adjacent two test samples for retest. If the test fails due to cracks, retest is not allowed. If one test sample still fails in the retest, the forging shall not be used. 53 Grain size determination
53.1 The inspection method shall be carried out in accordance with YB/T5148-1993. 53.2 The grain size sample shall be taken from the mechanical properties test ring and measured on the radial-longitudinal section. 54 Ultrasonic inspection
Forging ultrasonic flaw detection shall be carried out in accordance with JB/T4010-1985, and 1/4 standard line shall be added during shear wave flaw detection. 5.5 Liquid penetrant inspection
Liquid penetrant inspection shall be carried out in accordance with ASTME165-1995. 5.6 Magnetic permeability determination
The supplier and the buyer shall each take samples in accordance with ASTMA342-1995. 5.7 Stress corrosion test
5.7.1 Test conditions:
Bending stress 590MPa
Magic corrosion medium 36%Ca(NO)2+3%NH4NO3+61%H2OTest temperature Room temperature
5.7.2 The test specimens shall be taken at the relative position close to the inner side of the ring, and two specimens shall be taken in total. The test adopts the four-point bending fixed deformation method, and the stress must be loaded on the convex surface of the ring.
6 Acceptance and certificate of conformity
6.1 The forgings shall be accepted by the supplier's quality inspection department in accordance with this standard, and the buyer shall re-inspect in accordance with this standard. 6.2 The supplier shall provide the buyer's inspector with necessary convenient conditions so that the inspector can carry out his work. The buyer's factory inspector shall not cause unnecessary obstruction to the supplier's production. Unless otherwise specified, all inspections shall be carried out at the supplier (except for the review and analysis test). 6.3 The supplier shall provide the buyer with a certificate of conformity when the forgings leave the factory. The certificate of conformity shall report the following items: contract number, melting furnace number, standard number, order forging drawing number and grade number: a)
Melting analysis results;
Mechanical properties test results;
Grain size grade:
Stress corrosion test results:
Magnetic permeability measurement results;
Liquid penetrant inspection and ultrasonic inspection results, including defect distribution diagram: Solution treatment and stress relief tempering temperature, holding time and strengthening method. JB/T7030—2002
6.4 After the forgings are accepted by the supplier, if the buyer finds unacceptable defects during the re-inspection and processing of the buyer, the buyer shall promptly notify the supplier and the two parties shall negotiate to resolve.
7 Marking and Packaging
The supplier shall mark the supplier's factory name or logo, order contract number, order drawing number, melting furnace number and forging 7.1
card number on the nozzle end face of each forging.
7.2 The surface of the forging shall be fully coated with rust inhibitor to prevent corrosion during transportation. 7.3 The packaging and shipment shall avoid damage to the forgings when they are transported to the purchaser. 5
People's Republic of China
Mechanical Industry Standard
300MW~600MW Steam Turbine Generator Non-magnetic
Technical Conditions for Guard Ring Forgings
JB/T7030—2002
Published and distributed by Machinery Industry Press
No. 22 Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mm×1240mm1/160.75 Printing Sheet·15,000 Words2 1st edition, 1st printing, April 2003
Price: 12.00 yuan
Book number: 15111·7197
Website: http://www.cmpbook.comEditorial office phone:
(010)88379779
Direct sales center phone:
(010)88379693
All books without anti-counterfeiting label on the cover are pirated
Copyright reserved
Infringements will be investigated1 According to the forging order drawing, the supplier and the buyer shall each cut a test ring from the extended section at one end of the forging for testing. The sampling position shall be in accordance with Figure 1 and the requirements of the order drawing.
Test extension is divided into
H Tangential tensile
a Tangential punching
Magnetic permeability car test sample
Figure 1 Sampling position
JB/T7030—2002
5.2.2.2 The number of test samples shall be in accordance with the provisions of Table 3 and the ordering drawing. Table 3 Number of test samples
Unit name
Test sample location
Test sample type
Magnetic permeability
Magnetic permeability
Number of test samples (pieces)
5.2.3 Retest:
If the mechanical property test results do not meet the requirements, it is allowed to take the adjacent two test samples for retest. If the test fails due to cracks, retest is not allowed. If one test sample still fails in the retest, the forging shall not be used. 53 Grain size determination
53.1 The inspection method shall be carried out in accordance with YB/T5148-1993. 53.2 The grain size sample shall be taken from the mechanical properties test ring and measured on the radial-longitudinal section. 54 Ultrasonic inspection
Forging ultrasonic flaw detection shall be carried out in accordance with JB/T4010-1985, and 1/4 standard line shall be added during shear wave flaw detection. 5.5 Liquid penetrant inspection
Liquid penetrant inspection shall be carried out in accordance with ASTME165-1995. 5.6 Magnetic permeability determination
The supplier and the buyer shall each take samples in accordance with ASTMA342-1995. 5.7 Stress corrosion test
5.7.1 Test conditions:
Bending stress 590MPa
Magic corrosion medium 36%Ca(NO)2+3%NH4NO3+61%H2OTest temperature Room temperature
5.7.2 The test specimens shall be taken at the relative position close to the inner side of the ring, and two specimens shall be taken in total. The test adopts the four-point bending fixed deformation method, and the stress must be loaded on the convex surface of the ring.
6 Acceptance and certificate of conformity
6.1 The forgings shall be accepted by the supplier's quality inspection department in accordance with this standard, and the buyer shall re-inspect in accordance with this standard. 6.2 The supplier shall provide the buyer's inspector with necessary convenient conditions to facilitate the inspector's work. The buyer's factory inspector shall not cause unnecessary obstruction to the supplier's production. Unless otherwise specified, all inspections shall be carried out at the supplier (except for the review and analysis test). 6.3 The supplier shall provide the buyer with a certificate of conformity when the forgings leave the factory. The certificate of conformity shall report the following items: contract number, melting furnace number, standard number, order forging drawing number and grade number: a)
Melting analysis results;
Mechanical properties test results;
Grain size grade:
Stress corrosion test results: bZxz.net
Magnetic permeability measurement results;
Liquid penetrant inspection and ultrasonic inspection results, including defect distribution diagram: Solution treatment and stress relief tempering temperature, holding time and strengthening method. JB/T7030—2002
6.4 After the forgings are accepted by the supplier, if the buyer finds unacceptable defects during the re-inspection and processing of the buyer, the buyer shall promptly notify the supplier and the two parties shall negotiate to resolve.
7 Marking and Packaging
The supplier shall mark the supplier's factory name or logo, order contract number, order drawing number, melting furnace number and forging 7.1
card number on the nozzle end face of each forging.
7.2 The surface of the forging shall be fully coated with rust inhibitor to prevent corrosion during transportation. 7.3 The packaging and shipment shall avoid damage to the forgings when they are transported to the purchaser. 5
People's Republic of China
Mechanical Industry Standard
300MW~600MW Steam Turbine Generator Non-magnetic
Technical Conditions for Guard Ring Forgings
JB/T7030—2002
Published and distributed by Machinery Industry Press
No. 22 Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mm×1240mm1/160.75 Printing Sheet·15,000 Words2 1st edition, 1st printing, April 2003
Price: 12.00 yuan
Book number: 15111·7197
Website: http://www.cmpbook.comEditorial office phone:
(010)88379779
Direct sales center phone:
(010)88379693
All books without anti-counterfeiting label on the cover are pirated
Copyright reserved
Infringements will be investigated1 According to the forging order drawing, the supplier and the buyer shall each cut a test ring from the extended section at one end of the forging for testing. The sampling position shall be in accordance with Figure 1 and the requirements of the order drawing.
Test extension is divided into
H Tangential tensile
a Tangential punching
Magnetic permeability car test sample
Figure 1 Sampling position
JB/T7030—2002
5.2.2.2 The number of test samples shall be in accordance with the provisions of Table 3 and the ordering drawing. Table 3 Number of test samples
Unit name
Test sample location
Test sample type
Magnetic permeability
Magnetic permeability
Number of test samples (pieces)
5.2.3 Retest:
If the mechanical property test results do not meet the requirements, it is allowed to take the adjacent two test samples for retest. If the test fails due to cracks, retest is not allowed. If one test sample still fails in the retest, the forging shall not be used. 53 Grain size determination
53.1 The inspection method shall be carried out in accordance with YB/T5148-1993. 53.2 The grain size sample shall be taken from the mechanical properties test ring and measured on the radial-longitudinal section. 54 Ultrasonic inspection
Forging ultrasonic flaw detection shall be carried out in accordance with JB/T4010-1985, and 1/4 standard line shall be added during shear wave flaw detection. 5.5 Liquid penetrant inspection
Liquid penetrant inspection shall be carried out in accordance with ASTME165-1995. 5.6 Magnetic permeability determination
The supplier and the buyer shall each take samples in accordance with ASTMA342-1995. 5.7 Stress corrosion test
5.7.1 Test conditions:
Bending stress 590MPa
Magic corrosion medium 36%Ca(NO)2+3%NH4NO3+61%H2OTest temperature Room temperature
5.7.2 The test specimens shall be taken at the relative position close to the inner side of the ring, and two specimens shall be taken in total. The test adopts the four-point bending fixed deformation method, and the stress must be loaded on the convex surface of the ring.
6 Acceptance and certificate of conformity
6.1 The forgings shall be accepted by the supplier's quality inspection department in accordance with this standard, and the buyer shall re-inspect in accordance with this standard. 6.2 The supplier shall provide the buyer's inspector with necessary convenient conditions so that the inspector can carry out his work. The buyer's factory inspector shall not cause unnecessary obstruction to the supplier's production. Unless otherwise specified, all inspections shall be carried out at the supplier (except for the review and analysis test). 6.3 The supplier shall provide the buyer with a certificate of conformity when the forgings leave the factory. The certificate of conformity shall report the following items: contract number, melting furnace number, standard number, order forging drawing number and grade number: a)
Melting analysis results;
Mechanical properties test results;
Grain size grade:
Stress corrosion test results:
Magnetic permeability measurement results;
Liquid penetrant inspection and ultrasonic inspection results, including defect distribution diagram: Solution treatment and stress relief tempering temperature, holding time and strengthening method. JB/T7030—2002
6.4 After the forgings are accepted by the supplier, if the buyer finds unacceptable defects during the re-inspection and processing of the buyer, the buyer shall promptly notify the supplier and the two parties shall negotiate to resolve.
7 Marking and Packaging
The supplier shall mark the supplier's factory name or logo, order contract number, order drawing number, melting furnace number and forging 7.1
card number on the nozzle end face of each forging.
7.2 The surface of the forging shall be fully coated with rust inhibitor to prevent corrosion during transportation. 7.3 The packaging and shipment shall avoid damage to the forgings when they are transported to the purchaser. 5
People's Republic of China
Mechanical Industry Standard
300MW~600MW Steam Turbine Generator Non-magnetic
Technical Conditions for Guard Ring Forgings
JB/T7030—2002
Published and distributed by Machinery Industry Press
No. 22 Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mm×1240mm1/160.75 Printing Sheet·15,000 Words2 1st edition, 1st printing, April 2003
Price: 12.00 yuan
Book number: 15111·7197
Website: http://www.cmpbook.comEditorial office phone:
(010)88379779
Direct sales center phone:
(010)88379693
All books without anti-counterfeiting label on the cover are pirated
Copyright reserved
Infringements will be investigatedcom editorial department phone number:
(010)88379779
Direct sales center phone number:
(010)88379693
All covers without anti-counterfeiting labels are pirated
Copyright reserved
Infringements will be investigatedcom editorial department phone number:
(010)88379779
Direct sales center phone number:
(010)88379693
All covers without anti-counterfeiting labels are pirated
Copyright reserved
Infringements will be investigated
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