This standard specifies the technical conditions, test methods and inspection rules for die-forged stationary blade blanks for steam turbines. This standard applies to die-forged stationary blade blanks for steam turbines. JB/T 3073.1-1991 Technical conditions for die-forged moving and stationary blades and hot-rolled stationary blade blanks for steam turbines Die-forged stationary blade blanks JB/T3073.1-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T3073.1
Orbital Science
1991-07-01
Zhang Xianji
1992-07-01
Jiang Jia Kui Lu Wa Yi Xian
Hong Cancer
This standard specifies the technical specifications, test methods and inspection rules for the die-forged stationary blades of steam turbines. This standard is applicable to the die-forged stationary blades of steam turbines. Reference standards
GB 223
3 Technical requirements
Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products Chemical analysis methods for steel and alloys
Metal tensile test force method
Metal Charpy (U-notch) impact test method Metal Brinell Ou test force method
3.1 Chemical analysis
3.1.1 The chemical composition of raw materials and rough parts shall comply with the provisions of Table 1. The deviation shall comply with the provisions of GB222.
ICrllMo
3.2 Hardness
0.10~0.15
0. 11~0. 18 0. 50
0. 60 10. 030
0.0300,030
The hardness of the blade rough parts after heat treatment shall comply with the provisions of Table 2. Table 2
1991-07-01 Tumor
11. 50~-13. 50
JB/T3073.1
10. 00~11. 500.50~0.700. 25~0. 40 0.30%
Brinell hardness
187~229
192-235
Annealing or tempering at room temperature
1992-07-01Small cable
iCrl1Moy
JB/T3073.1
Brinell hardness
192~211
212~2-18
Annealing or tempering at high temperature
3.3. Mechanical properties
The results of the blade roughness that needs to be tested for performance after heat treatment shall comply with the provisions of Table 2. At this time, the hardness value shall not be used as the basis for acceptance. 34 Appearance quality
3.4.1 The shape and size of the blade roughness shall comply with the requirements of the forging sample, and its profile allowance, thickness deviation, bending, residual burr and error shall comply with the provisions of Table 3.
Blade roughness length
Profile single-sided impurity4
Sequence deviation
Bending skin
Carbon residual burr
2200300
≥>300～400
>400~500
3.4.2 Blade roughness surface and no cracks, folds and other defects are allowed. If there are defects, they must be removed by grinding before heat treatment, and the grinding depth shall not exceed 1/2 of its single-sided allowance. The grinding area should be smoothly transitioned with the contact surface. 3.4.3 The depth of pits, depressions and other defects on the surface of the blade roughness shall not exceed 1/2 of its single-side allowance. 3.4.4 The total value of defects at the corresponding parts of the same cross-section shall not be greater than 3/4 of its single-side allowance. 3.5 Process requirements
35.1 The blade roughness should be charged separately for each melting furnace number and shall not be mixed. 3.5.2 The blade roughness must be heat treated within 24 hours after forging. 3.5.3 After heat treatment, the blade roughness can be cold or hot corrected. After cold correction, the original surface needs to be tempered to remove stress. The heat correction temperature and stress relief annealing temperature should be 30℃ to 50℃ lower than the original annealing humidity. 3.5.4 The oxide scale of the blade roughness should be removed after heat treatment. 3. If cracks are found in the blade roughness after fine processing, they should be reported. 4 Test methods
4.1 Chemical analysis can be carried out by other methods that meet the viscosity requirements of GB223. If there is any objection, the tensile analysis should be carried out according to G223. The sampling method for analysis should be in accordance with GB222.
4.2 Hardness determination should be carried out according to G231.
4.3 Tensile test method should be carried out according to GB228. 5 Inspection rules
5.1 Inspection and acceptance
Inspection and acceptance should be carried out by the quality inspection department. 5.2 Division of batches
JB/T3073.1
Blade pieces should be accepted in batches. Each batch consists of pieces from the same smelting furnace number, the same heat treatment (tempering) furnace or the same continuous heat treatment furnace.
5.3 Chemical analysis
5.3.1 The chemical composition of raw materials can be randomly inspected according to the furnace number according to the quality assurance certificate. 5.3.2 The chemical composition of blade pieces shall be based on the re-test of the source material and may be sampled if necessary. 5.4 Hardness of blade pieces shall be sampled after heat treatment. The sampled number shall not be less than 5% and not less than 20 pieces per batch. If the hardness is found to be inconsistent with the requirements, the hardness of all pieces in the batch shall be measured. 5.5 Mechanical properties 5.5.1 From each batch of blade pieces, take 2 pieces of the lowest and highest hardness values ​​for the preparation of test specimens. 5.5.2 Cut a set of longitudinal test specimens (one tensile and two impact) from the selected blade pieces. For small blades, if necessary, two pieces of the same hardness may be taken to prepare a set of longitudinal test specimens. It is not allowed to cut the specimens by heat treatment. 5.5.3 If the specimen has material or mechanical defects, the test results shall be invalid and the specimen shall be re-sampled for testing. If the material defect is determined to be white spots, the batch of blade pieces shall be scrapped.
5.5. If the test results of some items do not meet the requirements of this standard, the specimens with the same hardness value as the first test shall be selected from the same test blade or the same batch to re-test the non-compliant items. If one item still does not meet the requirements, the batch of blades shall be unqualified: However, it is allowed to re-classify the hardness of the batch of blades and re-test them (the total number of heat treatments shall not exceed three times, and the number of temperings is unlimited). If it still fails to meet the requirements, the batch of blades shall be scrapped. 5.6 Appearance
5.6.1 The shape and size of the blade blades shall be checked in accordance with Articles 3.4.1 and 3.4.4. 5.6.1 The surface quality of the blade parts should be checked directly by eye, and the marks and quality assurance certificate should be observed.
6.1 The blade parts that have passed the inspection should be marked as follows: a
Inspection pass mark,
Melting furnace number and heat treatment furnace number (code) Manufacturer mark.
6.2 Quality assurance certificate
Each batch of blade parts delivered should be accompanied by a quality assurance certificate, the contents of which are as follows! a.
Drawing number Order number
Material brand and chemical composition:
Melting furnace number and heat treatment furnace number (code): Delivery quantity
The results of all inspection and test items
Provide the last heat treatment process parameters: This standard number: bzxZ.net
The signature of the person in charge of the quality inspection department.
Additional explanation,
This standard was proposed and managed by the Upstream Power Generation Equipment Complete Design Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Shanghai Power Generation Equipment Complete Design Research Institute and the Shanghai Steam Turbine Factory. 3
JB/T3073.1
880b1230
19XX Nest XX Cabin
Hong Cancer Snake
100044
Dai Duan x/X
Matrix XXX.XXX
19XX Nest XX Ridge
Purchase XXX.XX Guest
Peng Xian Ji Key Paste
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