This standard specifies the technical conditions, test methods and inspection rules for die-forged moving blade blanks for steam turbines. This standard applies to die-forged moving blade blanks for steam turbines. JB/T 3073.2-1991 Technical conditions for die-forged moving and stationary blades and hot-rolled stationary blade blanks for steam turbines Die-forged moving blade blanks JB/T3073.2-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T3073.2
1991-07-01Juan
Jia Kui Wa Yi
Zhang Xian Ji
1992-07-01Xiao Suo
Jia Kui Wa Yi Xin
Peng Orbital Ke Ke
Hong Yan
This standard specifies the technical requirements, test methods and inspection rules for the die forged moving blades of steam turbines. This standard applies to the die forged moving blades of steam turbines. 2 Reference standards
GB 1979
GR 2106
GB 6394
GB10561
Chemical analysis of steel Sampling method and allowable deviation of chemical composition of finished products Chemical analysis methods for steel and alloys
Macrostructure and defect acid etching test method for steel Tensile test method for metals
Method for Charpy (U-notch) impact test for metals Rating diagram for macrostructure defects of structural steel
Method for Charpy (V-notch) impact test for metals Determination of average grain size of metals
Microscopic evaluation method for non-metallic inclusions in steel
ZBK54.002 Magnetic particle inspection method for turbine blades 3 Technical requirements
3.1 Raw material requirements
3.1.1 Metallurgical method
Raw materials should be smelted in electric furnace and remelted by electric irrigation. 3.1.z Chemical composition
The chemical composition of raw materials shall comply with the provisions of Table 1. The deviation value shall comply with the provisions of JB/T3073.21991
JB3073.21982
3.1.3 Macrostructure
The cross-sectional acid leaching macrostructure of steel shall be uniform, without visible bubbles, shrinkage cavities, inclusions and cracks, and its general looseness, central looseness and segregation shall not exceed Level 2.
3.1.4 Non-metallic inclusions
3.1.4.1 The raw materials of the three grades of 1Cr12Mo, 2Cr12Ni1Mo1W1V and 0Cr17Ni4Ca4N shall be inspected for non-metallic inclusions. The four types of inclusions, sulfide, alumina, silicate and spherical oxide, shall not exceed Level 2 of the ASTM standard rating chart. 3.1.4.2 The requirements for the level of non-metallic impurities of other material grades can be negotiated between the supplier and the buyer. 3.1.5 Microstructure
3.1.5.1 The raw materials of 1Cr12Mo2Cr12Ni1Mo1W1V and OCr17Ni4Cu4Nb should be tested for B iron content.
1991-07-01
1992-07-01
JB/T3073.2
The maximum iron content of 1Cr12Mo shall not exceed 5%; the average content of 2Cr12Ni1Mo1W1V and OCr17Ni4Cu4Nb shall not exceed 5%, and the most serious field shall not exceed 10%.
3.1.5.2 If 1Cr13 steel needs to be tested for % iron content, the average ferrite content of 1Cr13 steel shall not exceed 5%, and the most serious field shall not exceed 10%.
3.2 Requirements for blade roughness
3.2.1 The chemical composition, non-metallic inclusions and microstructure of blade roughness shall comply with the provisions of 3.1.2, 3.1.4 and 3.1.5. 3.2.2 Grain size
The grain size of blade roughness after heat treatment at high speed shall not be coarser than Grade 4. 3.2.3 The hardness of blade roughness after final heat treatment shall comply with the provisions of Table 2. 3.2.4 Mechanical properties
After the final heat treatment of blade roughness, the test results obtained by sampling at any part of it shall comply with the provisions of Table 2. 2
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JB/T3073.2
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Bumin hardness
192~241\1
212~26217
229~277
212~262\
229~277\
248-2931>||tt ||269-3111
217~255
241--285
277~331
262-302
277~-311
Fleece face
The thickest one
Note! 1) The range of band hardness values ​​listed in the table is not used as the basis for acceptance, but only as the basis for checking the uniformity of heat treatment of blade roughness, whether to send for inspection of mechanical properties and selecting mechanical property samples.
3.2.5 Appearance quality
3.2.5.1 The shape and size of blade roughness shall be in accordance with the requirements of the forging drawing. Its profile, allowance, thickness deviation, bending, residual burr and misalignment shall comply with the provisions of Table 3.
Steam channel height
Profile single side allowance a
Thickness deviation
Residual burr ≤
>300~-500
>500-700
3.2.5.2 The surface of blade roughness shall not have cracks, folds and other defects. If there is any, it must be removed by grinding before heat treatment. The grinding depth shall not exceed 1/2 of the single-side allowance. The grinding place shall be in transition with the connecting surface. 3.2.5.3 The depth of pits, depressions and other defects on the surface of the blade roughness shall not exceed 1/2 of the single-side allowance. 3.2.5.4 The total depth of defects at the corresponding parts of the same cross section shall not be greater than 3/4 of the single-side allowance. 3.2.6 Process requirements
3.2.6.1 Blade roughness shall be charged separately according to each smelting furnace number and shall not be mixed. After forging, the smelting furnace number or code shall be marked on the blade root or designated position piece by piece:
JB/T3073.21991
3.2..2 Blade roughness shall be heat treated within 24 hours after forging. 3.2.3 Blade roughness can be shaped and heat corrected after heat treatment. After cold correction, stress relief tempering is required. The temperature of hot correction and stress relief tempering should be 30℃ to 50℃ lower than the original tempering temperature. 3.2.6.4 The oxide scale should be removed after the rough heat treatment of the blade. 3.2.6.5 The blade should be scrapped if cracks are found after fine processing. 3.2.7 Magnetic particle inspection
After fine processing, the entire surface of each blade should be subjected to magnetic particle inspection. The inspection results should meet the following requirements. 3.2.7.1 The blade surface is not allowed to have cracks and transverse defects (defects with an angle greater than 30° with the blade axis). 2.7.2 Within the 5mm range from the blade inlet and outlet steam edge, the transition from the line to the brown root, the blade root and the blade lock line hole 10mm range, magnetic decay caused by defects is not allowed. 3.2.3 Except for the parts specified in Article 3.2.7.2, the length of a single defective magnetic mark should not exceed 6mm, the total length should not exceed 12mm, and the total number of cases should not exceed 5 (the starting length is 0.5mm). For two defective magnetic marks on the same straight line, when the distance between them is less than 3 times the length of the longer defect, they shall be counted as one.
3.2B Magnetic marks exceeding the requirements of 3.2.7.2 and 3.2.7.3 may be partially removed within the tolerance range specified in the drawing, and re-inspected after polishing.
4 Test methods
4.1 Chemical analysis may be carried out by other methods that meet the accuracy requirements of CB223. If there is any objection, mechanical analysis shall be carried out in accordance with GB223, and the analysis method shall be in accordance with GB222.
4.2 Macrostructure inspection shall be in accordance with GB226, and grading shall be in accordance with GB1979. 4.3 The inspection of non-metallic inclusions shall be in accordance with GB10561 or GB8732. 4.6 The inspection of ferrite shall be in accordance with the grid method with a magnification of 250 times and 10 small fields. The average value is the percentage of ferrite. Other methods may be used after consultation between the two parties.
4.5 The method for determining grain size shall be in accordance with GB6394. 4. The method for determining long hardness shall be in accordance with GB231. 4.The tensile test method shall be in accordance with the provisions of GB228. The impact test method of 1Cr12Mo shall be in accordance with the provisions of GB2106. The materials of other grades shall be in accordance with the provisions of GB229. The magnetic particle detection method shall be in accordance with the provisions of ZBK54002. 4.9
5 Inspection rules
Inspection and acceptance
Inspection and acceptance shall be carried out by the quality inspection department. 3.2 Division of batches
The blade rough parts shall be inspected by batch. Each batch shall consist of rough parts of 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 the raw materials shall be re-inspected one by one according to the furnace number of the quality guarantee. 5.3.1 The chemical composition of the blade rough parts is generally based on the re-inspection of the material. If necessary, random inspection can be carried out. 5.+ Low-power organization shall be sampled according to the furnace number.
5.5 The grain size and iron content of blade hair should be inspected by batch. The specimens are cut from the adjacent parts of the sampling for mechanical properties or the impact specimens. 5. Hardness
The hardness of blade hair should be checked piece by piece after heat treatment. If the process is stable, it is allowed to randomly select the hair that is not used as the acceptance basis for hardness. The number of random sampling shall not be less than 30% per batch. If the hardness is found to be inconsistent with the regulations, the hardness of the batch of hair should be measured piece by piece. 5.7 Mechanical properties
5.7.1 In each batch of blade hair, 2% of the hair with the highest and lowest hardness values ​​are used for preparing specimens, but not less than 2 pieces. When the batch is more than 200 pieces. The number can be reduced appropriately. 5.1.2 Generally, a set of (one tensile and two impact) drifting specimens should be cut from the root of the selected blade hair. However, for large blades, it is allowed to carry test materials on the rough pieces; for small blades, two rough pieces with the same hardness can be taken as longitudinal test pieces when necessary. It is not allowed to cut test pieces by hot working method. 5.7.3 If the test piece has material or machining defects, the test result is invalid and the sample should be re-tested. If the material defect is a point, the whole batch of blade rough pieces shall be scrapped.
5.7.4 If the test results of some items do not meet the requirements of this standard, double the number of test pieces shall be cut from the same test blade rough piece or the rough piece with the same hardness value as the first test in the same batch to re-test the non-compliant items. If there is still one item that does not meet the requirements, the batch of rough pieces shall be unqualified, but the hardness of the batch of rough pieces can be reclassified and inspected or re-heat treated (the total number of annealing times shall not exceed three times, and the number of tempering times is unlimited) and re-tested. If it still fails, the batch of rough pieces shall be reported as unqualified. 5.8 Appearance quality
%.1 The shape and size of the rough pieces shall be checked according to the requirements of Article 3.2.5. 5.8.2 The surface quality of the blade pieces should be sent for direct visual inspection. 6 Marking and quality certificatewwW.bzxz.Net
6.1 Marking
The blade pieces that have passed the inspection should be marked as follows: Inspection pass mark:
Smelting furnace number and heat treatment furnace number (or code): Manufacturer's mark,
6. 2 Quality certificate
Each batch of blade pieces delivered should be accompanied by a quality certificate, the contents of which are: Drawing number or order number,
Material brand and chemical composition,
Smelting furnace number and heat treatment furnace number (or code): Delivery quantity:
The results of all inspection and test items;
Provide the process parameters of the last heat treatment, this certificate number:
Signature and seal of the person in charge of the quality inspection department.
Additional remarks;
This standard was proposed and managed by Shanghai Power Generation Equipment Complete Design Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Shanghai Power Generation Equipment Complete Design Institute and Shanghai Steam Turbine Factory.6
JB/T3073.2
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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