This standard specifies the technical requirements for the raw materials and finished products of precision forged moving blades. This standard applies to precision forged moving blades for steam turbines and industrial steam turbines (except for imported 300, 600MW steam turbine precision forged moving blades). JB/T 3073.4-1993 Technical conditions for precision forged moving blades for steam turbines JB/T3073.4-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T3073.4
1993-06-01
JB/T3073.41993
This standard specifies the technical requirements for the raw materials and finished products of precision forged moving blades. This standard applies to precision forged moving blades for steam turbines and industrial steam turbines (except for the imported 300, 600MW steam turbine precision silver moving blades). 2 Reference standards
GB 226
GB1220
GB1221
GB1979
GB6394
GB10561
ZB K54 002
ZB K54 023
ZE K54 009
3 Technical requirements for raw materials
Method for sampling samples for chemical analysis of steel and allowable deviation of chemical composition of finished products Chemical analysis methods for steel and alloys
Method for measuring the depth of decarburized layer of steel
Method for acid etching test of macrostructure and defects of pins Metal tensile test method
Method for Charpy (U-notch) impact test of metals Metal Brinell hardness test method
Stainless steel bars
Heat drop resistance||tt ||Defect rating chart of low-pitched structure of structural steel
Metal average grain size determination method
Microscopic evaluation method of non-metallic inclusions in steelbZxz.net
Magnetic particle flaw detection test method for turbine blades
Physical and chemical inspection of main special parts of turbines
Special inspection method for main parts of turbines
Metal microstructure inspection method
3.1 Precision forged moving blades should use stainless steel bars for hot rolling or forging hot processing by electroslag remelting. 3.2 Chemical composition
3.2.1 When raw materials enter the factory, the chemical composition should be re-tested by remote furnace according to the quality assurance certificate and the furnace number, and the analysis results should meet the requirements of Table 1. Yingji
1993-06-01 tumor
1994-01-01 small cable
Material brand
1Cr11MoV
1Cr12WMoV
Standard number
GB1221
GB1220
GB1221
GB122 1
JB/T3073.41993
40.6050.50
Note, 1Ct13 carbon content is required for steel for turbine blades, 3.2.2 Chemical analysis sampling method is carried out in accordance with GB22211.00
40.03040.030
3.2.3 Chemical composition analysis is carried out in accordance with GB223. In daily analysis, other methods that meet the accuracy requirements of GB223 are not excluded, 3.2.4 The deviation of the chemical composition of raw materials shall comply with the provisions of GB222, 3.3 Macrostructure
3. 3. 1 Acid immersion macrostructure
3.3.1.1 Sampling macrostructure according to furnace number. On the transverse acid immersion test piece, there shall be no visible bubbles, cracks, inclusions, axial intergranular cracks, skinning and shrinkage residues. General looseness, central looseness and square-shaped segregation shall not exceed level 2. If white spots are found, the batch of materials shall be reported.
3.3.1.2 Acid leaching macrostructure inspection shall be carried out in accordance with GB226, and the rating shall be carried out in accordance with GB1979. 3.3.2 Inspection method shall be carried out in accordance with ZBK54009. 3.4 Non-metallic inclusions
3.4.1 Non-metallic inclusions shall be sampled according to the furnace number, and the A, B, C, and D categories shall not be greater than level 3. 3.4.2 The evaluation of non-metallic inclusions shall be carried out in accordance with GB10561. 3.5 Machine quilt performance
3.5.1 Mechanical properties shall be sampled according to the furnace number, and the tensile, impact and Brinell hardness values ​​shall all comply with the provisions of GB1220 or GB1221. 3.5.2 The mechanical properties test methods shall be carried out in accordance with GB 228, GB 229 and GB 231. 4 Technical requirements for precision forgings (blade forgings without machining of the inner back arc of the blade). 4.1 Precision forgings shall be charged according to the smelting furnace number. The furnace number mark of the steel section shall be checked one by one. Each rough part shall be marked with the smelting furnace number or code at the blade. 4.2 After forging, the precision forging shall be quenched and tempered or preparatory heat treatment within 24 hours. 4.3 After heat treatment, the precision forging can be cold or hot calibrated. In principle, stress relief tempering shall be carried out for cold calibration. 4.4 After quenching and tempering, the precision forging shall be tested for mechanical properties. The values ​​shall comply with the provisions of Table 2. 2
Material grade
ICt1IMoV
1Cr12WMoV
Yield strength
JB/T3073.41993
Tensile strength
≥653
Elongation
Surface reduction
Impact toughness
Brinell degree
192~241
2 12~262
229~277
212262
229277
229~277
248~293
269~311
Note: The Brinell hardness range 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 precision forgings and judging whether to send them for mechanical properties inspection and selecting mechanical properties samples.
4.4.1 The hardness of precision forgings shall be sampled by batch, and the number of samples shall not be less than 30% of the number of pieces in the batch. If the hardness value does not meet the requirements of Table 3, then 100% of the batch of blades shall be hardened (each batch consists of precision forgings of the same smelting furnace number, the same heat treatment furnace or the same heat treatment furnace continuous furnace). 4.4.2 In each batch of blades with qualified hardness, take the blades with the highest and lowest hardness values, a total of 2%. But not less than 2 pieces. When the batch is less than 10 pieces, it is allowed to select one piece with the highest or lowest hardness value and send it for mechanical property inspection. 4.4.3 Take one tensile and two impact longitudinal specimens from the root of the selected blade. Large blades are allowed to take samples on the rough surface to take mechanical property specimens. If necessary, two pieces of blades with the same hardness can be taken from small blades to prepare a set of longitudinal specimens. It is not allowed to take samples from the blades by hot processing. 4.4.4 If a certain performance is unqualified. It is allowed to re-inspect the batch of blades in sections according to the hardness value. At this time, the batch of blades should be 100% hardened or double specimens should be taken for re-inspection (allowed to include the first test blade. Or take samples from the blades with the same hardness as the first test). Pieces with unqualified mechanical properties are allowed to be re-heat treated. However, the total number of quenching times shall not exceed three times (tempering times are unlimited). If the mechanical property test is still unqualified, the batch of blades shall be scrapped.
4.5 Take a longitudinal specimen from the root of the selected blade (can be cut from the impact test). Conduct microstructure and grain size inspection. 4.5.1 The microstructure should be uniform tempered troostite. The inspection method is in accordance with YB28. 4.5.2 The grain size is generally level 5, but not less than level 4. The inspection method is in accordance with CB 6394. 4.6 The chemical composition of the precision forgings is based on the chemical analysis results of the material inspection. Random inspection can be carried out when necessary. 4.7 After grinding, correction and finishing, the tolerance of the profile part of the precision forgings shall comply with the provisions of Table 3. 4.8 The allowance and tolerance of the processed parts such as the blade root of the precision forgings shall be in accordance with the drawings. Magnetic particle inspection
Magnetic particle inspection is carried out on the entire surface of each precision forging. The inspection results shall comply with the provisions of ZBK54023. The magnetic particle inspection method is carried out in accordance with the magnetic particle inspection method for steam turbine blades in ZBK54002. Table 3
Inner clearance
Maximum thickness Male cover strip
>300400
>400500
>500~600
>600700
2700~800
800-900
Steam channel height
1Minimum
JB/T3073.41993
Continued Table 3
>300~400
400-500
0.4 0,6 0.4
>500-600
7(00~800
>600~?00
Note, (D tolerance value selection needs to consider the size of the workpiece projection area, the same length of the blade, the chord width is larger. A larger tolerance should be taken. [② When measuring, it is positioned according to the three top leaves (2 points at the root of the blade, one point at the top of the blade). mm
>800-900
@Inner back arc mixing board design original account: a The inner is designed according to the theoretical profile, b The kidney arc is designed according to the theoretical profile plus (Rm-DT) I (D pad + △Hma) envelope design.
Schematic diagram
5 Finished product inspection
5.1 The entire surface of each finished blade is checked with a visual gauge. The surface is not allowed to have defects such as pits and pits. The surface roughness of the profile is, inside,
The back breast profile is checked with a sample. Each section should be lightly connected. 5.1 The surface of the finished blade is not allowed to have a carburized layer. If necessary, spot inspection shall be carried out. The inspection method shall be carried out in accordance with GB224 or other methods. 5.3 The size and tolerance of the finished blade shall comply with the requirements of the drawing, including the following items: 8. Comprehensive tolerance of blade profile:
b. Size and position accuracy of the tie rod hole,
Tolerance of the boss deviation from the reference,
d. Size and tolerance of the auxiliary parts such as the blade root, blade body, inlet and outlet edges, and e. Roughness of the blade surface.
5.4 Each finished blade (referring to the blade with a steam duct height greater than 300mm) shall be subjected to a static frequency test. For blades delivered by stage set, the static frequency dispersion of each stage set shall not exceed 6%.
5.5Each finished blade (referring to the blade with a steam channel height greater than 400mm) shall be weighed. For blades delivered in sets, the deviation of the weight of each set shall not exceed 4%.
6Marking, packaging and quality certificate
6.1The precision forged moving blades that have passed the inspection of the quality inspection department shall be marked as follows: Inspection table mark,
. Print the melting furnace number, code and manufacturer mark. 6.2Each batch of blades delivered shall be accompanied by a quality certificate, the contents of which are: Country name and order number:
Material brand and chemical composition:
Smelting furnace number and heat treatment furnace number and code: d. Delivery quantity
Inspection and test items results;
f. The signature of the person in charge of the technical inspection department. 6.3 Packaging
JB/T3073.4
Packaging should be resistant to corrosion, slag and silicon, and easy to transport. 7 Others
Matters not covered in this standard and special requirements shall be implemented according to the technical agreement between the supply and demand parties. Additional remarks,
This standard was proposed by Shanghai Power Generation Equipment Complete Design Institute: This standard was drafted by Shanghai Power Generation Equipment Complete Design Institute and Bladeless Factory, and the drafters of this standard revision were Tao Changjia, Hua Maoyu, Ye Yongqing, Ma Binghui, and Ren Qihua. As of the date of implementation of this standard, JB3073.4-82 "Technical Conditions for Bonded Forged Moving Blades for Steam Turbines" shall be invalidated. 5
JB/T3073.4
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