This standard specifies the technical requirements and inspection rules for cast turbine stator blades and nozzles. This standard applies to the blanks and finished products of cast turbine stator blades and nozzles. JB/T 3073.5-1993 Technical requirements for cast turbine stator blades JB/T3073.5-1993 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T3073.5
1993-08-21
1993-10-01
Ji Kui Ji
Ji Jia Xin Kui Lu Wa Yi Dao
1Gu Mei
This standard specifies the technical requirements and inspection rules for steam turbine cast stator blades and nozzles. This standard applies to the rough and finished products of cast stator blades and nozzles for steam turbines. Reference standards
GB 222
GB4058
GB 6060. 1
GB 6414
3 Technical requirements
3.1 Production process
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 method
Gold code Charpy (U-notch) impact test method Gold base Brinell facility test method
Steam turbine cleanliness standard
Surface roughness comparison sample casting surface
Casting dimension tolerance
JB/T3073.51993
JB3073.51982
Casting stationary blades can be precision cast by investment casting, and then grinded and polished into products, or cast by sand mold or ceramic mold, and then cut and polished into products. Melting is produced by induction furnace. 3.2 Chemical composition
The chemical composition of the finished product shall comply with the provisions of Table 1.
Material grade
ZG1Cr13
ZG2Cr13
ZGICr11MoV
12.0~14. 0
12. 0~14. 0bzxZ.net
10. 0~11. 5 0. 50~0. 700. 25~0. 40Mn
0. 10~0. 150. 030, 035
o.16~0.24
0.030.035
0.11~0.18≤0.030.035
ZG1Ct12WMoV 11. 0~13. 0 b. 50~0. 700. 15~0, 300. 50~0. 90:00. 4 0. 40~~ 0. 80 0.
. 12~0. 18≤0. 03≤0. 030. 70~1. 10ZGOC+19Nig
17.75~21.25
3.3 Mechanical properties
The mechanical properties of the final heat treatment of the casting shall comply with the requirements of Table 2. 3.4 Gross requirements
3.4.1 Surface quality
≤2.0Q7.75~11.25
0.04 $0.04
3.4.1.1 100% of the castings shall be inspected for appearance. The surface sand, oxide scale and core sand of the mold hole must be cleaned and shall comply with the requirements of GB4058-4.
1993-08-21
1993-10-01Small cable
Material brand
ZG1Cr13
ZG2Cr13
ZG1Crl1Moy
ZGiCrl2wMo
ZGoCr19Nis
Note: The degree is not used as the basis for acceptance.
JB/T3073.5
3.4.1.2 Castings are not allowed to have cracks, penetration and corresponding defects after visual inspection.
187~235
207~255
197241
197229
3.4.1.3 The residual height of the gate of the stationary blade with a steam channel height less than 600mm is less than 5mm: the residual height of the gate of the stationary blade with a steam channel height greater than or equal to 600mm is less than 10mm. Note: The steam channel height refers to the height of the flow-through part of the blade (the same below). 3.4.1.4 Defects within the processing allowance are allowed to exist. 3.4.1.5 The defects allowed in the finished product are also allowed to exist in the rough surface, and their depth can be added with the allowance left for rough damage. 3.4.1. It is not allowed to have more than 5 scattered holes with a diameter of less than or equal to 2.5mm and a depth of less than or equal to 2mm. Holes with a diameter of less than or equal to 1mm and a depth of less than or equal to 0.5mm are not counted. 3.4.1.7 Repair welding is allowed for defects exceeding the requirements of the finished product. The requirements for repair welding are shown in Article 3.4.3. 3.4.2 Intrinsic quality
3.4.2.1 During the trial production of stationary blades with a steam inlet height greater than or equal to 300mm, each batch of test pieces shall be no less than 10 pieces, and 50% of them shall be randomly selected for X-ray film inspection.
3. 4. 2. 2
The evaluation of manufacturing defects on the radiographic images shall be in accordance with the provisions of Table 3. Table 3
Defect categories
Foreign inclusions
3.4.2.3 Radiographic film shall not be used as a quality inspection standard for finished products, but as a basis for process finalization. 3.4.3 Welding repair requirements
See Figure 1
See Figure 2
See Figure 3
3.4.3.1 For stationary blades with a steam duct height of less than or equal to 300mm, the following single defects can be repaired by welding at a distance of 10mm from the steam outlet: a hole defect with a diameter of less than or equal to 5mm and a depth not exceeding one-third of the wall thickness at that location; 4
a strip defect with a length of less than 3mm and a depth not exceeding one-third of the wall thickness at that location. b.
3.4.3.2 For stationary blades with a steam duct height of more than 300mm, if there are defects on the casting surface, repair welding can be performed. 3.4.3.3 Before repair welding, the defects must be cleaned up until the original color of the metal is exposed. Repair welding procedures shall be compiled according to different materials. 3.4.3.4 The weld blister must be flat, and no welding defects are allowed after self-testing and inspection. 3.4.4 Shaping requirements
3.4.4.1 When the deformation of the stationary blade exceeds the requirements of the finished product (plus the repair margin), it is allowed to be repaired manually or mechanically according to the shaping process. The stationary blade after shaping should still meet the rough surface quality requirements. 3. 4. 4.2
3. 4. 4. 3
Stationary blades should be subjected to stress relief treatment after shaping. 3.5 Finished product requirements
3.5.1 Surface quality
3. 5. 1. 1Stationary blades are not allowed to have cracks or missing meat. JB/T3073.51993
JB/T3073.51993
3.5.1.2 Hole defects (such as sand holes, pits, inclusions and pores) are allowed on the steam channel profile. For specific requirements, see Figure 4, Table 4 and Table 5. 3.5.1.3 A maximum number of defects are allowed on the finished stationary blades, but they cannot be concentrated on the same short surface at the same time. 3.5.1.4 The surface defect requirements of the two inner end faces of the nozzle are the same as those in Table 4, position ③. Holes with a diameter of less than or equal to 0.3mm and a depth of less than or equal to 0.3mm are not counted (no concave holes are allowed in the concave position of Figure 4). 3.5.1.5
The stationary blades with a duct height greater than or equal to 600mm shall be inspected according to the medical 5 partitions. 3.5.1.6
Note: The ", " size is the calculated value of 20 of the blade profile B size -4
duct quotient
50100
100150
150300
300600
Dispersed holes
20.5×0.5 1
JB/T3073.51993
Steam channel profile allows hole defects
Dense holes
Not allowed
0. 8×0. 5. Spacing greater than or equal to
20. 5×0. 5,
greater than 5mm 2
3/cm21
81×0.5. Spacing greater than or equal to 6.5×0.5, Y track height
5mm23
1.5×0.5, Spacing greater than or equal to
greater than
3
1.5×0.5, Spacing greater than or equal to
greater than
greater than
4
3/cm2 2 places
20.5x0.5.
3pcs/cm23 places
20.5X0.5.
3pcs/cm24 places
Dispersed holes
1.5×0.5, spacing greater than
5mm25 places
1.5×0.5, spacing greater than
5mm35 places
1.5×0.5, spacing greater than
5mm45 places
α1.5×0.5, spacing greater than
5mm55 places
α0.5×0.5, tons of people" etc.
6 at 5nm
Table 5 Pore defects allowed on the steam channel surface
Dense holes
0. 5×0. 5,
3/cm22
20. 5× 0. 5,
3/cm23
@0.5×0.5.
3/cm24
0. 5× 0. 5,
3/cm25
8.5×0. 5,
3 pieces/cm26 places
Every 50mm steam outlet edge
Defect category
Allowable number of height
25mm Heavy wind
2.5mml More important area
Figure 5 General area and important area diagram of static blade
3.5.1.6.1Linear defects (length greater than 3 times of equal width) are not allowed on the static blade surface. The general area is tested by daily measurement according to the provisions of Table 5. The A and B defects in Table 5 are not allowed in the important area. 3. 5. 1. 6. 2
3.5.1.6.3In the important area, 10% of the batch is randomly selected for color flaw detection. If there are linear defects, 100% inspection shall be carried out. Distance between opposite defects
JB/T3073.51993
3.5.1.7 If defects occur after machining, repair welding is allowed without heat treatment. However, the depth of the defect shall not exceed 20% of the wall thickness at that location. The total repair welding area shall not exceed 8% of the total area of ​​the inner and back arcs. After repair welding, non-destructive testing shall be performed. 3.5.1.8 The dimensional tolerances of the steam duct shall comply with the provisions of Table 6. Table 6
Steam duct height
50h100
100150
150h≤300
300
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