JB/T 7349-1994 Francis turbine welded runner stainless steel blade castings JB/T7349-1994 standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Welded runner of Francis turbine
Stainless steel blade castings
1 Subject content and scope of application
JB/T734994
This standard specifies the ordering, manufacturing, product dimensions, test methods and inspection and acceptance rules of stainless steel blade castings for welded runners of Francis turbines.
This standard is applicable to stainless steel blades of welded runners of Francis turbines of various specifications and is the basis for the supplier to deliver after rough grinding. 2 Reference standards
GB2106
GB6397
GB7233
GB 9443
GB 9444
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
Metal Charpy (U-notch) impact test method Metal Brinell hardness test method
Metal Charpy (V-notch) impact test method Metal tensile test specimen
Ultrasonic flaw detection and quality rating standard for steel castings Penetrant flaw detection and defect display trace rating method for steel castings Magnetic particle flaw detection and quality rating method for steel castings GB11352
3 Ordering requirements
Carbon steel castings for general engineering
3.1 The purchaser shall specify the adopted standards, casting grades, material grades, corresponding technical requirements and inspection items and other additional instructions in the order contract and order agreement.
3.2 When placing an order, the purchaser shall provide the supplier with the order drawing and indicate the product size, tolerance, surface roughness and test block location and size. 4 Technical requirements
4.1 Manufacturing
4.1.1 RefiningbzxZ.net
Blade steel shall be smelted in electric arc furnace or refining furnace. Other smelting methods may be used with the consent of the purchaser. 4.1.2 Casting
Internal cooling iron is not allowed to be used during casting, and process increase shall be removed before final heat treatment. 4.1.3 Heat treatment
Castings shall be heat treated, and the final heat treatment is normalizing and tempering. 4.1.4 Repair
Approved by the Ministry of Machinery Industry on July 18, 1994
Implementation on July 1, 1995
JB/T7349-94
4.1.4.1 The welding repair of casting defects shall be performed by qualified operators according to the welding repair process requirements before the final heat treatment of the casting, and the welding rod shall be similar to the material of the casting.
4.1.4.2 Defects with a depth exceeding 25mm or exceeding 20% ​​of the thickness of the section (if the thickness of the casting is less than 20mm, it shall be calculated as 20mm), or a single defect area exceeding 6500mm2 shall be considered as a major defect. The welding repair of major defects shall be recorded and provided to the purchaser.
3 Before welding repair, the defects shall be cleaned and inspected by magnetic powder or coloring flaw detection. 4. 1. 4. 3
After welding repair of major defects, stress relief heat treatment shall be carried out, and inspection shall be carried out according to the original flaw detection standard requirements to confirm that the welding repair quality is qualified. 4.1.4.4
4.1.5 Machining
4.1.5.1 Castings shall be roughly ground at the supplier's side. 4.1.5.2 The finishing and finishing allowance of castings shall be agreed upon by the supplier and the purchaser. 4.2 Chemical composition
The chemical composition shall comply with the provisions of Table 1. If the purchaser has no special requirements, the residual elements will not be used as the basis for acceptance. 4.3 Mechanical properties
Hardness value will not be used as the basis for acceptance if the purchaser has no special requirements. The mechanical properties of the castings shall comply with the requirements of Table 2.
Material brand
)6(r13Ni4Mo
706Cr13Ni5Mo
7G06Cri3Ni6Mo
Zo6tr16Ni5Mo
Note: Cn.W, V are residual elements.
Material brand
Z06Kr13Ni4Mo
ZG06Cr13Ni5Mo
ZG06Cr13Ni6Mo
7(06Cr16Ni5Mo
Note: The buyer can choose one of the U-shaped and V-shaped notches of the impact test specimen. 4.4 Casting quality
4.4.1 General requirements
Chemical composition
Mechanical properties
The surface of the casting should be treated and there should be no defects such as sand holes, pores, cracks, etc. 4.4.2 Surface quality
The surface roughness of the casting should meet the requirements of flaw detection. 4.4.3 Shape and size tolerance
4.4.3.1 The shape and size of the casting should meet the requirements of the order drawing. N
Aku(Akw)
≥63(≥50)
221~286
221~286
JB/T7349—94
4.4.3.2 The gap between the sample and the blade profile should be less than or equal to 0.002D (D. is the nominal diameter of the runner), and only three-point tolerance is allowed to be 0.003D24
4.4.3.3 The allowable deviation of the blade inlet and outlet water edge profile is ±0.001Dz. 4.4.3.4 The allowable deviation of blade thickness is (-0.04~+0.08)T+2mm (T is the pattern thickness of each measuring point). 4.4.3.5 The waviness of the front and back sides of the blade is expressed by the H/L value (L is the gap length, and H is the maximum gap size within this length). The waviness H/L should be less than 2%, and the waviness H/L of the cavitation-prone part on the back should be less than 1%. 4.4.4 Nondestructive testing
4.4.4.1 Magnetic particle inspection
Magnetic particle inspection should be carried out on the blade surface, and the test results should comply with the 2~3 level regulations in GB9444. Or a color penetration test can be carried out as required by the purchaser.
4.4.4.2 Ultrasonic inspection
The blades are tested for ultra-Luper flaws at the welding parts with a sensitivity of $6. The flaw detection range should be 1 to 2 times the maximum thickness of the part. The test results should comply with the provisions of level 2 to 3 in GB7233. Or according to the requirements of the belt. 5 Test methods and inspection rules
5.1 Chemical composition analysis
5.1.1 The chemical composition should be checked furnace by furnace. The analysis test block should be prepared in the middle of pouring. 5.1.2 The sampling and analysis methods of chemical composition analysis shall be carried out in accordance with the provisions of GB222 and GB223. 5.2 Mechanical properties test
5.2.1 The shape and size of the test specimens for mechanical properties test shall be carried out in accordance with the provisions of GB6397. The test block can be attached to the casting body or cast separately and heat treated together with the casting. The number of test blocks must be sufficient. The shape and size of the single casting test block shall be carried out in accordance with the provisions of GB11352. The location and method of the attached casting test block shall be agreed upon by both parties, but the thickness of the test block shall not exceed 28mm. 5.2.2 Take 1 tensile specimen and 3 impact specimens from the same heat treatment furnace test block. The average value of the impact test results shall comply with the provisions of Table 2. Among the 3 impact specimens, only one specimen is allowed to have an impact value lower than the value specified in Table 2, but not lower than 2/3 of the specified value. The tensile test shall be carried out in accordance with the provisions of G13228, and the impact test shall be carried out in accordance with the provisions of GB229 or GB2106. 5.2.3 The hardness shall be measured on the specimen, and the hardness test shall be carried out in accordance with the provisions of GB231. 5.2.4 Retest and reheat treatment
When the mechanical properties test results are unqualified, double sampling shall be carried out for retest. If the retest results are still unqualified, reheat treatment may be carried out, and the number of reheat treatments shall not exceed two times.
5.3 Nondestructive testing
5.3.1 Surface inspection
Magnetic particle inspection shall be carried out in accordance with the provisions of GB9444. Coloring inspection shall be carried out in accordance with the provisions of GB9443. 5.3.2 Ultrasonic test
Ultrasonic test shall be carried out in accordance with the provisions of GB7233. 5.4 Shape and size test
5.4.1 The blade profile is checked with a sample. The sample and its instructions for use shall be provided by the purchaser. 5.4.2 Surface waviness test
5.4.2.1 The waviness is checked with a 1-meter flexible ruler parallel to the water flow direction and perpendicular to the water flow direction, as shown in Figure 1. For small and medium-sized turbine blades, the length of the flexible ruler used shall not be shorter than 1/2 of the airfoil chord length. 5.4.2.2 During the inspection, place the flexible ruler on the blade surface so that the surface of the ruler conforms to the smooth curved surface of the blade. After measuring one surface, measure the adjacent surface. When the overlap of the flexible ruler with the previous curved surface shall not be less than 150mm; if the site is limited, when the flexible ruler is shorter than 650mm for inspection, the overlap between the front and rear shall not be less than 10% of the ruler length. 5.4.3 Inspection of the water inlet and outlet profiles
JB/T7349—94
5.4.3.1 The water inlet profiles shall be inspected with a template. For low specific speed turbines, two sections shall be inspected for each blade; for high specific speed turbines, three sections shall be inspected for each blade. The water inlet profile template shall extend from the top end of the blade along the front and back sides of the blade by 0.1D long. As shown in Figure 2 and Figure 3. Flexible ruler
Blade surface
Select waterside section
Waterside section
Wave degree inspection
Inspection position of runner blade
Figure 3 Inspection position of blade waterside profile
5.4.3.2 Check the waterside profile with a template. Each blade should be inspected at 3 sections. The front waterside profile template should extend from the blade tail end along the blade 0.1D long; the back waterside profile template should extend from the blade tail end 0.15D long. As shown in Figure 2 and Figure 3. 1101
Quality certificate
JB/T7349-94
When delivering goods, the supplier must provide the purchaser with a quality certificate, which shall include the following contents: a.
Order contract number;
Order drawing number;
Product material brand;
Standard number:
Smelting number, part number;
Product size, weight:
Chemical composition analysis results;
Mechanical properties test results;
Non-destructive testing results;
Blade profile inspection record;
Major defect welding repair record;
Other additional inspection results.
Marking, packaging
The supplier shall mark each casting with the contract number, furnace number, part number, etc., and circle it with white paint. 7.2 The supplier shall package the products according to the requirements of transportation conditions. Additional remarks:
This standard was proposed and managed by the Deyang Large Casting and Forging Research Institute of the Ministry of Machinery Industry, and was drafted by Tianjin Heavy Machinery Factory. The main drafters of this standard were Ni Yisheng and Zhao Yuzhi. 1102
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