Some standard content:
ICS77.140.80
Machinery Industry Standard of the People's Republic of China
JB/T7350—2002
Replaces JB/T7350--1994
Stainless steel blade castings for axial-flow hydraulic turbines2002-12-27 Issued
Implementation on 2003-04-01
Issued by the State Economic and Trade Commission of the People's Republic of ChinaForeword
Normative referenced documents
Ordering requirements.
4 Technical requirements,
4.1 Manufacturing.
4.2 Chemical composition.
4.3 Mechanical properties.
4.4 Casting quality,
Test methods and inspection rules
5.1 Chemical composition analysis,
5.2 Mechanical properties test
5.3 Non-destructive inspection.
Quality certificate.
Marking and packaging
Appendix A (Normative Appendix) Inspection of shape and size of blade castings. Appendix B
( Normative Appendix)
Three-dimensional sample
Wave degree inspection.
Supplementary requirements for mechanical properties.
Inlet and outlet edge inspection sample
Table 1 Mass fraction of chemical composition...
Table 2 Mechanical properties
JB/T7350—2002
This standard replaces JB/T7350—1994 "Axial flow turbine stainless steel blade castings". Compared with JB/T73501994, the main changes of this standard are as follows: JB/T7350-2002
Change the delivery method of the original standard from "delivery after rough processing and rough grinding" to "delivery after rough processing or rough grinding": Add the composition of ZG06Cr16Ni5Mo brand to the chemical composition of the original standard: Add the requirements for ZG06Cr16Ni5Mo material to the mechanical property requirements of the original standard, and uniformly modify the hardness values of the original materials to ≥221HBS:
Remove the mechanical property requirements in Table 2 of the original standard The Axu value is removed, and the notes in the table are also removed: The inspection method of the original standard blade profile is re-specified, and the blade thickness measurement is regulated: The surface quality requirement is changed from "the surface roughness of the casting should meet the requirements of flaw detection" to "the surface roughness of the casting R, ≤50μm, and the surface to be inspected should meet the requirements of flaw detection":
Add the normative appendix "Supplementary requirements for mechanical properties" (see Appendix B): The overall arrangement and structure of the standard are modified according to GB/T1.1-2000 "Guidelines for Standardization Work Part 1: Structure and Writing Rules of Standards".
Appendix A and Appendix B of this standard are normative appendices. This standard is proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of Deyang Large Castings and Forgings Research Institute. The drafting unit of this standard: China First Heavy Machinery Group Corporation. The main drafters of this standard: Zhao Xilin, Zhang Yacai, Chen Yuming. This standard was first issued in 1994.
1 Scope
Axial flow turbine stainless steel blade castings
JB/T7350-2002
This standard specifies the ordering requirements, technical requirements, test methods, inspection and acceptance rules for axial flow turbine stainless steel blade castings.
This standard applies to all kinds of integrally cast axial flow turbine stainless steel blades, and is the basis for the supplier to deliver them after rough or rough grinding or rough processing.
2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T222 Sampling method for chemical analysis of steel and GB/T223.3~78 Chemical analysis method for steel and alloy GB/T228 Metal tensile test method
GB/T229
GB/T231
GB/T6397
GB/T7233
GB/T9443
GB/T9444
Product composition allowable deviation
Metal Charpy notched impact test method (GB/T229-1994, eqvISO148:1983) Metal Brinell hardness test method
Metal tensile test specimen
Method for ultrasonic flaw detection and quality rating of steel castings (GB/T7233-1987, negBS6208:1982) Method for rating of flaws and defect indication marks of steel castings Magnetic particle flaw detection and quality rating of steel castings GB/T11352-General engineering carbon steel castings (GB/T11352-1989, neqISO3755:1975) 3 Ordering requirements
3.1 The purchaser shall specify the adopted standards, material grades, corresponding technical requirements, inspection items and other additional instructions in the order contract or 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 requirements and the number, location and size of the test blocks.
4 Technical requirements
4.1 Manufacturing
4.1.1 Refining
Blade steel shall be smelted in an electric arc furnace or a refining furnace. Other smelting methods may also be used with the consent of the purchaser. 4.12 Casting
Internal cooling iron shall not be used when casting blades, and process additions shall be removed before the final heat treatment. 4.13 Heat treatment
Castings shall be heat treated, and their performance heat treatment shall be normalizing plus tempering. 4.1.4 Welding repair
4.14.1 Welding repair of casting defects shall be carried out by qualified operators according to the welding repair process requirements before the final heat treatment of the castings, and the welding rod shall be similar to the material of the casting.
JB/T7350——2002
4.1.4.2 Defects with a depth exceeding 25mm or exceeding 20% of the wall thickness (if the casting thickness is less than 20mm, it is calculated as 20mm) or a single defect with an area exceeding 6500mm\ shall be regarded as major defects, and the welding repair of major defects shall be recorded. 4.1.4.3 Before welding repair, the defects shall be cleaned up and magnetic particle or color flaw detection shall be carried out to confirm that the defects are completely cleaned up. 4.1.4.4 After welding repair of major defects, stress relief heat treatment shall be carried out. The stress relief heat treatment temperature shall be lower than the tempering temperature during performance heat treatment. After the welding repair area is polished and smoothed, it shall be tested according to the original flaw detection standard to confirm that the welding repair quality is qualified. 4.1.5 Machining
4.1.5.1 When the purchaser requires, the supplier shall perform rough machining or rough grinding on the casting according to the order agreement. 4.1.5.2 The finishing and grinding allowances of castings shall be agreed upon by the supplier and the buyer. 4.2 Chemical composition
The mass fraction of chemical composition shall comply with the provisions of Table 1. When the buyer has no requirements, the residual elements in the steel shall not be used as the basis for acceptance. 4.3 Mechanical properties
The mechanical properties of castings shall comply with the provisions of Table 2. If the buyer has no special requirements for the hardness value, it shall not be used as the basis for acceptance. When the belt party requires low-temperature impact and bending tests, they shall comply with the provisions of Appendix B. Table 1 Mass fraction of chemical composition
Material brand
ZC06Cr13Ni4Mo
ZG06Cr13NiSMo
ZG06Cr13Ni6Mo
ZG06Cr16Ni5Mo
Note: Cu, W, V are residual elements.
Material grade
ZG06Cr13Ni4Mo
ZG06Cr13Ni5Mo
ZG06Cr13Ni6Mo
ZG06Cr16Ni5Mo
4.4 Casting quality
4.4.1 General requirements
≥750
≥785
≥550
≥588
11.5014.00
11.5014.0 0 | |tt | >35
0.40~1.00
0.40~1.00
0.40~1.00
0.40~1.00
≥>50Www.bzxZ.net
The surface of the casting should be cleaned and there should be no defects such as sand holes, pores, cracks, wrinkles, cold shuts, etc. 4.4.2 Surface quality
Casting surface roughness R, ≤50um. The surface roughness of the flaw detection surface should meet the flaw detection requirements. 4.4.3 Shape and size tolerance (only applicable to delivery after rough grinding)w
≥221
≥221
4.4.3.1 The shape and size tolerance of the casting should meet the requirements of the order drawings and agreements. The shape and size inspection of the blade casting is shown in Appendix A. In principle, the blade profile is tested using a theodolite or a three-coordinate measuring instrument. In the absence of conditions, a sample can also be used for testing after consultation between the two parties. The test section and requirements shall be carried out in accordance with the agreement between the supply and demand parties. 4.4.3.2 When measuring with a three-dimensional sample, the gap between the profile and the sample shall not exceed 0.002D (D is the nominal diameter of the runner, see Figure A.1). 4.4.3.3 The blade thickness deviation is (-0.04~+0.08)T+2mm (T is the pattern thickness at the measuring point). The location and number of measuring points shall be agreed upon by the supplier and the buyer. If the buyer does not have this requirement when placing an order, the thickness will not be measured. 2
JB/T7350—2002
4.4.3.4 The waviness of the front and back sides of the blade is expressed by the H/ value (L is the gap length, H is the maximum gap size within this length, see Figure A.2), and the H/ value should be less than 2%: the waviness of the back side that is prone to cavitation should be less than 1%. 4.4.3.5 The maximum allowable gap between the sample and the blade within 50mm of the front and back of the water inlet head is 1.5mm: the allowable deviation of the front and back of the other parts is ±0.0005D. 4.4.3.6 When the diameter of the runner is less than or equal to 3660mm, the edge thickness deviation of the water outlet is To; mm: When the diameter of the runner is greater than 3660mm, the edge thickness deviation of the water outlet is Tmm: The allowable deviation of the front and back profile is ±2mm. 4.4.4 Non-destructive testing
Castings should be subjected to ultrasonic skin and magnetic particle testing or color penetration testing. The inspection parts and acceptance quality levels shall be negotiated by the supply and demand parties when ordering.
5 Test methods and inspection rules
5.1 Chemical composition analysis
5.1.1 The chemical composition shall be checked for each furnace, and the analysis test block shall be prepared in the middle of the pouring. When multiple furnaces are poured together, the chemical composition shall be based on the "weighted" composition.
5.1.2 Chemical composition analysis Sampling and analysis methods shall comply with the provisions of GBT222 and GB/T223.3~78. 5.2 Mechanical properties test
5.2.1 Shape and size
The shape and size of the test specimens for mechanical properties test shall comply with the provisions of GB/T6397. 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-cast test block shall comply with the provisions of GB/T11352. The location and method of the attached test block shall be agreed upon by both parties, but the thickness of the test block shall not be less than 28mm. 522 Tensile and impact
Take one tensile test specimen and three impact test specimens from the same smelting furnace (multiple furnaces should be regarded as the same smelting furnace) and the same heat treatment furnace test block. The impact test result shall be the average value (arithmetic mean) of three specimens, and the average value shall comply with the provisions of Table 2. Among the three 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 GB/T228, and the impact test shall be carried out in accordance with the provisions of GB/T229. 5.2.3 Hardness
Hardness is measured on the specimen, and the hardness test shall be carried out in accordance with the provisions of GB/T231. 5.2.4 Bending
The determination method of the bending test is shown in Appendix B.
52.5 Retest and reheat treatment
Retest is allowed when the mechanical properties test results are unqualified. Double specimens shall be prepared for the retest of the tensile test and the bending test. If the test results are all in accordance with the provisions of Table 2 and Appendix B, they can be judged as qualified: if one of the test results is unqualified, the casting represented by it shall be reheat treated together with the test block. Three specimens shall be prepared for the retest of the impact test, and the value of each sample of the retest shall be equal to or exceed the specified minimum average value. Otherwise, the castings it represents together with the test blocks shall be reheat treated. The number of reheat treatments of castings and test blocks shall not exceed two times (excluding stress relief heat treatment). If the test results are still unqualified, the batch of castings shall be scrapped.
5.3 Non-destructive testing
When castings are delivered after rough machining or rough grinding and the purchaser requires non-destructive testing, the supplier shall conduct non-destructive testing on the castings. 5.3.1 Magnetic particle testing or coloring testing
The magnetic particle testing of casting surface shall be carried out in accordance with the provisions of GB/T9444. The penetration testing shall be carried out in accordance with the provisions of GB/T9443. 53.2 Ultrasonic testing
The ultrasonic testing of castings shall be carried out in accordance with the provisions of GB/T7233. 3
JB/T7350—2002
Quality certificate
At the time of delivery, the supplier must provide the purchaser with a quality certificate, which should include the following contents:a)
Order contract number:
Order drawing number:
Casting name:
Product material brand:
Standard number:
Smelting furnace number, part number:
Product weight:
Chemical composition analysis results:
Mechanical properties test results;
Non-destructive test results:
Main defect welding repair record (including location and size sketch): Blade profile dimension inspection record:
Other additional test results.
Marking and packaging
The supplier shall mark each blade casting with the contract number, furnace number, part number, etc. and circle them with white paint. The supplier shall package according to the transportation conditions. 3 Painting of the casting surface is not allowed.
Appearance inspection
Appendix A
(Normative appendix)
Shape and size inspection of blade castings
The blade shape is inspected using the three-dimensional sample shown in Figure A.1. The sample and instructions for use shall be provided by the purchaser. Limit
Water inlet reaches
A.2 Inspection of surface waviness
Figure A.1 Three-dimensional sample
Water outlet
JB/T7350-2002
A.2.1 The waviness is generally checked with a 1m long flexible ruler parallel to the water flow direction (tangential) and perpendicular to the water flow direction (radial), see Figure A.2. A.2.2 During the inspection, stick the flexible ruler on the blade surface so that the surface of the ruler conforms to the smooth curved surface of the blade. When measuring one surface and then the adjacent surface, the overlap between the flat ruler and the previous curved surface shall not be less than 150mm. If the length of the flat ruler used is shorter than 650mm due to site constraints, the front and rear overlaps should be greater than 10% of the ruler length during the inspection. Bendable ruler
Vertical direction of water flow
Expand
Blade surface
Figure A.2 Waviness inspection
JB/T7350—2002
A.3 Inspection of the head profile of the water inlet side and the water outlet side A.3.1 The head profile of the water inlet side is inspected with the sample shown in Figure A.3. When the three-dimensional sample shown in Figure A.1 is used to inspect the blade shape, the water inlet side sample is configured according to the section to be measured.
A.3.2 The water outlet side profile is inspected with the sample shown in Figure A.3. The number of samples is determined by the purchaser. Head
Water outlet
R-10%T(Assume R
3 Water inlet and outlet inspection sample
This appendix is only used when the purchaser requires it. B.1
Impact value at low temperature
Appendix B
(Normative appendix)
Supplementary requirements for mechanical properties
The impact value of the material grades listed in this standard at 0℃ should be Akv≥21J. B.2 Bending test
B.2.1 The size of the specimen is 150mmx25mmx13mm, and the edge of the specimen can be trimmed to a radius of no more than 1.6mm. B.2.2
JB/T7350—2002
The specimen should withstand longitudinal bending at 90℃ at room temperature. Bend center The diameter is 25mm. There should be no cracks on the outside of the bending part of the specimen. People's Republic of China
Mechanical Industry Standard
Axial Flow Turbine Stainless Steel Blade Casting
JB/T7350-2002
Published and distributed by Machinery Industry Press
No. 22 Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mm×1240mm
1/16·1 Printing Sheet·19,000 Words
1st Edition, 1st Printing, April 2003
Price: 14.00 yuan
Book Number: 15111·7186
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