This standard specifies the thermal stability test method for steam turbine main shaft and rotor forgings of steam turbine generator sets. This standard is applicable to the determination of thermal stability of steam turbine main shaft and rotor forgings to ensure their stable operation at operating temperature. JB/T 9021-1999 Thermal Stability Test Method for Steam Turbine Main Shaft and Rotor Forgings JB/T9021-1999 Standard Download Decompression Password: www.bzxz.net

16S 77.140.85
Machinery Industry Standard of the People's Republic of China
JB/T 9021-1999
Test method for heat stability ofsteam tarbine shafts and rotor forgings1999-06-28Promulgated
National Machinery Industry Bureau
Implementation on 2000-01-01
5B7T9021-1999
This standard is equivalent to ASTMA472-74 (1V79 Standard) "Test method for heat stability of steam tarbine shafts and rotor forgings", which is a revision of ZBJ32005-88 "Test method for heat stability of steam tarbine shafts and rotor forgings". This standard has the following important technical contents compared with the previous standard: clearly stipulate the test strip and test point standard: - increase the width of the test strip surface roughness requirements. This standard replaces 2B13205 from the implementation date. The standard was proposed and managed by Deyang Heavy Forgings Research Institute. The responsible unit for this standard: First Heavy Machinery Group Co., Ltd. The main contributors of this standard: Zhang Mingsuwww.bzxz.net
[Scope
Machinery Industry Standards of the People's Republic of China
Test method for thermal stability of steam turbine main shaft and rotor forgings
Test method for thermal stability of steam turbine main shaft and rotor forgings steam turbine shats and rotor forgings This standard specifies the thermal stability test method JB/T9021-1999 for steam turbine generator sets
This standard uses the qualitative determination of steam turbine main shaft and rotor forgings to ensure the stable operation under the operating temperature. 2. Also use the condition
When the purchaser completes the thermal stability test, the minimum temperature specified in the design drawing 1 for the thermal stability test shall be used, and the net sample shall be reported! The parts to be tested shall be marked with the number and position of the test belt. The parts shall be placed in the designated hot chamber. 3. Preparation before the test
3.1 Stability belt
3.1.1 The manufacturer shall print and mark points A, B, C, and D 90° apart on the periphery of the part near the end. During the chain operation, the markings shall remain unchanged. 3.1.2 When the length of the forging is greater than 7.5m, at least five inspection strips shall be provided. Scan and print the serial numbers 1, 2, 3, and 4 from the edge of the forging drawing. The parts shall be machined out at both ends of the forging and tested. Test belts 1 and 5 shall be placed near the ends of the forging. Test belts 3 shall be as long as possible, and test belts 2 and 4 shall be located approximately equidistant from: 3 and 3 and 5 respectively. When there is no cross-test, the test 2-4 can be omitted. The test result is mm, and the roughness of the test surface is R1. 3.1.3 The most important part is to use the page inflammation meaning to wait for the rotation: use the work belt and the style test, forging parts or more? Use the centering frame to support the rotation forging meter, and the machine is added and the reading test is carried out: the enterprise is to test the number of times, and the excited parts can be rotated on the bull's heart frame: 3.2 Surface elimination
Before the heat stability test of the parts: the grease, dirt and other foreign matter on the surface should be removed, 3.3 Heating and cooling
3.3.1 Put the silver transfer effect in the pen--and rotate the parts at a speed of 2-4m. 3.3.2 Put the thermoelectric transfer person in the heat and connect the various test parts with the oil plated parts. 3.3.3 The heating should be uniform to avoid overheating of parts. The forgings should be heated at a temperature not exceeding 11°C to the rated thermal stability of the test piece. Deep heat should be applied to the test temperature until the forging is heated evenly. 3.3. The test temperature should be measured once every hour. If the value of the test is within c.0127m after consecutive measurements, the part can be considered to have reached the uniform test state. In this test temperature, measure once every hour. Note that the readings of the output heat measured each time must be consistent. The Ministry of Machinery Industry approved the implementation of 2000-101 in 1999-16-2H. 189021-1999 3.3. When the test quantity described in 1.3.4 is reached, cool the forging to below 38°C. The heating chamber can be opened during cooling. The cover shall not be removed before the forging temperature drops to less than 20°C. After the forging has cooled to the nearest air conditioner, the forging shall be rotated for at least 2h. The secondary cooling test data can be recorded. 4 Test procedure and test method 4.1 Test procedure 4.1.1 The qualitative test of heat transfer shall be carried out on the forging. The test is carried out after the center hole is punched and the final heat treatment is carried out in the factory: if the factory does not have the conditions, the test can also be carried out at the purchaser's side.
4.1.2 If the purchaser agrees in advance, the forging stress elimination can be used as part of the thermal stability test. In this way, the stress elimination is 28-5.59 lower than the tempering temperature. The parts are rotated at a speed of 2-4rmm. The stress elimination insulation time is calculated according to the maximum warp thickness. It is at least 2h/254mm. Then the temperature is released to the specified thermal stability test temperature and then the test is carried out. 4.2 Force test method
4.2.! The micrometer used to measure the heat of the general parts outdoors is used to heat the outdoor. The deviation value is close to 0.0127m as positive. Use it, seal the meter, and first connect one end of the stylus to the The test strips on the carrier are connected. Four points, A, B, C, D, should be measured on each test strip. The T meter can be reduced to zero at the smallest point A, B, C or center of each test strip, or the measured value can be reduced to the minimum by the force reduction method. 4.1.2 First cooling: Measure each test strip after the start of rotation and before heating. If the radial movement of any test strip exceeds 0.050mm, continue to rotate for 1h: If the radial movement still exceeds 0.50mm, the forgings should be re-centered, and the weight should be 51 to measure the normal, until the radial movement of any test strip does not exceed 0.05m. The last test is the official test.
1.2.3 Thermal measurement: When the forging is heated, use a thermocouple to measure once every hour All test strips shall be subjected to the specified test temperature until the test temperature is reached. At the specified temperature, if the continuous measured values ​​are within 0.0127 mm once every hour, cooling can be started. The last test in the second test shall be regarded as the first test.
4.2.4 Second cold test: After the cooling period is 33.5, all test strips shall be tested every 0.5 hours. If the continuous measured values ​​are within 0.0127 mm, the test strips shall be regarded as the formal second cold test. 5 Acceptance
5.1 When the difference between the formal hot test value and the formal second cold test value of the test point on each test strip of the product does not exceed 0.05 mm, it shall be accepted. The core value of each test strip shall be determined as follows. 5.1.1 Subtract the formal hot test value at point A from the formal second cold test value at point A. S.1.2 The same method is used for each point B, C, and D. 5.1.3 The pressure measurement results of this point are respectively considered as the maximum positive value and the maximum negative value. For any test zone, the maximum value exceeds 0.5amm
5.1.4 If there is a change in the values ​​of test zones 1 and 5, appropriate corrections can be made based on the results of tests 2, 3, and 4. The correction stop value should be within the required range of 5.1.3
5? If the requirements of your qualitative test are not met, you can retest. Before retesting, the forging can be removed or the whole heat treatment process can be repeated. The test report should include the following contents: JI/T9021-1999 Forging name, production grade, material, size, unit and abbreviation of the commissioned test; Test standard and conditions: Test results and conclusions (the first cold measurement value, the heating measurement value within the specified temperature range at the temperature measured every hour, the formal second cold measurement value and the temperature of the equipment when these measurement values ​​are not obtained, and the calculation method of the measured values ​​in 5.1.3)! Test date, tester and tester's name.
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