JB/T 7349-2002 Francis turbine welded runner stainless steel blade castings
Some standard content:
ICS 77.140.80
Machinery Industry Standard of the People's Republic of China JB/T7349—2002
Replaces JB/T7349—1994
Stainless steel blade castings for welded construction runner for Francis hydraulic turbines
2002-12-27 Issued
2003-04-01 Implementation
Issued by the State Economic and Trade Commission of the People's Republic of China Foreword.
Normative references
Ordering requirements
Technical requirements
Manufacturing,
Chemical composition,
Mechanical properties.
Casting quality
5 Test methods and inspection rules
Chemical composition analysis,
Mechanical properties test
Non-destructive testing
6 Quality certificate
7 Marking and packaging
Appendix A (Normative Appendix) Supplementary requirements for mechanical properties Figure 1 Waviness inspection.
Table 1 Mass fraction of chemical composition
Table 2 Mechanical properties,
+中中-,
++++++++-+
JB/T 7349--2002
+.---+--+----+++
This standard replaces JB/T7349-1994 "Francis turbine welded runner stainless steel blade castings". Compared with JB/T7349-1994, the main changes of this standard are as follows: JB/T 7349-2002
Change the delivery method of the original standard from "delivery after rough grinding" to "delivery after rough or rough grinding or rough processing" Change the "final heat treatment is normalizing and tempering" in the heat treatment item of the original standard to "its performance heat treatment is normalizing and tempering" Remove the Axu value from the mechanical property requirements in Table 2 of the original standard, and remove the notes in the table at the same time, and unify the hardness value to ≥221HBS: Change the surface quality requirements of the original standard from "casting surface roughness should meet the requirements of flaw detection" to "casting surface roughness R≤50μm. The surface roughness of the surface to be inspected should meet the requirements of flaw detection: Change the contents of 4.4.3.2 and 5.4.3 of the original standard to "In principle, the blade profile should be inspected using a theodolite or a three-coordinate measuring instrument. If the conditions are not met, a sample can also be used for inspection. The inspection section and requirements shall be carried out according to the agreement between the supply and demand parties. "; - Added the normative appendix "Supplementary requirements for mechanical properties" (see Appendix A): The overall arrangement and structure of the standard were modified according to GB/T1.1--2000 "Guidelines for Standardization Work Part 1: Structure and Writing Rules of Standards".
Appendix A of this standard is a normative appendix.
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 is China Second Heavy Machinery Group Corporation. The main drafter of this standard is Tian Suzhen.
This standard was first issued in 1994.
1 Scope
Français turbine welded runner stainless steel blade castings JB/T 7349—2002
This standard specifies the ordering requirements, technical requirements, test methods and inspection rules for welded runner stainless steel blade castings of Francis turbines.
This standard applies to the ordering, manufacturing and inspection of welded runner stainless steel blades of Francis turbines of various specifications, and is the basis for the supplier to deliver the raw materials after 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 allowable deviation of chemical composition of finished products GB/T223.378 Chemical analysis method of steel and alloy GB/T228 Metal tensile test method
GB/T 229
GB/T231
GB/T 6397
Metal Charpy notch impact test method (GB/T229--1994, eqvISO148:1983)Metal Brinell hardness test method
Metal tensile test specimen
GB/T7233
GB/T 9443
GB/T9444
Methods for ultrasonic flaw detection and quality rating of steel castings (GB/T7233-1987, neqBS6208:1982)Methods for rating of penetrant flaw detection and defect indication marks of steel castingsMagnetic particle flaw detection and quality rating of steel castingsGB/T11352-1989, neqISO3755:1975)3Ordering 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
The steel for blades 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. 4.1.2 Casting
Internal cooling iron is not allowed to be used during casting, and process additions shall be removed before the final heat treatment. 4.1.3 Heat treatment
Castings shall be heat treated, and their performance heat treatment is normalizing plus tempering. 4.1.4, Welding repair
4.1.4.1 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; the welding rod shall be similar to the material of the casting.
JB/T7349--2002
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 with an area exceeding 6500mm2 shall be regarded as major defects, and 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 inspected 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 has requirements, the supplier shall perform rough machining or rough grinding on the castings according to the order agreement. 4.1.5.2 The allowance for finishing and finishing grinding of castings shall be agreed upon by the supplier and the purchaser. 4.2 Chemical composition
The mass fraction of the chemical composition of the castings shall comply with the provisions of Table 1. When the purchaser has no requirements, the residual elements shall not be used as the basis for acceptance. 4.3 Mechanical properties
The mechanical properties of the castings shall comply with the provisions of Table 2. The hardness value shall not be used as the basis for acceptance if the purchaser has no special requirements. When the purchaser requires low-temperature impact and bending tests, it shall comply with the provisions of Appendix A. Mass fraction of chemical composition
Material grade
ZG06Cr13Ni4Mo
ZG06Cr13NiSMo
ZG06C113Ni6Mo
ZG06Cr16Ni5Mo
N1.00 — M1.00
Note: Cu, W, V are residual elements.
Material grade
ZG06Cr13Ni4Mo
ZG06Cr13Ni5Mo
ZG06Cr13Ni6Mo
ZG06Cr16NiSMo
4.4 Casting quality plate
≥750
≥785
11.50~14.00
11,50-14.00
12.00~14 .00
15.50~17.50
Table 2 Mechanical properties
≥550
5.50~6.50
4.50~6.00
0.40~1.00
0.40~1.00
0.40~1.00
4.4.1 General requirements
The casting surface should be cleaned and there should be no defects such as sand holes, pores, cracks, cold shuts, etc. 4.4.2 Surface quality
The surface roughness of the casting is R.≤50 um. The surface roughness of the surface to be inspected shall meet the inspection requirements. Cu
≥221
≥221
4.4.3 Tolerance of shape and size (only applicable to delivery after rough grinding)4.4.3.1 The shape and size of the casting shall meet the requirements of the order drawing. In principle, the blade profile is tested using a theodolite or a three-coordinate measuring instrument. If the conditions are not met, a sample plate 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 sample plate, the gap between the sample plate and the blade profile shall be less than or equal to 0.002D (D is the nominal diameter of the runner), and the blue point is only allowed to exceed the tolerance of 0.003D.
4.4.3.3 The allowable deviation of the blade inlet and outlet water edge profile is 0.001D. 4.4.3.4 The allowable deviation of blade thickness is (0.04～+0.08)T+2mm (T is the pattern thickness of the measuring point). The position 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/T 7349—2002
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 of the back side should be less than 1%. The waviness is checked with a one-meter flexible ruler parallel to the direction of the water flow and perpendicular to the direction of the water flow, see Figure 1. For small and medium-sized turbine blades, the length of the flexible ruler used should not be shorter than 1/2 of the chord length of the airfoil. When checking, place the flexible ruler on the surface of the blade 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 flexible ruler and the previous curved surface shall not be less than 150mm: If the site is limited, when the length of the flexible ruler is shorter than 650mm, the overlap between the front and rear shall not be less than 10% of the ruler length. Flexible ruler
Blade fur surface
Figure 1 Waviness inspection
4.4.4 Non-destructive inspection
When the casting is delivered after rough machining or rough grinding and the purchaser requires non-destructive inspection, the supplier shall conduct ultrasonic inspection and magnetic particle inspection or coloring inspection on the casting. The inspection location and acceptance quality level shall be negotiated by the supplier and the purchaser when placing an order. 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 GB/T222 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 size of the attached cast test block shall be agreed upon by both parties, but the thickness of the test block shall not be less than 28mm. 5.2.2 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 is 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 A.
5.2.5 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 A, 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 retested specimen 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 Nondestructive testing
5.3.1 Magnetic particle testing or coloring testing
Magnetic particle testing of casting surfaces shall be carried out in accordance with the provisions of GB/T9444. Coloring testing shall be carried out in accordance with the provisions of GB/T9443. 5.3.2 Ultrasonic testing
Ultrasonic testing of castings shall be carried out in accordance with the provisions of GB/T7233. 6 Quality Certificate
When delivering, the supplier must provide the purchaser with a quality certificate, which shall include the following contents: a)
Order contract number:
Order drawing number:
Casting name: bzxz.net
d) Product material brand:
Standard number:
Melting 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): k)
Blade profile dimension inspection record:
m) Other additional test results.
7 Marking and packaging
7.1 The supplier shall mark each blade casting with the contract number, furnace number, part number, etc., and circle it with white paint. 7.2 The supplier shall pack according to the requirements of transportation conditions. 7.3 The casting surface shall not be painted.
This supplementary requirement shall only be used when the purchaser requires it. A.1 Impact value at low temperature
Appendix A
(Normative Appendix)
Supplementary requirements for mechanical properties
The impact value of the material grades listed in this standard at 0℃ shall be Akv≥21J. A.2 Bending test
JB/T 7349—2002
A.2.1 The size of the specimen is 150mmx25mmx13mm, and the edge of the specimen can be rounded to a radius of no more than 1.6mm. A.2.2 The specimen shall be subjected to 90° longitudinal bending at room temperature. The diameter of the bending center is 25mm. There shall be no cracking on the outside of the bending part of the specimen. Silver of the People's Republic of China
Mechanical Industry Standard
Français turbine welded runner stainless steel blade castings JB/T 7349—2002
Published and distributed by Machinery Industry Press
No. 22 Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mn×1240mn
1/16·0.75 printing sheet·15,000 words
1st edition, 1st printing, April 2003
Book number: 15111·7185
Website: http://cmpbook.comEditorial Department Tel: (010) 88379779
Direct Sales Center Tel:
(010) 88379693
All covers without anti-counterfeiting labels are pirated
Copyright reserved
Infringements will be prosecuted5 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 side should be less than 1%. The waviness is checked with a one-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 should not be shorter than 1/2 of the airfoil chord length. When checking, place the flexible ruler on the surface of the blade 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 of the flexible ruler with the previous curved surface shall not be less than 150mm: if the site is limited, when checking with a flexible ruler shorter than 650mm, the front and rear overlaps shall not be less than 10% of the ruler length. Wire drawing
Blade fur surface
Figure 1 Waviness inspection
4.4.4 Nondestructive inspection
When castings are delivered after rough machining or rough grinding and the purchaser requires nondestructive inspection, the supplier shall conduct ultrasonic inspection and magnetic particle inspection or coloring inspection on the castings. The inspection parts and acceptance quality level shall be negotiated by the supplier and the purchaser when placing an order. 5 Test methods and inspection rules
5.1 Chemical composition analysis
5.1.1 The chemical composition shall be inspected furnace by furnace, and the analysis test block shall be prepared in the middle of 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 GB/T222 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 size of the attached cast test block shall be agreed upon by both parties, but the thickness of the test block shall not be less than 28mm. 5.2.2 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 the three test specimens, and the average value shall comply with the provisions of Table 2. Among the three impact test specimens, only one test 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 test specimen, and the hardness test is carried out in accordance with the provisions of GB/T231. 5.2.4 Bending
For the determination method of bending test, see Appendix A.
5.2.5 Retest and re-heat treatment
When the mechanical properties test results are unqualified, retest is allowed. For the retest of tensile test and bending test, double specimens shall be prepared. If the test results meet the requirements of Table 2 and Appendix A, they can be judged as qualified; if one of the test results is unqualified, the casting represented by it and the test block shall be re-heat treated. For the retest of impact test, three specimens shall be prepared, and the value of each retested specimen shall be equal to or exceed the specified minimum average value. Otherwise, the casting represented by it and the test block shall be re-heat treated. The number of re-heat treatments of castings and test blocks shall not exceed two times (stress relief heat treatment is not counted). If the test result is still unqualified, the batch of castings shall be scrapped.
5.3 Nondestructive testing
5.3.1 Magnetic particle testing or coloring testing
Magnetic particle testing of casting surface shall be carried out in accordance with the provisions of GB/T9444. Coloring testing shall be carried out in accordance with the provisions of GB/T9443. 5.3.2 Ultrasonic testing
Ultrasonic testing of castings shall be carried out in accordance with the provisions of GB/T7233. 6 Quality Certificate
When delivering, the supplier must provide the purchaser with a quality certificate, which shall include the following contents: a)
Order contract number:
Order drawing number:
Casting name:
d) Product material brand:
Standard number:
Melting 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): k)
Blade profile dimension inspection record:
m) Other additional test results.
7 Marking and packaging
7.1 The supplier shall mark each blade casting with the contract number, furnace number, part number, etc., and circle it with white paint. 7.2 The supplier shall pack according to the requirements of transportation conditions. 7.3 The casting surface shall not be painted.
This supplementary requirement shall only be used when the purchaser requires it. A.1 Impact value at low temperature
Appendix A
(Normative Appendix)
Supplementary requirements for mechanical properties
The impact value of the material grades listed in this standard at 0℃ shall be Akv≥21J. A.2 Bending test
JB/T 7349—2002
A.2.1 The size of the specimen is 150mmx25mmx13mm, and the edge of the specimen can be rounded to a radius of no more than 1.6mm. A.2.2 The specimen shall be subjected to 90° longitudinal bending at room temperature. The diameter of the bending center is 25mm. There shall be no cracking on the outside of the bending part of the specimen. Silver of the People's Republic of China
Mechanical Industry Standard
Français turbine welded runner stainless steel blade castings JB/T 7349—2002
Published and distributed by Machinery Industry Press
No. 22 Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mn×1240mn
1/16·0.75 printing sheet·15,000 words
1st edition, 1st printing, April 2003
Book number: 15111·7185
Website: http://cmpbook.comEditorial Department Tel: (010) 88379779
Direct Sales Center Tel:
(010) 88379693
All covers without anti-counterfeiting labels are pirated
Copyright reserved
Infringements will be prosecuted5 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 side should be less than 1%. The waviness is checked with a one-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 should not be shorter than 1/2 of the airfoil chord length. When checking, place the flexible ruler on the surface of the blade 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 of the flexible ruler with the previous curved surface shall not be less than 150mm: if the site is limited, when checking with a flexible ruler shorter than 650mm, the front and rear overlaps shall not be less than 10% of the ruler length. Wire drawing
Blade fur surface
Figure 1 Waviness inspection
4.4.4 Nondestructive inspection
When castings are delivered after rough machining or rough grinding and the purchaser requires nondestructive inspection, the supplier shall conduct ultrasonic inspection and magnetic particle inspection or color inspection on the castings. The inspection location and acceptance quality level shall be negotiated by the supplier and the purchaser when placing an order. 5 Test methods and inspection rules
5.1 Chemical composition analysis
5.1.1 The chemical composition shall be inspected furnace by furnace, and the analysis test block shall be prepared in the middle of 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 GB/T222 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 size of the attached cast test block shall be agreed upon by both parties, but the thickness of the test block shall not be less than 28mm. 5.2.2 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 the three test specimens, and the average value shall comply with the provisions of Table 2. Among the three impact test specimens, only one test 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 test specimen, and the hardness test is carried out in accordance with the provisions of GB/T231. 5.2.4 Bending
For the determination method of bending test, see Appendix A.
5.2.5 Retest and reheat treatment
When the mechanical property test results are unqualified, retest is allowed. For the retest of tensile test and bending test, double specimens shall be prepared. If the test results meet the requirements of Table 2 and Appendix A, they can be judged as qualified; if one of the test results is unqualified, the casting represented by it and the test block shall be reheat treated. For the retest of impact test, three specimens shall be prepared, and the value of each retested specimen shall be equal to or exceed the specified minimum average value. Otherwise, the casting represented by it and the test block shall be reheat treated. The number of reheat treatments of castings and test blocks shall not exceed two times (stress relief heat treatment is not counted). If the test result is still unqualified, the batch of castings shall be scrapped.
5.3 Nondestructive testing
5.3.1 Magnetic particle testing or coloring testing
Magnetic particle testing of casting surface shall be carried out in accordance with the provisions of GB/T9444. Coloring testing shall be carried out in accordance with the provisions of GB/T9443. 5.3.2 Ultrasonic testing
Ultrasonic testing of castings shall be carried out in accordance with the provisions of GB/T7233. 6 Quality Certificate
When delivering, the supplier must provide the purchaser with a quality certificate, which shall include the following contents: a)
Order contract number:
Order drawing number:
Casting name:
d) Product material brand:
Standard number:
Melting 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): k)
Blade profile dimension inspection record:
m) Other additional test results.
7 Marking and packaging
7.1 The supplier shall mark each blade casting with the contract number, furnace number, part number, etc., and circle it with white paint. 7.2 The supplier shall pack according to the requirements of transportation conditions. 7.3 The casting surface shall not be painted.
This supplementary requirement shall only be used when the purchaser requires it. A.1 Impact value at low temperature
Appendix A
(Normative Appendix)
Supplementary requirements for mechanical properties
The impact value of the material grades listed in this standard at 0℃ shall be Akv≥21J. A.2 Bending test
JB/T 7349—2002
A.2.1 The size of the specimen is 150mmx25mmx13mm, and the edge of the specimen can be rounded to a radius of no more than 1.6mm. A.2.2 The specimen shall be subjected to 90° longitudinal bending at room temperature. The diameter of the bending center is 25mm. There shall be no cracking on the outside of the bending part of the specimen. Silver of the People's Republic of China
Mechanical Industry Standard
Français turbine welded runner stainless steel blade castings JB/T 7349—2002
Published and distributed by Machinery Industry Press
No. 22 Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mn×1240mn
1/16·0.75 printing sheet·15,000 words
1st edition, 1st printing, April 2003
Book number: 15111·7185
Website: http://cmpbook.comEditorial Department Tel: (010) 88379779
Direct Sales Center Tel:
(010) 88379693
All covers without anti-counterfeiting labels are pirated
Copyright reserved
Infringements will be prosecuted5 Retest and reheat treatment
Retest is allowed when the mechanical properties test results are unqualified. For the retest of tensile test and bending test, double specimens shall be prepared. If the test results meet the requirements of Table 2 and Appendix A, they can be judged as qualified; if one of the test results is unqualified, the casting represented by it and the test block shall be reheat treated. For the retest of impact test, three specimens shall be prepared. The value of each retested specimen shall be equal to or exceed the specified minimum average value. Otherwise, the casting represented by it and the test block shall be reheat treated. The number of reheat treatments of castings and test blocks shall not exceed two times (stress relief heat treatment is not counted). If the test results are still unqualified, the batch of castings shall be scrapped.
5.3 Nondestructive testing
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. Color inspection shall be carried out in accordance with the provisions of GB/T9443. 5.3.2 Ultrasonic inspection
Ultrasonic inspection of castings shall be carried out in accordance with the provisions of GB/T7233. 6 Quality certificate
At the time of delivery, the supplier must provide the purchaser with a quality certificate, which shall include the following contents:a)
Order contract number:
Order drawing number:
Name of casting:
d) 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):k)
Blade profile dimension inspection record:
m) Other additional inspection results.
7 Marking and packaging
7.1 The supplier shall mark each blade casting with the contract number, furnace number, part number, etc. and circle them with white paint. 7.2 The supplier shall package according to the transportation conditions. 7.3 The casting surface is not allowed to be painted.
This supplementary requirement is only used when the purchaser requires it. A.1 Impact value at low temperature
Appendix A
(Normative Appendix)
Supplementary requirements for mechanical properties
The impact value of the material grades listed in this standard at 0℃ shall be Akv≥21J. A.2 Bending test
JB/T 7349—2002
A.2.1 The size of the specimen is 150mmx25mmx13mm, and the edge of the specimen can be rounded to a radius of no more than 1.6mm. A.2.2 The specimen shall withstand a 90° longitudinal bending at room temperature. The diameter of the bend is 25mm. There should be no cracks on the outside of the bend of the specimen. Silver of the People's Republic of China
Mechanical Industry Standard
Français Turbine Welded Runner Stainless Steel Blade Casting JB/T 7349-2002
Published and distributed by Machinery Industry Press
No. 22 Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mn×1240mn
1/16·0.75 Printing Sheet·15,000 Words
1st Edition, 1st Printing, April 2003
Book Number: 15111·7185
Website: http://cmpbook.comEditorial Office Tel: (010) 88379779
Direct Sales Center Tel:
(010) 88379693
All covers without anti-counterfeiting labels are pirated
Copyright reserved
Infringements will be prosecuted5 Retest and reheat treatment
Retest is allowed when the mechanical properties test results are unqualified. For the retest of tensile test and bending test, double specimens shall be prepared. If the test results meet the requirements of Table 2 and Appendix A, they can be judged as qualified; if one of the test results is unqualified, the casting represented by it and the test block shall be reheat treated. For the retest of impact test, three specimens shall be prepared. The value of each retested specimen shall be equal to or exceed the specified minimum average value. Otherwise, the casting represented by it and the test block shall be reheat treated. The number of reheat treatments of castings and test blocks shall not exceed two times (stress relief heat treatment is not counted). If the test results are still unqualified, the batch of castings shall be scrapped.
5.3 Nondestructive testing
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. Color inspection shall be carried out in accordance with the provisions of GB/T9443. 5.3.2 Ultrasonic inspection
Ultrasonic inspection of castings shall be carried out in accordance with the provisions of GB/T7233. 6 Quality certificate
At the time of delivery, the supplier must provide the purchaser with a quality certificate, which shall include the following contents:a)
Order contract number:
Order drawing number:
Name of casting:
d) 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):k)
Blade profile dimension inspection record:
m) Other additional inspection results.
7 Marking and packaging
7.1 The supplier shall mark each blade casting with the contract number, furnace number, part number, etc. and circle them with white paint. 7.2 The supplier shall package according to the transportation conditions. 7.3 The casting surface is not allowed to be painted.
This supplementary requirement is only used when the purchaser requires it. A.1 Impact value at low temperature
Appendix A
(Normative Appendix)
Supplementary requirements for mechanical properties
The impact value of the material grades listed in this standard at 0℃ shall be Akv≥21J. A.2 Bending test
JB/T 7349—2002
A.2.1 The size of the specimen is 150mmx25mmx13mm, and the edge of the specimen can be rounded to a radius of no more than 1.6mm. A.2.2 The specimen shall withstand a 90° longitudinal bending at room temperature. The diameter of the bend is 25mm. There should be no cracks on the outside of the bend of the specimen. Silver of the People's Republic of China
Mechanical Industry Standard
Français Turbine Welded Runner Stainless Steel Blade Casting JB/T 7349-2002
Published and distributed by Machinery Industry Press
No. 22 Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mn×1240mn
1/16·0.75 Printing Sheet·15,000 Words
1st Edition, 1st Printing, April 2003
Book Number: 15111·7185
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