JB/T 7038-1993 Technical requirements for hydraulic isolated accumulator housing
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7038-1993
Hydraulic Isolated Accumulator
Shell Technical Conditions
Published on 1993-09-23
Ministry of Machinery Industry of the People's Republic of China
Implemented on 1994-07-01
Mechanical Industry Standard of the People's Republic of China
Hydraulic Isolated Accumulator
Shell Technical Conditions
Subject Content and Scope of Application
JB/T 7038-1993
This standard specifies the technical requirements, test methods and inspection rules for the hydraulic isolated accumulator shell (hereinafter referred to as the shell). This standard applies to accumulator shells with a nominal pressure of 6.3~63MPa, a nominal volume of 0.25-250L, an operating temperature of -10~70℃, and a petroleum-based hydraulic oil or emulsion as the working medium. 2
Cited standards
GB2106
GB5099
GB5777
GB6397
GB8162
JB3965
JB/T7034
JB/T 7035.1
JB/T7035.2
Symbols and units
Steel pressure vessels
Method for sampling samples for chemical analysis of steel and allowable deviation of chemical composition of finished productsMethods for chemical analysis of steel and alloys
Method for measuring the depth of decarburized layer in steel
Metal tensile test method
Metal bending test method
Metal Charpy (V-notch) impact test method Seamless steel gas cylinders
Ultrasonic testing method for seamless steel pipe
Metal tensile test specimen
Seamless steel pipe for structure
Magnetic particle testing of steel pressure vessel
Types and dimensions of hydraulic diaphragm accumulator
Types and dimensions of hydraulic bladder accumulator Type A
Types and dimensions of hydraulic bladder accumulator Type ABMicroscopic evaluation method for non-metallic inclusions in steel
Method for determining grain size of steel
Metallic Microstructure inspection method
Banded, Widmanstatten structure
Symbols and units are shown in Table 1
Approved by the Ministry of Machinery Industry on September 23, 1993
Implemented on July 1, 1994
Tensile strength
Yield strength
Elongation
Impact value
Measured minimum wall thickness
Calculated wall thickness
Burst pressure
Nominal pressure|| tt||Outer diameter of cylinder
Allowable stress
Corrosion allowance
Safety factor corresponding to tensile strength
Safety factor corresponding to service strength
Technical requirements
Type and size
JB/T7038-1993
The shell structure type and size shall comply with the provisions of JB/T7035.1, JB/T7035.2 and JB/T7034. Performance
The chemical composition of the shell material shall comply with the provisions of Table A1 in Appendix A (Supplement). The mechanical properties of the shell shall comply with the provisions of Table 2. Table 2
4g (V type, -20℃)
High-quality carbon steel
Not less than the guaranteed value of heat treatment by the manufacturer
Not less than the guaranteed value of heat treatment by the manufacturer
The metallographic structure and decarburized layer of the shell shall comply with the provisions of Table 3. Table 3
Non-metallic inclusions
Grain size (×100)
Decarburized layer
Banded structure
Widmanstätten structure
[0]≤Grade 3, [S]Grade 3
[O]+[S]≤Grade 5.5
Grade 5 or finer
Inner wall≤0.25, outer wall≤0.3
≤Grade 3
Unit name
Joule per square centimeter
4.2.4 The hardness value of the shell shall comply with the drawing requirements JB/T7038-1993
4.2.5 After the shell specimen is subjected to the cold bending test, there shall be no cracks or delamination on the bending surface. 4.2.6 After the pressure resistance test, there shall be no deformation or leakage of the shell. 4.2.7 After the shell is subjected to the burst test, the edge of the breach shall have an obvious shear lip, and the burst pressure shall not be less than the following calculated value. 28.ob
D. -Sa
4.3 Surface quality
4.3.1 The shell body and the shoulder shall be smoothly rounded, and defects such as oblique shoulders, edges, grooves, and wrinkles are not allowed. 4.3.2 After ultrasonic flaw detection, the defects on the inner and outer surfaces of the shell shall comply with the provisions of Class C5 in GB5777. Defects exceeding the provisions of the standard may be removed, but the minimum designed wall thickness must be guaranteed. 4.3.3 The results of magnetic particle flaw detection of the shell shall comply with the provisions of JB3965. 4.3.4 There shall be no cracks or delamination during the penetration flaw detection of the shell. 4.4 Dimensions and tolerances
4.4.1 The actual measured wall thickness of the shell shall not be less than the minimum designed wall thickness. 4.4.2 The processing dimensions, roundness, and straightness of each part of the shell shall comply with the requirements of the drawing. 5 Test methods
5.1 Material chemical composition analysis
5.1.1 The preparation of the material chemical composition analysis specimen shall comply with the provisions of GB222. 5.1.2 The material chemical composition analysis method shall comply with the provisions of GB223. 5.2 Shell mechanical properties test, metallographic structure inspection, cold bending test 5.2.1 The specimens for the shell mechanical properties test, metallographic structure inspection and cold bending test shall be cut according to the requirements of Appendix B (Supplement). 5.2.2 The size of the tensile test specimen shall comply with the provisions of GB6397. The tensile test method shall comply with the provisions of GB228. The size and test method of the impact test specimen shall comply with the provisions of GB2106. 5.2.3 The metallographic structure inspection shall comply with the provisions of YB28. The inspection of non-metallic inclusions shall comply with the provisions of YB25. The determination of grain size shall comply with the provisions of YB27. The determination of decarburized layer shall comply with the provisions of GB224. The evaluation of banded structure and Widmanstatten structure shall comply with the provisions of YB31.
5.2.4 The size and test method of the cold bending test specimen shall comply with the provisions of GB232, and the pressure head diameter shall be selected according to GB5099. 5.3 Pressure test
The pressure test includes hydraulic test and air pressure test. 5.3.1 The shells of bladder accumulators and type B diaphragm accumulators are subjected to hydraulic test. The hydraulic test generally uses water as the medium, and its temperature is: carbon steel shell, not less than 5℃ low alloy steel shell not less than 15℃. The test pressure is 1.5 times the nominal pressure. Clean the inside of the shell before filling. The pressure should be gradually increased during filling. If there is condensation on the outer surface of the metal after filling, it should be eliminated, and the pressure holding time should be not less than 3 minutes. 5.3.2 Air pressure test
The shells of type A and type C diaphragm accumulators are subjected to air pressure test. The test gas should be dry, clean air, nitrogen or other inert gas, the gas temperature should not be lower than 15℃, the test pressure should be 1.05 times the nominal pressure, the test should be slowly increased to the test pressure, and the pressure should be maintained for 10 minutes.
5.4 Explosion test
JB/T70381993
a: After the test piece passes the non-destructive test, the wall thickness of the test piece cylinder is measured with an ultrasonic thickness gauge (the number of measurement points should be such that the minimum wall thickness and pre-explosion zone can be determined), and the pre-explosion zone is determined and marked; b. Fill the test piece with water, connect it to the explosion test equipment, pressurize it to the nominal pressure, then reduce the pressure to zero, increase the pressure to the nominal pressure, and then reduce the pressure to zero, and the number of repetitions shall not be less than two times. Expel the gas in the test system c. Increase the pressure from zero until the shell ruptures, and record the water inflow and the corresponding pressure value; d. Evaluate the explosion results.
Note: The blasting test site should have reliable safety protection measures and be inspected and approved by the unit's safety department. During the test, no work unrelated to the test shall be carried out, and no irrelevant personnel shall stay at the test site. 5.5 Shell hardness value determination
The hardness determination position and measurement points of the shell cylinder of the bladder accumulator shall be in accordance with Table 4. The hardness value determination of the diaphragm accumulator shell shall comply with the drawing requirements.
Nominal volume L
63~100
100a-250
Cross section in the middle of the cylinder is 90° to each other
2 points are measured on each of the upper and lower cross sections of the cylinder, and the measuring points on the two cross sections are 90° to each other. 2 points are measured on each of the three cross sections of the cylinder, and the measuring points on the two cross sections are 90° to each other. 3 points are measured on each of the upper and lower cross sections of the cylinder, and the measuring points on the two cross sections are 60° to each other. 4 points are measured on each of the upper, middle and lower cross sections of the cylinder, and the measuring points on the two cross sections are 45° to each other. Number of measurement points
Note: ① The upper and lower cross sections refer to the two cross sections of the cylinder 50mm away from the transition between the two shoulders. The measuring points on each cross section are evenly distributed on the circumference. 1) The outer diameter of the shell is 229.
5.6 The minimum wall thickness of the shell is measured by an ultrasonic thickness gauge. 5.7 The shell ultrasonic flaw detection method shall comply with the provisions of GB5777. 5.8 The shell magnetic particle flaw detection method shall comply with the provisions of JB3965. 5.9 The shell penetration flaw detection method shall comply with the relevant provisions of GB150. Note: The manufacturing unit must carefully keep the original records of non-destructive testing, correctly fill in the report, and properly keep the negative film (including the original repair film) and data. The preservation period should not be less than 5 years.
Inspection rules
6.1 Factory inspection
6.1.1 The items to be inspected one by one are as follows: a. Type and size;
b. Ultrasonic flaw detection;
c. Shoulder shape;
d. Pressure test;
e: Dimensional tolerance, including cylinder wall thickness and various processing dimensions; f. Hardness (limited to fire + tempered shells); 4
JB/T 70381993
g. Magnetic particle inspection (limited to quenched + tempered shells). 6.1.2
See Table 5 for the items and sampling plan for random inspection by batch. Table 5
Inspection items
Chemical composition
Mechanical properties
Metallographic structure
Roundness, straightness
Sampling plan
1 piece per furnace
1 unit per batch
1 unit per batch
1 unit per batch
1 unit per batch
3 Shell batch: For shells with a nominal volume less than 1L, 500 units are specified as a batch; for shells with a nominal volume of 1.6~40L, 200 units are specified as a batch; for shells with a nominal volume greater than 40L, 100 units are specified as a batch. Those less than the batch quantity are still treated as a batch. 6.1.4
The inspection results of all items of unit-by-unit inspection shall comply with the provisions of the technical requirements. 6.1.5
If the inspection of the items of batch sampling fails, the unqualified items shall be re-inspected twice. If it is still unqualified, except for the unqualified items of roundness and straightness, which can be inspected and accepted unit by unit, if other items fail, the batch shall be deemed unqualified. Type inspection
Type inspection shall be carried out in any of the following situations. Finalization identification of new products or old products transferred to the factory for production; a.
b. When there are major changes in structure, materials, and processes that may affect product performance; when resuming production after a production interruption of more than one year; c.
d. When there is a major difference between the factory inspection results and the last type inspection: when the national quality supervision agency proposes to conduct type inspection. e.
Type inspection items
Type inspection items include all items in Article 6.1.1 of this standard and all spot inspection items in Article 6.1.2. 7 Marking
Each shell that passes the inspection shall be stamped with a steel stamp on its shoulder (inflatable valve end), and the contents of the steel stamp shall be arranged as shown in the figure below.
OOOOOO
Year and month of manufacture
Shell number
Nominal pressure, MPa
Nominal volume, L
Bladder type A, AB
Accumulator type
Diaphragm type A, B, C
Shell name
Bladder type: NXQ
Diaphragm type: GXQ
Manufacturer code
Pressure vessel inspection code
Shell material
JB/T7038-1993
Shell design
(Supplementary part)
The material used to manufacture the shell must be killed steel. The steel type should be high-quality carbon structural steel, chrome-molybdenum steel or other alloy steel. The shell material should have a quality certificate, and its chemical composition should not only meet the corresponding material standards, but also meet the requirements of Table A1. Table A1
Carbon structural steel
Alloy steel
Pipe material specifications, dimensions, geometric tolerances, internal and external surface quality and mechanical properties shall comply with the provisions of GB8162. Recommended materials are shown in Table A2.
Nominal pressure
Shell strength
Bladder shell
20, 35
20CrMo
30CrMo, 35CrMo, 30CrMnSiA
30CrMnTi, 35CrMnSiA
30CrMnSiNiA
The wall thickness of the shell of bladder accumulator is calculated according to formula (A1): body
20]+ p
The shell strength calculation of diaphragm accumulator shall comply with the relevant provisions of GB150. Determination of allowable stress
1 The safety factor is determined according to Table A3.
Calculate the allowable stress according to formula (A2) and formula (A3): A2.3.2
Diaphragm shell
ZG35II,16MnR
ZG35IⅡI,16MnR
ZG35CrMo
(Forging) 35CrMo
JB/T7038-1993
[o 6]= e
A2.3.3 Compare the size of [α] and [. ], and the smaller value is the allowable stress [α]. 4 The wall thickness corrosion allowance shall not be less than 0.5mm. A2.4
Ratio of yield strength to tensile strength (αl) A3.1
When normalizing, normalizing + tempering heat treatment specifications are adopted,. ,/α,≤0.75. When quenching + tempering heat treatment is adopted, 0a≤0.90. (A2)
JB/T70381993
Appendix B
Shell tensile test, impact test, cold bending test and metallographic inspection, specimen sampling position (supplement)
The sampling position of the bladder accumulator shell is shown in Figure B1. Impact test piece
Lifting test piece
Cold bending test piece
Note: ①Tensile and impact test pieces should be taken on the cylinder, 50mm away from the transition between the two shoulders; metallographic test pieces should be taken at the ends of the two spheres. ②Cold bending test pieces are half rings or 1/3~1/4 rings. B2
The diaphragm accumulator shell is sampled from the furnace sample, and the furnace sample must be the same as the shell remelted steel grade and manufacturing conditions. Additional Notes:
This standard was proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. This standard was drafted by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lai Yongzhi, Dai Xintian, Wang Shijie, and Hong Yanhong. People's Republic of China
Mechanical Industry Standard
Hydraulic Isolation Accumulator
Shell Technical Conditions
JB/T70381993
Published by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Sheet 3/4
Format 880×1230
Word Count 16,000
First Edition in May 1994
First Printing in May 1994
Print Quantity 1-500
Price 6.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_8504
The inspection results of all items of unit-by-unit inspection shall comply with the provisions of the technical requirements. 6.1.5
If the inspection of the items of batch sampling fails, the unqualified items shall be re-inspected twice. If it is still unqualified, except for the unqualified items of roundness and straightness, which can be inspected and accepted unit by unit, if other items fail, the batch shall be deemed unqualified. Type inspection
Type inspection shall be carried out in any of the following situations. Finalization identification of new products or old products transferred to the factory for production; a.
b. When there are major changes in structure, materials, and processes that may affect product performance; when resuming production after a production interruption of more than one year; c.
d. When there is a major difference between the factory inspection results and the last type inspection: when the national quality supervision agency proposes to conduct type inspection. e.
Type inspection items
Type inspection items include all items in Article 6.1.1 of this standard and all spot inspection items in Article 6.1.2. 7 Marking
Each shell that passes the inspection shall be stamped with a steel stamp on its shoulder (inflatable valve end), and the contents of the steel stamp shall be arranged as shown in the figure below.
OOOOOO
Year and month of manufacture
Shell number
Nominal pressure, MPa
Nominal volume, L
Bladder type A, AB
Accumulator type
Diaphragm type A, B, C
Shell name
Bladder type: NXQ
Diaphragm type: GXQ
Manufacturer code
Pressure vessel inspection code
Shell material
JB/T7038-1993
Shell design
(Supplementary part)
The material for manufacturing the shell must be killed steel. The steel type should be high-quality carbon structural steel, chrome-molybdenum steel or other alloy steel. The shell material should have a quality certificate, and its chemical composition should not only meet the corresponding material standards, but also meet the requirements of Table A1. Table A1
Carbon structural steel
Alloy steel
Pipe material specifications, dimensions, geometric tolerances, internal and external surface quality and mechanical properties shall comply with the provisions of GB8162. Recommended materials are shown in Table A2.
Nominal pressurebzxZ.net
Shell strength
Bladder shell
20, 35
20CrMo
30CrMo, 35CrMo, 30CrMnSiA
30CrMnTi, 35CrMnSiA
30CrMnSiNiA
The wall thickness of the shell of bladder accumulator is calculated according to formula (A1): body
20]+ p
The shell strength calculation of diaphragm accumulator shall comply with the relevant provisions of GB150. Determination of allowable stress
1 The safety factor is determined according to Table A3.
Calculate the allowable stress according to formula (A2) and formula (A3): A2.3.2
Diaphragm shell
ZG35II,16MnR
ZG35IⅡI,16MnR
ZG35CrMo
(Forging) 35CrMo
JB/T7038-1993
[o 6]= e
A2.3.3 Compare the size of [α] and [. ], and the smaller value is the allowable stress [α]. 4 The wall thickness corrosion allowance shall not be less than 0.5mm. A2.4
Ratio of yield strength to tensile strength (αl) A3.1
When normalizing, normalizing + tempering heat treatment specifications are adopted,. ,/α,≤0.75. When quenching + tempering heat treatment is adopted, 0a≤0.90. (A2)
JB/T70381993
Appendix B
Shell tensile test, impact test, cold bending test and metallographic inspection, specimen sampling position (supplement)
The sampling position of the bladder accumulator shell is shown in Figure B1. Impact test piece
Lifting test piece
Cold bending test piece
Note: ①Tensile and impact test pieces should be taken on the cylinder, 50mm away from the transition between the two shoulders; metallographic test pieces should be taken at the ends of the two spheres. ②Cold bending test pieces are half rings or 1/3~1/4 rings. B2
The diaphragm accumulator shell is sampled from the furnace sample, and the furnace sample must be the same as the shell remelted steel grade and manufacturing conditions. Additional Notes:
This standard was proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. This standard was drafted by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lai Yongzhi, Dai Xintian, Wang Shijie, and Hong Yanhong. People's Republic of China
Mechanical Industry Standard
Hydraulic Isolation Accumulator
Shell Technical Conditions
JB/T70381993
Published by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Sheet 3/4
Format 880×1230
Word Count 16,000
First Edition in May 1994
First Printing in May 1994
Print Quantity 1-500
Price 6.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_8504
The inspection results of all items of unit-by-unit inspection shall comply with the provisions of the technical requirements. 6.1.5
If the inspection of the items of batch sampling fails, the unqualified items shall be re-inspected twice. If it is still unqualified, except for the unqualified items of roundness and straightness, which can be inspected and accepted unit by unit, if other items fail, the batch shall be deemed unqualified. Type inspection
Type inspection shall be carried out in any of the following cases. Finalization identification of new products or old products transferred to the factory for production; a.
b. When there are major changes in structure, materials, and processes that may affect product performance; when resuming production after a production interruption of more than one year; c.
d. When there is a major difference between the factory inspection results and the last type inspection: when the national quality supervision agency proposes to conduct type inspection. e.
Type inspection items
Type inspection items include all items in Article 6.1.1 of this standard and all spot inspection items in Article 6.1.2. 7 Marking
Each shell that passes the inspection shall be stamped with a steel stamp on its shoulder (inflatable valve end), and the contents of the steel stamp shall be arranged as shown in the figure below.
OOOOOO
Year and month of manufacture
Shell number
Nominal pressure, MPa
Nominal volume, L
Bladder type A, AB
Accumulator type
Diaphragm type A, B, C
Shell name
Bladder type: NXQ
Diaphragm type: GXQ
Manufacturer code
Pressure vessel inspection code
Shell material
JB/T7038-1993
Shell design
(Supplementary part)
The material used to manufacture the shell must be killed steel. The steel type should be high-quality carbon structural steel, chrome-molybdenum steel or other alloy steel. The shell material should have a quality certificate, and its chemical composition should not only meet the corresponding material standards, but also meet the requirements of Table A1. Table A1
Carbon structural steel
Alloy steel
Pipe material specifications, dimensions, geometric tolerances, internal and external surface quality and mechanical properties shall comply with the provisions of GB8162. Recommended materials are shown in Table A2.
Nominal pressure
Shell strength
Bladder shell
20, 35
20CrMo
30CrMo, 35CrMo, 30CrMnSiA
30CrMnTi, 35CrMnSiA
30CrMnSiNiA
The wall thickness of the shell of bladder accumulator is calculated according to formula (A1): body
20]+ p
The shell strength calculation of diaphragm accumulator shall comply with the relevant provisions of GB150. Determination of allowable stress
1 The safety factor is determined according to Table A3.
Calculate the allowable stress according to formula (A2) and formula (A3): A2.3.2
Diaphragm shell
ZG35II,16MnR
ZG35IⅡI,16MnR
ZG35CrMo
(Forging) 35CrMo
JB/T7038-1993
[o 6]= e
A2.3.3 Compare the size of [α] and [. ], and the smaller value is the allowable stress [α]. 4 The wall thickness corrosion allowance shall not be less than 0.5mm. A2.4
Ratio of yield strength to tensile strength (αl) A3.1
When normalizing, normalizing + tempering heat treatment specifications are adopted,. ,/α,≤0.75. When quenching + tempering heat treatment is adopted, 0a≤0.90. (A2)
JB/T70381993
Appendix B
Shell tensile test, impact test, cold bending test and metallographic inspection, specimen sampling position (supplement)
The sampling position of the bladder accumulator shell is shown in Figure B1. Impact test piece
Lifting test piece
Cold bending test piece
Note: ①Tensile and impact test pieces should be taken on the cylinder, 50mm away from the transition between the two shoulders; metallographic test pieces should be taken at the ends of the two spheres. ②Cold bending test pieces are half rings or 1/3~1/4 rings. B2
The diaphragm accumulator shell is sampled from the furnace sample, and the furnace sample must be the same as the shell remelted steel grade and manufacturing conditions. Additional Notes:
This standard was proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Institute of Automation of the Machinery Industry of the Ministry of Machinery Industry. This standard was drafted by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lai Yongzhi, Dai Xintian, Wang Shijie, and Hong Yanhong. People's Republic of China
Mechanical Industry Standard
Hydraulic Isolation Accumulator
Shell Technical Conditions
JB/T70381993
Published by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Sheet 3/4
Format 880×1230
Word Count 16,000
First Edition in May 1994
First Printing in May 1994
Print Quantity 1-500
Price 6.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_8501
When normalizing, normalizing + tempering heat treatment specifications are adopted, . , /α, ≤0.75. When quenching + tempering heat treatment specifications are adopted, 0a≤0.90. (A2)
JB/T70381993
Appendix B
Shell tensile test, impact test, cold bending test and metallographic inspection, specimen sampling position (supplementary)
The sampling position of the bladder accumulator shell is shown in Figure B1. Impact test piece
Lifting test piece
Cold bending test piece
Note: ①Tensile and impact test pieces should be taken on the cylinder, 50mm away from the transition between the two shoulders; metallographic test pieces should be taken at the ends of the two spheres. ②Cold bending test pieces are half rings or 1/3~1/4 rings. B2
The shell of the diaphragm accumulator is sampled from the furnace sample, and the furnace sample must be the same as the shell remelted steel grade and manufacturing conditions. Additional remarks:
This standard is proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Mechanical Industry Automation Research Institute of the Ministry of Machinery Industry. This standard is drafted by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lai Yongzhi, Dai Xintian, Wang Shijie, and Hong Yanhong. People's Republic of China
Mechanical Industry Standard
Hydraulic Isolation Accumulator
Shell Technical Conditions
JB/T70381993
Published by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Sheet 3/4
Format 880×1230
Word Count 16,000
First Edition in May 1994
First Printing in May 1994
Print Quantity 1-500
Price 6.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_8501
When normalizing, normalizing + tempering heat treatment specifications are adopted, . , /α, ≤0.75. When quenching + tempering heat treatment specifications are adopted, 0a≤0.90. (A2)
JB/T70381993
Appendix B
Shell tensile test, impact test, cold bending test and metallographic inspection, specimen sampling position (supplementary)
The sampling position of the bladder accumulator shell is shown in Figure B1. Impact test piece
Lifting test piece
Cold bending test piece
Note: ①Tensile and impact test pieces should be taken on the cylinder, 50mm away from the transition between the two shoulders; metallographic test pieces should be taken at the ends of the two spheres. ②Cold bending test pieces are half rings or 1/3~1/4 rings. B2
The shell of the diaphragm accumulator is sampled from the furnace sample, and the furnace sample must be the same as the shell remelted steel grade and manufacturing conditions. Additional remarks:
This standard is proposed by the National Hydraulic and Pneumatic Standardization Technical Committee. This standard is under the jurisdiction of the Beijing Mechanical Industry Automation Research Institute of the Ministry of Machinery Industry. This standard is drafted by the Xi'an Heavy Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Lai Yongzhi, Dai Xintian, Wang Shijie, and Hong Yanhong. People's Republic of China
Mechanical Industry Standard
Hydraulic Isolation Accumulator
Shell Technical Conditions
JB/T70381993
Published by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Sheet 3/4
Format 880×1230
Word Count 16,000
First Edition in May 1994
First Printing in May 1994
Print Quantity 1-500
Price RMB 6.00
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_850
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