HG/T 2385-1992 Grey cast iron cooling tube for soda ash cast iron tower HG/T2385-1992 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG/T2385-92
Gray cast iron cooling pipes for soda ash cast iron towers
Published on September 15, 1992
Ministry of Chemical Industry of the People's Republic of China
Implementation on July 1, 1993
Chemical Industry Standard of the People's Republic of China
Gray cast iron cooling pipes for soda ash cast iron towers
Subject content and scope of application
HG/T2385-92
This standard specifies the types and basic parameters, manufacturing, inspection, packaging, storage and transportation requirements of gray cast iron cooling pipes. This standard applies to gray cast iron cooling pipes for soda ash cast iron towers (hereinafter referred to as cooling pipes) produced by sand centrifugal casting and continuous casting.
2 Reference standards
Methods for chemical analysis of steel and alloyswww.bzxz.net
GB977'Methods for mechanical properties of grey cast iron GB3421
Sand mold centrifugal cast iron pipe
Continuous cast iron pipe
GB3422
GB9439Grey cast iron parts
Main types and basic parameters of cooling pipes
The main types of cooling pipe ends are A and B, as shown in Figure 1. Type A (both ends)
3.2 The main dimensions meet the requirements of Table 1.
1992-09-15 approved by the Ministry of Chemical Industry of the People's Republic of China Figure 1
Type B (both ends)
1993-07-01 implementation
3.3 Marking Example
HG/T2385-92
End outer diameter D,
Gray cast iron cooling pipe with centrifugal casting, A-type structure at both ends, nominal diameter DN=50mm, length L=2986mm, its marking is from A50×2986 HG×××
The gray cast iron cooling pipe with continuous casting, A-type structure at both ends, nominal diameter DN=38mm, and length L=2055mm is marked with A38×2055.HG××××
4 Technical requirements
4.1 Materials
4.1.1 Cooling pipes for sand mold centrifugal casting
The gray cast iron of sand mold centrifugal casting cooling pipes shall comply with the provisions of HT200 in GB9439. If there are special requirements, they shall be agreed upon by both parties.
4.1.2 Cooling pipes for continuous casting
The carbon equivalent of the gray cast iron of the continuous casting cooling pipe shall not be less than 4.1%; the sulfur content shall not be greater than one-quarter of the manganese content. If the one-quarter manganese content is less than 0.12%, the sulfur content shall not be greater than 0.12%; the phosphorus content shall not be greater than 0.4%. 4.2 Surface quality
4.2.1 Before machining, the inner and outer surfaces of the cooling pipe must be cleaned and free of burrs. 4.2.2 There should be no cracks on the surface of the cooling pipe. The maximum allowable defect is no more than (2+0.05S) mm in depth and no more than 4 mm in diameter.
The distance between adjacent defects is no more than the maximum allowable defect size, and when the number exceeds 3, it should be considered as a dense defect. Dense defects should be reported as single pinch and air holes on the machined surface of the cooling pipe. Those with a size of no more than 1 mm will not be counted, and the total number of each end machined surface with a size greater than 1 mm shall not exceed 6.
The cold shut depth is no more than 0.5 mm and shall not exceed 5 points per meter of length greater than 0.5 mm and less than 1.5 mm. 4.3 Dimensions and geometric tolerances
4.3.1 The limit deviation of the cooling pipe size shall comply with the provisions of Table 2. Item
Limit deviation
+(1+0.05S)
HG/T2385--92
4.3.2 The straightness deviation of the outer circle generatrix of the cooling pipe shall not exceed 2.4mm/m. 4.4 Mechanical properties
The bending strength of the pipe ring shall be greater than 400MPa, L
4.5 Water jade test
The cooling pipe shall be subjected to a water pressure test with a pressure of 2MPa, and the pressure holding time shall be 30s, and there shall be no leakage: the pipe with leakage during the pressure test shall not be repaired and shall be scrapped.
5 Test methods
5.1 Chemical composition analysis of cooling pipes
According to the provisions of GB223,
5.2 Tensile test
According to the provisions of GB977
5.3 The surface quality of cooling pipes
Inspect by visual method,
5.4 The size of cooling pipes
Measured by conventional measuring tools with corresponding accuracy. 5.5 The straightness deviation of the outer circle generatrix of the cooling pipe is measured with a ruler or a flat plate.
5.6 Water pressure test of cooling pipes
Use a 1.5-level pressure gauge and test each pipe. 5.7 Pipe ring bending strength test
Sampling should be carried out on cooling pipes with qualified surface quality. Sand mold centrifugal casting cooling pipe rings are in accordance with the provisions of GB3421, and continuous casting cooling pipe rings are in accordance with the provisions of GB3422. The bottom hardwood pad can be a cube with six flat sides. 6 Inspection rules
6.1 The cooling pipes shall be inspected and accepted by the quality inspection department of the manufacturer. 6.2 The cooling pipes shall be inspected and accepted in batches. Each batch shall consist of cooling pipes with the same nominal diameter, the same wall thickness, the same length, and the same chemical analysis results, or as agreed by the supplier and the buyer. 6.3 Sampling quantity
6.3.1 The size and shape and position tolerance, surface quality and water pressure test of the cooling pipes shall be carried out one by one. 6.3.2 Chemical composition analysis Two samples shall be taken per shift (within 8 hours). Chemical analysis must be carried out when the charge is changed. 6.3.3 Take at least one sample from each batch for mechanical property test. 6.4 The factory inspection items, inspection rate, inspection method and acceptance requirements of cooling pipes shall comply with the provisions of Table 3.
Inspection items
Surface quality
Dimensions and geometric tolerances
Hydraulic pressure test
Bending strength test of pipe ring
6.5 Re-inspection and judgment rules
HG/T2385-92
Inspection rate%
Inspection Test method
5.4;5.5
Acceptance requirements
6.5.1 If the chemical composition does not meet the requirements of this standard, double sampling can be taken from the cooling pipe body represented by the sample for re-testing. If the re-test result is still unqualified, the cooling pipe batch will be scrapped. 6.5.2 If the mechanical properties test results do not meet the requirements of this standard, the pipe will be scrapped. Double samples should be taken from the same batch of cooling pipes for re-testing of this item. If the re-test result is still unqualified, the cooling pipe batch will be scrapped. 7 Marking, packaging and purchase and transportation
7.1 There is no marking on the cooling pipe body after leaving the factory. 7.2 The machined surfaces at both ends of each pipe should be coated with anti-rust oil and covered with protective covers. The outer surface of the pipe is not coated when leaving the factory. 7.3 The cooling pipe is packaged in a frame or as required by agreement. 7.4 The gross weight of each package body shall not exceed 4t or be packaged as agreed. The external dimensions of the package body shall comply with the current transportation regulations. 7.5 Each package should be equipped with a lifting position, and pipes or studs should not be directly lifted. 7.6 Two labels should be attached to the obvious position of each package, and the following contents should be indicated on the labels: product name, nominal diameter and outer diameter;
number of roots, gross weight and overall dimensions;
manufacturing unit and name of the dispatching station;
receiving unit and name of the destination station;
This standard number:
1. Manufacturing date and production batch number
7.7 The following documents should be provided when the cooling pipe leaves the factory:
Product certificate;
Product quality certificate.
7.8 The product quality certificate should include the following contents: a.
Bending strength test report of the pipe ring;
b. Water pressure test report;
Relevant items specified in the contract.
7.9 The place where cooling pipes are stored should be flat and stacked. Each layer of pipes should be crossed vertically, and the layers should be padded under the non-pipe ends. The height of the pipe stack shall not exceed 3m, and pillars shall be set beside the stack to prevent the pipes from rolling. Additional remarks:
This standard is proposed by China Chemical Equipment Corporation. IG/T2385-92
This standard is under the jurisdiction of the chemical machinery and equipment standardization technical unit of the Ministry of Chemical Industry. This standard was drafted by Sichuan Chemical Machinery Factory and participated in by Dalian Chemical Industry Company Machinery Factory. The drafters of this standard are Fu Xueru, Li Mingrong, Wu Jun and Feng Xiyuan. This standard refers to the straight pipe part of ISO13 "Gray Cast Iron Pipe Fittings", ISO2531 "Nodular Cast Iron Pipes, Pipe Fittings and Accessories for Pressure Pipelines", FOCT9583 "Pressure Conveying Pig Iron Pipes Produced by Centrifugal and Continuous Casting", ASN0427 "Technical Conditions for Flake Graphite Cast Iron Towers for Soda Ash Equipment" and other standards.
People's Republic of China
Chemical Industry Standard
Gray cast iron cooling pipe for cast iron tower of soda ash
HG/T2385-92
Editor: Editorial Department of Chemical Industry Standard
(Institute of Standardization, Ministry of Chemical Industry)
Postal Code: 100013
Institute of Standardization, Ministry of Chemical Industry
Copyright reserved. No reproduction allowed
Format: 880×12301/16 Number of words on a sheet: 9000 First edition in June 1993
First printing in June 1993
Number of print runs: 1-300
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