HG/T 2601-2000 Technical requirements for centrifugal casting alloy furnace tubes for high temperature pressure
Some standard content:
ICS 71.120;25.180
Registration No. 7412-2000
Chemical Industry Standard of the People's Republic of China
HG/T2601—2000
Centifugal casting alloy tubes for serviceof pressure bearing at high temperature2000-06-30 release
National Stone
20010501 implementation
HG/T2601-2000
1 Scope
2 Reference standards
3 Requirements
4 Test methods and inspection rules
5 Marking, packaging, transportation, storage
Appendix A (standard appendix), product chemical composition allowable deviation...Appendix B (suggestive appendix) Comparison of some material brands with foreign brands
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HG/T2601-2000
Since the release of HG/T2601-1994 "Technical Conditions for Centrifugal Casting Alloy Furnace Tubes for High Temperature and Pressure", great breakthroughs have been made in the manufacture of centrifugal casting alloy furnace tubes, and new progress has been made in materials, varieties, quality and testing technology. In recent years, our contacts with foreign manufacturers and users have become increasingly deepened and close, so we have studied foreign similar standards more deeply. Combining the reference points of foreign similar standards with user requirements to form scientific industry standards with practical value for design, manufacturing and use is the guiding ideology of revising HG/T2601-1994. This standard refers to the relevant standards and technical requirements of some enterprises in my country and abroad, and summarizes the experience of long-term production practice. It has made major changes and additions to HG/T2601-1994, making the standard more rigorous and enhancing operability. This standard stipulates 34 material grades, and the factory can also provide grades not listed in the table upon user request. This standard will replace HG/T2601-1994 from the date of implementation. Appendix A of this standard is the standard appendix, and Appendix B is the reminder appendix. This standard is proposed by the Policy and Regulations Department of the State Administration of Petroleum and Chemical Industry. This standard is under the jurisdiction of the Chemical Industry Chemical Machinery and Equipment Standardization Technical Committee. The drafting units of this standard: Sichuan Chemical Machinery Factory and Chemical Industry Ministry Chemical Machinery Research Institute. The main drafters of this standard are Wang Yegong, Chen Zhiping, Yang Jiansheng, Bu Ruihu, Chen Xianrong, Huang Li and Chen Bin. This standard was first issued in December 1984 and revised for the first time in April 1994. Ⅱ
1 Scope
Chemical Industry Standard of the People's Republic of China
Centifugal casting alloy tubes for serviceof pressure bearing at high temperature-rrKAONiKAca-
HG/T2601—2000
Replaces HG/T2601—1994
This standard specifies the requirements for the manufacture, testing, inspection, marking, packaging, transportation and storage of centrifugal casting alloy tubes for serviceof pressure bearing at high temperature (hereinafter referred to as furnace tubes).
This standard applies to furnace tubes of petrochemical hydrogen reformers and ethylene cracking furnaces, and also to other furnace tubes for high temperature pressure. This standard can also be used for high temperature resistant parts such as furnace bottom rollers and glass pressure rollers. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T223—1991
GB/T226—1991
GB/T 228 1987
GB/T 3323 —1987
GB/T4338—1995
GB/T6395
CB/T9443—1988
JB47082000
3 Requirements
3.1 Manufacturing
Chemical analysis methods for steel and alloys
Macrostructure and defect acid etching test method for steel Metal tensile test method
Radiography and quality classification of steel fusion welded butt joints High-temperature tensile test for metallic materials
High-temperature tensile endurance test method for metals
Method for rating of flaw detection and defect indication of steel castings Welding procedure assessment for steel pressure vessels
3.1.1 The furnace tube shall be melted in an electric arc furnace or induction furnace, centrifugally cast into tube sections using a metal mold, and then welded into long tubes as required. 3.1.2 Furnace tubes can be delivered in sections or welded long tubes according to the requirements of the buyer's drawings. 3.1.3 Tube sections, welded long tubes and welds do not require heat treatment. 3.1.4 During the manufacturing process of furnace tubes, the manufacturer must carry out marking and transplanting. The ink used for marking and transplanting must not contain Sn, Pb, Zn, S, CI and other harmful elements to furnace tubes.
3.1.5 Each batch must be inspected. If two or more batches of molten steel are poured into the same ladle for pouring, they can be regarded as one batch. 3.2 Delivery status
According to user requirements, furnace tubes can have the following three delivery statuses: a) The inner and outer walls of the furnace tube are machined; b) The inner and outer walls of the furnace tube are cast;
c) The outer wall of the furnace tube is cast and the inner wall is machined. 3.3 The outer wall of the furnace tube is in the cast state (except for the mechanical processing of the weld area). Sandblasting (or shot peening) treatment should be carried out when it is delivered. 3.4 If the purchaser requires the use of special smelting methods, or has other requirements for the delivery status, it should be noted in the order contract. 3.5 Chemical composition and mechanical properties
Approved by the State Administration of Petroleum and Chemical Industry on June 30, 2000, implemented on May 1, 2001
HG/T 2601—2000
3.5.1 The steel grade and chemical composition of the furnace tube shall comply with the provisions of Table 1. If the user has other requirements for the chemical composition, it shall be manufactured according to the user's drawings and technical conditions. For the convenience of checking, Appendix B (Reminder Appendix) lists the comparison of some material grades with equivalent foreign grades. 3.5.2 Mechanical properties
3.5.2.1 The room temperature mechanical properties of the furnace tube shall comply with the provisions of Table 2. 3,5.2.2 High temperature short-time mechanical properties of furnace tubes According to the requirements of the demander, a certain condition is selected for high temperature short-time tensile test, and its index should meet the performance requirements agreed by the buyer and the seller; if the temperature is not specified, the test should be carried out at 871C (or 800℃), and heat treatment is not allowed to improve the hot tensile properties of the sample, but the sample can be allowed to be aged for 24 hours at the test temperature before the test. The values specified in Table 3 can be used as a reference.
3,5.2.3 High temperature endurance test of furnace tubes can be carried out under a certain condition according to the requirements of the demander. If the demander has no specific requirements, the test is carried out under 9MP: at 871℃, and the results should meet the requirements of Table 4. The endurance test requirements of the steel grades not listed in Table 4 shall be determined by negotiation between the buyer and the manufacturer in the order contract.
3.6 Metallographic macrostructure
The metallographic macrostructure of the furnace tube section meets the following requirements for the finished product: a) The thickness of the rough layer on the as-cast outer surface is not more than 0.8mm; b) The thickness of the dense layer meets the requirements of the drawing;
e) The crystal layers of the cold and hot ends are evenly hooked. If the user has special requirements for the ratio of equiaxed crystals to columnar crystals, the supply and demand parties shall negotiate and determine in the order contract.
3.7 Manufacturing tolerance
3.7.1 Inner and outer diameter tolerance
3.7.1.1 The tolerance of the furnace tube with both inner and outer surfaces machined: +1.0
a) Outer diameter limit deviation: 0mm;
b) Inner diameter limit deviation: -1.Omm.
3.7.1.2 The tolerance of furnace tubes with cast outer surface and machined inner surface:) The outer diameter limit deviation shall not be greater than the value specified in Table 5; 0
b) The inner diameter limit deviation: -1.Omma
3.7.1.3 The minimum wall thickness of furnace tubes delivered in cast state without machined inner and outer surfaces shall not be less than the wall thickness of the dense layer plus the inner diameter margin and the thickness of the outer surface rough layer to ensure the minimum wall thickness of the dense layer, and the wall thickness deviation shall not be greater than the value specified in Table 6. 3.7.2 Length tolerance
3.7.2.1 When the total length is less than 6m, the length limit deviation is 0mm+6.4
3.7.2.2 When the total length is greater than or equal to 6m and less than 10m, the length limit deviation is 0mm. +10.0
3.7.2.3 When the total length is greater than or equal to 10m, the length limit deviation is 0mm3.7.3 Straightness tolerance
Pipe section or long pipe after assembly welding, 2mm within any 1m, full length straightness is 10mm. 3.7.4 Wall thickness deviation
The deviation of the wall thickness of the inner surface machined furnace tube at any position is not more than 1.2mm for conversion tubes and not more than 1.0mm for cracking tubes. 3.7.5 Weld size tolerance
3.7.5.1 The weld surface should smoothly transition to the parent material surface and not be lower than the parent material surface. The weld excess height should not be more than 1.6mm. 3.7.5.2 The coverage width of the weld outside the edge of the weld joint groove is not more than 2mm on each side. ourselves |S'8~0'L
OLE-0'EE
SOs~s'Lb
005~0L
0'1~08
01~0't
0'S-0'E || tt | °0
50~000
0s'0~00
00~000
090~000
SE0-Z0
OF0~0F'0
s'0~st0
802222402
ZG30Cr28Ni4
ZG50C128Ni6
ZG35C24Ni7SiN
ZG35Cr28Ni10
ZG30Cr26Ni12
ZG33C125Ni14
ZG35 Cr28Ni16
ZG30Cr25Ni20
ZG40Cr25Ni20
ZC40C/25Ni20Si2
ZG45Cr24Ni 24NbTi
ZG30C.30N20
ZC40C130Ni20
ZG40Ni25C121
ZG14Ni32Cr20Nb
ZG40Ni35C125
5C125NbW
ZG50Ni35C17
ZG50Ni39Cr19
ZG45Ni48Cr28W5Si2
ZG40Ni48Cr30 W15Si2
ZG50Ni36Cr26Co15 W5
ZG42Ni33C25Nb
ZG45Ni35C127NbW
ZG50Ni48Cr18WS
ZC45Ni48 Ct28 W5Co5|| tt || ZG35Ni24Cr1 8Si2 ||tt || 2601—2000
Table 2 Mechanical properties at room temperature
Cancer strength as
≥MPa
Tensile strength
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(360S6)E8
（0080
ZG35CI24N17SiN
ZG33Cr25Ni14
ZG30C25Ni2 0
ZG40Cr25Ni20
ZG40C25Ni20Si2
ZG14Ni32C20Nb
ZG40Ni35C/25Nb
ZG40Ni35C/25WNb
ZG50Ni36Cr26Co15W5
ZG45 Ni35Cr25NhM
HG/T 2601---2000
Table 4 High overflow endurance mechanical properties
Minimum rupture time (h)
Furnace tube outer diameter
50 - 100
>100 ~ 300
>300 ~ 600
Furnace tube outer diameter
50-150
> 150 ~ 300
>300~ 600
900℃
Table 5 Limit deviation of outer diameter
Table 6 Upper deviation of wall thickness
982℃
Allowable positive deviation of outer diameter
Maximum allowable upper deviation of cast wall thickness
HG/T2601—2000
3.8.1 Number of welding joints allowed for each long pipe (except welds between furnace pipe and flanges at both ends): -rKAONiKAca-
a) For reformer tubes, when the total length is less than or equal to 10m, the number shall not exceed 3; when the total length is greater than 10m, the number shall not exceed 4; b) For ethylene cracking furnace tubes or furnace tubes with an outer diameter of less than 100mm and a wall thickness of less than 10mm, when the total length is less than or equal to 10m, the number shall not exceed 4; when the total length is greater than 10m, the number shall not exceed 5. For furnace tubes exceeding this range, the number of welding joints shall be determined by negotiation between the supply and demand parties. 3.8.2 The welding position of the pipe section with a length of less than 2m shall be placed at the end of the long pipe, and the minimum length of the pipe shall not be less than 1.2m. 3.8.3 The welding groove must be formed by mechanical processing, and its surface roughness shall not be less than 12.5μm. 3.8.4 The welding process assessment before welding the furnace tube shall refer to JB4708 and be carried out in accordance with the following requirements: a) The butt joint shall be subjected to room temperature tensile, high temperature short time, and high temperature endurance tests according to the requirements of the furnace tube parent material; b) The number of specimens for each test is 2 pieces; c) Cast steel materials are exempted from bending and impact tests. 3.8.5 The welding work of the furnace tube shall be performed by welders who have obtained the "Boiler Pressure Vessel Welder Examination Certificate" and are within the validity period. 3.8.6 The misalignment of the pipe head butt ring weld caused by the concentricity error of the two pipe ends during assembly shall not exceed 0.25mm. 3.8.7 During welding, lining rings and other gaskets shall not be used. Incomplete penetration, incomplete fusion and undercut are not allowed. The welding materials shall ensure that the C, Cr, Ni, Co, W, Nb and other element contents and mechanical properties of the deposited metal meet the requirements of the parent material. 3.8.8 When the temperature of the weldment is lower than 0℃, it shall be preheated to about 15℃ within 100mm of the starting welding point. 3.9 Water pressure test
3.9.1 The pipe sections of the furnace tubes shall be subjected to water pressure test one by one. The test pressure shall be stabilized for no less than 10min according to the drawing or contract requirements. The water pressure test of the welded long pipe shall be carried out after the non-destructive testing is qualified, and the water shall be blown dry after the pressure test. The group welding with other pipe fittings can be carried out only after the water pressure test is qualified.
3.9.2 The water used for pressure test shall be clean, the chloride ion content of the water shall not exceed 25mmg/L, and the water temperature shall not be lower than 5℃. 3.10 Nondestructive testing
3.10.1 The base material and repair metal of the welded joint groove, the surface of the base and cover welds, and the defective repair weld area shall be subjected to 100% penetrant testing in accordance with GB/T9443.
3.10.2 Butt welds and repair weld metals with a depth of more than 3mm shall be subjected to 100% radiographic testing. 3.10.3 The inner and outer surfaces within 25mm after the pipe end is processed shall be subjected to liquid penetration testing. If pores, slag inclusions or other defects are found, the defective end shall be cut off and the 25mm pipe end after cutting shall be tested again. If the inspection results meet the requirements, it shall be accepted; otherwise, the same inspection process shall be repeated until it is qualified.
3.10.4 Eddy current testing
If the user has other requirements, the inner surface processed pipe sections shall be subjected to 100% eddy current testing one by one. And acceptance shall be based on the following conditions: a) Any pipe with a defect greater than 0.The pipe section with a depth of 25mm is considered unqualified. If possible, it can be reprocessed to remove the defect or remove the defective section, otherwise it will be scrapped;
b) When the defect depth is between 0.125mm and 0.25mm, use liquid penetrant testing or endoscope inspection to confirm that the defect must be eliminated;
c) When the defect depth is less than 0.125mm, the pipe section is considered qualified. 3.11 Appearance quality
3.11.1 For furnace tubes that are not processed on the outer circle, the bayberry particles on the outer surface should be evenly distributed. 3.11.2 The surface of the furnace tube shall not have defects such as pores, shrinkage cavities, sand holes, cracks and other harmful defects. The surface of the furnace tube weld shall not have cracks, mechanical damage, undercuts, and unfused.
3.11.3 The outer surface of the furnace tube delivered in the cast state must be cleaned after casting to the extent that the metal surface is exposed for visual inspection. 3.12 Defect repair
3.12.1 Repair welding is not allowed for casting defects in reformer and cracking furnace tubes. When the furnace tube defects in 3.11.2 of this standard appear outside the minimum limit size boundary required by the drawing, grinding and removal are allowed, and the surface of the furnace tube after grinding should smoothly transition to the adjacent surface. 3.12.2 For furnace tubes for other purposes, when all or part of the casting defects in 3.11.2 appear within the minimum solid state boundary of the furnace tube, repair welding is allowed only if the following conditions are met at the same time: a) The radial depth of entering the boundary is not greater than 20% of the minimum allowable wall thickness of the furnace tube; b) Within a length of 3m, the area of a single defect (on the cylindrical surface of the outer wall of the furnace tube) is not greater than 625mm; 7
HG/T 2601-—2000
c) Within a length of 3m, the total area of each defect is not greater than 6400mm; l) Welding defects are allowed to be repaired, and the repair of the same part should not exceed 2 times. 3.12.3 Repair welding is not allowed for leakage and sweating defects found in the water pressure test. 4 Test methods and inspection rules
4.1 Chemical composition analysis and allowable deviation of product chemical composition 4.1.1 Chemical composition analysis can be carried out by spectral analysis or chemical analysis. When each furnace of steel is taken out of the furnace, samples are taken from the ladle to cast chemical composition analysis test blocks. Chemical analysis samples must be drilled below 6mm from the surface of the test block and chemical composition analysis is carried out according to GB/T223. The analysis results of the two analysis methods shall meet the requirements of 3.5.1. 4.1.2 The allowable deviation of product chemical composition shall meet the provisions of Appendix A (Appendix to the standard). 4.2 Mechanical properties test
4.2.1 Mechanical properties test at room temperature
4.2.1.1 When the order quantity of the same specification is less than 10 pipe sections, one test is performed for each furnace. 4.2.1,2 When the order quantity of the same specification is greater than or equal to 10 pipe sections, the first 10 pipe sections shall be tested according to 4.2.1.1, and the pipe sections after the 10th pipe section shall be tested every 10 heats.
4.2.1.3 For the test, a tensile specimen shall be cut longitudinally from any pipe section of the heat number represented. 4.2.1.4 When sampling, attention shall be paid to the sampling position to avoid sampling the non-dense layer on the inner or outer surface, and attention shall be paid to the sampling position of the dense layer.
4.2.1.5 Prepare the specimen and test according to GB/T 228, and the results shall meet the requirements of 3.5.2.1. 4.2.2 High-temperature short-time mechanical properties test
4.2.2.1 For the order quantity of the same specification, a high-temperature short-time mechanical properties test shall be conducted every 20 heats. 4.2.2.2 When the order quantity of the same specification is less than 20 heats, the number of tests shall be 1~2 times. 4.2.2.3 The sample shall be cut from the tube at room temperature. The number of samples and the sampling position shall be the same as 4.2.1.3 and 4.2.1.4. 4.2.2.4 The test shall be carried out at the temperature specified in Table 3 according to GB/T4338 for a short-term high-temperature performance test; if the order contains no test temperature in the contract and the drawing, the test shall be carried out at 871℃ (or 800℃) in Table 3, and the result shall comply with the provisions of 3.5.2.2. 4.2.3 High-temperature endurance performance test
4.2.3.1 The reformer tubes and cracking furnace tubes of the same specification shall be tested once every 50 furnaces. 4.2.3.2 When the order quantity of the same specification is more than 150 furnaces, the maximum number of tests shall be 4 times. 4.2.3.3 For non-chemical pressure furnace tubes, endurance test may not be carried out if the contract and the drawing do not specify. 4.2.3.4 The specimens shall be cut from the pipe at room temperature. The number of samples and the sampling positions shall be the same as those in 4.2.1.3 and 4.2.1.4. 4.2.3.5 The test shall be carried out in accordance with GB6395. The test conditions shall be only one temperature and stress specified in Table 4. If the drawing does not specify, the test shall be carried out according to the lowest temperature and stress of the corresponding material in Table 4. The results shall meet the requirements of 3.5.2.3. 4.3 Metallographic low-power acid etching test
4.3.1 Test quantity
4.3.1.1 When the order quantity of the same specification is not more than 10 pipe sections, take a sample at each end of each pipe section. 4.3.1.2 When the order quantity of the same specification is more than 10 pipe sections, take a sample at each end of each pipe section in the first 10 sections produced. Then select one of every 20 sections and take a sample at each end of it. 4.3.1.3 If any test finds that the pipe section is unqualified, all pipe sections of the same furnace must be checked one by one, and the pipe sections of other furnaces in the batch (20 pieces) must be sampled and checked separately. If there are still unqualified pipe sections, all the pipe sections (20 pieces) in the batch shall be sampled and checked. 4.3.2 Metallographic low-magnification acid etching test, prepare samples and tests according to GB/T226, take metallographic photos, and submit test reports. The metallographic structure of the furnace tube shall meet the requirements of 3.6.
4.4 Re-inspection
If any test result of the furnace tube does not meet the requirements, double samples shall be taken from the same furnace (batch) pipe section for re-inspection of the item. The number of re-inspections shall not exceed 2 times. If the re-inspection results still do not meet the requirements, the furnace tube of the furnace (batch) shall be judged to be unqualified. 4.5 Size and shape tolerance inspection
The size and shape tolerance of the furnace tube and its welds shall be inspected one by one, and the results shall meet the requirements of 3.7. 8
4.6 Appearance inspection
HG/T2601—2000
4.6.1 Visual inspection of each furnace tube surface shall be conducted with naked eyes, and the result shall meet the requirements of 3.11. -rKAONiKAca-
4.6.2 Use plug gauge or ball to inspect the root excess height of the butt weld of the assembled furnace tube. The plug gauge diameter or ball diameter is the inner diameter of the tube minus 3.2mm. wwW.bzxz.Net
4.7 Defect repair
The repair welding area shall be carried out in accordance with 3.12, and the welder who has passed the examination shall weld according to the qualified welding procedure regulations. 4.8 Nondestructive testing
4.8.1 Penetrant flaw detection shall be carried out in accordance with the 01 level in GB/T9443. If the user has higher requirements than 01 level, it shall be stated in the contract.
4.8.2 X-ray flaw detection shall be accepted according to the requirements of level I and II in GB/T3323, and the film quality shall be accepted according to level AB. 4.9 Water pressure test
Each furnace tube shall be subjected to water pressure test according to 3.9, and leakage and sweating are not allowed. 5 Marking, packaging, transportation and storage
5.1 Marking
5.1.1 The furnace tubes that are loaded and shipped after passing the inspection must be marked with the qualified mark one by one. 5.1.2 Each group of packaged furnace tubes shall be nailed or tied with two identical labels in the middle and both ends of the packaging rack. The following information should be indicated on the label:
a) Contract number;
b) Material;
c) Number of furnace tubes;
d) Length, width and height after packaging;
e) Net weight and gross weight;
f) Manufacturer's name;
g) Date of manufacture.
5.2 Packaging
5.2.1 Before packaging, the furnace tubes should be cleaned to remove dirt and foreign matter on the inner and outer surfaces. 5.2.2 Before packaging, the processed grooves of the furnace tubes should be well protected. The ends of the tubes should be sealed with special caps or non-contained plastic caps. 5.2.3 The tube sections and welded long tubes shall be packed and clamped in rows of channel steel or angle steel, "V\" wooden pallets and bolts. The clamping shall be firm and reliable, so that each group of tubes can be a rigid whole. Each packaging rack shall be equipped with lifting components such as lifting ears. Non-stainless steel metal or alloy shall not come into contact with the tubes.
5.3 Transportation
5.3.1 When transporting by sea or by land along the coast, effective protective measures shall be taken to prevent seawater erosion. 5.3.2 Each batch of tubes shall have a certificate signed by the quality inspection department. The quality certificate shall include the following contents: a) furnace number of each pipe section; b) physical and chemical test data; c) non-destructive testing results; d) water pressure test results; e) size and shape tolerance inspection results; f) welding repair and weld repair records; g) partial metallographic low-magnification organization photos. 5.4. Storage Furnace pipes shall not be stored in the open air and shall not be exposed to water and corrosive media.Storage
The furnace tubes shall not be stored in the open air and shall not come into contact with water and corrosive media.
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