SY/T 5038-1992 Spiral seam high frequency welded steel pipe for general fluid transportation pipeline

SY/T 5038-1992 Spiral seam high frequency welded steel pipe for general fluid transportation pipelineSY/T5038-1992 Standard download decompression password: www.bzxz.net

Petroleum and Natural Gas Industry Standard of the People's Republic of China This standard remains valid after the review in 1999. SY/T 5038--92
For ordinary fluid conveying pipelines
Spiral seam high frequency welded steel pipes
1992-04-27 Issued
Ministry of Energy of the People's Republic of China
1992-10-01 Implementation
1 Subject content and scope of application
Petroleum and Natural Gas Industry Standard of the People's Republic of China For ordinary fluid conveying pipelines
Spiral seam high frequency welded steel pipes
SY/T 5038-92
SY 5038-83
Replaces SY6099-83
This standard specifies the quality requirements for spiral seam high frequency welded steel pipes (hereinafter referred to as "steel pipes") for ordinary fluid conveying pipelines. This standard applies to steel pipes for conveying common fluids such as water, gas, air, and heating steam, and also to steel pipes for conveying other fluids with similar requirements.
2 Reference standards
Carbon structural steel
GB223 Chemical analysis methods for steel and alloys
GB6397 Metal tensile test specimens
GB26513
Explosive joint tensile test method
Metal pipe hydraulic test method
3 Symbols and codes
D: nominal outer diameter of steel pipe, mm
f: nominal wall thickness of steel pipe, m
mTheoretical weight of steel pipe per meter, kg/ms
Hydrostatic test pressure, MPabzxZ.net
［a: Test stress of hydrostatic test, MPa. 4
4 Dimensions, shape and placement
4.1 Nominal dimensions
4.1.1 The nominal outer weight of the steel pipe shall comply with the provisions of Table 1. 4.1.2 The nominal wall thickness of the steel pipe shall comply with the provisions of Table 1. 4.2 Length of steel pipe
4.2.1 Normal length, 6 to 12 m. The normal length supplied may be lengthened or shortened according to the requirements of the purchaser and with the agreement of the supply and demand parties. 4.2.2 Fixed length, the fixed length shall be within the normal length range, and its limit deviation is ±500 mmL. 4.2.3 Precision length, with the agreement of the supply and demand parties, the precision length of the steel pipe with a length limit deviation stricter than that specified in Article 4.2.2 may be supplied.
4.3 Limit deviation of size
4.3.1 Outside diameter of steel pipe
4.3.1. The limit deviation of the outer diameter of the steel pipe shall not exceed ±1.5%. Measured by circumference method. 4.3.1.2 The limit deviation of the outer diameter within 100mm length of the steel pipe end is ±1.25%D, but the maximum shall not exceed ±4.0mm. Measured by circumference method.
Approved by the Ministry of Energy of the People's Republic of China on April 27, 1992, and implemented on October 1, 1992
SY/T5038--92
Nominal outer diameter, nominal wall thickness and theoretical weight per meter of steel pipet, mm
m, kg/m
Summary: ① According to the requirements of the purchaser and after the agreement between the supply and demand parties, steel pipes with sizes between the outer diameter and nominal wall thickness listed in the table can be supplied. ② The nominal outer diameter in brackets in this table is the reserved diameter. 4.3.2 Wall thickness of steel pipe
4.3.2.1 The steel pipe should be inspected for thickness. Except for the welding area, the limit deviation of the wall thickness at any place shall not exceed ±12.5%. 4.3.2.2 The wall thickness can be measured by a wall thickness scale or other non-destructive testing devices with corresponding accuracy. In case of dispute over wall thickness or arbitration test, the result measured by wall thickness micrometer shall prevail. 4.4 Roundness
Within the range of 100mm length of the pipe end, the largest diameter of the steel pipe shall not be larger than the nominal outer diameter! .0%D, and the smallest outer diameter shall not be smaller than the nominal outer diameter by 1.0%D. Use calipers, rod gauges or other measuring tools that can measure the maximum and minimum outer diameters. 4.5 Curvature
The curvature of steel shall not exceed 0.25% of the length of the steel stop. A thin rope or thin wire can be pulled from one end of the side surface of the steel pipe to the other end parallel to the axis of the steel pipe, and the maximum distance from the tightened rope or thin wire to the side surface of the steel pipe can be measured. 4.6 Pipe end
4.6.1 The pipe end of the steel pipe with a wall thickness greater than 5mm shall be processed with a groove, the groove angle is 30*:, and the blunt edge size is 0~3mm. The bevel angle is measured with the vertical line of the steel pipe axis as the reference. According to the requirements of the purchaser, it can be delivered in a flat state. With the agreement of the supply and demand parties, other bevel angles can also be used.
4.6.2 The end face of the steel pipe should be perpendicular to the axis of the steel cylinder, and the limit deviation (bevel cutting) shall not exceed 1.5mm. 2
4.7 Steel pipe weight
SY/T5038--92
4.7.1 The theoretical weight of steel pipe per meter is calculated according to formula (1): m=0.02466（Dt）t
Where: m——theoretical weight of steel pipe per meter, kg/m, D—nominal outer diameter of steel pipe, mm,
t-nominal wall thickness of steel pipe, mm.
4.7.2 The steel pipes within the scope of this standard are delivered according to the theoretical weight. With the agreement of the supply and demand parties, they can also be weighed and delivered according to the actual weight measured.
5 Technical requirements
5.1 Production method of steel pipe
5.1.1 The steel pipes within the standard range are made of hot-rolled strips, spirally formed at room temperature, and welded by high-frequency lap welding or butt welding.
5.1.2 Butt welds of steel strips
5.1.2.1 Butt welds of steel strips are allowed on steel pipes, and the distance between the butt welds and the pipe ends shall not be less than 300mm. Butt welds of steel strips are welded by double-sided submerged arc welding or single-sided explosion and double-sided forming welding. 5.1.2.2 It is allowed to mill off the excess height of butt welds of steel strips, but the milling area or the original surface of the weld shall not be lower than the surface of the parent material. 5.1.3 Butt-welded long steel pipes
5.1.3.1 It is allowed to weld two short pipes of the same specification and the same steel grade into one steel pipe. The length of each short pipe shall not be less than 2m.
5.1.3.2 The spiral welds on both sides of the circumferential weld shall be staggered, and the circumferential distance shall not be less than -150mm. 5.1.3.3 Butt-welded circumferential welds can be welded by semi-automatic buried grasping welding or manual welding. 5.2 Steel types
The steel pipes covered by this standard shall be welded with Q195, Q215 and Q235 steels in GB700. Other steel types with good welding performance may also be used by agreement between the supply and demand parties. The technical conditions shall be determined by agreement between the supply and demand parties. 5.3 Chemical composition
The smelting analysis composition of the selected steel shall comply with the provisions of the corresponding steel strip mark or the technical conditions of the agreement. The supplier shall provide the smelting analysis report of the steel used for the steel pipe in the order according to the smelting batch. 5.4 Mechanical properties
The spiral welds and welded joints of the steel pipes within the scope of this standard must be subjected to tensile tests to determine the tensile strength of the welded joints. The tensile strength value shall not be lower than the minimum tensile strength value of the corresponding steel strip standard specification. 5.5 Hydrostatic pressure test
5.5.1 Each steel pipe must be subjected to a factory hydrostatic distance test, and there should be no leakage. The test pressure shall not be lower than the provisions of Article 5.5.2. 5.5.2 The test pressure of the hydrostatic pressure test of the steel pipe shall be calculated according to formula (2) and shall be accurate to 0.1MPa. However, the maximum shall not exceed 15.0MPa. 2fa_t
In the formula: hydrostatic pressure test force, MP
[] - hydrostatic pressure test stress, MPat - nominal wall thickness of steel, mm z
D nominal outer diameter of steel pipe, mm.
Note: The test pressure of the hydrostatic test refers to the test pressure of the steel pipe production process inspection, which does not provide a basis for the design of the steel pipe, and has no direct relationship with the working pressure.
SY/T 5038-92
5.5.3 The test stress of the hydrostatic test is selected according to 60% of the minimum service strength specified in the corresponding steel strip standard. 5.5.4 The test pressure holding time of the hydrostatic test shall not be less than 10s. 5.5.5 Steel pipes with water seepage or water found in the hydrostatic test can be repaired according to the provisions of Article 5.9. 5.6 Acid Etching Inspection
The high-frequency welding area shall be subjected to fracture grinding acid etching inspection to check the macro defects on it. The depth of the defect (measured along the wall thickness) of the high-frequency explosion zone found on the acid-etched sample into the pipe wall surface shall not exceed 0.125, but the maximum shall not exceed 1.0mⅢ. 5.7 Ultrasonic testing
5.7.1 The butt welds, circumferential welds and repair welds on the steel pipe shall be subjected to ultrasonic testing. 5.7.2 The butt welds and repair welds on the steel pipe shall not have incomplete fusion and incomplete penetration; the circumferential welds shall not have incomplete fusion, and the length of incomplete penetration shall not exceed 6t within the weld length.
5,8 Appearance quality
5.8.1 Surface defects of steel pipes
The surface of the steel pipe shall not have cracks, scars, folds and other defects whose depth exceeds the lower deviation of the nominal wall thickness. For defects whose depth cannot be determined, grinding should be used to completely remove them and then measure them. 5.8.2. Delamination and inclusions
Delamination or inclusions with a transverse dimension exceeding 6mm on the steel pipe shall not be allowed to extend to the pipe end face or groove surface. The pipe end with delamination or inclusions exceeding 6mm shall be cut off until there is no delamination or inclusion exceeding 6mm. 5.8.3. Pit
There shall be no pit with a depth exceeding 5mm on the steel pipe. The pit depth refers to the distance between the lowest point of the depression and the extension of the original contour of the steel pipe. The pit length shall not exceed 0.5D in any direction. When there are sharp scratches on the back of the depression, the pit depth shall not exceed 3mm. For pits with sharp scratches, the sharp scratches can be ground off, but the pit depth and length after grinding shall comply with the above provisions. It is allowed to flatten the pit by mechanical methods.
5.8.4. High-frequency welding zone defects
5.8.4.T. There shall be no defects such as broken welds and bulges in the high-frequency welding zone. 5.8.4.2 The side misalignment (radial misalignment) of the high-frequency welding zone shall meet the following requirements: a. When measured from the outer surface of the steel pipe, it shall not exceed 2.5mmb; when measured from the inner surface of the steel pipe, it shall not exceed 2.0mm. 5.8.4.3 The height of the burr (weld bump) of the high-frequency welding shall not exceed 2.5mm for lap welding (measured based on the opposite side of the better product) and 0.5mm for butt welding. When the burr is pressed into the pipe wall, it shall be handled in accordance with Article 5.6. 5.8.4.4 When there are defects in the high-frequency welding zone whose depth cannot be determined, the repair method shall be used to completely eliminate them first, and then measure them. 5.8.4.5 For defects in the high-frequency welding zone, repair welding is allowed after the extension range of the defects is determined. 5.8.5 Defects of butt welds, circumferential welds and repair welds 5.8.5.1 The surface of butt welds, circumferential welds and repair welds shall not have defects such as cracks, broken edges, burn-throughs, and pits. The weld shape shall be uniform and regular, and the transition shall be smooth.
5.8.5.2 The depth of the undercut of the burst seam shall not exceed the lower deviation of the nominal thickness of the steel arm. The undercut with a depth exceeding the lower deviation of the nominal thickness of the steel arm shall be repaired. The undercut with a depth exceeding 0.5m and a length exceeding 0.5 shall be ground. 5.8.5.3 The misalignment of butt welds and circumferential welds shall not exceed 2.5mm; the height shall not exceed 3.0mm. 5.8.6 Treatment of defects
For steel pipes with the above defects, one of the following methods shall be used: a: The defects can be removed with a grinding wheel, but the remaining wall thickness must be within the allowable deviation range b. Repair according to the provisions of Article 5.9
c. The defective pipe section shall be cut off within the allowable length range for 4
d and judged as unqualified.
5.9 Grinding and repairing of defects
SY/T 5038-92
5.9.1 For defects on steel pipes, if the remaining wall thickness after grinding is within the allowable deviation range, grinding should be used to remove the defects as much as possible. Grinding requires skilled and delicate operation, and the grinding area should smoothly transition to the original surface of the steel pipe. 5.9.2 For defects on steel pipes to be repaired by welding, the defects must be cleaned before repairing welding, and the repairing welding area must be thoroughly cleaned to meet the welding requirements.
5,9.3 Repairing welding can be semi-automatic buried arc welding or manual welding. 5.9.4 The minimum length of the repairing weld is 50mm. If the defect direction allows, the repairing weld should be in the circumferential direction. 5.9.5 The repairing weld on the material should be ground, and the height after grinding shall not exceed 1.5mm. 5.9.6 The repaired steel pipe must be subjected to static permanent pressure test according to the provisions of Article 5.5. 6 Test method
6.1 Chemical analysis
6.1.1 The sample for chemical analysis can be taken from the finished steel pipe or steel. When sampling from the steel strip, the sampling method and sampling position shall comply with the provisions of the corresponding steel strip standard. When sampling from the steel pipe, the distance between the sample and the weld shall not be less than one-fourth of the distance between the adjacent spiral welds.
6,1.2 The method for determining chemical composition shall comply with the provisions of GB223. 6.2 Tensile test
6.2.1 The sample for tensile test of welded joints shall be cut perpendicular to the weld, with the weld chain at the sample part. Its shape and size must comply with the provisions of Article 4.3.2 of GB397. It is allowed to slowly press the sample at room temperature. 6.2.2 Except as otherwise specified in this standard, the tensile test method shall comply with the provisions of GB2651. The test temperature is room temperature. 6.3 Hydrostatic test
The method of hydrostatic test shall comply with the provisions of GB241. 6.4 Acid etching test
6.4.1 The sample for corrosion inspection shall be cut and inspected as soon as possible after the spiral weld is completed. 6.4.2 The acid etching sample shall be cut from the starting end by gas cutting, and the acid etching surface shall be ground. The ground surface shall not clearly see the fusion line after acid etching. The sample shall not be hit or deformed before the test, and the high temperature (red) sample shall not be ignited. 6.5 Ultrasonic test
All equipment capable of detecting crack defects can be used. The inspection method shall be determined by the supplier or by agreement between the supplier and the buyer.
7 Inspection rules
7.1 Inspection and acceptance
The quality inspection and acceptance of steel pipes shall be carried out by the supplier's quality inspection department. 7.2 Surface and size inspection
The surface quality of steel pipes shall be inspected one by one, and the size shall be measured one by one. 7.3 Chemical composition of parent material 3.1 The supplier shall conduct a chemical analysis of the parent material steel strip. The number of samples for each batch shall be determined by the supplier. At least one sample shall be taken from each smelting batch of steel pipes or steel strips for testing. 7.3.2 If the test results of the sawn tubes or steel strips representing an inspection batch are unqualified, the supplier shall test the steel pipes or steel strips of other smelting batches in the batch one by one. For the smelting batch that failed the inspection, two samples shall be taken from the uninspected steel pipes or steel strips of the smelting batch for re-inspection. If the test results of the re-inspected samples are all qualified, except for the steel pipes or steel coils that failed the initial inspection, the batch of steel can be judged as qualified and shall be accepted in accordance with SY/T 5038-92. If the test results of one or two samples in the re-test samples are unqualified, the steel pipes or hook strips that have not been inspected in the smelting batch shall be sampled one by one (roll) for testing.
7.4 Tensile test of welded joints
7.4.1 The specimen for the tensile test of welded joints shall be one steel pipe drawn from a batch of no more than 80 steel pipes of the same steel grade and the same nominal size produced by the same production shift, and one specimen shall be taken for testing. 7.4.2 If the tensile test results representing a batch of steel pipes are unqualified, the supplier may draw two more steel pipes from the same batch of steel pipes, and take one specimen from each steel pipe for re-testing. If the test results of the re-test samples are all qualified, the batch of steel pipes can be judged as qualified and shall be accepted manually, except for the steel pipes that failed the initial inspection sampling. If the test results of one or two samples in the re-test samples are unqualified, the supplier may sample one by one of the steel pipes that have not been inspected in the batch for testing.
7.5 Acid Etching Test
7.5.1 During normal production, at least one sample shall be taken for every 10 steel pipes for acid etching test. If the acid etching test result of a batch of steel pipes fails, samples shall be taken from the steel pipe that failed the test and retested one by one until it passes. 7.5.2 At the beginning of each shift and when the process parameters are adjusted, one sample shall be taken from each of the three steel pipes for inspection. If the test result of the third steel pipe fails, the subsequent steel pipes shall be sampled and inspected one by one until they pass. 8 Coating, Marking and Quality Certificate
8.1 Coating
The outer surface of the steel pipe shall be sprayed with a coating that meets the anti-rust requirements during storage and transportation. The coating shall be smooth and even, and shall not be too thick or leaking. Coating is not required according to the agreement of both parties and stated in the contract. 8.2. Marking
8.2.1 Marking position
On the outer surface of each steel pipe, the marking shall be sprayed according to the provisions of Article 8.2.2 at a distance of about 500mm but not less than 100mm from the arm end. In addition, for steel pipes with a nominal outer weight greater than 273mm, the marking shall be sprayed or marked with a patch at a distance of not less than 100mm from the inner surface of the pipe end according to the provisions of Article 8.2.3. The internal and external markings must be made on one end of the steel pipe. 8.2.2 External markings
No. of this standard,
Nominal outer diameter of steel pipe, mm
Nominal wall diameter of steel, mms
Steel length, mm
Steel grade:
Batch number of steel strip;
Factory hydrostatic test pressure, MPa;
Pipe number (the first two digits are the year of production, followed by a "well" plus a sequence number) Supplier code or trademark
" Qualified mark of the quality inspection department.
And other contents that the supplier deems necessary to indicate. External marking example: spiral seam high frequency welded pipe for ordinary fluid delivery pipeline, nominal outer diameter 323.9mm, nominal wall thickness 6mm, length 11500mm, steel grade Q295, steel strip batch number A5024, hydrostatic test pressure p=5,2MPa, brand number 90#7654, factory code AB, inspection mark (inspection).
SY503892
8,2.3 Internal mark
323.9×6×11500
90#7654
(Inspection)
a. Tube number,
b. Steel number
c. Supplier code or trademark.
SY/T 5038-92
and other contents that the supplier deems necessary to indicate. Internal marking example: Steel pipe is the same as Article 8.2.2. 90#7654
Q235AB
8.2.4 When the purchaser raises a quality objection, the tube number should be provided as much as possible. 8.3 Quality certificate
The quality inspection department of the supplier shall provide a quality certificate for the steel pipes shipped out of the factory to prove that the supplied steel pipes meet the requirements of this standard. The quality certificate shall indicate:
Supplier name:
Buyer name,
Trade name:
Standard number,
Product name and size:
Number of pieces and weight;
Batch number and steel grade of steel strip,
Various test results specified in the standard and contract Shipping number:
Shipping time:
Stamp of quality inspection department.
And other contents that the supplier considers necessary to indicate. Additional remarks:
This standard is proposed by China National Petroleum and Natural Gas Corporation. This standard is under the responsibility of the Petroleum Temporary Materials Professional Standardization Committee of China National Petroleum and Natural Gas Corporation. This standard is drafted by Baoji Petroleum Steel Pipe Factory.
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