Some standard content:
National Standard of the People's Republic of China
Titanium and titanium alloy tubes
Titanium and titanium alloy tubes1 Subject content and scope of application
GB/T 3624--- 1995
GB 3624:83
Replacement 4367-84
This standard specifies the classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of titanium and titanium alloy tubes. This standard applies to titanium and titanium alloy seamless tubes produced by cold rolling (cold drawing) method and titanium and titanium alloy welded tubes produced by welding method and welding rolling method.
This standard applies to: titanium and titanium alloy tubes for general industrial purposes. This standard does not apply to titanium and titanium alloy tubes used in heat exchangers, condensers and various pressure vessels.
Reference standards
GB 241
Metal tensile test method
Metal pipe hydraulic test method
Metal pipe compression test method
GB4698
GB 6397
Chemical analysis method for titanium and titanium alloys
Metal tensile test specimens
GB8180
Packaging, marking, transportation and purchase and storage of titanium and titanium alloy processed products. GB/T3620.1 Titanium and titanium alloy grades and chemical composition GB/T3620.2 Permissible deviation of chemical composition of titanium and titanium alloy processed products 3 Product classification
Grade, state, specification
The brand, manufacturing method, supply state and specification of the product shall comply with the provisions of Table 1. Approved by the State Bureau of Technical Supervision on October 17, 1995 and implemented on March 1, 1996
(cold drawing)
5～10
≥>10～15
>15～20
20～30
>30～40
>40～50
>50~～60
>60~～80
>80～110| |tt||25, 27
31, 32, 33
6～10
>10～15
>15～20
>20~30
Note: ①“\” indicates the specifications that can be produced. ②) Product length is shown in Table 3.
3.2 Marking example
GB/T3624—1995
Wall thickness, mm
3 .2.1 Seamless pipes made of TA, in annealed state, with an outer diameter of 30mm, a wall thickness of 1.5mm and a length of 3500mm are marked as:
Seamless pipe TA0M30×1.5×3500GB/T3624--19953.2.2 Welded pipes made of TA1, in annealed state, with an outer diameter of 25mm, a wall thickness of 1.0mm and a length of 8000mm are marked as:
Welded pipe T A1M25×1.0×8000GB/T3624—19953.2.3 The welded-rolled tube made of TA2, in annealed state, with an outer diameter of 20mm, a wall thickness of 1.25mm and a length of 5Q00mm is marked as:
Welded-rolled tube TA2M20×1.25×5000GB/T3624—19954 Technical requirements
4.1 Chemical composition
GB/T 3624
The chemical composition of titanium and titanium alloy pipes shall comply with the provisions of GB/T3620.1. When the purchaser retests, the allowable deviation of the chemical composition shall comply with the provisions of GI3/T3620.2.
4.2 Dimensions and allowable deviations of dimensions
4.2.1 The allowable deviation of the outer diameter of the pipe shall comply with the provisions of Table 2. Table 2
≥10~30
Allowable deviation
5 0～80
>80~~100
Allowable deviation
The allowable deviation of pipe wall thickness shall not exceed ±12.5% of its nominal wall thickness. The allowable deviation of pipe wall thickness does not apply to the welded pipe 4.2.2
weld.
4.2.3 The length of the pipe shall comply with the provisions of Table 3. Table 3
Seamless pipe
Unfixed length
500~4 000
500～9 000
0.5~~1.25
Welded pipe
>1.25~2.02.0~-2.5
500~6000
500~~15 000|
500--4000
Welded-rolled pipe
500~8 000
>0. 8-~2. 0
500-~5 000
4.2.4 The fixed length or multiple length of the pipe shall be within the range of its non-fixed length. The allowable deviation of the fixed length is +10mm, and the multiple length shall also include the incision amount when the pipe is cut, and each incision amount is 5mm. 4.2.5 The ends of the pipes shall be cut flat. Under the condition that the length deviation is allowed, the bevel cutting shall comply with the provisions of Table 4. Table 4
>30~60
2-60~110
4.2.6 The curvature of the pipes shall comply with the provisions of Table 5Table 5
Outer diameter, mm
>30~~110
Not more than
Curvature, mm/m
4.2.7 The out-of-roundness and uneven wall thickness of the pipes shall not exceed the allowable deviation of the outer diameter and wall thickness. 4.3 Mechanical properties
Not more than
The room temperature mechanical properties of the pipes shall comply with the provisions of Table 6, and the residual elongation stress 01.2 shall be tested only when the purchaser requires and indicates it in the contract.
4.4 Process properties
4.4.1 Flattening test
Annealed state
GB/T 3624
Tensile strength
280-420
370-530
440~620
370~-530
Specified residual elongation stress
≥250
≥250
Elongation.
La - 3) mm
4.4.1.1 Flattening test can be carried out when required by the purchaser and specified in the contract. The specimen should be intact after flattening. The value of the plate spacing H is calculated according to formula (1).
Where: H
Pressing plate spacing, mm;
t--Nominal wall thickness of pipe, mm;
D--Nominal outer diameter of pipe, mm;
(l +e)t
Constant, its value is 0.07 for TA0 and TA1; 0.06 for TA2 and TA9; 0.04 for TA10 when the outer diameter is not greater than 25mm; 0.06 when the outer diameter is greater than 25mm.2 The direction of the pressure fan of the welded pipe and the position of the weld are shown in the figure. 4.4.1.2
Direction of pressure fan
4.4.2 Water (gas) pressure test
4.4.2.1When the purchaser requires and specifies in the contract, the pipe can be subjected to water or gas pressure test. The selected test method and the selected water test pressure shall be specified in the contract. If not specified in the contract, the supplier may not conduct the test, but must ensure that it meets the minimum water pressure or air pressure test requirements in 4.4.2.2.
4.4.2.2 The pressure P value of the water pressure test shall be calculated according to formula (2); or the supplier and the buyer may negotiate and select 1.5 times of 5MPa as the pressure or other pressures.
Where: P test pressure, MPa,
nominal wall thickness of pipe, mm;
D/2- 0. 4t
allowable stress, for TA0, TA1, TA2, TA9, its value is 50% of the minimum specified residual elongation stress of the grade, for TA10, its value is 40% of the minimum tensile strength, MPa; 1)... nominal outer diameter of pipe. mm;
GB/T3624-1995
E is a constant, 0.85 for welded pipe and welded-rolled pipe, and 1.0 for seamless pipe. During the test, the pressure is maintained for 5s, and the pipe should not be deformed or leak. For pipes with an outer diameter of no more than 76mm, the maximum pressure of the water pressure test should not be greater than 17.2MPa; for pipes with an outer diameter greater than 76mm, the maximum pressure of the water pressure test should not be greater than 19.3MPa4.4.2.3 The pressure of the internal air pressure test of the pipe is 0.7MPa, and the pressure is maintained for 5s during the test. The pipe should not leak. 4.5 Surface quality
4.5.1 The inner and outer surfaces of the pipe should be clean and should not have cracks, folds, peeling, pinholes and other defects visible to the naked eye. 4.5.2 Local defects on the surface of the pipe can be removed, but after removal, the outer diameter and wall thickness shall not exceed the allowable negative deviation. 4.5.3 The surface of the pipe is allowed to have scratches, pits, internal points and straightening marks that do not exceed the allowable deviation of the outer diameter and wall thickness. The different colors of the pipe after pickling are not used as the basis for scrapping. 5 Test methods
5.1 Chemical composition arbitration analysis method
The chemical composition arbitration analysis of the pipe is carried out in accordance with GB4698. 5.2 Mechanical property test method
The warm tensile test of the pipe is carried out in accordance with GB228. For pipes with an outer diameter not greater than 35mm, the S8 specimen in GB6397 is selected; for pipes with an outer diameter greater than 35mm, the S1 specimen is selected. 5.3 "T. Process performance test method
5.3.1 The collapse test shall be carried out in accordance with GB246.
5.3.2 The water pressure test shall be carried out in accordance with (B241.
5.3.3 The air pressure test may be carried out in accordance with the method agreed upon by the supply and demand parties.5.4 Dimension measurement method
Dimension detection shall be carried out with measuring tools of corresponding accuracy.5.5 Surface quality inspection
Surface quality shall be inspected visually.
6 Inspection rules
6.1 Inspection and acceptance
6.1.1 The pipe shall be inspected by the supplier's technical supervision department to ensure that the product quality complies with the provisions of this standard and fill in the quality certificate.6.1.2 The purchaser may accept the received products in accordance with the provisions of this standard. If the inspection result does not comply with the provisions of this standard, it shall be reported to the supplier within three months from the date of receipt of the product and the supply and demand parties shall negotiate to resolve the problem.6.2 Group batch
The pipe shall be Submit for acceptance in batches. Each batch shall consist of products of the same brand, smelting furnace number, specification, manufacturing method, state and the same heat treatment furnace batch.
6.3 Inspection Items
Each batch of pipes shall be inspected for chemical composition, dimensional deviation, mechanical properties and surface quality. The inspection items specified in the contract shall also be inspected. www.bzxz.net
6.4 Sampling Position and Sampling Quantity
6.4.1 The chemical composition shall be sampled by the supplier on the ingot. Analysis, the purchaser can take samples from the pipe for analysis. 6.4.2 Room temperature mechanical properties test, take two pipes from each batch and take a sample from each. 6.4.3 Pressure test, take two pipes from each batch and take a sample from each. 6.4.4 Water (gas) pressure test should be carried out pipe by pipe. 6.4.5 The surface quality and external dimensions of each pipe should be inspected. For pipes with an inner diameter of less than 20mm, it is allowed to use 523
GB/T 3624--1995
Take 5 pipes at random, take a 150mm pipe section from each pipe, cut it in half longitudinally, measure the wall thickness and inspect the inner surface instead of inspecting each pipe one by one. 6.5 Retest
In the room temperature mechanical properties, flattening test and pipe section test of 6.4.5, if one sample fails the test result, take double samples from the batch to retest the unqualified item. If one sample still fails the retest result, the whole batch shall be scrapped or the unqualified items shall be inspected one by one, and the qualified ones shall be re-batch. 7 Marking, packaging, transportation and storage
7.1 Product marking
The following markings shall be made on the inspected pipes (or packaging boxes): a.|| tt||Product brand;
b. Supply status;
c. Batch number;
d. Standard number.
7.2 Packaging, packaging marking, transportation and storage The packaging, packaging marking, transportation and storage of products shall comply with the provisions of GB8180. 7.3
Quality certificate
Each batch of pipes shall be accompanied by a quality certificate, indicating: a.
Name of supplier;
Product name;
Product brand, specification, manufacturing method and status; melting furnace number, batch number, batch weight and number of pieces; the specified analysis and test results and the stamp of the technical supervision department: this standard number;
Packaging date.
Additional instructions:
This standard is proposed by China Nonferrous Metals Industry Corporation. This standard is drafted by Baoji Nonferrous Metals Processing Plant. The main drafters of this standard are Zhang Yansheng, Feng Yu, Meng Qinglin, Wang Baosheng and Yang Lijuan.
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