GB/T 8892-1988 Tin bronze tube for pressure gauge GB/T8892-1988 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Tin bronze tube for pressure-gauge
Bronze tube for pressure-gauge This standard applies to tin bronze tubes for pressure gauges and other instruments. 1 Varieties
1.1 Brand, state, specification
The brand, supply state and specification of the pipe shall comply with the provisions of Table 1,
QSn6.5-0.1
1.2 Dimensions and allowable deviations
Supply state
Hard (Y)
Soft (M)
The cross-sectional dimensions of round pipes (see figure) are listed in Table 2. 1.2.1
China National Nonferrous Metals Industry Corporation approved UDC 669.65'
35'6-462
GB 8892 --- 88
Specifications, mm
Round tube (4~25)×(0.15~1.80)
Oval tube (5~15)×(2.56)×(0.15~.0)Flat tube (7.5~20)×(5-7)×(0.151.0)Oval tube
198902-01 implementation
Outer diameter D
14(14.34)
≥20~25
0.15 ~0.30
GB 8892---88
≥0.30~0.500.50~0.80≥0.80~1.00≥1.00~1.30≥1.30 ~-1.501.501.80O
Note: “\” indicates product, “-” indicates no product, and the outer diameter specification in brackets indicates the restricted use specification. 1.2.2 The cross-sectional dimensions of flat tubes and oval tubes (see figure) are listed in Table 3. Table 3
Oval tube
Major axis A
Wall thickness s
0. 15 ~~ 0. 25
>0. 25 ~0. 40
>0. 40~0.60
>0. 60 ~0. 80
>0. 80 ~1. 00
0. 15 ~~ 0. 25
0. 25~0. 40
>0. 40~0. 60
>0. 60 ～0. 80
>0. 80~1. 00
The allowable deviation of the outer diameter of round tubes shall comply with the provisions of Table 4. R
Allowable deviation
GB8892—88
>5.56~9.52≥9.52~12.6≥12.6~15 0.05
The allowable deviation of wall thickness of circular pipes shall comply with the provisions of Table 5. Table 5
Wall thickness S
Ordinary precision
Higher precision
≥15~19. 5
>19. 5~-20
=20 ～25
0. 15~0. 300. 30~0. 50>0.50~0. 80>0. 80~1. 00≥1. 00~1.30≥1.30~1. 50≥1. 50~~1.80±0.03
The allowable deviation of the dimensions of flat tubes and elliptical tubes shall comply with the provisions of Table 6. Table 6
Major axis A
Oval tube
Minor axis B
Allowable deviation of wall thickness
0.15~~0.25
>0.25~0.40
≥0. 40~0. 60
>0. 60~0. 80
≥0. 80 ~1. 00
Other cross-sectional dimensions and allowable deviations can be supplied through negotiation between the two parties. Ordinary precision
Higher precision
1.2.7 The length of irregular length supply is 10000~40000mm. The length of fixed length or multiple length (agreed in the contract) should be within the range of irregular length, and the allowable deviation of length is +5mm. The multiple length should include the sawing amount when sawing segments, and each sawing amount is 5mm. 1.2.8 The ends of the pipes should be sawn flat and free of burrs. The bevel should be within the length tolerance. 1.2.9 The curvature of hard pipes should not exceed 5mm per meter. 1.2.10
The out-of-roundness of hard round pipes should not exceed the outer diameter tolerance. The uneven wall thickness of the pipe should not exceed the wall thickness tolerance. 1.3 Marking examples
Example 1: The hard ordinary precision and higher precision round tubes made of QSn4-0.3 with an outer diameter of 20mm and a wall thickness of 1.0mm are marked as follows:
Tube QSn1-0.3Y ±20X1.0 GB 8892.- 88Tube QSn4-0.3Y higher $20X1.0GB8892—88Example 2: The soft ordinary precision and higher precision flat tubes made of QSn6.5-0.1 with a major axis A of 20mm, a minor axis B of 6mm and a wall thickness of 1.0mm are marked as follows:
Tube QSn6.5-D.1M flat 20X6X1.0 GB 8892- 88 tube QSn6.5-0.1M flat high 20×6×1.0GB8892-88
Example 3: The hard ordinary and relatively separated oval tubes made of QSn4-0.3 with a long axis A of 15mm, a short axis B of 5mm and a wall thickness of 0.7mm are marked as:
Tube QSn4-0.3Y oval 15×5X0.7GB 8892-88Tube QSn4-0.3Y oval high 15×5×0.7GB8892-882 Technical requirements
2.1 The chemical composition of the tube shall comply with the provisions of QSn10.3 and QSn6.5-0.1 in GB5233-85 "Chemical composition and product shape of processed bronze".
GB8892-88
The room temperature longitudinal mechanical properties of the tube shall comply with the provisions of Table 7. Table 7
QSn4 0. 3
QSn6. 5-0. 1
Material statewwW.bzxz.Net
Soft (M)
Hard (Y)
Tensile strength 5
N/mm*(kgf/mm*)
323~480
(33～49)
490~637
(50~65)
2.3The inner and outer surfaces of the pipe should be smooth and clean. There should be no cracks, pinholes, peeling, bubbles, inclusions and green rust, elongation, %
not less than
Minor, local scratches, pits, spots and other defects that do not make the outer diameter and wall thickness of the pipe exceed the allowable deviation are allowed. Minor, local water marks and dark colors are not used as scrapping basis. 3 Test methods
3.1 The chemical analysis arbitration method of the pipe shall be carried out in accordance with the provisions of GB8002--87 "Chemical Analysis Method of Tin Bronze". 3.2 The room temperature tensile test method of the pipe shall be carried out in accordance with the provisions of GB228--87 "Methods for Metal Tensile Test". 3.3 The appearance of the pipe shall be inspected by naked eyes. 3.4 The outer dimensions of the pipe shall be measured by the outer diameter scale, wall thickness micrometer, vernier caliper, steel tape measure, etc. It is allowed to measure with other testing tools that can ensure the measurement accuracy. Inspection rules
The pipe shall be inspected and accepted by the supplier's technical supervision department, and the product quality shall be guaranteed to meet the requirements of this standard. 4.1
4.2 The pipe shall be submitted for inspection in batches, and each batch shall consist of the same brand, state and specification, and the batch weight shall not exceed 250kg. The purchaser shall inspect the received products. When the inspection results do not meet 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.
4.3 Sampling quantity
4.3.1 Appearance and dimension inspection: not less than 10 tubes per 50kg. 4.3.2 For room temperature tensile test, two tubes are randomly selected from each batch and one specimen is taken from each tube. 4.4 Even if the test result of each test specimen is unqualified, double the number of specimens shall be taken from the batch for re-inspection of the unqualified item. If one specimen is still unqualified after the re-inspection, the entire batch shall be scrapped or inspected tube by tube. The qualified ones shall be accepted in a separate batch. 5 Marking, packaging, transportation and storage
The marking, packaging, transportation and storage of pipes shall be carried out in accordance with the provisions of GB8888-88 "Packaging, marking, transportation and storage of heavy nonferrous metal processing products".
Additional notes:
This standard was drafted by Shanghai Second Copper Tube Factory. From the date of implementation of this standard, the former Ministry of Metallurgical Industry standard YB 712-78 "Pressure Gauge Tube" shall be invalid. 5.12
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