This standard applies to seamless aluminum cylinders made from cast billets by strong spinning. Seamless aluminum cylinders are used as concentrated nitric acid (concentration ≥ 98%) bleaching tower bodies. GB/T 8645-1988 Spinning seamless aluminum cylinders GB/T8645-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Seamless aluminium cylinder produced by power spinningUDC 669. 71
GB8645--88
This standard applies to seamless aluminium cylinders produced from casting blanks by power spinning. Seamless aluminium cylinders are used as the tower body of concentrated nitric acid (concentration ≥ 98%) bleaching towers.
Variety, specification
The model of the product is XWL-I, "XWL" is the Chinese phonetic prefix of "spun (pressed) seamless (seamless) aluminum (tube)". 1.2 Brand, state, specification
The brand, state and specification of the product shall comply with the provisions of Table 1. Table 1bZxz.net
1.3 Size allowable deviation
The size allowable deviation of the product shall not be greater than the provisions of Table 2. Model
1.4 Marking example
The mark of the spun seamless aluminum tube is:
XWL-IGB8645-88.
2 Technical requirements
2.1 Chemical composition
No degree
The chemical composition of the spun seamless aluminum tube shall comply with GB3190-82 "Chemical composition of aluminum and aluminum alloy processed products". 2.2 Macrostructure
2.2.1 The macrostructure of the spun seamless aluminum cylinder is not allowed to have cracks, pores and inclusions. 2.2.2 The macrostructure of the spun seamless aluminum cylinder should not have casting structure. Approved by China National Nonferrous Metals Industry Corporation on 1988-0111 and implemented on 1989-01-01
2.3 Surface quality
GB8645-88
2.3.1 The inner surface of the spun seamless aluminum cylinder should be smooth and flat, and no macroscopically visible cracks, pores, looseness, slag inclusions and oil stains are allowed. Scratches and indentations are allowed, but the depth shall not exceed 1mm. 2.3.2 The outer surface of the spun seamless aluminum cylinder should be smooth and flat, and local scratches, abrasions, bumps and indentations are allowed. , indentations, peeling, but the depth shall not exceed 1mm
2.3.3 The surface of the spun seamless aluminum cylinder is allowed to have oxidation color. 3 Inspection method
3.1 Chemical composition analysis method
The chemical composition analysis method of the spun seamless aluminum cylinder shall be carried out in accordance with GB6987.1~6987.21-86 "Chemical Analysis Methods for Aluminum and Aluminum Alloys".
3.2 Dimension inspection method
3.2.1 The inner diameter, wall thickness and length of the spun seamless aluminum cylinder are measured with an inside diameter micrometer, a wall thickness micrometer and a steel ruler respectively. 3.2.2 Place the spun seamless aluminum cylinder on a universal flat plate (grade 3) and measure the straightness with a feeler gauge. 3.3 Surface quality inspection method
The surface quality of the spun seamless aluminum cylinder is inspected with the naked eye. . 3.4 Defect depth measurement method
When measuring the surface defect depth of spun seamless aluminum billets, the burrs need to be polished off before measurement. 3.5 Macrostructure inspection method
The macrostructure inspection of spun seamless aluminum billets shall be carried out in accordance with GB324782 "Macrostructure inspection method for aluminum and aluminum alloy processed products". 4 Inspection rules
4.1 Inspection and acceptance
Spun seamless aluminum billets 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. 4.2 Batch
Spun seamless aluminum billets are batched with 10 sections. If there are less than 10 sections, they shall be calculated as one batch. 4.3 Inspection items
4.3.1 Each section of spun seamless aluminum billets shall be inspected for dimensional deviation, surface quality, and chemical composition. 4.3.2 Take any one section from each batch of spun seamless aluminum billets for macrostructure inspection. 4.4 Sampling position and number of samples
4.4.1 Two low-magnification tissue samples are randomly cut from the tail end of the spun seamless aluminum billet. 4.4.2 Chemical composition analysis samples are sampled in front of the furnace and cast test bars are used. 4.5 Dimension inspection position
4.5.1 When measuring the wall thickness of the spun seamless aluminum billet, take a position 20mm away from the two ends and measure the maximum and minimum values ​​of the wall thickness in the circumferential direction.
4.5.2 When measuring the inner diameter of the spun seamless aluminum billet, take a position 200mm away from the two ends and measure the maximum and minimum values ​​of the inner diameter. 4.6 Repeat inspection
If one sample fails in each analysis and inspection result, take another double sample to repeat the test of the unqualified item. If there is still one sample that fails, each batch of aluminum billets will be inspected one by one. 5 Marking, packaging, transportation and storage
5.1 Marking
The packaging marking of spun seamless aluminum sheets shall comply with the provisions of GB3199-82 "Packaging, marking, transportation and storage of aluminum and aluminum alloy processed products".
5.2 Packaging
GB 8645-88
When spun seamless aluminum sheets are packaged, both ends are sealed with wooden boards, the inside of the sheets is supported by wooden frames, connected and fixed to each other, and the outside is wrapped with straw ropes or straw mats. 5.3 Transportation and storage
The transportation and storage of spun seamless aluminum sheets shall comply with the provisions of GB3199-82. 5.4 Quality Certificate
Each section of spun seamless aluminum cylinder shall be accompanied by a quality certificate, which shall indicate: a.
Name of supplier;
Product model, specification and status;
All analysis and inspection results and inspection department stamp; Number of packages;
Number of this standard:
Date of packaging.
If the purchaser has other requirements for the product or the product is out of specification, the supply and demand parties shall agree on additional remarks:
This standard was drafted by Beijing General Research Institute of Nonferrous Metals. The main drafter of this standard is Lu Jianhuai.
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