This standard specifies the test preparation, sample etching, structure inspection, defect classification, test records, etc. for macrostructure inspection of deformed aluminum and aluminum alloy ingots and processed materials and products. This standard is applicable to macrostructure inspection of deformed aluminum and aluminum alloy ingots and processed materials and products. GB/T 3246.2-2000 Macrostructure inspection method for deformed aluminum and aluminum alloy products GB/T3246.2-2000 Standard download decompression password: www.bzxz.net

ICS77.040.30
National Standard of the People's Republic of China
GB/T 3246.1~3246.22000
Wrought aluminum and aluminum alloys products inspectionmethod for structure
2000-06-09 Issued
2000-11-01 Implementation
State Administration of Quality and Technical Supervision Issued
GH/T 3246.2—2000
This standard is compiled in accordance with the format requirements of CB/T 1.1-1993. It includes preface; Chapter 1 Standard application; Chapter 2 Sample preparation; Chapter 3 Organization inspection; Chapter 4 Defect classification; Chapter 5 Inspection record. This standard is a revision of CB/T3247-1982 standard for the inspection method of deformation pliers and aluminum alloy macrostructure. Compared with the previous version, the main changes are: 1) Added the inspection method of casting metallurgical defects. 2] Added the inspection method of finished products such as rolled plates. 3] Some of the figures in the original standard were revised, and the grain size grade of the cast rolled plate was added to the grain size content, and the looseness grade figure of the ingot was added.
4) The 0.67g in the grain size measurement formula of the original standard was changed to 0.5g. This standard will replace GB/T3247-1982 from the date of entry into force. This standard was proposed by the State Bureau of Nonferrous Metals Industry. This standard is under the jurisdiction of the China Nonferrous Metals Industry Standard Quality Research Institute. The main drafters of this standard are: Northeast Light Alloy Co., Ltd., and the main drafters of this standard are Han Yutian, Wang Xiaoquan, Zheng Tao, Xiang.
The standard was first issued in 1982. bzxZ.net
1 Scope
National Standard of the People's Republic of China
Wrong aluminum and aluminum alloy products inspection method for inacrostructure GB/T 3246.2—2000
Replaces GH/T3247—1982
This standard specifies the preparation of samples, sample decay, structure inspection, defect classification, test records, etc. for the macrostructure inspection of wrought aluminum and lead alloy ingots and processed materials and products.
This standard is applicable to the macrostructure inspection of wrought aluminum and lead alloy cast chains and processed materials and products. 2 Sample preparation
2.1 Sampling
2. 1.1 The ingot test piece shall be cut off the head and tail to the specified length, and then cut along the transverse direction of both ends. Its specification is 25mm±5mm thick. 2.1.2 Check the chain oxide film. Cut the length of the test piece at the end of the cast chain to 50mm, 50mm, and 150mm respectively, and cut it into a test cake with a thickness of 30**mm from the height of 150mm. 2.1.3 Extruded product samples are cut horizontally at the end of the extrusion K, and the specification is 3mm±10mm thick. Special products are cut according to the requirements of the drawings.
Specimens for mirror parts (self-made parts and die-plated parts) should be cut from the parts specified in their respective technical drawings. 2.1.5 Forgings and die-forged parts, fracture inspection specimens should be sampled from the parts specified in the technical drawings. For squeezed products, the specimens after low-structure inspection can be used instead.
2.1.6 The low-magnification specimen for inspecting the coarse-grained ring should be sufficiently hot. 2.1.7 Cut a 30mm wide strip along the horizontal front at the rear end of the plate, and then cut it into several sections longitudinally to check the plate stratification. 2.2 Sample processing
2.2.1 All inspection surfaces of low-bored test pieces shall be milled and their roughness shall not be less than 3.2 mm. Other processing methods may also be used without reducing the inspection effect. 2.2.2 Oxide film test piece: Saw it into two pieces along the diameter direction on the cake, and plan it on the side. The depth of the incision shall ensure that the inspected surface is not less than 2000 mm2.
2.2.3 Fracture test piece: Cut it at the fracture site. For the test piece with too small size or strange shape, it shall be processed into a stem-shaped groove. The cutting depth shall not exceed 1/3 of the thickness.
2.2,4 After the fracture specimen and the oxide film specimen are slotted, they should be newly fractured or group-fractured in the press F, as shown in Figure 1. 2.2.5 The specimens after systematic processing and fracture should be kept clean and free of contamination. 2.2.6 The thickness of the specimens of low-magnification coarse-grained rings cut from the extrusion state should be greater than 5mm when milling before processing after annealing. 2.2.7 The grain size inspection specimens of plates and strips should use the natural surface of the processed products. 2.3 Specimen Etching
2.3.1 Alkaline Etching
Approved by the State Administration of Quality and Technical Supervision on June 9, 2000, and implemented on November 1, 2000
GB/T 3246.2—2000
2.3.1.1 For low-magnification specimens of aluminum and aluminum alloy castings, the alkaline etching process should refer to Table 1 The requirements of the test should be followed and the defects of the structure should be clearly shown.
Alloy grades
5A02.5A03, 5083.5A05.5A06, 5B05, 5A12.5052, 3003, 3421, 64025056
2217.2401, 2A2.2A04.2A06.2B11.2R12, 2017, Z024, 2A1 0,2A11,2A12,2A13.2A14,2A16.ZA17,7A03,7A(4,7A05,7075,7A09,7A10,2AN),40326061,6063
NaOH bath concentration
80~120g/1.
Nao dissolving temperature, 9
no nucleation
20 ~ 30
The alkaline etching process of low-magnification specimens of lead and aluminum alloy products should refer to the provisions of Table 2, and should be based on the clear display of structure or defects.
The alkali etching time of the specimens for checking welds and chemical films should be increased by 1 to 2 times accordingly. Table 2
Hexi brand
3A21.5A05.3003,S0S2
6.402.5A03.5 A05, 5A06.2A50, 2A80, 2A02, 50562A11, Z.A12, 2A16, 2A17, 7A(4, 7A09, 2017, 20144032, 7075
2.4 Pickling
YaDH Grade concentration
150 - 250g/L
NaOH solution
Etching time
25 ~30
5 -- 25
10 - 20
2.4.1 After alkali washing, the sample should be quickly transferred to flowing clean water (from rice water) for rinsing, and then placed in 20%~30% (V/V) HNO solution for light washing to remove the colorless alkali corrosion products, and finally rinsed with flowing clean water before inspection. 2.5 Appearance of crystal number
2.5.1 When the grain size of soft alloy products is to be inspected, they should be etched in a mixture of nicotine acid with the following composition: 42% (V/V)
37% (V/V) IC
65% ~ 68% (V/V) IVO, 25ml
Put the sample in the etchant for a suitable time and immediately rinse with water. This process can be repeated several times until the grains are clearly visible. 2.5.2 When the grain size of hard alloy products is to be inspected, one of the following three etchants can be used for radial etching at room temperature until the grains are clearly visible.
±)150250g/LNaOH aqueous solution
b) High concentration technical acid
42% HF
36%~38%(V/V)IC)
65% -68%(V/V)HN)
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