This standard is applicable to the sampling method for samples used for emission spectrometry analysis of cast steel, cast iron, cast aluminum alloy, cast copper alloy and cast zinc alloy. GB/T 5678-1985 Sampling method for spectrometry analysis of cast alloys GB/T5678-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Spectroscopic Analysis of Casting Alloys
Sampling Method
Methodforsamplingcastalloys
for spectrochemical analysisUDC621.741.9
:543.42.05
GB 5678—85
This standard applies to the sampling method for samples for emission spectroscopic analysis of cast steel, cast iron, cast aluminum alloy, cast copper alloy and cast zinc alloy. 1 Sampling conditions and quantity
1.1 The test blocks for analysis should be cast with molten metal from the same furnace during the casting process. 1.2 For each batch of castings, one test block is generally cast. When the manufacturer produces castings for the buyer, two test blocks are cast for each batch of castings, one for the manufacturer to inspect and one for the buyer to re-inspect when it is shipped with the castings. The batch size of castings is classified according to the relevant provisions of GB5676-85 "Casting Carbon Steel for General Engineering", GB5675-85 "Grade of Gray Cast Iron" and JB2702-80 "Technical Conditions for Zinc Alloy, Aluminum Alloy and Copper Alloy Die Castings".
1.3 The number of sampling times for large castings can be agreed upon by the buyer and the manufacturer. 2 Test Blocks and Castings
2.1 Except for the use of cast test blocks on castings agreed upon by the manufacturer and the buyer, single cast test blocks are generally used to prepare spectral analysis samples. 2.2 Use metal molds (iron or steel, the same below) to cast cylindrical or truncated conical test blocks. The shape and size of the castings are shown in Figures 1 and 2. Issued by the National Bureau of Standards on December 4, 1985
Implemented in September 1986
GB5678-85
Integral metal mold for casting truncated cone test block
Figure 2
Vertical split metal mold for casting cylindrical test block
2.3 A combined casting mold with a refractory sleeve as the upper mold and a copper chill block as the lower mold is used to cast the cylindrical test block. The shape and size of the combined casting mold are shown in Figure 3. The refractory sleeve can be made of water glass sand, resin shell sand or refractory ceramic. The copper chill block is made of pure copper (the same below). 136
GB5678-85
Figure 3 Combination casting mold of refractory sleeve and copper chill block for casting cylindrical test block 2.4 Casting of disc spectrum analysis test block with a dish-shaped metal mold. The shape and size of the mold are shown in FIG4. :70
Figure 4 Disc-shaped metal mold for casting disc analysis test block 137
GB567885
2.5 A composite mold with a metal mold with exhaust grooves as an upper mold and a copper chill block as a lower mold is used to cast a test block that can cut a thin disc sample. The shape and size of the mold are shown in FIG5.
Chiller block
Figure 5 Composite mold for casting thin disc test block
GB5.67885
2.6 A composite mold with a water glass sand upper mold and a copper chill block as a lower mold is used to cast a test block that can cut a disc analysis sample. The shape and size of the mold are shown in FIG6.
For gray cast iron, when gray cast iron structure samples must be used for analysis, refractory bricks or sand molds can be used as the lower mold instead of the copper chill block.
Figure 6 Combination casting mold for casting disc test block
2.1 For various casting alloys, test blocks shall be cast according to the following terms. Casting alloy
Casting aluminum alloy
Casting copper alloy
Casting zinc alloy
2.8 When the buyer needs to use spectral analysis, the test block shape and casting mold shall be specified in the agreement between the two parties. Otherwise, it shall be selected by the manufacturer! 139
3 Casting of test blocks
GB5678—85bzxz.net
3.1 The capacity of the steel sampling spoon shall be sufficient to cast 3 to 4 test blocks. Before sampling, the sampling spoon shall be baked and preheated in advance. 3.2 If necessary, the casting mold may be coated with appropriate refractory coating. Before pouring, the casting mold shall be baked and preheated to about 300℃. When casting test blocks according to 2.3, 2.5 and 2.6, the outer gap between the upper mold and the lower mold may be sealed with mud. 3.3 The molten metal in the sampling spoon is poured into the casting mold after slag removal. The amount of injection should be controlled so that the metal liquid level is 3~5mm lower than the top surface of the cavity. 3.4 For the furnace analysis of cast steel, an appropriate amount of pure aluminum can be added for deoxidation if necessary, but the total amount of aluminum remaining in the sample shall not exceed 0.25%.
Note: Generally, 1.0~1.5 grams of aluminum is added per kilogram of molten steel. Aluminum wire with a purity of more than 98% and a diameter of 3mm can be used in double strands, twisted into a spiral shape according to the required amount, and directly inserted into the molten steel in the sampling spoon. 3.5 After the poured test block solidifies, it is taken out of the casting mold, water-cooled or air-cooled, and the furnace number or batch number is marked. 3.6 After each sampling, the sampling spoon and casting mold should be cleaned, and no metal and slag from the previous sampling should remain. 4. Preparation of samples
4.1 Cutting the spectroscopic analysis sample from the test block
4.1.1 For the cylindrical and truncated conical test blocks cast according to 2.2 and 2.3, use a grinding wheel cutter to cut the plane sample. The height of the cut sample (measured from the chilled surface at the bottom of the test block upward) is 13-15 mm for the test blocks cast according to 2.2 (Figure 1) and 2.3, and 18-20 mm for the test blocks cast according to 2.2 (Figure 2). Use this cut surface to prepare the working surface of the spectroscopic analysis sample. 4.1.2 For the disc analysis test block cast in a dish-shaped metal mold according to 2.4, use the chilled surface at the bottom of the test block to prepare the working surface of the spectroscopic analysis sample.
4.1.3 For the test blocks cast according to 2.5 and 2.6, use a hammer, grinding wheel cutter or saw to remove the disc part from the test block, and use the chilled surface at the bottom to prepare the working surface of the spectroscopic analysis sample. 4.2 Preparation of the working surface of the spectral analysis sample
4.2.1 Cast steel and cast iron samples are processed by grinding wheel or belt grinding. Alumina or silicon carbide grinding tools can be selected as needed. 4.2.2 Aluminum alloy, copper alloy and zinc alloy samples are processed by lathe or milling machine with carbide tools. 4.2.3 The cutting surface of the grinding wheel cutter is used as the working surface of the spectral analysis sample, and the spectral plane is polished. When the original chilled casting surface is used as the working surface of the spectral analysis of the sample, it should be polished or cut off 1.3~1.6mm. 4.3 The working surface of the processed spectral analysis sample should be flat and smooth, and should not have pores, sand holes, shrinkage cavities, shrinkage, burrs, cracks and inclusions.
5 Standard sample
5.1 When performing spectral analysis, it is best to use a standard sample prepared in the same way as the analysis sample. 5.2 When using a standard sample prepared by a different method from the analytical sample, it must be verified or a control standard sample prepared by the same method as the analytical sample must be used to control the analysis.
6 Safety Precautions
6.1 When sampling, the sampling spoon and the casting mold must be dried and preheated in accordance with the provisions of 3.1 and 3.2. 6.2 When sampling, the operator must take appropriate labor protection measures. 7 Preservation of Spectral Analysis Samples
The manufacturer produces castings for the buyer. After the analysis of the analytical samples, the manufacturer should preserve them until the end of the re-inspection period agreed by both parties. 110
Additional Notes:
GB5678--85
This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of Shenyang Foundry Research Institute. This standard was drafted by Shenyang Foundry Research Institute and other units. The main drafter of this standard is Zhou E-sun.
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