This standard specifies the method for determining the carbon content of nickel-chromium and nickel-chromium-iron alloys by gas volumetric method. This standard is applicable to the determination of carbon content in nickel-chromium and nickel-chromium-iron alloys. Determination range: 0.050% to 0.200%. JB/T 6326.10-1992 Chemical analysis method for nickel-chromium and nickel-chromium-iron alloys Gas volumetric method for determination of carbon content JB/T6326.10-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Chemical analysis method for nickel-chromium and nickel-chromium-iron alloys Gas volumetric method for determination of carbon content
Main content and scope of application
JB/T6326.1092
This standard specifies the method for determining the carbon content of nickel-chromium and nickel-chromium-iron alloys by gas volumetric method. This standard is applicable to the determination of carbon content in nickel-chromium and nickel-chromium-iron alloys. The determination range is: 0.050%~0.200%. 2 Reference standards
GB1467 General principles and general provisions for chemical analysis methods of metallurgical products. 3 Method summarybZxz.net
The sample is placed in a high-temperature furnace for heating and burning with oxygen to oxidize carbon into carbon dioxide. The mixed gas is desulfurized and collected in a gas measuring tube. Then the carbon dioxide is absorbed by potassium hydroxide solution. The difference in volume before and after absorption is the volume of carbon dioxide, and the carbon content is calculated from this. Reagents and Instruments
The schematic diagram of the instrument for determining carbon content by gas volumetric method is as follows:5
1-Oxygen cylinder
2-Chlorine gas meter
Diagram of the instrument and device for determining carbon
3-Buffer bottle
4-Gas washing bottle containing gas washing liquid (4.8), the amount of which is about one-third of the height of the bottle6-Drying tower, containing anhydrous calcium chloride (4.4)5-Gas washing bottle, containing sulfuric acid (4.3 ), the filling volume is about one third of the bottle height 9-spherical tube, filled with glass wool (4.6)
7-tube furnace
8-temperature automatic controller
12-ceramic boat (4.14)
10-desulfurization tube, filled with active manganese dioxide (2.7) 11-combustion tube
13-capacitance meter (including a. condenser, b. gas tube, te. level bottle, d. receiver). 4.1 Potassium hydroxide.
4.2 Saturated potassium permanganate solution.
4.3 Sulfuric acid (density pl.84g/ml).
Approved by the Ministry of Machinery and Electronics Industry on June 26, 1992 and implemented on January 1, 1993
4.4 Anhydrous calcium fluoride.
4.5 Alkali asbestos.
4.6 Glass wool.
Active manganese dioxide: granular.
JB/T6326.1092
Gas washing liquid: Take 30g potassium hydroxide and dissolve it in 70ml potassium permanganate saturated solution. 4.8
4.9 Sodium chloride (250g/L).
4.10 Methyl solution (1g/L).
4.11 Solution in the level bottle: Take 500~900ml sodium chloride solution (4.9), add 5~6 drops of sulfuric acid (4.3) and a few drops of methyl solution (4.10).
4.12 Potassium hydroxide absorption solution (400g/L). 4.13 Flux: tin granules or tin granules + reduced iron powder (1+1) (blank test before use) 4.14 Porcelain boat: 97mm long, must be burned in a 1200℃ tube furnace with oxygen for 2~4min before use, or burned in a 1000℃ high-temperature furnace for more than 1h, and stored in an ungreased desiccator for later use after cooling. 4.15 Mercury barometer.
5 Analysis steps
5.1 Sample quantity
Weigh 1.000g of sample.
5.2 Blank test
Perform a blank test with the sample.
5.3 Determination
5.3.1 Before analysis, first check the tightness of the instrument and calibrate it with a standard sample with a carbon content similar to that of the analyzed sample. 5.3.2 Place the sample in the porcelain boat and spread it evenly, cover it with about 2g of flux (4.13), open the rubber stopper, put the porcelain boat into the porcelain tube, and push it to the high temperature (1250~1300C) with a long hook. Immediately plug the rubber stopper, preheat for about 1~1.5min, and pass oxygen to burn (flow rate 1.0~1.5L/min). Rotate the piston to connect with the gas tube, and keep the liquid in the gas tube evenly descending. When the gas fills the zero mark on the horizontal scale at the lower end of the gas tube, stop passing oxygen, close the piston immediately, and keep the liquid level in the level bottle and the liquid level in the gas tube at the same level. Then press the mixed gas into the absorption bottle, and absorb it repeatedly twice to ensure that the carbon dioxide gas is completely absorbed and the remaining hydrogen returns to the gas tube. Close the piston, move the level bottle, so that its liquid level is at the same level as the liquid level in the gas tube, record the reading and the gas tube temperature, open the rubber stopper, and pull out the porcelain boat with a long hook, and then proceed to the next sample analysis. 6 Calculation of analysis results
Calculate the percentage of carbon by the following formula:
Where: Vi--reading of the burning sample; V. number of the blank test;
Yu--correction coefficient for temperature and pressure;
sample volume, g.
7 Allowable difference
The deviation of the analysis results between laboratories should not be greater than the allowable difference listed in the following table. 24
Additional instructions:
Carbon content
0.050:100
>0.100~0.200
JB/T6326.10-92
-3. 2..:
Allowable difference
This standard is proposed and managed by the Shanghai Electric Science Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Shaanxi Iron and Steel Research Institute and Shanghai Alloy Factory. The main drafters of this standard are Sun Shaoqing, Li Peili, Fang Lianfang,
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