Method for detecting aluminum content of high-manganese and high-aluminum steel by using direct-reading spectrum instrument

Abstract

The invention belongs to the technical field of alloy content detection, and particularly relates to a method for accurately detecting the Al content of high-manganese and high-aluminum steel by using a direct-reading spectrum instrument. According to the method, the high-purity and high-homogeneity high-manganese and high-aluminum steel standard sample is prepared through vacuum carbon deoxidation smelting, high-temperature homogenization treatment and high-temperature solution treatment; the method comprises the following steps: preparing a high-manganese high-aluminum steel standard sample solution and a series of Al concentration standard solutions, and accurately measuring the Al content of the high-manganese high-aluminum steel standard sample by using an ICP-AES instrument; exciting the high-manganese and high-aluminum steel standard sample by using a direct-reading spectrum instrument to obtain the spectral line intensity of the Al element when the Al contents are different; and finally, according to the measured Al content and the spectral line intensity of Al, establishing a working curve of the Al content in the direct-reading spectrometer. According to the method, the problem that the Al content of the high-manganese and high-aluminum steel cannot be accurately measured by a direct-reading spectrum instrument is solved, the repeatability and the stability of a measurement result are good, the requirement for rapid analysis in the production smelting process is met, and a guarantee is provided for industrial production of the high-manganese and high-aluminum steel.

Description

Technical Field

[0001] The present invention belongs to the detection method of metal element content, and particularly relates to a method for detecting the aluminum content of high-manganese and high-aluminum steel by using a direct-reading spectrometer. Background Art

[0002] Lightweighting has become an inevitable trend in the development of the automotive industry. Research shows that for every 1% reduction in vehicle weight, fuel consumption can be reduced by 0.7% and harmful emissions can be reduced by 0.4%. In addition to automobiles, equipment such as armored vehicles, ships, and aircraft also have an urgent need for lightweighting. The lightweighting of equipment can improve its mobility and speed, increase mileage, which is of great significance. Therefore, achieving lightweighting of automobiles for energy conservation and emission reduction, and weight reduction, speed increase, and range increase of equipment are the common goals of modern steel material scholars.

[0003] In this context, high-manganese and high-aluminum Fe-Mn-Al-C steel has emerged. As a light element, the addition of Al element to steel can reduce the average molar mass of steel and cause lattice expansion, thus greatly reducing the density of steel (for every 1% mass fraction of Al added to steel, the density is reduced by about 1.3%), achieving lightweighting of materials. At the same time, high-manganese and high-aluminum Fe-Mn-Al-C steel has advantages such as high strength, high toughness, and good fatigue performance. Therefore, high-manganese and high-aluminum Fe-Mn-Al-C steel is considered an excellent material for weight reduction of automobiles, armored vehicles, ships, etc.

[0004] As an important alloying element, Al has an important influence on the density and properties of high-manganese and high-aluminum Fe-Mn-Al-C steel, so the precise control of its content is crucial. Due to the active nature of Al and its easy burn-off, the Al-containing raw materials need to be added to the molten steel in batches during the smelting of this type of steel, and it is difficult to control the recovery rate of Al. Therefore, accurately measuring the Al content of molten steel is the key to precisely controlling the Al content of finished steel. At present, the main methods for measuring the Al content in steel are direct-reading spectrometry, inductively coupled plasma atomic emission spectrometry (ICP-AES), EDTA complexometric titration method, etc. The direct-reading spectrometry has the characteristics of fast analysis speed and wide application range. However, due to the lack of a working curve with a high Al content (>1%) in the direct-reading spectrometer, the measured value of the Al content of high-manganese and high-aluminum Fe-Mn-Al-C steel has poor stability and a large deviation from the true value, resulting in the finished steel not meeting the usage requirements. The ICP-AES method and the EDTA complexometric titration method have the advantages of high accuracy and high precision, and can accurately measure the Al content of high-manganese and high-aluminum Fe-Mn-Al-C steel. However, these two methods have complex operation steps and long detection time, which cannot meet the requirements of rapid analysis during smelting, seriously affecting production efficiency and increasing production costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for detecting the aluminum content of high-manganese and high-aluminum steel by using a direct-reading spectrometer in view of the above-mentioned prior art, which can accurately determine the aluminum content in high-aluminum-content steel, solve the problem that the direct-reading spectrometer cannot accurately determine the Al content in high-manganese and high-aluminum steel, realize the rapid and accurate determination of the Al content in high-manganese and high-aluminum steel, and has simple operation and stable measurement results, meeting the requirements of rapid analysis in the smelting production process. At the same time, the accurate control of the Al content in the finished steel is realized, which has important significance for the industrial production of high-manganese and high-aluminum steel.

[0006] The present invention provides a method for accurately detecting the Al content of high-manganese and high-aluminum steel by using a direct-reading spectrometer, comprising the following steps: (1) Melting industrial pure iron, molybdenum-containing raw materials, graphite, manganese-containing raw materials, and electrolytic aluminum to obtain molten steel; (2) Subjecting the ingot obtained by casting the molten steel to high-temperature homogenization treatment and high-temperature forging in sequence to obtain high-manganese and high-aluminum steel forgings with different Al contents; (3) Subjecting the forgings to high-temperature solution treatment and machining in sequence, and obtaining high-manganese and high-aluminum steel standard samples with different Al contents and bright and clean surfaces after cleaning;

[0007] (4) Obtaining steel chips from the high-manganese and high-aluminum steel standard samples and cleaning them, weighing a quantitative amount of steel chips into a container, adding distilled water, digestion acid, and heating to completely decompose the steel chips, and obtaining a sample solution to be measured after volume fixation; (5) Weighing a quantitative amount of iron powder into a container, adding distilled water, digestion acid, and heating to completely decompose the iron powder; then adding different volumes of Al standard solution, and obtaining a series of concentration standard solutions of Al after volume fixation; (6) Measuring the series of concentration standard solutions of Al by using an ICP-AES instrument to obtain a working curve of Al content; (7) Measuring the Al content in the sample solution to be measured by using an ICP-AES instrument, and combining with the obtained working curve to obtain the Al content of the high-manganese and high-aluminum steel standard sample; (8) Exciting the high-manganese and high-aluminum steel standard samples with different Al contents by using a direct-reading spectrometer to obtain the spectral intensity of the Al element; (9) Establishing a working curve of Al content in the direct-reading spectrometer according to the spectral intensity of Al measured in step (8) and the Al content measured in step (6).

[0008] Preferably, the smelting includes the following steps: vacuum induction smelting industrial pure iron and molybdenum-containing raw materials (vacuum degree ≤ 40 Pa) to obtain basic molten steel; adding part of the graphite into the basic molten steel for vacuum carbon deoxidation (vacuum degree ≤ 40 Pa, time 8 - 12 min) to obtain pre-deoxidized molten steel; adding the remaining graphite, manganese-containing raw materials and electrolytic aluminum into the pre-deoxidized molten steel in sequence for alloying to obtain molten steel.

[0009] Preferably, the temperature of the high-temperature homogenization treatment is 1170 - 1230 °C, and the heat preservation time is 6 - 10 h.

[0010] Preferably, the temperature of the high-temperature solution treatment is 1150 - 1200 °C, the heat preservation time is 2 - 4 h, and the cooling method is water cooling.

[0011] Preferably, the digestion acid includes nitric acid and hydrochloric acid, and the decomposition method is: first add distilled water and nitric acid for heating and decomposition, after foaming, add hydrochloric acid, and then continue heating until the sample is completely decomposed.

[0012] Preferably, the concentration interval of the series of Al concentration standard solutions is 1 - 2 wt%.

[0013] Preferably, use an ICP - AES instrument to measure the Al content in the sample solution to be measured 3 - 5 times, and take the average value as the measurement result.

[0014] Preferably, use a direct-reading spectrometer to excite the high-manganese and high-aluminum steel standard sample 3 - 5 times, and take the average value of the spectral line intensity of the Al element as the measurement result.

[0015] The beneficial effects of the present invention are as follows: Through vacuum carbon deoxidation smelting, high-temperature homogenization treatment and high-temperature solution treatment, a high-purity and high-homogeneity high-manganese and high-aluminum steel standard sample can be prepared; by configuring a series of Al concentration standard solutions, it can ensure that the Al content of the high-manganese and high-aluminum steel standard sample is accurately measured by an ICP - AES instrument; by using a direct-reading spectrometer to excite the high-manganese and high-aluminum steel standard sample multiple times, the spectral line intensity of the Al element at different Al contents can be accurately obtained; further, an accurate working curve of the Al content can be established in the direct-reading spectrometer. The method provided by the present invention solves the problem that the direct-reading spectrometer cannot accurately measure the Al content of high-manganese and high-aluminum steel, and the measurement results have good repeatability and stability, meet the requirements of rapid analysis in the production and smelting process, greatly improve the production efficiency and the hit rate of the Al content of the finished steel, and provide a guarantee for the industrial production of high-manganese and high-aluminum steel. Specific embodiments

[0016] The present invention will be further described in detail below in conjunction with embodiments. The embodiments are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention. This embodiment provides a method for accurately detecting the Al content of high-manganese and high-aluminum steel using a direct-reading spectrometer, including the following steps: Melting industrial pure iron, molybdenum-containing raw materials, graphite, manganese-containing raw materials, and electrolytic aluminum to obtain molten steel. In the present invention, the melting preferably includes the following steps: vacuum induction melting industrial pure iron and molybdenum-containing raw materials to obtain basic molten steel; adding part of the graphite to the basic molten steel for vacuum carbon deoxidation to obtain pre-deoxidized molten steel; adding the remaining graphite, manganese-containing raw materials, and electrolytic aluminum to the pre-deoxidized molten steel in sequence for alloying to obtain molten steel.

[0017] In this embodiment, the molybdenum-containing raw material is preferably metallic molybdenum or ferromolybdenum, and the manganese-containing raw material is preferably metallic manganese or electrolytic manganese.

[0018] In this embodiment, the vacuum degree of the vacuum induction melting is preferably below 40 Pa.

[0019] In this embodiment, the process of adding part of the graphite to the basic molten steel is carried out under a protective atmosphere. The percentage of the part of the graphite in the total mass of the graphite is preferably 10-20%, the pressure of the protective atmosphere is preferably 0.05-0.1 MPa, and the protective atmosphere is preferably argon with a purity ≥ 99.999%.

[0020] In this embodiment, the vacuum carbon deoxidation process is carried out under vacuum conditions. The vacuum degree of the vacuum conditions is preferably ≤ 40 Pa, the time of the vacuum carbon deoxidation is preferably 8-12 min, and the temperature of the vacuum carbon deoxidation is preferably 1460-1480 °C. In the present invention, the vacuum carbon deoxidation can effectively reduce the oxygen content in the molten steel and helps to obtain a high-purity ingot.

[0021] In this embodiment, the time interval for adding the remaining graphite, manganese-containing raw materials, and electrolytic aluminum to the pre-deoxidized molten steel in sequence is preferably 5-8 min. In the present invention, the alloying process is preferably carried out under a protective atmosphere. The protective atmosphere is preferably argon with a purity ≥ 99.999%, and the pressure of the protective atmosphere is preferably 0.05-0.1 MPa. In the present invention, the temperature of the alloying is preferably 1470-1500 °C.

[0022] After obtaining the molten steel, the present invention casts the molten steel to obtain a high-manganese and high-aluminum steel ingot.

[0023] After obtaining the ingot, the present invention performs high-temperature homogenization treatment and high-temperature forging on the ingot in sequence to obtain a high-manganese and high-aluminum steel forging.

[0024] In this embodiment, the temperature of the high-temperature homogenization is preferably 1170~1230°C, and the heat preservation time is 6~10h. In the present invention, the starting forging temperature of the high-temperature forging is preferably 1150~1200°C, and the final forging temperature is preferably 900~950°C.

[0025] In this embodiment, the high-temperature homogenization treatment and high-temperature forging can eliminate dendritic structure, dissolve precipitated phases back, and refine grains, which helps to obtain high-homogeneity high-manganese high-aluminum steel forgings.

[0026] After obtaining the high-manganese high-aluminum steel forgings, the present invention subjects the forgings to high-temperature solution treatment and machining, and after cleaning, obtains high-manganese high-aluminum steel specimens with bright and clean surfaces.

[0027] In this embodiment, the temperature of the high-temperature solution treatment is preferably 1150~1200°C, the heat preservation time is preferably 2~4h, and the cooling method is preferably water cooling. In the present invention, the high-temperature solution treatment and water cooling can further homogenize the chemical composition of the forgings and avoid the precipitation of precipitated phases during the cooling process, which helps to obtain high-homogeneity high-manganese high-aluminum steel specimens.

[0028] In this embodiment, the process of the machining preferably includes: cutting the forgings after high-temperature solution treatment into smaller steel samples, and grinding the steel samples until the surfaces are bright and flat. The present invention has no special limitation on the cutting method of the cutting and the grinding method of the grinding. The present invention has no special limitation on the size and shape of the steel samples, as long as they can meet the size and shape requirements for direct-reading spectrometer detection.

[0029] After obtaining the high-manganese high-aluminum steel specimens, the present invention obtains steel chips from the specimens, cleans them, weighs a certain amount of steel chips into a container, adds distilled water, digestion acid, and heats to completely decompose the steel chips, and obtains a test sample solution after volume fixation.

[0030] After obtaining the test sample solution, the present invention weighs a certain amount of iron powder into a container, adds distilled water, digestion acid, and heats to completely decompose the iron powder; then adds different volumes of Al standard solution, and obtains a series of concentration standard solutions of Al after volume fixation.

[0031] After obtaining the series of concentration standard solutions of Al, use an ICP-AES instrument to measure the series of concentration standard solutions of Al, and obtain a working curve of Al content; then use an ICP-AES instrument to measure the Al content in the test sample solution, and combine with the obtained working curve to obtain the Al content of the high-manganese high-aluminum steel specimen.

[0032] In this embodiment, the digestion acid is preferably nitric acid and hydrochloric acid. In the present invention, the method for decomposing steel shavings is preferably as follows: First, add distilled water and nitric acid for heating and decomposition. After bubbling occurs, add hydrochloric acid, and then continue heating until the steel shavings are completely decomposed.

[0033] In this embodiment, the concentration interval of the series of standard solutions of Al is preferably 1-2%. In the present invention, the number of measurements of the series of standard solutions of Al using an ICP-AES instrument is preferably 3-5 times, and the average value is taken as the measurement result.

[0034] In this embodiment, the number of measurements of the Al content in the sample solution to be measured using an ICP-AES instrument is preferably 3-5 times, and the average value is taken as the measurement result.

[0035] After obtaining the Al content of the high-manganese high-aluminum steel standard sample, the present invention uses a direct-reading spectrometer to excite the high-manganese high-aluminum steel standard sample to obtain the spectral intensity of the Al element; then, based on the measured spectral intensity of Al and the measured Al content, a working curve of the Al content is established in the direct-reading spectrometer.

[0036] In this embodiment, the number of excitation times for exciting the high-manganese high-aluminum steel standard sample using a direct-reading spectrometer is preferably 3-5 times, and the average value of the spectral intensity of the Al element is taken as the measurement result.

[0037] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below in conjunction with embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0038] In the embodiment of the present invention, induction melting is carried out in a 100 kg vacuum induction furnace, and the charge amount is 80-90 kg.

[0039] In the embodiment of the present invention, the purity of high-purity argon gas in each step is ≥99.999%, the industrial pure iron contains ≥99.98 wt% iron, the metal molybdenum purity is ≥99.98 wt%, the metal manganese purity is ≥99.80 wt%, the graphite purity is ≥99.95 wt%, and the electrolytic aluminum purity is ≥99.95 wt%.

[0040] In the embodiment, the difference in the preparation process of high-manganese high-aluminum steel standard samples with different Al contents lies only in the different usage amounts of alloy materials. The target components of high-manganese high-aluminum steel standard samples with different Al contents are shown in Table 1.

[0041] Table 1 Target components of high-manganese high-aluminum steel standard samples with different Al contents / wt%

[0042] The specific steps are as follows.

[0043] According to the composition of the target steel grade, calculate the weights of the required raw materials, and prepare the smelting raw materials. The weights of the raw materials required for high-manganese and high-aluminum steels with different Al contents are shown in Table 2.

[0044] Table 2 Weights of raw materials required for high-manganese and high-aluminum steels with different Al contents / kg

[0045] Put industrial pure iron and molybdenum metal into the crucible of a vacuum induction furnace. Put 20% of the total mass of graphite, the remaining 80% of graphite, manganese metal, and electrolytic aluminum into the charging bin in sequence; start the vacuum pump, evacuate the pressure in the furnace to 30 Pa, and then close the vacuum pump; then energize to raise the temperature to melt all the smelting raw materials in the crucible to obtain basic molten steel.

[0046] Inject high-purity argon gas into the furnace to raise the pressure in the furnace to 0.08 MPa; then add 20% of the total mass of graphite to the basic molten steel. After the graphite is completely melted, start the vacuum pump and begin vacuum carbon deoxidation. The vacuum degree of vacuum carbon deoxidation is 20 Pa, the temperature is 1470 °C, and the time is 10 min to obtain pre-deoxidized molten steel.

[0047] Inject high-purity argon gas into the furnace to raise the pressure in the furnace to 0.08 MPa, and then add the remaining 80% of graphite, manganese metal, and electrolytic aluminum to the pre-deoxidized molten steel from the charging bin at 1480 °C in sequence for alloying, with a time interval of 6 min to obtain molten steel; then cast the molten steel to obtain a high-manganese and high-aluminum steel ingot.

[0048] Perform high-temperature homogenization treatment on the ingot. The high-temperature homogenization temperature is 1200 °C, and the heating time is 8 h; then perform hot forging (the starting forging temperature is 1160 °C, and the final forging temperature is 920 °C) and water-cool to room temperature to obtain a high-manganese and high-aluminum steel forging with a diameter of 60 mm.

[0049] Perform high-temperature solution treatment on the forging. The high-temperature solution temperature is 1180 °C, and the heating time is 3 h, and water-cool to room temperature; then use a wire cutting machine to cut out a 20-mm-thick round block from the forging, and then use a grinding machine to polish and flatten the surface of the round block, clean the surface of the round block with anhydrous ethanol and dry it to obtain a high-manganese and high-aluminum steel standard sample.

[0050] Drill steel chips from the standard sample with a drill press, clean the steel chips with anhydrous ethanol and dry them; then weigh 0.5 g of the steel chips and place them in a beaker, add 50 ml of distilled water and 50 ml of nitric acid and heat at low temperature. After large bubbles appear, add 50 ml of hydrochloric acid and continue heating until the steel chips are completely decomposed; then transfer them to a 250-ml volumetric flask for volume fixation to obtain a sample solution to be measured.

[0051] Weigh 8 portions of iron powder with a purity of ≥99.95 wt% and a mass of 0.45 g each, and place them in 8 beakers respectively. Use the same decomposition method to completely decompose the iron powder, and then transfer them into 8 250-ml volumetric flasks respectively. Then add different volumes of Al standard solution with a mass concentration of 0.2 mg / ml to the 8 volumetric flasks, and dilute to the mark with distilled water to prepare a series of standard solutions with Al concentrations of 1 wt%, 3 wt%, 5 wt%, 7 wt%, 9 wt%, 11 wt%, 13 wt%, and 15 wt%.

[0052] Use an ICP-AES instrument to measure the series of standard solutions with different Al concentrations to obtain the working curve of Al content; then use the ICP-AES instrument to measure the solution of the sample to be tested, and combine the obtained working curve to obtain the Al content of the high-manganese and high-aluminum steel standard sample. Table 3 shows the measurement results of the Al content of the high-manganese and high-aluminum steel standard sample. It can be seen that the measured values of the Al content of the high-aluminum and high-manganese steel standard sample are all lower than its target content, which is caused by the burning loss of Al during the melting process.

[0053] Table 3 Measurement results of Al content of high-manganese and high-aluminum steel standard sample / wt%

[0054] Use a direct-reading spectrometer to excite the high-manganese and high-aluminum steel standard sample to obtain the spectral intensity of the Al element; then establish the working curve of Al content in the direct-reading spectrometer according to the spectral intensity of Al measured by the direct-reading spectrometer and the Al content measured by the ICP-AES instrument.

[0055] In order to verify the accuracy of the working curve of Al content established in the direct-reading spectrometer in the embodiment of the present invention, high-manganese and high-aluminum steel samples with target Al contents of 3.0 wt%, 5.0 wt%, 7.0 wt%, 9.0 wt%, and 11.0 wt% were prepared according to the preparation method of the high-manganese and high-aluminum steel standard sample.

[0056] Use the direct-reading spectrometer and ICP-AES instrument that establish the working curve of Al content in the embodiment of the present invention to measure the Al content of the high-manganese and high-aluminum steel sample, and the measurement results are shown in Table 4. It can be seen that the results of the Al content measured by the method of the present invention are similar to those measured by the ICP-AES method, indicating that the detection method of the present invention has high accuracy; moreover, the relative deviation (SD) and relative standard deviation (RSD) of the results of the Al content measured by the method of the present invention are very small, indicating that the results measured by the method of the present invention are stable and the method is reliable.

[0057] Table 4 Measurement results of Al content of high-manganese and high-aluminum steel sample / wt%

[0058] Although the above embodiments have described the present invention in detail, they are only a part of the embodiments of the present invention, rather than all embodiments. People can also obtain other embodiments based on this embodiment without creative efforts, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for detecting the aluminum content of high manganese and high aluminum steel using a direct reading spectrometer, characterized in that: include, Step 1: Smelting industrial pure iron, molybdenum-containing raw materials, graphite, manganese-containing raw materials, and electrolytic aluminum to obtain molten steel and casting to obtain high manganese and high aluminum steel ingots with different Al contents; Step 2: subjecting the ingot to high temperature homogenization treatment and high temperature forging in sequence to obtain a high manganese and high aluminum steel forging; Step 3, subjecting the forging to high temperature solution treatment and mechanical processing in sequence, and obtaining a high manganese and high aluminum steel standard sample after cleaning; Step 4, obtaining steel scraps from the high manganese and high aluminum steel standard sample and cleaning them, weighing a certain amount of steel scraps into a container, adding distilled water and digestion acid and heating to completely decompose the steel scraps, and obtaining a sample solution to be tested after constant volume; Step 5, weigh a certain amount of iron powder into a container, add distilled water and digestion acid and heat to completely decompose the iron powder; then add different volumes of Al standard solution, and obtain a series of Al concentration standard solutions after constant volume; Step 6: Using an ICP-AES instrument to measure the Al concentration series standard solutions to obtain a working curve of Al content; Step 7: using an ICP-AES instrument to measure the Al content in the sample solution to be tested, and combining the obtained working curve to obtain the Al content of the high manganese and high aluminum steel standard sample; Step 8: Excite the high manganese and high aluminum steel standard sample using a direct reading spectrometer to obtain the spectral line intensity of the Al element; Step nine: according to the measured Al content and the Al spectral line intensity, a working curve of Al content is established in the direct reading spectrometer, and then the direct reading spectrometer is used to detect the aluminum content of the high manganese and high aluminum steel according to the aforementioned working curve.

2. The method for detecting the aluminum content of high manganese and high aluminum steel using a direct reading spectrometer according to claim 1, characterized in that: Step 1: vacuum induction melting industrial pure iron and molybdenum-containing raw materials with a vacuum degree of ≤40Pa to obtain basic molten steel; adding part of graphite to the basic molten steel for vacuum carbon deoxidation with a vacuum degree of ≤40Pa for 8 to 12 minutes to obtain pre-deoxidized molten steel; adding the remaining graphite, manganese-containing raw materials and electrolytic aluminum to the pre-deoxidized molten steel in sequence for alloying to obtain molten steel.

3. The method for detecting the aluminum content of high manganese and high aluminum steel using a direct reading spectrometer according to claim 1, characterized in that: Step 2: The temperature of the high temperature homogenization treatment is 1170~1230℃, and the insulation time is 6~10h.

4. The method for detecting the aluminum content of high manganese and high aluminum steel using a direct reading spectrometer according to claim 1, characterized in that: Step 3: The temperature of the high temperature solution treatment is 1150-1200°C, the holding time is 2-4 hours, and the cooling method is water cooling.

5. The method for detecting the aluminum content of high manganese and high aluminum steel using a direct reading spectrometer according to claim 1, characterized in that: The digestion acid is nitric acid and hydrochloric acid; the decomposition method is to first add distilled water and nitric acid to heat and decompose, add hydrochloric acid after bubbling, and then continue heating until the sample is completely decomposed.

6. The method for detecting the aluminum content of high manganese and high aluminum steel using a direct reading spectrometer according to claim 1, characterized in that: The concentration interval of the series of Al concentration standard solutions is preferably 1-2%.

Images