Method for determining tungsten, titanium, vanadium, molybdenum, aluminum, cobalt and nickel elements in high-speed steel

Abstract

The invention discloses a method for determining tungsten, titanium, vanadium, molybdenum, aluminum, cobalt and nickel elements in high-speed steel, which comprises the following steps: weighing a sample in a polytetrafluoroethylene beaker, adding aqua regia and hydrofluoric acid, and dissolving in a low-temperature electric hot plate; preparing a blank sample; transferring the cooled sample solution into a polytetrafluoroethylene volumetric flask, and diluting to a scale; preparing a standard correction curve solution; selecting a spectral line; drawing a calibration curve; introducing the sample solution and the blank sample solution into an inductively coupled plasma emission spectrometer, measuring the signal intensity of each ion, and calculating the content of each element in the sample solution according to a standard solution calibration curve with known mass percent. According to the present invention, the modern analysis technology, the dilute aqua regia and the hydrofluoric acid are combined to dissolve the sample, the hydrofluoric acid and the tungsten are utilized to generate the complex so as to avoid the hydrolysis of the tungsten, and the characteristics of wide linear range and high accuracy of the ICP-OES are utilized, and the analysis sensitivity and the analysis accuracy are improved by using the polyethylene sample introduction system;

Description

Technical Field

[0001] The present invention belongs to the technical field of iron and steel metallurgical analysis, and particularly relates to a method for determining the elements of tungsten, titanium, vanadium, molybdenum, aluminum, cobalt, and nickel in high-speed steel. Background Art

[0002] High-speed steel is a tool steel with high hardness, high wear resistance, and high heat resistance. The main alloying elements are tungsten, molybdenum, chromium, and vanadium. Some high-speed tool steels also contain elements such as cobalt and aluminum. The levels of these alloying elements directly affect the wear resistance, corrosion resistance, toughness, and hardness of high-speed steel. Therefore, accurately determining the contents of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel in high-speed steel is very important for the metallurgical industry.

[0003] So far, there are no national standards or enterprise standards for detecting tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel in high-speed steel. Through literature retrieval, Miao Jinzhang studied "Continuous systematic determination of five elements of tungsten, manganese, chromium, vanadium, and molybdenum in high-speed steel". After decomposing the sample, tungsten is fully precipitated in the form of tungstic acid. After the precipitate is filtered and separated, a part of the filtrate is used to determine manganese, chromium, and vanadium by the ferrous sulfate volumetric method, and a part of the filtrate is used to determine molybdenum by the thiocyanate colorimetric method. After dissolving the tungstic acid precipitate with sodium hydroxide, the content of tungsten is determined by acid-base titration. This method has a large workload, requires a lot of drugs, and cannot simultaneously determine multiple elements, and requires multiple sample dissolutions and multiple tests. Bian Dongmei discussed "Determination of vanadium in high-speed steel". This method uses the redox volumetric method to determine vanadium. Hu Yumei, Liu Yi, and Shi Xiaofang studied "Method for simultaneous determination of multiple elements such as chromium, molybdenum, vanadium, tungsten, and cobalt in high-speed steel". This method requires the use of a large amount of phosphoric acid, boric acid, and perchloric acid, with cumbersome operations and low result accuracy. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for determining the elements of tungsten, titanium, vanadium, molybdenum, aluminum, cobalt, and nickel in high-speed steel. The present invention combines modern analysis techniques, dissolves the sample with dilute aqua regia and hydrofluoric acid, and utilizes the formation of a complex between hydrofluoric acid and tungsten to avoid the hydrolysis of tungsten. Taking advantage of the wide linear range and high accuracy of ICP-OES, a polyethylene sampling system is used to improve the sensitivity and accuracy of analysis.

[0005] The present invention provides an ICP-OES for determining tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel in high-speed steel, which has high sensitivity, fast determination speed, simple operation, less interference compared to other methods, and good selectivity; a polyethylene sampling device and nebulizer are used to improve the determination stability and can provide accurate data for the control process of smelting components.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for determining the elements of tungsten, titanium, vanadium, molybdenum, aluminum, cobalt, and nickel in high-speed steel, comprising the following steps:

[0008] Step 1: Weigh the sample into a polytetrafluoroethylene beaker, add aqua regia and hydrofluoric acid, dissolve it on a low-temperature electric hot plate, remove it, and cool it to room temperature; make a blank sample concomitantly;

[0009] Step 2: Transfer the above sample solution after cooling into a polytetrafluoroethylene volumetric flask, dilute it to the mark with high-purity water, and shake well; wait for machine analysis;

[0010] Step 3: Preparation of the standard calibration curve solution

[0011] Single-element standard solutions of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel: with a concentration of 1000 μg / mL, sourced from the National Standard Substances Center;

[0012] Weigh a certain amount of high-purity iron in several portions into a polytetrafluoroethylene beaker, add aqua regia and hydrofluoric acid, dissolve it on a low-temperature electric hot plate, remove it, and cool it to room temperature. Transfer it into a polytetrafluoroethylene volumetric flask, and add single-element standard solutions of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel respectively to prepare solutions containing Co, Al, Mo, Cr, Ni 0, 0.020%, 0.100%, 0.500%, 1.00%, 5.00%; W, V 0, 0.050%, 0.500%, 2.00%, 5.00%, 10.00%. Transfer the sample solution into a 100 mL polytetrafluoroethylene volumetric flask, dilute it to the mark with high-purity water, and shake well; this solution is used to make the standard curve;

[0013] Step 4: Select spectral lines

[0014] The preferred measuring instrument is Optima 5300DV; the observation mode is vertical observation for W, V, Co, Al, Cr, Ni, and horizontal observation for Mo;

[0015] Determine the analytical lines as W207.912nm, V311.071nm, Co228.616nm, Al396.153nm, Mo202.031nm, Cr267.716nm, Ni231.604nm;

[0016] Step 5: Plot the calibration curve: Introduce the standard calibration curve solution into an inductively coupled plasma emission spectrometer, measure the signal intensities of Co, Al, Mo, Cr, Ni, W, and V ions, and plot the calibration curve with the mass percentage of the element as the abscissa and the emission intensity of the element as the ordinate;

[0017] Step 6: Introduce the sample solution and the blank sample solution into an inductively coupled plasma optical emission spectrometer to measure the signal intensities of Co, Al, Mo, Cr, Ni, W, and V ions. According to the calibration curve of the standard solution with known mass percentages, determine the contents of Co, Al, Mo, Cr, Ni, W, and V in the sample solution;

[0018] The contents of Co, Al, Mo, Cr, Ni, W, and V elements in the sample are calculated according to the following formula:

[0019] W% = W i - W0

[0020] In the formula: W - mass percentage of the element in the sample;

[0021] W0 - mass percentage of the element in the blank solution to be measured;

[0022] W i - mass percentage of the element in the sample to be measured.

[0023] Furthermore, it specifically includes the following steps:

[0024] Step 1: Weigh 0.2000 g of the sample into a polytetrafluoroethylene beaker, add 15 mL of (1+1) aqua regia and 5 mL of hydrofluoric acid, dissolve it on a low-temperature hot plate, remove it, and cool it to room temperature; prepare a blank sample accordingly;

[0025] Step 2: Transfer the above-mentioned cooled sample solution to a 100-mL polytetrafluoroethylene volumetric flask, dilute it to the mark with high-purity water, and shake well; wait for analysis on the instrument;

[0026] Step 3: Preparation of the standard calibration curve solution

[0027] Single-element standard solutions of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel: with a concentration of 1000 μg / mL, sourced from the National Standard Material Center;

[0028] Weigh 0.2 g of high-purity iron in six portions into polytetrafluoroethylene beakers, add 15 mL of aqua regia and 5 mL of hydrofluoric acid, dissolve it on a low-temperature hot plate, remove it, and cool it to room temperature. Transfer it to 100-mL polytetrafluoroethylene volumetric flasks, and add single-element standard solutions of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel respectively to prepare solutions containing Co, Al, Mo, Cr, Ni 0, 0.020%, 0.100%, 0.500%, 1.00%, 5.00%; W, V 0, 0.050%, 0.500%, 2.00%, 5.00%, 10.00%. Transfer the sample solution to a 100-mL polytetrafluoroethylene volumetric flask, dilute it to the mark with high-purity water, and shake well; this solution is used to make the standard curve;

[0029] Step 4: Select spectral lines

[0030] Preferably, the measuring instrument is Optima 5300DV; the observation modes are vertical observation for W, V, Co, Al, Cr, and Ni, and horizontal observation for Mo;

[0031] Determine the analytical lines as W 207.912 nm, V 311.071 nm, Co 228.616 nm, Al 396.153 nm, Mo 202.031 nm, Cr 267.716 nm, and Ni 231.604 nm;

[0032] Step 5: Plot the calibration curve: Introduce the standard calibration curve solution into the inductively coupled plasma emission spectrometer, measure the signal intensities of Co, Al, Mo, Cr, Ni, W, and V ions, and plot the calibration curve with the mass percentage of the element as the abscissa and the emission intensity of the element as the ordinate;

[0033] Step 6: Introduce the sample solution and the blank sample solution into the inductively coupled plasma emission spectrometer, measure the signal intensities of Co, Al, Mo, Cr, Ni, W, and V ions, and calculate the contents of Co, Al, Mo, Cr, Ni, W, and V in the sample solution according to the calibration curve of the standard solution with known mass percentage;

[0034] The contents of Co, Al, Mo, Cr, Ni, W, and V elements in the sample are calculated according to the following formula:

[0035] W% = W i - W0

[0036] Where: W - the mass percentage content of the element in the sample;

[0037] W0 - the mass percentage of the element in the blank solution to be measured;

[0038] W i - the mass percentage of the element in the sample to be measured.

[0039] Furthermore, the detection range of this method is: Co, Al, Mo, Cr, Ni 0.010 - 5.00%; W, V 0.020 - 10.00%.

[0040] Furthermore, this method is simple to operate and has a short process, and can complete the determination of Co, Al, Mo, Cr, Ni, W, and V seven elements in the sample within 1 hour.

[0041] Furthermore, this method uses hydrofluoric acid to form a complex with tungsten, avoiding the hydrolysis of tungsten and improving the accuracy of detection.

[0042] Furthermore, a method for the rapid determination of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel in high-speed steel by ICP-OES was established, filling the gap in the method for simultaneously detecting tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel in high-speed steel.

[0043] Furthermore, this method has the characteristics of a wide linear range, high sensitivity, simple operation, fast analysis speed, and accurate and reliable analysis results.

[0044] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0045] 1. The present invention uses fewer chemical reagents, only 7.5 mL of aqua regia and 5 mL of hydrofluoric acid, which is more material-saving and reduces the waste discharge of chemical reagents.

[0046] 2. The operation of the present invention is simple and the process is short. The determination of seven elements, namely Co, Al, Mo, Cr, Ni, W, and V, in the sample can be completed within 1 hour.

[0047] 3. The present invention forms a complex with tungsten using hydrofluoric acid, avoiding the hydrolysis of tungsten and improving the accuracy of detection.

[0048] 4. During the ICP-OES analysis process, the use of a polyethylene nebulizer can resist the erosion of most chemical reagents, ensuring the purity of the sample and the accuracy of the analysis results.

[0049] 5. A method for the rapid determination of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel in high-speed steel by ICP-OES was established, filling the gap in the method for simultaneously detecting tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel in high-speed steel.

[0050] 6. The determinations are carried out by using the vertical observation method for W, V, Co, Al, Cr, and Ni respectively, and the horizontal observation method for Mo. The detection ranges are Co, Al, Mo, Cr, Ni 0.010 - 5.00%; W, V 0.020 - 10.00%. Through multiple inspections of high-speed steel samples, the application effect of the present invention is good. The present invention has the characteristics of a wide linear range, high sensitivity, simple operation, fast analysis speed, and accurate and reliable analysis results, providing reliable data for the detection of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel in high-speed steel. This method can be promoted in the metallurgical industry. Specific Embodiments

[0051] In the embodiments of the present invention, the preferred reagents used are as follows:

[0052] Hydrochloric acid, nitric acid, hydrofluoric acid: of superior grade purity;

[0053] Single-element standard solutions of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel: with a concentration of 1000 μg / mL, sourced from the National Standard Substances Center.

[0054] 100 mL Teflon volumetric flask; argon gas: argon purity ≥ 99.9%; compressed air.

[0055] Preferably, the model of the inductively coupled plasma emission spectrometer is Optima 5300DV of PE Company. The preferred instrument is Optima 5300DV (PE Company, USA); the observation modes are vertical observation for W, V, Co, Al, Cr, Ni, and horizontal observation for Mo.

[0056] Determine the analysis lines as W 207.912 nm, V 311.071 nm, Co 228.616 nm, Al 396.153 nm, Mo 202.031 nm, Cr 267.716 nm, Ni 231.604 nm.

[0057] 1. Sample analysis

[0058] Decompose the sample

[0059] Weigh 0.2000 g of the sample into a Teflon beaker, add 15 mL of (1+1) aqua regia and 5 mL of hydrofluoric acid, dissolve it on a low-temperature hot plate, remove it, and cool it to room temperature. Make a blank sample accordingly. Transfer the cooled sample solution to a 100 mL Teflon volumetric flask, dilute it to the mark with high-purity water, and shake well. Wait for analysis on the instrument.

[0060] Preparation of the standard calibration curve solution

[0061] Weigh 6 portions of 0.2 g of high-purity iron into Teflon beakers respectively, add 15 mL of (1+1) aqua regia and 5 mL of hydrofluoric acid, dissolve it on a low-temperature hot plate, remove it, and cool it to room temperature. Transfer it to 100 mL Teflon volumetric flasks, and add single-element standard solutions of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel respectively to prepare solutions containing Co, Al, Mo, Cr, Ni 0, 0.020%, 0.100%, 0.500%, 1.00%, 5.00%; W, V 0, 0.050%, 0.500%, 2.00%, 5.00%, 10.00%. Transfer the sample solution to a 100 mL Teflon volumetric flask, dilute it to the mark with high-purity water, and shake well. This solution is used to make the standard curve.

[0062] Draw the calibration curve:

[0063] Introduce the standard calibration curve solution into the inductively coupled plasma emission spectrometer, measure the signal intensities of Co, Al, Mo, Cr, Ni, W, and V ions, and draw the calibration curve with the mass percentage of the element as the abscissa and the emission intensity of the element as the ordinate.

[0064] Determination:

[0065] The sample solution and the blank sample solution are introduced into an inductively coupled plasma optical emission spectrometer to measure the signal intensities of Co, Al, Mo, Cr, Ni, W, and V ions. According to the calibration curve of the standard solution with known mass percentages, the contents of Co, Al, Mo, Cr, Ni, W, and V in the sample solution are determined.

[0066] The contents of Co, Al, Mo, Cr, Ni, W, and V elements in the sample are calculated according to the following formula:

[0067] W% = W i - W0

[0068] In the formula: W - mass percentage of the element in the sample;

[0069] W0 - mass percentage of the element in the blank solution to be measured;

[0070] W i - mass percentage of the element in the sample to be measured;

[0071] The detection range of this method: Co, Al, Mo, Cr, Ni 0.010 - 5.00%; W, V 0.020 - 10.00%.

[0072] Example 1. Method detection limit

[0073] The working curve is made according to the above method. The curve correlation coefficients r of Co, Al, Mo, Cr, Ni, W, and V are all greater than 0.9991. 11 blank solutions are prepared according to the experimental method and measured in 3 times. According to the detection limit formula C L = 3S b / k (S b is the standard deviation of the blank, and k is the slope of the corresponding calibration curve), the detection limits of Co, Al, Mo, Cr, Ni, W, and V are calculated to be 0.003 μg / mL, 0.002 μg / mL, 0.007 μg / mL, 0.003 μg / mL, 0.003 μg / mL, 0.007 μg / mL, and 0.004 μg / mL respectively.

[0074] Example 2. Method accuracy test

[0075] (1) To evaluate the accuracy of the method, a high-speed steel standard sample was measured. And a spike recovery test was carried out on the high-speed steel sample and the standard sample.

[0076] Table 1 Accuracy test

[0077]

[0078] (2) Spike recovery tests were carried out on high-speed steel samples 1# and 2# and standard samples.

[0079] Table 2 Spike recovery rate

[0080]

[0081] Example 3. Method precision

[0082] Under the selected experimental method, weigh high-speed steel sample 3 # , 4 # . Prepare 11 sample solutions in parallel for each, and conduct precision investigation. Calculate the standard deviation (SD) and relative standard deviation (RSD) of the determination results of each component, as shown in Table 3.

[0083] Table 3

[0084]

[0085]

[0086] Therefore, through the verification of the above-mentioned embodiments, it can be seen that for the determination of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel in high-speed steel using ICP-OES described in the present invention, the detection ranges are Co, Al, Mo, Cr, Ni 0.010 - 5.00%; W, V 0.020 - 10.00%. Through multiple inspections of high-speed steel samples, the present invention has good application effects. The present invention has the characteristics of a wide linear range, high sensitivity, simple operation, fast analysis speed, accurate and reliable analysis results, and provides reliable data for the detection of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel in high-speed steel.

[0087] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for determining tungsten, titanium, vanadium, molybdenum, aluminum, cobalt and nickel in high-speed steel, characterized in that: The steps include: Step 1: Weigh the sample into a polytetrafluoroethylene beaker, add aqua regia and hydrofluoric acid to dissolve on a low-temperature electric hot plate, remove and cool to room temperature; prepare a blank sample at the same time; Step 2: Transfer the cooled sample solution to a polytetrafluoroethylene volumetric flask, dilute to the mark with high-purity water, and shake well; wait for loading; Step 3: Preparation of standard calibration curve solutions Single element standard solutions of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium and nickel: concentration is 1000 μg / mL, from the National Center for Standard Materials; Weigh a certain amount of high-purity iron in a polytetrafluoroethylene beaker, add aqua regia and hydrofluoric acid to dissolve on a low-temperature electric hot plate, remove, cool to room temperature, transfer to a polytetrafluoroethylene volumetric flask, add tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel single element standard solutions, respectively, to prepare solutions containing Co, Al, Mo, Cr, Ni0, 0.020%, 0.100%, 0.500%, 1.00%, 5.00%; W, V0, 0.050%, 0.500%, 2.00%, 5.00%, 10.00%, transfer the sample solution to a 100mL polytetrafluoroethylene volumetric flask, dilute to the scale with high-purity water, and shake well; This solution is used to prepare the standard curve; Step 4: Select the spectrum line The preferred measuring instrument is Optima 5300DV; the observation method is vertical observation for W, V, Co, Al, Cr, Ni, and horizontal observation for Mo; Determine W207.912nm, V311.071nm, Co228.616nm, Al396.153nm, Mo202.031nm, Cr267.716nm, Ni231.604nm as analysis lines; Step 5: Draw a calibration curve: introduce the standard calibration curve solution into the inductively coupled plasma emission spectrometer, measure the signal intensity of Co, Al, Mo, Cr, Ni, W, and V ions, and draw a calibration curve with the mass percentage of the element as the abscissa and the emission intensity of the element as the ordinate; Step 6: The sample solution and the blank sample solution are introduced into an inductively coupled plasma emission spectrometer to measure the signal intensity of Co, Al, Mo, Cr, Ni, W, and V ions, and the content of Co, Al, Mo, Cr, Ni, W, and V in the sample solution is calculated based on the calibration curve of the standard solution with known mass percentage; The contents of Co, Al, Mo, Cr, Ni, W and V in the sample are calculated as follows: W%=W i -W0 Where: W-mass percentage of the element in the sample; W0-mass percentage of the element in the blank solution to be tested; W i -The mass percentage of the element in the sample to be measured.

2. The method for determining the content of tungsten, titanium, vanadium, molybdenum, aluminum, cobalt and nickel in high-speed steel according to claim 1, characterized in that: The specific steps include: Step 1: Weigh 0.2000g of sample into a polytetrafluoroethylene beaker, add 15mL (1+1) aqua regia and 5mL hydrofluoric acid to dissolve on a low-temperature electric hot plate, remove and cool to room temperature; prepare a blank sample at the same time; Step 2: Transfer the cooled sample solution to a 100 mL polytetrafluoroethylene volumetric flask, dilute to the mark with high-purity water, and shake well; wait for loading; Step 3: Preparation of standard calibration curve solutions Single element standard solutions of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium and nickel: concentration is 1000 μg / mL, from the National Center for Standard Materials; Weigh 6 portions of 0.2g high-purity iron in a polytetrafluoroethylene beaker, add 15mL of aqua regia and 5mL of hydrofluoric acid to dissolve on a low-temperature electric hot plate, remove, cool to room temperature, transfer to a 100mL polytetrafluoroethylene volumetric flask, add tungsten, vanadium, molybdenum, aluminum, cobalt, chromium, and nickel single element standard solutions, respectively, to prepare solutions containing Co, Al, Mo, Cr, Ni0, 0.020%, 0.100%, 0.500%, 1.00%, 5.00%; W, V0, 0.050%, 0.500%, 2.00%, 5.00%, 10.00%, transfer the sample solution to a 100mL polytetrafluoroethylene volumetric flask, dilute to the mark with high-purity water, and shake well; This solution is used to prepare the standard curve; Step 4: Select the spectrum line The preferred measuring instrument is Optima 5300DV; the observation method is vertical observation for W, V, Co, Al, Cr, Ni, and horizontal observation for Mo; Determine W207.912nm, V311.071nm, Co228.616nm, Al396.153nm, Mo202.031nm, Cr267.716nm, Ni231.604nm as analysis lines; Step 5: Draw a calibration curve: introduce the standard calibration curve solution into the inductively coupled plasma emission spectrometer, measure the signal intensity of Co, Al, Mo, Cr, Ni, W, and V ions, and draw a calibration curve with the mass percentage of the element as the abscissa and the emission intensity of the element as the ordinate; Step 6: The sample solution and the blank sample solution are introduced into an inductively coupled plasma emission spectrometer to measure the signal intensity of Co, Al, Mo, Cr, Ni, W, and V ions, and the content of Co, Al, Mo, Cr, Ni, W, and V in the sample solution is calculated based on the calibration curve of the standard solution with known mass percentage; The contents of Co, Al, Mo, Cr, Ni, W and V in the sample are calculated as follows: W%=W i -W0 Where: W-mass percentage of the element in the sample; W0-mass percentage of the element in the blank solution to be tested; W i -The mass percentage of the element in the sample to be measured.

3. The method for determining tungsten, titanium, vanadium, molybdenum, aluminum, cobalt and nickel in high-speed steel according to claim 1 or 2, characterized in that: The detection range of this method is: Co, Al, Mo, Cr, Ni 0.010~5.00%; W, V 0.020~10.00%.

4. The method for determining the content of tungsten, titanium, vanadium, molybdenum, aluminum, cobalt and nickel in high-speed steel according to claim 1, characterized in that: The method is simple to operate and has a short process, and the determination of seven elements, Co, Al, Mo, Cr, Ni, W, and V in the sample can be completed within 1 hour.

5. The method for determining tungsten, titanium, vanadium, molybdenum, aluminum, cobalt and nickel in high speed steel according to claim 1, characterized in that: The method uses hydrofluoric acid to form a complex with tungsten, thereby avoiding the hydrolysis of tungsten and improving the accuracy of detection.

6. The method for determining tungsten, titanium, vanadium, molybdenum, aluminum, cobalt and nickel in high-speed steel according to claim 1, characterized in that: A method for rapid determination of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium and nickel in high-speed steel by ICP-OES was established, filling the gap in the method for simultaneous detection of tungsten, vanadium, molybdenum, aluminum, cobalt, chromium and nickel in high-speed steel.

7. The method for determining the content of tungsten, titanium, vanadium, molybdenum, aluminum, cobalt and nickel in high-speed steel according to claim 1, characterized in that: The method has the characteristics of wide linear range, high sensitivity, simple operation, fast analysis speed, and accurate and reliable analysis results.

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