Production method of high-homogeneity chromium-nickel austenite stainless steel optical spectrum calibration example

Abstract

The present invention discloses a method for preparing the high-homogeneity chromium-nickel austenite stainless steel optical spectrum correcting sample in order to provide a reliable optical spectrum correcting sample. The method comprises the following steps: 1) correcting the component of the sample to the following mass percentage: C<=0.20, Si<=1.0, Mn<=2.0, P<=0.035, S<=0.030, Cr 16-24, Ni 6-14, and the rest is Fe; 2) smelting and casting to steel ingot with the components; 3) smithing with the staring temperature: 1100 DEG C-1150 DEG C, and the finishing temperature: 900 DEG C-950 DEG C; 4) roller milling with staring temperature: 1100 DEG C-1150 DEG C, and the finishing temperature: 900 DEG C-950 DEG C; and 5) heat treating for solution temperature 1000 DEG C-1050 DEG C and temperature preserving time 40-50min, and at last water cooling with immersion type. The invention corrects the homogeneous austenite structure with grain fineness number larger than 7 and residual ferrite dispersed arranged in the sample block, satisfies the request of the spectrum analysis and leads to that the spectrometry obtains the best analyzing precision.

Description

technical field [0001] The invention relates to the technical field of component control and analysis in the steelmaking process, in particular to the component control and analysis technology in the chromium-nickel austenitic stainless steel process. Background technique [0002] Austenitic stainless steel is the most important steel in stainless steel, and its production and usage account for about 70% of the total output and usage of stainless steel. According to the alloying method adopted to maintain the alloy austenite matrix, austenitic stainless steel can be divided into two series: chromium-nickel stainless steel and chromium-manganese stainless steel. Among them, the main chemical composition range of commonly used chromium-nickel austenitic stainless steel is shown in Table 1: [0003] Table 1 Commonly used chromium-nickel austenitic stainless steel chemical composition range, wt% [0004] the element C Si mn P S Cr N...

AI Technical Summary

Problems solved by technology

However, it is not suitable for large-scale fully automatic laboratories. The main disadvantages are: single-piece production, irregular size, heavy workload of setting value, uncertain value error and does not meet the laboratory certification specifications

[0012] 2. Forged chromium-nickel austenitic stainless steel spectral correction samples have not been widely used, and users do not have a deep understanding of this inhomogeneity phenomenon

2) The distribution of possible ferrite is uneven

[0032] 1) Forging, for the purpose of forming and densifying the sample block, applies the process of industrial mass production without purposeful optimization: the conventional forging temperature is 1150 ℃ ~ 1260 ℃, the final forging temperature is about 800 ℃, the final standard sample There is no technical requirement for the grain size and uniformity of the block;

[0033] 2) Rolling, without special requirements, for the purpose of further forming and densifying the sample block, the process of industrial mass production is applied, without purposeful optimization: the conventional opening forging temperature is 1150 ° C ~ 1260 ° C, and the final forging temperature is 800 ° C about

[0034] 3) Solid solution treatment, without this process link or the goal is not clear, the process is unreasonable

[0035] Due to the unreasonable process of the above forging and rolling stages, the coarse and uneven grains cannot be improved by heat treatment, which is determined by the characteristics of chromium-nickel austenitic stainless steel

As a result, the grain size of the sample block ranges from 5.0 to 8.5, and the ferrite is locally accumulated and distributed unevenly

For spectrometer analysis, manifested as poor uniformity

Images