This standard specifies the method for determining the contents of carbon, silicon, manganese, phosphorus, sulphur, chromium, nickel, tungsten, molybdenum, vanadium, aluminum, titanium, copper, niobium, cobalt, boron, zirconium, arsenic and tin in carbon and low-alloy steel with the spark discharge atomic emission spectrometric method (routine method).
This standard is applicable to the analysis of as-cast or forged carbon and low-alloy steel samples such as electric furnace, induction furnace, electroslag furnace and converter. See Table 1 for the determination scope of each element.
Table 1 Determination Scope of Each Element
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2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) applies.
GB/T 6379.1 Accuracy (Trueness and Precision) of Measurement Methods and Results - Part 1: General Principles and Definitions
GB/T 6379.2 Accuracy (Trueness and Precision) of Measurement Methods and Results - Part 2: Basic Method for the Determination of Repeatability and Reproducibility of a Standard Measurement Method
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the Determination of Chemical Composition
3 Principle
Make the well-prepared block sample discharge with the counter electrode under the action of spark light source to generate plasma in inert atmosphere at high temperature. Where the measured element is excitated, the electron will transit in the atom between different energy levels; the characteristic spectral line will be generated when transiting from high energy level to low energy level; then measure the spectral intensity of characteristic spectral line of the selected analytical element and the internal standard element. Calculate the content of the measured element through calibration curve according to the relation between the spectral line intensity (or intensity ratio) and the concentration of the measured element in sample.
