CS196485B1 - Ferrous alloy for quantometer adjusting - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to a cast iron alloy for the adjustment of quantometers when performing an analysis of the shallow composition of materials in cast iron foundries.

Determination of chemical composition of technical metals in metallurgy and mechanical engineering is mostly performed by automatic analyzers - quantometers. The chemical composition is determined from the ratio of the signal of the analyzed element and the signal of the matrix element. To ensure reliable operation of the quantometers Two conditions of accuracy and stability must be met. While appropriately selected reference materials ensure accuracy, so-called adjustment samples are required to ensure stability. A necessary requirement for these samples is that the concentrations of the individual elements are close to the game boundary of the range of all the materials analyzed for one program, and that these samples are as homogeneous as possible. A great advantage is that the number of these adjustment samples is as small as possible, preferably only one.

For quantitative analysis of cast iron, it has been very difficult to meet these conditions. At the same time, the high contents of all graphitizing elements, such as carbon, silicon, phosphorus and the like, did not give rise to the fine white structure required for signal reproducibility. The use of any addition of conventional carbide-forming elements has been ruled out since these are also analyzed.

196 485

198 4BS

So far, various adjusting samples have been used to adjust the quantometers, the most common of which are the composition of:

Sample 1 element carbon manganese silicon phosphorus sulfur me3 nickel chromium molybdenum iron

Sample 2 element carbon manganese silicon phosphorus sulfur me5 nickel chromium molybdenum titanium vanan tin arsenic iron% by weight

2.8 0.9 2.0 0.6 0.05 0.5

1.9

2.3 0.8 88.15% w / w

3,3 0,4

1.9 0.16 0.08 0.16 0.27 0.2 \

0.23

0.1

0.2

0.1

0.06

92.81

The above drawbacks are overcome by an iron alloy for adjusting the quantometers according to the invention containing 3-4% by weight of carbon, 0.6-2% by weight of manganese,

1.5 to 3% by weight of silicon, 0.1 to 0.9% by weight of phosphorous, 0.3 to 1.5% by weight of amazon, 0.2 to 1.5% by weight of nickel, 0.1 to 1.3% by weight % by weight of molybdenum, further comprising 4 to 15% by weight of niobium and the remainder iron;

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Niobium in the iron alloy suppresses slightly graphitization and allows the formation of a fine white sample structure. The niobium content of the alloy decreases the iron content, thereby increasing the signal, without actually increasing the content of the element analyzed. Niobium is practically the only one of the usual metallurgical elements that ae does not use cast iron at all, therefore its concentration can be chosen arbitrarily.

As an example of a specific embodiment, the alloy is cast on a massive copper copper ingot mold with a composition in% by weight

Sample 1 Sample 2

element % by weight % by weight carbon 3.1 3.0 manganese 13 1, * silicon 3.4 2.2 nickel 1.0 1.5 chrome 0.9 0.5 molybdenum 1.1 1.0 phosphorus 0.2 0.2 niob 6.0 14.0 iron 82.9 76.4

The samples obtained give a sufficiently high and reproducible signal on the quantometer to adjust the calibration curves.

The use of the invention is particularly suitable for laboratories carrying out analyzes of the chemical composition of materials in cast iron foundries on optical emission spectroscopic analyzers, shortly called quantometreoh.

Claims (1)

Iron alloy adjustment of quantometers containing 3 to 4% by weight carbon, 0.6 to 2% by weight manganese, 1.5 to 3% by weight silicon, 0.1 to 0.9% by weight phosphorus, 0.3 to 1.5% by weight 0.2 to 1.5% by weight of nickel, 0.1 to 1.3% by weight of molybdenum, characterized in that it further comprises 4 to 15% by weight of niobium and the remainder iron.