CS268331B1 - Iron alloy for quantometer adjustment - Google Patents

Abstract

The solution concerns an iron alloy for calibrating spectrometers in the analysis of ductile and vermicular cast iron. High homogeneity and fine, graphite-free structure, guaranteeing high reproducibility of the spectrometric signal, are achieved by adding 1 to 4 wt. % niobium, 0.1 to 0.3 wt. % vanadium and 0.01 to 0.12 wt. % magnesium. It may also contain 0.01 to 0.08 wt. % cerium. The basic composition is 3 to 4 wt. % carbon, 0.2 to 1.6 wt. % manganese, 1.5 to 3 wt. % silicon, 0.5 to 2 wt. % nickel and 0.2 to 1 wt. % molybdenum.

Description

(57) The solution relates to an iron alloy for the calibration of spectrometers in the analysis of ductile and vermicular iron. High homogeneity and fine graphite-free structure, guaranteeing high reproducibility of the spectrometric signal, is achieved by adding 1 to 4 Ί masses. % niobium, 0.1 to 0.3 wt. % vanadium and 0.01 to 0.12 wt. magnesium. It may further comprise from 0.01 to 0.08% by weight. cerium. The basic composition is 3 to 4 wt. 0.2 to 1.6 wt. of manganese, 1.5 to 3 ΐ wt. % of silicon, 0.5 to 2% of nickel and 0.2 to 1% by weight of silicon; molybdenum.

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The present invention relates to an iron alloy for adjusting quantometers. The alloy is intended for controlling the smelting process of ductile and vermicular cast iron in cast iron foundries while performing spectometric analysis of the chemical composition of these cast iron.

Determination of the chemical composition of melt samples of ductile and vermicular cast iron is a source of crucial information for controlling the smelting process of cast iron, in particular the content of magnesium and cerium significantly affects the quality of the resulting casting. Almost exclusively automatic spectrometers are used for the required chemical composition time, that is approximately 3 minutes, which work mainly on the principle of atomic emission spectrometry with spark excitation. Other automatic spectrometers operate on the principle of X-ray fluorescence spectrometry. These automatic spectrometers operate continuously and so-called adjusting samples are necessary to maintain their results in a state of statistical control. The material of these adjustment samples must be characterized by high homogeneity, which is a necessary condition for good repeatability of the spectroanalytic signal. Furthermore, the material of these samples must contain as much of the analyzed elements as possible to ensure adjustment or recalibration with a minimum number of adjustment samples. Presently, adjustment samples are used with a limited number of elements at the upper limit of their normal and typical contents, so two to three adjustment samples must be used simultaneously for adjustment. Adjustment samples according to MS. No. 196485 were made of an iron alloy containing 3 to 4 wt. % of carbon, 0.6 to 2 wt. % manganese, 1.5 to 3 wt. % silicon, 0.1 to 0.9 wt. % phosphorus, 0.3 to 1.5 wt. 0.2 to 1.5 wt. % nickel, 0.1 to 1.3 wt. % molybdenum, and from 4 to 15 wt. niobium, the remainder being iron. This alloy only solved the problem for cast iron without magnesium and cerium, ie gray, malleable and low alloy cast iron.

These drawbacks are overcome by an iron alloy for the adjustment of quantometers containing 3-4 wt.%. 0.2 to 1.6 wt. % manganese, 1.5 to 3 wt. 0.5 to 2 wt. % nickel and 0.2 to 1 wt. molybdenum according to the invention. It consists of 1 to 4 wt. % niobium, 0.1 to 0.3 wt. % vanadium and 0.01 to 0.12 wt. magnesium and the rest iron. According to a preferred embodiment, it may further comprise 0.01 to 0.08 wt. ceru.

The basic advantage of the invention is that in cast iron alloyed with magnesium or cerium, a fine, homogeneous and graphite-free structure achieves the required effect even at lower niobium concentrations compared to the Czech Republic. No. 196485, utilizing the synergistic effect of vanadium in a smaller content. With these alloys, the desired structure is achieved even at a level of eutecticity that would otherwise give rise to a heterogeneous, non-compliant structure spectrometry.

The alloy according to the invention is described in more detail below by way of example.

Example

500 samples with a base of 40 x 40 mm and a height of 26 mm were cast on a massive copper ingot mold. The sample material had the following composition, except iron contained in% by weight: C 3.7% by weight, Mn 1.1% by weight, Si 2.8% by weight, P 0.2% by weight, Ni 1.2% by weight, Nb 1 %, 1 wt. Mo 0.7 wt.%, V 0.27 wt.%, Mg 0.06 wt.%, Ce 0.04 wt.

All samples obtained showed a spectrometrically perfect portion up to a height of 10 mm from the chill cooling surface

Claims (2)

OBJECT OF THE INVENTION An iron alloy for quantometer adjustment, comprising 3 to 4 wt. % carbon, 0.2 to 1.6 wt. % manganese, 1.5 to 3 wt. % silicon, 0.5 to 2 wt. % nickel and 0.2 to 1 wt. % molybdenum, characterized in that it contains 1 to 4 wt. % niobium, 0.1 to 0.3 wt. vanadium and 0.01 to 0.12 wt. magnesium and the rest iron. 2. An alloy as claimed in claim 1, characterized in that it comprises 0.01 to 0.08% by weight of an alloy. cerium.