SU84875A1 - Application of thermoelectric method for determining carbon in steel - Google Patents

Description

New technology to produce oecccMepoucKoii steel at any given carbon content requires a quick and accurate determination of carbon dioxide content in the steel before it is deoxidized. In order to reduce the open-hearth process, a rapid determination of carbon in the course of nlaiki is also required. Until now, the method of gasometric carbon deposition (by burning a sample of steel in a stream of oxygen) / g) is the only technique that can be used for the production of carbon. This: methodnka. The accuracy is quite satisfactory, it is not quite satisfactory in terms of speed of analysis, as its duration, from the moment of sampling to obtaining the results of analysis, is 10-15 minutes

By using the thermoelectric method O1 for determining the carbon content in steel before it is deoxidized, it is possible to reduce the time it takes carbon to become the solvent.

The thermoelectric ability has become (g) depends on the content of the components, the components in it, the structure, and the matrix, and the mechanical processing of the steel. Under the condition of quenching in iodine, the carbon power increases by 2.5 times, in this case, the thermoelectric power, electric power (i.e., d), steel also depends on the structure, the change in turn (during quenching ln) depends on the change in the irocylity content of the angle) in the steel.

The selection of grains for carbon iidereleii from the Bessemer converter is produced at the end of the second period, and in open-hearth melt 1: e-melting of the bath. This pernlakyuk characterizes that so that the quality of silicon and the normal conduct of the process fluctuates within 0.03–0.06%, and therefore the influence of the crusty process, e. d, c, steel can be taken as a constant value. The conditions for the selection of iroba provide for the acquisition of a metal of a certain structure (martensitic and trostite), and the change in the structure is completely dependent on the content

No. 84875-2 -

carbon in steel. Thus, carbon and steel carbon doping before breakup is sdipstiolshlm and OS1) o: i, 1dg factor, nl 1 figure for m. d. become.

FIG. 1 shows an iribor diagram for the oirdeleia of carbon in steel; in fig. 2-electric, device diagram.

To verticalio cToifKe 1 lr and reloi: staples die iap) a1 luy |, 11 (: lankas 2

Ilaiki guide; iodsr / jack two vertical alignment electrodes — hot electrode 5 and ho, -1d1 electrode | 6, 6. Hot 11 electrode is a medium rod of pure raffiropa type copper, the punga end of which has a core), epis head , circumscribing hemisphere. An angular thermometer with P1 and 200 ° is inserted into the head of the rod. A few heads per ster / kei are installed with a low-power electric furnace 7, the shape of the coupling is powered by a voltage transformer 8. With the help of a release spring 9 or h, the electrode always goes into the position of the transformer and then: pressing the lever 10, irnrenleipy to the upper part of the 1 st and 1; and.

The cold electrode 6 consists of an ebony rod, ending in the same part of a steel 11 needle. The passage through the plaques, this electrode with the aid of an ignition spring 11. Is always in a lowered state, and: only an irregular force is experienced and idle. and then, onj-said, irizhi.meg change.1eppuyu and onovaipe iznaytu.myuyu test 12 steel.

The cold and hot electrodes are connected by a conductor to a galvanometer, placed on the axis O) and the igigatpva. to the stoic of which the nerens ;; 11ku, l rio to the HjnrKpeH.ien galvanometer at the node of the Bryiel microscope. When iol, galvanometer t. E. d. It is measured not in the divisions of the scale of the galvanometer, and in the divisions: ilkalah mi1-; Brinel luxury.

The temperature of the hot e.) Ode is regulated by the use of a rheostat, which is included in the circuit between the transformer and the electric light. For the temperature of the cold electrode JtpHHjiMaeTCH, the temperature is ok)) and the average temperature of the hot and cold electrodes is selected depending on the operating conditions, from 100 to 130 °.

The sampling of the steel and the determination of k and: their carbon is reduced as follows. The metal is taken with iron.-Io / Kixoii so as to avoid falling into the spoon of Illaia. A spoon from a spoon with topic CTpj-eii 1P) is placed on the ground. The metal stream is encased with P1tyko yu shovel. to metal za. l / s part of the shovel. A shovel 1 place with irobov is quickly lowered with 1 gholo / i1nuyu notochnuyu water tempered 1 s sample at a water temperature of 20-25 °. When cooled, | r and |) both with a light blow on the solid, the object is separated from the spade, scanned, and at the same time, the guest achieves pa-paliz.

Subject n d e b lect

1.Prpmet1enpe thermoelectric method for determining carbon in steel, nanrnmer for: lontrol carbon burnout process in the course of steel melting.

2. Acceptance of the method and the way. 1. From l p h a yuschn ji so. that, in order to increase the 7 lp np contained in n: a carbon sample on the velcchip thermoelectric slider, calculated: the sample before the determination: 1st content: liquefied carbon dioxide is subjected to quenching.

3. For carrying out the method according to claims. 1-2 application of the device, made in the form of cold and heated electrodes made of various materials, pressed against the test specimen, and attached to an electric measuring instrument and under the action of springs.

FIG. I

12

 //////// Ш

Pui.2