SU718218A1 - Material for open-ended mold - Google Patents

Description

(54) MATERIAL FOR CRYSTALLIZER

The invention relates to metallurgy in the field of foundry, in particular, to materials for manufacturing and for continuous mold casting molds. It is known to use molds for continuous casting plants of graphite materials of the MG, MG-1 GMZ, GE grades. The initial ingredients of graphite of MG brand are calcined coals of various granulometric composition and P.J. The disadvantages of the known material are high porosity, insufficient oxidation resistance, low strength properties, as well as the density and duration of technological processes for its preparation. The aim of the invention is to reduce the porosity, improve the strength properties, as well as simplify the manufacturing technology of the material. The goal is set by the fact that the material additionally contains a copper phenol-formaldehyde resin, stearin, urotropin and boron nitride in the following ratio of cocktails, wt.%: Artificial graphite fraction 1.5-0.5 mm51-65 friction 0.16-0 mm21 -32 Novolac phenol-formaldehyde resin11-13 Stearin 1.7-2.3 Urotropin 1.2-1.4 Boron nitride 0,1-O, 3 The composition is prepared using a sukhovaltsovy method, followed by pressing the mold blanks into a matrix or a piercing method depending on required mold profile and pouring configuration. The pressed billet molds burned by 100-110-hour. maximum temperature mode ob371

, gig 1000-1300 ° С in the medium of carbon overfilling.

 The proposed material for casting molds (molds), in contrast to the prototype, has high mechanical strength indices, low porosity and, therefore, lower oxidability during operation.

In tab. 1 shows the composition of the proposals.

tat material.

Tab, 2 shows the properties of the proposed material and the prototype.

19.5-1, G

488

514

333

152

178 167 According to the composition 1, the crystallizers are made with the following dimensions: diameter 250/210 mm, length 250 mm into the matrix at a pressing temperature of 110-140 ° C, exposure 40 minutes. According to the compositions 2 n 3, crystallizers were made with dimensions i diameter 134/90 m, length 75О-1800 mm, by piercing pressing at 130-175 С with a pressing speed of 10-12 cm / min. The operational tests of the proposed material show that the crystallizers from it with continuous elimination of the profile products serve a long time in connection with a decrease in the oxide capacity of the material by an average of 2O%, while significantly improving the qualities of the castings.

iT a fi J and c a

Tablipa 2

24-26

28-31

350-400

230-26O

Claims (1)

280 140-160 Crystallizers of the proposed material can be widely used in folk farms in foundry materials. According to their technological and physicomechanical properties, they can be directly compressed into a matrix or pierced by a mold in size instead of complex mechanical processing. At the same time, there is no waste material, which during machining is 2 ~ 40%, depending on the configuration of the shape and size of the blanks, and the increased resistance of the new material to oxidation during operation ensures that the molds work during the casting of metals for more than 10 hours. as forms of graphite (prototype), on average, are suitable for work for 5-7. including plants Pentrolyte, plants, hard alloys and superhard materials, etc. The invention The material for the mold of the continuous casting of metals, containing graphite as a base, is similar to the fact that, with a chain of reducing porosity, improving the properties of the tailings, as well as simplifying the manufacturing technology, the material additionally contains novolac phenol-formaldehyde resin, stearin, urotropin and boron nitride in the following ratio, components, wt.%: 71 Artificial graphite fraction 1.5-0.5 mm51-65 fraction 0.16-0 mm21-3U Novolachna phenol formal ehygene cMop & 11-15 Stearin 1.7-2.3 Urotropin1,2-1,4 Nit Read bora0.1-O, 3 Sources of information, 80 attention for examination. Construction materials and whether based on carbon. Mi, G970, (prototype).