Document xzav2rYZNM221LMoOpyObGKdb

Steel Research Center 1 Proqrers Report 'i'i'P) roject No.'**e i.vi'. i* / Author -- *- / / A J "C fcO I Asbestos free hot-tens Hnt-iox/g with mir.ernllv-oci in -lace of a she rites and wheat flour rcplaci.?.,? mart cf the stgndt.rj resin Af;ou.ViPtioi: Ii-i the development work of an asbestos free hot-tot cne of i the ways tried is to replace asbestos vith mineral wool. This report shoves the result of trials performed in the iitoelv.-orhc at Sardvihi' All the recipes contain mineral wool and wheat flour. Surniary All hot-tops vith mineral wool and wheat flour in place :f blue asbestos and part of the standard resin gave more pipe than t he ctare: ard E-box. The result corresponds with the Anri tec tests. The largest difference r. pipe between standard- E-box and miner;.: wool E-box war. 0.2 at ft pipe 'level of .about 7-3 '.Then usir.,;- mineral wool and wheat flour, the degree of erosion is greater than r, craftily. The present trials eor.firr- the result- of our earlier trials viti mineral 'wool hot-tops performed during the dust three years, s. ' the- results so far are also in agreement with the experiences re ported in a Prof ax ??evs`J.cttor of December 1967. The only really positive substitute for asbestos that v.-c- have ion., up to r.ov.- is fibre -lass, which v;as shown already in 1965. T'-i material has a prohibitive price, however. Further trials with mineral wool E-box '.vith "standard resin are un di e r pc rf o man c e. .... .... Trial serforv.unoc- and result -n- i All hot-tepr. used were manufactured by A3 E-box. The- inrot wo ip! A. v.-as about 2500 kr and the steel grades were carbon steel with 0. or C. 3p f C. The recipes are shown in table Fo. 1 and also the testminute:. the hr 1-top s'!?.bs. the Amitcc-tests and the pipe levels. The analysis of the mineral wool is shove, in table i'o. 2. The ..o ; .1 core tor of the fibres was .abort 5/U. A-. if c The hct-iops reru observed during teeming and crackir.r did oc,u: or. the- inincrul wool hot-top than on t'.:c standa'*-- When <vxarir.ing cold inlets it v:as observed that the stripping properties were not as good an normally. lioweve: , the ou the head:; from steel penetration into the. slab:; were not hew and hardly any difference between nincr.O *col hot-topo and :.J *37 E-b?x us to .the surface finish after prorol] .ur the ingotis to 260 nun 3 was observe?.. Using. mineral wool hot-tops on otainl.c-rr. steel would probably result in bad surfaces or. the bloods, be?;:; of the smaller sealing effect in the soaking pits. Sandviher. 19 th March .i960 Half /.geborg Copy to2ir. J.C-. Edntrb.v: . Porsr.on Inf. Gr'iii'.baar.' I Ti'i THT/G A3 E-box 2 copies Poser-o L\,t. T.P.' I cow.. v .. .. , I Uj Or i if I 0441 r* i: t; O IV 'J a n it j c ter. ; r c n '- It? q:iJ c in e le v e l f*' c> : . ... 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