Icyapa cya SM490C

Munsi yicyuma cya Janpanese Jis g3106, SM490 ifite ibyiciro bitatu bitandukanye, aush nka SM490A, SM490B na SM490C, itandukaniro nyamukuru ni karubone irimo ibyiciro byibyuma. Ugereranije na SM490B, isahani yicyuma SM490C igomba gukorwa mubipimo byubushyuhe buke munsi ya 0 centigrade hamwe ningaruka ntoya yingufu zingufu kuri 47J, SM490B hamwe na 27J kubisate by'icyitegererezo.Niba abakoresha amaherezo bakeneye gukora ubushyuhe bwibyuma byubatswe byubatswe SM490C munsi ya Normalized, Quenched and Tempered, Tempered, bagomba gutanga iri jambo muri PO mugihe babitegetse .