Birta aan lahayn birta waa walxo xagal leh oo bir aan lahayn. Waxaa loo isticmaali karaa in lagu beddelo noocyo kala duwan oo ah xoqidda macdanta iyo kuwa aan birta ahayn, sida alumina, silicon carbide, ciid quartz ah, kuul galaas ah, iwm.
Ciidda birta aan lahayn birta waxaa inta badan loo isticmaalaa nadiifinta dusha sare, ka saarista rinjiga iyo ka saarista biraha aan lahayn birta iyo alaabada birta aan lahayn birta, taasoo sameysa qallafsanaan dusha sare ah, sidaas darteed si gaar ah ugu habboon daaweynta dusha sare ka hor inta aan la dahaadhin. Marka la barbardhigo xoqidda aan birta ahayn, ciidda birta aan lahayn birta waxay gacan ka geysataa yareynta kharashyada hawlgalka iyo qiiqa boodhka iyo hagaajinta jawiga shaqada.
Birta aan miridhku lahayn waxay leedahay cimri dheer oo adeeg iyo hufnaan sare oo qarax ah, waxay fududaynaysaa habka qaraxyada, waxay kaydinaysaa kharashka, waxayna gaadhaysaa tayo qarax oo deggan, qallafsanaan iyo muuqaal isku mid ah.
| Mashruuc | Tayada | |
| Halabuurka kiimikada% | Cr | 25-32% |
| Si | 0.6-1.8% | |
| Mn | 0.6-1.2% | |
| S | ≤0.05% | |
| P | ≤0.05% | |
| Adkaanta | HRC54-62 | |
| Cufnaanta | >7.00 g/cm3 | |
| Baakad | Tan kasta oo ku jira Baakad gaar ah iyo tan kasta oo loo qaybiyay 25KG baakado. | |
| QAYBINTA CABBIRKA EE DUFKA BIRTA AH EE AAN DAXAN LAHAYN | ||||||||
| Lambarka Shaashadda. | In | Cabbirka shaashadda | G18 | G25 | G40 | G50 | G80 | G120 |
| 14# | 0.0555 | 1.4 | Dhammaan Gudubyada |
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|
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| 16# | 0.0469 | 1.18 |
| Dhammaan Gudubyada |
|
|
|
|
| 18# | 0.0394 | 1 | 75%daqiiqad |
| Dhammaan Gudubyada |
|
|
|
| 20# | 0.0331 | 0.85 |
|
|
|
|
|
|
| 25# | 0.028 | 0.71 | 85% daqiiqo | 70% daqiiqo |
| Dhammaan Gudubyada |
|
|
| 30# | 0.023 | 0.6 |
|
|
|
|
|
|
| 35# | 0.0197 | 0.5 |
|
|
|
|
|
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| 40# | 0.0165 | 0.425 |
| 80% daqiiqo | 70% daqiiqo |
| Dhammaan Gudubyada |
|
| 45# | 0.0138 | 0.355 |
|
|
|
|
|
|
| 50# | 0.0117 | 0.3 |
|
| 80% daqiiqo | 65% daqiiqo |
| Dhammaan Gudubyada |
| 80# | 0.007 | 0.18 |
|
|
| 75%daqiiqad | 65% daqiiqo |
|
| 120# | 0.0049 | 0.125 |
|
|
|
| 75%daqiiqad | 65% daqiiqo |
| 200# | 0.0029 | 0.075 |
|
|
|
|
| 70% daqiiqo |
