Nooca 440 steel steel, oo loo yaqaan "birta garka garka", waa birta chromium-ka karbon-sare ee la adkeyn karo. Marka la hoos geliyo daawaynta kulaylku waxay gaartaa heerarka ugu sarreeya ee engegnaanta heer kasta oo ah birta aan-tusanayn. Nooca 440 Stainless Steel, kaas oo ku yimaada afar darajo oo kala duwan, 440A, 440B, 440C, 440F, waxay bixisaa iska caabin daxalka wanaagsan oo ay weheliso iska caabbinta abrasion. Dhammaan darajooyinka si fudud ayaa loogu farsamayn karaa xaaladdooda la tirtiray, waxay sidoo kale bixiyaan iska caabbinta asiidhka khafiifka ah, alkalis, cuntooyinka, biyaha cusub, iyo hawada. Nooca 440 waxaa lagu adkeyn karaa Rockwell 58.
Waad ku mahadsan tahay darajooyin kasta guryaha aadka u wanaagsan, dhammaan darajooyinka Nooca 440 ee birta aan lahayn waxaa laga heli karaa tiro alaabo kala duwan oo ay ka mid yihiin:
- biinanka pivot
- Qalabka ilkaha iyo qalliinka
- Mindiyada tayada sare leh
- Kuraasta Valve
- Nozzles
- Bambooyinka saliidda
- Xirmooyinka curiyaha wareega
Fasalo kasta oo ah Nooca 440 Birta Aan-la-hayntu waxa uu ka kooban yahay hal-abuur kiimiko oo gaar ah. Waa in la ogaadaa in farqiga ugu weyn ee u dhexeeya darajooyinka uu yahay heerka Kaarboon
Nooca 440A
- Cr 16-18%
- Mn 1%
- Si 1%
- Mo 0.75%
- P 0.04%
- S 0.03%
- C 0.6-0.75%
Nooca 440B
- C 0.75-0.95%
Nooca 440C iyo 440F
- C 0.95-1.20%
Waqtiga boostada: Oct-09-2020