20crmnti (GB/T 3077) se yon alyaj carburizing wonn asye optimisé pou angrenaj, ak yon chimi ki amelyore dite sifas pandan w ap kenbe yon nwayo difisil:
0.17-0.23% C: ba ase yo ki pèmèt gwo twou san fon carburizing (0.8-1.2mm ka pwofondè) men ase yo bay fòs debaz.
1.00-1.30% CR: Amelyore hardenability, asire sifas la carburized reyalize segondè dite (58-62 HRC) pou rezistans mete.
0.80-1.10% MN: Amelyore hardenability ak fòs rupture nan nwayo a.
0.04-0.10% TI: rafine grenn austenit pandan carburizing (900-950 degre), anpeche kwasans grenn jaden ak fragilite nan chalè a - zòn ki afekte yo.
0.17-0.37%SI, P mwens pase oswa egal a 0.035%, s mwens pase oswa egal a 0.035%: balans machinabilite ak severite.
Apre carburizing ak asouvisman, 20Crmnti devlope yon difisil, mete - sifas rezistan ak yon nwayo ductile (30-35 HRC), ideyal pou angrenaj transmisyon otomobil ak bwat endistriyèl. Li ekivalan a AISI 8620 (USA) ak DIN 1.5815 (Almay), ak te fè - nan - Lachin lis maketing li kòm "20crmnti alyaj asye wonn ba pou Kovèti pou Kovèti pou."