40CrNiMoA baja dipaké sanggeus quenching na tempering, sarta dipaké pikeun rancang bagian penting merlukeun plasticity alus, kakuatan tinggi na ukuranana badag. Contona, shafts tugas beurat dina mesin tugas beurat, shafts turbin uap kalayan diaméter leuwih gede ti 250 mm, bilah, transmisi, fasteners, crankshafts, gears, jsb, ogé bisa dipaké pikeun shafts rotor jeung wilah operasi dina suhu ngaleuwihan 400 °C.
Runtuyan baja alloy low Chrome-Moly ngandung 0,5% - 9% Cr sareng 0,5% - 1% Mo sareng langkung handap tina 0,20% karbon. 40CrNiMoA, 4340 sareng SNCM439 mangrupikeun bahan baja chromoly alloy low tina standar anu béda.
4340 sareng SNCM439 mangrupikeun standar ti Amérika sareng Jepang masing-masing. Dina kalolobaan kaayaan aranjeunna tiasa janten bahan alternatif, kecuali aya catetan khusus atanapi dianggo pikeun tujuan khusus. Bedana maranéhanana utamana aya dina unsur kimia, rinci ditémbongkeun saperti kieu:
Standar
|
GB
|
AISI
|
JIS
|
Bahan
|
40CrNiMoA
|
4340
|
SNCM439(SNCM8)
|
C
|
0.37~0.44
|
0.38~0.43
|
0.36~0.43
|
Si
|
0.17~0.37
|
0.15~0.35
|
0.15~0.35
|
Bungbulang
|
0.50~0.80
|
0.60~0.80
|
0.60~0.90
|
P
|
≤0,025
|
≤0,035
|
≤0,030
|
S
|
≤0,025
|
≤0,040
|
≤0,030
|
Cr
|
0.60~0.90
|
0.70~0.90
|
0.60~1.00
|
Ni
|
1.25~1.65
|
1.65~2.00
|
1.60~2.00
|
Mo
|
0.15~0.25
|
0.20~0.30
|
0.15~0.30
|