40CrNiMoA baja digunakake sawise quenching lan tempering, lan digunakake kanggo Pabrik bagean penting mbutuhake plasticity apik, kekuatan dhuwur lan ukuran gedhe. Contone, shaft tugas abot ing mesin tugas abot, poros turbin uap kanthi diameter luwih saka 250 mm, blades, transmisi, fasteners, crankshafts, gears, lan sapiturute, uga bisa digunakake kanggo poros rotor lan blades operasi ing suhu ngluwihi 400 °C.
Seri baja paduan rendah Chrome-Moly ngemot 0,5% - 9% Cr lan 0,5% - 1% Mo lan luwih murah tinimbang 0,20% karbon. 40CrNiMoA, 4340 lan SNCM439 minangka bahan baja chromoly alloy kurang saka standar sing beda.
4340 lan SNCM439 minangka standar saka Amerika lan Jepang. Ing sawetara kahanan, bisa dadi bahan alternatif, kajaba ana cathetan khusus utawa digunakake kanggo tujuan khusus. Bedane utamane ana ing unsur kimia, rincian kasebut ditampilake ing ngisor iki:
|
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
|
|
Mn
|
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
|
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