4145
4145
General
AISI 4145 IS A CHROMIUM-MOLYBDENUM ALLOY STEEL GRADE WIDELY USED IN THE OIL AND GAS SECTORS. IT IS SIMILAR TO AISI 4140 AND 4130, BUT WITH A HIGHER CARBON CONTENT. 4145 IS MORE POPULAR IN LARGER DIAMETERS DUE TO ITS INCREASED STRENGTH AND HARDENABILITY. AISI 4145 IS COMMONLY SUPPLIED QUENCHED AND TEMPERED.
Uses
DRILL COLLARS, GEARS & SHAFTS, ROLLERS, PUMP SHAFTS AND TOOL HOLDERS.
Heat Treatment & Condition
HARDENED, QUENCHED AND TEMPERED
Chemical Analysis
C
·
0.43/0.49
Si
·
0.15/0.35
Mn
·
0.75/1.00
P
·
0.035 MAX
S
·
0.040
Cr
·
0.80/1.10
Ni
·
0.25 MAX
Mo
·
0.15/0.25%
| C | Si | Mn | P | S | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|
| 0.43/0.49 | 0.15/0.35 | 0.75/1.00 | 0.035 MAX | 0.040 | 0.80/1.10 | 0.25 MAX | 0.15/0.25% |
Typical Mechanical Properties
TEN. STRENTH
965 MPa
PROOF STRESS
827 MPa
ELONG.
14%
HARDNESS
277/331 HB
| TEN. STRENTH | PROOF STRESS | ELONG. | HARDNESS |
|---|---|---|---|
| 965 MPa | 827 MPa | 14% | 277/331 HB |