AISI 4140 MODIFIED / UNS G41400
MATERIAL DESCRIPTION
AISI 4140 is a 1% chromium – molybdenum medium hardened general purpose high tensile steel – generally supplied hardened and tempered in the tensile range of 850 – 1000 MPa.
Applications
AISI 4140 modified is a low alloy hardened and tempered steel suitable for the manufacture of oil and gas downhole tools used in production and completion processes. General Engineering applications include construction components exposed to heavy strain, such as shafts, gear, bolts etc. AISI 4140 can also be used in hardened condition as machine parts exposed to heavy wear.
Heat Treatment
Hardened at 850°C followed by water quenching. Tempering at min. 650°C, cooled in air.
Weldability
Moderate, can be welded.
Chemical composition
| Weight % | C | Si | Mn | Cr | Mo | S | P |
| Min. | 0,38 | 0,15 | 0,75 | 0,90 | 0,15 | ||
| Max. | 0,43 | 0,35 | 1,00 | 1,20 | 0,35 | 0,025 | 0,025 |
Product Standards: ASTM A29 (4140), EN 10083 – 1, 42CrMo4, API 6A.
Approvals: NACE MR0175/ 22HRC.
Mechanical Properties
| Yield strength Rp0.2, MPa |
Tensile strength Rm, MPa |
Elongation [%] |
Hardness [HB] |
Impact, Charpy-V, -46ºC [J] |
| 551-665 | ≥ 690 | ≥ 20 | 217-235 | ≥ 27 |
ROUND BAR STOCK – MIN YLD 80 KSI
(18-22 HRC)
| DIA | DIA |
| 1″ | 7″ |
| 1,5″ | 8″ |
| 2″ | 8.5″ |
| 2.5″ | 10″ |
| 3.5″ | 11″ |
| 4″ | 12.25″ |
| 5″ | 14.375″ |
| 5.25″ | 16″ |
| 6″ | 18″ |
| 6.5″ | 20″ |
HOLLOW BORED BAR STOCK – MIN YLD 80 KSI
(18-22 HRC)
| DIA |
| 5″ OD x 2.25″ ID |
| 5″ OD x 3″ ID |
| 7″ OD x 2.25″ ID |
| 7″ OD x 3″ ID |
| 7″ OD x 4″ ID |
| 7.5″ OD x 3″ ID |
| 8″ OD x 2.25″ ID |
| 8″ OD x 3″ ID |
| 8.5″ OD x 3.5″ ID |
| 8.5″ OD x 5.5″ ID |
| 10″ OD x 3″ ID |
| 12.25″ OD x 3″ ID |
Equivalent Standards
- EN 1.7225
- UNS G41400
- AISI 4140 Modified