AISI 4145H MODIFIED / UNS G41450
MATERIAL DESCRIPTION
AISI 4145H is a chromium – molybdenum low alloy tempered steel. It has improved hardenability and is more is commonly used in the high strength condition with minimum yield 125 ksi / 110 ksi.
Applications
AISI 4145H is a low alloy steel suitable for downhole drilling tools such as subs, x-overs, drill collars, pup-joints and fishing tools. General engineering applications include components exposed to heavy strain, such as shafts, gear, bolts etc. AISI 4145H can also be used in hardened condition as machine parts exposed to heavy wear.
Heat Treatment
Hardened and tempered.
Weldability
Poor, can be welded.
Chemical Composition (Specific for Bars)
| Weight % | C | Mn | P | S | Si | Cr | Ni | Mo | Cu | V | Al |
| Min. | 0,43 | 0,80 | 0,20 | 0,85 | 0,25 | 0,010 | |||||
| Max. | 0,48 | 1,20 | 0,020 | 0,020 | 0,35 | 1,20 | 0,25 | 0,35 | 0,30 | 0,05 | 0,035 |
Reference Standards
Bars:
-
ASTM A29 (for chemical only), type 125 ksi or 110 ksi.
Mechanical Properties (Specific for Bars)
| Yield strength Rp0.2, MPa |
Tensile strength Rm, MPa |
Elongation [%] |
Hardness [HB] |
Impact, Charpy-V, -20ºC [J] |
Impact, Charpy-V, 0ºC [J] |
|
| 125 ksi | 862 | 965 – 1103 | 14,5 | 285 – 341 | ≥ 27 | ≥ 41 |
| 110 ksi | 758 | 965 – 1068 | 14,5 | 285 – 341 | ≥ 27 |
Round Bar Stock
| DIA | DIA |
| 1.5″ | 180 mm |
| 1.75″ | |
| 2″ | 7.5″ |
| 3″ | 8″ |
| 2.5″ | |
| 3.5″ | 8.5″ |
| 4″ | |
| 5″ | |
| 5.5″ | 9″ |
| 6″ | 9.5″ |
| 7″ | 10″ |
| 11″ | |
| 12.25″ | |
| 13″ | |
| 15″ | |
| 16″ | |
| 17″ | |
| 18″ | |
| 20″ |
Hollow Bored Bar Stock
| DIA | DIA |
| 5″ OD x 1″ ID | 7.5″ OD x 3.5″ ID |
| 5″ OD x 1.5″ ID | 8″ OD x 2.25″ ID |
| 5’’ OD x 1.75’’ ID | 8″ OD x 2.5″ ID |
| 5″ OD x 2″ ID | 8″ OD x 3″ ID |
| 5″ OD x 2.25″ ID | 8″ OD x 4″ ID |
| 5″ OD x 2.5″ ID | 8.5″ OD x 3″ ID |
| 5″ OD x 3″ ID | |
| 6″ OD x 3.5″ ID | 8.5″ OD x 3.5″ ID |
| 7″ OD x 1.5″ ID | 8.5″ OD x 5.5″ ID |
| 7″ OD x 1.75″ ID | 9.5″ O x 3″ ID |
| 7″ OD x 2″ ID | 10″ OD x 3″ ID |
| 7″ OD x 2.25″ ID | 10″ OD x 4″ ID |
| 12.25″ OD x 3″ ID | |
| 7″ OD x 3″ ID | 12.25″ OD x 8″ ID |
| 7″ OD x 3.5″ ID | 14″ OD x 3″ ID |
| 7″ OD x 4″ ID | 390 mm OD x 250 mm ID |
| 7.5″ OD x 3″ ID | 16″ OD x 3″ ID |
| 20″ OD x 12″ ID |
Equivalent Standards
- EN 1.7225
- UNS G41450
- AISI 4145 Modified