AISI 4145H MOD
ASTM A-29, API 7-1, API 14A
GENERAL SCOPE:
AISI 4145 is a common low-alloy steel with 0.20% molybdenum, widely used in the oil industry. It's similar to 4140 but has better hardenability, making it popular for higher strength requirements. Larger diameters are often supplied with higher molybdenum level, 0.35% max, this may also be used on higher strength variants at smaller diameters. This steel is widely used in making drill collars.
ADDITIONAL INFORMATION:
As compared to 4140, the 4145 mod grade has higher levels of Chromium and Molybdenum, which will provide much deeper hardening into the steel after austentizing, quenching and tempering.
This alloy should not be confused with AISI 4145, as the chemical limits for the modified version are much higher.
CHEMICAL COMPOSITION:
| C | Si | Mn | P | S | Cr | Mo | Fe | |
|---|---|---|---|---|---|---|---|---|
| Minimum | 0.43 | 0.15 | 0.75 | 0.80 | 0.15 | 0.00 | ||
| Maximum | 0.48 | 0.35 | 1.00 | 0.035 | 0.040 | 1.10 | 0.25 | 0.00 |
MECHANICAL PROPERTIES:
Condition Hardend and Tempered to 22 HRC max
| U.T.S. | 100 KSI Min | (689 N/mm2) |
| 0.2% Proof Stress | 80 KSI Min | 551 (N/mm2) |
| Elongation | 20% | |
| Red of Area | 40% | |
| Condition Hardend and Tempered to 30-36 HRC | ||
Important Note:
Information given in this data sheet about the condition or usability of materials respectively products are no warranty for their properties, but act as a description. The information we give on for advice, comply to the experiences of the manufacturer as well as our own. We cannot give a warranty for the results of processing and application of the products.