AISI4340
ASTM A-29, API 7-1
GENERAL SCOPE:
AISI 4340 is a low alloy steel containing nominally 0.4% Carbon, 0.8% Cr, 0.25% Mo and 1.8% Ni. Higher strength levels up to 150 KSI 0.2% PS may be achieved by suitable heat treatment. Often used in preference to AISI 4140 at the higher strength levels because of its better hardenability and improved CVN impact toughness. Generally, the material is used in applications for subsea components such as running tools, seals and hangers.
ADDITIONAL INFORMATION
The Nickel content gives this alloy the ability to exhibit excellent impact properties at room temperature and lower. It is also one of the deeper hardening low alloy steels available.
This alloy is not recommended for applications that involve exposure to Hydrogen Sulfide, in accordance with NACE MR-01-75/ISO-15156.
CHEMICAL COMPOSITION:
| C | Si | Mn | P | S | Cr | Ni | Mo | Fe | |
|---|---|---|---|---|---|---|---|---|---|
| Minimum | 0.38 | 0.15 | 0.60 | 0.70 | 1.65 | 0.20 | 0.00 | ||
| Maximum | 0.43 | 1.35 | 0.80 | 0.035 | 0.040 | 0.90 | 2.00 | 0.30 | 0.00 |
MECHANICAL PROPERTIES:
Condition Hardend and Tempered
| U.T.S. | 150 KSI Min | (1034 N/mm2) |
| 0.2% Proof Stress | 130 KSI Min | 896 (N/mm2) |
| Elongation | 13% | |
| Red of Area | 14% | |
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.