F22
LOW ALLOY STEEL
UNS K21590: ASTM A182
GENERAL SCOPE
Grade F22 is a low alloy steel containing nominally 2.25% chromium. The alloy is widely used in the oil patch wellhead applications for connectors, hangers and block valves. Hardness levels up to 22 HRC are approved to NACE MR0175.
The grade is often used as the base metal for clad components. With targeted cast analysis and Howco’s heat treatment control, properties of 75 KSI yield strength can be achieved in the post-weld condition for large section components.
CHEMICAL COMPOSITION
| C | Si | Mn | P | S | Cr | Mo | Fe | |
|---|---|---|---|---|---|---|---|---|
| Min | 0.05 | . | 0.30 | . | . | 2.00 | 0.87 | 0.00 |
| Max | 0.15 | 0.50 | 0.60 | 0.040 | 0.040 | 2.50 | 1.13 | 0.00 |
MECHANICAL PROPERTIES
Condition: Normalised, Hardened and Tempered to 75 KSI
| U.T.S | 95 KSI Min | (655 N/mm2) |
| 0.2% Proof Stress | 75 KSI Min | (517 N/mm2) |
| Elongation | 18% | |
| Red of Area | 35 % |
NACE MR0175 limits the supply hardness to 22 HRC max.
Condition: Normalised, Hardened and Tempered to 105 KSI
| U.T.S | 125 KSI Min | (862 N/mm2) |
| 0.2% Proof Stress | 105 KSI Min | (724 N/mm2) |
| Elongation | 15 % | |
| Red of Area | 30 % |