F12 class 2
ASTM A182
Normalized tempered (+NT) / Annealed (+A)
PROPERTIES AND APPLICATIONS
Grade F12 class 2 is a chromium-molybdenum alloy steel. The addition of chromium enhances the steel's resistance to oxidation and high-temperature corrosion, while molybdenum improves its high-temperature strength and creep resistance. Creep is the tendency of a material to deform permanently under constant stress at elevated temperatures, and creep resistance is vital for components operating in such conditions.
ASTM A182 Grade F12 Class 2 offers a valuable combination of properties:
High-Temperature Strength: Excellent resistance to tensile and yield strength reduction at elevated temperatures.
Creep Resistance: Ability to withstand deformation under sustained stress at high temperatures.
Corrosion Resistance: Chromium content provides enhanced resistance to oxidation and corrosion.
Weldability: Can be welded using appropriate procedures.
These properties make it a preferred material for components that must maintain their structural integrity and performance in challenging high-temperature environments.
ASTM A182 Grade F12 Class 2 finds widespread use in industries where high temperatures and pressures are common:
Power Generation: Used in boiler components, superheater tubes, and high-pressure steam piping systems.
Petrochemical Industry: Employed in heat exchangers, pressure vessels, and piping systems that handle hot hydrocarbons.
Refining: Used in equipment that processes crude oil at high temperatures.
Chemical Processing: Used in reactors and piping systems that handle corrosive fluids at elevated temperatures.
When designing systems that operate at elevated temperatures, considering the performance characteristics of this steel grade is essential for ensuring safety, reliability, and longevity.
CORRESPONDENCE TO INTERNATIONAL DESIGNATIONS
| QUALITY | EUROPE | GERMANY | FRANCE | SPAIN | G.B. | USA | |
|---|---|---|---|---|---|---|---|
| EN | DIN | Werks.n. | AFNOR | UNE | B.S. | ASTM | |
| F12 class 2 | ~13CrMo4-5 | ~ 13CrMo4-4 | ~1.7335 | ~ 10CD6 | F2631 | 621 | ASTM A182 ASME SA 182 |
CHEMICAL ANALYSIS
| C | Mn | Si | P max | S max | Cr | Mo |
|---|---|---|---|---|---|---|
| 0,10 ÷ 0,20 | 0,30 ÷ 0,80 | 0,10 ÷ 0,60 | 0,040 | 0,040 | 0,80 ÷ 1,25 | 0,44 ÷ 0,65 |
CONCENTRATION LIMITS OF THE ELEMENTS THAT ARE NOT INDICATED IN THE TABLE CAN BE DEDUCED IN THE EN 10020 REGULATION.
MECHANICAL CHARACTERISTICS
| STEEL | NORMALISATION TEMPERATURE 900°C MIN – TEMPERING TEMPERATURE 620°C MIN | |||||
| SYMBOLIC | Re min | Rm min | A min | Z min | Durezza HB | |
| N/mm2 | % | % | max | |||
| F12 | 275 | 485 | 20 | 30 | 143÷207 | |
USUALLY AVAILABLE EX STOCK
| M.T. COLORATION | QUALITY | HEAT TREATMENT | SURFACE | DIAMETER (mm) |
|---|---|---|---|---|
 |
F12 class 2 | Normalised and stress relieved | rolled / forged turned | 20-450 |
 |
F12 class 2 | Annealed | rolled | 20-220 |
 |
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