253 MA stainless steel is a nickel-saving heat-resistant steel with high creep strength and oxidation resistance up to 1150°C(2102℉).It combines excellent corrosion resistance with favorable machinability.Suitable for tubos de aço inoxidável e acessórios in chemical,petroleum,and high-temperature environments.
253 MA Standards
| Nome da liga | Material No. | EN Designation | UNS | China GB |
|---|---|---|---|---|
| 253MA | 1.4835 | X9CrNiSiNCe21-11-2 | S30815 | 1Cr25Ni20Si2 |
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Key Characteristics of 253 MA
It exhibits high strength at 900°C(1652℉) and possesses excellent long-term high-temperature performance (creep resistance and endurance).
In air,it can be used up to 1150°C(2102℉) under non-pressure conditions, with a scale formation temperature as high as 1150°C and exceptional oxidation resistance.
At various temperatures,its short-term tensile strength exceeds that of conventional stainless steels (such as 304 e 310S) by over 20%.It exhibits high yield strength and tensile strength at elevated temperatures,enabling normal operation in environments up to 1050°C(1922℉).This makes it suitable for diverse heat treatment processes and high-temperature gas applications.
Containing high proportions of elements such as chromium (Cr) and nickel (Ni),these elements provide excellent resistance to general corrosion and corrosão por pite,particularly in chloride-containing environments.It exhibits good resistance to a wide range of chemical media,including acids and alkalis,making it especially suitable for petroleum,chemical,and marine environments.
Possesses excellent formability,weldability,and sufficient machinability.During processing and forming,it facilitates fabrication into products of various shapes and dimensions,and also enables the manufacture of complex shapes and structures.
Due to its alloy composition,this material exhibits good resistance to rachaduras por corrosão sob tensão and is suitable for applications involving stress in ambientes corrosivos.
Composição química
| Elemento | C | Si | Mn | P | S | Cr | Ni | N | Ce |
|---|---|---|---|---|---|---|---|---|---|
| Conteúdo (wt%) | 0.05 – 0.12 | 1.40 – 2.50 | ≤ 1.00 | ≤ 0.045 | ≤ 0.015 | 20.00 – 22.00 | 10.00 – 12.00 | 0.12 – 0.20 | 0.03 – 0.08 |
Mechanical & Physical Properties
| Propriedade | Resistência à tracção | Resistência ao escoamento (0,2% Offset) | Alongamento | Dureza | Densidade |
|---|---|---|---|---|---|
| Valor (típico) | ≥ 650 – 850 MPa(95 – 123 ksi) | ≥ 310 MPa(45 ksi) | ≥ 40 | ≤ 210 | 7.80g/cm³ |
- Coefficient of Thermal Expansion:
Average of 13.7×10⁻⁶/K between 20°C and high temperatures. - Condutividade térmica:
Approximately 15 W/m·K (at 20°C). - Electrical Resistivity:
0.85 Ω·mm²/m.
253 MA Applications
| Application Field | Tipo de componente | Component Detail | Size Range | Finalidade |
|---|---|---|---|---|
| Metallurgical | Pipe | Recuperator | ≈ 1/2″ – 24″ | Heat Recovery |
| Blast Furnace | Coal Injection | |||
| Tratamento térmico | Radiant Tube | Furnace Element | ||
| Thermocouple | Protection Tube | |||
| Fitting | Corrugated box | – | Alta temperatura | |
| Petroquímica | Pipe | Styrene Reactor | ≈ 1/2″ – 24″ | Process Tube |
| EDC Cracking | Thermal Process | |||
| Convection Tube | Ethylene Cracking | |||
| Power Industry | Boiler Nozzle | Combustion Part | ||
| Refinery/Chemical | Fitting | Trocador de calor | – | Component Part |
| Expansion Bellow↓ | Thermal Stress | |||
| Refining Industry | Buttweld Elbow | Fluid Redirection | ||
| Buttweld Tee | Branch Connection | |||
| General Furnace | Redutor | Change Diameter | ||
| Sintering/Cement | Cyclone Separator | High Temp Dust |
253 MA stainless steel pipes have a wide nominal size range.
Common seamless pipe sizes range from approximately 1/2“ to 8” NB, while welded pipe sizes range from approximately 6“ to 24” NB (NB = Nominal Bore).
The table uniformly uses ≈ 1/2“ to 24” to indicate the approximate size range of the pipes.
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