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 трубы из нержавеющей стали а также арматура in chemical,petroleum,and high-temperature environments.
253 MA Standards
| Название сплава | Material No. | EN Designation | UNS | Китай 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 а также 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 точечная коррозия,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 коррозионное растрескивание под напряжением and is suitable for applications involving stress in коррозионные среды.
Химический состав
| Элемент | C | Si | Mn | п | S | Cr | Ni | N | Ce |
|---|---|---|---|---|---|---|---|---|---|
| Содержание (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
| Имущество | Предел прочности | Предел текучести (смещение 0,2%) | Удлинение | Твердость | Плотность |
|---|---|---|---|---|---|
| Значение (типичное) | ≥ 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. - Теплопроводность:
Approximately 15 W/m·K (at 20°C). - Electrical Resistivity:
0.85 Ω·mm²/m.
253 MA Applications
| Application Field | Тип компонента | Component Detail | Size Range | Назначение |
|---|---|---|---|---|
| Metallurgical | Труба | Recuperator | ≈ 1/2″ – 24″ | Heat Recovery |
| Blast Furnace | Coal Injection | |||
| Термическая обработка | Radiant Tube | Furnace Element | ||
| Thermocouple | Protection Tube | |||
| Fitting | Corrugated box | – | Высокая температура | |
| Нефтехимия | Труба | Styrene Reactor | ≈ 1/2″ – 24″ | Process Tube |
| EDC Cracking | Thermal Process | |||
| Convection Tube | Ethylene Cracking | |||
| Power Industry | Boiler Nozzle | Combustion Part | ||
| Refinery/Chemical | Fitting | Теплообменник | – | Component Part |
| Expansion Bellow↓ | Thermal Stress | |||
| Refining Industry | Buttweld Elbow | Fluid Redirection | ||
| Buttweld Tee | Branch Connection | |||
| General Furnace | Редуктор | 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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