RA 253 MA® Stainless Steel
UNS S30815
Description
RA 253 MA® stainless steel has been developed over 30 years. RA 253 MA® is a lean austenitic heat resistant alloy with high strength and excellent oxidation resistance. It provides the perfect combination of creep strength with excellent oxidation, vulcanization and high-temperature erosion resistance in alloys containing only 11% nickel. RA 253 MA® obtains its heat resistant properties by tight control of micro alloy additions and a combination of rare earths and silicon is responsible for the excellent oxidation resistance of this 21% Cr alloy. Due to its lean chemistry, RA 253 MA is very economical compared to most heat resistant alloys.
Chemical Component
| Ni | Cr | Mn | Si | C | N | Ce | S | P | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 10.0-12.0% | 20.0-22.0% | 0.80% max | 1.4-2.0% | 0.05-0.10% | 0.14-0.20% | 0.03-0.08% | 0.03% max | 0.04% max | Balance |
Basic Information
| Items | RA 253 MA® Stainless Steel |
|---|---|
| Catalog | ACMA-Fe-A042 |
| Density | 0.282 lb/in3 |
| Melting Range | 2500-2610 °F |
| Coefficient of Thermal Expansion, in/in°F x 10-6 | 70-1400 °F: 10.5; 70-1600 °F: 10.6; 70-1800 °F: 10.8 |
| Thermal Conductivity, Btu·ft/ft2·hr·°F | At 70 °F: 8.6; At 1400 °F: 14.3; At 1600 °F: 15.0; At 1800 °F: 16.5 |
| Electrical Conductivity, 68 °F (20 °C), %IACS | At 70 °F: 29.0; At 1400 °F: 20.0; At 1600 °F: 18.7; At 1800 °F: 17.6 |
Material Forms
Alfa Chemistry offers RA 253 MA® stainless steel in a variety of forms, including Pipe, Plate, Round Bar, Sheet, Weld Wire.
Mechanical Properties
- Representative tensile properties
| Temperature, °F | 68 | 1292 | 1562 | 1832 |
| Ultimate Tensile Strength, ksi | 102 | 56.4 | 24.8 | 10.8 |
| 0.2% Yield Strength, ksi | 51.6 | 23 | 14.6 | 6.2 |
| Elongation, % | 51 | 44 | - | - |
- Typical creep-rupture properties
| Temperature, °F | 1400 | 1600 | 1800 | 2000 |
| Minimum Creep 0.0001%/Hour, ksi | 5.0 | 2.3 | 0.09 | - |
| 10,000 Hour Rupture Strength, ksi | 5.2 | 2.5 | 1.2 | 0.7 |
Specifications
W. Nr./EN: 1.4893, 1.4835
ASME: SA-240, SA-479, SA-312, SA-249
Features
- Excellent oxidation resistance through 2000 °F
- High creep-rupture strength
- Excellent resistance to thermal shock
- Good weldability
Applications
- Pulverized coal burners in power boilers
- Recuperators
- Petrochemical, refinery and steam superheater tube hangers
- Radiant heating tubes for steel and aluminum annealing
- Thermal oxidizers
- Expansion bellows
- Furnace fans, dampers
- Fluidized bed combustor cyclones
- Rotary kilns and calciners
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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