X9CrNiSiNCe21-11-2, 1.4835, 253MA - High-alloy heat-resistant chromium-silicon-nickel steel with the addition of cerium and nitrogen according to PN-EN 10088-1 and PN-EN 10095.

 

StandardsSteel Grades
Chemical Composition %
C:Mn:Si:P:S:Cr:Mo:Ni:Ce:N:
EN / DINX9CrNiSiNCe21-11-2 - 1.4835 - X 9 CrNiSiNCe 21-11-2 - 4835
0.05 - 0.12<1.001.40 - 2.50<0.045<0.01520.00 - 22.00-10.00 - 12.000.030 - 0.0800.12 - 0.20
GOST 
ISO
X7CrNiSiNCe21-11
0.05 - 0.10<0.801.40 - 2.00<0.040<0.03020.00 - 22.00-10.00 - 12.000.030 - 0.0800.14 - 0.20
SANDVIK253 MA® - 253MA® - MA253
0.08<0.801.60<0.040<0.04021.00-11.000.0500.17
Outokumpu253 MA® - 253MA®
0.05 - 0.10<0.801.40 - 2.00<0.04<0.01520.00 - 22.00<0.5410.00 - 12.000.030 - 0.0800.14 - 0.20
ASTMUNS S 30815 - UNS S30815
0.05 - 0.10<0.801.40 - 2.00<0.040<0.03020.00 - 22.00-10.00 - 12.000.030 - 0.0800.14 - 0.20
RARA 253 MA - RA253MA - RA 253MA
0.05 - 010<0.801.40 - 2.00<0.04<0.0320.00 - 22.00-10.00 - 12.000.030 - 0.0800.14 - 0.20

 

Stal 253 MA®, X9CrNiSiNCe21-11-2, 1.4835 - opis i specyfikacja

Heat-resistant austenitically high-alloyed steel with cerium, used in isothermal conditions, ideal for temperatures up to 700 - 1100oC. At higher temperatures, it exhibits high abrasion resistance and thermal expansion, resistance to deformation, high creep resistance, sulphation (sulfur compounds), erosion and corrosion, oxidation, exhaust gases in cyclical circulation, and steam.

Steel, unlike the H25N20S2, X15CrNiSi25-21, contains less chromium and nickel, which contributes to the implementation of more cost-effective project solutions. In addition, the performance of the alloy allows the use of smaller dimensions and thinner thickness of products in the majority of applications when compared to the common austenitic CrNiSi steels. Addition of nitrogen reduces material embrittlement phase σ.

Main feature of 253MA® steel is a surface which is coated with a protective layer of Cr2O3 oxide. It should also be added that the 253MA® steel (X9CrNiSiNCe21-11-2, 1.4835) is an easily accessible grade and, despite the austenitic structure, catches up with the resistance to sulfur compounds H18JS, X10CrAlSi18, 1.4742, and consistently H24JS, X10CrAlSi24, 1.4762.

The X9CrNiSiNCe21-11-2 grade has good resistance in carburizing atmospheres, gas carburizing and nitriding, but the AISI 310 and AISI 314 (X15CrNiSi25i, 1.4841, H25N20S2 equivalents) are still much better.

253 MA®, 1.4835 and X9CrNiSiNCe21-11-2 is used, inter alia, as steel for ash hopper covers, glass foundry molds, pipe hooks, heat exchangers, recuperators, valves, tubular guards, combustion chambers, impact separators, turbine and fan rotors, fireproof anchors, CFBC boilers, exhaust manifolds, heat treatment stands, steelworks, glass and cement industries, radiator pipes, air heating pipes in sulfuric acid gas converters, thermocouple tubes, burner components, heat treatment furnace tubes and styrene reactors and convection tubes.


253 MA®, X9CrNiSiNCe21-11-2, 1.4835 steel - Creep limit and creep resistance at elevated temperatures

Properties at temperatures elevatedTemperatures
600℃700℃800℃900℃1000℃
Creep resistanceRz/1000238 MPa105 MPa50 MPa24 MPa12 MPa
Creep resistanceRz/10000157 MPa63 MPa27 MPa13 MPa7 MPa
Creep resistanceRz/10000088 MPa35 MPa15 MPa8 MPa4 MPa
Creep limitR1/1000170 MPa66 MPa31 MPa15.5 MPa8 MPa
Creep limitR1/10000126 MPa45 MPa19 MPa10 MPa5 MPa
Creep limitR1/10000080 MPa26 MPa11 MPa6 MPa3 MPa

 


Mechanical and physical properties of 253 MA®, X9CrNiSiNCe21-11-2, 1.4835 steel in annealed condition +AT

The mechanical properties of X9CrNiSiNCe21-11-2 according to EN 10095
Tensile strengthRm650 - 850 MPa
Yield pointRe< 310 MPa
ElongationA> 37%
HardnessHB< 210 HB
Densityρ7,80 kg/dm3
Heat capacitycp20-100℃500 J ⋅ kg-1 K-1
Linear Expansion Factorα20-100℃17.0 - 19.5 ⋅ 10-6 K-1
Heat conductivityλ20℃15 W ⋅ m-1 ⋅ K-1
Electrical resistanceρ0.85 ⋅ 10-4 Ω ⋅ cm

 


Heat treatment and thermo-mechanical treatment of 253 MA®, X9CrNiSiNCe21-11-2, 1.4835 steel - temperatures and process

Heat treatment and thermo-mechanical treatment
ProcessCoolingTimeTemperatures
Softening annealingfast in the air or water5 - 20 min.1020 - 1120℃
stress relief annealingszybkie w powietrzu< 30 min.850 - 950℃
Thermo-mechanical treatment900 - 1150℃

 


Bending, forming and welding of 253 MA®, X9CrNiSiNCe21-11-2, 1.4835 steel

As with other high-alloyed austenitic steels, X9CrNiSiNCe21-11-2 is easy for cold working. For H25N20S2, X15CrNiSi25-21, 1.4841, for 253 MA products due to addition of nitrogen - N, it is necessary to use more force when cold forming steel.

Steel tends to spring, so it will be necessary to apply compensation. After cold bending you do not have to, but it is recommended in the case of bending, among others, pipes, to subject the product that will work at temperatures above 800oC to annealing. Hot bending should be carried out at temperatures of 850 - 1100oC. The plasticity of X9CrNiSiNCe21-11-2 is much better than plasticity of ferritic steels.

Welding of X9CrNiSiNCe21-11-2 steel is performed by arc welding by coated electrodes at 650 - 950oC, pure argon, plasma, and MIG (Ar + 0.03% NO, or Ar + 30% He + approx. 2.25% Co2). TIG and MIG provide the best creep resistance at high temperatures.


List of equivalents and other determinations of X9CrNiSiNCe21-11-2, 1.4835 steel:

 


List of equivalents and other determinations of X9CrNiSiNCe21-11-2, 1.4835 steel:

X 9 CrNiSiNCe 21-11-2, 4835, X7CrNiSiNCe21-11, 253 MA®, 253MA®, MA253, UNS S 30815, UNS S30815, 1.4893, 4893, X8CrNiSiN21-11, X 8 CrNiSiN 21-11, RA 253 MA, RA253MA, RA 253MA.


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