| Customization: | Available |
|---|---|
| Type: | Sheet |
| Standard: | AISI, ASTM, DIN, JIS, GB |
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Another proprietary designation covering this grade is 2111HTR.
253MA contains fairly low nickel content, which gives it some advantage in reducing sulphide atmospheres when compared to high nickel alloys and to Grade 310. The inclusion of high silicon, nitrogen and cerium contents gives the steel good oxide stability, high elevated temperature strength and excellent resistance to sigma phase precipitation.
The austenitic structure gives this grade excellent toughness, even down to cryogenic temperatures.
Composition
Typical compositional ranges for grade 253MA stainless steels are given in table.
Composition ranges for 253MA grade stainless steel
|
|
C |
Mn |
Si |
P |
S |
Cr |
Ni |
N |
Ce |
|
min. |
0.05 |
- |
1.10 |
- |
- |
20.0 |
10.0 |
0.14 |
0.03 |
| max. |
0.10 |
0.80 |
2.00 |
0.040 |
0.030 | 22.0 | 12.0 | 0.20 | 0.08 |
| Grade | UNS | DIN | EN | AMS | ASTM | JIS | |
| 253MA | S30815 | 1.4835 |
ASTM A240 ASTM A790 ASTM A815 ASTM A182 ASTM A276 ASTM A476 ASTM A789 |
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Corrosion Resistance
Although not designed for aqueous corrosion resistance the high chromium and nitrogen contents give the grade a pitting resistance approximating that of 316. 253MA does however have a high carbon content so is highly susceptible to sensitisation from welding or service exposure.
Oxidation - excellent resistance to air, at temperatures up to 1150°C. At high temperatures the steel quickly forms a thin, highly adherent and elastic oxide. This oxide gives good protection even under cyclic conditions.
Carburisation - Under oxidising conditions this grade can perform well, but alloys with higher nickel content are preferred if the atmosphere is reducing.
Sulphidation - good resistance to sulphur-bearing gases in an oxidising atmosphere, even if only traces of oxygen are present. Reducing gases prevent the protective oxide forming.
253MA has high strength at elevated temperatures so is often used for structural and pressure-containing applications at temperatures above about 500°C and up to about 900°C. Its strength at these temperatures is higher than that of alternatives such as Grade 310.
253MA will become sensitised in the temperature range of 425-860°C; this is not a problem for high temperature applications, but will result in reduced aqueous corrosion resistance.
Typical mechanical properties for grade 253MA stainless steels are given in table.
Mechanical properties of 253MA grade stainless steel
|
Tensile Str (MPa) min |
Yield Str 0.2% Proof (MPa) min |
Elongation (% in 50mm) min |
Hardness |
|
|
Rockwell B (HR B) max |
Brinell (HB) max |
|||
|
600 |
310 |
40 |
95 |
217 |
Typical physical properties for grade 253MA stainless steels are given in table.
TPhysical properties of 253MA grade stainless steel
|
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion (mm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat |
Electrical Resistivity (nW.m) |
|||
|
0-100°C |
0-600°C |
0-1000°C |
at 20°C |
at 1000°C |
||||
|
7800 |
200 |
17.0 |
18.5 |
19.5 |
15.0 |
29.0 |
500 |
850 |
This grade cannot be hardened by thermal treatment.
Typical applications include:
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