SS DIN 1.4835 Pipes & Tubes Stainless Steel TP 253MA Seamless Tubes

SS DIN 1.4835 Pipes & Tubes Stainless Steel TP 253MA Seamless Tubes

SS DIN 1.4835 Pipes & Tubes Stainless Steel TP 253MA Seamless Tubes 1.4835 (UNS S30815 – 253MA®* – SS2368). The steel grade 1.4835 ( also called UNS S30815, 253MA®* and SS2368) is an austenitic stainless high temperature steel with good resistance to oxidation. The steel has been designed to...
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SS DIN 1.4835 Pipes & Tubes Stainless Steel TP 253MA Seamless Tubes

1.4835 (UNS S30815 – 253MA®* – SS2368).

The steel grade 1.4835 ( also called UNS S30815, 253MA®* and SS2368) is an austenitic stainless high temperature steel with good resistance to oxidation. The steel has been designed to be used at temperatures over 550°C, the most suitable temperature range is 850-1100°C. The steel suits for production of details with good resistance to temperature corrosion and relatively high strength at elevated temperatures. It also has good creep strength properties. 1.4835 is not magnetic but can be slightly magnetic after cold working or welding.

Typical application areas for 1.4835:

Ovens
Construction
Building
As details at high temperature

Good formability and weldability:

1.4835 has a good weldability and can be welded with shielded metal arc welding, gas tungsten arc welding, plasma arc welding and submerged-arc welding. You shall use low heat input and use filler metals of type EN 1.4835 when you weld. The steel can be both cold and hot formed but it can only be hardened by cold working. The steel has high hardness and at machining you need to follow cutting recommendations.


 Composition ranges for 253MA grade stainless steel
253MA 
C
Mn
Si
P
S
Cr
Ni
N
Ce
Min
0.05
-
1.1
-
-
20
10
0.14
0.03
Max
0.1
0.8
2.0
0.04
0.03
22
12
0.2
0.08
Mechanical properties of 253MA grade stainless steel
                                      Tensile
                                             Yield
                            Elongation %
                                  Hardness
         HRB
                 HB
600 min 
300 min
40 min
           95max
            217max
Physical properties of 253MA grade stainless steel
Density (kg/m3)
Elastic Modulus (GPa)
               Mean Coefficient of                              Thermal         Expansion 
Thermal Conductivity 
Specific Heat
0-100°C (J/kg.K)
Electrical Resistivity (nW.m)
0-100°C
0-600°C
0-1000°C
at 20°C
at 1000°C
7800
200
17
18.5
19.5
15
     29
   500
  850

Applications of 253MA grade stainless steel:

Typical applications include:
Furnace components including burners, retorts, conveyor belts, fans, jigs and baskets, rollers, walking beams, radiant tubes, electric heater elements, refractory anchors, hoods, flues, grates, expansion bellows.
Petrochemical and refinery tube hangers.

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.

Heat Resistance.

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.

Heat Treatment.

Solution Treatment (Annealing) - Heat to 1050-1150°C and cool rapidly. It is recommended that the material be solution treated after 10-20% cold work to achieve maximum creep strength in service.
This grade cannot be hardened by thermal treatment.

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