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Review Plat 253MA Sandvick

Posted by Diary Rabu, 09 Maret 2016 0 komentar

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253 MA Sandvik is an austenitic chromium-nickel steel alloyed with nitrogen and rare earth metals. The grade is characterized by:

High creep strength
Very good resistance to isothermal and, particularly, cyclic oxidation
Good structural stability at high temperatures
Good weldability
Maximum operating temperature is approx. 1150°C (2100°F)

The high creep strength of Sandvik 253 MA, coupled with its excellent oxidation resistance and its good resistance to carburization in constantly carburizing gas, makes it a very suitable material for end uses in which 18/8 steels lack the necessary resistance to oxidation and carburization.

Sandvik 253 MA is often preferred instead of stainless chromium steels which have insufficient creep strength and structural stability. Furthermore, Sandvik 253 MA can very well take the place of higher alloyed materials such as 25Cr/20Ni steels and Alloy 800H, or even Alloy 600 in certain cases.

Standards

UNS: S30815
EN Number: 1.4835
W.Nr.: (1.4893)*/(1.4828 mod.)*
SS: 2368*
Product standards
ASTM A213, A312
EN 10297-2
SS 14 23 68*
* Obsolete. Replaced by EN.

Approvals
Approved for use in ASME Boiler and Pressure Vessel Code, Section I, III and VIII, Div. 1 (SA-182, SA-213, SA-240, SA-249 SA-312 and SA-479)

C	Si	Mn	P	S	Cr	Ni	N	Ce*
0.08	1.6	≤0.8	≤0.040	≤0.030	21	11	0.17	0.05

* To cerium should be added the quantity of other rare earth metals, since the the additive takes the form of misch metal containing about 50% Ce.

Application
Sandvik 253 MA has come to be used extensively in the metallurgical, petrochemical and power industries. Typical applications are:

Tubes in waste heat recovery systems in the metallurgical industry, e.g. recuperators
Tubes in heat treatment furnaces, e.g. radiation tubes, thermocouple protection tubes, burner components, furnace rollers
Tubes for injection of pulverized coal in blast furnaces
Tubing for fluidized-bed combustion plants
Furnace tubes for mud incineration plants
Tubes for carbon black process gas coolers/air heaters
Tubes for the glass and cement industries
Styrene reactor tubes
EDC cracking tubes
Convection tubes in ethylene cracking
Air preheater tubes in sulphuric acid gas converters
Muffle tubes in continuous wire annealing furnaces