253 MA Stainless Overview
Stainless steel 253 MA is a lean austenitic heat resistant alloy with high strength and outstanding oxidation resistance. 253 MA maintains its heat resistant properties by advanced control of micro alloy additions. The use of rare earth metals in combination with silicon gives superior oxidation resistance up to 2000 F degree. Nitrogen, carbon and a dispersion of rare earth and alkali metal oxides combine to provide creep rupture strength comparable to the nickel base alloys. A wide variety of components requiring high strength at elevated temperatures such as heat exchangers, kilns, stack dampers and oven components are common applications for 253 MA.
Chemical Composition, %
|
Cr |
Ni |
C |
Si |
Mn |
|
20.0-22.0 |
10.0-12.0 |
0.05-0.10 |
1.40-2.00 |
0.80 Max |
|
P |
S |
N |
Ce |
Fe |
|
0.040 Max |
0.030 Max |
0.14-0.20 |
0.03-0.08 |
Balance |
Product forms:
Round bar: diameter 1mm to 500mm
Coil: thickness 0.01mm-40mm,
Width:600-1500mm
finish 2B, BA, No.1, No.4+PVC
Plate: thickness 0.1mm to 100mm
Width: 10mm to 2500mm
Length: We can supply any lenth based on the customer's requirement.
Tube: OD: 3-1500mm, with wall thickness ranging from 0.5-55 mm.
applications:
•Burners, Boiler Nozzles
•Petrochemical and refinery tube hangers
•Heat exchangers
•Expansion bellow
•Stack dampers
Fabrication and Welding with Stainless 253 MA
Stainless steel 253 MA is readily fabricated by standard commercial procedures. In comparison to carbon steel, stainless steels are tougher and tend to work harden rapidly. However, with positive feeds and slow speeds combined with abundant cutting fluid this alloys tendency to work harden may be minimized.
Stainless 253 MA can be welded using conventional welding processes. Filler metal should be of similar composition for maximum weld integrity and properties.
