Mechanical and Chemical Compositions of Stainless Steel Grade

by Dinesh

Posted on October 6, 2017 at 8:00 PM

stainless steel

SMO 254

The stainless steel grade SMO 254 is an extremely austenitic and high-end stainless steel. This steel is made of a blend of crash toughness resistance to the chloride stress rust cracking, and crevice corrosion and pitting with the strength which is double that of that 300 series of stainless steel.

For some applications, the grade SMO 254 is reported as an affordable alternative for titanium and high nickel alloys. This stainless steel is well-known for having excellent workability. If you want to know further details regarding this SMO 254 stainless steel, you can read its chemical and mechanical properties.

Chemical Composition of SMO 254

The stainless steel grade SMO 253 includes these chemical compositions such as

  • Iron, Fe of 55.69%
  • Chromium, Cr of 20%
  • Nickel, Ni of 18%
  • Molybdenum, Mo of 6.1%
  • Nitrogen, N of 0.20%
  • Carbon, C of 0.010%

Mechanical properties of SMO 254

Here are the mechanical properties of SMO 254 as follows:

  • It has the tensile strength of 680 MPa metric and 98600 psi imperial
  • The Yield strength of SMO 254 is 300 MPa metric and 43500 psi imperial
  • The elasticity modulus of this stainless steel is 195 GPa of metric and 28300 ksi of imperial
  • It comes with the shear modulus of 75 GPa metric and 10900 ksi imperial
  • SMO 254 has Poisson’s ratio of 0.30 metric and 0.30 imperial
  • The elongation at break of this stainless steel is 50 % of metric and 50 % of imperial
  • It includes Brinell and hardness of 210 metric and 210 imperial

253 MA

The 253 MA stainless is one of the lean austenitic temperature resistant alloys that include outstanding and high strength oxidation resistance. This alloy maintains its temperature-resistant features by an advanced control of the micro-alloy additions. Additionally, the use of some metals in mixture with silicon rings better oxidation resistance of 2000°F. Carbon, nitrogen and a scattering of alkali metal and rare earth oxides gather to give sneak rupture strength similar to some nickel base alloys. An extensive range of components need increased strength at the elevated heat like heat exchangers, stack dampers, over components, kilns are the common 253 MA applications.

Chemical Composition of 253 MA

Here are the chemical compositions of 253 MP as follows:

  • 20.0-22.0 % of Cr
  • 10.0-12.0 % of Ni
  • 0.05-0.10% of C
  • 1.40-2.00 % of Si
  • 0.80 % Max of Mn
  • 0.040% Max of P
  • 0.030% Max of S
  • 0.14-0.20 % of N
  • 0.03-0.08% of Ce
  • Balance percentage of Fe

Mechanical properties of 253 MA

The mechanical properties of 253 MP are given at room temperature:

  • Specified Limits Minimum Typical Range
  • The minimum specified limits of Ultimate Tensile Strength, psi is 87,000 that include a typical range of 90,000-114,000.
  • The minimum specified limits of .2% Offset Yield Strength, psi is 45,000 with a typical range of 45,000-69,000
  • The minimum specified limits of Elongation in 2" is 40% with a typical range of 42-70
  • The minimum specified limits of Reduction of Area is 50%
  • The typical range of Hardness Rockwell B is Rb 90


The stainless steel duplex 2205 is used widely in applications which need excellent strength and corrosion resistance. The stainless steel grade S31803 has undergone many modifications resulting in the UNS S32205. It was also endorsed in 1996. It provides better resistance to corrosion. At heat range more than 300°C, all brittle micro-constituents of it undergo precipitation, as well as at temperatures less than -50°C every micro-constituent undergo the ductile-to-brittle transition;. Though, this stainless steel grade is not ideal for using at the mentioned temperatures.

Chemical Composition of DUPLEX 2205

These are the chemical composition percentages of grade duplex 2205 stainless steel.

  • Fe of <0.03%
  • C of 21-23%
  • Cr of 4.5-6.5%
  • Ni of 2.5-3.5%
  • Mo of 0.8-2.0%
  • N of <2%
  • Mn of <1%
  • Si of <0.03%
  • P of <0.02% S

Mechanical properties of DUPLEX 2205

The distinctive mechanical properties of this grade 2205 duplex stainless steel are listed below. The grade S31803 includes same mechanical properties to which of S32205.

  • The 2205 grade has min Tensile Str (MPa) of 621
  • The min yield strength 0.2% proof (MPa) of grade 2205 is 448
  • The min elongation (% in about 50mm) of this stainless steel is 25
  • The Rockwell c (HR C) and Brinell (HB) hardness of 2205 grade is 31 max and 293 max respectively


The 310 grade is an average carbon austenitic stainless steel which is used for the high-temperature applications like heat treatment device and furnace parts. It is also used the heat level roughly about 1150°C in the continuous service, as well as 1035°C in the intermittent service. The Grade 310S is a very low carbon edition of the grade 310.

Chemical Composition of SS310

The following list comes with a chemical composition of SS310.

  • Carbon - 0.08 max
  • Manganese - 2.00 max
  • Silicon - 1.50 max
  • Phosphorus - 0.045 max
  • Sulphur - 0.030 max
  • Chromium - 24.00 - 26.00
  • Nickel - 19.00 - 22.00

Mechanical properties of SS310

Here are the mechanical properties of SS310 as follow:

  • The grade 0.2 % Proof Stress MPa (min) of SS310 is 205
  • It has tensile strength MPa (min) of 520
  • The Elongation % (min) of SS310 is 40
  • The Hardness (HV) (max) of this stainless steel is 225

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