SUS403 Stainless Steel

in stock


We are the leading supplier Malaysia of Stainless Steel 403.

SS403 is the basic martensitic stainless steel; like most non-stainless steels it can be hardened by a quench-and-temper.


Leading Supplier of Stainless Steel 403 

Stainless Steel 403 also knowns as 
  • SUS403 / AISI Type 403 


Properties of SUS403 Stainless Steel

Grade 403 is the basic martensitic stainless steel; like most non-stainless steels it can be hardened by “quench-and-temper” heat treatment.

It contains a minimum of 11.5 per cent chromium, just sufficient to give corrosion resistance properties. It achieves maximum corrosion resistance when it has been hardened and tempered and then polished.

Grade 403 is a general-purpose grade often supplied in the hardened, but still machinable condition, for applications where high strength and moderate heat and corrosion resistance are required.

Martensitic stainless steels are optimised for high hardness, and other properties are to some degree compromised. Fabrication must be by methods that allow for poor weldability and usually the need for final heat treatment.

The corrosion resistance of the martensitic grades is lower than that of the common austenitic grades, and their useful operating temperature range is limited by their loss of ductility at sub-zero temperatures and loss of strength by over-tempering at elevated temperatures.


Category :Steel
Class : Stainless Steel
Type : Martensitic Standard
Common Names :Chromium Steel
Designations: France AFNOR Z 12 C 13M
GermanyDIN 1.4024
JapanJIS SUS 403,
United KingdomB.S. 420 S 29,
B.S. En. 56 B
United StatesAMS 5611,
AMS 5612,
ASTM A176,
ASTM A276,
ASTM A314,
ASTM A473,
ASTM A479,
ASTM A511,
ASTM A580,
FED QQ-S-763,
SAE 51403,
SAE J405 (51403), UNS S40300


Chemical Composition of SUS403 

ElementWeight %
Cr11.5 - 13.0


Mechanical Properties 

 Properties Conditions
T (°C)Treatment
Density (×1000 kg/m3)7.7 - 8.0325
Poisson’s Ratio0.27 - 0.3025
Elastic Modulus (GPa)190–21025
Tensile Strength (Mpa)48525annealed, hot finished (wire), more
Yield Strength (Mpa)275
Elongation (%)20
Reduction in Area (%)45
Hardness (HRB)88 max. 25annealed (plate, sheet, strip)


Thermal Properties 

 Properties Conditions
T (°C)Treatment
Thermal Expansion (10-6/ºC)9.90-100, more info
Thermal Conductivity (W/m-K)24.9100, more info


Technical Applications

  • Typical applications for SUS403 Stainless Steel include:
    • Bolts
    • Nuts
    • Screws
    • Bushings
    • Pump and valve parts and shafts
    • Steam and gas turbine parts
    • Petroleum fractionating towers
    • Mine ladder rungs
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