DIN 1.4305 Alloy Steel Bar


DIN 1.4305 is austenitic free-cutting stainless, wear-resistant and burning-resistant steel. In order to improve the performance of the steel, no more than 0.60% molybdenum can be added to the steel to resist ablation, and the product has good machinability and burning resistance. , Corrosion resistance. Mechanical properties of 303 stainless steel after annealing and stress relief, the tensile strength is 515MPa, the yield strength is 205MPa, and the elongation is 40%. Standard hardness HRB 90-100, HRC 20-25. For parts that require excellent cutting performance and good surface finish, it is better to use this type of steel.DIN 1.4305 stainless steel (X8CrNiS18-9 material) is an European standard austenitic corrosion resisting material with sulfur added to improve cutting performance, but its corrosion resistance is limited in acid and chloride media, when used in these media, pitting or cavity corrosion can occur. X8CrNiS18-9 steel forms short chips during cutting and is therefore particularly suitable for machining. Due to material properties, this stainless steel is also known as free-cutting steel. 

Stainless steel type 1.4305 is popularly known as grade 303 stainless steel. Grade 303 is the most readily machineable of all the austenitic grades of stainless steel. The machineable nature of grade 303 is due to the presence of Sulphur in the steel composition. Whilst the Sulphur improves machining, it also causes a decrease in the corrosion resistance and a slight lowering of the toughness. The corrosion resistance of type 303 is lower than that for 304. The toughness is still excellent as with other austenitic grades.

Property data given in this document is typical for bar products covered by EN 10088-3:2005. ASTM, or other standards may cover products sold. It is reasonable to expect specifications in these standards to be similar but not necessarily identical to those given in this datasheet.

Chemical Composition:

C, ≤Si, ≤Mn, ≤P, ≤SCrNiN, ≤Cu, ≤

Physical Properties:


  • 1 g/cm3 = 1 kg/dm3 = 1000 kg/m3;
  • 1 μΩ·m = 1 Ω·mm²/m
  • 1 GPa = 1 kN/mm2
Density, g/cm3 (Kg/m3)7.9 (7900)
Specific heat capacity, J/(Kg·K)500 (20 ℃)
Electrical resistivity, μΩ·m0,73 (20 ℃)
Modulus of elasticity, GPa210 (20 ℃)
194 (100 ℃)
186 (200 ℃)
179 (300 ℃)
172 (400 ℃)
165 (500 ℃)
Thermal conductivity, (W/m·K)15,0 (20 ℃)
Mean coefficient of thermal expansion, (10-6/K)16,0 (20-100 ℃)
16,5 (20-200 ℃)
17,0 (20-300 ℃)
17,5 (20-400 ℃)
18,0 (20-500 ℃)

Mechanical Properties:


Diameter (d) or Thickness (t) in mmHardness (HB), ≤0.2% yield strength (MPa), ≥1% Proof strength (MPa), ≥Tensile strength (MPa)Elongation, % (Longitudinal)Resistance to intergranular corrosion


Heat-ThreatmentThickness (mm), ≤0,2 % yield strength (Mpa), ≥, (Transverse)1 % yield strength (Mpa), ≥ (Transverse)Tensile strength (MPa)Elongation (%), ≥, (Transverse)Resistance to intergranular corrosion
Hot rolled plate75190230500-70035No