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303 stainless steel
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303 stainless steel

303 stainless steel

303 stainless steelis austenite stainless steel respectively containing sulfur and selenium free cutting stainless steel wear-resistant acid. higher free cutting and surface finish for the occasion.303 stainless is used for the condition requiring easy cutting and high surface finish. In order to improve 303 stainless steel performance, we can add no more than 0.60 ﹪ of molybdenum in steel and it is resistant to erosion. 303 stainless steel application: Petroleum, electronics, chemical industry, medicine, textile, food, machinery, building, nuclear power, aerospace, military industry and other industries.

303 stainless steel chemical composition:

Grade Chemical Composition(%)
303 C Si Mn P S Cr Ni Mo
≤0.15 ≤1.00 ≤2.00 ≤0.20 ≥0.15 17.00-19.00 8.00-10.00 ≤0.06

303 stainless steel mechanical properties:

Mechanical properties
Grade Yield Strength σ0.2 (MPa) Tensile Strength
σb (MPa)
Hardness Area Reduction ψ (%) Elongation
δ5 (%)
303 ≥205 ≥520 ≤187HB;≤90HRB;≤200HV ≥50 ≥40

303 stainless steel physical properties

Coefficient of
Thermal Expansion (min/in)-°F
Electrical Resistivity mW-in Thermal Conductivity  BTU/hr-ft-°F Melting
at 68 °F at 68 – 212°F at 68 – 932°F at 68 – 1450°F at 68°F at 212°F at 392°F at 752°F at 1112°F at 1472°F at 68 – 212°F  
0.29 9.2 10.4 10.9 28.3 30.7 33.8 39.4 43.7 47.6 113.2 2552°

303 stainless steel Corrosion Resistance
Sulphur additions to the composition act as initiation sites for pitting corrosion. This decreases the corrosion resistance of 303 stainless steel to less than that for 304. However. corrosion resistance remains good in mild environments.
In chloride containing environments over 600C, 303 stainless steel is subject to pitting and crevice corrosion. Grade 303 stainless is not suitable for use in marine environments.

303 stainless steel Heat Treatment
303 stainless steel cannot be hardened by heat treatment.
Solution treatment or annealing can be done by rapid cooling after heating to 1010-11200C.

Shanghai Katalor enterprises Co., Ltd is the professional 303 stainless steel supplier. We can provide the high quality 303 stainless steel plate, pipe, coil, square hollow section and rectangle hollow section, bar with the most competitive price for you. If you have any need for 303 stainless steel, please contact with us!

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