Stainless Steel 303 Material Property Data Sheet

Do you need custom fasteners created with Stainless Steel 303? Since our inception, Elgin Fastener Group has met every challenge of providing Quality, Timely, Cost-effective solutions for specialty fastener applications. Every product is built to your specifications, using your prints if necessary.

Below are the technical specifications of the Stainless Steel 303 Bar Stock we have available to meet your needs.

AISI Type 303 Stainless Steel, annealed bar, tested at RT

Subcategory: Heat Resisting; Metal; Stainless Steel; T 300 Series Stainless Steel

Close Analogs: AISI Type 303 Se

Key Words: T303, T 303, 303SS, 303 SS, AFNOR Z 10 CNF 18.09 (Fr), UNI X 10 CrNiS 18 09, SUS 303, SS14 2346 (Sweden), B.S. 303 S 21, UNS S30300, AMS 5640 (1), ASME SA194, ASME SA320, ASTM A194, ASTM A314, ASTM A320, ASTM A320, ASTM A473, ASTM A581, ASTM A582, MIL SPEC MIL-S-862, SAE J405 (30303), DIN 1.4305, X12CrNiS188, EN 58M, austenitic, ISO 683/13 17, 18-8

Component Wt. %
C Max 0.15
Cr 18
Fe 69
Mn Max 2
Mo Max 0.6
Ni 9
P Max 0.2
S Min 0.15
Si Max 1

Physical Properties Metric English Comments
Density 8 g/cc 0.289 lb/in³
Mechanical Properties
Hardness, Brinell 160 160
Hardness, Knoop 180 180 Converted from Brinell hardness.
Hardness, Rockwell B 83 83 Converted from Brinell hardness.
Hardness, Vickers 167 167 Converted from Brinell hardness.
Tensile Strength, Ultimate 620 MPa 89900 psi
Tensile Strength, Yield 240 MPa 34800 psi at 0.2% offset
Elongation at Break 50 % 50 % in 50 mm
Modulus of Elasticity 193 GPa 28000 ksi tension
Poisson’s Ratio 0.25 0.25 Calculated
Fatigue Strength 240 MPa 34800 psi annealed
Fatigue Strength 330 MPa 47900 psi 25% hardened
Shear Modulus 77.2 GPa 11200 ksi
Electrical Properties
Electrical Resistivity 7.2e-005 ohm-cm 7.2e-005 ohm-cm
Magnetic Permeability 1.008 1.008 at RT
Thermal Properties
CTE, linear 20°C 17.2 µm/m-°C 9.56 µin/in-°F from from 0-100°C
CTE, linear 250°C 17.8 µm/m-°C 9.89 µin/in-°F at 0-315°C (32-600°F)
CTE, linear 500°C 18.4 µm/m-°C 10.2 µin/in-°F at 0-540°C, 18.7 µm/m-C at 0-650°C
Heat Capacity 0.5 J/g-°C 0.12 BTU/lb-°F from 0-100°C (32-212°F)
Thermal Conductivity 16.2 W/m-K 112 BTU-in/hr-ft²-°F at 100°C (212°F), 21.5 W/m-K at 500°C (930°F)
Melting Point 1400 – 1420 °C 2550 – 2590 °F
Solidus 1400 °C 2550 °F
Liquidus 1420 °C 2590 °F

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