18-8 Stainless Steel

18-8 Stainless Steel

Table of contents

18-8 Stainless Steel Properties Which make it Suitable for Marine Use

  • Corrosion Resistance
  • Magnetic Characteristics
  • Hardenability

18/8 Stainless Steel (AISI 304) Heat Resistance and Machinability

Heat Resistance Oxidation Resistance (Intermittent Service) Oxidation Resistance (Continuous Service) Corrosion Resistance in Water
Up to 870°C Up to 925°C at 425-860°C
Machinability
Cutting Edges
Chip Breakers
Thermal Conductivity
Coolants and Lubricants

18-8 Stainless Steel Composition

Carbon
0.08%
Manganese
2.00%
Silicon
1.00%
Phosphorus
0.045%
Sulfur
0.03%
Chromium
18%
Nickel
8%

American Standard of 18-8 Stainless Steel Material

ASTM Standard Product Form
ASTM A312 Pipe
ASTM A213 Tube
ASTM A554 Square Tube
ASTM A240 Sheet, Coil, Strips & Plate
ASTM F593 Grade 18-8 Nut Bolts and Fasteners
ASTM A403 Pipe Fittings
ASTM A182 Flanges
ASTM A276/ A479 Bars and Rod

Stainless Steel 18-8 Yield Strength

Yield Strength 205 MPa

Chromium Steel 18-8 Heat Treatment

Heat Treatment 1010- 1120°C

18-8 Stainless Steel Properties

18-8 Stainless Steel Properties

  • 18-8 or AISI 304 is Non-magnetic grade of Stainless Steel
  • It has maximum carbon content of 0.08%
  • Can be hardened by cold working
  • It can not be hardened by heat treatment
  • Contains 18% chromium (Cr) and 8% nickel (Ni)
Property Value
Comprehensive Strength 210 MPa
Tensile Strength 520 – 720 MPa
Elongation 45 min%
Proof Stress 210 min MPa

Stainless Steel Type 18-8 Fabrication

  • Dedicated tools for stainless steel
  • Tooling and work surfaces
  • Cross-contamination
  • Corroded metals
  • Prevent discoloration

18-8 Stainless Steel Corrosion Resistance

Corrosion Resistance 60°C

SS 18-8 Advantages & Disadvantages

SS 18-8 Advantages & Disadvantages

Passivated 18-8 Stainless Steel Physical Properties

Property Value
Density 8.00 g/cm³
Modulus of elasticity 193 GPa
Thermal conductivity 16.2 w/mk
Melting point 1450 °C
Thermal expansion 17.2 *10^-6 /K
Electrical resistivity 0.72 *10^-6 Ω .m

18-8 Stainless Steel Equivalent Material

US European Union ISO Japan China
Standard Type Standard Grade (Steel Number) Standard Grade (ISO Number) Standard Grade Standard Grade
AISI SAE;
ASTM A276 / A276M;
ASTM A240 / A240M;		 304
(UNS S30400)		 EN 10088-1; EN 10088-2; EN 10088-3 X5CrNi18-10 (1.4301) ISO 15510 X5CrNi18-10 JIS G4303; JIS G4304; JIS G4305; SUS304 GB/T 20878;
GB/T 1220;
GB/T 3280		 0Cr18Ni9;
06Cr19Ni10 (New designation)
304L
(UNS S30403)		 X2CrNi18-9 (1.4307);
X2CrNi19-11 (1.4306)		 X2CrNi19-11 (4306-304-03-I) SUS304L 00Cr19Ni10;
022Cr19Ni10 (New name)

304 18-8 Stainless Steel Applications

  • Construction materials
  • Food and chemical
  • Cookware
  • Kitchen appliances
  • Architectural elements
  • Automotive parts
  • Medical and dental equipment

Electrical properties of 18-8 stainless steel

Electrical Resistivity Magenetic permeability
0.000116 ohm-cm Max 1.02

SS 304 and 18-8 Stainless Steel Magnetic Properties

Magnetic Properties Non-magnetic
18-8 Stainless Steel (UNS S30400) Rockwell Hardness and Shear Strength
Hardness (Rockwell B) Shear Strength
70–85 HRB 386 MPa (56,000 psi)
18-8 Stainless Steel (18% Chromium and 8% nickel) Thermal Conductivity
Thermal Conductivity 16.2 W/m·K at 100 °C