Stainless steel · ASTM A276
440C
Overview
440C is a stainless steel grade (ASTM A276) used where corrosion resistance and cleanability matter.
Typical supply: Sheet, plate, bar, tube, wire
Mechanical Properties
Young's modulus E200 GPa
Shear modulus G78.1 GPa
Yield / proof Re450 MPa
Ultimate Rm760 MPa
Poisson's ratio ν0.28
Hardness240 HB
Thermal Properties
Not published for this grade.
Physical Properties
Density ρ8e+3 kg/m³
Specific strength Sy/ρ5.88e+4 Pa·m³/kg
Specific stiffness E/ρ2.61e+7 Pa·m³/kg
Typical supply: Sheet, plate, bar, tube, wire
Density typically ~7800–8000 kg/m³ depending on alloy family.
Applications
- Corrosive service equipment
- Food, pharma, and hygienic plant
- Architectural and marine fittings
- Pressure parts (code-dependent)
Advantages
- Inherent corrosion resistance without thick coatings
- Hygienic finish options for process plant
- Good toughness over a wide temperature range (austenitic)
Limitations
- Higher cost than carbon structural steel
- Chloride stress-corrosion risk for some grades/environments
- Lower thermal conductivity than carbon steel or aluminum
Standards
- ASTM A276
Equivalent Materials
Electrical Properties
Not published for this grade.
Chemical Composition
Not published for this grade.
Machinability
Machinability index: 30 (AISI 1212 ≈ 100)
Work-hardening austenitics need sharp tools, rigid setups, and adequate coolant.
Cost
Relative cost band: high
Premium vs carbon steel; Mo-bearing grades cost more than 304 family.
Corrosion
Class: good
Select grade by environment (chloride, acid, temperature); surface finish matters.
- Indoor / atmosphericexcellent
- Fresh watergood
- Marine splashfair
For allowance / life screening, open Corrosion Allowance.