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17/4PH

17/4PH Stockist Range

Product FormRange FromRange To
17/4PH Plate6.35mm76.2mm
17/4PH Round Bar6.35mm640mm
17/4PH Square Bar70x70mm
17/4PH Flat Bar180x70mm
17/4PH Sheet4.0mm

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17/4PH is a high-strength, stainless steel made up of chromium, nickel, copper and niobium. With precipitation-hardening and martensitic qualities, it is both tough and corrosion-resistant. The alloy maintains high tensile strength and hardness up to 316°C and excellent oxidation resistance up to 593°C. Alloy 17-4 also has good creep-stress rupture properties up to 482°C.

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Beneficial Properties

  • Flexibility Good workability, weldability and easy to machine
  • Corrosion-Resistant High resistance to certain corrosive environments and elements, fatigue and wear
  • Durability Strong performance, toughness and resilience
  • Magnetic Permeability A high measure of magnetic permeability

Markets & Applications

  • Aerospace manufacture such as: undercarriage components and fasteners, rocket fittings and other structural parts
  • Paper mill equipment
  • Nuclear waste casks and production
  • Mechanical components such as: springs, screws, bolts, gears
  • Chemical processing plants and oil and gas production
  • Offshore and marine mechanical components, foils and helicopter deck platforms

17/4PH Mechanical Properties

Yield StrengthKSI (MPa)≥ 105 (725)
Tensile StrengthKSI (MPa)≥ 124 (860)
HardnessHB≥255
Elongation%≥16
Impact Charpy-V -46°CJ≥41

17/4PH Technical Specifications

ASTMUNSWerkstoffAISI
A564S174001.4542630 Type 630

17/4PH Chemistry

NickelNi3.0-5.0
IronFeBalance
CarbonC0.7 Max
SiliconSi1.0 Max
ManganeseMn1.00 Max
SulphurS0.030 Max
PhosphorusP0.040 Max
ChromiumCr15.00-17.50 Max
CopperCu3.0-5.0
NiobiumNb0.15-0.45

17/4PH Physical Properties

Densityg/cm³7.82
Melting Point°F2560-2625
°C1404-1440
Modulus of Elasticity at 20°CMPa196000
Thermal Conductivity at 20°CW/m.K18.4
Thermal Expansionx10-6/K10.8
Electrical Resistivity10-6Ω.m0.08
Poisson’s ratio0.272

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