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Stainless Steel - Grade 630/1.4542

Description

Stainless Steel Grade 630/1.4542, also known as AISI 630 or 17-4PH, is a precipitation-hardening martensitic stainless steel. It is characterized by its high strength, excellent corrosion resistance, and good mechanical properties, making it suitable for various demanding applications.

Chemical Composition

The standard chemical composition of Grade 630 is as follows:

Element Percentage (%)
Carbon (C) 0.00 - 0.07
Manganese (Mn) 0.00 - 1.00
Phosphorus (P) 0.00 - 0.04
Sulfur (S) 0.00 - 0.03
Silicon (Si) 0.00 - 1.00
Chromium (Cr) 20.00 - 23.00
Nickel (Ni) 3.00 - 5.00
Niobium (Nb) 0.15 - 0.45
Copper (Cu) 3.00 - 5.00

Mechanical Properties

The mechanical properties of Grade 630 vary based on the heat treatment condition:

Condition Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness (Rockwell C)
Solution Treated 1105 (typical) 1000 (typical) 15 (typical) 38 max
Condition H900 1310 (min) 1170 (min) 10 (min) 40 min
Condition H1150 930 (min) 724 (min) 16 (min) 28 min

Thermal & Physical Properties

  • Density: 7.75 g/cm³
  • Modulus of Elasticity: 196 GPa
  • Thermal Conductivity: 18.4 W/m•K
  • Thermal Expansion: 10.8 x 10⁻⁶ /°C
  • Electrical Resistivity:0.8 x 10⁻⁶ Ω•m

    • Other Designations

  • DIN Number:1.4542
  • UNS: S17400
  • Other Names : 17-4PH

    • Fabrication and Heat Treatment

  • Heat Treatment:
  • Solution Treatment: Heat to 1040°C for 0.5 hours, then air cool.
  • Aging: Age-hardened at low temperatures to achieve desired mechanical properties.
  • Welding: Can be welded using conventional methods without pre-heating. Post-weld heat treatment can be performed to restore mechanical properties.
  • Machining: Machinability is similar to that of grade 304 stainless steels in the solution-treated condition.

    • Applications

    Grade 630/1.4542 is widely used in various industries, including:

  • Aerospace
  • Marine
  • Paper and Pulp
  • Energy
  • Food Processing

    • Typical applications include:

  • Heavy-duty machine components
  • Bushings
  • Turbine blades
  • Couplings
  • Drive shafts
  • Nuts and screws

    • Supplied Forms

    Stainless Steel Grade 630/1.4542 is commonly supplied in various forms, including:

  • Round bars
  • Sheets
  • Flat bars
  • Cold-rolled strips

    • Features

  • High strength and hardness
  • Excellent corrosion resistance comparable to 304 stainless steel
  • Good ductility in heat-treated conditions

    • This datasheet provides a comprehensive overview of Stainless Steel Grade 630, highlighting its properties, applications, and fabrication methods.

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