17 4 PH

17/4PH / S17400 stainless steel is a 17% chromium, 4% nickel precipitation hardening stainless steel. Classed as a martensitic grade it obtains a variety of strength and hardness properties from a relatively simple set of heat treatment processes.

This strength and toughness coupled with the high corrosion resistance and ease of fabrication has made 17/4PH a popular choice across a wide range of industries. Usually stocked in the solution annealed condition (Condition A) higher strength levels are obtained by a single or double heat treatment.

Nominal Composition

Iron

Rem

Chromium

17.0%

Nickel

4.0% max

Copper

4.0% max

Niobium and Tantalum

0.30%


Related Specifications

Type 630

UNS S17400

DIN 1.4542

ASME SA564


Key Features

  • High strength and Hardness

  • Excellent corrosion resistance

  • Good welding properties

Typical Physical Properties

Density

7.81gm/cm3

Melting Point

1440?C

Specific Heat

460 j/kg ?K

Electrical Resistivity

0.77 microhm-m

Thermal Conductivity

17.8 W/m ?K

Modulus of Elasticity (H900 condition)

200 GPa

Coefficient of Thermal Expansion

10.8 x 10-6

Fabrication Properties

Hot Workability

Good

Cold Workability

Fair (in the annealed condition)

Hot working temperature

1010-1230°C

Stress Relieving Temperature

350-430°C

Machinability

Okay

Welding

Good (post weld heat treatment may be needed)

Typical Applications
17/4PH has been used for aircraft and jet engine parts, gears and bushes, mixing screws, actuators, nuclear reactor components chemical process plant fasteners and couplings, oilfield valve stems, pump shafts, undercarriage components.

This technical information is given by John Hood & Co.without charge and the user shall employ such information at their own discretion and risk. For more detailed technical advice on temper selection, fabrication, joining, machining, physical and mechanical data please contact us as space does not permit the listing of every feature of the material.