TMS 17-4 PH

TMS 17-4 PH is a martensitic precipitation- hardening stainless steel that provides an outstanding combination of high strength, good corrosion resistance, good mechanical properties at temperatures up to 600°F (316°C), good toughness in both base metal and welds, and short time, low-temperature heat treatments that minimize warpage and scaling. This versatile material is widely used in the aerospace,chemical, petrochemical, food processing, paper and general metalworking industries.



Heat treatment

As supplied from the mill in Condition A, TMS 17-4 PH stainless steel can be heat treated at a variety of temperatures to develop a wide range of properties. Eight standard heat treatments
have been developed.


Mechanical properties


Typical Physical Properties


Corrosion resistance

Precipitation hardening stainless steels have moderate to good corrosion resistance in a range of environments. They have a better combination of strength and corrosion resistance than when compared with the heat treatable 400 series martensitic alloys. Corrosion resistance is similar to that found in grade 304 stainless steel. In warm chloride environments, TMS 17-4 PH is susceptible to pitting and crevice corrosion.When aged at 550°C or higher, TMS 17-4 PH is highly resistant to stresscorrosion cracking. Betterstresscorrosion cracking resistance comeswith higher ageing temperatures. Corrosion resistance is low in the solution treated (annealed) condition and should not be used before heat treatment.

Heat resistance

TMS 17-4 PH has good oxidation resistance. In order to avoid reduction in mechanical properties, it should not be used over its precipitation hardening temperature. Prolonged exposure to
370-480°C should be avoided if ambient temperature toughnessiscritical.


In the annealed condition, TMS 17-4 PH has good machinability, similar to that of 304 stainless steel. After hardening heat treatment, machining is difficult but possible. Carbide or High speed steel tools are normally used with standard lubrication.When strict tolerance limits are required, the dimensionalchanges due to heat treatment must be taken into account.

Cold working

Cold forming such as rolling, bending and hydro forming can be performed on TMS 17-4 PH but onlyin the fully annealed condition.Aftercold working improved byre-ageing at the precipitation hardening temperature.

Hot working

Hot working of TMS 17-4 PH should be performed at 950°-1200°C. After hot working, full heat treatment is required. This involves annealing and cooling to room temperature or lower. Then the component needsto be precipitation hardened to achieve the required mechanical properties.


The precipitation hardening class of stainless steels is generally considered to be weldable by the common fusion and resistance techniques. Special consideration is required to achieve optimum mechanical properties byconsidering the best heat treated conditionsin which to weld and which heat treatments should follow welding. This particular alloy is the most common of the class and is generallyconsidered to have the best weldability.


Round 6 mm until round 500 mm
Flatcut from block or forged.
Other dimensions/ forms on demand.

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