This is a bar specification, typically available in round and hexagon. Bar. •. MECHANICAL PROPERTIES. AMS Property. Value. Proof Stress. AMS (15/5 PH VAR/ESR). Technical Manufacturing limits are as stated in the Table AMS For further Laboratory. Related Specifications. Specifications: AMS Bars, AMS Sheets and Plates, UNS S Applications: PH Stainless Steel is the ferrite-free version of PH.

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Both alloys exhibit high strength and moderate corrosion resistance. The PH alloy was designed to have greater toughness than PH, especially in the through-thickness short transverse direction.

Stainless Steel – Precipitation Hardening – AMS

This improved toughness is achieved by reduced delta ferrite content and control of inclusion size and shape. The composition and processing of PH alloy is carefully controlled to minimize its content of delta ferrite, which is present in the PH stainless steel material. Inclusion control is done by consumable electrode remelting using the electro-slag remelting ESR process.

The PH alloy is martensitic in structure in the annealed condition and is further strengthened by a relatively low temperature heat treatment which precipitates a copper containing phase in the alloy.


A wide range of properties can be produced by this one step heat treatment. The latter precipitation hardening alloys generally require more steps to complete heat treatment.

15-5PH Stainless Steel (AMS 5659/ AMS 5862)

The PH alloy is generally better-suited for plate applications than are the semi austenitic alloys. The PH stainless steel alloy is martensitic in structure in the annealed condition and is further strengthened by a low temperature treatment which precipitates a copper containing phase in the alloy.

It is a through-hardening alloy, which allows it to be used in parts with large cross specitication, where yield strengths in excess of ksi. Good transverse toughness properties are achieved by tight chemical composition control to prevent the formation of delta phaselow carbon content to minimize grain boundary precipitationand double vacuum melting to reduce alloy segregation.

Since the rate of cooling from the solution temperature is not critical, large cross sections can be air-cooled.

This alloy is produced by a primary vacuum induction melt process VIMfollowed by a consumable vacuum arc remelting VAR step.

Typical uses are aircraft parts, rocket engine mounts, nuclear reactor parts, landing gear components, high performance shafts, and petrochemical parts that require high strength combined with good resistance to stress corrosion. Physical properties Melting Range: Air cool spcification oil quench to below 60F 15C to ensure complete transformation to martensite.


Aging is normally carried out from to 1,F to Cdepending upon the desired final properties. Heat treatment is usually performed in air.

Heat treatment of brazed components maybe done in inert atmospheres. Reducing atmospheres should not be used because of the potential for nitrogen contamination. For optimum properties, forging temperature should not exceed 1,F 1,C. After forging, parts should be cooled to room temperature, then solution treated prior to aging.

PH AMS CF COND A /8 RD Stainless Steel Bar/rod | TW Metals

The alloy can be cold formed in the annealed condition, utilizing conventional cold forming techniques. In the annealed condition, use machine speeds 20 to 30 percent lower than those used on stainless steel. These include plasma arc, electron beam, gas metal arc, and shielded metal arc processes.

Helium is the preferred shielding gas.