LayrrSteel 17-4 - 17-4 PH
CAS No. : UNSS17400

Product Intelligence

When 316L isn't strong enough, and 4340 isn't corrosion-resistant enough, engineers turn to 17-4 PH. It is the single most versatile alloy in the additive manufacturing ecosystem.

Layrr Materials 17-4 PH is a gas-atomised powder designed to deliver this duality without compromise. We supply a feedstock with tightly controlled Niobium and Copper content—the critical elements that drive the precipitation hardening reaction. By ensuring chemical homogeneity in every particle, we guarantee that your final parts will respond predictably to heat treatment, achieving the exact "H-condition" (hardness) your specification requires.

Material Behaviour & Microstructure

The "PH" stands for Precipitation Hardening. The magic of this alloy happens after the print.

• Martensitic Matrix: As printed, the structure is primarily low-carbon martensite, providing a solid baseline of strength.

• The Copper Effect: During the aging process, nanometric Copper (Cu) precipitates form within the matrix. These precipitates pin dislocations, driving the hardness up significantly (up to 44 HRC).

• Corrosion Shield: Despite its high strength, it maintains corrosion resistance comparable to 304 Stainless Steel in most environments.

Processing Advantage: The Layrr Standard

17-4 PH is famous for its "printability," but powder quality dictates the fatigue life.

• Argon Atomization: We use high-purity argon atomisation to minimize oxygen pickup and nitrogen absorption, which can inhibit the proper martensitic transformation.

• High Flow: Excellent hall flow rates ensure smooth recoating, critical for maintaining layer thickness consistency in fast-production LPBF environments.

• Weldability: The low carbon content makes it highly weldable and resistant to cracking during the rapid solidification of laser melting.

Critical Applications

This is the "General Purpose" high-strength alloy, found in almost every industrial sector:

• Aerospace: Structural brackets, fittings, and fasteners requiring high specific strength.

• Oil & Gas: Valve stems, pump shafts, and gate valves exposed to corrosive hydrocarbons.

• Medical Instruments: Surgical tools that require high hardness to maintain a sharp edge while withstanding sterilization.

• Industrial Manufacturing: End-of-arm tooling and grippers for robotics.

Layrr Technical Note:

Unlike 316L, 17-4 PH properties are highly tunable. The material can be heat-treated to various conditions (e.g., H900 for max strength, H1150 for better toughness). Note that as-printed parts often contain a fraction of retained austenite; a Solution Anneal + Aging cycle is required to homogenize the structure and unlock peak performance.

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