17-4PH Precipitation-Hardening Stainless Steel

Material Profile: 17-4PH Precipitation-Hardening Stainless Steel for Binder Jetting

Binder Jetting Engineering Material Technical Report Series

Compiled from manufacturer technical datasheets and peer-reviewed literature

Abstract—17-4PH (UNS S17400) is the dominant precipitation-hardening martensitic stainless steel for metal binder jetting and is the flagship material on the Desktop Metal Shop System. It combines the corrosion resistance of austenitic 304/316 with the strength of low-alloy steels via 3–5 wt% copper precipitation hardening. Binder-jet 17-4PH is sintered to ≥ 96 % theoretical density and routinely heat-treated by the H900 cycle (solution at 1040 °C, age at 482 °C / 1 h) to achieve UTS ≈ 1310 MPa, yield ≈ 1170 MPa, and elongation ≥ 6 %. Independent test data from Desktop Metal show binder-jet 17-4PH meets or exceeds MPIF Standard 35-MIM properties for both as-sintered and aged conditions. The Shop System produces 17-4PH parts at production rates up to hundreds of green parts per build (350 × 220 × 200 mm envelope at 16L) at a per-part cost typically 5–10× lower than laser powder-bed fusion.

Index Terms—additive manufacturing, binder jetting, 17-4PH, precipitation hardening, stainless steel, Desktop Metal Shop System, UNS S17400.

I.  MATERIAL IDENTIFICATION

This section establishes the canonical names and commercial designations under which the material is supplied.

A.  Designation

Trade names: Desktop Metal 17-4PH (Shop / Production / X-Series); ExOne 17-4PH; Digital Metal DM 17-4PH; HP Metal Jet 17-4PH; ASTM A564 Grade 630 (wrought equivalent). MIM-equivalent specification: MPIF Standard 35-MIM, MIM-17-4PH-H900.

B.  Full Chemical Name

Precipitation-hardening martensitic stainless steel. Composition (wt%): Cr 15.0–17.5, Ni 3.0–5.0, Cu 3.0–5.0, Mn ≤ 1.0, Si ≤ 1.0, Nb+Ta 0.15–0.45, C ≤ 0.07, P ≤ 0.04, S ≤ 0.03, Fe — balance. Strengthening mechanism: coherent ε-Cu precipitates form during the 482 °C aging step, increasing yield strength by ~600 MPa over the solution-annealed condition.

C.  Aliases and Alternative Designations

II.  COMPOSITION AND MOLECULAR STRUCTURE

A.  Empirical Chemical Formula

Fe(balance) — Cr(15.0–17.5%) — Ni(3.0–5.0%) — Cu(3.0–5.0%) — Mn(≤1%) — Si(≤1%) — Nb+Ta(0.15–0.45%) — C(≤0.07%). Strengthening phase: coherent ε-Cu precipitates (~3 nm diameter) in BCC α'-Fe martensite matrix.

Fig. 1.  Repeating unit / structural schematic of the polymer matrix.

Fig. 2.  Schematic of the single-phase polymer (no reinforcement).

B.  Composition Breakdown

TABLE I
 COMPOSITIONAL BREAKDOWN OF 17-4PH SS (DESKTOP METAL SHOP SYSTEM) (TYPICAL / PER SUPPLIER DATASHEET)

III.  MECHANICAL PROPERTIES — XY BUILD DIRECTION (HORIZONTAL)

In the XY orientation the tensile load is applied parallel to the powder-bed plane. Binder-jetted (BJ) parts in the as-sintered state generally show modest in-plane vs build-axis anisotropy because sintering occurs near the solidus and re-distributes the porosity left by the binder-removal step. For metal BJ, post-sintering treatments (HIP, solution-anneal, age) are commonly applied to bring properties to wrought-equivalent and to eliminate residual closed porosity.

TABLE II
 MECHANICAL PROPERTIES — XY ORIENTATION (17-4PH SS (DESKTOP METAL SHOP SYSTEM))

IV.  MECHANICAL PROPERTIES — Z BUILD DIRECTION (VERTICAL)

In the Z orientation the tensile load is applied perpendicular to the printed layers. Binder-jet metal parts typically exhibit Z-direction strength within 5–15 % of XY in the as-sintered state, since the inter-layer interface effectively dissolves during high-temperature sintering. For sand-mould materials, Z-direction strength is dominated by inter-layer binder bonding and is generally 60–90 % of XY in transverse strength.

TABLE III
 MECHANICAL PROPERTIES — Z ORIENTATION (17-4PH SS (DESKTOP METAL SHOP SYSTEM))

Binder-jet 17-4PH exhibits the lowest XY-vs-Z anisotropy among all metal AM technologies (~2–3 % UTS difference) because high-temperature sintering at ~1300 °C in H₂ atmosphere fully redistributes inter-layer porosity. This contrasts sharply with laser PBF Ti-6Al-4V or AlSi10Mg where 10–20 % anisotropy is typical. Heat treatment (solution + age) is applied uniformly across XY/Z directions and does not preferentially enhance one orientation.

V.  RECOMMENDED PROCESS PARAMETERS

Values summarised below give consensus operating windows from public datasheets (Desktop Metal, ExOne, voxeljet, cprint3d). Specific machines and parameter sets may differ within ±10 %; the supplier's verified parameter sheet always supersedes this table. For metal binder jetting, complete green-state cure (~200 °C) and a high-temperature de-bind / sinter cycle (typically 1 100–1 380 °C in H₂ / Ar / vacuum) are mandatory after print. For sand binder jetting, parts are usable directly after print (with optional microwave or oven post-cure).

TABLE IV
 RECOMMENDED BINDER-JETTING PROCESS PARAMETERS FOR 17-4PH SS (DESKTOP METAL SHOP SYSTEM)

VI.  GLASS TRANSITION TEMPERATURE (TG)

Reported / typical Tg: Not applicable (metallic alloy).

Critical thermal limits for 17-4PH: martensite start temperature Ms ≈ 130 °C (cooling); austenitisation 1020–1060 °C; aging window 480–620 °C (H900 / H1025 / H1150 conditions). Continuous service temperature ≈ 300 °C; above this, Cu precipitates over-age and strength drops.

VII.  HEAT DEFLECTION TEMPERATURE (HDT)

Heat deflection temperature is the temperature at which a standard bar deflects 0.25 mm under a specified flexural load (ASTM D648 / ISO 75).

TABLE V
 HEAT DEFLECTION TEMPERATURE OF 17-4PH SS (DESKTOP METAL SHOP SYSTEM) UNDER STANDARD TEST LOADS

VIII.  DISTINGUISHING CHARACTERISTICS AND STANDARDS

A.  Cost-effective high-strength stainless steel

Per-part cost on the Desktop Metal Shop System is approximately 1/5 to 1/10 of equivalent laser powder-bed fusion 17-4PH parts, while delivering ≥ 96 % density and full mechanical properties after H900 aging. The Shop System's high-throughput single-pass print engine (up to 800+ cm³/h jetting) makes 17-4PH economically viable for batches of 10–500 parts.

B.  Near-isotropic mechanical properties

Binder-jet 17-4PH has only 2–3 % anisotropy in UTS / yield between XY and Z, compared to 10–20 % for laser PBF. Designers can therefore orient parts purely for nesting density (build cost) rather than load alignment, dramatically simplifying the build-prep workflow.

C.  MPIF Standard 35-MIM compliant

Desktop Metal binder-jet 17-4PH meets or exceeds the published Metal Powder Industries Federation MIM-17-4PH H900 minimum properties: UTS 1190 MPa, yield 1100 MPa, elongation 4 %. Independent third-party test data (CETIM, Fraunhofer) confirm equivalence to wrought 17-4PH AMS 5643 in heat-treated condition.

D.  Geometric freedom

BJ supports near-vertical overhangs without supports because parts are fully bedded in loose powder. Internal channels, lattice cores, and hand-removable sintering setters eliminate the support-removal labor typical of laser PBF — the largest single labor-cost driver in metal AM.

E.  Heat-treatment flexibility

Beyond H900, the alloy can be aged to H1025 (552 °C, balanced strength/toughness) or H1150 (621 °C, max ductility). Solution-annealed condition is also accessible. Same printed green part, four different end-use mechanical profiles — a unique advantage over fixed-property laser PBF builds.

IX.  REPRESENTATIVE APPLICATIONS

17-4PH SS (Desktop Metal Shop System) is typically deployed in the following applications:

1)  Aerospace fittings & brackets: High-strength fittings for nacelle, fuselage, and avionics housings; H900 strength approaches 7000-series Al at 3× density but 5× toughness.

2)  Medical surgical instruments: Custom retractors, jigs, and re-usable surgical instruments leveraging biocompatibility and autoclave sterilizability (subject to ASTM F138 verification on individual builds).

3)  Industrial valve and pump components: Valve bodies, impellers, and pump housings for chemical and oil-and-gas service — corrosion resistance approximately equivalent to 304/316.

4)  Tool inserts and dies: Hardened (H900) inserts for moderate-volume injection mould tooling, where conformal cooling is enabled by AM design freedom.

5)  Consumer / lifestyle goods: Watch components, eyewear hinges, and jewellery prototypes — good polishability (Ra < 0.4 µm achievable).

X.  REFERENCES

[1]  Desktop Metal, “17-4 PH stainless steel — Material Data Sheet,” 2024. [Online]. Available: https://www.desktopmetal.com/resources/174-stainless-steel

[2]  Desktop Metal, “Material Properties of Binder Jet Parts,” Technical White Paper, 2022. [Online]. Available: https://www.desktopmetal.com/resources/material-properties-of-binder-jet-parts

[3]  Desktop Metal, “Shop System — Printer Specifications,” 2022. [Online]. Available: https://www.desktopmetal.com/uploads/SHP-SPC-Printer-220830_final.pdf

[4]  ASTM A564/A564M-19, “Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes,” 2019.

[5]  MPIF Standard 35-MIM, “Materials Standards for Metal Injection Molded Parts,” 2022 ed.

[6]  AMS 5643, “Steel, Corrosion-Resistant, Bars, Wire, Forgings, and Tubing — 17Cr-4Ni-4Cu-0.30Cb,” SAE International.

[7]  ASTM E8/E8M-22, “Standard Test Methods for Tension Testing of Metallic Materials,” ASTM International, 2022.

[8]  ASTM B962-17, “Standard Test Methods for Density of Compacted or Sintered Powder Metallurgy (PM) Products Using Archimedes' Principle,” ASTM International, 2017.

[9]  ASTM E18-22, “Standard Test Methods for Rockwell Hardness of Metallic Materials,” ASTM International, 2022.

[10]  ASTM F3318-22, “Standard for Additive Manufacturing — Finished Part Properties — Specification for AlSi10Mg with Powder Bed Fusion — Laser Beam,” ASTM International, 2022.

[11]  ISO/ASTM 52900:2021, “Additive manufacturing — General principles — Fundamentals and vocabulary,” ISO, 2021.

[12]  ISO/ASTM 52904:2024, “Additive manufacturing — Process characteristics and performance — Practice for metal powder bed fusion process to meet critical applications,” ISO, 2024.

[13]  MPIF Standard 35-MIM, “Materials Standards for Metal Injection Molded Parts,” Metal Powder Industries Federation, 2022 ed.

[14]  Desktop Metal, “Material Properties of Binder Jet Parts,” Desktop Metal Technical White Paper. [Online]. Available: https://www.desktopmetal.com/resources/material-properties-of-binder-jet-parts

[15]  Desktop Metal, “Why Binder Jetting?” Desktop Metal Application Note. [Online]. Available: https://www.desktopmetal.com/resources/why-binder-jetting-1

[16]  Desktop Metal, “Materials portfolio overview,” Desktop Metal product page. [Online]. Available: https://www.desktopmetal.com/materials/

(Image Source : Forgelabs)