Table of Contents
- 15-5PH & 17-4PH Square & Hex Bars Overview
- Technical Specifications
- Chemical Composition & Mechanical Properties
- SS 17-4PH vs SS 15-5PH
- Types of 15-5PH & 17-4PH Bars: Hex & Square Profiles
- Key Advantages of 15-5PH & 17-4PH Bars
- Key Applications of 15-5PH & 17-4PH Bars
- Heat Treatment Conditions
- Quality Testing & Inspection
- Global Export Markets
- Frequently Asked Questions
- Contact Aurum Overseas
15-5PH & 17-4PH Square & Hex Bars Overview
Precipitation-hardening stainless steel bars are supplied globally by Aurum Overseas, a premier stockist and exporter. As a trusted SS 17-4PH Square Bars and Hex Bars Exporter, our stock meets ASTM A564 standards. Our 17-4PH Stainless Steel Square Bars and 17-4PH Stainless Steel Hex Bars deliver maximum strength and wear resistance for high-stress valve stems and shafts.
For aerospace parts and hydraulic blocks, Aurum Overseas is a leading SS 15-5PH Square Bars and SS 15-5PH Hex Bars Supplier. Our 15-5PH Stainless Steel Square Bars and 15-5PH Stainless Steel Hex Bars are vacuum arc remelted (VAR) to eliminate internal weak spots, providing uniform multi-axis strength.
Engineered for oilfield tooling, actuators, and pumps, our bar stock spans Condition A to H1150 tempers. Contact Aurum Overseas today for fast factory quotes and certified mill test reports.
Technical Specifications
| Technical Parameter | Specification Standard |
|---|---|
| Material Specifications | ASTM A564, ASME SA564, AMS 5643 (17-4PH), AMS 5659 (15-5PH), EN 10204 3.1 |
| UNS Designations | UNS S17400 (17-4PH) / UNS S15500 (15-5PH) |
| Across-Flats (AF) Size Range | 6.35 mm to 152.4 mm (1/4" to 6" Square & Hexagon Profiles) |
| Length Options | 1,000 mm to 6,000 mm, Custom Sawing and Cut-to-Length |
| Surface Finishes | Cold Drawn, Centerless Ground, Turned, Hot Rolled, Smooth Turned |
| Heat Treatment Conditions | Condition A (Solution Annealed), H900, H1025, H1075, H1150, H1150D (Double Aged) |
| Dimensional Tolerances | ASTM A484 / ISO 286-2 (h9, h10, h11 profile tolerances) |
| HSN Code | 72221100 / 72222000 |
Chemical Composition & Mechanical Properties
Equivalent Standards
| Grade | ASTM | Werkstoff Nr. | UNS | EN Standard | AFNOR |
|---|---|---|---|---|---|
| 17-4PH | ASTM A564 | 1.4542 | S17400 | X5CrNiCuNb16-4 | Z6CNU17-04 |
| 15-5PH | ASTM A564 | 1.4545 | S15500 | X5CrNiCu15-5 | Z6CNU15-05 |
Chemical Composition (%)
| Chemical Element | SS 17-4PH (UNS S17400) | SS 15-5PH (UNS S15500) |
|---|---|---|
| Carbon (C) | 0.07 max | 0.07 max |
| Manganese (Mn) | 1.00 max | 1.00 max |
| Silicon (Si) | 1.00 max | 1.00 max |
| Phosphorus (P) | 0.040 max | 0.040 max |
| Sulfur (S) | 0.030 max | 0.030 max |
| Chromium (Cr) | 15.00 – 17.50 | 14.00 – 15.50 |
| Nickel (Ni) | 3.00 – 5.00 | 3.50 – 5.50 |
| Copper (Cu) | 3.00 – 5.00 | 2.50 – 4.50 |
| Niobium (Nb) / Tantalum (Ta) | Nb: 0.15 – 0.45 | Nb + Ta: 0.15 – 0.45 |
Mechanical Properties (Condition H900 - Peak Hardened)
| Property Parameter | SS 17-4PH (UNS S17400) | SS 15-5PH (UNS S15500) |
|---|---|---|
| Tensile Strength (Min) | 1,310 MPa (190,000 Psi) | 1,310 MPa (190,000 Psi) |
| Yield Strength (0.2% Offset, Min) | 1,170 MPa (170,000 Psi) | 1,170 MPa (170,000 Psi) |
| Elongation in 2" (Min) | 10 % | 10 % |
| Reduction of Area (Min) | 40 % | 45 % |
| Hardness (Rockwell C) | 40 – 47 HRC | 40 – 47 HRC |
SS 17-4PH vs SS 15-5PH
| Feature | 17-4PH (UNS S17400) | 15-5PH (UNS S15500) |
|---|---|---|
| Material Cleanliness & Purity | Standard steel mill refining; potential micro-inclusions | Ultra-clean vacuum arc remelted matrix; zero non-metallic inclusions |
| Microstructure & Toughness | Standard longitudinal strength; contains directional delta ferrite | Ferrite-free isotropic structure with high transverse impact strength |
| Corrosion Resistance | Slightly higher Chromium (15.0–17.5%) for general exposure | Balanced Chromium (14.0–15.5%) + Nickel for extreme pressure environments |
| Best Used For | General-duty pump shafts, valve stems, and standard industrial hex fittings | High-fracture-risk applications like aircraft forgings and subsea manifolds |
Types of 15-5PH & 17-4PH Bars: Hex & Square Profiles
Aurum Overseas supplies 15-5PH and 17-4PH stainless steel bars in precision hexagonal and square profiles for high-strength applications.
SS 17-4PH & 15-5PH Hex Bars
SS 17-4PH & 15-5PH Square Bars
Key Advantages of 15-5PH & 17-4PH Bars
Simple Heat Hardening
Heat treatment between 480 °C and 620 °C delivers extreme strength without bending, warping, or cracking the material.
Flaw-Free Uniform Strength (15-5PH)
Special double-melting removes internal weak spots, ensuring equal metal strength from every direction under high pressure.
Sour Gas & Rust Defense
Over-aged conditions stop rust, pitting, and cracking in harsh saltwater and H2S oilfield environments.
Precise Machine-Ready Shapes
Pre-cut square and hex profiles save machine time, lower scrap waste, and reduce cutting tool wear.
Key Applications of 15-5PH & 17-4PH Bars
| Industry | Applications | Operational Benefit |
|---|---|---|
| Aerospace & Defense | Flight control pins, actuator hex shafts, gear bolts | Delivers maximum load strength with zero structural cracking risk. |
| Oil & Gas Downhole | Valve stems, subsea wellhead pins, drill tool parts | Prevents sour gas (H2S) stress cracking in high-pressure wells. |
| Power Generation | Turbine blades, reactor valves, steam control rods | Holds tight tolerances and resists high-pressure steam wear. |
| Chemical & Marine | Pump shafts, impellers, hydraulic manifold blocks | Stops saltwater rust and galling on high-speed rotating parts. |
Heat Treatment Conditions
Our 15-5PH and 17-4PH bars are available in a full range of heat treatment conditions to match specific strength and toughness requirements:
- Condition A (Solution Annealed): Softest condition, ideal for machining before final aging.
- H900: Peak hardness and strength (highest tensile and yield).
- H1025 / H1075: Balanced strength and toughness.
- H1150 / H1150D (Double Aged): Maximum toughness and improved corrosion resistance for sour service.
Quality Testing & Inspection
As an established SS 17-4PH Square Bars and SS 15-5PH Hex Bars Supplier, Aurum Overseas subjects all shipments to multi-stage quality assurance:
- Positive Material Identification (PMI): XRF testing verifying precise Cr, Ni, Cu, and Nb balances on every bar.
- Mechanical & Impact Testing: Room temperature tensile, Charpy V-notch impact, and Rockwell C hardness testing verifying heat treatment condition response.
- Microstructure & Grain Size Analysis: Metallographic evaluation ensuring delta-ferrite levels remain within specification limits (0% target for 15-5PH).
Global Export Markets
As an established 15-5PH & 17-4PH Square & Hex Bar Exporter, Aurum Overseas supplies fully certified ASTM A564 bars to global aerospace, oil & gas, power generation, and chemical facilities:
USA
Canada
Mexico
Germany
United Kingdom
France
Italy
Netherlands
Belgium
Spain
Poland
UAE
Saudi Arabia
Qatar
Kuwait
Oman
Bahrain
Frequently Asked Questions
15-5PH is processed via Vacuum Arc Remelting (VAR) and formulated with reduced chromium and balanced nickel to eliminate delta ferrite. This gives 15-5PH uniform transverse toughness, whereas 17-4PH may exhibit directional toughness variation.
Yes. Both alloys are typically machined in Condition A (Solution Annealed), where the matrix is relatively soft martensite. After machining, parts are age-hardened to target properties without distortion.
Square and hex profiles allow direct machining of valve bodies, manifold blocks, specialized fasteners, and wrench-flats with minimal material removal, reducing machining cycles and scrap.
Contact Aurum Overseas
Contact a dedicated SS 17-4PH Hex Bars and SS 15-5PH Square Bars Exporter for technical support, precision sawing services, and factory-direct export pricing.