17-4PH Stainless Steel Hollow Pipes Combining Strength and Corrosion Protection

Products Specification

17-4PH Stainless Steel Tubing - Product Information

1. Description:
17-4PH Stainless Steel Tubing is a high-performance precipitation-hardening martensitic stainless steel offering an exceptional combination of properties:

• High Strength & Hardness: Achieves significantly higher mechanical properties than standard austenitic grades (like 304/316) through a simple aging heat treatment.

• Good Corrosion Resistance: Resists corrosion comparable to Type 304 stainless steel in many environments, particularly useful for moderate acids, freshwater, steam, and petroleum products.

• Excellent Fabricability: Can be readily machined, welded (in the solution-annealed condition), and formed prior to the final aging treatment.

• Good Mechanical Properties at Elevated Temperatures: Maintains strength up to approximately 600°F (315°C).

• Magnetic: Exhibits magnetic properties, especially in the aged condition.

This versatile material is supplied in the solution annealed (Condition A) state, ready for forming/fabrication and subsequent heat treatment (aging) to achieve the desired strength level (e.g., H900, H1025, H1100, H1150).

2. Key Parameters & Properties (Typical - Solution Annealed & Aged):

• Common Specifications:

  • ASTM A564 (Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes - covers some tube forms)

  • AMS 5643 (Aerospace Material Specification)

  • UNS S17400

  • DIN 1.4542 / EN X5CrNiCuNb16-4

• Chemical Composition (Typical % Weight):

  • Chromium (Cr): 15.0 - 17.5

  • Nickel (Ni): 3.0 - 5.0

  • Copper (Cu): 3.0 - 5.0

  • Manganese (Mn): 1.00 max

  • Silicon (Si): 1.00 max

  • Niobium (Nb) + Tantalum (Ta): 0.15 - 0.45

  • Carbon (C): 0.07 max

  • Phosphorus (P): 0.04 max

  • Sulfur (S): 0.03 max

  • Iron (Fe): Balance

• Physical Properties:

  • Density: 0.282 lb/in³ (7.80 g/cm³)

  • Melting Point: ~ 2560°F - 2625°F (~1400°C - 1440°C)

  • Electrical Resistivity: 30.0 microhm-cm (20°C)

  • Magnetic Response: Magnetic (Martensitic)

• Mechanical Properties (Typical Aged - H900 Condition):

  • Tensile Strength: 190,000 psi min (1310 MPa min)

  • Yield Strength (0.2% Offset): 170,000 psi min (1170 MPa min)

  • Elongation (in 2" or 50mm): 10% min

  • Hardness: Rockwell C 40 - 48 (HRC)

  • *(Properties vary significantly based on Aging Condition: H1025, H1100, H1150 offer lower strength/hardness but improved toughness and stress corrosion cracking resistance)*

• Available Forms & Dimensions (Typical):

  • Types: Seamless Tubing (SMLS), Welded Tubing (Welded & Cold Worked)

  • Outer Diameter (OD): Ranges from small precision diameters (e.g., 0.125" / 3.18mm) up to several inches.

  • Wall Thickness (WT): From light wall (e.g., 0.020" / 0.51mm) to heavy wall, depending on OD.

  • Lengths: Standard cut lengths (e.g., 12ft, 20ft / 3m, 6m), or random lengths. Custom cuts available.

  • Tolerances: Supplied to standard industrial tolerances (e.g., ASTM A269, ASTM A511) or tighter precision tolerances upon request.

• Surface Finish: Typically supplied with a standard mill finish (annealed/pickled). Polished (e.g., #4, #8) or special finishes available upon request.

3. Standards & Certifications:

• Material is produced to meet or exceed relevant ASTM (A564), AMS (5643), and other applicable national/international standards.

• Material Test Reports (MTRs / Certs of Conformance) are available, traceable to heat/lot number, providing chemical analysis and mechanical properties.

• Compliance with RoHS, REACH, and other regulatory requirements can typically be confirmed.

4. Packaging:

• Tubes are carefully packaged to prevent damage during transit and storage.

• Standard Packaging: Bundled securely with protective end caps and wrapped in weather-resistant material (e.g., plastic, paper). Shipped on wooden pallets or in sturdy crates.

• Special Packaging: Available upon request (e.g., individual tube boxing, VCI paper for enhanced corrosion protection, specific palletization requirements).

• All packages are clearly labeled with material grade, size, heat number, quantity, and purchase order information.

5. Value-Added Processing Services:

• Precision Cutting: Cut-to-length, saw cutting, abrasive cutting, laser cutting (depending on size).

• Heat Treatment (Aging): Performed to customer-specified conditions (H900, H925, H1025, H1075, H1100, H1150, H1150M). H1150M is recommended for heavy sections or maximum toughness/resistance to stress corrosion cracking.

• Machining: Turning, milling, drilling, tapping.

• End Forming: Flaring, beading, swaging.

• Welding: TIG (GTAW) welding services (using compatible filler metal like 17-4PH or 630).

• Surface Finishing: Polishing, passivation, light grinding.

• Non-Destructive Testing (NDT): Eddy Current Testing (ECT), Hydrostatic Testing, Ultrasonic Testing (UT) available upon request.

6. Typical Applications:
17-4PH tubing is widely used in demanding applications requiring high strength, good corrosion resistance, and moderate temperature capability:

• Aerospace: Aircraft fittings, engine components, hydraulic lines, actuators, fasteners.

• Oil & Gas: Downhole instrumentation housings, valve components, chemical injection lines, umbilicals.

• Chemical Processing: Pump shafts, valve stems, fittings exposed to moderate corrosives.

• Power Generation: Turbine blades, fasteners, instrumentation tubing.

• Medical Devices: Surgical instruments, implants (requires specific biocompatibility verification), dental tools.

• Marine & Defense: Shafts, fittings, fasteners, submarine components.

• General Industrial: High-strength shafts, spindles, fasteners, hydraulic pistons/rods, bearings.

Contact Us:
For specific sizes, quantities, certifications, custom processing requests, or technical support regarding 17-4PH Stainless Steel Tubing, please contact our sales or engineering team.