17-4PH Stainless Steel: Properties, Processing, and Applications by Lork Group
2025-07-10
17-4PH (UNS S17400) is a martensitic precipitation-hardening stainless steel known for its high strength, excellent corrosion resistance, and adjustable mechanical properties through heat treatment. Widely used in aerospace, petrochemical, medical, and marine industries, this alloy outperforms conventional austenitic grades like 304 and 316L in strength and wear resistance.
Lork Group, a leading manufacturer of high-performance alloys, produces precision cold-rolled 17-4PH steel strips and a full range of product forms, ensuring superior quality for demanding industrial applications.
Key Characteristics of 17-4PH Stainless Steel
1. Adjustable Strength via Heat Treatment
Unlike standard austenitic steels, 17-4PH’s strength can be precisely controlled by modifying the heat treatment process:
Solution Annealed (Condition A): Soft state for machining (HRC ~34).
H900 (Aged at 900°F): Peak hardness (~HRC 42-45), tensile strength ≥1,300 MPa.
H1150 (Overaged): Balanced strength and toughness for high-temperature applications.
2. Superior Mechanical Properties
High Strength: Up to 1,000+ MPa after aging.
Excellent Corrosion Resistance: Comparable to 304 in most environments.
Good Fatigue & Wear Resistance: Ideal for dynamic load applications.
3. Unique Processing Challenges
Due to its martensitic precipitation-hardening nature, 17-4PH requires:
Electroslag Remelting (ESR): Ensures high-purity steel with minimal segregation.
Precision Cold Rolling & Solution Treatment: Demands tight process control to avoid cracking.
Lork Group’s 17-4PH Cold-Rolled Steel Strip
Product Specifications
- Dimensions: 0.65 mm × 13 mm (cold-rolled strip)
- Delivery Condition: Solution annealed (HRC 34)
- Standards: Complies with AMS 5643, ASTM A693, and ASTM A564
Production Expertise
Lork Group overcomes manufacturing challenges through:
- Electroslag Technology: Reduces impurities and enhances homogeneity.
- Controlled Rolling & Heat Treatment: Ensures uniform hardness and microstructure.
- Full Material Traceability: Mill test reports (MTRs) provided for quality assurance.
Applications of 17-4PH Stainless Steel
1. Aerospace & Defense
Aircraft fittings, turbine blades, and fasteners.
2. Oil & Gas
Valve components, pump shafts, and offshore drilling equipment.
3. Medical & Surgical Tools
Scalpels, orthopedic implants, and dental instruments.
4. Industrial & Chemical Processing
Shafts, gears, and reactor parts in corrosive environments.
Lork Group’s 17-4PH Product Range
Beyond cold-rolled strips, Lork Group supplies 17-4PH in multiple forms:
- Round Bars (0.8 mm – 700 mm)
- Forgings, Plates, and Sheets
- Rectangular/Square Bars & Pipes
- Custom Fabricated Components
Why Choose Lork Group?
- Decades of Special Alloy Experience – Precision manufacturing for critical industries.
- End-to-End Quality Control – From raw material to final product.
- Global Supply Capability – Reliable delivery to USA, Europe, Asia, and beyond.
Contact Lork Group today for your 17-4PH alloy needs! Request a free quote and technical support for corrosion-resistant, high-strength solutions.
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