630 Stainless Steel Plate & Coil: Precipitation-Hardening High-Strength Industrial Plate/Coil

What is 630 Stainless Steel Plate & Coil?

630 stainless steel plate & coil (also known as 17-4PH) is a martensitic precipitation-hardening stainless steel product, featuring ultra-high strength after aging treatment, while retaining good corrosion resistance and toughness. It is widely used in high-load, precision industrial components.

Equivalent Grades (Horizontal)

UNS: S17400 | JIS: SUS630 | GB: 05Cr17Ni4Cu4Nb | EN: X5CrNiCuNb17-4 | W.Nr.: 1.4542

Chemical Composition (wt%, Horizontal)

C: ≤0.07 | Si: ≤1.00 | Mn: ≤1.00 | P: ≤0.040 | S: ≤0.030 | Cr: 15.00-17.50 | Ni: 3.00-5.00 | Cu: 3.00-5.00 | Nb: 0.15-0.45 | Fe: Balance

Key Properties (20°C, Aged, Horizontal)

Density: 7.75g/cm³ | Melting Point: 1430-1480°C | Tensile Strength: ≥1030N/mm² | Yield Strength: ≥860N/mm² | Elongation: ≥10% | Hardness: ≥302HB

Core Characteristics

• Precipitation hardening advantage: Achieves ultra-high strength through aging treatment, no need for high-temperature quenching, reducing deformation • Balanced corrosion resistance: Superior to martensitic grades, resistant to mild corrosive media, suitable for harsh industrial environments • Good dimensional stability: Low deformation during heat treatment, ideal for precision components and structural parts • Versatile application: Used in aerospace parts, mechanical engineering, valve cores and high-strength fasteners

630 vs 431 Stainless Steel Plate & Coil (Horizontal)

Alloy Type: 630 (Precipitation-Hardening) | 431 (Martensitic) | Tensile Strength: 630 (≥1030N/mm²) | 431 (≥880N/mm²) | Hardness: 630 (≥302HB) | 431 (≤285HB) | Corrosion Resistance: 630 (Better) | 431 (Good)

 

Stainless Steel Suppliers

If you have project requirements for stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com

 

Testing and Documentation: Factory test certificate, EN 10204 3.1, chemical report, mechanical report, destructive testing report, non-destructive testing report, PMI test report, visual inspection report, third-party inspection report, NABL certified laboratory report.
Packaging: Wooden crate packaging, bubble wrap packaging, steel strapping, or packaging according to customer requirements.