631 Stainless Steel Plate & Coil: Precipitation-Hardening Corrosion-Resistant Plate/Coil

What is 631 Stainless Steel Plate & Coil?

631 stainless steel plate & coil (also known as 17-7PH) is an austenitic-martensitic precipitation-hardening stainless steel, combining high strength, excellent corrosion resistance and good formability, suitable for precision and corrosive environment components.

Equivalent Grades (Horizontal)

UNS: S17700 | JIS: SUS631 | GB: 07Cr17Ni7Al | EN: X7CrNiAl17-7 | W.Nr.: 1.4568

Chemical Composition (wt%, Horizontal)

C: ≤0.09 | Si: ≤1.00 | Mn: ≤1.00 | P: ≤0.040 | S: ≤0.030 | Cr: 16.00-18.00 | Ni: 6.50-7.75 | Al: 0.75-1.50 | Fe: Balance

Key Properties (20°C, Aged, Horizontal)

Density: 7.70g/cm³ | Melting Point: 1430-1480°C | Tensile Strength: ≥1100N/mm² | Yield Strength: ≥960N/mm² | Elongation: ≥8% | Hardness: ≥321HB

Core Characteristics

• Dual-phase precipitation hardening: Transforms from austenite to martensite, then achieves high strength through aging, balancing strength and toughness • Excellent corrosion resistance: Resists atmospheric, fresh water and mild chemical corrosion, better than ordinary martensitic grades • Good formability: Easy to cold form and weld before aging, suitable for complex-shaped precision components • Specialized for high-end scenarios: Applied in aerospace, nuclear industry, precision instruments and marine components

631 vs 630 Stainless Steel Plate & Coil (Horizontal)

Strengthening Element: 631 (Al) | 630 (Cu+Nb) | Tensile Strength: 631 (≥1100N/mm²) | 630 (≥1030N/mm²) | Formability: 631 (Better) | 630 (Good) | Corrosion Resistance: 631 (Superior) | 630 (Better)

 

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.