304 316L 321 310S Forged Stainless Steel Plate Superior Strength for HeavyDuty Applications

Products Specification

SUS630 & SUS631 Stainless Steel Plates – High-Strength Precipitation-Hardening Alloys

1. Product Overview

• SUS630 (17-4PH) and SUS631 (17-7PH) are premium precipitation-hardening (PH) stainless steels, offering an exceptional combination of high strength, corrosion resistance, and heat resistance.

• These alloys achieve superior mechanical properties through solution treatment + aging (precipitation hardening), making them ideal for critical aerospace, chemical, and industrial applications.

2. Key Parameters & Chemical Composition

3. Standards & Certifications

• JIS (Japanese Industrial Standard): G4303 (SUS630, SUS631)

• ASTM (American Standard):

  • SUS630: A564 (17-4PH)

  • SUS631: A693 (17-7PH)

• AMS (Aerospace Material Spec):

  • SUS630: AMS 5604, AMS 5643

  • SUS631: AMS 5528, AMS 5529

• Other: EN 10088-3 (European Standard)

4. Key Features & Advantages

✔ Ultra-High Strength – Achieves 3-4x the strength of standard 304/316 stainless steel after heat treatment.
✔ Excellent Corrosion Resistance – Resists pitting, stress corrosion cracking (SCC), and oxidation.
✔ Precision Machinability – Can be machined in annealed condition, then hardened for final use.
✔ Thermal Stability – Retains strength at temperatures up to 300°C (SUS630) / 400°C (SUS631).
✔ Customizable Hardness – Properties can be adjusted via aging temperature (e.g., H900, H1150 for SUS630).

5. Available Specifications

• Thickness: 0.5mm – 100mm (custom sizes available)

• Width: 1000mm – 2000mm (or as required)

• Surface Finish:

  • Cold-rolled, hot-rolled

  • Polished (No.4, BA, Mirror)

  • Blasted, pickled

• Forms: Plates, sheets, bars, forgings

6. Typical Applications

SUS630 (17-4PH) – Best for High-Strength & Moderate Corrosion Resistance

• Aerospace: Landing gear components, turbine blades

• Oil & Gas: Valve shafts, pump parts

• Medical: Surgical instruments

• Industrial: High-stress bolts, nuclear reactor parts

SUS631 (17-7PH) – Best for Spring Applications & High Fatigue Resistance

• Springs & Fasteners: High-tension springs, washers

• Defense: Missile components, aircraft fittings

• Chemical Industry: Heat exchangers, pressure vessels

• Precision Engineering: Watch parts, optical instruments

7. Why Choose Our SUS630/SUS631 Plates?

• Strict Quality Control – Full traceability with MTC (Mill Test Certificates).
• Custom Heat Treatment – Tailored aging process for optimal performance.
• Global Standards Compliance – Meets ASTM, JIS, AMS, and EN requirements.
• Competitive Pricing & Fast Delivery – Stock available for quick shipment.

Contact us today for technical support or a customized quote!

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