JIS G4305 SUS630 Steel Plate | 630 Stainless Steel
What is JIS G4305 SUS630 Steel Plate?
As a professional stainless steel supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G4305 SUS630 Steel Plate (also known as 630 stainless steel or 17-4PH).
SUS630 is a precipitation-hardening (PH) martensitic stainless steel under the Japanese standard JIS G4305. It is equivalent to the widely known 17-4PH grade. In the solution-annealed condition it is relatively soft and machinable. After aging treatment (precipitation hardening), it develops high strength, good toughness and corrosion resistance superior to standard 410 and 420 martensitic grades. SUS630 is widely used in aerospace, chemical, petrochemical, and high-strength mechanical components.
SHH STEEL supplies SUS630 as Mill Direct Supply, sourcing directly from major Chinese stainless steel mills. This ensures competitive mill pricing, consistent quality, shorter lead times and full traceability. We offer plates and sheets in various thicknesses, widths up to 1500 mm or more, in solution-annealed or aged condition according to customer requirements. All materials are delivered with full Mill Test Certificates.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | JIS G4305 | Full compliance |
| Steel Grade | SUS630 | Confirmed |
| Product Form | Plate / Sheet / Coil | Available |
| Condition | Solution Annealed / Aged (H900, H1025, H1075, H1150, etc.) | Available |
| Thickness Range | 0.5 mm – 50 mm (typical) | Custom sizes available |
| Width | Up to 1500 mm or wider | Available |
| Certification | EN 10204 3.1 / Mill Certificate | Available |
Chemical Composition
Chemical composition according to JIS G4305 / equivalent standards (Heat Analysis):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.07 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 15.00 – 17.50 |
| Nickel (Ni) | 3.00 – 5.00 |
| Copper (Cu) | 3.00 – 5.00 |
| Niobium (Nb) | 0.15 – 0.45 |
Note: Copper and niobium enable precipitation hardening, which develops high strength after aging treatment.
Mechanical Properties
Solution Annealed Condition (typical):
| Property | Value |
|---|---|
| Yield Strength (0.2%) | ≥ 725 MPa |
| Tensile Strength | ≥ 930 MPa |
| Elongation | ≥ 10% |
| Hardness | ≤ 363 HB |
After Aging Treatment (examples):
| Condition | Yield Strength (min) | Tensile Strength (min) | Hardness (approx.) |
|---|---|---|---|
| H900 | 1170 MPa | 1310 MPa | 40–45 HRC |
| H1025 | 1000 MPa | 1070 MPa | 35–40 HRC |
| H1075 | 860 MPa | 1000 MPa | 31–38 HRC |
| H1150 | 725 MPa | 930 MPa | 28–35 HRC |
Density: Approximately 7.80 g/cm³ Magnetic: Yes (martensitic PH)
Delivery Conditions
SHH STEEL supplies JIS G4305 SUS630 as Mill Direct Supply in the following conditions:
- Solution Annealed (most common for further processing)
- Precipitation Hardened (aged) to H900, H1025, H1075, H1150 or other conditions upon request
Additional options available:
- Cut-to-size plates
- Surface grinding or polishing
- Third-party inspection (SGS, BV, TUV, etc.)
Key Characteristics
- High strength after precipitation hardening
- Good corrosion resistance (better than 410/420 series)
- Excellent combination of strength and toughness
- Good machinability in solution-annealed condition
- Can be heat treated to various strength levels
- Magnetic
- Widely used as 17-4PH equivalent
Equivalent Material Grades
| Grade | Standard | Notes |
|---|---|---|
| SUS630 | JIS G4305 / G4303 | — |
| 630 / 17-4PH | ASTM A564 / A693 | American equivalent |
| 1.4542 / X5CrNiCuNb16-4 | EN 10088-3 | European equivalent |
| 05Cr17Ni4Cu4Nb | GB/T 1220 / GB/T 3280 | Chinese equivalent |
| UNS S17400 | — | Unified Numbering System |
Applications
JIS G4305 SUS630 (630 / 17-4PH) is widely used in high-strength applications requiring good corrosion resistance. Typical applications include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Aerospace | Structural components, fasteners – 630 Aerospace |
| Oil & Gas / Petrochemical | Valve parts, pump shafts, wellhead components – 630 Oil Gas |
| Chemical Equipment | High-strength parts – 630 Chemical |
| Machinery | Shafts, gears, high-strength components – 630 Machinery |
| Medical & Surgical | Surgical instruments, orthopedic devices – 630 Medical |
| General High-Strength Parts | Fasteners, fittings – 630 Fabrication |
Why Choose SHH STEEL
SHH STEEL provides SUS630 as Mill Direct Supply. We maintain long-term strategic cooperation with major Chinese stainless steel mills and act as a first-level agent. This direct mill supply model allows us to offer competitive mill-direct pricing, faster delivery times, consistent quality, and full Mill Test Certificates for JIS G4305 SUS630 Steel Plate.
Customers benefit from reliable supply, short lead times and cost-effective solutions for precipitation-hardening stainless steel projects. Our professional export team provides technical support on heat treatment conditions, material selection and processing.
FAQ
- Is SUS630 the same as 17-4PH?Yes. SUS630 is the Japanese designation for the precipitation-hardening stainless steel commonly known as 17-4PH or 630.
- What is the advantage of SUS630 over 410 or 420?US630 offers significantly higher strength after aging, better corrosion resistance, and a better combination of strength and toughness.
- In what condition is SUS630 usually supplied?Most commonly in the solution-annealed condition for ease of machining and forming. Aging treatment can be performed afterward or supplied in aged condition upon request.
- What is the density of SUS630?Approximately 7.80 g/cm³.
Conclusion
JIS G4305 SUS630 Steel Plate (630 Stainless Steel / 17-4PH) from SHH STEEL is a high-performance precipitation-hardening stainless steel offering excellent strength, good toughness and reliable corrosion resistance. As Mill Direct Supply, we provide competitive pricing, consistent quality and full technical support. Trust SHH STEEL for your SUS630 stainless steel requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G4305 SUS630 Steel Plate, SUS630, 630 stainless steel, 17-4PH, 630 stainless steel plate, SUS630 supplier
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