630 Stainless Steel Coil: High-Strength, Corrosion-Resistant Precipitation-Hardening Stainless Steel
Meta Description: Explore 630 stainless steel coil offering up to 1300 MPa strength, good corrosion resistance, and excellent fatigue performance. Ideal for aerospace, medical, and industrial applications.
Introduction
630 Stainless Steel Coil (UNS S17400) is a precipitation-hardening stainless steel that delivers exceptional strength and corrosion resistance, making it a perfect choice for critical industries such as aerospace, medical, and industrial applications. Also known as 17-4PH stainless steel coil, it offers a remarkable yield strength of up to 1300 MPa while maintaining good corrosion resistance against various aggressive environments like chlorides and seawater.
This material’s martensitic structure provides excellent fatigue resistance and machinability in its annealed condition, making it an ideal option for applications such as springs, fasteners, valve components, and medical instruments. Whether you need 630 stainless steel coil in 2B, bright annealed, or polished finishes, we offer premium products that meet your specific requirements.
Our 630 stainless steel coil combines high strength with excellent durability, making it an essential material for high-stress applications. It offers cost-effective solutions compared to alternative grades like 304 and 316, while also maintaining its mechanical integrity even in the most demanding environments.
Product Overview & Key Advantages
- High Strength: 630 stainless steel coil achieves up to 1300 MPa yield strength, offering outstanding performance in aerospace and medical applications.
- Corrosion Resistance: Exhibits strong resistance to pitting, stress corrosion cracking, and general corrosion, particularly in chloride-rich environments.
- Excellent Fatigue Resistance: Due to its martensitic structure, it provides superior fatigue strength and long-term reliability in high-stress conditions.
- Versatile Applications: Ideal for aerospace springs, medical fasteners, turbine components, pump shafts, and nuclear reactor parts.
- Machinability: Easily machinable in the annealed condition while maintaining high strength after precipitation hardening.
- Precipitation Hardening: Achieves a wide range of mechanical properties through aging treatments, allowing for customized strength levels based on application needs.
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Chromium (Cr) | 15–17.5 |
| Nickel (Ni) | 3–5 |
| Copper (Cu) | 3–5 |
| Niobium (Nb) | 0.15–0.45 |
| Tantalum (Ta) | 0.15–0.45 |
| Carbon (C) | ≤ 0.07 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.03 |
| Iron (Fe) | Balance |
The chemical composition of 630 stainless steel coil is carefully engineered to balance strength, ductility, and corrosion resistance. With high chromium content (15–17.5%) and nickel (3–5%), it offers excellent resistance to oxidation and corrosion in both aqueous and gas environments. The addition of copper (3–5%) enhances its ability to resist corrosion in aggressive environments, while niobium and tantalum contribute to its precipitation-hardening capabilities, allowing for tailored mechanical properties.
Mechanical Properties
| Condition | Yield Strength (MPa) | Ultimate Tensile Strength (MPa) | Elongation (%) | Hardness (HRC) |
|---|---|---|---|---|
| Solution Annealed | 550 | 850 | 20 | 25–30 |
| H900 | 900 | 1050 | 10 | 35–40 |
| H925 | 925 | 1100 | 8 | 38–42 |
| H1025 | 1025 | 1200 | 6 | 40–44 |
| H1150 | 1150 | 1300 | 5 | 42–46 |
| H1150M | 1150 | 1300 | 5 | 44–48 |
630 stainless steel coil exhibits impressive strength across all heat treatment conditions, from solution annealed to H1150M, which offers maximum hardness (up to 48 HRC). This makes it an ideal material for applications requiring high tensile strength and fatigue resistance. The H900 condition provides excellent yield strength of 900 MPa, ideal for many industrial and aerospace applications.
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.75 |
| Thermal Conductivity (W/m·K) | 16.3 |
| Specific Heat (J/kg·K) | 460 |
| Electrical Resistivity (Ω·cm) | 0.00074 |
| Magnetic (after hardening) | Yes |
630 stainless steel coil has a density of 7.75 g/cm³, which is typical for high-strength materials. It also features moderate thermal conductivity (16.3 W/m·K) and electrical resistivity (0.00074 Ω·cm), offering stable performance in applications requiring thermal management and electrical resistance. After hardening, it becomes magnetic, which should be considered in specific applications that require non-magnetic properties.
630 vs 631 vs 17-4PH vs 304 vs 316 Coil Comparison
| Property | 630 Stainless Steel | 631 Stainless Steel | 17-4PH Stainless Steel | 304 Stainless Steel | 316 Stainless Steel |
|---|---|---|---|---|---|
| Yield Strength (MPa) | 1300 | 1200 | 1100 | 250 | 290 |
| Corrosion Resistance | Good | Excellent | Excellent | Good | Excellent |
| Hardness (HRC) | 35–48 | 32–45 | 38–44 | 20–30 | 25–35 |
| Heat Treatment | H900, H925, H1025, H1150 | H900 | RH950, CH900 | Annealed | Annealed |
| Cost | Moderate | Moderate | Moderate | Low | High |
When compared to 17-4PH, 630 stainless steel coil offers higher strength and good corrosion resistance, while maintaining superior machinability. 316 stainless steel offers the best corrosion resistance but at a significantly higher cost. 630 stainless steel coil presents a cost-effective solution without compromising on performance.
Available Specifications
| Thickness (mm) | Width (mm) | ID (mm) | Finish Types |
|---|---|---|---|
| 0.3–8.0 | 20–1500 | 300/400/508/610 | 2B, 2D, Bright Annealed, No.4, Polished |
Our 630 stainless steel coil is available in a wide range of thicknesses (0.3 mm to 8.0 mm) and widths (20 mm to 1500 mm), with inner diameters ranging from 300 mm to 610 mm. It is available in multiple finishes, including 2B, bright annealed, No.4, and polished, to meet your application-specific needs.
Heat Treatment & Precipitation Hardening Guide
630 stainless steel undergoes solution annealing at 1038°C to dissolve carbides and ensure a uniform structure. It can then be aged in various conditions (H900, H925, H1025, H1150, H1150M) to achieve the desired balance of strength and hardness, ranging from 28 HRC to 48 HRC, depending on the aging process.
Major Applications
- Aerospace springs & fasteners
- Medical instrument components
- High-strength bellows
- Pump shafts
- Valve trim
- Turbine parts
- Nuclear reactor components
- Surgical tools
- High-performance springs
- Chemical processing coil tubing
630 stainless steel coil is widely used in aerospace and medical industries, offering excellent strength and fatigue resistance for springs, fasteners, turbine components, and more. Its corrosion resistance makes it ideal for seawater and chemical processing applications.
Product Images
Hot-rolled 630 stainless steel coils ready for shipment
Professional infographic 630 stainless steel coil data sheet + mechanical properties chart
Real-application collage – 630 coils used in aerospace springs, medical instruments, and high-performance components
Why We Are the Best 630 Stainless Steel Coil Distributor
We are the leading 630 stainless steel coil supplier, offering large ready stocks in all conditions, including solution annealed, H900, H925, and H1150M. Our state-of-the-art facilities include in-house slitting, bright annealing, and precision cutting, allowing us to deliver the highest quality products with the fastest turnaround times.
Packaging & Delivery Standards
We use export-standard wooden saddles, VCI paper for corrosion protection, and steel edge protection to ensure that our 630 stainless steel coil reaches you in perfect condition. All products are shipped with full EN 10204 3.1/3.2 certificates.
FAQ Section
- What is the maximum hardness of 630 stainless steel coil?
- 48 HRC in the H1150M condition.
- Is 630 stainless steel coil magnetic after hardening?
- Yes, it becomes magnetic after hardening.
- 630 vs 17-4PH differences?
- 630 offers higher strength and better machinability than 17-4PH.
- Can 630 coil be welded and what filler?
- Yes, weldable using 17-4PH filler wire.
- Recommended condition for maximum strength?
- H1150M offers the maximum strength.
- Corrosion resistance in chloride environments?
- Good resistance to chlorides and seawater.
- Minimum order quantity?
- Contact us for MOQ details.
- Lead time for H900 condition 630 coil?
- Typically 4–6 weeks.
- Is 630 coil suitable for cryogenic applications?
- Yes, 630 retains good performance at low temperatures.
Conclusion + Urgent Call-to-Action
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