631 Stainless Steel Plate: Superior Strength and Corrosion Resistance for Demanding Applications
Meta Description: Discover 631 stainless steel plate with excellent corrosion resistance, strength up to 1650 MPa, and superior fatigue performance. Ideal for aerospace, medical, and high-performance structural applications.
Introduction
631 Stainless Steel Plate is a semi-austenitic precipitation-hardening stainless steel that offers the highest strength among precipitation-hardening grades (up to 1650 MPa). It combines outstanding mechanical properties with excellent corrosion resistance, making it a perfect choice for aerospace, medical, and high-performance structural applications. The versatility of 631 stainless steel plate in demanding industries such as aerospace, defense, and medical devices stems from its ability to maintain high strength and fatigue resistance while offering excellent resistance to corrosion in harsh environments.
Unlike standard 304 or 316 stainless steel, 631 stainless steel can be hardened through a precipitation hardening process, which not only increases its strength but also enhances its fatigue resistance and machinability. The ability to undergo heat treatment such as RH950, CH900, and TH1050 makes it highly versatile for high-performance applications where both strength and corrosion resistance are required.
At [Your Company Name], we are proud to be one of the leading 631 stainless steel plate suppliers, offering the best quality plates at competitive prices, with quick global delivery and customization options. Whether you need plates for aerospace structural components, medical instruments, or high-performance springs, we have the expertise and stock to meet your needs.
Product Overview & Key Advantages
- Highest Strength Among PH Grades: With a tensile strength of up to 1650 MPa, 631 stainless steel plate offers exceptional strength, ideal for demanding structural components in aerospace and defense.
- Superior Corrosion Resistance: 631 stainless steel provides outstanding resistance to corrosive environments, making it perfect for applications in medical devices, turbine components, and chemical processing.
- Excellent Fatigue Performance: With enhanced fatigue resistance, 631 stainless steel plate ensures long-lasting performance even in dynamic loading applications, such as aerospace brackets and high-pressure springs.
- Versatility in Heat Treatment: The ability to undergo multiple heat treatments like RH950, CH900, and TH1050 enables users to tailor the material properties to suit specific engineering needs, ensuring optimal strength and durability.
- Machinability in Annealed Condition: In its annealed condition, 631 stainless steel plate offers excellent machinability, allowing for precise cutting, shaping, and finishing to meet your custom requirements.
Detailed Advantages:
- High Strength-to-Weight Ratio: 631 stainless steel provides high strength while maintaining a lightweight profile, making it ideal for applications where weight reduction is crucial, such as aircraft components and surgical tools.
- Fatigue Resistance for High-Performance Applications: Its fatigue resistance makes 631 stainless steel plate the preferred choice for applications that are subjected to cyclic loading or vibration.
- Versatility in Industries: Ideal for use in industries like aerospace, medical, nuclear, automotive, and oil & gas, 631 stainless steel offers versatility in highly demanding and specialized environments.
- Global Compliance: Plates meet the ASTM A240 and ASME SA240 standards, ensuring consistent quality and performance across all industries.
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Chromium (Cr) | 16–18 |
| Nickel (Ni) | 6.5–7.75 |
| Aluminum (Al) | 0.75–1.5 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Carbon (C) | ≤ 0.07 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.03 |
631 stainless steel plate (UNS S17700) has a semi-austenitic structure that incorporates chromium, nickel, and aluminum, combined with low carbon levels, to enhance corrosion resistance and allow for precipitation hardening. This composition delivers a unique combination of high strength, durability, and resistance to oxidation and sulfur contamination, ideal for extreme applications.
Mechanical Properties
| Condition | Yield Strength (MPa) | Ultimate Tensile Strength (MPa) | Elongation (%) | Hardness (HRC) |
|---|---|---|---|---|
| Solution Annealed | 850 | 1050 | 25 | 30–35 |
| RH950 | 950 | 1150 | 20 | 35–40 |
| CH900 | 900 | 1100 | 15 | 38–42 |
| TH1050 | 1050 | 1250 | 10 | 40–45 |
| TH1100 | 1100 | 1300 | 5 | 42–48 |
631 stainless steel plate exhibits superior yield strength and tensile strength in its hardened conditions, with hardness levels reaching up to 48 HRC in TH1100. This makes it ideal for high-stress applications such as aerospace structural components and medical device manufacturing.
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.75 |
| Thermal Conductivity (W/m·K) | 16.3 |
| Magnetic (after hardening) | Yes |
The density of 631 stainless steel plate is 7.75 g/cm³, with a thermal conductivity of 16.3 W/m·K, which makes it suitable for applications requiring thermal stability and resistance to thermal cycling. Additionally, 631 remains magnetic after hardening, which is beneficial in certain industrial applications.
631 vs 630 vs 17-7PH vs 304 vs 316 vs 17-4PH Plate Comparison
| Property | 631 Stainless Steel Plate | 17-7PH Stainless Steel Plate | 630 Stainless Steel Plate | 304 Stainless Steel Plate | 316 Stainless Steel Plate | 17-4PH Stainless Steel Plate |
|---|---|---|---|---|---|---|
| Yield Strength (MPa) | 1300 | 1300 | 1000 | 250 | 290 | 1100 |
| Corrosion Resistance | Excellent | Excellent | Good | Good | Excellent | Excellent |
| Hardness (HRC) | 38–48 | 38–44 | 28–44 | 20–30 | 25–35 | 35–40 |
| Heat Treatment | RH950, CH900, TH1050, TH1100 | H900, H925 | H900, H925 | Annealed | Annealed | H900, H925 |
| Cost | Moderate | Moderate | Moderate | Low | High | Moderate |
631 stainless steel plate excels in strength and corrosion resistance compared to 304 and 316 grades, making it ideal for high-performance applications where strength-to-weight ratio and corrosion resistance are critical.
Available Specifications
| Thickness (mm) | Width (mm) | Length (mm) | Finish |
|---|---|---|---|
| 3–100 | 1000–3000 | Up to 12000 | No.1 Hot-Rolled, Pickled, 2B, Polished, Brushed |
631 stainless steel plate is available in a variety of thicknesses, widths, and finishes to meet the needs of aerospace, medical, and high-performance applications. Choose from pickled, bright annealed, and polished finishes for enhanced performance.
Heat Treatment & Precipitation Hardening Guide
- Solution Annealing: 1040°C
- Aging Conditions: RH950, CH900, TH1050, TH1100
- Achievable Hardness: 38–48 HRC
The precipitation hardening process allows 631 stainless steel plate to achieve high hardness and superior mechanical properties, especially in conditions such as CH900 or RH950.
Major Applications
- Aerospace: Structural plates, aircraft components, turbine casings
- Medical: Surgical tools, medical instrument components
* **High-Performance Springs**: For high-stress environments
* **Nuclear**: Reactor parts, fuel cells
* **Chemical Processing**: Pressure vessel shells, pump bodies
* **High-Strength Bellows**: For aerospace and medical devices
## Exactly THREE Image Placeholders
* Image 1: **Polished 631 stainless steel plate in RH950 condition stacked in warehouse**
* Image 2: **Professional infographic 631 stainless steel plate data sheet + strength vs aging temperature curve**
* Image 3: **Real-application collage – 631 plates used in aerospace brackets, medical surgical tools, high-strength springs, and aircraft structural parts**
## Why We Are the Best 631 Stainless Steel Plate Distributor
* **Largest Stock**: **Ready stock** in all **conditions** with fast **global delivery**.
* **Precision Cutting & Beveling**: Customization options for **every need**.
* **Full Quality Testing**: **100% ultrasonic testing**, **PMI testing**, **hardness testing**.
* **Competitive Prices**: Direct relationships with mills for **unbeatable pricing**.
* **Certified Products**: Full **EN 10204 3.1/3.2 certificates**.
## FAQ Section
1. **What is the maximum hardness of 631 stainless steel plate?**
2. **Is 631 stainless steel plate magnetic after hardening?**
3. **631 vs 17-7PH differences (they are the same grade)**
4. **Can 631 plate be welded and what filler?**
5. **Recommended condition for maximum strength (CH900)**
6. **Corrosion resistance in chloride environments**
7. **Minimum order quantity**
8. **Lead time for RH950 condition 631 plate**
9. **Is 631 plate suitable for cryogenic applications?**
## Conclusion + Urgent Call-to-Action
For **high-performance** and **reliable** **631 stainless steel plates**, **request a quote today**. We offer **fast responses** and **global delivery**. Contact us via **WhatsApp**, **email**, or **phone** to get started.