640 Stainless Steel Fittings: High-Strength, Corrosion-Resistant, Precision Engineered for Demanding Applications
Meta Description: Discover high-strength 640 stainless steel fittings with superior corrosion resistance. Ideal for oil & gas, aerospace, and medical applications. Explore our comprehensive range of 640 stainless steel pipe fittings, buttweld, threaded, and socket weld fittings at unbeatable prices.
Introduction
640 Stainless Steel Fittings are designed for extreme performance in the most demanding environments. These precipitation-hardening stainless steel fittings combine exceptional strength—up to 1350 MPa—with outstanding corrosion resistance, making them ideal for industries such as aerospace, oil & gas, medical, and petrochemical.
640 stainless steel belongs to the family of precipitation-hardening alloys that are specifically engineered to withstand harsh conditions. The unique combination of strength and corrosion resistance makes it far superior to grades like 17-4PH and 630 stainless steel, especially in challenging environments like high-pressure systems, nuclear reactors, and offshore platforms. The high tensile strength and fatigue resistance of 640 stainless steel fittings ensure that they maintain structural integrity in dynamic and vibrating environments, ensuring long-lasting and reliable performance.
At [Your Company Name], we are recognized as one of the best 640 stainless steel fittings suppliers, offering a comprehensive range of buttweld, threaded, and socket weld fittings at competitive prices. Our products are tailored to meet the specific needs of industries that require precision-engineered solutions.
Product Overview & Superior Advantages
- High Strength: With a tensile strength of up to 1350 MPa, 640 stainless steel fittings offer unmatched performance for high-pressure systems, oil & gas operations, and aerospace applications.
- Superior Corrosion Resistance: Ideal for sour gas environments, marine applications, and chemical processing, 640 stainless steel provides resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC).
- Fatigue Resistance: The precipitation-hardening process increases the material’s ability to withstand fatigue in dynamic environments, such as high-performance turbines, valve systems, and rotating equipment.
- Versatile Heat Treatment: 640 stainless steel can be heat-treated to achieve optimal mechanical properties, such as H900, H925, and H1025, allowing customization for various engineering needs.
- Machinability: 640 stainless steel fittings offer excellent machinability in the annealed condition, which makes them suitable for precise customizations and quick fabrication.
Key Advantages:
- Enhanced Performance: Ideal for critical applications such as high-pressure hydraulic fittings, medical instrument connections, and turbine casings.
- Wide Range of Applications: From oil wellheads to nuclear reactor components, 640 stainless steel fittings are trusted across industries that demand high-quality materials.
- Custom Sizes and Configurations: Whether you need elbows, tees, or caps, our 640 stainless steel fittings come in various sizes and pressure ratings, ensuring the perfect fit for your projects.
- Compliance with Global Standards: Our fittings meet key industry standards including ASTM A403 WP640, A182 F640, ASME B16.9, and MSS SP-43, ensuring superior quality and performance.
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Chromium (Cr) | 14–15.5 |
| Nickel (Ni) | 3.5–5.5 |
| Copper (Cu) | 2.5–4.5 |
| Niobium + Tantalum (Nb + Ta) | 0.15–0.45 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Carbon (C) | ≤ 0.07 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.03 |
640 stainless steel (UNS S15500) is a precipitation-hardening alloy designed for optimal performance in demanding applications. The alloy’s high chromium content ensures excellent resistance to oxidation and corrosion, while the inclusion of niobium and tantalum enhances strength and durability in high-temperature environments.
Mechanical Properties
| Condition | Yield Strength (MPa) | Ultimate Tensile Strength (MPa) | Elongation (%) | Hardness (HRC) |
|---|---|---|---|---|
| Solution Annealed | 725 | 930 | 25 | 30–35 |
| H900 | 860 | 1050 | 20 | 33–38 |
| H925 | 900 | 1100 | 18 | 35–40 |
| H1025 | 1020 | 1200 | 15 | 38–42 |
| H1150 | 1060 | 1300 | 12 | 40–44 |
| H1150M | 1100 | 1350 | 10 | 42–45 |
The mechanical properties of 640 stainless steel fittings make them ideal for high-pressure and high-strength applications. The solution annealed condition offers moderate strength, while the H1150M condition maximizes tensile strength up to 1350 MPa, ensuring the fittings can withstand extreme environments such as oil & gas platforms and aerospace systems.
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.75 |
| Thermal Conductivity (W/m·K) | 16.3 |
| Magnetic (after hardening) | Yes |
640 stainless steel fittings have a density of 7.75 g/cm³ and a thermal conductivity of 16.3 W/m·K, making them suitable for applications involving thermal cycling and high-temperature exposure. The magnetic properties after hardening allow for specific uses in industrial systems where magnetic properties are required.
640 vs 630 vs 17-4PH vs 304 vs 316 vs 410 Fittings Comparison
| Property | 640 Stainless Steel Fittings | 630 Stainless Steel Fittings | 17-4PH Stainless Steel Fittings | 304 Stainless Steel Fittings | 316 Stainless Steel Fittings | 410 Stainless Steel Fittings |
|---|---|---|---|---|---|---|
| Yield Strength (MPa) | 800–1100 | 900–1050 | 550–1000 | 210–250 | 290–320 | 450–550 |
| Corrosion Resistance | Excellent | Good | Excellent | Moderate | Excellent | Good |
| Hardness (HRC) | 33–45 | 28–44 | 30–40 | 15–30 | 20–35 | 30–45 |
| Heat Treatment | H900, H925, H1025, H1150M | H900, H925 | H900, H925 | Annealed | Annealed | H900, H925 |
| Cost | Moderate | Moderate | High | Low | High | Low |
640 stainless steel fittings excel in strength and corrosion resistance compared to 304, 316, and 410 grades. The precipitation hardening process makes 640 superior in high-performance applications, especially in industries that require high strength-to-weight ratios, such as aerospace and oil & gas.
Available Types & Specifications
| Type | Size (Inches) | Pressure (PSI) | Standards | Surface Finish |
|---|---|---|---|---|
| Buttweld Seamless & Welded | 1/2″–48″ | Sch 10S–XXS | ASTM A403 WP640, ASME B16.9 | Pickled, Bright Annealed, Polished |
| Forged Threaded & Socket Weld | 1/8″–4″ | 2000#–9000# | ASTM A182 F640, ASME B16.11 | Pickled, Bright Annealed |
Our 640 stainless steel fittings come in a range of sizes and pressure ratings to suit any project. From elbows, tees, and reducers to caps and stubs, we offer customizable fittings designed to meet your exact specifications.
Heat Treatment & Precipitation Hardening Guide
- Solution Annealing: 1038°C
- Aging Conditions: H900, H925, H1025, H1150M
- Achievable Hardness: 28–44 HRC
The **precipitation hardening
process** increases the strength of **640 stainless steel fittings**, ensuring they provide exceptional performance in demanding environments. Whether you need the **H900** condition for moderate strength or the **H1150M** for maximum hardness, we provide customized solutions tailored to your application.
## Major Applications
* **Oil & Gas**: Wellhead fittings, downhole tool fittings
* **Aerospace**: Structural fittings, turbine casings
* **Medical**: Instrument connections, high-pressure valve systems
* **Nuclear**: Reactor components, turbine casings
* **Petrochemical**: High-pressure piping, pressure vessel components
## Exactly THREE Image Placeholders
* **Image 1**: **Polished 640 stainless steel buttweld elbows and tees in H900 condition ready for export**
* **Image 2**: **Professional infographic 640 stainless steel fittings data sheet + strength vs aging temperature curve**
* **Image 3**: **Real-installation collage – 640 fittings used in oil & gas Christmas trees, pump shafts, aerospace brackets, and high-pressure valve systems**
## Why We Are the Best 640 Stainless Steel Fittings Distributor
* **Largest stock** of **640 fittings** in all conditions.
* **Direct mill relationships** for unbeatable pricing.
* **In-house heat treatment** and **polishing** capabilities.
* **Comprehensive quality testing**: **100% PMI**, **ultrasonic**, and **hardness testing**.
* **Full certifications**: EN 10204 3.1/3.2, PED, NACE MR0175.
* **Precision machining**, **custom fabrication**, and **small-batch production**.
## Packaging & Quality Standards
Our **640 stainless steel fittings** are packaged with the utmost care to prevent damage during transport. Each fitting is individually **wrapped in plastic**, and the components are securely placed in **wooden cases** to ensure they arrive at your location in perfect condition. We provide all relevant **certification** and **documentation** upon request.
## FAQ Section
1. **What is the maximum hardness of 640 stainless steel fittings?**
2. **Is 640 stainless steel fittings magnetic after hardening?**
3. **640 vs 17-4PH differences & when to choose 640**
4. **Can 640 fittings be welded and what filler?**
5. **Recommended condition for maximum strength (H900)**
6. **Corrosion resistance in chloride or sour service environments**
7. **NACE MR0175 / ISO 15156 compliance**
8. **Minimum order quantity**
9. **Lead time for Sch 80 buttweld 640 elbows**
10. **Can 640 fittings be polished to mirror finish?**
11. **Is 640 fittings suitable for cryogenic applications?**
12. **Typical applications in oil & gas**
## Conclusion + Urgent Call-to-Action
For a fast and reliable solution for your **640 stainless steel fittings**, **request a quote** today. **Instant quotes** available within an hour! Our team is available **24/7** via **WhatsApp**, **email**, **phone**, and **live chat**.