grade 1 vs grade 4 titanium
Nov 27, 2025
In the world of titanium, the "Commercially Pure" (CP) grades are revered for their exceptional corrosion resistance and formability. Among these, Grade 1 and Grade 4 represent two critical ends of the spectrum. While they share a common foundation of purity, their mechanical properties dictate very different applications. Understanding the distinction between them is crucial for selecting the right material for the job.
Grade 1 Titanium: The Epitome of Purity and Formability
Grade 1 is the purest and most ductile grade of titanium. It contains the lowest levels of interstitial elements.
Key Characteristics:
Excellent Ductility and Formability: It can be easily cold-formed, stretched, and bent into complex shapes without cracking. This makes it ideal for intricate sheet metal work.
Ultimate Corrosion Resistance: Its high purity gives it the best possible corrosion resistance among all titanium grades, making it suitable for the most aggressive environments.
Lowest Strength: It has the lowest mechanical strength of the titanium grades.
Common Applications:
Chemical processing equipment exposed to aggressive media.
Marine and offshore components.
Architectural cladding and decorative panels.
Anodizing for jewelry and consumer goods (where purity ensures vibrant colors).
Heat exchanger shells and piping systems where pressure is low.
Grade 4 Titanium: The Strongest of the Pure
Grade 4 is the strongest of the commercially pure titanium grades. Its higher oxygen and iron content provide a significant strength boost over Grade 1, while still retaining good ductility and the excellent corrosion resistance inherent to titanium.
Key Characteristics:
High Strength: It offers the highest strength of the unalloyed grades, providing a much higher load-bearing capacity than Grade 1.
Good Ductility: While not as formable as Grade 1, it still possesses sufficient ductility for many manufacturing processes like cold forming and welding.
Excellent Corrosion Resistance: It retains nearly all the corrosion resistance of purer grades, making it highly durable in harsh environments.
Common Applications:
Medical Implants: Such as orthopedic screws, bone plates, and dental implants, where strength and biocompatibility are critical.
Aerospace fasteners and components requiring high strength-to-weight ratio and corrosion resistance.
Cryogenic vessels and components.
Chemical processing equipment that must withstand higher pressures.
Surgical tooling.
Comparison Table
| Feature | Grade 1 Titanium (CP-1) | Grade 4 Titanium (CP-4) |
|---|---|---|
| Composition | ~99.5% Ti (Lowest Interstitials) | ~99.0% Ti (Highest Interstitials) |
| Tensile Strength (Min) | 240 MPa (35,000 psi) | 550 MPa (80,000 psi) |
| Yield Strength (Min) | 170 MPa (25,000 psi) | 480 MPa (70,000 psi) |
| Key Property | Maximum Ductility & Formability | High Strength (Strongest CP Grade) |
| Corrosion Resistance | Best | Excellent (Slightly less than Grade 1) |
| Weldability | Excellent | Excellent |
| Primary Uses | Chemical tanks, marine parts, architecture. | Medical implants, aerospace fasteners, pressure vessels. |
| Analogy | Soft, Malleable Aluminum | High-Strength, Forgeable Steel |
How to Choose: Grade 1 or Grade 4?
The choice between these two materials is a classic engineering trade-off between formability and strength.
Choose Grade 1 Titanium when:
Corrosion resistance is the absolute top priority in a highly aggressive environment.
You require extreme cold formability for deep drawing, spinning, or complex bends.
The application involves very low mechanical stress and load is not a concern.
Choose Grade 4 Titanium when:
You need significantly higher strength but must retain the superior corrosion resistance of pure titanium.
The component will be under moderate to high stress or pressure (e.g., structural parts, fasteners, implant devices).
You need an excellent balance of strength, ductility, and corrosion resistance for demanding applications like medical or aerospace.
about us
We are a leading manufacturer and exporter specializing in Titanium and Titanium Alloy products. Our company is dedicated to providing a comprehensive range of high-quality titanium solutions for demanding global industries such as Aerospace, Chemical Processing, Medical, Marine Engineering, Power Generation, and Sports Equipment.
Our core export portfolio encompasses the full spectrum of wrought titanium products, including:
Titanium Tubes & Pipes: From precision Thin-Walled Titanium Tubes for heat exchangers to robust Thick-Walled Titanium Pipes for high-pressure applications.
Titanium Plates & Sheets: Supplied as Titanium Plates for heavy-duty construction and Titanium Sheets / Titanium Foils for precise manufacturing.
Titanium Bars & Rods: We supply Titanium Bars, Titanium Rods, and Titanium Wires in various diameters and finishes.
Titanium Fasteners: A complete range of Titanium Fasteners including bolts, nuts, and studs.
We expertly process all common grades to meet diverse operational requirements, including:
Commercially Pure Titanium: Gr1, Gr2
Titanium Alloys: Gr5 (Ti-6Al-4V), Gr7, Gr9 (Ti-3Al-2.5V), Gr12
Our production and quality assurance strictly adhere to international standards such as ASTM B265, ASTM B337, ASTM B338, ASTM B348, ASME SB-363, and AMS 4902, ensuring superior performance, excellent corrosion resistance, and high strength-to-weight ratio in every product.
Leveraging our advanced manufacturing expertise and stringent quality control, we are your trusted global partner for reliable, high-performance titanium materials.
