What Are Titanium Grades? – A Complete Guide

2025-07-18

Titanium is a lightweight, high-strength, and corrosion-resistant metal used in aerospace, medical, chemical, and industrial applications. To meet different performance needs, titanium is classified into grades based on composition and mechanical properties.

The most commonly used titanium grades include

1. Commercially Pure (CP) Titanium (Grades 1-4)

Grade 1: Softest & most ductile (lowest strength, highest corrosion resistance) – used in chemical processing & marine applications.
Grade 2: Most common CP titanium – balanced strength & formability (medical implants, aerospace components).
Grade 3: Higher strength than Grade 2 – used in pressure vessels & structural parts.
Grade 4: Strongest CP titanium – used in surgical devices & high-stress applications.

2. Titanium Alloys (Grades 5, 7, 9, 12, 23, etc.)

Grade 5 (Ti-6Al-4V): The most widely used titanium alloy (90% of applications). High strength, heat resistance – aerospace, medical implants, military.
Grade 7 (Ti-0.15Pd): Enhanced corrosion resistance (chemical processing, marine environments).
Grade 9 (Ti-3Al-2.5V): Lightweight & strong – used in aircraft tubing, sports equipment.
Grade 12 (Ti-0.3Mo-0.8Ni): Excellent weldability & heat resistance (heat exchangers, hydrometallurgical applications).
Grade 23 (Ti-6Al-4V ELI): Medical-grade version of Grade 5 – superior biocompatibility (bone implants, surgical tools).

Characteristics of Grade 1 Titanium

High Ductility:

Grade 1 titanium is very flexible and can be easily formed into different shapes. This makes it ideal for products that need to be bent or molded.

Excellent Corrosion Resistance:

This grade resists corrosion exceptionally well. It can withstand exposure to saltwater and various chemicals without deteriorating, making it perfect for harsh environments.

Low Strength:

Compared to other titanium grades, Grade 1 has lower strength. It is not the best choice for applications that require high mechanical strength.

Biocompatibility:

Grade 1 titanium is safe for use in the human body. It doesn’t cause adverse reactions, making it suitable for medical implants and devices.

Characteristics of Grade 2 Titanium

Moderate Strength:

Grade 2 titanium has higher strength than Grade 1, making it more suitable for applications that require a bit more durability.

Excellent Corrosion Resistance:

Like Grade 1, Grade 2 titanium resists corrosion in many environments, including seawater and various chemicals. This property ensures long-term performance and reliability.

Good Ductility:

While it is not as ductile as Grade 1, Grade 2 titanium can still be easily formed and shaped. It offers a good balance between strength and flexibility.

Good Weldability:

Grade 2 titanium is easy to weld, making it a convenient choice for manufacturing and fabrication processes.

Characteristics of Grade 3 Titanium

High Strength:

Grade 3 titanium is much stronger than Grades 1 and 2. This makes it suitable for uses where durability and toughness are important.

Good Flexibility:

Even though it is strong, Grade 3 titanium can still be easily shaped and formed, making it versatile.

Excellent Corrosion Resistance:

Like other titanium grades, Grade 3 resists corrosion in various environments, including seawater and harsh chemicals.

Good Weldability:

Grade 3 titanium can be welded easily, which is important for many manufacturing processes.

Characteristics of Grade 4 Titanium

High Strength:

Grade 4 titanium is the strongest of all commercially pure titanium grades. It provides great strength for its weight, which is important in demanding uses.

Good Corrosion Resistance:

Like other pure titanium grades, Grade 4 resists corrosion well in various environments, including in seawater and chemicals.

Moderate Flexibility:

While not as easy to shape as Grades 1 and 2, Grade 4 titanium is still flexible enough for forming into different shapes.

Weldability:

It can be welded easily using standard methods, which is essential for making complex parts and structures.

Characteristics of Grade 5 Titanium (Ti-6Al-4V)

High Strength:

Ti-6Al-4V is very strong, comparable to some types of steel, but much lighter. This makes it ideal for applications where strength is important, but weight needs to be minimized.

Good Corrosion Resistance:

It holds up well against corrosion in various environments, including seawater and chemicals. This durability ensures it lasts a long time even in tough conditions.

Lightweight:

Despite being strong, Ti-6Al-4V is lightweight. This makes it perfect for industries like aerospace, where reducing weight is crucial for fuel efficiency and performance.

Can Handle High Temperatures:

It remains strong even when exposed to high temperatures, making it useful in environments where heat is a factor.

Characteristics of Grade 7 Titanium

Superior Corrosion Resistance：

Resists pitting, crevice corrosion, and reducing acids (e.g., sulfuric, hydrochloric) better than standard CP titanium.

Palladium (0.15%) enhances resistance to oxidizing and chloride-rich environments.

Excellent Weldability & Fabrication：

Can be welded using standard methods (TIG, plasma, laser) without cracking.

Good cold-forming properties (similar to Grade 2 titanium).

Mechanical Properties

Tensile Strength: ~345 MPa (50 ksi)

Yield Strength: ~275 MPa (40 ksi)

Elongation: 20% (ductile and machinable)

Biocompatibility

Non-toxic and biocompatible (used in medical implants where corrosion resistance is critical).

Thermal Stability

Performs well in temperatures up to 300°C (570°F).

How to Choose the Right Titanium Grade?

Corrosion Resistance? → Grades 1, 2, 7, 12

High Strength? → Grades 4, 5, 9

Medical Implants? → Grades 2, 5, 23

Aerospace & Military? → Grades 5, 9, 19

Need Titanium Products?

Having explored the characteristics of different titanium alloys, select the optimal grade for your application. Lork Group, a trusted titanium alloy supplier, provides high-quality materials—contact us for technical specifications and pricing.

We supply all titanium grades in bars, sheets, tubes, and custom machined parts. Contact us today for specs & pricing!

Website：+86 17513081871

Email：daisy@lorkgroup.com

What is Inconel 600 used for Lork Group - Premium Nickel Alloy Solutions

The Critical Role of Nickel-Based High-Temperature Alloys in Gas Turbines