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Titanium Grade 3-3.7055-UNS R50550

Ti Grade 3 (CP Titanium Grade 3) is one of the higher-strength grades in the commercially pure titanium series. While maintaining good corrosion resistance, it provides higher mechanical strength compared with lower CP titanium grades. This material is suitable for applications that require greater strength while still demanding excellent corrosion resistance, and it performs particularly well in chemical processing, marine engineering, and high-pressure industrial equipment.

ISO 5832-2：
Implants for surgery — Metallic materials — Part 2: Unalloyed titanium
ASTM B348：
Standard Specification for Titanium and Titanium Alloy Bars and Billets
ASTM F67：
Standard Specification for Unalloyed Titanium for Surgical Implant Applications

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Chemical Composition

Element	N	C	H	Fe	o	Ti
Content (%)	≤0.05	≤0.08	≤0.0125a	≤0.30	≤0.35	balance

Heat Treatment Conditions and Mechanical Properties

Condition	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation（4D）	Reduction of Area（%）	Hardness (HV10)
Annealed	≥450	≥380	≥18	≥30	≥150

Supply Forms

Available Form	Size Range	Surface Finish	Length (Customizable)	Tolerance (Customizable)	Delivery Condition
Plate	T0.5-T200.0mm	Milled	L:200/250/300W:200/300/500/1000	-0.0/+1.0mm	Annealed
Bar	φ1.0-φ200.0mm	Ground / Precision Ground	3M/PCS	h6-h9	Annealed
Wire	φ1.0-φ3.0mm	Ground / Precision Ground	1M/PCS	h6-h9	Annealed
Tube	OD：1.0-10.0mmID:0.08mm-2.0mm	Ground / Precision Ground	3M/PCS	h6-h9	Annealed

Datasheet

Additional Info

A Brief History of Grade 3 Titanium

Grade 3 Titanium, also known as Titanium Grade 3, CP Titanium Grade 3, UNS R50550 or 3.7055, is a commercial pure titanium material.

Within the commercial pure titanium system, Grade 3 Titanium has a higher strength than Grade 1 and Grade 2, and is classified as a pure titanium grade with greater engineering strength. It is not a titanium alloy and does not rely on alloying elements such as aluminium or vanadium for strengthening.

Grade 3 Titanium retains the corrosion resistance and weldability of commercial pure titanium, whilst offering higher mechanical strength than the commonly used Grade 2. It is suitable for corrosion-resistant titanium components that require higher strength but do not necessitate the use of titanium alloys.

How was the Grade 3 Titanium developed

The development of Grade 3 Titanium arose from the demand for higher strength in engineering applications of commercial pure titanium.

In the early days, when commercial pure titanium was used in chemical, marine, medical and industrial equipment, its corrosion resistance and weldability were its primary advantages. However, as application scenarios expanded, certain components required not only corrosion resistance but also higher strength and better structural stability.

Grade 1 and Grade 2 can meet many corrosion resistance and forming requirements, but in pressure vessels, piping systems, thicker structural components, marine parts and certain medical structural components, material strength sometimes needs to be further increased.

Whilst titanium alloys can provide higher strength, this entails increased complexity in material systems, processing difficulties, procurement costs and project requirements. Many components still require the corrosion resistance, weldability and relatively simple material system of commercial pure titanium.

Grade 3 Titanium was developed to address this need. By controlling the content of oxygen, iron, nitrogen, carbon and hydrogen, it enhances the material’s strength whilst retaining the corrosion resistance and weldability of commercial pure titanium.

Among the various grades of commercial pure titanium, Grade 3 Titanium places greater emphasis on strength than Grade 2, whilst retaining better machinability and weldability than Grade 4. Consequently, it is frequently used in projects requiring high strength but where the use of non-alloyed pure titanium is preferred.

Early Applications of Grade 3 Titanium

In its early stages, Grade 3 Titanium was primarily used for industrial components requiring high strength and corrosion resistance.

Common early applications included chemical processing equipment components, heat exchanger components, piping systems, pressure vessel components, corrosion-resistant structural components, seawater system components and welding equipment parts.

These applications typically required the material to remain stable in corrosive environments, whilst offering superior structural strength and engineering reliability compared to standard low-strength pure titanium materials.

Current Applications of Grade 3 Titanium

Grade 3 Titanium is currently primarily used for commercial pure titanium components that require strength, corrosion resistance and weldability.

Common applications include:

Medical applications: orthopaedic fixation plates, bone screws, craniofacial fixation plates, medical structural components, dental implant-related components, small titanium parts for dental restorations, dental instrument parts and medical device components. Implant-related projects must be verified in accordance with ASTM F67, ISO 5832-2, drawing requirements, inspection documentation and end-use specifications.

Aerospace applications: lightweight structural components, brackets, covers, piping components, corrosion-resistant fasteners, non-high-strength titanium alloy load-bearing parts, and commercial pure titanium components requiring higher strength than Grade 2.

Industrial and chemical applications: chemical heat exchangers, pressure vessel components, piping, reactor components, corrosion-resistant liners, electrolysis equipment parts, seawater system components and welded structural components.

Mechanical engineering applications: Corrosion-resistant structural components, fasteners, supports, equipment housings, precision machined parts, fastening-related components, and engineering titanium parts requiring high strength and corrosion resistance.

Sunxin’s Grade 3 Titanium Supply Support

Sunxin supplies Grade 3 Titanium in sheet, bar, wire and tube forms, as well as custom cut sizes.

Supported standards include ISO 5832-2, ASTM B348 and ASTM F67.

Available specifications include: sheets T0.5–T200.0 mm, mill-finished, standard lengths 200 / 250 / 300 mm, widths 200 / 300 / 500 / 1000 mm, tolerances -0.0 / +1.0 mm, supplied in the annealed condition.

Bar specifications: Φ1.0–Φ200.0 mm, surface finish: polished or precision polished, standard length 3 m/piece, tolerances available as h6–h9, supplied in the annealed condition.

Wire specifications: Φ1.0–Φ3.0 mm, surface finish: polished or precision polished, standard length: 1 m per piece, tolerances: h6–h9, supplied annealed.

Tube specifications: outer diameter 1.0–10.0 mm, inner diameter 0.08–2.0 mm, surface finish polished or precision polished, standard length 3 m per piece, tolerances available in h6–h9, supplied in the annealed condition.

Prior to production of Grade 3 Titanium projects, it is recommended to confirm the material form, delivery condition, surface finish, dimensions, tolerances and applicable standards. For medical, chemical, aerospace or other critical applications, strength requirements, welding requirements, corrosive environments, inspection items and quality documentation should also be further confirmed.

Sunxin is certified to the ISO 13485 and ISO 9001 quality management systems. This means we are able to provide your project with rigorous batch management, comprehensive traceability controls, efficient inspection coordination services and full quality documentation support, ensuring that every batch of material you purchase meets the highest standards.

FAQs

Product FAQs

When should Ti Grade 3 be chosen?

When the strength of Ti Grade 2 is insufficient, but you do not wish to use Ti Grade 4—which offers higher strength but is more difficult to machine—Ti Grade 3 serves as a middle ground, striking a balance between strength, corrosion resistance and machinability.

How do you choose between Ti Grade 3 and Ti Grade 2?

If versatility, formability and ease of machining are prioritised for the component, Ti Grade 2 is more suitable.

If the part requires higher strength and load-bearing capacity than Ti Grade 2, Ti Grade 3 is more suitable.

How to choose between Ti Grade 3 and Ti Grade 4?

Ti Grade 4 offers higher strength and is more suitable for high-strength pure titanium parts.

Ti Grade 3 has lower strength than Ti Grade 4, but is relatively easier to machine and form; the corrosion resistance of both is similar.

If the highest strength commercial pure titanium is required, choose Ti Grade 4; if a balance between strength and machinability is required, choose Ti Grade 3.

Can Ti Grade 3 be used as a substitute for Ti Grade 5?

No, it cannot. Ti Grade 3 is a commercial pure titanium, whilst Ti Grade 5 is a titanium alloy.

Ti Grade 3 is more suitable for components requiring both the corrosion resistance of pure titanium and medium to high strength; Ti Grade 5 offers higher strength and is more suitable for titanium alloy components with higher load-bearing, high-strength and structural performance requirements.

Does Ti Grade 3 offer good corrosion resistance?

Yes. Ti Grade 3 has good corrosion resistance and is suitable for corrosion-resistant components in chemical, marine, humid and hot environments, as well as general industrial applications.

Is Ti Grade 3 suitable for marine or chemical equipment?

Yes. Ti Grade 3 can be used for marine, chemical and industrial equipment components that require both corrosion resistance and strength. Compared to Ti Grade 2, it is more suitable for corrosion-resistant parts with higher load-bearing requirements.

Does Ti Grade 3 have good biocompatibility?

Yes. Ti Grade 3 is a commercial pure titanium with good biocompatibility and corrosion resistance, and can be used for certain medical devices and medical-related parts.

Is Ti Grade 3 suitable for complex forming?

It is not recommended as the first choice for complex deep drawing. Ti Grade 3 has higher strength than Ti Grade 1 and Ti Grade 2, and is consequently more difficult to form.

What forms of Ti Grade 3 products can Sunxin supply?

Sunxin can supply Ti Grade 3 titanium plates, bars, wire and tubes. Specific dimensions, tolerances, surface finishes and delivery conditions can be confirmed according to application requirements.

What information is required when purchasing Ti Grade 3?

It is recommended to provide the material standard, product form, dimensions, tolerances, surface finish, delivery condition, quantity and intended use.

If the material is to be used in chemical, marine, high-pressure equipment or medical-related components, it is also recommended to provide drawings, mechanical performance requirements and testing requirements.

Typical Applications

Medical

Higher-strength CP titanium orthopedic parts / Dental parts / Bone plates / Bone screws / Medical device structural parts

Aerospace

Medium-strength brackets / Piping / Fasteners / Hydraulic system parts / Corrosion-resistant structural parts

Industrial

Chemical equipment components / Pressure vessel parts / Heat exchangers / Corrosion-resistant shaft parts

Mechanical engineering

Lightweight load-bearing brackets / Joint connecting plates / Gripper structural parts / Corrosion-resistant mounting bases

Quality Services

ERP system management, full process traceability, and good batch stability.

Furnace numbering management ensures good material consistency.

Supports third-party testing and provides reports.

Chemical composition analysis (spectrometer analysis/oxygen, nitrogen, and hydrogen analyzer)

Mechanical properties (electronic tensile testing machine/Rockwell & Vickers hardness tester/impact testing machine)

Flaw detection (UT flaw detection)

Tissue examination (metallurgical microscope/electron microscope)

Heat treatment verification

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Manufacturing services

Precision Tolerance Control

Tolerances customized (H6-H9 grade)

Cut-to-Size Service

Length and width customized (0.1M-3M or slit/cut to order)

CNC Pre-Machining

chamfering/face treatment/grinding/turning/milling

Custom Dimensions Available

Custom sizes available (any non-standard dimensions can be customized)

Dimensional and Precision Control

straightness/roundness/coaxiality/dimensional tolerance records

Customized Heat Treatment

providing heat treatment based on material properties to achieve the desired delivery condition

Surface Control

roughness/fine grinding/film application on substrate

Marking and Coding Services

laser marking/inkjet coding

Shipping Packaging

Custom Size/Separate Boxes/Long-Distance Transportation

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Engineering and Technical Support Services

Explore Engineering Support

Support for medical industry applications

Supports OEM/OEM drawing processing

Material selection and alternative solutions

Tool Selection

Customized heat treatment solutions

Cost optimization

Industry-supporting resource consulting

Business & Supply Chain Services

Free samples, rapid verification

Comprehensive Product Range:We offer a wide range of products and can quickly provide samples that meet your requirements. Free trials are also available depending on your needs.

Supports small batch production and flexible MOQ

Our comprehensive product range is in stock, which can support small-batch sampling and increase flexibility.

24-Hour Quotation Response

An excellent sales and technical support team is available to provide you with dedicated service 24 hours a day.

Stable Supply Chain Production System

Stable raw material sources ensure batch consistency control. Safety stock is maintained, and production is managed according to ISO 13485 and ISO 9001 standards.