Titanium Grade 4 Round Bar
➡️ Ti Grade 4 | UNS R50700 | W.Nr. 3.7065
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Titanium
UNS Number:
R50700
Wr. No.:
3.7065
MTC Available:
EN 10204 3.1
Product Description for Titanium Grade 4 Round Bar
Titanium Grade 4 Round Bar is a solid cylindrical bar produced from commercially pure titanium UNS R50700. Bar and billet are supplied to ASTM B348 / B348M, with forgings covered by ASTM B381 and the ASME designation SB348 applying to pressure service. The material number is 3.7065.
Grade 4 is the strongest of the four commercially pure titanium grades, permitting up to 0.40% oxygen and 0.50% iron. These limits give a minimum tensile strength of 550 MPa, a minimum 0.2% yield strength of 483 MPa and a minimum elongation of 15%. It provides strength comparable to many austenitic stainless steels at roughly half the density, while retaining the corrosion resistance and weldability of unalloyed titanium.
Corrosion resistance is essentially the same as the lower grades, deriving from a stable, self-healing titanium dioxide film. The material resists seawater, chlorides, wet chlorine, hypochlorite, nitric acid and a broad range of oxidising media, and is immune to chloride stress-corrosion cracking.
Bar is supplied annealed in diameters from about 6 mm to 200 mm and lengths of 3 to 6 m. The alpha structure cannot be strengthened by heat treatment, so annealing serves only to recrystallise and restore ductility. The higher interstitial content reduces cold formability relative to Grades 1 and 2, so generous bend radii are required.
Typical applications include dental and orthopaedic implants, surgical instruments, aerospace fittings and fasteners, cryogenic vessels, high-strength chemical process hardware, marine and offshore components, and hydraulic tube fittings. Industries served include medical and dental device manufacture, aerospace, chemical processing, marine and desalination.
Common Applications of Titanium Grade 4 Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for Ti Gr 4 Round Bar
Standard
Country / Region
Grade
ASTM B348 / B348M
USA
Grade 4 (UNS R50700) - bars and billets
ASME SB348
USA
SB348 Grade 4
ASTM B381
USA
Grade F-4 - forgings
DIN 17860 / DIN 17862
Europe / EU
Ti4 (3.7065)
JIS H4650
Japan
Class 4
GB/T 2965
China
TA4
ISO 5832-2
International
Commercially pure titanium, unalloyed grade 4 - surgical implant applications
Technical Specification for Titanium Grade 4 Round Bar
Specification
Value
Unit
Material
Commercially pure titanium
-
Grade
Titanium Grade 4 / UNS R50700 / 3.7065
-
Product Form
Round bar / rod / billet
-
Standard
ASTM B348 / B348M and ASME SB348
-
Diameter
6 - 200 (available range)
mm
Length
3 - 6 (standard random or fixed)
m
Manufacturing Process
Hot rolled, forged, or hot rolled and cold drawn
-
Production Route
Vacuum arc remelting of titanium sponge, hot working, annealing, pickling
-
Surface Finish
Hot-finished and pickled, peeled, rough turned, cold-drawn, ground, polished
-
Heat Treatment / Delivery Condition
Annealed
-
Annealing Temperature
650 - 760 then air cool (typical)
deg C
Stress Relief Temperature
480 - 595 (typical)
deg C
Maximum Continuous Service Temperature
300 (typical, oxidising conditions)
deg C
Tolerance Standard
ASTM B348 / B348M
-
Density
4.51 (typical)
g/cm3
Melting Point
1668 (approximate)
deg C
Thermal Conductivity
15.6 at 20 deg C (typical)
W/m.K
Coefficient of Thermal Expansion
8.6 at 20 - 100 deg C (typical)
micro-m/m.K
Specific Heat
523 at 20 deg C (typical)
J/kg.K
Electrical Resistivity
0.60 (typical)
micro-ohm.m
Modulus of Elasticity
105 (typical)
GPa
Magnetic Properties
Non-magnetic
-
Applicable Testing Standard
ASTM E8 / E8M, ASTM E120, ASTM E1409, ASTM E1447, ASTM E2371
-
Certification / Inspection Documents
EN 10204 Type 3.1 or 3.2 mill test certificate
-
Technical Specifications
Get the key technical specifications for Titanium Grade 4 Round Bar
Titanium Grade 4 Round Bar is supplied to ASTM B348 / B348M for titanium and titanium alloy bars and billets, adopted by ASME as SB348 for pressure applications. Forgings are covered by ASTM B381 as Grade F-4. Where the bar is used for surgical implants, ISO 5832-2 or ASTM F67 applies and adds requirements for microstructure, grain size and cleanliness.
Bar is supplied annealed, typically at 650-760 deg C followed by air cooling. Grade 4 is a single-phase alpha titanium and is not hardenable by heat treatment. Stress relief at 480-595 deg C is used after machining or forming.
Cold formability is the most noticeable practical limitation. With oxygen up to 0.40%, elongation falls to a minimum of 15% and springback is high, so bend radii must be generous and severe cold forming operations are best carried out on a lower grade or with intermediate annealing.
Machining requires sharp tooling, low cutting speeds, heavy positive feeds, rigid setups and flood coolant. Fine chips and grinding dust are pyrophoric and must be controlled.
Welding by GTAW, GMAW, plasma or electron beam is practical provided the weld pool, root and cooling metal are fully shielded with inert gas. Grade 4 is somewhat more sensitive to interstitial pickup than the lower grades because it already sits close to the interstitial ceiling.
Testing includes tensile testing to ASTM E8 / E8M and interstitial gas analysis for oxygen, nitrogen and hydrogen.
Chemical Composition for Titanium Grade 4 Round Bar
Element
Symbol
Min
Max
Unit
Nitrogen
N
-
0.05
%
Carbon
C
-
0.08
%
Hydrogen
H
-
0.015
%
Iron
Fe
-
0.50
%
Oxygen
O
-
0.40
%
Residual elements, each
-
-
0.10
%
Residual elements, total
-
-
0.40
%
Titanium
Ti
Balance
Balance
%
Chemical Composition
View the chemical composition and applicable material limits for Ti Gr 4 Round Bar
Titanium Grade 4 is unalloyed, and its high strength comes entirely from controlled interstitial and substitutional content rather than from alloying additions.
Oxygen at 0.40% maximum is the highest permitted in the commercially pure family and is the principal source of the grade’s strength. Oxygen occupies interstitial sites in the hexagonal alpha lattice and impedes dislocation movement very effectively, so the increase from 0.35% in Grade 3 to 0.40% raises minimum tensile strength from 450 MPa to 550 MPa. The corresponding cost is reduced ductility, with minimum elongation falling to 15%.
Iron at 0.50% maximum is also the highest of the family. Iron is a substitutional beta stabiliser that contributes to strength by promoting a small amount of beta phase at grain boundaries. The higher limit slightly reduces corrosion performance relative to Grade 1, though for practical purposes the difference is small in most service environments.
Nitrogen at 0.05% maximum strengthens hard but embrittles fast, so the limit stays tight even in this grade.
Hydrogen at 0.015% maximum is restricted because it forms brittle titanium hydride platelets that cause delayed failure under sustained load. Control is particularly important in a grade already near its ductility limit.
Carbon at 0.08% maximum is a processing residual. Other residual elements are limited to 0.10% each and 0.40% in total, with titanium making up the balance.
Mechanical Properties for Titanium Grade 4 Round Bar
Mechanical Property
Value
Unit
Tensile Strength
550 (minimum, annealed)
MPa
Yield Strength 0.2% Offset
483 (minimum, annealed)
MPa
Elongation in 4D or 50 mm
15 (minimum, annealed)
%
Reduction of Area
25 (minimum, annealed)
%
Hardness
Not specified by ASTM B348
HBW
Impact / Charpy V-Notch
Not required by ASTM B348 unless specified
J
Modulus of Elasticity
105 (typical)
GPa
Mechanical Properties
Check the key mechanical properties and performance requirements of Ti Gr 4 Round Bar
The values listed are the requirements of ASTM B348 / B348M for Titanium Grade 4 bar in the annealed condition. Minimum tensile strength is 550 MPa, minimum 0.2% offset yield strength is 483 MPa, and minimum elongation in 50 mm is 15%. Testing follows ASTM E8 / E8M.
All four values are minima under B348 Table 2. Note that reduction of area drops to 25% here against 30% for Grades 1 to 3, which is the clearest sign in the table that the extra oxygen has cost ductility. B348 sets no maximum on yield strength and no hardness requirement.
Grade 4 is single-phase alpha titanium and cannot be strengthened by heat treatment. Annealing recrystallises and restores ductility, and stress relief at 480-595 deg C removes residual stress without significant strength change.
In practical terms the grade offers strength comparable to many austenitic stainless steels at roughly 56% of the density, with far better chloride resistance. Against Ti-6Al-4V it is weaker but easier to weld and less costly.
The modulus of elasticity of about 105 GPa is roughly half that of steel, so stiffness-driven designs must allow for approximately twice the deflection, and galling against itself or other metals requires anti-seize treatment on threads and sliding surfaces.
Dimension / Sizes for Titanium Grade 4 Round Bar
Dimension / Size
Value
Unit
Diameter (available range)
6 - 200
mm
Standard Length
3 - 6
m
Custom Length
Cut to length on request
-
Diameter Tolerance
Per ASTM B348 / B348M
-
Length Tolerance
Per ASTM B348 / B348M or as agreed
-
Straightness Tolerance
Per ASTM B348 / B348M or as agreed
-
End Condition
Square cut, saw cut, chamfered or as ordered
-
Surface Finish
Hot-finished and pickled, peeled, rough turned, cold-drawn, ground, polished
-
Cut-to-Length Availability
Available
-
Dimensional Standard
ASTM B348 / B348M
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for Ti Gr 4 Round Bar
Pricing for Titanium Grade 4 Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
Get current Titanium Grade 4 Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
What is Titanium Grade 4 Round Bar?
What standard does Titanium Grade 4 Round Bar comply with?
What is the difference between Titanium Grade 4 and Grade 2?
Why is Grade 4 used for dental implants?
What are the key mechanical properties of Titanium Grade 4?
Can Titanium Grade 4 be hardened by heat treatment?
How well does Titanium Grade 4 form and weld?
What sizes and finishes are available?
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