An engineering resource for global B2B buyers and structural designers. Discover technical specifications, mechanical calculations, seamless vs. welded hollow section manufacturing, custom profile tolerances, and future market dynamics for ASTM B338/B861 Grade 2, Grade 5 (Ti-6Al-4V), and Grade 9 Titanium Square Tubing.
In modern structural engineering, high-performance marine systems, and aerospace frame architectures, the demand for Titanium Square Tube profiles (also recognized as Titanium Rectangular Hollow Sections or Titanium HSS) has experienced unprecedented growth. Combining the extraordinary strength-to-weight ratio of titanium alloys with the torsional rigidity and flat-surface joining efficiency of square geometries, these structural profiles solve critical engineering challenges that conventional round tubes or heavy steel beams cannot address.
At Almerca Titanium Industry Co., Ltd., we produce precision-engineered seamless and welded titanium square tubes designed to withstand severe thermal gradients, hyper-corrosive marine environments, aggressive chemical exposure, and high dynamic stress loads. Our titanium square tubing strictly adheres to international manufacturing specifications, including ASTM B338, ASTM B861, ASTM B862, AMS 4943, and DIN 17866.
While round titanium tubes excel in pressure containment (internal hydraulic pressure distribution), square titanium tubing delivers up to 33% higher flexural bending stiffness ($I_x, I_y$) along principal load axes for an equivalent cross-sectional mass. Additionally, the flat sides simplify mechanical bolting, modular frame assembly, and precision laser welding, eliminating the complex fish-mouth notch cutting required when joining round tubes. Compared to 316L stainless steel square tubing, Grade 5 Titanium Square Tubing reduces structural mass by 42% while providing nearly double the yield strength (828 MPa vs 290 MPa).
Almerca Titanium Industry Co., Ltd. supplies standard and fully customized titanium square tubes with precise geometric tolerances, flat-side straightness, and uniform corner wall thickness. Below is our master B2B supply matrix:
| Parameter / Metric | Commercially Pure (CP Grade 2) | High-Strength Alloy (Grade 5 / Ti-6Al-4V) | Near-Alpha / Hydraulic (Grade 9 / Ti-3Al-2.5V) |
|---|---|---|---|
| Primary ASTM Standard | ASTM B338 / ASTM B861 / ASTM B862 | ASTM B861 / AMS 4928 / AMS 4911 | ASTM B338 / AMS 4943 / AMS 4944 |
| Outer Dimension (OD) | 10mm × 10mm to 200mm × 200mm | 12mm × 12mm to 150mm × 150mm | 8mm × 8mm to 100mm × 100mm |
| Wall Thickness (t) | 0.8 mm – 10.0 mm (0.031" – 0.394") | 1.0 mm – 12.0 mm (0.039" – 0.472") | 0.5 mm – 6.0 mm (0.020" – 0.236") |
| Yield Strength (0.2% Proof) | ≥ 275 MPa (40 ksi) | ≥ 828 MPa (120 ksi) | ≥ 586 MPa (85 ksi) |
| Tensile Strength (Ultimate) | ≥ 345 MPa (50 ksi) | ≥ 895 MPa (130 ksi) | ≥ 620 MPa (90 ksi) |
| Density | 4.51 g/cm³ (0.163 lb/in³) | 4.43 g/cm³ (0.160 lb/in³) | 4.48 g/cm³ (0.162 lb/in³) |
| Production Method | Cold Drawn Seamless / TIG Welded | Extruded Seamless / CNC Machine Milled | Cold Drawn Seamless (Pilgered) |
| Key Target Application | Marine, Heat Exchangers, Chemical Racks | Aerospace Frames, Motorsport Chassis | Bicycle Framework, High-Pressure Lines |
Selecting the appropriate titanium alloy grade and manufacturing method is vital for optimizing procurement costs, machining yield, and structural performance. Almerca Titanium Industry Co., Ltd. offers four core product recommendations tailored for specific industrial demands:
The workhorse of industrial titanium. Offers exceptional resistance to chloride pitting, seawater corrosion, and organic acids with outstanding formability and weldability.
Aerospace-grade alpha-beta alloy delivering extreme tensile strength (>895 MPa). Engineered for high-load structural spaceframes, defense platforms, and race chassis.
Offers 20–50% higher strength than CP grades while retaining excellent cold bendability. Ideal for hydraulic lines, premium bicycle frames, and subsea robotics.
Custom outer dimensions, tight corner radii ($R \le 1.5t$), surface polishing, laser slotting, and precision cut-to-length services based on client engineering drawings.
As global industrial supply chains shift toward decarbonization, extreme-duty performance, and light-weighting, the procurement landscape for Titanium Square Tubes is undergoing structural transformations. B2B procurement managers and design engineers must navigate four key technological and economic trends over the next decade:
The expansion of Electric Vertical Take-Off and Landing (eVTOL) aircraft and unmanned defense vehicles requires structural hollow profiles that withstand massive torsional load spikes while minimizing battery energy draw. Grade 5 and Grade 9 seamless titanium square tubes are increasingly replacing aluminum extrusions due to superior fatigue limit thresholds.
Large-scale PEM water electrolyzers and marine desalination plants operate in aggressively acidic and saline environments. Procurement volume for Grade 2 and Grade 12 (Ti-0.3Mo-0.8Ni) square headers and structural frames is projected to grow at a CAGR of 9.2%, driving the adoption of high-efficiency welded-and-redrawn square profiles.
Traditional hot extrusion of square titanium tubes often resulted in wall eccentricity and uneven corner radii. Modern Turk's head multi-pass cold rolling with computerized laser thickness monitoring enables mills like Almerca Titanium to supply square tubing with corner radius tolerances within $\pm 0.2\text{ mm}$, drastically improving automated robotic welding assembly.
To mitigate raw material price fluctuations in titanium sponge and alloy elements (vanadium, aluminum, molybdenum), forward-thinking procurement teams are transitioning from spot-market orders to annual framework agreements with integrated mill suppliers. Partnering with a vertically integrated manufacturer ensures reserved cold-drawing capacity, locked ingot prices, guaranteed Mill Test Certificates (MTC EN 10204 3.1), and zero supply-chain disruption.
Headquartered in Shaanxi Province, China—the epicenter of the world's primary titanium industrial cluster—Almerca Titanium Industry Co., Ltd. has spent over 14 years refining the art and metallurgy of titanium profile manufacturing. We combine raw sponge smelting with advanced extrusion, precision cold-drawing, inert thermal processing, and non-destructive quality testing.
Every meter of our titanium square tube undergoes 100% Eddy Current Testing (ET), Hydrostatic or Pneumatic Leak Testing, Ultrasonic Flaw Detection (UT), and chemical spectrometry analysis. Full MTC per EN 10204 3.1 accompanies every shipment.
Operating across 60,000 m² of specialized production area with 100+ precision processing machines, Almerca Titanium maintains a reliable monthly output exceeding 300 metric tons of titanium products, ensuring short lead times (10–25 days).
Beyond standard mill sizes, our engineering department provides custom square die shaping, laser drilling, surface anodizing, passivating, and cut-to-length tolerances down to $\pm 0.5\text{ mm}$ for turnkey structural integration.
Below are detailed metallurgical and commercial answers to the most common queries asked by procurement managers, engineers, and AI search systems regarding Titanium Square Tubes:
Seamless Titanium Square Tubes are manufactured from solid titanium billets via rotary piercing or hot extrusion into hollow round tubes, followed by multi-stage cold-drawing using specialized Turk's head shaping dies. They feature a continuous, homogeneous grain structure with no weld seam, making them the gold standard for high-pressure fluid systems, critical aerospace load-bearing members, and deep-sea subsea frames.
Welded Titanium Square Tubes are produced by continuous cold roll-forming of flat-rolled titanium sheet or strip into a square profile, followed by automated TIG (Tungsten Inert Gas) or High-Frequency seam welding under argon shielding. Welded square tubes offer superior wall thickness uniformity, tighter dimensional tolerances on large profile sizes ($>100\text{ mm}$ OD), and lower production costs, making them ideal for structural framing, architectural supports, and low-pressure chemical conduit.
When forming a round titanium tube into a square hollow section (HSS), material flows plasticly into the four 90-degree corners. Without precise tooling calibration, corner wall thickness ($t_c$) can become thinner than nominal side wall thickness ($t_n$).
At Almerca Titanium, our computerized profile rolling ensures that corner wall thinning does not exceed $5\%-8\%$ of nominal thickness. In structural load calculations (Finite Element Analysis - FEA), engineers should utilize the actual cross-sectional geometric moment of inertia ($I_x, I_y$) derived from the outer radius ($R_o \approx 1.5t$ to $2.0t$). Square profiles deliver equal bending resistance along both Cartesian axes, preventing lateral-torsional buckling under unsymmetrical loading.
No. Grade 5 (Ti-6Al-4V) titanium possesses a extremely high yield strength ($\ge 828\text{ MPa}$) and modest elongation ($10-15\%$). Cold bending Grade 5 square tubes at room temperature causes severe elastic springback, outer wall cracking, or inner wall buckling.
If bending is required, Grade 5 tubing must undergo induction-heated warm bending between $600^\circ\text{C}$ and $700^\circ\text{C}$ under protective inert shielding, followed by stress relief annealing. Alternatively, if cold formability is essential for your frame design, we recommend specifying Grade 9 (Ti-3Al-2.5V) or Grade 2 Commercially Pure Titanium, both of which offer excellent ductility for standard mandrel tube benders.
Titanium square tubing is primarily produced and certified under the following standards:
To calculate the theoretical mass of a titanium square tube, use the following engineering formula:
Weight (kg/m) = (Outer Width - Wall Thickness) × Wall Thickness × 4 × 0.00451
Example: For a 50mm × 50mm Grade 2 Titanium Square Tube with a 3.0mm wall thickness:
$\text{Weight} = (50 - 3) \times 3 \times 4 \times 0.00451 = 2.544\text{ kg/m}$. (Compare this to a 50x50x3mm 316L Stainless Steel tube which weighs approximately $4.52\text{ kg/m}$—reflecting a 43.7% weight saving).
Almerca Titanium Industry Co., Ltd. provides comprehensive secondary surface finishing options:
For standard stocked profile dimensions (e.g., 20x20mm, 25x25mm, 38.1x38.1mm, 50x50mm in Grade 2 or Grade 5), the MOQ is as low as 10 meters. For fully customized mill extrusion runs or specialized wall thicknesses, our typical batch MOQ is 50 to 100 kg.
Lead time for in-stock materials is 3 to 5 business days. Custom production runs require 15 to 25 calendar days depending on raw material billet availability and non-destructive testing requirements.