Titanium Agitator — Corrosion-Resistant Mixing Shafts & Impellers Built to Drawing

Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-11-04

Titanium agitators · drawing to delivery

A titanium agitator keeps moving inside the liquids that destroy a steel or 316 mixer in months — acid baths, wet chlorine, brine and plating solutions. SXQYTD builds shafts, impellers, hubs and couplings to your drawing, with the rotating assembly dynamically balanced and the welds colour-checked. Below is the procurement detail that decides the grade, impeller type and balance grade before you issue a PO.

Material	Gr2 / Gr7 / Gr12 / Gr5 (B265 / B348)	Principle	Mechanical mixing — impeller drives flow
Capacity	0.5–200 m³ tank, 20–400 rpm, 0.37–75 kW	Industry	Plating, chlor-alkali, acid, seawater, pharma
Design code	Per drawing; ref. ISO 1940-1, ASME B73.1	Lead time	2–6 weeks (stock bar/plate shortens it)

1. What a titanium agitator is — by principle and by structure

By principle, an agitator is a rotating machine that converts motor torque into fluid motion — blending, suspending solids, dispersing gas or driving a reaction inside a titanium vessel. Unlike a static tank, its value is in motion and in the shaft that survives it. By structure, the working parts are the shaft (the rotating member), the impeller (the blade that moves the fluid) and the hub that fixes the blade to the shaft, with optional steady bearing, mechanical seal and gearbox. Common impeller types: paddle (low-shear, high-viscosity), turbine (radial flow, gas dispersion), anchor / frame (wall-scraping, very viscous) and propeller (axial, low-viscosity bulk flow).

2. Why titanium — material vs. medium vs. corrosion

Titanium forms a self-healing TiO₂ film that resists chlorides and oxidizing acids, so the mixer survives where 316L pits. The selection logic:

Medium	Recommended grade	Why
Dilute HCl, H₂SO₄ (no oxidizer)	Gr7 / Gr12	Pd/Mo keeps film alive in reducing acid.
Wet chlorine, hypochlorite, bleach	Gr2	Strongly oxidizing; Gr2 film stable.
Organic / acetic acid, plating bath	Gr2 / Gr1	Gr1 for highest purity service.
Seawater, brine	Gr2	Avoid stagnant crevices above ~70°C.
High-load rotating shaft	Gr5 (Ti-6Al-4V)	~2× the strength of Gr2 for the shaft.

Two things that sink a titanium agitator if ignored: (1) titanium's low elastic modulus (~110 GPa, roughly half of steel) makes long shafts deflect and whip at speed — the shaft must be sized for its critical speed and dynamically balanced, not just "made thicker"; and (2) titanium must never be coupled directly to steel — use an insulated coupling and isolation bushing, otherwise galvanic corrosion attacks the titanium in electrolyte. We design the balancing and isolation into the drawing, not as an afterthought.

3. Technical standards we build to

• Material: ASTM B265 / SB-265 plate (impeller), B348 rod (shaft), B863 wire if weld-built; MTC EN 10204 3.1 with PMI.
• Machining: per drawing; shaft straightness, runout and surface finish specified, not "as turned".
• Balancing: ISO 1940-1 balance grade G6.3 as standard, G2.5 for high-speed assemblies.
• Welding: ASME IX qualified GTAW with argon backing; weld colour acceptance silver to light straw, blue/grey rejected.
• Inspection: PT on seams, dimensional report, PMI, and a dynamic-balance certificate per rotor.

4. Manufacturing flow — from drawing to delivery

1) Drawing & duty review (medium, viscosity, rpm) → 2) Material release with MTC & PMI → 3) Shaft turning and straightening → 4) Impeller blanking, forming and machining → 5) Hub and blade welding (GTAW, argon backing) → 6) Pickling / passivation → 7) Finish machining, runout check → 8) Dynamic balancing to grade → 9) Assembly: coupling, seal, steady bearing → 10) Test spin / export packing. We hold Gr2 plate and Gr5 bar in Baoji, so step 2 often starts within days of PO.

5. Key component performance

Item	Control value	Note
Shaft straightness	≤ 0.1 mm/m, total ≤ 0.5 mm	Low modulus needs tight control.
Dynamic balance	ISO 1940-1 G6.3 (G2.5 on request)	Certificate supplied per rotor.
Weld colour	Silver – light straw	Contaminated weld is cut out and re-done.
Impeller runout	≤ 1 mm at blade tip	Prevents eccentric vibration.
Surface finish	Pickled & passivated, Ra ≤ 1.6 µm	Ra ≤ 0.8 µm on request.

6. Application industries

Industry	Medium	Why titanium
Electroplating / surface	Acid bath, electroless Ni	316L pits; Gr2 resists the bath.
Chlor-alkali	Bleach, wet Cl₂	Oxidizing duty, Gr2 standard.
Acid mixing / pickling	HCl, H₂SO₄	Gr7/Gr12 for reducing acid.
Seawater / desalination	Salt, brine	No crevice failure if designed right.
Pharma / food	Organic acids, sterile	Metal-ion-free product.

7. Selection guide

By medium: oxidizing → Gr2; reducing acid → Gr7/Gr12; high-strength rotating shaft → Gr5; high-purity → Gr1. By impeller: low-viscosity bulk flow → propeller; gas dispersion / radial flow → turbine; high-viscosity or wall-scraping → anchor/frame; gentle blending → paddle. Send medium, viscosity, tank size, rpm and whether gas or solids are involved — that decides the impeller and shaft grade together.

8. Customizable items & accessories

• Shaft length, diameter, single or multi-stage; impeller type, diameter, blade count.
• Anchor / frame / turbine / propeller built to the process duty.
• Steady bearing, mechanical seal, gearbox, insulated coupling.
• Surface finish and passivation level; spare blades and hub kits.
• Optional third-party inspection (SGS / TUV), extended traceability, spare-shaft option.

9. Lead time, test reports & warranty

Item	Commitment
Lead time	2–6 weeks typical; stock bar/plate starts within days of PO.
Test reports	MTC 3.1, PT report, dynamic-balance cert, dimensional, PMI.
Warranty	12 months against material and workmanship defects from shipment.

10. FAQ

Can you make the shaft from Gr5 for high speed?

Yes. Gr5 (Ti-6Al-4V) gives about twice the strength of Gr2, so we recommend it for the rotating shaft above ~300 rpm or for long overhung lengths where a Gr2 shaft would deflect. The impeller can stay Gr2 to keep cost down.

How do you stop galvanic corrosion at the coupling?

We fit an insulated coupling and an isolation bushing so the titanium shaft never touches steel in the electrolyte. Without that isolation, a steel motor or support will galvanically attack the titanium even in a mild acid bath.

Do you balance the rotating assembly?

Every rotor is dynamically balanced to ISO 1940-1 G6.3 as standard (G2.5 on request) and shipped with a balance certificate. On long shafts we also check the first critical speed so it never runs through resonance in service.