Complete Solution of Titanium Stirrer Selection| 4 types of propellers +6 types of media + selection formula + domestic import price

Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-07-25

Taking root in Baoji China Titanium Valley, Shaanxi Tuoda deeply cultivates hundreds of billionsTitanium non-standard equipmentFor more than ten years,titanium stirrerIn the field of titanium reactor supporting components, we have accumulated a large number of experience in chemical, pharmaceutical and hydrometallurgical projects.PTA oxidation reactor project, 4kW titanium turbine agitator as per drawing, Supplier selection 316L stainless steel product delivery, The equipment has been in operation for only 6 months, Corrosion fracture of stirring shaft, Causing material leakage, Production line shutdown.Under the chemical conditions of chloride ion, acetic acid and dilute reducing acid coexistence,titanium stirrerThe use of cycle, far better than 316 l stainless steel mixer.Detailed explanation of this articletitanium stirrerFour types of propellers, dielectric matching scheme, Selection calculation formula, Domestic Import Price Reference, Key Points for Avoiding Pit in Processing Procurement, Equipment Engineer, Material procurement personnel collection consult.

core conclusions：titanium stirrerThe purchase price is 1.8-2.5 times that of stainless steel mixer, Under corrosive chemical conditions, The service life of the equipment can reach 3-10 times that of stainless steel products.The core of agitator selection is to match the impeller type, medium and rotation speed, not the larger the impeller size, the better the effect.

titanium stirrerPerformance comparison with 316L stainless steel agitator:titanium stirrerExcellent corrosion resistance to chloride ion containing media, Corrosion Resistance by Surface Self-repairing Passivation Film, 316L stainless steel is prone to pitting corrosion in environments where chloride ion content exceeds 2000ppmface dilute reducing acid medium, Titanium medium corrosion resistance, Performance is not as good as TA9 titanium alloy, Stainless steel has weak corrosion resistance under such conditionsIn high temperature concentrated alkali environment, titanium materials are prone to hydrogen embrittlement, and 316L stainless steel has medium resistance.Titanium density 4.5g/cm³, only 56% of 316L stainless steel, lighter equipment weight, but higher raw material costs, higher processing threshold.Chemical mixing equipment applications,titanium stirrerThe proportion is 8%-12%, and the market application of stainless steel mixers accounts for more than 70%.

Titanium material grade selection, TA2 is the reference grade, suitable for marine, dilute acid, Universal chemical scenarios without crevice corrosionTA10 is suitable for crevice corrosion and wet chlorine conditions, and the price is 1.5-1.7 times that of TA2;TA9 for use in strong reducing acid environments, such as boiling hydrochloric acid, dilute sulfuric acid system, 5-8 times the price of TA2TC4 titanium alloy has higher strength, Adapt to high speed stirring conditions, The price is 1.4-1.6 times that of TA2.

Analysis of four kinds of titanium stirring paddle dry goods.Propelling propeller belongs to axial flow structure, Adapt to material viscosity less than 2000mPa·s scenario, Operating speed 80-250r/min, the ratio of that diameter of the paddle to the inside diameter of the kettle is 0.3-0.4, Mostly used for mixing low viscosity materials, heat transfer, Homogenization process.Turbo-type propeller is radial type, Suitable for materials with viscosity less than 50000mPa·s, Speed range 200-1500r/min, Diameter ratio of propeller kettle 0.3-0.6, Suitable for material dispersion, heat transfer, Solid-liquid suspension operation.Anchor propeller belongs to tangential type, Suitable for high viscosity materials with viscosity greater than 50000mPa·s, Speed 30-80r/min, Diameter ratio of propeller kettle 0.9-0.95, It acts as a scraper., Prevent scaling of materials.The frame paddle is also a wall-attached structure, Suitable for ultra-high viscosity materials with viscosity greater than 100000mPa·s, Speed 15-60r/min, Diameter of paddle kettle 0.9-0.98, Both wall scraping and heat transfer in the kettle are considered.

Six medium selection matching schemes: neutral brine system containing chloride ions, priority TA2 material, matching propulsion or turbine propeller, speed control 100-250r/min;Dilute oxidizing nitric acid medium, TA2 propeller, rotating speed 120-250r/min;Under dilute reducing acid condition containing chloride ion, TA10 or TA9 is recommended with turbine propeller, rotating speed 200-500r/min;high viscosity material containing solid particle, TA2/TA10, anchor type or frame type impeller, rotating speed 30-80r/min;strong reducing acid environment, TA9 turbine propeller, rotating speed 200-400r/min;Pharmaceutical food GMP scene, high purity TA2 propeller, speed 120-250r/min.

The three major selection calculation formulas are important references for engineering selection.Torsional shear strength is used to calculate the diameter of mixing shaft, Formula τ = 16T / (πd³), The allowable torsional shear stress of TA2 material shall not exceed 50MPa, T stands for stirring torque, d is that diameter of the stir shaft.Engineering example: 5kW propeller agitator, speed 150r/min, torque T = 9550 × P /n, calculated torque about 318N·m, calculated shaft diameter about 32mm, engineering selection standard Φ 40mm reserved safety margin.aspect ratio control, stirring shaft overall length and shaft diameter ratio control within 40-45;cantilever section from mechanical seal to propeller end, aspect ratio not exceeding 4-5;Radial runout of shaft seal position control within 0.08 0.10 mm, Ensure the service life of mechanical seals, Tip deflection does not exceed 1 per cent of total length, Reduce the risk of swing.Critical speed rigid shaft criterion, equipment working speed n≤0.7 times critical speed n_cr.For example, Φ50mm shaft, total length 2000mm propeller agitator, critical speed about 1800r/min, actual working speed is not higher than 1260r/min, conventional conditions are mostly controlled within 250r/min.Dynamic balance classification: G6.3 grade is selected when the conventional stirring speed is lower than 300r/min;G2.5 is selected for speeds higher than 300r/min;G1.0 is used for ultra-high speed scenarios with speeds exceeding 1000r/min.Processing requirements Propeller coaxiality ≤0.02mm, Stepped shaft reducing position fillet R≥5mm, Avoid stress concentration caused by sharp keyway corners.

Three real projects.Case 1: 600,000 tons/year PTA oxidation reactor TA9 titanium turbine agitator, specification Φ80mm, total length 3000mm, power 6kW, medium containing bromine ion acetic acid and para-xylene, operating temperature 120℃.The original 316L agitator was corroded and cracked for 1-2 years, and TA9 was replaced.titanium stirrerDouble face mechanical seal and flushing system, Stable operation for 6 years without abnormality, The whole set includes machine seal quotation 6-9 million yuan.Case 2: TA2 titanium frame agitator in hydrometallurgical plant, specification Φ 150 mm, total length 4500 mm, power 11 kW, material containing 30% solid nickel cobalt sulfate feed solution.316L material corrosion occurs after 1-2 years of use, Titanium frame agitator has been running stably for 8 years since it was put into use, matched assembly double-end mechanical seal, The whole set price is 8- 120,000 yuan.Case 3: TA2 propeller agitator in GMP workshop, Φ 50mm, total length 2000mm, power 0.75kW, medium diluted hydrochloric acid and organic solvent.316L polished surface is difficult to meet GMP roughness requirements, high-purity TA2 mirror polishing, roughness Ra≤0.4μm, matching single-end machine seal, the whole set price of 1.5-2.5 million yuan.

Market price reference in the second quarter of 2026: Φ50×L2000, 0.75-2.2kW propulsion typetitanium stirrer, domestic 6000-12000 yuan per set, the price of imported products is about twice that of domestic;Φ80×L3000, 4-7.5kW turbine agitator, domestic 14000-26000 yuan per set;Φ120×L4500 double-layer combination 11-18.5kW, domestic 30000-50000 yuan per set;Φ150 above supporting assembly double-end structure, domestic 50000-100000 yuan per set.TA9 High Puritytitanium stirrerThe price is 4-6 times that of ordinary TA2 products, and the premium of imported high purity models is higher.Price structure excluding motor reducer, Titanium body accounts for 35%-45%, Mechanical seals account for 25%-35%, Machining and dynamic balancing account for 15%-20%.Domestic titanium mixing body can stably replace imported, matching reducer motor more imported brands.

titanium stirrerStandard reference for implementation: HG/T 20569-2014 Mechanical mixing equipment, as the basis for mixer design;GB/T 13810-2017 Titanium and titanium alloy plates, used as raw materials for blades;GB/T 2965-2007 Titanium and titanium alloy bars for stirring shafts;GB/T 14039-2008 Mechanical seal, JB/T 4723-2014 Agitating transmission device;Refer to API 610, API 682 and ASME Pressure Vessel Code for demanding petrochemical service conditions.

Five key points for avoiding pits in processing, Titanium material has obvious work hardening, Cutting speed control 30-50m/min, Select carbide tools and match sufficient coolantG6.3 dynamic balance must be done for titanium propeller with rotating speed above 200r/min, Unbalance causes vibration, cause mechanical seal failureAfter welding of blade and stirring shaft, Vacuum annealing at 550-600℃ is required to relieve welding stress, Prevent weld cracking in corrosive environmentsFor materials containing solid particles, double-end machine seal plus flushing system must be selected;Strictly control the radial runout of shaft seal position to prevent premature damage of machine seal.

Procurement of five major risks need to focus on prevention: suppliers to 316L stainless steel as titanium supply;TA2 shall be used to replace TA9 required in drawings under strong reducing acid condition;No dynamic balance test has been carried out before delivery;Common single-end mechanical seal shall be used under corrosion condition;PT penetration testing omitted for propeller shaft welds.in the procurement contract, Be sure to indicate the titanium grade, impeller type, Power speed size, dynamic balance grade, seal form, Identify test items.

FAQ

Q1：titanium stirrerWhat are the reasons for the high procurement costs? Titanium raw material itself is more expensive than stainless steel, processing is difficult, but also supporting dynamic balance, argon shielded welding and other processes.Although the initial investment is higher, the service life of the equipment is longer and the comprehensive life cycle cost is better. Q2：titanium stirrerCan I replace the stainless steel mixer directly? The installation interface size can be matched, but the rotation speed, dynamic balance and mechanical sealing scheme need to be rechecked and cannot be replaced directly. Q3：titanium stirrerIs it suitable for all chemical media? Not applicable to all operating conditions, Hydrogen absorption embrittlement of titanium in high temperature concentrated alkali environment, N4/N6 nickel equipment is recommended for this kind of scenario.

titanium stirrerFive-step selection: the first step of combing the working conditions of medium, temperature and pressure, viscosity, solid content;secondly, selecting a titanium alloy grade according to the corrosion environment;thirdly, matching the paddle shape according to the viscosity of the material;step four, determine power and work speed;The fifth step is to select the mechanical sealing scheme and agree on the acceptance criteria of nondestructive testing and dynamic balance.

the development trend of industry, Demand for large titanium stirring components continues to rise, stir, mechanical seal, Flushing integrated products gradually popularized, Intelligent mixing equipment equipped with on-line speed and torque monitoring has become a new direction.

written in the end

titanium stirrerIt is not a simple high-priced stainless steel stirring equipment, but the preferred equipment under chloride ion and dilute reducing acid corrosion conditions.The purchase price is higher than stainless steel, but it can greatly extend the service life of equipment and reduce the cost of shutdown maintenance.Select the core remember: low viscosity materials choose propulsion, medium viscosity turbine, high viscosity materials choose anchor or frame propeller;TA2 for general corrosion, TA10 for crevice corrosion, TA9 for strong reducing acid;Single-end mechanical seal under normal working conditions, double-end mechanical seal under strong corrosion and particle working conditions, dynamic balance level as required.

If you are working for Chemical, medicine, hydrometallurgy, Dyeing project for reactor agitator selection, Technical docking and procurement quotation, This selection information can be used as and design institute, Technical reference for manufacturer communication.

Shaanxi Qianyi Tuoda Technology Co., Ltd. is located in Baoji, China Titanium Valley, more than ten years of deep cultivation titanium non-standard equipment customization, can providetitanium stirrerOne-stop service for working condition selection, titanium component processing, welding process matching and on-site technical consultation.

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disclaimerMaterial parameters in this paper, price range, The project case is only used as a reference for technical selection, Does not constitute a technical commitment and commercial offer.The actual use effect of materials is affected by medium concentration, temperature fluctuation, processing and welding technology, and field operation and maintenance conditions.Shaanxi Qianyi Tuoda Technology Co., Ltd. reserves the right of final interpretation of this article.Technical consultation: 15909236031 / 0917-3557966.