TC4 titanium alloy selection solution| Ti-6Al-4V High strength pressure preferred| Class 6 application + Class 5 medium + Domestic import price

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

Located in Baoji China Titanium Valley, Shaanxi Qianyi Tuoda deep-ploughed titanium alloy non-standard processing for many years, Titanium alloy sheet in TC4, forge piece, Rod customization Field accumulation Aviation, deep-sea equipment, Medical equipment project landing experience.Turbine blade blank project of an aviation supporting enterprise, Drawing specifies TC4 (Ti-6Al-4V) titanium alloy, TA2 industrial pure titanium supplier, The two materials look similar., Significant difference in mechanical properties, TA2 Tensile strength ≥370MPa, TC4 annealed tensile strength ≥895MPa, The intensity difference is 2.4 times.TC4 blanks can withstand higher rotational speed loads at the same specifications, while TA2 materials are at risk of fracture.The composition of TC4 titanium alloy is systematically reviewed in this paper., material property, Six application industries, Five types of media adaptation, Market price range and pit avoidance points for processing procurement, Equipment Engineer, Material procurement personnel collection consult.

core conclusionsTC4 belongs to α+β dual phase titanium alloy, 2-3 times stronger than TA2, Material density is only 4.43g/cm³, About 60% of steel, Specific strength is better than ordinary alloy steel, and aviation., Marine Engineering, Titanium alloy grades commonly used for medical implant components.

The basic composition of TC4 titanium alloy corresponds to the grade.TC4 is Ti-6Al-4V, The matrix is titanium., Aluminum accounts for 5.5%-6.8%, as an alpha phase stabilizer, Improve material strength and heat resistanceVanadium accounts for 3.5%-4.5%, belongs to beta phase stabilizer, optimizes plasticity and processing performance.Iron, oxygen, carbon, nitrogen, hydrogen as impurity elements, all set corresponding content upper limit.GB/T 3620.1-2016;American standard UNS number UNS R56400, ASTM Grade5, plate, bar, pipe corresponding to B265, B348, B861 respectively;European standard Ti Grade5, grade 3.7165;AMS 4928 bar, AMS 4911 sheet, AMS 4943 pipe commonly used in aviation field;ASTM F136 is used for medical implants. TC4, TA2, TA10, TA9 performance comparison, TA2 industrial pure titanium tensile ≥370MPa, focusing on chemical corrosion resistance;TA10 titanium molybdenum nickel alloy tensile strength ≥485MPa, the advantage lies in crevice corrosion resistance;TA9 titanium palladium alloy tensile strength ≥370MPa, suitable for strong reducing acid conditions;TC4 dual-phase titanium alloy annealed tensile strength ≥895MPa, yield ≥825MPa, density 4.43g/cm³, mainly high strength pressure and light weight.After solution aging heat treatment, the tensile strength of TC4 can reach 1100MPa.

TC4 has four core performance advantages.The first is high intensity., The tensile index of annealed TC4 is 2.4 times of TA2, After solution aging treatment, the strength can reach 3 times of TA2, Yield strength is also significantly higher than pure titanium, Material elongation ≥10%.The second is lightweight., Density 4.43g/cm³, 56% of steel 7.85g/cm³, Under the same strength condition, TC4 component weight can be reduced by 30%-40% compared to steel, Suitable for scenes with outstanding weight loss needs.The third is heat resistance, annealing long-term use temperature does not exceed 315 ° C, short-term conditions can reach 400 ° C.The fourth is corrosion resistance, corrosion resistance performance in chloride ion medium, seawater, dilute oxidizing acid environment is close to TA2;face strong reducing acid, Weaker corrosion resistance than TA9 and TA10, boiling hydrochloric acid, TC4 is not recommended for high concentration dilute sulfuric acid environment.

Six typical application industries and components.Aviation industry, used for turbine blades, compressor disks, casing, relying on high strength, lightweight, moderate temperature stability characteristics;the invention relate to that field of ocean engineering, in particular to a deep-sea pressure-resistant shell, a propulsion component and a valve component, which give consideration to seawater corrosion resistance and lightweight pressure-bearing;Medical industry, artificial joints, dental implants, orthopedic bone plates, relying on good biocompatibility;High-pressure equipment field, high-pressure cylinders, deep-sea exploration equipment shell, adapt to high-pressure conditions;Sports equipment, golf clubs, bicycle frames, tennis rackets, both light and high strength;In the high-end automobile field, racing connecting rods, valves and springs meet the needs of lightweight.According to the data of Titanium Zirconium Branch of China Nonferrous Metals Industry Association, In 2024, the domestic market scale of TC4 titanium alloy products is about CNY 3.5 billion, Annual growth rate of 22%, The aviation and medical sectors together account for 60 -70% of total demand.

Three real-world projects.Case 1, turbofan engine supporting TC4 integral forged compressor disk, specification diameter 500mm, thickness 80mm, withstand 350℃ high temperature gas and 15000 rpm high speed.The original TA2 forging cannot bear the load, and there is a hidden danger of fracture;TC4 is used with β forging + solution aging process, heat treatment system is 480℃ for 4 hours and 560℃ for 6 hours, and it has been put into use for 5 years.The market unit price of aviation grade TC4 forgings is 800-1200 yuan per kilogram.Case 2, 6000 meters deep sea detector TC 4 coil welding pressure shell, specification diameter 300 mm, length 800 mm, withstand 60 MPa seawater pressure.TA2 plate scheme is selected, the wall thickness of the component needs to be 50mm, and the weight is 270kg;Wall thickness 30mm after replacement of TC4 plate, Weight reduced to 165kg, Weight loss 40%, Adopt full penetration argon arc welding with vacuum annealing at 550-600℃, The cost of the whole shell is 250,000 - 350,000 yuan.Case 3: Medical orthopedics TC4 artificial joint rod blank, specification diameter 40mm, length 120mm, long-term contact with human body fluids.316L stainless steel implants are prone to nickel ion allergy, which also affects MRI detection;ASTM F136 medical grade TC4, surface anodized, service cycle up to 20 years, medical TC4 bar unit price 200-280 yuan per kilogram.

Five types of medium selection reference.In seawater and neutral salt water environment containing chloride ions, TC4 has good corrosion resistance performance, and TA2 can also be selected for routine projects;Dilute oxidizing nitric acid medium, TC4 suitability is good;10% dilute sulfuric acid such as weak reducing acid environment, TC4 moderate corrosion resistance, priority to TA10, TA9;boiling hydrochloric acid, Strong reducing acids such as dilute sulfuric acid with high concentration, TC4 corrosion resistance is poor, TA9 or Hastelloy C276 recommendedHigh temperature concentrated alkali with concentration higher than 50%, TC4 has the risk of hydrogen embrittlement, N6 is selected for this working condition., N4 pure nickel material.Key points of selection, TC4 core positioning is not chemical corrosion protection materials, Chemical corrosion priority TA2, N6 NickelWhen the project has high intensity pressure, Lightweight requirements, aviation, deep-sea equipment, medical implant, High pressure vessel scenario takes precedence TC4.

Key points of TC4 titanium alloy manufacturing process, Compared to TA2 pure titanium, TC4β forging temperature control requirements are strict, β phase transition temperature is about 995℃Solution aging heat treatment temperature range needs to be precisely controlled, High sensitivity to work hardening, Intermediate annealing can be arranged in the processing process.Overall process flow: raw materials into the factory verification furnace batch number, re-test aluminum and vanadium elements and mechanical properties;sawing or wire cutting blanking, reserving machining allowance of 5 to 10mm;beta forging, hot extrusion or hot rolling is carried out, and the beta forging temperature is controlled at about 1050 DEG C;700-790 DEG C for 1 - 2 hours annealing air cooling to eliminate internal stress;CNC lathe, milling, grinding cold machining, single pass deformation control, avoid work hardening;high strength component are added with a solution age process, wherein that solution aging process is carried out at 480-560 DEG C aft 880 DEG C;Finish pickling passivation, sandblasting or anodizing surface treatment;Ultrasonic flaw detection, mechanical and chemical composition testing;Vacuum packed with nitrogen and delivered in protective wooden cases.

Domestic and imported TC4 price reference in the second quarter of 2026.Cold-rolled sheet thickness 1-3mm, domestic quotation 140-170 yuan per kilogram, import 320-420 yuan per kilogram;Hot rolled medium plate 6-40mm, domestic 125-150 yuan per kilogram, imported 280-360 yuan per kilogram;20-100mm diameter hot rolled forged bar, Domestic 120-145 yuan per kilogram, Import 260-340 yuan/kgDiameter 150-300mm large forging round domestic 145-165 yuan per kilogram, imports 320-400 yuan per kilogram;AMS4928 aviation grade forgings domestic 800-1200 yuan per kilogram, imported 1500-2200 yuan per kilogram;ASTM F136 Medical rod domestic 200-280 yuan per kilogram, imported 400-600 yuan per kilogram.Purchasing reference: TC4 price is 1.4-1.6 times higher than TA2, lower than TA9 material;The price of aviation grade TC4 is much higher than that of civilian grade, and the medical grade is 30%-50% higher than civilian grade.Domestic Titanium, Western superconductor, Western materials, Baoji Kehui and other manufacturers can stably supply TC4 products, Aeronautical Class I Pressure Parts, Some scenarios of high-end medical materials can be considered imported.

TC4 implementation of relevant standards: GB/T 3620.1-2016 specified titanium alloy brand composition;GB/T 13810-2017 is the titanium alloy sheet standard;GB/T 2965-2007 and GB/T3624 correspond to bars and tubes respectively;ASTM B265, B348, and B861 correspond to American standard plates, bars, and pipes;AMS Series Specification Aviation Grade TC4, ASTM F136 Titanium Alloy for Surgical Implantation;Refer to ASME BPVC Section VIII for strength calculation of pressure vessel.

TC4 four-step authentication.The first step XRF spectrum detection, authentic TC4 can detect obvious aluminum, vanadium characteristic peaks, aluminum content 5.5%-6.8%, vanadium 3.5%-4.5%;TA2 impersonation will not detect aluminum vanadium.The second step is the third party mechanical tensile test. The tensile strength of annealed TC4 is ≥895MPa, and TA2 is only 370-450MPa.The third step hardness test, annealing TC4 hardness 320-360HV, solution aging 360-400HV, TA2 annealing hardness only 150-180HV.The fourth step metallographic observation, TC4 presents α+β dual phase structure, TA2 is a single phase α structure.TC4 designation is required in purchase contract, Specify the range of aluminum and vanadium elements, mechanical indexes, Attached third-party test report, Both GB and ASTM reference standards are marked.

Titanium material selection comparison: TA2 is selected for chemical equipment aiming at corrosion resistance;TA10 is selected for crevice corrosion and wet chlorine conditions;TA9 was selected as strong reducing acid;TC4 is selected for high strength and light weight pressure bearing component;N6/N4 nickel material is selected for high temperature concentrated alkali working condition;Medical implant Medical priority TC4.

TC4 processing five precautions.β forging temperature beyond the range, will cause coarse grain, mechanical properties decline;The deviation of solution aging temperature will directly affect the final strength.TC4 welding hot crack susceptibility is higher than TA2, Interlayer temperature control ≤150℃, High purity argon shield on the backMachining hardening is obvious, cutting speed is controlled at 30-50m/min, and fully cooled;In high temperature environment containing hydrogen, the risk of hydrogen absorption embrittlement of TC4 is higher than that of TA2, and boiling hydrochloric acid and concentrated alkali conditions are not applicable.

Procurement five types of risk prevention.First, TA2 is supplied as TC4, and fails in a short time under high strength conditions;Second, replace AMS aviation grade materials with civil grade TC4, and the certification does not meet the project requirements;Third, recycled remelted material impersonates brand-new raw materials, aluminum and vanadium content is insufficient, mechanical properties are not up to standard;Fourthly, the strength of high strength components can not meet the design requirements only by annealing treatment, omitting solution aging;Fifth, incoming materials do not do third-party mechanics and composition testing, unqualified materials into production.Procurement needs to clarify the brand, element index, heat treatment process, testing standards, supporting third-party testing data.

home FAQ

Q1: How to select TC4 and TA2? TA2 is preferred for chemical corrosion protection scenario, TC4 is selected for high strength pressure and light weight working condition, and the two cannot be exchanged at will. Q2: Is TC4 resistant to hydrochloric acid medium? Dilute hydrochloric acid with a normal temperature concentration of less than 5% can be used for a short time, boiling, High concentration hydrochloric acid corrosion rate is higher, Strong reducing acid is preferred for TA9 titanium palladium alloy. Q3: Is TC4 suitable for making heat exchange tubes? Heat exchange tubes focus on corrosion resistance and heat conduction, generally choose TA2, TA10;TC4 can be selected for high strength pressure tube plate of heat exchanger. Q4: TC4 Long-term use temperature upper limit? Annealed state long-term use does not exceed 315℃, short-term maximum of 400℃, temperature continues to rise strength rapid decay. Q5: How to choose between domestic TC4 and import? Domestic TC4 for civil projects has stable performance and higher cost performance;Aviation Class I pressure-bearing, high-end medical implants can be evaluated for imported materials.

Industry development trend: aviation, medical, deep-sea equipment to drive TC4 demand continues to grow;Aviation high-end TC4 forgings continue to promote domestic substitution;The demand for 3D printing precision TC4 components in the medical and aviation fields has steadily increased.

written in the end

TC4 is not a high-priced version of industrial pure titanium TA2, but a suitable material for high-strength, pressure-bearing and lightweight conditions.40%-60% increase in procurement costs compared to TA2, However, the tensile strength of the material can be increased from 370MPa to 895MPa, It's also aviation., deep sea, The core reasons why the medical industry chooses TC4.Misuse of TA2 under high-intensity pressure conditions, It will bring safety hazards of component fracture, Seemingly saving material costs, It will actually cause greater project losses. TC4, TA10, TA9, TA2 constitute titanium alloy selection system: TC4 main high strength pressure lightweight;TA10 is suitable for crevice corrosion conditions of weak reducing acid and wet chlorine;TA9 should deal with strong reducing acid medium;TA2 as a general industrial pure titanium, suitable for seawater, chloride ion containing conventional corrosion conditions.

If you are in aviation equipment, medical apparatus and instruments, Material selection for deep-sea pressure vessel project, Technical docking and procurement quotation, This paper can be used as a design institute, Manufacturer technical communication reference.

Shaanxi Qianyi Tuoda Technology Co., Ltd. takes root in Baoji Titanium Valley of China, More than ten years focus on titanium alloy non-standard equipment, TC4 titanium alloy forging plate customization, Available for TC4 titanium alloy working condition selection, materials processing, Welding process kit, One-stop technical consulting services.

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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, temperature, 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.