TC 4 titanium alloy plate rod| Aerospace Medical Selection Guide

Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-07-23

An actual case of an aviation parts enterprise in Shandong encountered a purchase pit, The supplier offers a quotation of 120 yuan/kg for TC4 bars, After arrival, the material was found to be only in the ordinary annealed state, Solution aging treatment not required by drawings, Material mechanics indexes fail to meet design requirements, hundreds of thousands of machining losses.TC4 is Ti‑6Al‑4V., It is a α+β dual-phase titanium alloy with a wide range of applications, Many purchases are confusing with heat treatment status.It's different from the TA2, 10 is different., The core advantage lies in high strength combined with lightweight, The tensile strength of annealed state is not lower than 895MPa, About twice as much as TA2 pure titanium, Density 4.43g/cm³, The specific strength is better than ordinary alloy steel.

TC4 belongs to aluminum-vanadium dual-phase titanium alloy, Aluminum stabilizes alpha phase to improve strength and heat resistance, Vanadium stabilizes β phase, giving consideration to strength and plasticity, iron, oxygen, carbon, nitrogen, Hydrogen is strictly controlled as an impurity element.National standard grade TC4, corresponding to American standard Grade5, UNS number R56400, aviation execution AMS4928;Medical ultra-low clearance version TC4 ELI corresponds to Grade23, to oxygen, carbon, nitrogen, Hydrogen impurity control is stricter, Specially designed for human implant components.Need to pay attention to the brand distinction, TA9 relies on palladium to resist reducing acid corrosion, TA10 relies on molybdenum and nickel elements to resist chloride ion corrosion, and TC4 high strength positioning is different, They are not interchangeable.

Mechanical properties: tensile strength ≥895MPa;After solution and aging heat treatment, Tensile strength can reach 1100MPa level, synchronous increase of yield strength, But the elongation will decrease slightly.TA2 industrial pure titanium tensile strength is only about 345MPa, the strength difference between the two is obvious.With the comprehensive characteristics of high strength and light weight, TC4 is widely used in aerospace load-bearing components, medical implant, marine military industry pressure-resistant component, High-end equipment Hydraulic valve bodyChemical field is mostly used for stirring shafts and high-strength fasteners that need to withstand loads.

The market will follow the fluctuation of titanium raw materials, Cold rolled sheet reference 140‑170 yuan per kg, Hot-rolled medium plate 125‑150 yuan/kg, Hot rolled forged bar Φ20‑100mm reference 120‑145 yuan per kg, The price of the big round will continue to rise, Compare TA2 Pure Titanium, TC4 is 1.3‑1.7 times more expensive overall.The processing fee of 10‑20 yuan/kg will be additionally increased for the order of zero cutting, Inquiry must be written clearly diameter thickness, as-heat-treated condition, Flaw detection requirements, ELI medical grade, Just look at the naked quotation is easy to appear late cost rises sharply.

The procurement and receiving process can be verified through four points., First check warranty and furnace lot number, check aluminum, Vanadium element and mechanical measured dataSecond, XRF spectrum detection, TC4 will appear obvious aluminum, vanadium characteristic peaks, used to distinguish TA2, TA11 and other brands;Third, portable durometer, TC4 hardness HV300‑340, significantly higher than TA2;Auxiliary can refer to nonmagnetic, Silver grey appearance, Density parameters as a complement, It is impossible to determine the authenticity of the stamp only by relying on the stamp.

TC4 processing difficulty is higher than ordinary pure titanium, Five difficult points to pay attention to, Low thermal conductivity, cutting heat concentrated on the tip, Coated carbide tools are required to be fully cooledHigh chemical activity is easy to cause stick welding;Rapid development of work hardening;Elastic modulus is low, thin-walled parts are easy to vibrate and let the tool;When welding temperature exceeds 400℃, it is easy to absorb hydrogen and oxygen and embrittle., Welding requires high purity argon protection on both sides, Supporting ERTi‑6Al‑4V welding wire, Stress relief annealing after welding.

Procurement has three high-frequency risks, One is to ignore the heat treatment state, Drawings require solution aging, The contract only says TC4, Supply default annealed state, Strength not up to standardSecond, industrial TC4 is directly used in medical scenes, The implant must be selected with TC4 ELI with stricter impurity controlThird, only inquire about the base price of bare materials, without specifying flaw detection, size and special requirements, and the subsequent additional cost is very high.

Suppliers based in Baoji China Titanium Valley can provide TC4 industrial grade and TC4 ELI medical grade materials, Third-party test reports available, Traceability of batch records, engineer's strength in combination with working condition, specification, Heat treatment requirements give recommendations for selection.titanium barBrand selection and machining technologytitanium stirrerSelection and Procurement GuideSelection of TA9 Titanium Palladium Alloy Plate Reducing Acid Working Conditions

frequently asked questions

Q: What about TC4 and TA2? A: There are high requirements for tensile strength of materials, and TC4 is selected for the pursuit of lightweight;For corrosion resistance only, TA2 pure titanium is selected without high load requirements.

Q: TC4 annealed state and solution aging state difference? A: Annealed tensile strength ≥895MPa, better plasticity;After solid solution and aging treatment, the strength increases by about 20% and the plasticity decreases. The heat treatment status must be clearly indicated on the drawings.

Q: What scenario requires TC4 ELI? Medical parts implanted in human body, TC4 ELI is an ultra-low clearance version, More stringent impurity control standards, Ensure biocompatibility.

Q: What are the main points of TC4 welding? ERTi‑6Al‑4V welding wire of the same brand shall be selected, High purity argon protection, Stress relief annealing is recommended after welding.

disclaimer

This article selection ideas, Price range is based on industry project experience, For technical reference only, Not as engineering design, Direct basis for purchasing contract.aviation, Medical critical parts selection, Please have qualified engineering and technical personnel combine the on-site working conditions, ASTM B348 and other international standards to carry out evaluation, Titanium price changes dynamically with raw material market, Actual quotation is subject to market conditions on the date of order.