How to choose titanium?3 Steps to Avoid 90% of Pits

Deep cultivation of titanium industry for 12 years, We've seen a lot of procurement personnel choose materials easily and directly determine the plan based on experience, Simply think that as long as the working conditions require titanium, Use TA2 titanium directly.improper selection, Either budget overruns cause unnecessary cost waste, Either the material doesn't match the working condition, Early corrosion failure of equipment.This article is based on Baoji China Titanium Valley's many years of special materials project service experience, Share a 3-step selection decision method for titanium, help industry, environmental protection, Seawater treatment industry procurement and technical personnel to clarify the logic of material selection, Avoid titanium material selection risk.

Step 1: Determine the media type Titanium material in oxidation, Good corrosion resistance in neutral medium, reductive media scene, Pd-Ti alloy grades are preferred.The first step is to distinguish between media categories. the oxidizing medium comprise dilute nitric acid, concentrated nitric acid, chromic acid, pypocholoride, Titanium is the preferred material for this kind of working condition, Use TA2 regularlysaline, seawater, wet chlorine gas, Neutral salt solution belongs to neutral medium, Titanium material adaptability is strong, You can choose TA2 or TA10.Dilute hydrochloric acid, dilute sulfuric acid of low concentration and phosphoric acid belong to reducing media, so TA10 is recommended.Concentrated hydrochloric acid and hydrofluoric acid belong to strong reducing media, titanium materials are not suitable, and other special alloys need to be replaced. When selecting the type, you can first confirm whether the medium is oxidizing or reducing, When the composition of the medium is complex and cannot be determined, TA10 is preferred as a conservative option.

Step 2: Determine temperature and concentration Medium temperature and material concentration directly determine the final choice of titanium grades. When the temperature is within 100℃, TA2 shall be selected under normal working conditions;Temperature range 100-150℃, recommended TA10, passivation film stability is better;Temperature 150-200℃, TC4 titanium alloy can be selected, the material strength is higher;Temperature exceeds 200℃, need to choose TA15 and other high temperature titanium alloy. Concentration level, dilute sulfuric acid concentration ≤5%, TA2 can meet the use;TA10 has better corrosion resistance when dilute sulfuric acid concentration is 5%-10%.Dilute sulfuric acid concentration ≥10%, choose TA10 and need to thicken the plate design to improve the service life of the equipment.

Step 3: Determine life expectancy and overall cost This step mainly evaluates the full cycle investment and judges whether the material selection scheme is economical and reasonable. TA2 shall be selected for short-cycle equipment with expected service life of less than 3 years to control initial procurement cost;3-8 year cycle equipment, TA10 or TA2, balancing performance and procurement budget;Long-cycle equipment with design life of 8 years or more, Recommended TA10 or TC4, Lower late equipment replacement, Loss due to production stoppage.For production critical equipment, Once the fault stops, the loss is large, It is recommended to select a higher grade material upward, Avoid the risk of sudden failure. from a cost point of view, TA10 purchase price 30%-50% higher than TA2, But equipment life can be increased by 50%, Amortization of the annual cost of use is more advantageous.

Complete three-step selection process sorting, Step 1 Identify the media type, oxidizing, Neutral medium priority TA2, TA10 was selected as reducing medium, Strongly reducing medium Consider replacing other alloysStep 2 Check temperature and concentration parameters, TA2 is selected within 100℃, 100 to 150℃ TA10, TC4 is considered for temperatures above 150℃The third step is to evaluate the design life of the equipment, select TA2 for short-term equipment, and select higher grade grades for medium-and long-term equipment as required.

The following four real project cases demonstrate the practical application of this three-step decision-making method. Case one: dilute sulfuric acid cooler in phosphate fertilizer plant.The medium of the first step is dilute sulfuric acid, which belongs to reducing medium;The second step is concentration 8% and temperature 90℃.The third step belongs to the medium service life equipment, and the final material selection TA10. Case 2: dye factory acetic acid reactor.The first step acetic acid belongs to neutral medium;The temperature of the second step is 80℃;The third step equipment needs long-term operation, choose TA 2. Case 3: Seawater desalination heat exchanger.The seawater in the first step belongs to neutral medium containing chlorine;the second step is operated at 30 DEG C;The third step equipment requirements long service, select TA 10. Case 4: Aeronautical structural parts.The first step is neutral atmosphere;The second step requires high material strength;Step 3 Long-term use, choose TC4.

Titanium PlateSpecifications Quick lookup table: 10 common thicknesses/a>

How to choose titanium to control procurement costs? According to the three-step selection method to match the corresponding brand, do not blindly choose high-priced alloys, nor choose materials lower than the requirements of working conditions.Short-term equipment priority TA2, long-term key equipment selection TA10, is the real cost savings.

The medium composition is complex, and it is impossible to determine the type. How to select the material? There are two safe schemes, one is to choose TA10, which contains palladium titanium alloy medium with a wider range of adaptation;The second is to send samples and entrust suppliers to carry out corrosion tests, both of which can reduce the risk of selection.

What are the effects of choosing the wrong titanium grade? Mild cases will shorten the service life of the equipment, such as TA2 used in reducing media, the service life directly halved;Serious corrosion will occur perforation, material leakage, resulting in production safety hazards.

Does titanium material procurement have to choose the national standard brand? It is suggested that the national standard brand should be selected, and the chemical composition and mechanical properties of the national standard titanium material should have strict standards and controllable quality.Non-tag numbers fluctuate greatly in performance and are not recommended for use on industrial equipment.

Can titanium manufacturers provide selection support? Regular source manufacturers can provide service mode selection.provide a medium, temperature, concentration, Design life and other working condition information, The manufacturer will recommend the appropriate brand, Material specifications and processing technology.It is suggested to consult 2 - 3 suppliers for cross-matching scheme.