Titanium flange introduction 6 steps: from 0 to buyer, 6 types of flange once clear
Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-08-03
initial contactTitanium flangeIt is easy to confuse various types such as plate type, butt welding, loose sleeve and thread.Master the following 6 steps, from reading the map to placing an order in an hour.Depends on 12 yearsTitanium non-standard equipmentProject experience, collation
Titanium Flangesix Steps to Beginner Procurement, Contains 6 types of flange introduction, 5 major implementation standards, 4 kinds of media grade matching, 5 procurement avoidance points, asTitanium flangeAt the beginning of the series, you can communicate with suppliers after reading it.
Core idea:Titanium flangeThe six steps are, Identify flange construction type, Confirmation of performance standards, Matching grade according to medium, Determine specification parameters, Verification of manufacturing processes, Evaluate procurement costs.Three minutes per step, one hour.Titanium flangeBasic selection knowledge.
Step 1: Identify structure, 6 categoriesTitanium flangedetailed explanation
Titanium flangeAccording to the connection form, it is divided into 6 categories, and most procurement scenarios only use the first three.
Plate flange PL, flat attached structure, the simplest structure, suitable for low and medium pressure conditions within 1.6MPa;
Butt welding flange WN, necked butt welding structure, high pressure bearing capacity, suitable for high pressure conditions up to 4.0MPa;
Loose sleeve flange LJ, titanium ring with carbon steel flange loose sleeve structure, suitable for large diameter pipeline, can reduce material cost;
Threaded flange Th, threaded connection, no welding, mostly used for small caliber, pressure does not exceed 1.0MPa;
Socket welding flange SW, pipe insert flange internal welding, for small diameter high pressure scenarios;
Flanged cover/blind BL, no through holes, used as a closure for pipe end closure.
Step 2: Confirm the implementation standard, distinguish between 5 types of standards, and select the wrong standard to install.
Titanium flangeThe implementation standards are divided into domestic, chemical engineering, American Standard, European standard, Five Systems of Japanese Standard, Mismatch of bolt holes will occur if the standard is selected incorrectly, Unable to assemble on site.
GB/T 9112 - 2010, pressure grade PN0.25-PN4.0MPa, common for domestic projects;
HG/T 20592-2009, pressure grade PN0.6-PN16.0MPa, preferred for chemical industry;
ASME B16.5-2020, Class150-2500, used for foreign-funded projects and export projects;
EN 1092-1:2018, PN0.6-PN16.0MPa, EU export project;
JIS B2220-2012, 5K-63K, selected for projects in Japan and Southeast Asia.
Step 3: Matching medium, titanium grade corresponding to Class 4 working conditions, wrong grade selection is high-frequency error
Titanium flangeThe core basis of brand selection is process medium, and most of the selection errors come from wrong brand selection.
Seawater, neutral brine containing chloride ions, TA2 is preferred to resist chloride ion pitting;
Wet chlorine, bromine-containing acetic acid such media, TA10, add molybdenum and nickel elements, crevice corrosion resistance;
Dilute sulfuric acid, dilute hydrochloric acid reduction acid medium, select TA9 containing palladium, improve reducing acid resistance;
Concentrated caustic soda medium with concentration of more than 30%, Titanium is not recommended, N6 pure nickel is recommended, Titanium material is easy to crack in concentrated alkali environment.
Step 4: Determine specifications, 3 core parameters
Titanium flangeThe core of the specification consists of three items: DN nominal diameter, PN pressure rating, and executive standard number.
DN nominal diameter represents pipe diameter, covering DN15-DN1200, common range DN50-DN300;
PN0.25-PN4.0MPa, PN1.0-PN2.5 is most commonly used for projects;
The standard number is determined according to the project territory and divided into GB, HG, ASME, EN and JIS.
Step 5: Verify manufacturing process, 3 key indicators
Hardness of sealing surface, generally ≥180HV;Annealed TA2 minimum ≥150HV;
Roughness of sealing surface: Ra≤0.8μm under normal working conditions, Ra≤0.2μm under high pressure working conditions;
Annealing treatment, 550-600 DEG C heat preservation for 1 - 2 hours, eliminate welding residual stress.
Step 6: Evaluate Purchase Price, 3 Purchase Points
Quotation not equal to total project cost, logistics, packaging, material detection, Changing or Refunding, Hidden costs such as delays, 20%-50% of total input
Factory direct supply is 15%-20% lower than traders, and the price difference of products of the same specification can be up to twice;
Compared with TA2, TA10 and TA9 are more expensive, 2~3 times more expensive than TA2.
5 Real Selection Cases
TA2 plate flange is selected for seawater desalination project, medium seawater is 25-40℃, DN500 PN1.6 PL, stable use for 8 years without pitting corrosion;
PTA unit selects TA10 butt welding flange, medium contains bromoacetic acid at 120℃, DN200 PN2.5 WN, and there is no gap corrosion after 5 years of service;
Chlor-alkali plant TA10 butt welding flange, wet chlorine 80℃, DN100 PN1.6 WN, 6 years of operation without corrosion;
TA9 titanium flange containing palladium is selected for dilute sulfuric acid working condition in chemical plant, Medium 70℃ dilute sulfuric acid, 4 years without pitting
Caustic soda project selection error case, 50% NaOH 80℃ working condition TA2 titanium flange, Stress corrosion cracking occurs at 3 to 6 months, Pure nickel forgings shall be selected for this condition.
5 Key Points to Avoid Purchasing Pit
1. inferior brand, will be TA10, TA9 posing as TA2 supply, verification method, Molybdenum check MTC material certificate, nickel, Palladium content
2. The hardness of sealing surface is insufficient, and the annealed hardness is lower than 150HV, which can be retested by field hardness tester;
3. Standard mix, use GB flange to pretend ASME flange, bolt hole position does not match, check MTC certificate mark execution standard;
4. Composite layer thickness shrinkage, 1.5mm multi-layer as 3mm supply, Ultrasonic thickness measurement
5. trade middleman mark-up, The middleman can increase the price by 30%-50%, Quality control is difficult, Preference is given to the source manufacturer.
Relying on Baoji China Titanium Valley Industrial Cluster, Titanium flange supporting technical services can be provided, One-to-one selection consultation included, provide a medium, temperature, pressure, pipeline specifications, Fast output selection schemeStanding TA2, TA10 plate, butt welding flange spot;Can assist in reviewing MTC material certificate and verifying the authenticity of materials.
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disclaimer, Text Structure Classification, standard clause, Process parameters are only used as reference for technical selection., The actual selection needs to be combined with the medium concentration, temperature, Comprehensive evaluation of field operation and maintenance conditions, The final proposal shall be subject to the written confirmation documents of both parties.