1、 Classification system

1. Classified by structural form

Integral titanium flange: The flange is integrally formed with the equipment/pipeline, suitable for high-pressure and high-temperature scenarios.

Welded titanium flange: Connecting pipes by welding, matching the pipe wall thickness, used for high-pressure systems.

Flexible titanium flange: composed of flange rings and flanges, easy to disassemble, suitable for pipelines that require frequent maintenance.

Threaded titanium flange: commonly used for low-pressure, small-diameter pipelines through threaded connections.

Socket welding titanium flange: fixed by socket welding, suitable for small diameter medium and high voltage systems.

Flat welding titanium flange: divided into plate flat welding and neck flat welding, suitable for medium and low voltage scenarios.

2. Classified by connecting components

Container titanium flange: Used for pressure vessel interfaces, it must meet sealing and pressure requirements.

Titanium pipe flange: used for connecting pipeline systems, it needs to be adapted to the size and pressure rating of the pipeline.

3. Classification of sealing surface forms

Protruding surface: the most common, suitable for medium and low pressure.

Concave convex surface: enhances sealing performance, used in high-pressure or vibration environments.

Mortise and tenon surface: high-precision sealing, used for special working conditions.

Ring connection surface: suitable for ultra-high pressure systems.

2、 Standard system

1. International standards

ASME standards: including B16.5 and B16.47, covering pressure ratings and dimensions.

DIN standards: such as DIN 2633/2634, German industrial flange standards.

EN standard: EN 1092-1 is the European universal flange standard.

2. Domestic standards

GB/T series:

GB/T 9112-2010： Standardize the types and parameters of steel pipe flanges, with some provisions applicable to titanium flanges.

GB/T 16598-2013： Performance standards for titanium and titanium alloy flange materials.

3. Industry standards:

HG/T 20592-2009： Chemical industry flange standards, including titanium flange marking methods.

JB/T 82-2015： Technical specifications for flanges in the mechanical industry.

4. Grade requirements for forgings

Grade I: Carbon steel/austenitic stainless steel forgings with nominal pressure PN 0.25~1.0MPa.

Grade II and above: General forgings with PN 1.6~6.3MPa.

Grade III: PN ≥ 10.0MPa flanges, PN>4.0MPa chromium molybdenum steel forgings, and low-temperature ferritic steel forgings.

5. Material standards

Pure Titanium Series: TA1、TA2， Suitable for conventional corrosive environments.

Titanium alloy series: TA9、TA10、TC4， Used in high temperature, high pressure, or highly corrosive environments.