Titanium Lap Joint Flanges

Unique for its strength, lightness of weight and corrosion resistance

• Lightweight and high strength
• Corrosion resistant to chlorides, sea water & chlorine
• Excellent mechanical properties 
• Titanium grades, chemistry & specifications
• Temperature vs strength data
• In-depth information on Grade 2 and Grade 5
• Lap joint flange features and benefits

Titanium lap joint flanges are best known for being strong, lightweight and corrosion resistant. One property that stands out when compared to other metal lap joint flanges is that titanium lap joint flanges have the highest strength-to-weight ratio with a density of 4.51 g /cm³. As an example, titanium grade 5 is 4 times stronger than 316 stainless steel at nearly half the weight. This makes titanium lap joint flanges ideal for applications that require both lightness of weight and excellent strength such as oil & gas (down-hole), military and sporting goods. 

Titanium lap joint flanges are also unique among metals in the chemical processing industry for handling chlorine (wet) and chlorine compounds in aqueous solutions. Titanium lap joint flanges are fully resistant to solutions of chlorides, hypochlorites, chlorates, perchlorates and chlorine dioxide. As a result titanium lap joint flanges are often using within the chlorine related industries such as pulp and paper and chlor-alkali / bleach.

Titanium lap joint flanges are also an excellent material to prevent seawater corrosion. Because titanium lap joint flanges can resists corrosion by seawater up to temperatures as high as 500°F (260°C) as well as survive at ocean depths over a mile below the surface, titanium lap joint flanges are used throughout the oil & gas, desalination and marine industries.

The most common grades of Titanium threaded rods are Grade 2 and Grade 5. Gain more insight on these by accessing our Grade 2 and Grade 5 overviews or by contacting our engineering experts.

Resources: Titanium Torque Specs, Flange Dimensions, Flange Bolting Chart

Flange Types Available: Blind Flanges, Lap Joint Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges

Titanium Grades, Chemistry & Specifications

Titanium Grade 2  (Commercially Pure)

Unalloyed titanium; Commercially pure titanium is the most common grade of titanium utilized throughout industry due to its ease of availability and good properties.

Titanium Grade 2 Specifications: UNS R50400,  ASTM B 348,  AMS 4921, ASTM F 67, ISO 5832-2, Werkstoff 3.7035

Titanium Grade 5 (Ti 6Al-4V)

Known as the “workhorse” of the titanium alloys, Ti 6Al-4V, or Grade 5 titanium, is 2x stronger than titanium grade 2. This alloy offers high strength and light weight, useful formability and high corrosion resistance. Ti 6AI-4V finds many uses in the aerospace, medical, marine and chemical processing industries.

Titanium Grade 5 Specifications:  ASTM - B265, B348, B381, B861, F467 and F468, AMS - 4911, 4928, 4935, 4965 and 4967, MIL-T - 9046 and - 9047, Werkstoff 3.7165

Titanium Grade 7 

Grade 7 is the most corrosion resistant of all titanium alloys and is typically used in chemical processes and production equipment components. Similar to Grade 2, but with the addition of 0.12 to 0.25% palladium, Grade 23 has enhanced corrosion resistance to reducing acids and localized attack in hot halides. 

Titanium Grade 7 Specifications: ASTM - B265, B337, B338, B348, B363, B381, B861 and B862, Werkstoff 3.7235

Titanium Grade 23 (TI 6AL-4V ELI)

Titanium grade 23 or TI 6AL-4V ELI is an Extra Low Intersticial grade. This grade is similar to Grade 5, but because of the low intersticials, its mechanical properties are enhanced. This ELI grade is often found in more demanding medical device applications as well as industrial applications.

Titanium Grade 23 Specifications: 

ASTM - B265, B348, B363, B381, B861, B862 andF136, AMS - 4907, 4930 and 4956

Other titanium grades are also available upon request.

Mechanical Properties

Titanium's Resistance to Chlorine

Corrosion Data

Titanium Grade 5 Temperature vs Strength

Titanium Lap Joint Flange Features & Benefits

Lap joint flanges are unique in that they are made of two pieces, the flange itself and the stub end.

Flange

• The backside, has a slight shoulder that is square cut at the center or pipe hole
• The front side has a flat face with a filleted (rounded) center hole to match the filleted back face of the stub end. Here the stub end will wrap tightly around the center hole of the flange.

Stub End

• Shaped like a short piece of pipe with a weld bevel on one. This portion of the stub end is also called the sleeve.
• Narrow shoulder on the flange facing end called is the hub. The back face of the hub has a rounded transition (or inside fillet) that joins the hub to the sleeve

Benefits

• Economy 
  Because a lap joint flange has a two piece configuration, it offers a way to cut cost when piping systems requires 
• For high cost alloys the only "wetted" part is the stub end. In this situation, it is only required for the stub-end to be made of the higher cost corrosion-resistant material, where the flange itself can be the produced from lower cost steel.
• Ease of Work
  By using lap joint flanges, work can be simplified in situations that require frequent and rapid disassemble and assembly during the operation of a plant. The ability to spin that backing flange compensates for misalignment of the bolt holes during assembly.