Stainless Steel Pipe Fittings

Threaded Flanges By

Written by
Threaded Flanges By

Threaded Flanges are confined to special applications. Their chief merit lies in the fact that they can be assembled without welding this explains their use in extremely high pressure services, particularly at or near atmospheric temperature, when alloy steel is essential for strength and where the necessary post weld heat treatment is impractical. Threaded Flanges are unsuited for conditions involving temperature or bending stresses of any magnitude, particularly under cyclic conditions, where leakage through the threads may occur in relatively few cycles of heating or stress; sea welding is sometimes employed to overcome this, but cannot be considered as entirely satisfaction.

Materials used:

Stainless Steel, Alloy Steel, Carbon Steel, Cast Iron, Steel, Aluminum, Brass, Bronze, Monel, PVC, Thermoplastic etc.
Key Features:

Can be attached to the pipe without welding (sometimes an additional seal weld is used as well)
Ideal for higher pressure and temperature applications for small pipe sizes
Not recommended for larger loads, especially when subjected to higher torque 

Uses of threaded flanges:

•   Threaded flanges can be fitted to pipes of various sizes without welding and this is one chief benefit for which these flanges are highly demanded.
•   They can be used in extremely high pressure applications, particularly at or near atmospheric temperature, where the necessary post weld heat treatment is not possible.
•   They are ideal for small diameter piping applications.
•   They are economical and time saving devices.
•   These threaded flanges are normally designed for non-cyclic applications.
•   The flanges are suitable to be used in applications where welding is hazardous.
•   They can be used in highly explosive areas.

Materials :
Nickel Alloy Threaded Flanges

• ASTM / ASME SB 564 / 160 / 472 
• UNS 10276 (HASTELLOY C 276 Threaded Flanges)
• UNS 2200 (NICKEL 200 Threaded Flanges)
• UNS 2201 (NICKEL 201 Threaded Flanges)
• UNS 4400 (MONEL 400 Threaded Flanges)
• UNS 8020 (ALLOY 20 Threaded Flanges)
• UNS 8825 INCONEL 825 Threaded Flanges)
• UNS 6600 (INCONEL 600 Threaded Flanges)
• UNS 6601 (INCONEL 601 Threaded Flanges)
• UNS 6625 (INCONEL 625 Threaded Flanges)

Copper Alloy Threaded Flanges 
ASTM / ASME SB 61 / 62 / 151 / 152.
C 70600 (CU -NI- 90/10) – Cupro Nickel Threaded Flanges 
C 71500 (CU -NI- 70/30) – Copper Nickel Threaded Flanges
UNS NO. C 92200, UNS NO. C 83600, UNS NO. UNS NO C 10100,
C 10200, C 10300, C 10800, C 12000, C 12200

Duplex Stainless Steel Threaded Flanges 
ASTM / ASME A/SA 182 UNS F 44, F 45, F51, F 53, F 55, F 60, F 61.

Alloy Steel Threaded Flanges – AS Threaded Flanges
ASTM SA 182 F1/F5/F9/F11/F22/F91

Carbon Steel Threaded Flanges – CS Threaded Flanges 
ASTMA 105 Gr. F42/46/52/56/60/65/70

Low Temperature Carbon Steel Threaded Flanges – LTCS Threaded Flanges
A350 LF2/A350 LF3

Value Added Services
• Hot Dip Galvanizing • Electro polish

Test Certificate
Mill Test Certificate as per EN 10204 / 3.1B

Duplex Stainless Steel : Duplex Stainless Steel Threaded Flanges – Duplex SS Threaded Flanges 
ASTM A 182 – Threaded Flanges
F 51 UNS S31803 Threaded Flanges
S32750 Threaded Flanges
S31500 Threaded Flanges
ASTM / ASME A/SA 182 UNS Threaded Flanges
F 44 Threaded Flanges
F 45 Threaded Flanges
F51 Threaded Flanges
F 53 Threaded Flanges
F 55 Threaded Flanges
F 60 Threaded Flanges
F 61 Threaded Flanges
Carbon Steel Threaded Flanges – CS Threaded Flanges 

ASTM A105 Threaded Flanges
ASTM A 694-F42 Threaded Flanges
F46 Threaded Flanges
F52 Threaded Flanges
F60 Threaded Flanges
F65 Threaded Flanges
F70 Threaded Flanges

Copper Nickel Threaded Flanges – Cu-Ni Threaded Flanges

Source: Zhejiang Yaang Pipe Industry Co., Limited (

Article Categories:

Leave a Comment

Your email address will not be published. Required fields are marked *