DETRA supplies forged and plate flanges according to major ASTM, ASME and EN standards for oil & gas, petrochemical, chemical, power generation, pressure equipment and industrial piping applications.

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Our supply range covers carbon steel, low-temperature carbon steel, alloy steel, stainless steel, duplex, super duplex and special alloy flanges in a wide range of sizes, pressure classes, material grades and facing configurations.

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FLANGE TYPES

DETRA supplies flanges in various configurations according to piping system and project requirements.

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Available Types:
Weld Neck (WN) · Slip-On (SO) · Blind (BL) · Socket Weld (SW) · Threaded (THD) · Lap Joint (LJ) · Long Weld Neck (LWN) · Orifice Flanges · Spectacle Blinds · Paddle Blinds & Spacers

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Flanges can be supplied according to ASME, EN and project-specific dimensional requirements.

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ASTM A105 — Carbon Steel Flanges

Grades: A105 · A105N

ASTM A105 covers forged carbon steel piping components for ambient and higher-temperature pressure systems.

A105 and normalized A105N flanges are among the most widely used carbon steel flanges for oil & gas, petrochemical, refinery, power generation and general industrial piping applications.

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They can be supplied in Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint and other applicable flange configurations.

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ASTM A350 — Low Temperature Carbon & Alloy Steel Flanges

Grades: LF1 · LF2 · LF3

ASTM A350 covers carbon and low-alloy steel forgings requiring notch toughness testing for low-temperature service.

A350 LF2 is one of the most widely used low-temperature flange grades and is commonly specified for oil & gas, petrochemical, LNG and industrial piping systems operating at low temperatures.

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ASTM A694 — High Strength Carbon & Alloy Steel Flanges

Grades: F42 · F46 · F48 · F50 · F52 · F56 · F60 · F65 · F70

ASTM A694 covers carbon and alloy steel forgings for high-pressure transmission service.

A694 flanges are commonly used in oil & gas pipelines, high-pressure piping systems and transmission applications where higher mechanical strength is required.

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Grades such as F52, F60, F65 and F70 are frequently specified for high-pressure pipeline and energy projects.

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ASTM A182 — Alloy Steel Flanges

Grades: F1 · F5 · F9 · F11 · F12 · F22 · F91

ASTM A182 alloy steel flanges are intended for high-temperature and high-pressure piping applications.

Grades such as F11 and F22 are widely used in refineries, petrochemical facilities, boilers, steam systems and power generation applications.

F91 is commonly specified for demanding high-temperature and high-pressure applications requiring increased strength and creep resistance.

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ASTM A182 — Stainless Steel Flanges

Grades: F304 · F304L · F304H · F316 · F316L · F316H · F317L · F321 · F321H · F347 · F347H · F904L

ASTM A182 stainless steel flanges are widely used in corrosive and high-temperature piping applications.

F304/304L and F316/316L are among the most commonly specified stainless steel flange grades for chemical, petrochemical, food, pharmaceutical and general process piping systems.

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Stabilized grades such as F321/F321H and F347/F347H are used in elevated-temperature applications, while F904L / UNS N08904 provides increased corrosion resistance for aggressive chemical and acidic environments.

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ASTM A182 — Duplex & Super Duplex Flanges

Grades: F51 · F53 · F55

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F51 — UNS S31803 / S32205 — Duplex 2205
F51 duplex stainless steel flanges provide high mechanical strength together with excellent resistance to stress corrosion cracking, pitting and general corrosion.

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F53 — UNS S32750 — Super Duplex 2507
F53 super duplex flanges provide excellent resistance to chloride-containing environments, pitting, crevice corrosion and stress corrosion cracking.

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F55 — UNS S32760 — Super Duplex
F55 super duplex flanges provide high mechanical strength and excellent corrosion resistance for highly aggressive service conditions.

Duplex and super duplex flanges are widely used in offshore, subsea, seawater, desalination, chemical processing and demanding oil & gas applications.

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EN 1092-1 — EUROPEAN STANDARD FLANGES

DETRA supplies steel flanges according to EN 1092-1 in a wide range of pressure ratings, dimensions and material grades.

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Typical Carbon & Pressure Vessel Steel Grades:
P245GH · P250GH · P265GH · P280GH · P355GH and other applicable EN grades

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Typical Alloy Steel Grades:
16Mo3 · 13CrMo4-5 · 10CrMo9-10 · X10CrMoVNb9-1

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Typical Stainless Steel Grades:
1.4301 · 1.4307 · 1.4401 · 1.4404 · 1.4435 · 1.4539 · 1.4541 · 1.4550 · 1.4571

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Typical Duplex & Super Duplex Grades:
1.4462 · 1.4410 · 1.4501

EN flanges can be supplied according to applicable European material standards and project-specific technical requirements.

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PRESSURE CLASSES & RATINGS

Flanges can be supplied in ASME Class and EN PN pressure ratings according to the applicable dimensional standard, material grade and project requirements.

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ASME Pressure Classes:
Class 150 · Class 300 · Class 600 · Class 900 · Class 1500 · Class 2500

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EN Pressure Ratings:
PN6 · PN10 · PN16 · PN25 · PN40 · PN63 · PN100 · PN160 · PN250 · PN320 · PN400

Pressure-temperature ratings depend on the applicable flange standard, material group and operating temperature.

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DIMENSIONAL STANDARDS

DETRA supplies flanges according to major international dimensional standards and project specifications.

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ASME B16.5
Pipe flanges and flanged fittings generally covering NPS 1/2 through NPS 24.

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ASME B16.47 Series A & Series B
Large diameter steel flanges generally covering NPS 26 through NPS 60.

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EN 1092-1
Circular steel flanges commonly used in European pressure and piping systems.

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ASME B16.36
Orifice flanges used in conjunction with differential pressure measurement systems.

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ASME B16.48
Line blanks including spectacle blinds, paddle blinds and spacers.

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Other Standards:
DIN 2527 · DIN 2543 · DIN 2544 · GOST 33259 · JIS B2220 · Project-Specific Standards

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FLANGE FACINGS

Flanges can be supplied with different facing configurations according to the applicable standard and project requirements.

Available Facings:
Raised Face (RF) · Flat Face (FF) · Ring Type Joint (RTJ) · Tongue & Groove (T&G) · Male & Female (M&F) · Project-Specific Facing

Facing finish and surface roughness can be supplied according to applicable ASME, EN and project specifications.

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AVAILABLE SIZES

Flanges can be supplied in a wide range of nominal pipe sizes depending on flange type, pressure class, material grade and dimensional standard.

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ASME Flanges:
NPS 1/2" to NPS 60" and project-specific larger dimensions

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EN Flanges:
DN15 to DN1500 and project-specific larger dimensions

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Larger diameter and special flanges can be supplied according to project drawings and technical specifications.

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NACE Compliance: Materials can be supplied in accordance with NACE MR0175 / ISO 15156 requirements for sour service applications.

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SPECIAL & CUSTOM FLANGES

In addition to standard flanges, DETRA can supply special and custom flanges manufactured according to project drawings and technical specifications.

Custom requirements may include non-standard dimensions, special bore sizes, increased thicknesses, special facings, drilling patterns and project-specific material grades.

Special flanges can be supplied in carbon steel, alloy steel, stainless steel, duplex, super duplex and other project-specific materials.

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MATERIAL CERTIFICATION & TESTING

Flanges can be supplied with EN 10204 3.1 or 3.2 inspection certificates and project-specific testing and inspection requirements.

Depending on the material grade, applicable standard and project specification, inspection and testing may include dimensional inspection, visual inspection, ultrasonic testing (UT), magnetic particle testing (MT), liquid penetrant testing (PT), positive material identification (PMI), impact testing, hardness testing, corrosion testing and additional NDT or third-party inspection requirements.

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APPLICATIONS

Flanges supplied by DETRA are used across a wide range of industrial applications, including:

Oil & Gas · Petrochemical · Chemical · Refineries · Power Generation · Thermal Power Plants · LNG · Marine & Offshore · Seawater Systems · Desalination · Mining · Pressure Equipment · Steam Systems · Process Piping · Pipelines · Industrial Plants

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REQUEST A QUOTATION

Looking for a specific flange type, pressure class, material grade or project requirement?

Send us your material list, datasheet, piping class, drawing or project specification. DETRA can support requirements ranging from individual flanges to complete piping material packages.