Name: Carbon steel flange
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Carbon steel flange

High Strength Pressure Resistance: Excellent mechanical strength and pressure-bearing capacity
Reliable Sealing: Multiple sealing face types ensure zero leakage
Easy Installation: Standardized dimensions for convenient installation and maintenance
Cost-Effective: High value, long service life
High-Temperature Resistance: Suitable for high-temperature, high-pressure conditions
Wide Applicability: Compatible with various media and operating conditions

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◉ PRODUCT SPECIFICATION

Flange Types & Structures

Type	Structural Features	Pressure Rating	Primary Applications
Weld Neck Flange	Neck butt welding	PN10-PN420	High-temperature, high-pressure systems
Slip-On Flange	Flat welding installation	PN6-PN40	General pressure systems
Blind Flange	Pipeline end closure	PN10-PN420	System isolation and blanking
Threaded Flange	Threaded connection	PN6-PN40	Low-pressure removable systems
Lap Joint Flange	Loose flange ring	PN6-PN25	Systems requiring adjustment
Socket Weld Flange	Socket-type welding	PN10-PN160	Small diameter high-pressure systems

Material Grades

Q235: Ordinary carbon structural steel
20#: High-quality carbon structural steel
A105: Carbon steel forgings
Q345: High-strength low-alloy steel
A350 LF2: Low-temperature carbon steel
A694 F52: High-strength pipeline steel

Pressure Ratings & Standards

Standard System	Pressure Classes	Size Range	Sealing Face Types
ASME/ANSI	Class150-2500	1/2"-60"	RF, FF, RTJ
DIN	PN6-PN100	DN10-DN3000	RF, FF
GB	PN0.25-PN25	DN10-DN3000	RF, FF, MF
JIS	5K-30K	10A-1500A	RF, FF
BS	PN6-PN100	DN15-DN2400	RF, FF

Technical Parameters

Dimensional Tolerance Standards

Outside Diameter Tolerance: ±1.0mm (DN≤300), ±1.5mm (DN＞300)
Bolt Hole Circle Tolerance: ±0.5mm
Sealing Face Flatness: ≤0.2mm
Thickness Tolerance: ±1.0mm (thickness≤50mm), ±1.5mm (thickness＞50mm)

Sealing Face Types

Raised Face: Standard sealing face for various conditions
Flat Face: Low-pressure systems with soft gaskets
Ring-Type Joint: High-pressure, high-temperature systems
Tongue and Groove: Hazardous media sealing
Male and Female: Systems requiring precise alignment

Manufacturing Processes

Production Method

Forging Process: Free forging, die forging
Casting Process: Sand casting, precision casting
Cutting Process: Plate cutting and machining
Rolling Process: Large flange manufacturing

Quality Control

Chemical Composition Analysis: Spectrometer testing
Mechanical Property Testing: Tensile, impact tests
Hardness Testing: Brinell, Rockwell hardness
Dimensional Inspection: CMM precision measurement
NDT Testing: Ultrasonic, magnetic particle inspection
Pressure Testing: Sealing performance verification

Performance Parameters

Mechanical Properties

Material	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Impact Energy (J)
Q235	375-500	≥235	≥26	≥27
20#	≥410	≥245	≥25	≥39
A105	≥485	≥250	≥22	≥41
Q345	490-675	≥345	≥21	≥34

Pressure-Temperature Ratings

Operating Temperature: -29°C to 425°C
Maximum Working Pressure: 42MPa (Class2500)
Temperature-Pressure Derating: Complete temperature-pressure curves provided
Low-Temperature Application: Minimum -46°C (A350 LF2)

◉ Surfcae selection

SURFACE	CHARACTERISTIC	SUMMARY OF MANUFACTURING METHOD	APPLICATION
NO.1	Silvery white	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.1	lackluster	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.2D	Silvery white	After cold rolling, heat treatment and pickling are carried out	General material, deep material
NO.2B	Gloss is stronger than No.2D	After No.2D treatment, the final light cold rolling is carried out through the polishing roller	The general material
BA	As bright as a sixpence	No standard, but usually a bright annealed surface with high reflectivity.	Building materials, kitchen utensils
NO.3	Rough lapping	Grind with 100~200# (unit) strop tape	Building materials, kitchen utensils
NO.4	Intermediate grinding	Polished surface obtained by grinding with 150~180# strop abrasive tape	Building materials, kitchen utensils
NO.240	Fine lapping	Grinding with 240# strop abrasive tape	kitchenware
NO.320	Very fine grinding	Grinding was carried out with 320# strop abrasive tape	kitchenware
NO.400	The luster is close to BA	Use 400# polishing wheel to grind	General timber, building timber, kitchen appliances
HL	Hairline grinding	Suitable particle material for hair stripe grinding (150~240#) with many grains	Building, construction material
NO.7	It's close to mirror grinding	Use a 600# rotary polishing wheel to grind	For art or decoration
NO.8	Mirror ultrafinish	The mirror is ground with a polishing wheel	Reflector, for decoration