Reliable Multiple Models of Forged Flanges for Resale

• Customization: Available
• Processing Object: Metal
• Molding Style: Forging
• Model NO.: GC-DZ25787
• Molding Technics: Gravity Casting
• Application: Machinery Parts
• Material: Steel
• Heat Treatment: Normalizing
• Surface Treatment: Passivation
• Forging Tolerance: +/-0.5mm
• Standard: GB
• Certification: ISO 9001:2000
• Flange Type: Blind Flange / Weld Neck Flange / Slip-on Flange /
• Pressure Level: Pn1.0, Pn1.6, Pn2.5, Pn4.0, Pn6.3, Pn10.0
• Nominal Size: DN15 ~ DN3000
• Materials and Properties: Carbon Steel / Stainless Steel / Alloy Steel / Two
• Process: Forging/Heat Treatment/Machining
• Mechanical Properties: RM/RP0.2/a/Hbw
• Transport Package: Standard Export Packaging
• Specification: 200x50x200
• Trademark: GOCHAIN
• Origin: China
• HS Code: 7307910000
• Production Capacity: 50000000000pieces/Year
• Package Size: 500.00cm * 120.00cm * 300.00cm
• Package Gross Weight: 3000.000kg
• Lead Time: 15 days (1 - 100 Pieces) ; To be negotiated ( > 100 Pieces)

Product Description

Product Description

Forged flanges are made of high-quality steel and have a dense internal structure, making them more than 30% stronger than ordinary flanges. They can withstand higher pressure and temperature shocks, and the sealing surface is less prone to leakage, making them particularly suitable for critical operating conditions.

Detailed Photos

From a manufacturing process perspective-the root of performance

The essence of forged flanges is to optimize the internal structure of metal through physical means, thereby obtaining workpieces with superior mechanical properties.

From an application perspective-matching needs:

High-temperature and high-pressure environments: The thick-walled design and dense crystalline structure of forged flanges (especially weld neck flanges) effectively disperse stress and resist high-temperature oxidation, making them the preferred choice for such applications.

Highly corrosive media: Forging is commonly used to process expensive materials such as duplex steel and super austenitic stainless steel. Forging ensures the uniformity of the microstructure of these high-alloy materials, maximizing their corrosion resistance potential.

From a life-cycle cost perspective-balancing procurement and use

Forged flanges represent a high-reliability investment. In critical situations where "safety first" is crucial, their life-cycle cost is far lower than the repair and downtime losses caused by the failure of cheaper flanges.

Forged flanges are more than just metal rings; they are industrial components integrating materials science, forming processes, standards and specifications, and value engineering.

From a process perspective, they optimize metal microstructure.

From an application perspective, they safeguard harsh operating conditions.

From a market perspective, they ensure traceable quality and compliance.

From a cost perspective, they represent long-term value investment.

 

Quality Grading:

There are quality differences in forged flanges on the market, mainly reflected in the forging ratio (degree of forging deformation), heat treatment process control, and the coverage of non-destructive testing (such as ultrasonic testing and magnetic particle testing).

 

Product Parameters

Forged Flange Core Product Parameters List

 

 

Parameter Category	Parameter Name	Typical Values / Range	Remarks / Selection Guide
1. Dimensions	Nominal Diameter (DN/NPS)	DN15 (1/2"), DN20 (3/4"), DN25 (1"), DN40 (1½"), DN50 (2"), DN80 (3"), DN100 (4"), DN150 (6"), DN200 (8"), DN250 (10"), DN300 (12"), up to DN600 (24") and above	Refers to the diameter of the connecting pipe. Imperial units are typically used for ASME flanges.
	Flange Outer Diameter (D)	Varies by pressure class. E.g., Class 150 DN100 is approx. 229mm; Class 300 DN100 is approx. 254mm	The diameter of the outermost edge of the flange.
	Bolt Circle Diameter (PCD)	Determined by standard and pressure class, e.g., 190.5mm, 215.9mm, etc.	The diameter of the circle that passes through the centers of the bolt holes.
	Bolt Hole Diameter (L)	e.g., Φ18mm, Φ22mm, Φ26mm, Φ30mm	Depends on the bolt size.
	Number of Bolt Holes (n)	4, 8, 12, 16, 20, 24	Increases with flange size and pressure class.
	Flange Thickness (T)	e.g., 14mm ~ 100mm+	Depends on pressure class and size. Higher pressure and larger size require greater thickness.
	Hub Height (H)	e.g., 50mm, 64mm, 76mm, etc.	Only applicable to Weld Neck (WN) flanges, affects welding strength.
	Facing Type	RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint), MFM (Male-Female Face), TG (Tongue & Groove)	RF is most common; RTJ is used for high-pressure applications.
2. Pressure Rating	Class (American Standard)	Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500	Higher number indicates higher pressure-bearing capacity.
	PN (European/Chinese Standard)	PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160	Corresponds to different pressure units (Bar/MPa).
3. Material Composition	Carbon Steel	ASTM A105 (American Std forging), 20# (Chinese Std), Q235 (low-end)	Most versatile, suitable for non-corrosive media like water, oil, and gas.
	Low-Temp Carbon Steel	ASTM A350 LF2 Class 1	Suitable for low-temperature environments down to -46°C, e.g., LNG tanks.
	Austenitic Stainless Steel	ASTM A182 F304/304L, F316/316L, F321	304/316 for corrosion resistance; 316L offers better resistance to intergranular corrosion.
	Alloy Steel	ASTM A182 F11 (1.25Cr-0.5Mo), F22 (2.25Cr-1Mo), F91 (9Cr-1Mo-V)	Suitable for high-temperature and high-pressure services, e.g., steam lines.
	Duplex Stainless Steel	ASTM A182 F51 (2205), F53 (2507)	High strength, resistance to chloride stress corrosion cracking, used in offshore platforms.
4. Execution Standards	International Std	ASME B16.5 (American Std, ≤24"), ASME B16.47 (Large diameter, ≥26")	Most common globally, especially in petrochemical and export projects.
	National Std	GB/T 9112-9124 (Chinese Std), NB/T 47010 (Chemical/Pressure Vessel)	Commonly used in domestic Chinese engineering projects.
	Other Standards	HG/T20592 (Chemical Industry), DIN (German Std), JIS (Japanese Std), EN 1092-1 (European Std)	Depends on project design requirements or location.
5. Process & Tolerance	Manufacturing Process	Forging (Free Forging / Die Forging) + Heat Treatment (Normalizing/Annealing/Q&T) + Machining	Forgings are denser than castings; heat treatment is essential to relieve internal stress.
	Surface Finish	Rust-proof oil, black paint, clear varnish, galvanization, passivation	Rust-proof oil is most common; stainless steel often requires pickling and passivation.
	Tolerance Grade	Precision / Regular	Tolerance ranges are usually specified in the applicable standard.
6. Certification & Marking	Marking Content	Trademark/Logo, Material Grade, Pressure Class, Nominal Size, Heat Number	E.g., XXX A105 CL300 DN100 H34321, ensures quality traceability.
	Test Reports	Mill Test Certificate (MTC) 3.1/3.2, NDT Reports (MT/PT/UT), Heat Treatment Curves	Large projects or exports often require EN 10204 3.1 or 3.2 certificates.

Certifications

Our company has passed the certifications for quality management system, environmental management system, and occupational health and safety management system.

Company Profile

                                                   OUR COMPANY

YANTAI GOCHAIN METAL CO.,LTD was found in 2017, specializing in the manufacture of metal products and accessories. As a comprehensive metal processing and manufacturing enterprise, GOCHAIN benefits from solid expertise and state-of-the-art production tools. Based in China's Shandong province, GOCHAIN has chosen a strategic location that provides essential proximity for the development of its activities. Located close to major highways, it is only 2 hours' drive from Qingdao. Our engineering department is staffed by experts in the design and manufacture of steel structures .Our know-how in mechanical welding and our compliance with industrial standards guarantee maximum quality control.

As a specialist fabricator, we draw on our expertise in the construction of metal components and equipment. Our team of specialists designs and manufactures metal products to your specific requirements, offering exceptional reliability and quality. Whether you need Custom steel structures, fittings or complete equipment, we're here to provide you with turnkey solutions.

GOCHAIN uses 2D/3D mechanical design software to ensure accurate calculations and the strength and durability of your project. With our team of qualified professionals and integrated design office ,we ensure the precise design of metal fittings and steel structures. As a specialist in metal structures in China, we focus on quality, precision and customer satisfaction, offering metal products that meet the highest standards.

GOCHAIN is looking forward to cooperating with customers around the world!

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