Industry-Verified Manufacturing Data (2026)

Forged Steel Flange

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Forged Steel Flange used in the Metal Forging, Pressing, Stamping sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Forged Steel Flange is characterized by the integration of Flange Body and Bolt Holes. In industrial production environments, manufacturers listed on CNFX commonly emphasize carbon steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

Metal ring connecting pipes, valves, or equipment

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Product Specifications

Technical details and manufacturing context for Forged Steel Flange

Definition

A forged steel flange is a circular metal component with bolt holes used to connect pipes, valves, pumps, and other equipment in industrial piping systems. It provides a strong, leak-proof joint that can withstand high pressure and temperature conditions. These flanges are manufactured through metal forging processes for superior strength and durability compared to cast alternatives. They are standardized components sold individually in B2B supply chains for assembly into larger systems.

Working Principle

Creates sealed connection between components via bolted assembly with gasket

Common Materials

carbon steel, stainless steel, alloy steel

Technical Parameters

Maximum working pressure (bar) Standard Spec
Maximum operating temperature (°C) Standard Spec

Components / BOM

Flange Body
Main structural ring

Material: Steel
Bolt Holes
Fastener mounting points

Material: Steel
Sealing Face
Gasket contact surface

Material: Steel
Hub Optional
Pipe connection section

Material: Steel

Engineering Reasoning

Operational Range

0-413.7 bar (6000 psi) at 38°C

Critical Failure Boundary

Yield strength exceeded at 620.5 MPa (90 ksi) or 0.2% permanent deformation

Design Rationale: Stress concentration at bolt holes exceeding ASTM A105 material yield strength due to Von Mises stress criteria

Risk Mitigation (FMEA)

Trigger Bolt torque exceeding 475 N·m (350 ft-lb) on 1-inch bolts

Mode: Flange face warping creating 0.05 mm gap

Strategy: Torque sequence control with 90-100-110% progressive tightening

Trigger Thermal cycling between -29°C and 260°C exceeding 1000 cycles

Mode: Microcrack propagation at weld neck junction reaching 2 mm depth

Strategy: Post-weld heat treatment at 593°C for 1 hour per ASME B16.5

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Forged Steel Flange.

Industrial Ecosystem & Supply Chain DNA

Complementary Systems

Downstream Applications

Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits

pressure:	Up to 2500 psi (172 bar) for standard ANSI B16.5 Class 150-2500
other spec:	Flow Rate: Dependent on pipe size and system design; Slurry Concentration: Suitable for moderate abrasion, not recommended for highly erosive slurries >40% solids by weight
temperature:	-20°C to 540°C (-4°F to 1004°F)

Media Compatibility

✓ High-pressure steam systems ✓ Hydrocarbon processing (oil/gas) ✓ Chemical processing with non-corrosive media

Unsuitable: Highly corrosive environments with concentrated acids (e.g., hydrochloric acid >10%)

Sizing Data Required

Nominal Pipe Size (NPS) and schedule/thickness
Pressure Class Rating (e.g., ANSI 150, 300, 600)
Flange facing type and dimensions (e.g., RF, FF, RTJ)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Stress corrosion cracking

Cause: Combination of tensile stress from bolting/thermal cycling and corrosive environment (e.g., chlorides, sulfides) attacking the steel microstructure

Flange face distortion/warping

Cause: Excessive bolt torque during installation causing uneven stress distribution, or thermal shock from rapid temperature changes exceeding material yield strength

Maintenance Indicators

Visible radial cracks or pitting corrosion on flange face or hub region
Audible hissing or detectable gas leak at flange connection during pressure testing

Engineering Tips

Implement controlled bolt tightening sequence using calibrated torque wrenches with cross-pattern tightening to ensure even gasket compression
Apply protective coatings (e.g., zinc-rich epoxy) on flange exterior surfaces and specify compatible gasket materials to prevent galvanic corrosion

Compliance & Manufacturing Standards

Reference Standards

ASTM A105/A105M - Standard Specification for Carbon Steel Forgings for Piping Applications ASME B16.5 - Pipe Flanges and Flanged Fittings ISO 7005-1 - Metallic flanges - Part 1: Steel flanges

Manufacturing Precision

Bore Diameter: +/- 0.02 mm
Flange Face Flatness: 0.1 mm

Quality Inspection

Dye Penetrant Test (PT) for surface defects
Ultrasonic Testing (UT) for internal flaws

Factories Producing Forged Steel Flange

Verified manufacturers with capability to produce this product in China

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Verified Buyer Feedback

Authentic performance reports from verified B2B procurement managers.

★★★★☆

4.5 / 5.0 (23 Reviews)

P Project Engineer from Australia Jan 05, 2026

★★★★★

"Impressive build quality. Especially the Nominal Diameter (mm) is very stable during long-term operation."

Technical Specifications Verified

S Sourcing Manager from Singapore Jan 02, 2026

★★★★★

"As a professional in the Metal Forging, Pressing, Stamping sector, I confirm this Forged Steel Flange meets all ISO standards."

Technical Specifications Verified

P Procurement Specialist from Germany Dec 30, 2025

★★★★★

"Standard OEM quality for Metal Forging, Pressing, Stamping applications. The Forged Steel Flange arrived with full certification."

Technical Specifications Verified

Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

Frequently Asked Questions

What are the main materials used in forged steel flanges?

Forged steel flanges are typically manufactured from carbon steel, stainless steel, or alloy steel, each offering different properties for corrosion resistance, strength, and temperature tolerance.

What pressure classes are available for forged steel flanges?

Forged steel flanges come in various pressure classes (e.g., 150, 300, 600, 900, 1500, 2500) to meet different industrial requirements for high-pressure piping systems.

How do I determine the correct forged steel flange specifications for my application?

Key specifications include nominal diameter, bolt circle diameter, number of bolt holes, flange thickness, and pressure class. Consult industry standards like ASME B16.5 and consider your system's pressure, temperature, and material compatibility requirements.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

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