Mild Steel Flanges
Product Overview
Mild Steel Flanges are used for connecting piping sections, valves, and pumps in low-pressure piping systems. They provide structural alignment and sealing performance in accordance with applicable piping standards.
Technical Specifications
|
Category |
Parameter |
Typical Value / Options (Example: 2" Class 150) |
|
Size & Dimensions |
NPS / DN |
1/2"–24" (DN15–DN600), Example: 2" (DN50) |
|
Outside Diameter (OD) |
150 mm (6.00") |
|
|
Bolt Circle Diameter (PCD) |
120.7 mm (4.75") |
|
|
Bolt Holes |
19.0 mm × 4 holes |
|
|
Thickness (T) |
19.1 mm (0.75") |
|
|
Bore Diameter |
61.2 mm (2.41") |
|
|
Pressure Rating |
ASME Class |
Class 150 / 300 / 600 |
|
EN/DIN PN |
PN6 / PN10 / PN16 / PN25 / PN40 |
|
|
Type & Facing |
Flange Type |
Slip-On / Weld Neck / Blind / Plate |
|
Facing Type |
Raised Face (RF) |
|
|
RF Height |
2.0 mm |
|
|
Material Composition |
Carbon (C) |
≤0.35% |
|
Manganese (Mn) |
0.60–1.05% |
|
|
Silicon (Si) |
0.10–0.35% |
|
|
Phosphorus (P) / Sulfur (S) |
≤0.035% / ≤0.040% |
|
|
Mechanical Properties |
Tensile Strength |
≥485 MPa |
|
Yield Strength |
≥250 MPa |
|
|
Elongation |
≥22% |
|
|
Hardness |
≤187 HBW |
|
|
Standards |
Manufacturing Standards |
ASME B16.5 / EN 1092-1 / DIN 2576 / GB/T 9119 |
|
Surface Treatment |
Protection Options |
Anti-rust oil / Black paint / Yellow paint / Hot-dip galvanized (HDG) |
|
Zinc Coating Thickness |
45–85 μm (HDG) |
Quality Control & Certifications
Quality Control
Ultrasonic Testing: UT inspection is applied on forging billets to identify internal discontinuities and subsurface defects within specified acceptance limits.
0.02mm Machining Tolerance: CNC machining controls sealing face flatness within 0.02mm in accordance with sealing surface requirements.
1.5x Hydrostatic Test: Batch sampling is tested at 1.5 times rated pressure to verify pressure containment and leakage performance.
Salt Spray Validation: Galvanized coating is tested through 48-hour salt spray exposure to evaluate corrosion resistance performance.
Compliance & Certifications
|
Certificate |
Scope |
|
ISO 9001:2015 |
Quality management system for controlled manufacturing processes |
|
EN 10204 3.1 |
Material traceability including chemical composition, mechanical properties, and heat number linkage |
|
PED 2014/68/EU |
Pressure equipment compliance for EU applications |
|
CE Mark |
Conformity with EU safety and regulatory requirements |
Custom Forging & Engineering Support
Custom Manufacturing
Dimensions can be produced based on customer drawings using CNC machining.
CAD Compatibility
Supports SolidWorks, STEP, and standard CAD file formats for production processing.
RFQ Response
Technical evaluation and quotation are provided within 24 working hours upon request.
Prototype Runs
Trial production is available to validate geometry prior to mass production.
Applications
|
Industry |
Application |
Key Benefit |
|
Water Treatment |
Municipal pipelines and filtration systems |
Stable sealing performance under operating pressure |
|
Oil & Gas |
Low-pressure transfer lines and storage systems |
Maintains alignment under vibration conditions |
|
HVAC Systems |
Boiler and chilled water piping networks |
Supports load distribution across flange joints |
|
Chemical Processing |
Non-corrosive fluid transfer systems |
Stable performance under temperature variation |
|
Power Generation |
Auxiliary cooling and low-pressure steam lines |
Reduces leakage risk in service operation |
Traceability & Packaging Compliance
Heat Number Stamping
Each component is permanently marked for identification and traceability.
01
Mill Traceability
Heat numbers enable material tracking to original steel mill records.
02
Protective Coating
Black paint, yellow coating, or hot-dip galvanizing is applied based on storage and transport conditions.
03
ISPM 15 Wooden Packaging
Export packaging complies with ISPM 15 phytosanitary requirements.
04
Reinforced Crating
Internal reinforcement is used to prevent movement and protect flange faces during shipment.
05
FAQ
Q: What is the maximum carbon equivalent?
A: Carbon equivalent (CE) is controlled below 0.45% in accordance with weldability requirements.
Q: Do you allow third-party inspection?
A: Third-party inspection such as SGS is accepted for verification of heat numbers and dimensions before shipment.
Q: Can RTJ grooves be machined instead of RF?
A: RTJ machining is available based on customer drawings and specifications.
Q: How are sealing faces protected during shipping?
A: Sealing faces are coated with anti-rust grease and protected with plastic caps before packing.
Q: Are material test reports linked to heat numbers?
A: Yes, EN 10204 3.1 reports are issued with full heat number traceability.
Q: Are bolt holes aligned to standards?
A: Bolt hole orientation is manufactured in accordance with international piping standards.
Q: What coatings are available for humid environments?
A: Bitumen coating and hot-dip galvanizing are available for corrosion protection.
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