ASTM A105 Flange Distributor in China Selection Guide
Finding reliable carbon steel flange suppliers near you requires understanding material specifications, pricing factors, and quality certifications. This comprehensive guide helps you identify trustworthy ASTM A105 flange distributors in China.
ASTM A105 Material Specifications
ASTM A105 is the standard specification for carbon steel forgings for piping applications:
Chemical Composition
| Element | Percentage |
|---|---|
| Carbon (C) | 0.35% max |
| Manganese (Mn) | 0.60-1.05% |
| Phosphorus (P) | 0.035% max |
| Sulfur (S) | 0.035% max |
| Silicon (Si) | 0.10-0.35% |
Mechanical Properties
- Tensile Strength: 70,000 psi (485 MPa) minimum
- Yield Strength: 36,000 psi (250 MPa) minimum
- Elongation: 22% minimum
- Reduction of Area: 30% minimum
- Hardness: 187 HB maximum
Carbon Steel Flange Suppliers Selection Criteria
Manufacturing Capabilities
- Forging capacity and equipment
- CNC machining centers
- Heat treatment facilities
- Quality control laboratory
- Production capacity per month
Certifications Required
- ISO 9001:2015 Quality Management
- PED 2014/68/EU for European export
- CE Marking authorization
- ADWO-2000 for pressure equipment
- Third-party inspection approval (SGS, BV, TUV)
Price Factors for Carbon Steel Flanges
Raw Material Costs
- Steel billet prices fluctuate monthly
- Forging vs cut plate (forging costs 20-30% more)
- Material grade (A105 vs A350 LF2)
Manufacturing Costs
- Size and weight of flange
- Pressure class (150 vs 2500)
- Surface treatment requirements
- Testing and inspection requirements
Typical Price Ranges (2024)
| Size | Class | Price Range (USD) |
|---|---|---|
| DN50 (2″) | 150 | $3-5 per piece |
| DN100 (4″) | 150 | $8-12 per piece |
| DN150 (6″) | 150 | $15-22 per piece |
| DN200 (8″) | 150 | $25-35 per piece |
| DN300 (12″) | 150 | $55-75 per piece |
Quality Control Procedures
In-House Testing
- Spectrometric analysis for chemical composition
- Tensile and yield strength testing
- Hardness testing per batch
- Dimensional inspection with CMM
- Visual examination per ANSI/ASME standards
Third-Party Inspection
- SGS, BV, TUV, LR inspection available
- Material verification per heat number
- Pressure testing witness
- Final inspection before shipment
Export Documentation
- Commercial Invoice
- Packing List
- Bill of Lading
- Certificate of Origin
- Material Test Reports (MTR) EN 10204 3.1
- CE Certificate (for Europe)
- Form A (for preferential tariff)
Lead Time and Delivery
Production Schedule
- Standard items in stock: 3-5 days
- Regular production: 15-20 days
- Custom sizes: 25-30 days
- Large diameter: 30-45 days
Shipping Options
- Sea freight: 20-35 days to major ports
- Air freight: 5-7 days (for samples)
- Rail freight: 15-20 days to Europe
Payment Terms
- T/T: 30% deposit, 70% before shipment
- L/C at sight for large orders
- Western Union for samples
- Alibaba Trade Assurance available
Songhai Flange is a professional ASTM A105 flange distributor in China with CE certification for export. We supply carbon steel flanges at competitive prices with complete documentation and third-party inspection services.
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