Our ASTM A105 Carbon Steel Flanges deliver reliable performance for general service applications. The precise chemistry (max 0.35% carbon per ASTM A105) ensures excellent weldability and formability - that's why major refineries specify this material for non-corrosive systems operating below 425°C.
With tensile strength of 485-655 MPa and yield strength min 250 MPa (verified by third-party mill certs), these flanges handle PN20 to PN100 pressure ratings effortlessly. Compared to stainless alternatives, our A105 material cuts project costs by 30-50% when corrosion resistance isn't critical. We stock all standard ASME B16.5 face types (FF/RF/RTJ) from 1/2" to 24".
We offer two surface treatments: black oxide coating (per ASTM D769) for rust resistance during storage, and phosphatized (with a 5-7μm layer) to improve paint adhesion for outdoor use. The black oxide finish passes 500-hour salt spray tests (ASTM B117) with minimal corrosion.
Our cutting service handles lengths from 2m to 10m with ±1.5mm tolerance, using high-speed band saws that leave smooth edges. We also provide flange facing (per ASME B16.5) with a 3.2μm surface roughness, ensuring tight seals, and add grease to bolt holes to prevent thread damage during transit.
As a Chinese manufacturer with 10 years supplying EU construction and machinery sectors, we operate 10 forging lines (including 4 from SMS Group) with a 15,000-ton annual capacity-one of the few factories in Asia that can produce A105 flanges up to 60 inches in diameter.
Our quality checks include ultrasonic thickness testing (ASTM E169) with 0.01mm precision, and every batch undergoes a hardness test (Rockwell B 60-80, per ASTM E18). We keep 800-1000 tons in stock at our Ningbo warehouse, with real-time inventory updates on our site-FOB Ningbo shipments for in-stock items leave within 72 hours.
Orders over 100 tons qualify for a 6% discount, plus free black oxide coating and 10% of sea freight covered to Antwerp or Savannah.
Here's our guarantee: If any A105 Carbon Steel Flange fails to meet ASTM A105 mechanical standards or has dimensional errors exceeding ±0.5mm, we'll replace it within 5 days and refund all shipping costs. We also offer a 30-day price lock on confirmed orders, with the option to extend by 15 days for repeat clients.
Product Name
ASTM A105 Flange
Carbon steel (ASTM A105 standard)
Mechanical Properties
Pressure Rating
Class 150-2500
Nominal Diameter
DN15-DN600 (1/2"-24")(Customizable)
Weld Neck, Slip On, Socket Weld, Blind, Threaded
Standards Compliance
ASTM A105, ASME B16.5
Tensile Strength (MPa)
Corrosion Resistance
Applicable Temp Range
ASTM A105 Carbon Steel
General (needs coating)
-29°C to 343°C
304 Stainless Steel
Good (resists rust)
-270°C to 870°C
A350 LF2 Alloy Steel
Better than A105
-46°C to 343°C
Service Type
Custom Sizing
Non-standard diameter, thickness
Surface Treatment
Anti-rust coating, galvanizing
Certifications
MTR, ISO 9001, Hydrostatic test report
Order Flexibility
MOQ 1, urgent orders (3-5 days)
Recommended Pressure Rating
Key Advantages
Oil & Gas
Class 300-1500
High strength, cost-effective
Chemical (Non-corrosive)
Class 150-600
Suitable for low/medium pressure
Municipal Engineering
Class 150-300
Easy installation
Power Generation
Class 600-2500
Withstands high pressure
Frequently Asked Questions
Q: How long does it take to produce a custom order with special specifications?
A: It usually takes 25-30 days, depending on the complexity of the design. We'll confirm the exact lead time after evaluating your requirements.
Q: Can you provide a detailed product catalog?
A: Sure, we'll send you a digital catalog with specifications, prices, and photos via email. Just let us know your specific needs.
