A105 Forged Pipe Flange

ASTM A105 forged pipe flange is the most widely used carbon steel integral forging fitting for petrochemical, power energy, heating pipeline and pressure vessel industries. Manufactured in accordance with ASTM A105 / SA105 international standards, it is specially designed for industrial pressure piping systems.

Different from ordinary welded plate flanges and cast flanges, A105 flanges are integrally forged from solid steel ingots or round steel bars with professional heat treatment. The forging structure features uniform and dense metallographic texture without lamination, porosity or shrinkage cavity. It fundamentally avoids leakage, cracking and insufficient pressure resistance problems commonly found in welded and cast flanges.

As a universal medium-high temperature and medium-high pressure pipe connector, A105 flange is suitable for water, steam, natural gas, light oil and conventional chemical fluids. It is a detachable, maintainable and reusable sealing component for pipes, valves, filters, flow meters, pressure vessels and equipment nozzles, widely applied in domestic and overseas engineering projects and complete set equipment exports.

All A105 flanges adopt integral die forging technology without splicing, welding or partial forging. The complete production process is strictly controlled:

1. Raw material re-inspection: Verify material certificates and conduct PMI spectral inspection to ensure chemical composition and mechanical properties meet standards;

2. Constant temperature heating: CNC furnace precise heating and heat preservation to avoid overheating and coarse grain structure;

3. Integral forging: Heavy-duty forging press forms continuous metal fiber structure, improving overall strength and tear resistance;

4. Professional heat treatment: Normalizing + tempering eliminates forging internal stress, refines grains and prevents deformation and cracking in service;

5. Rough machining: Uniform margin reservation for high-precision finish machining;

6. CNC finish machining: Precise processing of sealing face, bolt holes, welding bevel and overall dimension to guarantee flatness, verticality and concentricity;

7. Surface treatment: Sand blasting for rust and oxide removal, burr-free surface, with blackening, anti-rust oil and galvanization optional;

8. Strict final inspection: NDT inspection, full dimension check, hardness test and mechanical property sampling test before delivery.

● Wide temperature adaptability: Stable service temperature ranges from -29℃ to 425℃, covering low temperature, normal temperature and high-temperature steam working conditions for thermal power, heating and chemical pipelines.

● Strong pressure bearing capacity: Full pressure classes from Class150 to Class2500, suitable for low-pressure municipal pipelines and high-pressure process pipelines. High-class flanges adopt thickened reinforcement with sufficient safety margin.

● Durable sealing performance: Precisely machined sealing face ensures excellent flatness and roughness. It matches rubber gaskets, PTFE gaskets, spiral wound gaskets and metal ring gaskets perfectly, realizing anti-leakage performance under long-term high temperature and high pressure.

● Stable mechanical properties: Tensile strength ≥485MPa, yield strength ≥250MPa, elongation ≥22%, maximum hardness ≤187HBW. Uniform batch performance ensures strong resistance to impact, vibration and thermal fatigue for frequently started and fluctuating pipelines.

● High safety factor: Integral forging without welding seams eliminates hidden welding defects. All products pass standard NDT inspection and can be used for special pressure pipeline equipment supporting.

Applicable Media: Industrial water, circulating water, high-temperature steam, heat conduction oil, diesel, gasoline, crude oil, natural gas, compressed air and conventional neutral chemical fluids.

Application Industries: Oil & gas exploitation and transportation, petrochemical refining, fine chemical complete plants, thermal power, hydropower, new energy supporting systems, municipal central heating networks, marine engineering, pressure vessel equipment, metallurgical pipelines, industrial water treatment and mechanical equipment export projects.

A105 forged flanges adapt to harsh working environments including outdoor exposure, high temperature radiation, temperature alternation and pipeline vibration, featuring low failure rate and low maintenance cost.

Integral forging compact structure without welding defects; stress-relief heat treatment ensures no deformation or cracking; wide temperature and pressure adaptability; stable sealing performance; complete specifications and customizable non-standard products; strict quality control and complete certification documents. It is a safe, durable and cost-effective core matching product for industrial pressure piping systems.

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