Why Choose Our Flange Casting
- 27 years of experience in manufacturing flange castings
- Use 304/316L to make flange castings
- Provide Non-Destructive Testing
- 100% Air Testing and Pressure Process
- Provide Spectrometer Analysis
- Provide 3D Rapid Prototyping
- Provide Perfect Surface Treatment
Flange Casting Foundry in China
As a professional flange investment casting foundry in China, we are committed to providing you with custom, fully machined flange castings made of 304/316L (CF8/CF3M) stainless steel that offer high precision, corrosion resistance, high-pressure resistance, and complex structures. Over the past 27 years, we have established long-term, stable partnerships with nine companies, achieving an annual output value of $8 million.
We have also helped numerous clients resolve flange casting-related issues. Through a high-precision investment casting process, we provide you with flange castings with complex structures, such as special-shaped fixed flange castings with elbows. In addition, we perform 100% airtightness testing on your components to ensure that the sealing surfaces and bolt-hole walls are completely leak-free.
Flange Castings We Make
Features a short neck; primarily used for fluid piping in low-pressure applications with relatively low stress.
Features a tapered, long neck with a high protrusion, primarily used in high-pressure operating conditions.
It has no through-hole in the middle and is used to seal the end of a pipe or shut off the flow of a medium.
The inner bore is internally threaded and is used in low-pressure piping systems containing flammable gases.
The flange itself is not permanently secured and is used in special systems that require frequent disassembly.
Why do you need flange castings made from 304/316L?
The passivation film on the stainless steel surface effectively protects the flange castings from corrosion by strong acids and other corrosive media, and the 316L grade significantly reduces the probability of intergranular corrosion and pitting corrosion.
Flange Castings typically need to be welded to pipe fittings. The ultra-low-carbon properties of flange castings made of 316L prevent the precipitation of chromium carbide during welding, thereby reducing the risk of intergranular corrosion.
Stainless Steel possesses extremely high ductility and toughness, which means that flange castings made from it will undergo minimal deformation when subjected to internal fluid expansion pressure and external bolt shear stress, without suffering brittle fracture.
Flange Castings made of 304/316L offer exceptional temperature adaptability. Whether at -196°C or 600°C, they ensure that flanges maintain high tensile strength and pressure-bearing capacity, and keep the sealing surfaces from warping.
Standard Material Control
Changes in the composition of stainless steel directly affect the properties of castings, especially flange castings made from 316L. If the carbon and molybdenum do not meet the standards, it may lead to intergranular and pitting corrosion in flange castings. However, we use a spectrometer to control the carbon content below 0.03% and the molybdenum content at 2%-3%, ensuring that the sealing surface of flange castings will not rust.
Precision Geometric Control
Flange castings must form a perfect seal with pipe castings, so precise dimensional control is critical. We use HEXAGON coordinate measuring machines to ensure zero deviation in the pitch circle diameter and positional accuracy of the flange bolt holes, while ensuring the coaxiality of the flange’s inner cavity and outer circumference, resulting in a perfectly uniform wall thickness that easily elevates the flange’s pressure-containing capability.
Perfect Surface Treatment
Surface treatment is a critical process that determines the corrosion resistance of flange castings. We offer standard shot blasting, pickling and passivation, and polishing processes to ensure that surface impurities and microscopic burrs on the sealing surfaces and in the internal cavities are thoroughly removed. This process reforms a passivation film, preventing iron ions from contaminating the castings and ensuring their corrosion resistance.
Rapid Prototyping
Flange castings are critical assembly components with very little tolerance for error. If deviations in the design of the flange’s bolt holes are discovered after casting is complete, it could result in significant losses for you. We offer 3D technology, allowing you to use prototypes to test for perfect compatibility with your existing mechanical systems and to verify the flange casting’s sealing performance and pressure resistance, thereby reducing your losses.
Certified to Meet Global Standards for High-Pressure Equipment
Your Reliable Manufacturing Partner for Flange Casting
With 27 years of precision investment casting experience, 18 years of precision CNC machining experience, and 11 years of mold development experience, we have full casting capabilities, including customizing flange castings to your specific designs, including flanges with special cavities, reinforcing ribs, or special-shaped fixed flange castings.
Moreover, as a one-stop foundry, we can provide you with high-quality flange castings. During casting, we will reduce subsurface porosity by optimizing the gating system. Once the castings are complete, we perform 100% airtightness testing and non-destructive testing on the flange castings to ensure there is no shrinkage or porosity inside the flange neck or the transition zone where the flange is welded to the pipe.
Diverse Applications for Stainless Steel Flange Castings
The chloride ions in the ocean cause flange castings made of ordinary carbon steel to easily form pitting corrosion. In contrast, our flange castings, made of 316L, offer exceptional resistance to pitting corrosion. This prevents some microscopic crevices from corrosion, such as flange sealing surfaces and bolt holes, which are highly prone to seawater accumulation.
Flange castings are used to connect pump castings and piping systems, which are exposed to corrosive and high-temperature conditions in the chemical industry. Our stainless steel flange castings, particularly made of 316L, have a passivation layer on their surfaces that effectively resists corrosion from organic acids, industrial chemicals, and other corrosive media.
The food industry imposes high hygiene standards on flange castings. Compared to carbon steel, which can leach iron ions that contaminate food, our stainless steel flange castings. Their chemical inertness prevents them from reacting with food, and the smooth surface achieved by investment casting makes it difficult for food residue to accumulate, ensuring food purity.
Flange castings are primarily used in exhaust pipe connections, where they must withstand high pressure, severe vibrations, and thermal cycling. Our stainless steel flange castings offer exceptional high-temperature stability after solution heat treatment; their internal structure is highly stable, enabling them to withstand thermal fatigue caused by thermal cycling.
Your Reliable Manufacturing Partner in China
The flange castings supplied by the foundry we used to cooperate with always had misaligned bolt holes, which meant we had to wait, significantly delaying our system operation. Until we started working with Pingheng Machinery, we found their stainless steel flange castings had no dimensional errors and fit our mechanical system perfectly. I believe we will continue to work with them.
——Marcus Vance, Chief Quality Engineer
In the past, when we collaborated with other factories, we would simply receive a batch of castings, which did not allow us to know the quality. However, since we started working with Pingheng Machinery, they have provided us with air-tightness and non-destructive testing reports every time they deliver flange castings, which gives us complete confidence in the quality of these castings.
——David Koenig, Procurement Manager
They are all austenitic stainless steels. The main difference between them is that 316 stainless steel contains 2％-3％ molybdenum, which gives it greater resistance to pitting corrosion than 304 stainless steel. 316L is an ultra-low-carbon variant of 316; it does not exhibit carbide precipitation at high temperatures, thereby reducing the possibility of corrosion in flange castings made from it.
If you want to know more about this, please click “304 vs 316 Stainless Steel – the Ultimate Guide for Beginners and Experts”
Yes, we offer 3D prototyping services for efficient small-batch customization of flange castings, with delivery within 7–10 days.
Using the investment casting process, the stainless steel flange castings we currently manufacture can reach a maximum diameter of 24 inches.
Yes. As a professional foundry, we manufacture stainless steel flange castings in strict accordance with global standards, including ASME B16.5 (Class 150/300/600), ensuring our flange castings can fit into your systems.
We use a one-stop customization service, from mold design and fabrication to CNC machining. In this process, our flange castings are typically delivered within 45 days.
