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Engineered to withstand aggressive media, extreme temperatures, and high-pressure profiles in modern chemical plants.
JUNLONG Machinery Co., Ltd. was founded in 2014. Located in Weifang, Shandong, the company covers a total area of 60,000 square meters and has an annual production capacity of 20,000 tons of precision castings and machined finished parts. It specializes in materials such as carbon steel, alloy steel, and stainless steel.
With over 200 employees, including more than 30 engineering technicians, the company is a high-quality casting supplier integrating precision casting and deep processing. We deliver world-class components that serve as the backbone for severe-service industrial applications worldwide.
Understanding the critical demands of the modern process industries and the evolution of specialized casting metallurgy.
In modern chemical plants, processing systems are continuously subjected to highly corrosive media, including strong acids, alkaline solutions, organic solvents, and reactive gases. Standard fabricated components often fail at welded joints or experience localized stress corrosion cracking. High-precision casting components offer a seamless, structurally uniform solution. By eliminating weak joints and optimizing fluid dynamic geometry, casting components ensure long-term operational safety, reduce unplanned downtime, and prevent catastrophic chemical leaks.
The commercial demand for these components is rising rapidly. As global environmental regulations tighten, chemical companies must adopt zero-leakage policies. This shift has placed immense pressure on equipment manufacturers to source premium-grade casting components that can endure severe operating conditions without degradation. Consequently, investment casting (lost wax process) has become the gold standard for producing complex pump casings, valve bodies, impellers, and instrumentation manifolds.
Selecting the right alloy is paramount for corrosion resistance. JUNLONG Machinery utilizes advanced induction melting furnaces and spectrometer analysis to strictly control the chemical composition of castings. Our primary material classes include:
Why leading global chemical equipment manufacturers partner with JUNLONG Machinery.
We combine advanced automation, metallurgical expertise, and global supply chain compliance to deliver unmatched casting quality.
Equipped with internationally advanced automated casting production facilities and comprehensive physical and chemical analysis equipment, the company significantly enhances manufacturing efficiency and product quality stability while meeting comprehensive testing requirements for the mechanical properties of different materials.
Leveraging strong engineering capabilities, a complete quality control system, and advanced management systems, the company has become a well-known brand manufacturer in the field of precision casting both domestically and internationally. Its products are exported to overseas markets, including Germany, the United States, Italy, Canada, and other countries.
The company also serves as a key supplier of high-tech precision castings for industries such as automotive, rail transportation, engineering machinery, material handling machinery, agricultural machinery, and petroleum machinery. We provide high-quality products, services, and solutions to global industry leaders and mid-to-high-end clients in Europe and America.
Exploring how precision cast components perform under real-world, severe-service conditions.
Pumps are the heart of any chemical processing plant, moving volatile, corrosive, and abrasive fluids under high pressures. The internal components, particularly the impeller and volute casing, are subject to high velocity fluid flows that can cause rapid erosion-corrosion. By utilizing our precision lost wax casting, we achieve smooth internal surface finishes (low roughness values) that minimize hydrodynamic friction and wear. This precise geometry reduces cavitation risks, increases pump efficiency, and extends the operational lifecycle of the pump assembly.
In process automation, control valves must regulate flow rates with high precision. Any internal defect, such as gas porosity or shrinkage in the valve body casting, can lead to localized wall thinning and eventual failure under pressure. Our automated casting lines and rigorous non-destructive testing (NDT) ensure that every valve body cast from 316 stainless steel or high-alloy steel is pressure-tight and free of subsurface defects, meeting the strict requirements of ASME and API standards.
Chemical reactors operate under elevated temperatures and pressures to facilitate chemical synthesis. Agitators and mixing blades inside these reactors must withstand both mechanical torque and aggressive chemical attacks. Our custom high-alloy steel casting processes allow us to produce complex, single-piece agitator components with optimized grain structures that prevent stress corrosion cracking along grain boundaries, guaranteeing safe and continuous reactor operations.
Furthermore, the company has obtained ISO 9001, TS 16949, UL, and other quality management system certifications, ensuring process control over every production detail and continuously pursuing and improving product quality to achieve high customer satisfaction.
Embracing AI-driven design, smart metallurgy, and green foundry technologies to shape the next generation of corrosion-resistant components.
The integration of digital technologies has revolutionized the traditional foundry. By utilizing advanced casting simulation software, our engineers can model the mold-filling and solidification processes before pouring the molten metal. This virtual prototyping predicts potential hotspots, shrinkage cavities, and gas entrapment areas. By adjusting gating systems and feeder sizes digitally, we achieve near-zero defect rates on the first physical run, saving time, reducing material waste, and lowering costs for our global clients.
As chemical processes become more aggressive, the demand for modified alloys like 316L (Ultra-Low Carbon) and specialized super-alloys has escalated. Reducing carbon content prevents chromium carbide precipitation during cooling, which otherwise leaves the grain boundaries susceptible to intergranular corrosion. Additionally, modern casting validation requires rigorous testing protocols. JUNLONG Machinery implements advanced spectroscopic verification, ASTM G48 corrosion testing, and high-pressure hydro-testing to guarantee that each casting meets the exact metallurgical specifications required for severe chemical processing environments.
State-of-the-art automated casting lines, precision machining tools, and comprehensive testing facilities.
Our company will continue to strengthen research and development efforts for new products and technologies, integrate advanced management and technical resources, build a powerful brand, and strive to become a world-class precision casting supplier!
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Browse our comprehensive range of high-precision casting components engineered for severe industrial applications.
