China Selective Hardening Manufacturers Factory Suppliers
We uphold the core value of 'creating value for partners' and create value for the Spheroidizing Annealing, Vacuum Carburizing, Selective Hardening industry through independent innovation and sincere cooperation. Our company's business units focus on products and services to enhance the uniqueness and competitiveness of our Selective Hardening. We keep track of key data, such as saving money for the company and customer feedback. We will fully explore the profound connotation of the company and the infinite wisdom of employees, and write a more brilliant chapter in the course of better service for customers. As a result, we've gained a global sales network reaching many international markets. Our team is comprised of highly skilled professionals with years of experience in their respective fields. Our company's organizational structure has the advantages of simplified form, simplified personnel, clear responsibilities and perfect functions.
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Induction Hardening
Induction hardening uses electromagnetic induction to heat specific surface areas of a part — with heating times measured in seconds — followed by immediate water or polymer quenching. The rapid...
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Laser Cutting
We run high-performance fiber laser tube cutters in parallel — dedicated to precision profiling of carbon steel, stainless steel, aluminum, and copper alloy tubes from φ16 up to 120mm.
Key...
Key...
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Cold Heading
Multi-station cold heading is a high-speed metal forming process that shapes wire or rod stock into finished or near-finished components at room temperature through a sequence of extrusion,...
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Hot Forging
Hot forging is a metal shaping process that uses heat — typically 1,000°C to 1,200°C for steel — to reduce flow stress and enable complex deformation in a single press stroke. At these...
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Thread Machining
Thread machining covers multiple processes for creating internal and external threads — rolling, milling, cutting, and grinding. Each method serves different applications: rolling cold-forms...
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Surface Grinding
Surface grinding uses a rotating abrasive wheel to produce flat surfaces with high dimensional accuracy and fine finish — removing oxide layers, correcting distortion, and preparing parts for...
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Spheroidizing Annealing
Spheroidizing annealing transforms the lamellar carbide structure in steel into a spheroidal (globular) form through controlled heating and slow cooling. This reduces hardness, improves...
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Carburizing
Carburizing is a thermochemical process that diffuses carbon atoms into the surface layer of low-carbon steels, increasing surface carbon content to approximately 0.8%. After quenching, this...
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Tempering
Tempering is a mandatory post-quenching heat treatment. Fresh martensite is hard but brittle, with high residual stress. Without tempering, a quenched part is prone to cracking or fracture in...
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Shot Blasting
Shot blasting is a mechanical surface preparation process that propels spherical metal shot at high velocity (65–110 m/s) using a centrifugal wheel . The impact of the shot removes mill scale,...
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Sand Blasting
Sandblasting is an abrasive blasting process that propels sand or other abrasive media against a surface under high pressure, typically using compressed air . The process removes surface...
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Fine Blanking Dies
We design, manufacture, and maintain fine blanking dies entirely in-house — from V-ring geometry and clearance optimization to carbide selection, heat treatment, surface engineering, and ongoing...
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Reasonable prices, high-quality products, and dedicated services are the three eternal pursuits of customers, so our Spur Gear Hobbing, Dry Film Lubricant Coating, Split Bushings with Precision Bore is reasonable in design and reliable in quality, only to meet customer needs. In addition, due to the advanced research and development level, the company can customize non-standard products according to customer requirements. Ningbo Fenghua Bolong Machinery Manufacturing Co., Ltd. is one of the most professional selective hardening manufacturers and suppliers in China, also supports high quality customized service. With abundant experience, we warmly welcome you to buy durable selective hardening made in China here from our factory.


















