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Precision Casting in Carbon Steel
Core Material Advantages
We primarily adopt high-quality carbon steel grades, with 45# carbon steel as the most widely used variant, supplemented by other customizable grades (e.g., 20#, 35#, Q235) to meet diverse application requirements:
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Superior Mechanical Properties: Featured with balanced strength and ductility, the as-normalized carbon steel castings have a tensile strength of ≥600MPa, yield strength of ≥355MPa, and elongation of ≥16%, capable of withstanding static loads, mild dynamic loads and impact forces, avoiding deformation or brittle fracture.
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Excellent Machinability: The carbon steel castings have good cutting performance, with low cutting resistance and easy chip removal. After processing, the surface roughness can reach Ra≤1.6μm, which is suitable for subsequent turning, milling, drilling, grinding and other precision processing processes.
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Cost-Effective & Easily Accessible: Compared with alloy steel and stainless steel precision castings, carbon steel precision castings have obvious cost advantages, with mature raw material supply chains and stable delivery cycles, making them the preferred choice for large-batch industrial production.
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Customizable Heat Treatment: Through quenching, tempering, surface hardening and other heat treatment processes, the hardness and wear resistance of the castings can be adjusted on demand (hardness up to HRC55-60 after quenching and low-temperature tempering), adapting to high-wear and high-strength working conditions.
Advanced Production Process
The carbon steel precision castings are manufactured through strict investment casting (lost wax casting) process, ensuring every detail meets international standards:
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Wax Mold Making: Using high-quality low-temperature wax with stable melting point and low shrinkage (linear shrinkage ≤0.8%), the wax mold is made by precision injection molding, with burr ≤0.03mm and accurate dimensional deviation reserved for alloy shrinkage.
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Shell Making: Adopting zircon sand and silica sol as core materials, the shell is coated with 3-8 layers (fine sand for surface layer, coarse sand for back layer) to ensure high strength and good air permeability, avoiding casting defects such as air holes and sand inclusions.
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Dewaxing & Roasting: The shell is dewaxed with high-pressure steam (dewaxing rate ≥99%) and roasted at 1000-1150℃ for 2-4 hours to remove residual wax and moisture, and improve shell strength.
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Melting & Pouring: Using vacuum induction furnace for melting, with real-time composition detection by direct-reading spectrometer to ensure key element deviation ≤0.02% and harmful elements (S, P) controlled within standard range. The pouring temperature is precisely controlled at 1520-1560℃ to ensure good fluidity of molten steel.
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Post-Processing: Through sand cleaning, heat treatment, surface sandblasting, pickling and other processes, the castings achieve smooth surface, no defects, and meet the required mechanical properties and dimensional accuracy.
Key Product Specifications & Quality Control
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Dimensional Accuracy: Tolerance ±0.05~0.1mm, complying with ISO 8062 CT4-CT6 standard, key dimension CPK ≥1.33.
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Surface Finish: Ra≤1.6μm (up to Ra≤0.8μm after precision polishing), no burr, no scratch, no oxidation.
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Quality Inspection: Full-process inspection including dimensional measurement (CMM), surface inspection (PT), internal inspection (RT/UT), mechanical property test (tensile, impact, hardness test), material composition inspection, ensuring 100% qualified products.
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Customization: Accept custom design, size, shape and heat treatment scheme, applicable to small-batch, medium-batch and large-batch production, minimum order quantity (MOQ) is negotiable.
Application Fields
Our carbon steel precision castings are widely used in various industrial fields, especially suitable for manufacturing core components that require high precision, good mechanical properties and cost-effectiveness:
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Mechanical Transmission: Transmission shafts, gears, worm gears, connecting rods, crankshafts, bushings, pins.
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Engineering Machinery: Pump bodies, valves, flanges, bearing seats, hydraulic components, construction machinery brackets.
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Power Industry: Cable protectors, power fittings, transformer components, power transmission accessories.
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Automotive Industry: Engine accessories, brake components, clutch parts, automotive brackets.
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General Industry: Hardware tools, fasteners, industrial structural parts, custom precision casting components.
Our Advantages
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Professional R&D Team: With years of experience in precision casting, we can provide customized solutions according to customer needs.
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Advanced Production Equipment: Equipped with industrial-grade 3D printing wax mold equipment, vacuum induction furnaces, automatic shell making lines and precision inspection equipment, ensuring stable product quality.
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Global Service: Provide one-stop service from product design, sample development, mass production to logistics and after-sales, supporting OEM/ODM cooperation.
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Green Production: Adopt environmentally friendly materials and processes, realize waste wax recycling (recovery rate ≥95%) and waste sand regeneration (recovery rate ≥80%), complying with global green manufacturing standards.
