Manufacturing Capabilities

From Raw Material to Finished Casting – Complete In-house Manufacturing

At BOPENG Steel Casting, quality is built into every stage of production. With decades of casting experience, advanced manufacturing facilities, and a skilled workforce, we provide a complete in-house production system covering pattern making, molding, melting, pouring, heat treatment, machining, inspection, and final delivery.
By controlling every critical process internally, we ensure stable quality, shorter lead times, and reliable performance for every cast steel component.

Wooden Pattern Workshop

Wood patterns serve as the foundation of casting quality and dimensional accuracy.
BOPENG owns a dedicated pattern-making team capable of independently completing customized wood pattern design, manufacturing, repair, and maintenance. This in-house capability reduces outsourcing costs and communication delays while significantly shortening production cycles.
Our experienced pattern makers possess extensive expertise in large and complex casting patterns, ensuring excellent dimensional accuracy and process reliability.

Advantages

In-house pattern manufacturing

Faster production lead times

Lower overall manufacturing costs

High dimensional accuracy

Two dedicated pattern warehouses for long-term customer pattern storage

Molding Workshop

The molding process directly affects casting dimensions, surface finish, and internal quality. BOPENG operates: – 8 professional molding pits.
– 8 medium and heavy-duty overhead cranes.
– More than 80 skilled molding technicians with over 10 years of experience. Our dedicated process engineers provide on-site supervision throughout production to ensure every molding operation strictly follows technical requirements and quality standards.

Molding Technologies

Sodium Silicate Sand Process

Provides excellent mold strength, dimensional stability, and suitability for large steel castings.

South African Chromite Sand

Applied in critical casting areas and hot spots to: Prevent sand burn-on, Reduce penetration defects, Improve casting surface quality, Enhance internal soundness.

Steel Melting Workshop

The quality of molten steel determines the performance of the final casting.
BOPENG strictly controls the entire melting process to ensure stable chemical composition and mechanical properties.

Melting Control

– Precise control of alloy composition.
– Strict sulfur (S) and phosphorus (P) limitation.
– Stable chemical analysis.
– Uniform mechanical properties.
By minimizing harmful elements, we significantly improve casting strength, toughness, and service life.

Advanced Pouring Technology

Before pouring, mold cavities undergo specialized treatment to reduce secondary oxidation of molten steel.
Benefits include:
– Improved internal quality. – Higher casting density.
– Reduced inclusions. – Lower defect rates.
Better mechanical performance.

Heat Treatment Workshop

Heat treatment is essential for achieving required mechanical properties.
Our workshop utilizes intelligent temperature-controlled furnace systems capable of performing: Heat Treatment Processes: – Annealing – Normalizing
– Tempering – Stress Relieving The high-precision control system ensures uniform heating and cooling, optimizing microstructure and mechanical performance. Benefits: Improved toughness, Enhanced strength, Better wear resistance, Reduced internal stress, Stable performance.

Finishing & Grinding Workshop

After casting and heat treatment, each product undergoes comprehensive finishing operations.
BOPENG employs over 70 experienced grinding and finishing workers who efficiently remove risers, gates, burrs, and surface imperfections. Capabilities: – Surface cleaning – Defect removal
– Dimensional correction – Weld repair when required
– Final finishing preparation This ensures every casting meets appearance and dimensional requirements before machining.

Machining Workshop

To provide finished or semi-finished components, BOPENG is equipped with large-scale CNC machining equipment.

Main Equipment

CNC Vertical Lathe – Φ10m
CNC Vertical Lathe – Φ8m
CNC Vertical Lathe – 2 × Φ6.3m
Boring Machine – 160 Type
Gear Hobbing Machine – 3 × Φ8m
Boring Machine – 4 × 10m
These machines enable us to manufacture large, heavy-duty cast components with high precision.

Machining Services

Turning

Boring

Milling

Gear Hobbing

Drilling

Precision Finishing

Shot Blasting Workshop

BOPENG utilizes a fully automatic shot blasting system capable of processing up to 70 tons per batch.
Features: – Shot size: 1–2.5 mm
– Capacity: 70 tons per cycle
– Fully automated operation Benefits: – Removes scale and residual sand
– Improves surface cleanliness
– Enhances coating adhesion
– Reduces finishing time
– Improves appearance quality

FAQ

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Steel casting and steel forging are two different manufacturing processes used to produce high-strength steel components, but they create different material structures and design advantages.
Steel forging forms metal through mechanical deformation under high pressure, which improves grain flow and is often selected for parts requiring extremely high fatigue resistance and directional strength. Steel casting, on the other hand, produces components by pouring molten steel into a precisely designed mold, allowing manufacturers to create complex geometries, large structures, and integrated components that would be difficult or impossible to manufacture through forging.
For many heavy industrial applications, steel casting provides significant advantages because it allows complex shapes, internal passages, thick sections, and customized designs while maintaining excellent strength, toughness, and wear resistance. This makes cast steel widely used for mining machinery, construction equipment, railway components, pump bodies, valve components, and power generation equipment.
The selection between casting and forging depends on factors such as component size, structural complexity, mechanical requirements, production volume, and operating environment. A professional steel casting manufacturer can help determine the most suitable process according to the actual application requirements.

Choosing the correct steel grade is one of the most important steps in designing a reliable steel casting component. The ideal material depends not only on strength requirements but also on the working environment, temperature, corrosion exposure, impact loads, and wear conditions.
Carbon steel castings are commonly selected for general industrial applications where good strength, machinability, and cost efficiency are required. Alloy steel castings are preferred for more demanding conditions because alloying elements such as chromium, nickel, molybdenum, and manganese can improve hardness, toughness, heat resistance, and wear performance.
For example, mining equipment components often require high impact resistance and abrasion resistance, while valve bodies and pump components used in energy or chemical industries may require corrosion resistance and high-temperature stability.
During material selection, engineers usually consider mechanical properties such as tensile strength, yield strength, elongation, hardness, impact toughness, and heat treatment requirements. A properly selected steel grade ensures that the casting performs reliably throughout its service life rather than simply meeting initial specifications.

Mining and heavy construction equipment operate under some of the most severe working conditions, including heavy impact, continuous vibration, abrasive materials, and extreme loading cycles. These environments require components with exceptional strength and durability.
Steel castings are widely used in these industries because they provide an excellent balance of mechanical strength, impact resistance, and design flexibility. Components such as crusher parts, excavator components, structural brackets, machine frames, and wear-resistant parts can be manufactured with complex shapes while maintaining high load-bearing capability.
Compared with other materials, steel castings can be engineered with specific alloy compositions and heat treatments to achieve improved hardness, toughness, and fatigue resistance. This makes them suitable for equipment that must operate continuously in mines, quarries, and heavy industrial environments.
The ability to produce large and complex components is another important advantage of steel casting, especially for heavy machinery where welded assemblies may introduce additional stress concentration points.

Steel casting quality depends heavily on controlling the entire manufacturing process, from melting and mold preparation to pouring, solidification, and heat treatment.
Common casting defects may include shrinkage cavities, gas porosity, inclusions, cracks, and dimensional variations. These issues usually result from factors such as improper molten steel treatment, incorrect pouring temperature, poor feeding design, uncontrolled cooling rates, or inadequate process parameters.
Professional foundries use multiple methods to reduce casting defects, including chemical composition control, simulation-assisted mold design, riser optimization, advanced melting technology, and strict inspection procedures.
Quality verification may include visual inspection, dimensional measurement, ultrasonic testing, magnetic particle testing, radiographic testing, and mechanical property testing. These inspection methods help ensure that steel castings meet customer specifications and perform safely in demanding industrial applications.

Heat treatment plays a critical role in improving the mechanical properties and long-term reliability of steel castings.
After casting, the internal structure of steel may contain residual stress and uneven microstructures caused by the cooling process. Heat treatment processes such as normalizing, annealing, quenching, and tempering help refine the grain structure, relieve internal stress, and achieve the required combination of strength, hardness, and toughness.
For heavy-duty applications, heat-treated alloy steel castings can provide significantly improved resistance against impact loads, fatigue failure, and mechanical deformation. For example, components used in mining machinery, railway equipment, and industrial processing systems often rely on carefully controlled heat treatment to achieve stable performance under continuous operation.
The correct heat treatment process depends on the steel grade, casting size, wall thickness, and final application requirements.

Custom steel castings are used across many industries where components require high strength, durability, and complex geometries.
Major application areas include mining equipment, construction machinery, oil and gas systems, power generation equipment, railway transportation, marine engineering, industrial pumps and valves, and heavy manufacturing machinery.
In the mining sector, steel castings are commonly used for wear-resistant and load-bearing components. In oil and gas applications, cast steel components are selected for their ability to withstand pressure, temperature variations, and harsh operating environments. Power generation and energy industries also rely on steel castings for critical equipment requiring high reliability.
Because steel casting allows manufacturers to create large, complex, and customized components, it remains an important manufacturing solution for industries requiring performance beyond standard fabricated parts.

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