Precision Manufacturing Of Small Steel Castings
Our company Tengzhou Tiangong Machinery Co., Ltd. Our company offers a diversified combination of casting processes, including sodium silicate precision casting, silica sol precision casting and coated sand shell casting, which can flexibly meet the different levels of cost and quality...
- Product Introduction
Our company
Our company offers a diversified combination of casting processes, including sodium silicate precision casting, silica sol precision casting and coated sand shell casting, which can flexibly meet the different levels of cost and quality requirements of customers. Relying on over two decades of profound technological accumulation, we have successfully mastered the production technology of over a hundred types of material castings, with product materials covering multiple series such as carbon steel, alloy steel, stainless steel and heat-resistant steel.
At present, the company's overall annual production capacity has reached 5,000 tons, including 2,000 tons of precision castings and 3,000 tons of coated sand castings. Our products and services are widely applied in various fields such as coal mining machinery, construction machinery, conveying equipment, heat treatment and metallurgical equipment, etc., and have a broad market prospect.
types of CNC machining
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Sodium Silicate Precision Casting
Sodium silicate precision casting is a cost-effective investment casting process, well-suited for small steel castings with a certain degree of complexity. Its core advantage lies in excellent cost control, as the sodium silicate binder used is significantly less expensive than other types. This enables the process to offer high cost-effectiveness for customers during large-volume production.
In the precision manufacturing of small steel castings, it consistently ensures dimensional accuracy and surface finish superior to conventional casting methods, sufficient to meet the requirements of many structural components. Consequently, it becomes an ideal choice for producing carbon steel and alloy steel parts in fields such as engineering machinery and conveying equipment.
Silica Sol Precision Casting
Silica sol precision casting represents a higher-tier process, specifically designed for pursuing the ultimate quality in the precision manufacturing of small steel castings. The supporting evidence is its ability to produce castings with exceptionally high dimensional accuracy and superior surface quality. This is because the silica sol binder can form a more refined and higher-strength ceramic shell, resulting in castings with sharp contours and minimal surface defects. This technology is crucial for complex thin-walled parts made from materials like stainless steel and heat-resistant steel, as it significantly reduces the need for subsequent machining.
Therefore, it is widely used in demanding fields such as aerospace and high-end hydraulic valves, where performance and appearance are critical.
Resin-Coated Sand Shell Molding Casting
Resin-coated sand shell molding casting strikes an optimal balance between process flexibility and production efficiency, making it particularly suitable for small to medium-sized steel castings with relatively simple geometries. Its process advantages include fast shell molding speed, good mold adaptability, and the capability to produce castings within a relatively wide size range. By using sand pre-coated with phenolic resin, a hollow sand shell with uniform thickness and high strength can be rapidly formed in heated molds.
This allows it, in the precision manufacturing of small steel castings, to ensure accuracy higher than sand casting while achieving an annual production capacity of up to 3,000 tons, effectively supporting the high demand for durable structural components in sectors like coal mining machinery and metallurgical equipment.
How to choose the right material for your product?
| Material Category | Typical Grades (Examples) | Key Alloying Elements & Typical Composition (wt%) | Primary Characteristics & Applications |
| Carbon Steel | AISI 1020, 1045 | C (0.18-0.45%), Mn, Si | Good strength and toughness, cost-effective. Used for structural parts, machinery components, and low-stress applications. |
| Low-Alloy Steel | 4140, 4340 | C, Cr (0.8-1.1%), Mo (0.15-0.25%), Ni | High strength, good toughness, and wear resistance. Suitable for high-stress parts like gears, shafts, and connecting rods. |
| Stainless Steel | 304, 309,310S,316 | Cr (~18-20%), Ni (~8-12%), (Mo ~2-3% in 316) | Excellent corrosion resistance, good formability. Widely used in food processing, chemical, and architectural applications. |
| Stainless Steel | 17-4PH (630) | Cr (~17%), Ni (~4%), Cu (~3.5%), Nb | Precipitation-hardening grade. High strength, hardness, and corrosion resistance. Used for valves, pump shafts, and aerospace components. |
| Tool Steel | H13 | C (~0.4%), Cr (~5.3%), Mo (~1.5%), V | Excellent hot hardness, wear resistance, and thermal fatigue resistance. Ideal for die-casting molds, extrusion dies. |
| Heat-Resistant Steel | HK40, 310 | Cr (~25%), Ni (~20%), C | Excellent high-temperature strength and oxidation resistance. Used for furnace parts, heat treatment fixtures, and turbine components. |
| Cobalt-Based Alloy | Stellite 6 | Co (Bal.), Cr (~28%), W (~4.5%), C | Outstanding wear resistance, corrosion resistance, and retains hardness at high temperatures. Used for wear-prone parts and cutting tools. |
| Nickel-Based Alloy | Inconel 718 | Ni (Bal.), Cr (~19%), Nb (~5%), Mo, Ti | Superior high-temperature strength, oxidation, and creep resistance. Essential for aerospace turbine blades and high-temperature fasteners. |
Finished Casting Showcase
Frequently Asked Questions
Are there relevant industry certifications?
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We are certified under the ISO 9001:2015 Quality Management System, and our processes and material testing comply with multiple international standards (e.g., ASTM, DIN). Specific certifications can be provided upon request.
What dimensional accuracy and tolerance standards can you achieve?
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This depends on the selected process. Silica sol precision casting can achieve linear tolerances of CT4-6, while sodium silicate precision casting reaches CT6-8. Our engineers will evaluate and confirm achievable tolerances upon reviewing your drawings.
What are the minimum wall thickness and maximum weight limits for castings?
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For precision castings, the minimum wall thickness can be as thin as 0.8mm, with a maximum single piece weight of approximately 50kg. Resin-coated sand castings offer a wider dimensional range. Please share your specific design for a feasibility analysis.
What costs are included in the quotation?
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Our quotations typically cover mold costs, per-unit casting costs, routine non-destructive testing (e.g., dimensional inspection), and basic packaging. Additional services such as heat treatment, machining, specialized testing, and transportation are quoted separately.
How do you ensure consistent and stable casting quality?
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We implement strict process control cards and SOPs at every stage, from raw material inspection to mold shell creation, melting, and pouring. Each batch of molten steel undergoes spectral analysis to ensure chemical composition compliance.
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