Jiangsu Shengrong produces a variety of steel castings, including low-carbon cast steel (carbon content <0.25%), medium-carbon cast steel (carbon content 0.25%-0.60%), high-carbon cast steel (carbon content >0.60%), low-alloy cast steel (total alloy content <5%), and high-alloy cast steel (total alloy content >10%). Our steel castings feature excellent mechanical properties, precise dimensional and geometric accuracy, a dense and uniform internal structure, superior surface quality, and stable environmental resistance.
Our steel casting parts reliable quality, precise size, reasonable price and short delivery time. OEM accroding to drawing from 0.5kg-1000kgs
High Strength and Toughness: Tensile strength, yield strength, and elongation meet or exceed standards (such as ASTM and ISO), allowing it to withstand high loads and impact.
Excellent Hardness and Wear Resistance: Suitable for abrasive environments (such as mining machinery and gears).
Uniform Performance Distribution: Consistent mechanical properties across all parts, with no localized weak spots.
Low tolerances: Meet drawing requirements, reducing subsequent processing costs.
Clear contours: Detailed edges, corners, holes, and other details are intact, free of deformation or collapse.
Surface finish: Low roughness (e.g., Ra ≤ 12.5μm) reduces machining allowances.
Low defect rate: Free of shrinkage cavities, pores, slag inclusions, cracks, etc. (detectable by X-ray and ultrasonic testing).
Fine grain structure: Achieved through optimized casting processes (such as controlled cooling rate and the addition of refiners).
Uniform chemical composition: No segregation, consistent distribution of alloying elements.
Free of surface defects: no sand buildup, cold shut, wrinkles, or scale.
Suitable for coating/heat treatment: The surface is easily carburized, quenched, and other treatments.
Crack-free welds: Proper carbon equivalent (CE) control prevents weld cracking.
Easy to cut: Moderate hardness minimizes tool wear.
Corrosion Resistance: Alloy steels are selected for specialized environments (such as seawater-resistant Mn-Cu steel).
High/Low Temperature Resistance: Oxidation-resistant at high temperatures and toughness at low temperatures (e.g., impact energy meets standards at -40°C).
Steel castings are used in the following applications:
Construction machinery: load-bearing components (such as gears, bearing seats, and track shoes) for excavators, cranes, and bulldozers.
Mining equipment: Wear- and impact-resistant parts such as crusher rollers, mining buckets, and elevator components.
Metallurgical equipment: Rolling mill frames and blast furnace hoppers.
Hydropower equipment: Turbine runners, guide vanes, and main shafts, among other components requiring corrosion and fatigue resistance.
Railway equipment: Locomotive bogies, couplers, and brake system components.
Marine equipment: Seawater-resistant components such as marine diesel engine crankshafts, anchor chains, and rudder stocks.
Automotive equipment: Heavy-duty truck chassis parts and transmission housings.
More than 10 years of customized casting experience, stable casting process quality, professional casting engineer team, good worker training system, complete quality inspection equipment and good after-sales service. Send us the detailed drawing for quotation
Contact us today for a quote or more information.
Precisely Matching Your Project Requirements
| Carbon steel casting material grade | |||||||||||||
| No. | China | CNS | Japan | South Korea | USA | ISO | Germany | France | Russia aгост | Sweden SS | UK | ||
| GB | JIS | KS | AWS | UNS | DIN | W-Nr. | NF | BS | |||||
| 1 | ZG200-400 (ZG15) | SC410 | SC410 (SC42) | SC410 (SC42) | 415-205 (60-30) | J03000 | 200-400 | GS-38 | 1.0416 | – | 15л | 1306 | – |
| 2 | ZG230-450 (ZG25) | SC450 | SC450 (SC46) | SC450 (SC46) | 450-240 965-35) | J03101 | 230-450 | GS-45 | 1.0446 | GE230 | 25л | 1305 | A1 |
| 3 | ZG270-500 (ZG35) | SC480 | SC480 (SC49) | SC480 (SC49) | 485-275 (70-40) | J02501 | 270-480 | GS-52 | 1.0552 | GE280 | 35л | 1505 | A2 |
| 4 | ZG310-570 (ZG45) | SCC5 | SCC5 | SCC5 | (80-40) | J05002 | – | GS-60 | 1.0558 | GE320 | 45л | 1606 | – |
| 5 | ZG340-640 (ZG55) | – | – | – | – | J05000 | 340-550 | – | – | GE370 | – | – | A5 |
Advanced Equipment for High-Quality Steel Casting Manufacturing
Cast Star Horizontal Molding Line/Microcrystalline automatic pouring machine/New Donger Molding Machine/Sand mixing system and sand separator/Coremaking machine/40T automatic sand treatment line/1T intermediate frequency furnace 3 sets
We have 1set 1005 horizontal machining center, 6sets 630 horizontal machining centers, 1set 500 horizontal machining center, 7sets 850 vertical machining centers, 3sets 1160 vertical machining centers, and 1set CMM Main Machining: robot joints, reducer boxes, aluminum alloy high-voltage housings, textile machinery accessories, etc.
2 spectrometers, 2universal material testing machines, C-S analyzer, Si-Mn-P high-speed analyzer, 2 metallographic microscopes, 2 Brinell hardness meters, impact testing machines, molding sand permeability detectors, and an independent physical and chemical testing
Casting Inspection
1.Visual Inspections
2.Dimensional Inspections
3.Chemical Inspections
4.Mechanical Properties Inspections
We have materials R&D center,In line with the CAD and UG three-dimensional mold creation capabilities equipped with independent R&D
1. Design Stage Control
Rational structural design: Avoid sudden changes in wall thickness and sharp corners, and use rounded corner transitions to reduce stress concentration.
Processability Review: Ensure that the casting design meets casting process requirements (e.g., draft angle, shrinkage allowance).
2. Raw Material Control
Metal materials: Strictly control chemical composition (e.g., carbon equivalent, impurities) to ensure the purity of the smelted material.
Smelting Process: Control the melting temperature and deoxidize and degas (e.g., use argon refining) to avoid inclusions and residual gases.
3. Process Control
Mold/Mold Shell Quality: Ensure mold accuracy and surface finish, and uniform sand compaction.
Gating System Design: Properly arrange the gate, riser, and chiller to ensure sequential or simultaneous solidification.
Gating Temperature (too high can cause sand sticking, too low can cause cold shutoff).
Gating Speed (avoid turbulence that causes air entrainment).
Cooling Rate (control grain size and microstructure uniformity). Special Processes: Advanced processes such as low-pressure casting and lost foam casting are used for complex parts.
4. Production Process Monitoring Real-time Testing: Thermocouples are used to monitor the melting temperature, and spectrometers are used for rapid composition analysis.
Environmental Control: Humidity and temperature affect the properties of the molding sand and must be maintained stable.
Operational Specifications: Standardized operations are implemented (e.g., cleaning loose sand before assembly and ensuring proper heat preservation after pouring).
5. Inspection and Defect Analysis
X-ray/ultrasonic testing for internal defects (porosity, shrinkage).
Penetrant testing for surface cracks.
Destructive Testing: Mechanical testing (tensile strength, hardness) and metallographic analysis are performed on random samples.
Defect Traceability: A defect classification database (e.g., slag inclusions, pinholes) is established to analyze the root causes and provide feedback for improvements.
Our Commitment To Quality, Safety & Sustainability
We can customize various sizes of low carbon steel and alloy steel castings according to drawings. We have stable and reliable quality, reasonable price, fast delivery time, no minimum order quantity requirement, and provide machining services for steel castings.
High-quality steel casting parts with precise dimensions and good surface,long service times
We no requirem MOQ and for new project, the lead time with mold no more than 40 days
Competitve casting parts in china, the more oreder, the better price.
we promise if the steel casting parts defects more than 5%, we will send you new one free of charge
Gray iron castings are manufactured very easily and have good machinability.They are typically used in the following applications where strength is important, but not the main required property:
We make the parts from 0.5kgs to 10000kgs, special size is available
For samples, it need about 30days(model develop time 15-20 days, samples production time 10 days)
Bulk order after mold finished, it need about 20 days
Our yearly production can reach to 4000 tons
Yes, please offer detailed 2D drawing
We promise the QC pass rate 95%, if lower than this, we will send you new part free of charge
Gray cast iron is a broad term used for a number of cast irons whose microstructures are characterized by the presence of flake graphite in the ferrous matrix. Such castings often contain 2.5% to 4% carbon, 1% to 3% silicon, and some additions of manganese ranging from 0.1% to 1.2%.
Normally, grey iron will be cheaper than ductile iron, and ductile iron will be cheaper than malleable iron. As for the same type of cast iron, the low and middle grades will have the same prices, but high grades will cause higher production costs.
| Physical Properties | Metric | English |
|---|---|---|
| Hardness, Rockwell C | 20 | 20 |
| Hardness, Vickers | 246 | 246 |
| Tensile Strength, Ultimate | >= 276 MPa | >= 40000 psi |
| Ultimate Compressive Strength | >= 1034 MPa | >= 150000 psi |
The biggest disadvantage of gray cast iron is its low tensile strength. This results from the graphite flakes within the material – which also give it many of its benefits.
Class 25,30,35,40 tensile and heat resistant irons. Gray Iron has a dense gray structure and offers excellent machinability. Grades 25, 30, 35 and 40 can fill specific requirements for hardness and wear, and heat treatments can yield even higher mechanical properties.
The defect appears preferably on horizontal or convex surfaces and at the surface of parts of reduced thickness having solidified at high cooling rates. In grey cast irons with high carbon contents, the defect can be formed in thick sections in which C-type graphite (hypoeutectic alloys) is commonly present.
Like gray cast iron, white cast iron features many small fractures. The difference is that white cast iron features cementite below its surface, whereas gray cast iron features graphite below its surface. The graphite creates the appearance of a gray color, while the cementite creates the appearance of a white color.
The more carbon present in a material, the more brittle it is. Grey cast iron is further impacted by its graphical microstructure. It has tiny cracks and graphite flakes inherent within the material and these also contribute to its brittleness.
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