United Cast Bar,Unibar 500-7 Continuously Cast Spheroidal Graphite Iron Tube,Pipe

United Cast Bar Unibar 500-7 Continuously Cast Spheroidal Graphite Iron Tube Product Information -:- For detailed product information, please contact sales. -: United Cast Bar Unibar 500-7 Continuously Cast Spheroidal Graphite Iron Tube Synonyms -:- For detailed product information, please contact sales. -:

United Cast Bar Unibar 500-7 Continuously Cast Spheroidal Graphite Iron Product Information -:- For detailed product information, please contact sales. -: # **United Cast Bar Unibar 500-7 Continuously Cast Spheroidal Graphite Iron** ## **1. Product Overview** **United Cast Bar Unibar 500-7** is a high-strength **continuously cast ductile iron** that delivers an optimal balance of **500 MPa minimum tensile strength** and **7% minimum elongation**. This material represents a medium-to-high strength grade within the ductile iron family, specifically engineered for applications requiring enhanced load-bearing capacity while maintaining adequate toughness. Through United's advanced vertical continuous casting technology, Unibar 500-7 achieves a predominantly pearlitic matrix with controlled ferrite content, providing superior strength, wear resistance, and dimensional stability compared to lower-strength ductile iron grades. The continuous casting process ensures exceptional microstructural homogeneity, minimal internal defects, and excellent consistency throughout the bar length. This grade is particularly suitable for components subjected to significant mechanical stresses, where strength, wear resistance, and reliable performance under load are critical design considerations. ## **2. Chemical Composition** The chemical composition of Unibar 500-7 is precisely engineered to achieve a pearlitic-ferritic matrix with optimal graphite spheroidization: | Element | Composition Range (%) | Metallurgical Function | |---------|---------------------|-----------------------| | **Carbon (C)** | 3.4 - 3.8 | Provides carbon for graphite formation; balanced for strength and castability | | **Silicon (Si)** | 2.2 - 2.6 | Graphitizing agent; controlled to achieve target pearlite content | | **Manganese (Mn)** | 0.3 - 0.6 | Pearlite stabilizer; contributes to strength through solid solution strengthening | | **Phosphorus (P)** | ≤ 0.04 | Strictly limited to maintain ductility and impact resistance | | **Sulfur (S)** | ≤ 0.015 | Minimized for effective magnesium treatment and graphite spheroidization | | **Magnesium (Mg)** | 0.03 - 0.06 | Essential spheroidizing agent for graphite nodule formation | | **Copper (Cu)** | 0.4 - 0.8 | Strong pearlite promoter; enhances strength and refines microstructure | | **Tin (Sn)** | 0.05 - 0.10 | Supplementary pearlite stabilizer for consistent as-cast properties | | **Molybdenum (Mo)** | 0.1 - 0.3 | Optional addition for improved hardenability and elevated temperature strength | | **Nickel (Ni)** | 0.2 - 0.5 | Optional addition for improved toughness and hardenability in heavy sections | | **Chromium (Cr)** | ≤ 0.10 | Minimized to prevent carbide formation | **Microstructural Characteristics:** - **Graphite Structure:** **Type I spheroidal graphite** with uniform distribution - **Nodule Count:** 100-180 nodules/mm² - **Nodule Size:** ASTM Size 4-5 - **Matrix Structure:** **Predominantly pearlitic** (60-85% pearlite, 15-40% ferrite) - **Nodularity:** >90% (typically 92-96%) - **Carbide Content:** <2% - **Pearlite Structure:** Fine lamellar spacing (0.5-1.0 μm) - **Microstructural Uniformity:** Excellent consistency due to controlled cooling in continuous casting ## **3. Physical & Mechanical Properties** ### **Physical Properties:** - **Density:** 7.10 - 7.20 g/cm³ - **Melting Range:** 1140 - 1180°C - **Thermal Conductivity:** 33 - 38 W/m·K (at 20°C) - **Specific Heat Capacity:** 0.46 - 0.50 kJ/kg·K - **Coefficient of Thermal Expansion:** 11.5 - 12.5 × 10⁻⁶/°C (20-200°C) - **Electrical Resistivity:** 65 - 75 μΩ·cm - **Damping Capacity:** Moderate (approximately 2-3 × steel) - **Magnetic Properties:** Ferromagnetic; good magnetic permeability ### **Mechanical Properties:** - **Tensile Strength (Rm):** 500 - 650 MPa - **Yield Strength (Rp0.2):** 320 - 420 MPa - **Elongation (A):** 7 - 15% (in 5× diameter gauge length) - **Reduction of Area:** 10 - 20% - **Hardness:** 170 - 230 HB - **Modulus of Elasticity:** 168 - 172 GPa - **Shear Modulus:** 66 - 69 GPa - **Poisson's Ratio:** 0.27 - 0.29 - **Impact Toughness (Charpy V-notch at 20°C):** 8 - 14 J - **Impact Toughness (Charpy V-notch at -20°C):** 5 - 10 J - **Fatigue Strength (Rotating Bending, R=-1):** 210 - 260 MPa (10⁷ cycles) - **Compressive Strength:** 850 - 1050 MPa - **Transverse Rupture Strength:** 700 - 900 MPa - **Wear Resistance:** Good to very good (better than lower-strength ductile iron grades) ### **Performance Characteristics:** - **Machinability Index:** 60 - 70% (relative to free-machining steel) - **Surface Finish Capability:** 0.8 - 2.0 μm Ra achievable - **Pressure Tightness:** Excellent - **Thermal Stability:** Good resistance to thermal growth - **Weldability:** Fair to good with proper procedures - **Response to Heat Treatment:** Good hardenability for surface hardening ### **Section-Dependent Properties:** | Bar Diameter (mm) | Typical Hardness (HB) | Tensile Strength (MPa) | Elongation (%) | Pearlite Content (%) | |-------------------|----------------------|----------------------|---------------|---------------------| | 25 - 50 | 200 - 230 | 550 - 650 | 10 - 15 | 75 - 85 | | 51 - 100 | 190 - 220 | 520 - 600 | 8 - 12 | 70 - 80 | | 101 - 200 | 180 - 210 | 500 - 580 | 7 - 10 | 65 - 75 | | 201 - 300 | 170 - 200 | 480 - 550 | 7 - 9 | 60 - 70 | ## **4. Product Applications** ### **High-Strength Automotive Components:** - **Diesel Engine Components:** Crankshafts, camshafts, connecting rods (for certain designs) - **Transmission Components:** Gears, shafts, synchronizer hubs - **Steering Components:** Steering knuckles, pitman arms, idler arms - **Suspension Components:** Control arms, brackets, mounting components ### **Heavy Machinery & Equipment:** - **Construction Equipment:** Excavator and bulldozer components, track links, rollers - **Mining Equipment:** Crusher components, conveyor system parts, wear plates - **Agricultural Machinery:** Tractor components, implement parts, gearbox components - **Material Handling:** Crane components, hoist drums, sheave wheels ### **Industrial Machinery:** - **Gearbox Components:** Gears, pinions, shafts for industrial reducers - **Pump Components:** High-pressure pump shafts, impellers, wear rings - **Compressor Parts:** Crankshafts, connecting rods, valve plates - **Press Components:** Slides, guides, eccentric shafts ### **Energy & Power Generation:** - **Wind Turbine Components:** Gearbox components, shafts, bearing housings - **Turbine Components:** Non-rotating turbine parts, valve bodies - **Hydropower Equipment:** Gate components, turbine runner hubs - **Power Transmission:** Couplings, flange connections ### **Railway & Transportation:** - **Railway Components:** Wheelsets (for certain applications), brake components - **Commercial Vehicles:** Axle components, suspension parts, brake drums - **Marine Applications:** Propeller shafts, stern tubes, rudder stocks ## **5. International & Relevant Standards** ### **Material Specifications:** - **EN 1563:2018:** *Founding — Spheroidal graphite cast irons* - **EN-GJS-500-7:** Minimum tensile strength 500 MPa, minimum elongation 7% - **ISO 1083:2018:** *Spheroidal graphite cast irons* - **JS/ISO 500-7:** Equivalent international designation - **ASTM A536-84 (2020):** *Standard Specification for Ductile Iron Castings* - **Grade 80-55-06:** 80 ksi (552 MPa) tensile, 55 ksi (379 MPa) yield, 6% elongation - **Grade 100-70-03:** 100 ksi (689 MPa) tensile, 70 ksi (483 MPa) yield, 3% elongation - Unibar 500-7 properties typically fall between these ASTM grades - **DIN EN 1563:** *Gusseisen mit Kugelgraphit* - **GGG-50** (historical designation) - **JIS G5502:2022:** *Spheroidal graphite iron castings* - **FCD500-7:** Minimum tensile strength 500 MPa, minimum elongation 7% - **GB/T 1348-2019:** *Spheroidal graphite iron castings* (Chinese Standard) - **QT500-7:** Minimum tensile strength 500 MPa, minimum elongation 7% ### **Continuous Casting Standards:** - **DIN EN 16079:2011:** *Continuous cast iron bars* - **ISO 16112:2017:** *Compacted graphite cast irons* (reference) - **United Cast Bar Internal Specifications:** - UCB-QS-500-7: Premium ductile iron specification - UCB-CC-003: Continuous casting process standard ### **Testing & Certification Standards:** - **ASTM A247:** *Evaluating the Microstructure of Graphite in Iron Castings* - **ISO 945-1:** *Microstructure of cast irons — Part 1: Graphite classification* - **ASTM E8/E8M:** *Tension Testing of Metallic Materials* - **ASTM E10:** *Brinell Hardness of Metallic Materials* - **EN 10204:** *Metallic products — Types of inspection documents* - Type 3.1 certificate standard; Type 3.2 available - **ISO 6892-1:** *Metallic materials — Tensile testing* ## **6. Manufacturing & Processing** ### **Continuous Casting Advantages:** 1. **Directional Solidification:** Controlled cooling for optimal microstructure 2. **Reduced Internal Defects:** Minimal shrinkage porosity and inclusions 3. **Consistent Properties:** Uniform mechanical properties throughout bar length 4. **Material Efficiency:** High yield with minimal waste 5. **Surface Quality:** Good as-cast surface (typically 6.3-12.5 μm Ra) ### **Heat Treatment Options:** - **Normalizing:** 870-900°C for refined pearlite structure - **Stress Relieving:** 550-580°C for dimensional stability - **Surface Hardening:** Induction or flame hardening for wear surfaces - **Quenching & Tempering:** For applications requiring higher hardness ### **Available Forms & Specifications:** - **Solid Bars:** 30mm to 400mm diameter - **Hollow Bars (Tubes):** 50mm to 300mm OD - **Standard Lengths:** 3-6 meters; custom lengths available - **Tolerances:** Diameter ±0.3% to ±0.8% - **Surface Condition:** As-cast, rough turned, or precision turned - **Straightness:** Within 1.0mm/meter ## **7. Machining & Fabrication Guidelines** ### **Recommended Cutting Parameters:** | Operation | Speed (m/min) | Feed (mm/rev) | Depth of Cut (mm) | Tool Material | |-----------|--------------|---------------|-------------------|--------------| | Turning | 80 - 140 | 0.15 - 0.30 | 1.5 - 3.5 | C4-C7 Carbide | | Drilling | 18 - 28 | 0.10 - 0.20 | - | Carbide-tipped | | Milling | 60 - 100 | 0.10 - 0.22 | 1.0 - 2.5 | Carbide | | Tapping | 5 - 10 | - | - | HSS-E or Carbide | | Boring | 70 - 120 | 0.06 - 0.18 | 1.0 - 2.5 | Carbide | | Threading | 30 - 70 | - | - | Carbide inserts | ### **Tooling Recommendations:** - **Insert Grades:** C4-C7 carbide with PVD coatings - **Tool Geometry:** Positive to neutral rake angles - **Coatings:** TiN, TiCN, or AlCrN for improved tool life - **Coolant:** Water-soluble oils at 8-12% concentration - **Chip Control:** Use chipbreakers for optimal chip formation ### **Special Machining Considerations:** 1. **Harder Matrix:** Requires appropriate tool grades and parameters 2. **Surface Finish:** Good finish achievable with proper techniques 3. **Thread Quality:** Sharp tools and proper alignment important 4. **Thermal Management:** Monitor tool temperature to prevent work hardening ### **Fabrication Methods:** - **Welding:** Possible with proper pre-heat and post-heat treatments - **Machining:** Good overall machinability with proper tools - **Joining:** Excellent for mechanical fastening - **Surface Treatment:** Responds well to various coatings ## **8. Quality Assurance** ### **Quality Control Protocol:** 1. **Chemical Analysis:** Spectroscopic analysis for each melt 2. **Microstructural Evaluation:** Regular checks of nodularity and matrix 3. **Mechanical Testing:** Tensile tests from each production lot 4. **Hardness Testing:** Systematic hardness mapping 5. **Non-Destructive Testing:** Ultrasonic testing for larger diameters 6. **Dimensional Inspection:** Complete geometric verification ### **Certification:** - **Material Certificates:** EN 10204 3.1 provided - **Traceability:** Full batch traceability maintained - **Test Reports:** Comprehensive mechanical test data - **Process Records:** Complete casting parameter documentation ## **9. Comparative Analysis** ### **vs. Lower Strength Ductile Iron (400-15):** | Parameter | Unibar 500-7 | Unibar 400-15 | Advantage | |-----------|-------------|--------------|-----------| | **Tensile Strength** | 500-650 MPa | 400-500 MPa | Higher strength | | **Yield Strength** | 320-420 MPa | 250-320 MPa | Better load-bearing | | **Elongation** | 7-15% | 15-25% | Lower ductility | | **Hardness** | 170-230 HB | 150-200 HB | Harder, better wear resistance | | **Fatigue Strength** | 210-260 MPa | 180-220 MPa | Better fatigue performance | | **Wear Resistance** | Very Good | Good | Superior for wear applications | ### **vs. Steel Alternatives:** | Material | Tensile (MPa) | Elongation (%) | Density (g/cm³) | Damping | Cost Index | |----------|---------------|---------------|----------------|---------|------------| | **Unibar 500-7** | 500-650 | 7-15 | 7.1-7.2 | Good | 1.0 | | **Steel 1045** | 585-700 | 12-20 | 7.85 | Poor | 1.1-1.3 | | **Steel 4140** | 655-850 | 13-25 | 7.85 | Poor | 1.5-2.0 | | **Ductile Iron 700-2** | 700-900 | 2-4 | 7.1-7.2 | Good | 1.2-1.4 | ## **10. Economic & Sustainability Benefits** ### **Cost Advantages:** 1. **Material Cost:** Competitive with medium-carbon steel 2. **Machining Cost:** Lower than many steel alternatives 3. **Tool Life:** Reasonable tool life with proper parameters 4. **Production Efficiency:** Good machinability and consistency 5. **Total Cost:** Often 15-30% lower than equivalent steel components ### **Sustainability Benefits:** 1. **Energy Efficiency:** Lower melting temperature than steel 2. **Material Efficiency:** High yield in continuous casting 3. **Recyclability:** 100% recyclable 4. **Waste Reduction:** Minimal machining waste 5. **Long Service Life:** Good wear resistance extends component life ## **11. Technical Support & Services** ### **United Cast Bar Technical Support:** 1. **Material Selection:** Assistance for optimal grade selection 2. **Design Support:** Engineering guidance for component design 3. **Process Optimization:** Machining parameter recommendations 4. **Troubleshooting:** Technical assistance for production issues 5. **Training Programs:** Workshops on ductile iron applications ### **Value-Added Services:** - **Pre-Machining:** Rough machining to customer specifications - **Heat Treatment:** Various thermal processing options - **Cutting Services:** Precision cut-to-length - **Quality Documentation:** Comprehensive test reports - **Supply Chain Integration:** Inventory management solutions ## **Conclusion** **United Cast Bar Unibar 500-7** represents an excellent balance between strength and ductility in the ductile iron family. Its 500 MPa minimum tensile strength combined with 7% minimum elongation makes it suitable for a wide range of demanding applications where both load-bearing capacity and some degree of toughness are required. **Key Advantages:** - High strength with adequate ductility - Good wear resistance due to pearlitic matrix - Excellent consistency and dimensional accuracy - Good machinability with proper tooling - Cost-effective alternative to many steel components - Meets international standards (EN-GJS-500-7, ASTM equivalent) **Recommended Applications:** - Automotive components requiring strength and wear resistance - Heavy machinery and equipment components - Industrial gear and power transmission parts - Components subjected to significant mechanical stresses - Applications where strength is prioritized over maximum ductility For manufacturers seeking a reliable, high-performance material with guaranteed properties and excellent manufacturing characteristics, Unibar 500-7 provides an optimal solution backed by United's expertise in continuous casting technology. -:- For detailed product information, please contact sales. -: United Cast Bar Unibar 500-7 Continuously Cast Spheroidal Graphite Iron Specification Dimensions Size： Diameter 20-1000 mm Length <6654 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: United Cast Bar Unibar 500-7 Continuously Cast Spheroidal Graphite Iron Properties -:- For detailed product information, please contact sales. -:

Applications of United Cast Bar Unibar 500-7 Continuously Cast Spheroidal Graphite Iron Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers United Cast Bar Unibar 500-7 Continuously Cast Spheroidal Graphite Iron Tube -:- For detailed product information, please contact sales. -:

Packing of United Cast Bar Unibar 500-7 Continuously Cast Spheroidal Graphite Iron Tube -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Tube drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3125 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition