United Cast Bar,Unibar 700-2 Continuously Cast Spheroidal Graphite Iron Rod/Bar

United Cast Bar Unibar 700-2 Continuously Cast Spheroidal Graphite Iron Rod Product Information -:- For detailed product information, please contact sales. -: United Cast Bar Unibar 700-2 Continuously Cast Spheroidal Graphite Iron Rod Synonyms -:- For detailed product information, please contact sales. -:

United Cast Bar Unibar 700-2 Continuously Cast Spheroidal Graphite Iron Product Information -:- For detailed product information, please contact sales. -: # **United Cast Bar Unibar 700-2 Continuously Cast Spheroidal Graphite Iron** ## **1. Product Overview** **United Cast Bar Unibar 700-2** is a premium ultra-high-strength **continuously cast ductile iron** engineered to deliver **minimum tensile strength of 700 MPa** with **minimum elongation of 2%**. This grade represents the highest standard strength level in the ductile iron family, featuring a near-completely pearlitic or martensitic matrix that provides exceptional load-bearing capacity, excellent wear resistance, and superior fatigue performance. Through United's advanced continuous casting technology combined with specialized alloying and precise thermal processing, Unibar 700-2 achieves mechanical properties approaching those of low-alloy steels while maintaining the manufacturing advantages and cost-effectiveness of cast iron. This material is specifically designed for the most demanding applications where maximum strength, hardness, and wear resistance are critical, and where ductility requirements are minimal. The continuous casting process ensures exceptional microstructural homogeneity, minimal internal defects, and excellent dimensional consistency. ## **2. Chemical Composition** Unibar 700-2 features a sophisticated alloy composition optimized for achieving ultra-high strength through matrix strengthening and controlled graphite morphology: | Element | Composition Range (%) | Metallurgical Function | |---------|---------------------|-----------------------| | **Carbon (C)** | 3.2 - 3.6 | Precisely controlled for optimal strength-to-ductility balance | | **Silicon (Si)** | 1.8 - 2.2 | Limited to minimize ferrite formation and promote pearlite/martensite | | **Manganese (Mn)** | 0.6 - 1.0 | Strong pearlite stabilizer and solid solution strengthener | | **Phosphorus (P)** | ≤ 0.030 | Strictly minimized to prevent embrittlement | | **Sulfur (S)** | ≤ 0.010 | Extremely low for optimal nodularization | | **Magnesium (Mg)** | 0.03 - 0.06 | Essential spheroidizing agent | | **Copper (Cu)** | 1.0 - 1.5 | Strong pearlite promoter and solid solution strengthener | | **Molybdenum (Mo)** | 0.3 - 0.6 | Enhances hardenability, refines microstructure, improves elevated temperature strength | | **Nickel (Ni)** | 0.8 - 1.5 | Improves hardenability, toughness, and refines matrix structure | | **Chromium (Cr)** | 0.2 - 0.4 | Enhances hardenability and wear resistance | | **Vanadium (V)** | 0.1 - 0.2 | Grain refiner and precipitation strengthener | | **Tin (Sn)** | 0.10 - 0.20 | Strong pearlite stabilizer for consistent properties | **Microstructural Characteristics:** - **Graphite Structure:** **Type I spheroidal graphite** with uniform, fine distribution - **Nodule Count:** 150-250 nodules/mm² - **Nodule Size:** ASTM Size 2-4 (very fine) - **Matrix Structure:** **Predominantly pearlitic with possible martensite** (90-100% pearlite/martensite) - **Nodularity:** >90% (typically 94-98%) - **Carbide Content:** <3% (controlled) - **Pearlite Structure:** Extremely fine lamellar spacing (0.2-0.6 μm) - **Microstructural Uniformity:** Exceptional consistency through continuous casting control ## **3. Physical & Mechanical Properties** ### **Physical Properties:** - **Density:** 7.20 - 7.30 g/cm³ - **Melting Range:** 1140 - 1180°C - **Thermal Conductivity:** 28 - 33 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:** 75 - 85 μΩ·cm - **Damping Capacity:** Moderate (approximately 1.5-2.0 × steel) ### **Mechanical Properties (Normalized or Quenched & Tempered):** - **Tensile Strength (Rm):** 700 - 850 MPa - **Yield Strength (Rp0.2):** 480 - 620 MPa - **Elongation (A):** 2 - 5% (in 5× diameter gauge length) - **Reduction of Area:** 3 - 8% - **Hardness:** 240 - 300 HB - **Modulus of Elasticity:** 168 - 175 GPa - **Shear Modulus:** 66 - 69 GPa - **Poisson's Ratio:** 0.27 - 0.29 - **Impact Toughness (Charpy V-notch at 20°C):** 5 - 10 J - **Impact Toughness (Charpy V-notch at -20°C):** 3 - 6 J - **Fatigue Strength (Rotating Bending, R=-1):** 250 - 310 MPa (10⁷ cycles) - **Compressive Strength:** 1000 - 1250 MPa - **Transverse Rupture Strength:** 900 - 1150 MPa - **Wear Resistance:** Excellent (superior to lower-strength grades) - **Contact Fatigue Strength:** Very good for rolling contact applications ### **Performance Characteristics:** - **Machinability Index:** 50 - 60% (relative to free-machining steel) - **Surface Finish Capability:** 1.0 - 3.0 μm Ra achievable - **Pressure Tightness:** Excellent - **Thermal Stability:** Good up to 300°C - **Weldability:** Poor (requires specialized procedures) - **Response to Heat Treatment:** Excellent hardenability ### **Section-Dependent Properties:** | Bar Diameter (mm) | Typical Hardness (HB) | Tensile Strength (MPa) | Elongation (%) | Pearlite/Martensite Content (%) | |-------------------|----------------------|----------------------|---------------|-------------------------------| | 25 - 50 | 260 - 300 | 750 - 850 | 3 - 5 | 95 - 100 | | 51 - 100 | 250 - 290 | 720 - 800 | 2.5 - 4 | 92 - 98 | | 101 - 200 | 240 - 280 | 700 - 780 | 2 - 3 | 90 - 95 | | 201 - 300 | 230 - 270 | 680 - 750 | 2 - 3 | 85 - 92 | ## **4. Heat Treatment Requirements** ### **Standard Processing:** 1. **Normalizing:** 880-920°C, air cool (typical supply condition) 2. **Quenching & Tempering:** For highest strength applications 3. **Stress Relieving:** 550-600°C for dimensional stability ### **Optional Treatments:** - **Austempering:** For improved toughness at high strength - **Surface Hardening:** Induction or flame hardening - **Nitriding/Carbonitriding:** For surface enhancement ## **5. Product Applications** ### **Ultra-High-Strength Automotive:** - **Performance Engine Components:** Crankshafts, camshafts for racing applications - **Heavy-Duty Transmission:** Gears, shafts for commercial vehicles - **High-Load Suspension:** Components for off-road and heavy vehicles ### **Heavy Industrial Equipment:** - **Mining Machinery:** Crusher components, excavator teeth, wear plates - **Construction Equipment:** High-wear components, track systems - **Material Handling:** Crane components, heavy-duty gears ### **Industrial Machinery:** - **High-Torque Gearboxes:** Gears, pinions, shafts - **Press Components:** Slides, guides, eccentric shafts - **Extrusion Equipment:** Screws, barrels for demanding applications ### **Energy Sector:** - **Wind Turbine Components:** Gearbox elements for multi-megawatt turbines - **Oil & Gas:** Valve components, drilling equipment parts - **Power Generation:** Turbine components, high-pressure valve bodies ### **Special Applications:** - **Defense Components:** Armored vehicle parts, weapon system components - **Railway:** Heavy-duty brake components, coupler systems - **Marine:** Propeller shafts, rudder stocks for large vessels ## **6. International Standards** ### **Material Specifications:** - **EN 1563:2018:** *Founding — Spheroidal graphite cast irons* - **EN-GJS-700-2:** Minimum tensile strength 700 MPa, minimum elongation 2% - **ISO 1083:2018:** *Spheroidal graphite cast irons* - **JS/ISO 700-2:** Equivalent international designation - **ASTM A536-84 (2020):** *Standard Specification for Ductile Iron Castings* - **Grade 120-90-02:** 120 ksi (827 MPa) tensile, 90 ksi (621 MPa) yield, 2% elongation - **DIN EN 1563:** *Gusseisen mit Kugelgraphit* - **JIS G5502:2022:** *Spheroidal graphite iron castings* - **FCD700-2:** Minimum tensile strength 700 MPa, minimum elongation 2% - **GB/T 1348-2019:** *Spheroidal graphite iron castings* - **QT700-2:** Minimum tensile strength 700 MPa, minimum elongation 2% ## **7. Comparative Advantages** ### **vs. Alloy Steel:** - **Lower density** (≈10% lighter) - **Better damping capacity** - **Superior castability for complex shapes** - **Lower machining costs typically** - **Better wear resistance in many applications** ### **vs. Lower-Strength Ductile Iron:** - **Higher strength and hardness** - **Better wear resistance** - **Superior fatigue performance** - **Higher load-bearing capacity** - **More limited ductility and toughness** ## **8. Manufacturing Considerations** ### **Machining Guidelines:** - **Tooling:** Premium carbide grades with advanced coatings - **Parameters:** Conservative speeds and feeds recommended - **Coolant:** High-pressure systems beneficial - **Finishing:** May require grinding for best surface finish ### **Quality Assurance:** - **Non-Destructive Testing:** Ultrasonic and magnetic particle inspection - **Mechanical Testing:** Full characterization for each heat - **Microstructural Analysis:** Regular validation of structure ## **9. Economic Benefits** ### **Cost Advantages:** - **Lower material cost** than equivalent-strength alloy steels - **Reduced machining time** compared to many steels - **Lower total manufacturing cost** for complex components - **Longer service life** in wear applications ### **Sustainability:** - **Lower energy consumption** in production - **Higher material utilization** in continuous casting - **100% recyclable** at end of life - **Reduced weight** for moving components ## **Conclusion** **United Cast Bar Unibar 700-2** represents the pinnacle of high-strength ductile iron technology, offering mechanical properties that compete with alloy steels while maintaining the manufacturing advantages of cast iron. With its 700 MPa minimum tensile strength and controlled 2% minimum elongation, this material is ideally suited for applications where maximum strength and wear resistance are paramount. **Key Applications Include:** - High-performance automotive and heavy vehicle components - Mining and construction equipment wear parts - Heavy industrial machinery components - Energy sector high-strength applications - Components where strength outweighs ductility requirements For manufacturers requiring ultra-high strength combined with the economic and manufacturing benefits of cast iron, Unibar 700-2 provides a technically advanced and cost-effective solution backed by United's continuous casting expertise and quality assurance systems. **Note:** Due to its limited ductility, careful design consideration is required to avoid stress concentrations and ensure successful application in demanding service conditions. -:- For detailed product information, please contact sales. -: United Cast Bar Unibar 700-2 Continuously Cast Spheroidal Graphite Iron Specification Dimensions Size： Diameter 20-1000 mm Length <6656 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 700-2 Continuously Cast Spheroidal Graphite Iron Properties -:- For detailed product information, please contact sales. -:

Applications of United Cast Bar Unibar 700-2 Continuously Cast Spheroidal Graphite Iron Rod -:- For detailed product information, please contact sales. -: Chemical Identifiers United Cast Bar Unibar 700-2 Continuously Cast Spheroidal Graphite Iron Rod -:- For detailed product information, please contact sales. -:

Packing of United Cast Bar Unibar 700-2 Continuously Cast Spheroidal Graphite Iron Rod -:- 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 Rod 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 3127 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