Ovako C55 SBC55 Steel Capillary

Ovako C55 SBC55 Steel Capillary, Hot forging Product Information -:- For detailed product information, please contact sales. -: Ovako C55 SBC55 Steel Capillary, Hot forging Synonyms -:- For detailed product information, please contact sales. -:

Ovako C55 SBC55 Steel, Hot forging Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Ovako C55 SBC55 Steel, Hot Forging Quality** **Ovako C55 SBC55** is a specialized **high-carbon, boron-treated steel** designed and produced by Ovako specifically for **hot forging applications** where superior hardenability is required. The "C55" denotes the base carbon content, while the "SBC" prefix and "55" suffix indicate it is part of Ovako's family of **Special Boron Carburizing/Through-Hardening steels** engineered for demanding components. This grade leverages a controlled boron addition to significantly enhance hardenability without requiring high levels of expensive alloying elements like chromium, nickel, or molybdenum. This makes SBC55 a cost-effective solution for producing large or complex forged parts that require uniform, high strength and hardness throughout their cross-section after heat treatment. --- ## **1. Chemical Composition (Ovako SBC55 Specification)** The composition is based on a C55 carbon level with the critical addition of boron and controlled residuals to optimize its effect. | Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Boron (B) | Phosphorus (P) | Sulfur (S) | **Boron Protection** | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Range** | 0.52 - 0.58 | 0.15 - 0.40 | 0.70 - 1.00 | **0.0008 - 0.0035** | **≤ 0.025** | **≤ 0.025** | Ti or Al present | | **Key Role** | Base strength & hardness. | Deoxidizer. | Base hardenability. | **Potent hardenability enhancer.** | Low for toughness. | Low for isotropy. | Ti/N ties up N, protects B. | **Critical Features of the Composition for Hot Forging:** * **Boron Addition (The Core Feature):** A minute amount of Boron (typically 8-35 ppm) is a **powerful hardenability multiplier**. It segregates to austenite grain boundaries during forging and subsequent heating, dramatically delaying the formation of soft transformation products (like ferrite/pearlite) upon quenching. This allows for deep and uniform hardening. * **High Carbon Content:** Provides the foundation for achieving high strength and wear resistance after heat treatment. * **"Boron-Protected" Steel:** To ensure boron remains effective, the steel is "protected" with a strong nitride-forming element like **Titanium (Ti)** or **Aluminum (Al)**. These elements preferentially combine with nitrogen, preventing it from deactivating the boron by forming boron nitrides. * **Forging-Optimized Purity:** Controlled low levels of phosphorus and sulfur ensure good hot ductility during forging and improve the toughness of the final forged and heat-treated component. --- ## **2. Physical & Mechanical Properties** Properties are defined for the **as-supplied forging stock** and the **final forged, quenched & tempered component**. **A. Supplied Condition (Hot-rolled bar, for forging):** * **Condition:** Typically supplied in a hot-rolled, annealed, or soft condition. * **Hardness:** ~ 180 - 220 HB. * **Microstructure:** Ferrite-pearlite, suitable for hot deformation. * **Hot Workability:** Good, with predictable flow stress at forging temperatures. **B. After Hot Forging & Controlled Cooling:** * The forged grain structure is refined. Properties depend on cooling rate. **C. After Hot Forging, Quenching & Tempering (Final State - Key Benefit):** * **Hardenability:** **Exceptional for its alloy content.** Can achieve a fully martensitic structure (or high hardness) in **significantly larger cross-sections** than a standard C55 steel without boron. * **Tensile Strength (Rm):** **1600 - 2000 MPa** (adjustable via tempering). * **Yield Strength (Rp0.2):** **1300 - 1700 MPa**. * **Hardness:** **50 - 60 HRC** (typical range after tempering for wear applications). * **Core Uniformity:** Provides highly uniform strength and hardness from surface to core in large forgings, eliminating a soft core. * **Toughness:** Moderate. The high carbon content inherently limits impact toughness, but the low P/S levels and forged grain refinement help maximize it. --- ## **3. Product Applications** Ovako C55 SBC55 is engineered for **large, high-strength forged components** that require through-hardening, particularly where section size would make using a standard C55 or low-alloy steel impractical or uneconomical. * **Heavy-Duty Automotive & Truck:** **Large crankshafts, king pins, axle shafts, and transmission gears.** * **Off-Highway & Agricultural Machinery:** **Final drive gears, heavy-duty track links, pivot shafts, and differential components.** * **Industrial Gearing:** **Large-diameter gear blanks** for mining, wind power, and heavy processing equipment. * **Oil & Gas Equipment:** **Large forged fittings, valve components, and drill string accessories.** * **General Heavy Forging:** Any large forging requiring a high and uniform hardness after heat treatment. --- ## **4. International & Equivalent Standards** SBC55 is a proprietary boron steel. Its equivalents are found in systems that specify boron-hardened steels. | Standard System | Equivalent / Comparable Grade | **Relationship / Note** | | :--- | :--- | :--- | | **Ovako Specification** | **C55 SBC55** | The exact proprietary grade. | | **EN 10083-3 (Boron Steels)** | **1.5536 (55B2)** | The closest European standard equivalent. The "B" denotes boron. | | **AISI/SAE** | **10Bxx Series (e.g., 10B55)** | The direct U.S. system for boron steels. **10B55** is a very close match. | | **JIS** | **S55C-B** | A common mill specification in Japan for boron-treated S55C, not a formal JIS grade. | | **GB (China)** | **55B** | Chinese boron steel equivalent. | | **Comparison** | Similar hardenability to lower-carbon alloy steels like **4140/42CrMo4**, but with higher carbon for ultimate hardness. | Provides a cost/performance alternative. | **Key Distinction:** **SBC55 is not a standard C55 steel.** It is a **boron-hardened variant** specifically for applications demanding deep hardenability. Ordering standard "C55" or "S55C" will not provide this critical characteristic. The "SBC" prefix must be specified. --- ## **5. Key Advantages & Considerations** **Advantages:** * **Exceptional Hardenability at Low Cost:** Achieves hardenability comparable to more expensive low-alloy steels (e.g., 4140) through efficient boron microalloying. * **Ideal for Large Forgings:** Enables the production of large, through-hardened components with uniform properties, eliminating weak spots. * **Good Hot Forgeability:** The composition is designed for predictable deformation at high temperatures. * **High Strength-to-Weight Potential:** Allows for weight-saving designs by enabling the use of smaller cross-sections to achieve required strength, or by hardening larger sections effectively. **Considerations:** * **Boron Sensitivity:** The steel's behavior is highly dependent on precise boron and nitrogen control. Improper melting or processing can render the boron ineffective or cause brittleness. * **Temper Embrittlement Risk:** Boron steels can be susceptible to temper embrittlement if tempered in a critical temperature range (~350-575°C). Tempering temperatures must be carefully selected and controlled. * **Limited Weldability:** Welding is challenging and generally not recommended. The heat-affected zone (HAZ) can have unpredictable hardenability and high cracking susceptibility. * **Lower Toughness than Alloy Steels:** While hardenable, its toughness at a given hardness is generally lower than that of a quenched & tempered alloy steel like 4140 due to the higher carbon content. --- **Disclaimer:** The successful use of Ovako C55 SBC55 hinges on **controlled forging practice and precise, well-understood heat treatment.** The powerful effect of boron requires expertise. **It is imperative to consult Ovako's detailed technical data sheets for SBC55 and collaborate closely with their metallurgical experts** to define optimal forging temperatures, quenching media, and tempering cycles for the specific component geometry. This material is a specialist solution for specific, well-defined engineering challenges. -:- For detailed product information, please contact sales. -: Ovako C55 SBC55 Steel, Hot forging Specification Dimensions Size： Diameter 20-1000 mm Length <5090 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. -: Ovako C55 SBC55 Steel, Hot forging Properties -:- For detailed product information, please contact sales. -:

Applications of Ovako C55 SBC55 Steel Capillary, Hot forging -:- For detailed product information, please contact sales. -: Chemical Identifiers Ovako C55 SBC55 Steel Capillary, Hot forging -:- For detailed product information, please contact sales. -:

Packing of Ovako C55 SBC55 Steel Capillary, Hot forging -:- 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 Capillary 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 1561 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