Ovako C45 SB1672 Steel

Ovako C45 SB1672 Steel Product Information -:- For detailed product information, please contact sales. -: Ovako C45 SB1672 Steel Synonyms -:- For detailed product information, please contact sales. -:

Ovako C45 SB1672 Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Ovako C45 SB1672 Steel Bar** **Ovako C45 SB1672** is a premium **hardenability-guaranteed engineering steel bar** produced by Ovako, representing a specialized category within their high-quality steel portfolio. The "SB1672" designation refers to Ovako's internal specification for a **medium-carbon, boron-treated steel** based on the C45 grade, engineered to deliver enhanced and consistent through-hardening characteristics for demanding applications. The inclusion of boron (B) in trace amounts is the defining feature of this steel. Boron is a potent, cost-effective hardenability enhancer that significantly increases the depth of hardening achievable during quenching and tempering. This makes SB1672 ideal for components with larger cross-sections or complex geometries that require uniform, high-strength properties throughout, while maintaining the excellent machinability and surface quality associated with Ovako's production standards. --- ## **1. Chemical Composition (Per Ovako SB1672 / Boron Steel Standard)** The chemistry is based on the standard C45E grade with the critical addition of boron and tighter controls on residual elements to optimize its effect. | Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | **Boron (B)** | Chromium (Cr)* | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Content** | 0.42 - 0.50 | 0.15 - 0.40 | 0.50 - 0.80 | ≤ 0.025 | 0.015 - 0.035 | **0.0005 - 0.0030** | ≤ 0.40 | | **Key Feature** | Base for strength. | Standard. | Controlled for baseline hardenability. | **Very Low** for toughness. | Controlled for machinability. | **Core Hardenability Enhancer** | Controlled residual. | **Critical Features of the Composition:** * **Boron Addition (The Key Differentiator):** Even in minute quantities (typically 5-30 ppm), boron dramatically increases hardenability by segregating to austenite grain boundaries, delaying the formation of soft transformation products (like ferrite and pearlite) during quenching. This allows for the formation of harder microstructures (martensite/bainite) in thicker sections. * **Low Carbon Equivalent Relative to Hardenability:** Compared to achieving similar hardenability with traditional alloys like chromium or molybdenum, the carbon and overall alloy content remain lower. This can improve **weldability and machinability** compared to alloy steels of equivalent hardenability. * **High Purity:** Maintains Ovako's characteristic low phosphorus levels to ensure good toughness and fatigue resistance. * **Titanium/Nitrogen Control:** Boron's effectiveness requires protection from nitrogen. The steel is typically "boron-protected" with small additions of titanium (Ti) or aluminum (Al) to tie up nitrogen, forming stable nitrides and leaving free boron to act on hardenability. --- ## **2. Physical & Mechanical Properties** Properties are defined for the supplied (soft-annealed) condition and, most importantly, for the quenched and tempered state where boron's effect is realized. **A. Supplied Condition (Soft Annealed):** * **Hardness:** **≤ 225 HB** (Typically 180-210 HB). Optimized for machinability. * **Tensile Strength (Rm):** 650 - 800 MPa * **Yield Strength (Rp0.2):** 400 - 500 MPa * **Elongation (A):** ≥ 14% * **Machinability:** **Good.** Comparable to standard C45 in the annealed state, benefiting from controlled sulfur and fine microstructure. **B. After Quenching & Tempering (Key Benefit):** * **Hardenability:** **Significantly higher than standard C45.** Can achieve a specified hardness depth (e.g., 50% martensite) in sections **50-100% thicker** than non-boron C45 under the same quenching conditions. * **Tensile Strength (Rm):** 900 - 1200+ MPa (adjustable via tempering). * **Yield Strength (Rp0.2):** 700 - 1000+ MPa. * **Through-Section Uniformity:** Provides more consistent mechanical properties from surface to core in large-diameter bars. * **Typical Hardness Range:** HRC 30 - 45 (for structural components). --- ## **3. Product Applications** Ovako C45 SB1672 is specifically chosen for **medium-to-large cross-section components** that require high, uniform strength throughout, and where using a higher-alloy steel would be less cost-effective or detrimental to machinability. * **Large Shafts & Axles:** **Vehicle axle shafts, propeller shafts, and heavy machinery drive shafts** requiring consistent strength in thick sections. * **High-Strength Fasteners:** **Large bolts, studs, and pins** (e.g., property classes 10.9, 12.9) where through-hardening is essential for performance. * **Agricultural & Construction Equipment:** **Linkage arms, pivot pins, and gear blanks** subject to heavy loads. * **General Engineering Components:** **Hydraulic cylinder rods, press columns, and machine bases** where section size demands good hardenability. * **Components for Induction Hardening:** Also suitable, where the tough, strong core provided by boron-enhanced through-hardening supports a hard surface case. --- ## **4. International & Equivalent Standards** SB1672 is a proprietary boron-treated grade. Its equivalents are other boron-hardened steels, not standard C45. | Standard System | Equivalent Grade / Standard | **Relationship / Note** | | :--- | :--- | :--- | | **Ovako** | **SB1672 (C45 with B)** | The primary, performance-guaranteed specification. | | **EN (DIN)** | **1.1203 (C45E)** **or** **1.5532 (38B2)** | Chemically similar to C45E, but its hardenability aligns more with boron grades like 38B2/30B2. The "B" denotes boron. | | **ISO** | ISO 683-18: **Type 1.1203** | Base standard equivalent. | | **AISI/SAE** | **10Bxx Series (e.g., 10B38, 10B45)** | The direct U.S. equivalent system for boron steels. **10B45** is a close match. | | **JIS** | **S45C-B** | Japanese designation for boron-treated S45C. Not a standard JIS grade but a common mill specification. | | **GB (China)** | **45B** | Chinese boron steel equivalent. | **Crucial Distinction:** **SB1672 is not a simple C45 steel.** It is a **boron-hardened steel** that uses C45 as a base. Specifying "C45" alone will not guarantee the enhanced hardenability of SB1672. Engineers must specify the boron-treated variant or its equivalents (10Bxx, xxB) to obtain these properties. --- ## **5. Key Advantages & Considerations** **Advantages:** * **High Hardenability at Low Cost:** Provides hardenability comparable to low-alloy steels (e.g., 4140) at a lower alloying cost. * **Excellent Through-Section Properties:** Ensures uniform strength and toughness in large diameters, reducing risk of a soft core. * **Good Machinability in Annealed State:** Lower alloy content than equivalent-hardenability Cr-Mo steels can facilitate easier machining. * **Weight-Saving Potential:** Allows for the design of smaller cross-sections or the use of a lower-cost steel to achieve the same performance as a larger part in standard C45. **Considerations:** * **Boron's Brittle Effect:** If not properly controlled, boron can promote temper embrittlement and reduce toughness at certain hardness levels. Proper steelmaking and heat treatment are critical. * **Limited High-Temperature Stability:** The boron effect diminishes at very high tempering temperatures (typically >500°C). * **Weldability Caution:** While better than some alloy steels, welding requires care. The heat-affected zone (HAZ) may have altered hardenability, and pre/post-heat treatment may be necessary to avoid cracking. * **Specialized Grade:** May not be as readily available as standard C45 from all stockists. --- **Disclaimer:** This overview provides general information. Boron steels require specific metallurgical understanding for proper application. For engineering design and heat treatment specification, it is **essential to consult the official Ovako SB1672 technical datasheet** and engage with their technical service. The successful use of this steel is highly dependent on precise heat treatment cycles tailored to the component's section size. -:- For detailed product information, please contact sales. -: Ovako C45 SB1672 Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5078 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 C45 SB1672 Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Ovako C45 SB1672 Steel -:- For detailed product information, please contact sales. -: Chemical Identifiers Ovako C45 SB1672 Steel -:- For detailed product information, please contact sales. -:

Packing of Ovako C45 SB1672 Steel -:- 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 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 1549 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