Ovako C55R EN 10083-2:2006 (ref) Steel Foil/Strip

Ovako C55R EN 10083-2:2006 (ref) Steel Foil, Hardening Product Information -:- For detailed product information, please contact sales. -: Ovako C55R EN 10083-2:2006 (ref) Steel Foil, Hardening Synonyms -:- For detailed product information, please contact sales. -:

Ovako C55R EN 10083-2:2006 (ref) Steel, Hardening Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: Ovako C55R EN 10083-2:2006 (ref) Steel, for Hardening** **Ovako C55R EN 10083-2:2006 (ref)** is a standardized **high-carbon, non-alloy quality steel** produced by Ovako, specifically designated under the EN standard for applications requiring controlled **hardenability**. The "R" suffix is a **mandatory designation** within EN 10083-2, indicating that this steel is supplied with a **guaranteed hardenability range** (as determined by a Jominy end-quench test). This makes it distinct from standard grades where hardenability is typical but not guaranteed. This material is engineered for components where **predictable and consistent depth of hardening is critical** to ensure uniform mechanical properties, especially in larger cross-sections or in high-volume production where heat treatment results must be repeatable batch after batch. It is typically supplied in a soft condition for machining before undergoing final quenching and tempering. --- ## **1. Chemical Composition (Per EN 10083-2:2006 - Grade 1.1203 with Hardenability Requirement)** The chemistry adheres to the standard C55 limits but is produced with tighter controls to meet the specific hardenability band specified by the "R" designation. The actual chemical ranges are identical to C55E, but the *guarantee* of hardenability is the key difference. | Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | **The "R" Designation Meaning** | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **EN 10083-2 Limits for C55R** | 0.52 - 0.60 | ≤ 0.40 | 0.60 - 0.90 | ≤ 0.035 | ≤ 0.035 | **Steel supplied with a specified hardenability range.** | | **Ovako's Guarantee** | Tightly controlled to hit the mid-range of a specific hardenability band. | | | Typically supplied at lower levels for toughness. | | **A certified Jominy hardenability curve is provided.** | **Critical Features of the "R" (Hardenability) Designation:** * **Guaranteed Hardenability Band:** The manufacturer (Ovako) guarantees that the steel's hardenability, as measured by the Jominy test, falls within a specified range (e.g., band HL, HM, HH per EN 10083-2 or a customer-specific band). This is verified and reported on the material certificate. * **Chemistry as a Means, Not an End:** While the composition fits within C55 limits, the precise aim is to achieve the *hardenability target*. This often involves tighter control of manganese and chromium residuals to ensure consistency. * **Purpose:** Eliminates the risk of under- or over-hardening due to material variability. It allows the heat treater and designer to predict case depth and core hardness accurately for a given quenching process and part geometry. --- ## **2. Physical & Mechanical Properties** Properties are defined for the **supplied soft condition** and the **final hardened state**, with the key benefit being the predictability of the latter due to the hardenability guarantee. **A. Supplied Condition (Typically +A or +S for Machining):** * **Hardness:** **≤ 212 HB** (Annealed/softened condition). * **Machinability:** **Fair to Good** in the soft-annealed state, allowing for precision machining. **B. After Quenching & Tempering (The Guaranteed Outcome):** * **Hardenability:** Certified Jominy curve ensures a specified hardness at given distances from the quenched end (e.g., J10=HRC 45-52). * **Achievable Hardness:** **55 - 62 HRC** (after tempering, dependent on process). * **Core Uniformity:** For a given diameter and quench severity, the depth to a specific hardness (e.g., 50 HRC) will be consistent and predictable. * **Final Mechanical Properties (Example for a fully hardened & tempered section):** * Tensile Strength (Rm): 1800 - 2200 MPa * Yield Strength (Rp0.2): 1500 - 1800 MPa * Impact Toughness: Low (characteristic of high-carbon steel). --- ## **3. Product Applications** Ovako C55R is specified for **critical, high-stress components** where consistent heat treatment results are non-negotiable, particularly in automotive, bearing, and heavy machinery sectors. * **High-Performance Gears:** **Transmission gears, differential gears, and heavy-duty pinions** requiring precise case depth control for bending and contact fatigue resistance. * **Bearing Components:** **Bearing rings and rollers** where uniform through-hardening is essential for load capacity and life. * **Automotive Safety Components:** **Critical shafts, hubs, and steering components** subject to strict quality control and batch traceability. * **Tooling & Dies:** **Large dies or punches** where predictable hardening depth prevents cracking and ensures uniform wear resistance. * **Heavy Engineering Parts:** **Large axles or cylinders** where a predictable hardness profile through the cross-section is required for design calculations. --- ## **4. International & Equivalent Standards** The "R" designation is specific to the EN standard system for hardenability-guaranteed steels. | Standard System | Equivalent / Comparable Grade | **Key Relationship** | | :--- | :--- | :--- | | **EN 10083-2 (Governing Std.)** | **1.1203 (C55R)** | **The formal specification.** The "R" is integral to the grade designation under this standard. | | **DIN** | **1.1203 + Härtbarkeitsband (e.g., HL)** | Historical German system, now incorporated into EN. | | **AISI/SAE** | **H-Grade Steels (e.g., 1055H)** | **The direct U.S. equivalent concept.** The "H" suffix denotes guaranteed hardenability, exactly analogous to the "R" suffix in EN. | | **ISO 683-18** | **Type 1.1203** with hardenability requirement. | The international framework. | | **JIS** | **No direct "R" equivalent.** S55C with specified hardenability data. | | | **Ovako C55E** | **C55E** | The same base steel *without* the hardenability guarantee. C55R is the quality-assured version for critical apps. | **Crucial Distinction:** **C55R is not just C55 steel.** It is **C55 with a certified hardenability band**. For standard applications, C55E may suffice. For applications where heat treatment consistency directly impacts performance, safety, or cost (e.g., avoiding scrapped batches), **C55R (or 1055H) is the correct specification.** The material certificate will include the Jominy test results. --- ## **5. Key Advantages & Considerations** **Advantages:** * **Predictable Heat Treatment Results:** Eliminates batch-to-batch variation in hardening depth, enabling robust process design and consistent part performance. * **Enables Optimized Design:** Allows engineers to confidently design parts to specific core hardness requirements, potentially enabling weight or size reduction. * **Reduces Production Risk:** Minimizes scrap and rework due to unexpected soft spots or quench cracking from material variability. * **Quality Assurance:** Provides verifiable, quantitative data (Jominy curve) for quality audits and traceability, especially important in regulated industries like automotive. **Considerations:** * **Higher Cost:** Premium over non-hardenability-guaranteed grades (C55E) due to additional testing and tighter process controls. * **Requires Knowledge to Apply:** The designer/heat treater must understand how to use the Jominy data to predict results for their specific part geometry and quench process. * **Same Base Limitations:** Inherits the inherent characteristics of high-carbon steel: **low toughness, high crack sensitivity during quenching, and poor weldability.** * **Must Specify the Band:** Simply ordering "C55R" is insufficient. The required hardenability band (e.g., according to EN 10083-2 tables or a customer-specific range) must be specified in the order. --- **Disclaimer:** The successful use of Ovako C55R hinges on **utilizing the provided hardenability data.** It is imperative to: 1. **Specify the required hardenability band (e.g., HL, HM) when ordering.** 2. **Use the Jominy data from the material certificate** to simulate or calculate the hardening profile for the specific component geometry and quenching conditions. 3. **Still validate the heat treatment process** on first-article components, as the hardenability guarantee ensures material consistency but does not account for furnace or quench tank variability. 4. Remember that this steel requires final customer heat treatment to achieve its service properties. -:- For detailed product information, please contact sales. -: Ovako C55R EN 10083-2:2006 (ref) Steel, Hardening Specification Dimensions Size： Diameter 20-1000 mm Length <5094 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 C55R EN 10083-2:2006 (ref) Steel, Hardening Properties -:- For detailed product information, please contact sales. -:

Applications of Ovako C55R EN 10083-2:2006 (ref) Steel Foil, Hardening -:- For detailed product information, please contact sales. -: Chemical Identifiers Ovako C55R EN 10083-2:2006 (ref) Steel Foil, Hardening -:- For detailed product information, please contact sales. -:

Packing of Ovako C55R EN 10083-2:2006 (ref) Steel Foil/Strip, Hardening -:- 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 Foil/Strip 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 1565 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