100CrMnMoSi8-4-6 827B Steel Capillary

Ovako 100CrMnMoSi8-4-6 827B Steel Capillary, Spheroidize annealing Product Information -:- For detailed product information, please contact sales. -: Ovako 100CrMnMoSi8-4-6 827B Steel Capillary, Spheroidize annealing Synonyms -:- For detailed product information, please contact sales. -:

Ovako 100CrMnMoSi8-4-6 827B Steel, Spheroidize annealing Product Information -:- For detailed product information, please contact sales. -: # **Ovako 100CrMnMoSi8-4-6 827B Steel – Spheroidize Annealed Condition** ## **Product Overview** Ovako 100CrMnMoSi8-4-6 827B is a **high-performance, medium-alloy case-hardening steel** supplied in a **spheroidize annealed condition**. Distinguished from standard 100Cr6 bearing steels, this alloy features a significantly higher content of manganese, molybdenum, and silicon, providing **exceptional hardenability, core strength, and toughness**. The **"827B"** designation represents Ovako's premium quality grade for this specific chemistry, characterized by **enhanced micro-cleanliness and controlled processing**. The spheroidize annealed microstructure delivers optimal machinability and prepares the material for subsequent carburizing or carbonitriding processes, making it ideal for manufacturing large, heavily loaded components requiring a hard, wear-resistant case and a very strong, tough core. ## **Key Features & Benefits** * **Exceptional Core Properties After Case Hardening:** The alloy's high manganese and molybdenum content ensures deep and uniform hardenability, resulting in a **very strong and tough martensitic or bainitic core** (typically 38-48 HRC after carburizing and heat treatment) with high tensile and yield strength, capable of supporting heavy loads. * **Superior Hardenability for Large Sections:** Designed to through-harden in large cross-sections even with moderate quenching rates. This makes it suitable for **large gear blanks, thick-walled bearings, and heavy-duty components** where standard 100Cr6 would exhibit a soft core. * **Excellent Machinability in Annealed State:** The spheroidize annealed condition provides a uniform hardness of ~200 HB and a fine globular carbide structure, ensuring **good chip formation, extended tool life, and efficient machining** of complex geometries prior to heat treatment. * **Optimized for Carburizing & Carbonitriding:** The chemistry is tailored to respond well to case-hardening processes, allowing for the development of a **deep, hard, and wear-resistant case** with good fatigue properties. The silicon content aids in maintaining core toughness during heat treatment. * **Enhanced Fatigue and Impact Resistance:** The combination of a strong, ductile core and a hard case provides outstanding resistance to bending fatigue, contact fatigue, and impact loading, making it suitable for the most demanding power transmission applications. ## **International Standards & Designations** This steel corresponds to a specific, high-hardenability case-hardening grade within European and international standards. | Region/Standard | Standard Designation | Common Name / Equivalent | | :--- | :--- | :--- | | **EUR (EN)** | **1.6527** | The direct standard designation for this specific analysis. The name **100CrMnMoSi8-4-6** describes its chemistry. | | **ISO** | **ISO 683-11: Type 20** | Similar in function to high-hardenability case-hardening steels like **20NiCrMo2-2** or **SAE 4320/8822**, but with a unique, higher-alloy composition. | | **Germany (DIN / W-Nr.)** | **100CrMnMoSi8-4-6 / 1.6527** | Often used in heavy industry specifications. | | **Ovako Designation** | **827B** | "827" correlates with the material number 1.6527; **"B"** denotes a specific, controlled quality level within Ovako's production. | ## **Chemical Composition (Typical - %)** The composition defines its high-hardenability and strength characteristics. | Element | Content (%) | Role | | :--- | :--- | :--- | | **Carbon (C)** | 0.90 - 1.05 | Provides a strong, hardenable core base. Lower than 100Cr6 to optimize core toughness after case hardening. | | **Chromium (Cr)** | 1.80 - 2.10 | Enhances hardenability, promotes fine carbides in the case, and improves wear resistance. | | **Manganese (Mn)** | 0.60 - 0.90 | **High content.** Dramatically increases hardenability and core strength. Aids in deoxidation. | | **Molybdenum (Mo)** | 0.30 - 0.50 | **Key alloying element.** Greatly enhances hardenability, refines grain structure, improves toughness at high strength levels, and increases tempering resistance. | | **Silicon (Si)** | 0.40 - 0.70 | **Elevated content.** A powerful solid solution strengthener for the ferrite core. Increases tempering resistance and improves toughness by suppressing brittle cementite formation. | | **Nickel (Ni)** | ≤ 0.25 | Residual; may be present in small amounts. | | **Sulfur (S)** | ≤ 0.010 | Kept low to ensure good transverse toughness and fatigue properties. | | **Phosphorus (P)** | ≤ 0.015 | Kept very low. | | **Iron (Fe)** | Balance | | ## **Physical & Mechanical Properties (Spheroidize Annealed Condition)** * **Delivery Hardness:** **190 - 220 HB** (Typical aim: ~205 HB) * **Microstructure:** **Spheroidized carbides** in a ferritic matrix. * **Tensile Strength:** ~700 - 850 MPa * **Yield Strength (Rp0.2):** ~450 - 600 MPa * **Elongation (A5):** ≥ 15% * **Machinability:** Good, comparable to other annealed alloy steels of similar hardness. ## **Properties After Case Hardening & Heat Treatment** * **Surface Case Properties (after carburizing):** * **Surface Hardness:** **58 - 63 HRC** (after tempering) * **Effective Case Depth:** Customizable, typically 1.0 - 4.0+ mm. * **Core Properties:** * **Core Hardness:** **38 - 48 HRC** (Depends on part size and quench severity) * **Core Tensile Strength:** ~1200 - 1600 MPa * **Core Toughness:** Very good for the achieved strength level, due to the Mo and Si content. ## **Typical Applications** This material is engineered for large, high-stress components in heavy industry. * **Large-Diameter Heavy-Duty Gearing:** Main drive gears, pinions, and planetary gears for wind turbines, mining equipment, marine propulsion, and heavy industrial gearboxes. * **Large Bearing Races & Slewing Rings:** For cranes, excavators, wind turbine yaw/pitch systems, and radar platforms. * **Heavy-Duty Axles & Shafts:** Subjected to high bending and torsional loads. * **Critical Components in Oil & Gas Industry:** Large pins, links, and transmission parts in drilling and pumping equipment. * **Forging Die Inserts & Tooling Bases:** Requiring high core strength and stability. ## **Processing Guidelines** * **Machining:** Perform all rough and finish machining in the soft, spheroidize annealed condition. * **Case Hardening Process:** 1. **Carburizing/Carbonitriding:** At 880-930°C to achieve desired case depth and carbon profile. 2. **Hardening:** Reheat to 800-850°C (core austenitizing temperature) and quench in oil or high-pressure gas. The high hardenability allows for full hardening of large sections with moderate quench rates. 3. **Tempering:** Typically at 150-200°C to relieve stresses while maintaining high hardness. * **Post-Hardening Finishing:** Final grinding of case-hardened surfaces. ## **Summary** **Ovako 100CrMnMoSi8-4-6 827B Steel in the Spheroidize Annealed condition** is a **premium engineering steel designed for extreme mechanical demands**. Its unique, highly alloyed chemistry provides a combination of deep hardenability, high core strength, and good toughness that is unmatched by standard bearing steels. It is the material of choice for engineers designing the largest and most critically loaded gears, bearings, and structural components in heavy machinery, where performance and reliability under maximum stress are paramount. The 827B quality ensures this performance is delivered with consistency and material integrity. -:- For detailed product information, please contact sales. -: Ovako 100CrMnMoSi8-4-6 827B Steel, Spheroidize annealing Specification Dimensions Size： Diameter 20-1000 mm Length <5286 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 100CrMnMoSi8-4-6 827B Steel, Spheroidize annealing Properties -:- For detailed product information, please contact sales. -:

Applications of Ovako 100CrMnMoSi8-4-6 827B Steel Capillary, Spheroidize annealing -:- For detailed product information, please contact sales. -: Chemical Identifiers Ovako 100CrMnMoSi8-4-6 827B Steel Capillary, Spheroidize annealing -:- For detailed product information, please contact sales. -:

Packing of Ovako 100CrMnMoSi8-4-6 827B Steel Capillary, Spheroidize annealing -:- 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 1757 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