SHKH15-SHD High Carbon Bearing Steel Sheet,Plate

SHKH15-SHD High Carbon Bearing Steel Sheet/Plate (Composition Spec) Product Information -:- For detailed product information, please contact sales. -: SHKH15-SHD High Carbon Bearing Steel Sheet/Plate (Composition Spec) Synonyms -:- For detailed product information, please contact sales. -:

SHKH15-SHD High Carbon Bearing Steel (Composition Spec) Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: SHKH15-SHD High Carbon Bearing Steel (Composition Specification)** --- #### **1. Material Overview** **SHKH15-SHD** is a **Russian/GOST-standardized, high-carbon, chromium alloy bearing steel**, representing a **high-quality, vacuum-arc remelted variant** of the standard **ШХ15 (ShKh15)** grade. The "**CД (SD)**" suffix (Cyrillic for "SHD") specifically denotes **"Vacuum-Arc Remelted"** production. This advanced secondary refining process significantly enhances the steel's purity, leading to exceptional **fatigue life, fracture toughness, and microstructural homogeneity**. It is the premier bearing steel grade within the GOST system, designed for the most demanding applications in aerospace, defense, and high-precision machinery where failure is not an option. #### **2. Key Material Concept: Vacuum-Arc Remelting (VAR) for Ultra-Cleanliness** The **SHD (Vacuum-Arc Remelting)** designation is the core differentiator from standard ШХ15: - **Base Composition:** Similar to standard ШХ15 (and analogous to AISI 52100/100Cr6), with ~1.0% C and ~1.5% Cr. - **VAR Process:** The steel is remelted under high vacuum using a consumable electrode. This process: 1. **Drastically Reduces Gas Content:** Lowers oxygen, hydrogen, and nitrogen to ultra-low levels (e.g., [O] < 10 ppm). 2. **Improves Inclusion Morphology and Distribution:** Promotes the floatation and removal of non-metallic inclusions, resulting in a **"Super Clean"** microstructure with minimal oxide and sulfide stringers. 3. **Enhances Chemical and Microstructural Homogeneity:** Eliminates macrosegregation, leading to uniform carbide distribution and consistent hardenability throughout large ingots. 4. **Result:** The steel achieves superior **contact fatigue strength, rolling contact fatigue (RCF) life, and fracture toughness** compared to air-melted or even vacuum-degassed grades. #### **3. International Standard & Cross-References** - **Primary Standard:** **GOST 801-2018** (or older versions: GOST 801-78). This is the Russian state standard for "Bearing Steels. Specifications." - **Grade Designation:** **ШХ15-СД** (ShKh15-SD) in Cyrillic. "ШХ" stands for "Bearing Steel, Chromium," "15" indicates ~1.5% Cr, and "СД" means "Vacuum-Arc Remelted." - **Closest International Equivalents:** - **AISI/SAE:** **E52100 VAR** (Vacuum Arc Remelted) - **EN/DIN:** **1.3505 (100Cr6) VAR** or **1.3547 (100Cr6 ESR)** for Electroslag Remelted quality. - **JIS:** **SUJ2** in "Super Clean" or special melted quality. - **Quality Level:** Represents the **highest quality tier** within the GOST bearing steel system, comparable to "Ultra-Clean" or "Aerospace Quality" in Western standards. #### **4. Chemical Composition (% by Weight, per GOST 801)** | Element | Content Range (%) | Key Role in SHD Quality | | :--- | :--- | :--- | | **Carbon (C)** | **0.95 – 1.05** | Provides high hardness and carbide volume. Tight control ensures consistency. | | **Silicon (Si)** | **0.17 – 0.37** | Deoxidizer. | | **Manganese (Mn)** | **0.20 – 0.40** | Contributes to hardenability. | | **Chromium (Cr)** | **1.30 – 1.65** | **Key alloying element.** Provides hardenability and forms wear-resistant carbides. | | **Phosphorus (P)** | **≤ 0.020** | Very low to prevent embrittlement. | | **Sulfur (S)** | **≤ 0.010** | **Extremely low** – critical for maximizing fatigue life; VAR process enables this. | | **Nickel (Ni)** | **≤ 0.25** | Residual; tightly controlled. | | **Copper (Cu)** | **≤ 0.20** | Residual; tightly controlled. | | **Gases (O, H, N)** | **Specified at very low levels** | **Defining SHD characteristic.** Oxygen often ≤ 10 ppm. | #### **5. Typical Physical & Mechanical Properties** **A. Physical Properties:** - **Density:** 7.83 g/cm³ - **Modulus of Elasticity:** 210 GPa - **Thermal Conductivity:** 46 W/m·K **B. Mechanical Properties (After Standard Bearing Heat Treatment):** - **Hardness:** **62 – 66 HRC** (after quenching and low-temp tempering). Achieves high, uniform hardness. - **Contact Fatigue Life (L10):** **30-100% higher** than standard air-melted ШХ15/52100 due to ultra-cleanliness. - **Bending Fatigue Strength:** Excellent. - **Fracture Toughness (K1C):** Superior to standard grades due to clean microstructure and fine carbide distribution. - **Dimensional Stability:** Exceptional, with minimal retained austenite. #### **6. Processing & Fabrication Characteristics** - **Hardenability:** **Excellent and Consistent.** The VAR process ensures uniform chemical composition, leading to predictable and uniform depth of hardening. - **Machinability (Annealed):** **Fair to Poor.** Similar to other high-carbon bearing steels; the clean microstructure does not significantly improve machinability. - **Grindability:** **Excellent.** The homogeneous structure allows for precise grinding without subsurface damage. - **Weldability:** **Very Poor.** Not recommended for any structural applications. - **Forging & Hot Working:** Performs well, but requires controlled conditions to preserve the premium quality. #### **7. Primary Applications** SHKH15-SHD is mandated for extreme-performance and safety-critical applications: - **Aerospace & Defense:** **Critical aircraft engine bearings** (main shaft, gearbox), **helicopter rotor bearings**, **missile guidance system bearings**, and **armored vehicle transmission bearings**. - **High-Speed Machine Tool Spindles:** **Precision grinding spindles, CNC milling spindles, and high-speed bearings** where minimal runout and long life are essential. - **Specialized Industrial Machinery:** Bearings in **high-load, high-RPM turbines, compressors, and pumps** in the energy sector. - **Precision Measuring Instruments:** **Ultra-precision gauge blocks and standards** requiring supreme dimensional stability. - **Racing & High-Performance Automotive:** **Formula 1 gearbox bearings, turbocharger bearings**, and other critical drivetrain components. #### **8. Available Forms & Quality Assurance** - **Forms:** **Primarily supplied as forged or rolled bars, billets, and sometimes as semi-finished rings or tubes** from specialized mills. - **Quality Assurance:** Subject to **rigorous testing** beyond standard grades, including: - **Ultrasonic Testing (UT)** for internal defects. - **Advanced inclusion rating** (e.g., GOST 1778, ASTM E45 Method D with stricter limits). - **Microstructural analysis** for carbide network, grain size, and banding. - **Chemical analysis** for trace elements and gases. - **Certification:** Requires full **traceability and a comprehensive material certificate** confirming VAR process and all test results. #### **9. Comparison with Standard Grades** | Aspect | Standard ШХ15 / 52100 | **SHKH15-SHD (VAR)** | | :--- | :--- | :--- | | **Melting Process** | Electric Arc Furnace + Ladle Refining. | **Vacuum-Arc Remelting (Secondary Refining).** | | **Inclusion Content** | Standard "Bearing Quality." | **"Ultra-Clean" / "Super Clean."** | | **Oxygen Content** | Typically 5-15 ppm. | **Typically ≤ 10 ppm, often near 5 ppm.** | | **Fatigue Life** | Baseline. | **Significantly Enhanced (30-100%+).** | | **Cost** | Standard market price. | **Premium (2-5x higher).** | | **Application** | General industrial bearings. | **Critical Aerospace/Defense/High-Precision.** | --- **Disclaimer:** SHKH15-SHD is a **specialized, high-cost material** justified only by extreme performance requirements. It is not a drop-in replacement for standard bearing steel. Procurement is typically through specialized metallurgical suppliers with expertise in high-performance alloys and adherence to strict quality protocols (e.g., NADCAP). The use of this material often requires **customer approval of the mill source and processing route**. For non-critical applications, standard ШХ15 or equivalent grades are technically and economically sufficient. -:- For detailed product information, please contact sales. -: SHKH15-SHD High Carbon Bearing Steel (Composition Spec) Specification Dimensions Size： Diameter 20-1000 mm Length <5199 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. -: SHKH15-SHD High Carbon Bearing Steel (Composition Spec) Properties -:- For detailed product information, please contact sales. -:

Applications of SHKH15-SHD High Carbon Bearing Steel Sheet,Plate (Composition Spec) -:- For detailed product information, please contact sales. -: Chemical Identifiers SHKH15-SHD High Carbon Bearing Steel Sheet,Plate (Composition Spec) -:- For detailed product information, please contact sales. -:

Packing of SHKH15-SHD High Carbon Bearing Steel Sheet/Plate (Composition Spec) -:- 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 Sheet/Plate 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 1670 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