AISI Type S5 Tool Steel Wire

AISI Type S5 Tool Steel Wire, austenitized 855-870°C (1575-1600°F), oil quenched to 55 HRC Product Information -:- For detailed product information, please contact sales. -: AISI Type S5 Tool Steel Wire, austenitized 855-870°C (1575-1600°F), oil quenched to 55 HRC Synonyms -:- For detailed product information, please contact sales. -:

AISI Type S5 Tool Steel, austenitized 855-870°C (1575-1600°F), oil quenched to 55 HRC Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI Type S5 Shock-Resisting Tool Steel (UNS T41905) - High Toughness Regimen** ## **Overview** **AISI S5 (UNS T41905)** is a premier **manganese-silicon oil-hardening shock-resisting tool steel**, celebrated for its **exceptional toughness and good wear resistance**. The specified heat treatment—austenitizing at 855-870°C followed by oil quenching to a final hardness of **55 HRC**—represents a **classic and optimized regimen** that unlocks S5's ideal balance of properties. This process yields a tool with **outstanding impact resistance, high strength, and sufficient wear resistance** for the most demanding shearing, punching, and cold chiseling applications, where resistance to chipping and catastrophic fracture is paramount. ## **1. Chemical Composition (Nominal %)** S5's composition is a masterclass in toughness-oriented alloy design. | Element | Content (%) | Primary Function | |---------|------------|------------------| | **Carbon (C)** | 0.50 - 0.65 | Provides fundamental hardenability and matrix strength. Balanced to avoid brittleness while supporting edge integrity. | | **Manganese (Mn)** | 0.60 - 1.00 | **Key element.** Substantially increases hardenability, allowing effective oil quenching. Promotes a fine, tough microstructure. | | **Silicon (Si)** | 1.75 - 2.25 | **Key element.** Dramatically increases toughness and yield strength through solid solution strengthening. Provides excellent resistance to impact fatigue and deformation. | | **Molybdenum (Mo)** | 0.20 - 0.40 | Enhances hardenability, especially in thicker sections, and improves toughness by refining the grain structure. | | **Chromium (Cr)** | ≤ 0.35 | May be present in minor amounts but is not a primary alloying element. | | **Iron (Fe)** | Balance | Base metal. | **Key Chemistry Note:** The **powerful synergy between high silicon (1.75-2.25%) and manganese (0.6-1.0%)** defines S5. Manganese provides the hardenability for oil quenching (safer and less distorting than water quenching), while silicon delivers the legendary toughness. The **molybdenum addition** is critical for ensuring consistent through-hardening and enhancing the already superb toughness. This combination makes S5 one of the toughest oil-hardening steels available. ## **2. Physical & Mechanical Properties** *Properties after austenitizing at 855-870°C and oil quenching to 55 HRC.* | Property | Typical Value / Condition | |----------|--------------------------| | **Density** | ~7.82 g/cm³ (0.283 lb/in³) | | **Melting Point** | ~1500°C (2730°F) | | **Thermal Conductivity** | ~38 W/m·K | | **Coefficient of Thermal Expansion** | ~12.3 × 10⁻⁶/K (20-100°C) | | **Modulus of Elasticity** | 205 GPa (29.7 × 10⁶ psi) | | **Annealed Hardness** | 192-229 HB | | **As-Quenched Hardness (Oil)** | Can reach 60-63 HRC. | | **Final Hardness** | **54-56 HRC** (Target 55 HRC). | | **Tensile Strength** | ~1850-2000 MPa (268-290 ksi) | | **Yield Strength (0.2% Offset)** | ~1600-1750 MPa (232-254 ksi) | | **Elongation** | ~10-12% | | **Reduction of Area** | ~35-45% | | **Impact Toughness (Charpy V-Notch)** | **Extremely High.** Typically **80-120 J (59-88 ft-lbf)**. This is among the highest impact resistance of any commercial tool steel at this hardness level. | | **Wear Resistance** | **Good.** Adequate for most shock tool applications; superior to S2 at similar toughness levels. | | **Machinability (Annealed)** | Fair (approx. 50% of 1% carbon steel baseline). | ## **3. International Standards & Cross-References** | Standard | Designation | |----------|------------| | **UNS** | T41905 | | **AISI/ASTM** | S5 (ASTM A681) | | **ISO (International)** | **60SiMn5** (ISO 4957: Tool steels) – A close match, reflecting the high Si-Mn content. | | **DIN (Germany)** | **1.2710** | | **BS (UK)** | **BS5** | | **JIS (Japan)** | No direct common equivalent. | | **GB (China)** | **5CrMnSiMoV** (Reflects a similar, but not identical, alloying approach) | | **Common Name** | **Manganese-Silicon Shock Steel** | ## **4. Product Applications (Hardened to 55 HRC)** This hardness is the **optimum working point for S5**, delivering near-maximum toughness with excellent strength for a vast range of severe-duty applications. **Primary Applications:** * **Heavy-Duty Shearing and Cutting:** * **Shear blades** for metal bars, rods, plates, and wire rope. * **Bolt cutters**, **rebar cutters**, and **cable cutters**. * **Cold chisels** and **masonry chisels** for demanding work. * **Punching and Forming:** * **Heavy-duty punches** for thick sheet metal and plate. * **Punch and die sets** for cold forging and stamping. * **Backing plates** and **bolster plates** for stamping dies. * **Impact Tools:** * **Driver bits** for high-torque impact wrenches. * **Pneumatic hammer tools** (chisels, scaling hammers) where extreme toughness is needed to prevent splintering. * **Mining and Construction:** * **Pick points**, **clay spades**, and **digger teeth**. * **Wear plates** in high-impact ore handling chutes. ## **5. Specified Heat Treatment Process & Rationale** **Process:** 1. **Preheating:** **Mandatory.** Preheat slowly to **650-700°C (1200-1290°F)**. This is critical for a high-silicon steel to minimize thermal shock and distortion. 2. **Austenitizing:** Heat to **855-870°C (1575-1600°F)**. Soak for **20-30 minutes per inch** of cross-section. This temperature range ensures complete austenitization without excessive grain growth. 3. **Quenching:** Quench in **well-agitated, moderate-speed oil** at 40-60°C (105-140°F). The oil quench, enabled by the Mn-Mo content, provides a good balance of cooling speed—fast enough to achieve full hardness but slow enough to minimize distortion and cracking risk compared to water. 4. **Tempering (To Achieve 55 HRC):** * **Temper immediately** after the part reaches hand-warm temperature (50-70°C). * Temper at **315-370°C (600-700°F)** for **1.5-2 hours per inch**. This temperature range is ideal for S5, providing excellent stress relief and maximizing toughness. * **Double tempering is strongly recommended.** Cool in air after each temper. **Why This Treatment is Optimal:** - **55 HRC Target:** This hardness provides the **perfect equilibrium** for S5. It is high enough to provide excellent strength, good wear resistance, and edge retention for cutting/shearing, yet low enough to allow the silicon-toughened matrix to express its full, exceptional impact resistance. - **Oil Quenching:** The defining advantage of S5 over older water-hardening shock steels (like S4). It offers **greater safety, less distortion, and better consistency**, especially for tools with varying cross-sections. - **Tempering in the 315-370°C Range:** This safely avoids any temper brittleness zones and ensures the transformation of any retained austenite to tough, tempered martensite. ## **6. Comparative Advantages** | Property | S5 @ 55 HRC | S2 @ 55 HRC | S7 @ 56 HRC | |----------|-------------|-------------|-------------| | **Toughness** | **Extremely High** | Very High | **Extremely High** | | **Wear Resistance** | Good | Moderate | Good | | **Hardenability / Quench** | **Oil (Forgiving)** | Brine/Water (Severe) | **Air (Most Forgiving)** | | **Distortion Control** | Good | Fair | **Excellent** | | **Primary Use Case** | **Heavy Shearing, Punching** | General Impact Tools | **Precision Impact Tools, Dies** | **Conclusion:** This specific heat treatment of AISI S5 produces arguably the **toughest, most reliable oil-hardening tool available**. It is the **grade of choice for industrial shearing, cutting, and punching applications** where tools are subject to brutal, unpredictable shock loads. The combination of its robust chemistry and this optimized thermal processing results in a tool that consistently outperforms and outlasts alternatives in the most punishing environments. --- **Disclaimer:** The high silicon content of S5 increases its susceptibility to **decarburization** during austenitizing. For optimal performance, use a controlled atmosphere furnace or provide adequate stock allowance for post-heat-treatment grinding to remove the decarburized layer. Always follow the material producer's specific recommended austenitizing times and temperatures for the section size being treated. -:- For detailed product information, please contact sales. -: AISI Type S5 Tool Steel, austenitized 855-870°C (1575-1600°F), oil quenched to 55 HRC Specification Dimensions Size： Diameter 20-1000 mm Length <6760 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. -: AISI Type S5 Tool Steel, austenitized 855-870°C (1575-1600°F), oil quenched to 55 HRC Properties -:- For detailed product information, please contact sales. -:

Applications of AISI Type S5 Tool Steel Wire, austenitized 855-870°C (1575-1600°F), oil quenched to 55 HRC -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI Type S5 Tool Steel Wire, austenitized 855-870°C (1575-1600°F), oil quenched to 55 HRC -:- For detailed product information, please contact sales. -:

Packing of AISI Type S5 Tool Steel Wire, austenitized 855-870°C (1575-1600°F), oil quenched to 55 HRC -:- 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 Wire 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 3231 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