AISI 9255 Steel Capillary

AISI 9255 Steel Capillary, oil quenched from 885°C (1625°F), 540°C (1000°F) temper Product Information -:- For detailed product information, please contact sales. -: AISI 9255 Steel Capillary, oil quenched from 885°C (1625°F), 540°C (1000°F) temper Synonyms -:- For detailed product information, please contact sales. -:

AISI 9255 Steel, oil quenched from 885°C (1625°F), 540°C (1000°F) temper Product Information -:- For detailed product information, please contact sales. -: **Product Introduction: AISI 9255 Steel, Oil Quenched & Tempered** **1. Product Overview** AISI 9255 is a high-silicon, high-carbon spring steel engineered for supreme performance in demanding applications. This product is supplied in a **fully heat-treated condition**: oil quenched from 885°C (1625°F) and tempered at 540°C (1000°F). This specific thermal processing regimen unlocks the material's ultimate potential, yielding an exceptional combination of very high strength, excellent toughness, and outstanding fatigue resistance. It is a ready-to-use solution for critical components where maximum resilience under cyclic loading is required. **2. International Standards & Designations** This high-performance grade is recognized under key international standards: * **AISI (USA):** 9255 * **ASTM (USA):** A29 (Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought) * **SAE (USA):** J403, J412 (Chemical Composition) * **UNS:** G92550 * **EN (Europe):** 55Si7 (1.0909) - The closest comparable grade. * **JIS (Japan):** SUP7 - A similar silicon-manganese spring steel. **3. Chemical Composition (Typical % by Weight)** The carefully balanced chemistry is the foundation of its superior properties. * **Carbon (C):** 0.50 - 0.60 * **Manganese (Mn):** 0.70 - 0.95 * **Silicon (Si):** 1.80 - 2.20 *(Key element: provides solid solution strengthening, high hardenability, and resistance to temper softening)* * **Phosphorus (P):** ≤ 0.035 * **Sulfur (S):** ≤ 0.040 * **Iron (Fe):** Balance **4. Physical & Mechanical Properties (Quenched & Tempered Condition)** The **885°C Quench + 540°C Temper** treatment produces a tempered martensite microstructure, optimized for high-strength spring applications. * **Condition:** Oil Quenched (885°C / 1625°F) and Tempered (540°C / 1000°F) * **Hardness:** 40 - 46 HRC (Typical aim ~43 HRC) * **Tensile Strength:** 1550 - 1725 MPa (225 - 250 ksi) * **Yield Strength (0.2% Offset):** ~1380 MPa (200 ksi) * **Elongation (in 50 mm):** ~10% * **Reduction of Area:** ~35% * **Modulus of Elasticity:** ~205 GPa (30 x 10⁶ psi) * **Fatigue Strength (Rotating Beam, polished):** Very High (> ~620 MPa / 90 ksi) * **Density:** 7.85 g/cm³ **5. Key Product Features & Benefits** * **Exceptional Fatigue Life:** The primary benefit, ideal for components undergoing millions of stress cycles. * **High Strength-to-Weight Ratio:** Provides significant load capacity in a compact design. * **Excellent Elastic Limit & Resilience:** Can absorb and return substantial energy without permanent deformation. * **Good Toughness at High Strength:** The 540°C temper provides an optimal balance, preventing brittle failure. * **Resistance to Tempering (due to Si):** The high silicon content allows tempering at this relatively high temperature (540°C) while retaining high hardness, which also provides good stress-relief and dimensional stability. **6. Primary Applications** This material is specified for the most critical, high-stress dynamic applications: * **Heavy-Duty Coil Springs:** For high-performance automotive racing suspensions, heavy truck suspensions, and industrial shock absorbers. * **Critical Leaf Springs:** Especially for commercial vehicles and railway freight cars. * **High-Load Torsion Bars and Stabilizer Bars.** * **Aerospace Grade Springs:** Including landing gear components and control system springs. * **High-Pressure Valve Springs** in demanding internal combustion engines. * **Industrial Disc Springs (Belleville Washers)** for high-force, limited-deflection applications. **7. Processing Considerations** * **Final State:** This product is supplied in a **ready-to-install** condition. No further heat treatment is required or recommended. * **Machining & Grinding:** Machining is difficult and should be minimized. Any required finishing (e.g., grinding) must be done with light passes and ample coolant to prevent localized overheating and loss of temper. * **Forming:** No cold forming is possible in this hardened state. * **Welding:** **Strongly Discouraged.** The high carbon equivalent makes it extremely prone to cracking. If repair is absolutely necessary, it requires specialized procedures including full pre-heat, post-heat (tempering), and use of matching high-strength filler metals. **Conclusion** AISI 9255 steel in the oil-quenched and tempered condition (885°C / 540°C) represents the pinnacle of spring steel performance. It delivers an unparalleled combination of ultra-high strength, formidable toughness, and legendary fatigue resistance, making it the material of choice for engineers designing safety-critical components that must endure extreme cyclic stresses without failure. Supplied as a finished product, it guarantees consistent, reliable performance for the most demanding applications worldwide. -:- For detailed product information, please contact sales. -: AISI 9255 Steel, oil quenched from 885°C (1625°F), 540°C (1000°F) temper Specification Dimensions Size： Diameter 20-1000 mm Length <6394 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 9255 Steel, oil quenched from 885°C (1625°F), 540°C (1000°F) temper Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 9255 Steel Capillary, oil quenched from 885°C (1625°F), 540°C (1000°F) temper -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 9255 Steel Capillary, oil quenched from 885°C (1625°F), 540°C (1000°F) temper -:- For detailed product information, please contact sales. -:

Packing of AISI 9255 Steel Capillary, oil quenched from 885°C (1625°F), 540°C (1000°F) temper -:- 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 2865 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