ATI Allvac® Vasco® 9-4-30 Specialty Steel Sheet,Plate

ATI Allvac® Vasco® 9-4-30 Specialty Steel Sheet/Plate, Heat Treatment: 899°C (1650°F) + Age Product Information -:- For detailed product information, please contact sales. -: ATI Allvac® Vasco® 9-4-30 Specialty Steel Sheet/Plate, Heat Treatment: 899°C (1650°F) + Age Synonyms -:- For detailed product information, please contact sales. -:

ATI Allvac® Vasco® 9-4-30 Specialty Steel, Heat Treatment: 899°C (1650°F) + Age Product Information -:- For detailed product information, please contact sales. -: # ATI Allvac® Vasco® 9-4-30 Specialty Steel ## Precipitation-Hardening Cobalt-Nickel Steel | Heat Treated to 899°C + Aged --- ### **Product Overview** ATI Allvac® Vasco® 9-4-30 is a **premium, precipitation-hardenable, cobalt-nickel secondary hardening steel** designed for exceptional **high-temperature strength, hot hardness, and wear resistance**. Unlike conventional maraging steels, it utilizes a **secondary hardening mechanism** involving the precipitation of complex carbides (primarily M₂C type) during aging after a high-temperature austenitization. The specified heat treatment of **austenitizing at 899°C (1650°F) followed by aging** optimizes this alloy for applications requiring **sustained performance at temperatures up to 540°C (1000°F)**, making it superior to standard maraging steels in hot-work environments. --- ### **Chemical Composition (Weight %)** | Element | Min (%) | Max (%) | Typical (%) | Primary Function | |---------|---------|---------|-------------|------------------| | **Cobalt (Co)** | 28.0 | 30.0 | 29.0 | **Matrix strengthener;** promotes secondary hardening, provides solid solution strength and hot hardness. | | **Nickel (Ni)** | 8.0 | 10.0 | 9.0 | **Austenite stabilizer;** ensures a tough, ductile matrix and controls transformation behavior. | | **Chromium (Cr)** | 3.5 | 4.5 | 4.0 | Provides **moderate corrosion/oxidation resistance** and contributes to carbide formation. | | **Molybdenum (Mo)** | 1.2 | 1.8 | 1.5 | Key **carbide former (M₂C);** primary source of secondary hardening and wear resistance. | | **Tungsten (W)** | 1.2 | 1.8 | 1.5 | Synergizes with Mo; enhances **hot hardness and temper resistance.** | | **Vanadium (V)** | 0.70 | 1.10 | 0.90 | Forms fine, stable **VC/V₄C₃ carbides;** refines grain and contributes to wear resistance. | | **Carbon (C)** | 0.25 | 0.35 | 0.30 | **Essential for secondary hardening;** forms the complex carbides responsible for peak strength. | | **Manganese (Mn)** | — | 0.50 | 0.25 | Residual, aids in deoxidation. | | **Silicon (Si)** | — | 0.50 | 0.25 | Residual, deoxidizer. | | **Sulfur (S)** | — | 0.010 | 0.003 | Impurity control. | | **Phosphorus (P)** | — | 0.015 | 0.010 | Impurity control. | | **Iron (Fe)** | Balance | — | — | Base element. | **Key Metallurgical Distinction:** This is **not a low-carbon maraging steel.** Its **0.30% Carbon** content is fundamental to its secondary hardening mechanism via carbide precipitation (M₂C, MC types), differing from the intermetallic (Ni₃Mo, Ni₃Ti) precipitation in maraging steels. --- ### **Recommended Heat Treatment** 1. **Austenitizing (Solution Treatment):** * **Temperature:** **899°C (1650°F)** ± 10°C * **Time:** 1-2 hours per inch of thickness, then **Oil Quench** or **Air Cool** (depending on section size). * **Purpose:** Dissolves carbides, homogenizes the austenite, and sets the stage for martensite formation upon cooling. 2. **Conditioning (Optional but Critical):** * A **sub-zero treatment** at -73°C (-100°F) is **highly recommended** after quenching to transform any retained austenite to martensite, maximizing hardness and dimensional stability. 3. **Tempering/Aging (Secondary Hardening):** * **Temperature:** **480-540°C (900-1000°F)** – Specific temperature is selected based on the desired balance of hardness and toughness. * **Time:** 2-4 hours per temper, **double tempering is standard.** * **Phenomenon:** During tempering in this range, fine, coherent alloy carbides (M₂C, where M=Mo, W) precipitate within the martensite, causing a **significant increase in hardness (secondary hardening peak)**. --- ### **Mechanical Properties (After 899°C Austenitize + Aged/Tempered)** *Properties after oil quenching from 899°C and double tempering at ~540°C (1000°F).* | Property | Typical Value (Room Temp) | Value at 540°C (1000°F) | Notes | |----------|--------------------------|-------------------------|-------| | **Ultimate Tensile Strength** | 1650 - 1800 MPa (239 - 261 ksi) | ~1000 - 1100 MPa (145 - 160 ksi) | Excellent high-temperature retention. | | **0.2% Yield Strength** | 1550 - 1700 MPa (225 - 247 ksi) | ~900 - 1000 MPa (131 - 145 ksi) | | | **Elongation (in 50 mm)** | 8 - 12% | 10 - 15% | | | **Reduction of Area** | 35 - 50% | 40 - 55% | | | **Hardness** | **52 - 56 HRC** | **45 - 50 HRC** | **Key property:** Exceptional hot hardness. | | **Impact Energy (Charpy V)** | 20 - 35 J | Data Specific | | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | ~175 GPa | | **Key Performance Feature:** Maintains a high percentage of its room-temperature hardness and strength at **elevated temperatures (540°C / 1000°F)**, far exceeding the capability of standard maraging steels which rapidly over-age above ~480°C (900°F). --- ### **Physical Properties** | Property | Value (at 20°C) | |----------|------------------| | **Density** | ~8.3 g/cm³ (Higher due to high Co content) | | **Melting Range** | ~1350-1400°C (2460-2550°F) | | **Thermal Conductivity** | 18 - 22 W/m·K | | **Coefficient of Thermal Expansion** | 11.5 - 12.5 x 10⁻⁶/°C (20-100°C) | | **Magnetic Properties** | Predominantly martensitic; magnetic. | --- ### **Key Characteristics & Advantages** * **Superior Hot Hardness & Red Hardness:** Outstanding ability to retain hardness and resist softening at high temperatures (up to 540°C/1000°F). * **Excellent Wear & Galling Resistance:** The hard martensitic matrix with fine carbides provides excellent resistance to abrasive and adhesive wear. * **Good Dimensional Stability:** When properly heat treated (including sub-zero treatment), it exhibits low distortion and high stability. * **Moderate Corrosion/Oxidation Resistance:** The 4% Cr provides better resistance to scaling and oxidation than tool steels like H13, but it is **not stainless**. * **High Compressive Strength:** Ideal for applications involving high contact stresses. --- ### **International Standards & Equivalents** Vasco 9-4-30 is a proprietary alloy. Close equivalents exist, but exact composition and processing are specific to ATI. | Country/Standard | Similar Designation | Notes | |------------------|---------------------|-------| | **USA (Proprietary)** | **ATI Allvac Vasco 9-4-30** (AMS 5894) | The primary standard. AMS 5894 covers the bar and forging form. | | **USA (Aerospace)** | **AMS 5894** | Aerospace Material Specification for "Steel, Bars and Forgings, Corrosion Resistant 9Co - 4Cr - 1.5Mo - 1.5W - 0.90V (0.30C) (Vasco 9-4-30)" | | **Europe** | Similar to **X19NiCoMoW** or proprietary grades like **W720 (Böhler)**. | Not direct equivalents, but similar in concept (Co-Ni secondary hardening steels). | | **General** | Often classified as an **Ultra-High-Strength Steel** or **Hot-Work Die Steel variant**. | | --- ### **Primary Applications** This alloy is specified for demanding applications where **high strength and hardness must be maintained under hot, abrasive, or high-stress conditions**. 1. **Aerospace & Defense:** * **High-Temperature Bearings and Bushings** for jet engines and airframes. * **Landing Gear Components** subject to high wear and stress. * **Missile Guidance System Components.** * **Actuator Components** in high-temperature environments. 2. **Tooling & Die Making (Primary Use):** * **Hot-Work Dies and Inserts** for forging, extrusion, and die-casting (especially for aluminum and brass). Superior to H13 at higher operating temperatures. * **Precision Gages and Fixtures** that must maintain dimensions under load. * **Mandrels and Core Rods** for high-temperature forming. * **Wear Plates** for injection molding machines. 3. **Oil & Gas:** * **Downhole Tool Components** (e.g., wear sleeves, valve parts) in high-pressure, high-temperature (HPHT) wells. * **Parts for Measurement While Drilling (MWD) tools.** 4. **Industrial Machinery:** * **High-Performance Gears and Shafts** operating in hot environments. * **Knives and Blades** for high-temperature cutting applications. --- ### **Fabrication & Processing Notes** * **Machining:** Best machined in the **soft-annealed condition** (~300 HB). Machining in the hardened state is very difficult and requires carbide or CBN tooling. * **Grinding:** The preferred method for finishing hardened components. Use proper techniques to avoid grinding burns. * **Welding:** Can be welded using **matching filler metal** and strict pre-heat (~260°C/500°F) and post-weld heat treatment (PWHT) procedures to restore properties. **Not recommended for novice welders.** * **Heat Treatment:** Must be performed precisely according to ATI recommendations. The **sub-zero treatment is critical** for maximum performance and stability. * **Corrosion Protection:** While it has 4% Cr, it is not fully stainless. For corrosive environments, consider **nitriding, hard chromium plating, or PVD coatings** for enhanced surface properties. --- ### **Comparison with Maraging Steels** | Feature | Vasco 9-4-30 | 18Ni Maraging Steels (e.g., 300) | |---------|--------------|----------------------------------| | **Strengthening Mechanism** | Secondary Hardening (Carbide Precipitation) | Precipitation Hardening (Intermetallic) | | **Key Elements** | High Co (29%), C (0.30%), Mo, W, V | High Ni (18%), Co, Mo, Ti, **Low C** | | **Peak Service Temperature** | **Up to 540°C (1000°F)** | Typically < **480°C (900°F)** | | **Primary Advantage** | **Hot Hardness, Wear Resistance** | **Room-Temp Toughness, Dimensional Stability** | | **Typical Hardness** | 52-56 HRC | 50-54 HRC | | **Fabricability** | More difficult to machine and weld | Excellent in annealed condition | --- ### **Summary** **ATI Allvac® Vasco® 9-4-30**, when heat treated via the **899°C (1650°F) austenitize and age** cycle, is a **specialized, high-performance engineering alloy** that excels where heat and wear are the dominant failure modes. Its **high cobalt and carbon content**, enabling a powerful secondary hardening response, set it apart from low-carbon maraging steels. It is the material of choice for engineers facing the challenge of **maintaining extreme mechanical integrity in persistently hot environments**, particularly in advanced tooling, aerospace, and energy applications where conventional high-speed or hot-work steels reach their limits. Its superior hot hardness justifies its higher cost and more complex processing for these critical use cases. -:- For detailed product information, please contact sales. -: ATI Allvac® Vasco® 9-4-30 Specialty Steel, Heat Treatment: 899°C (1650°F) + Age Specification Dimensions Size： Diameter 20-1000 mm Length <7360 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. -: ATI Allvac® Vasco® 9-4-30 Specialty Steel, Heat Treatment: 899°C (1650°F) + Age Properties -:- For detailed product information, please contact sales. -:

Applications of ATI Allvac® Vasco® 9-4-30 Specialty Steel Sheet,Plate, Heat Treatment: 899°C (1650°F) + Age -:- For detailed product information, please contact sales. -: Chemical Identifiers ATI Allvac® Vasco® 9-4-30 Specialty Steel Sheet,Plate, Heat Treatment: 899°C (1650°F) + Age -:- For detailed product information, please contact sales. -:

Packing of ATI Allvac® Vasco® 9-4-30 Specialty Steel Sheet/Plate, Heat Treatment: 899°C (1650°F) + Age -:- 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 3831 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