Cast Stainless Steel Tube,Pipe HK30, UNS J94203

Cast Stainless Steel Tube HK30, UNS J94203 Product Information -:- For detailed product information, please contact sales. -: Cast Stainless Steel Tube HK30, UNS J94203 Synonyms -:- For detailed product information, please contact sales. -:

Cast Stainless Steel HK30, UNS J94203 Product Information -:- For detailed product information, please contact sales. -: ### **Technical Data Sheet: Cast Stainless Steel HK30 (UNS J94203)** **Product Overview** Cast Stainless Steel HK30, standardized as UNS J94203, is a high-carbon, austenitic heat-resistant alloy. It is specifically designed for sustained service at high temperatures, offering exceptional resistance to oxidation (scaling) and creep strength. Its common "HK" designation originates from the Alloy Casting Institute (ACI), and it is a cornerstone material for critical components in heat processing, petrochemical, and power generation industries. --- #### **1. International Standard Equivalents** HK30 is recognized globally under the following standard specifications: | Standard Organization | Designation | Applicable Specification | | :--- | :--- | :--- | | **UNS (Unified Numbering System)** | **J94203** | - | | **ACI / SFSA (USA)** | **HK-30** | - | | **ASTM International** | **HK30** | ASTM A297 / ASTM A351 (for pressure-containing parts) | | **European Norm (EN)** | **1.4836** | EN 10295 | | **German (DIN)** | **G-X 40 CrNiSi 25-12** | DIN 17445 | | **Japanese (JIS)** | **SCH 21** | JIS G5121 | --- #### **2. Chemical Composition (Weight %)** The composition is balanced to maximize high-temperature performance. | Element | Minimum (%) | Maximum (%) | | :--- | :--- | :--- | | **Carbon (C)** | 0.25 | 0.35 | | **Chromium (Cr)** | 23.0 | 27.0 | | **Nickel (Ni)** | 19.0 | 22.0 | | **Silicon (Si)** | - | 1.75 | | **Manganese (Mn)** | - | 2.00 | | **Phosphorus (P)** | - | 0.04 | | **Sulfur (S)** | - | 0.04 | | **Iron (Fe)** | Balance | | **Key Composition Rationale:** * **Chromium (Cr):** Provides superior oxidation and carburization resistance by forming a protective, adherent layer of chromium oxide (Cr₂O₃). * **Nickel (Ni):** Stabilizes the austenitic matrix, providing high-temperature strength, ductility, and resistance to thermal cycling and creep deformation. * **Carbon (C):** Enhances elevated temperature strength through solid solution strengthening. The higher carbon content (compared to the "H" grade) is key to its creep resistance. --- #### **3. Typical Physical & Mechanical Properties** **Physical Properties (At Room Temperature):** * **Density:** 7.78 g/cm³ (0.281 lb/in³) * **Melting Point:** ~1400 - 1450 °C (2550 - 2640 °F) * **Specific Heat (20°C):** 500 J/kg·K * **Thermal Conductivity:** ~14.5 W/m·K (at 100°C) * **Coefficient of Thermal Expansion:** 16.0 x 10⁻⁶ /K (20 - 100°C) **Room Temperature Mechanical Properties (As-Cast or Solution Annealed - Typical):** * **Tensile Strength:** 510 MPa (74 ksi) min * **Yield Strength (0.2% Offset):** 240 MPa (35 ksi) min * **Elongation (% in 2in/50mm):** 10% min * **Hardness (Brinell):** 170 - 220 HB **High-Temperature Performance:** * **Maximum Service Temperature:** Up to **1150°C (2100°F)** in oxidizing environments. * **Oxidation Resistance:** Excellent. The stable chromium oxide layer provides long-term protection against scaling. * **Creep & Rupture Strength:** Excellent resistance to deformation under stress at high temperatures, making it suitable for load-bearing applications like radiant tubes and furnace supports. --- #### **4. Product Applications** HK30 is the preferred material for complex, load-bearing components operating under severe thermal stress. Its castability allows for intricate geometries not feasible with wrought products. **Primary Industry Applications:** * **Heat Treatment & Industrial Furnaces:** * **Radiant Tubes** (for carburizing, carbonitriding, and annealing furnaces) * Furnace Rolls, Trays, Baskets, and Fixtures * Muffles and Retorts * Burner Nozzles * **Petrochemical & Refining:** * Tube Hangers and Supports in Pyrolysis Heaters & Steam Methane Reformers (SMR) * Transfer Lines and Fittings * **Power Generation:** * Components in boiler systems * Parts for waste-to-energy and biomass incineration plants * **Glass Manufacturing:** * Molds and hardware for glass container production. --- #### **5. Fabrication Notes** * **Casting:** Excellently suited for sand casting and investment casting processes. * **Machining:** Difficult due to its austenitic structure and work-hardening tendency. Requires rigid setups, slow speeds, high feeds, and carbide tooling. * **Welding:** Weldable using shielded metal arc welding (SMAW) or gas tungsten arc welding (GTAW) with matching or over-alloyed filler metals (e.g., ENiCrFe-3). Post-weld heat treatment (solution annealing) is recommended to restore optimum properties. * **Heat Treatment:** The standard heat treatment is **Solution Annealing** at **1065°C - 1150°C (1950°F - 2100°F)**, followed by rapid cooling to dissolve carbides and ensure maximum corrosion and oxidation resistance. --- **Disclaimer:** The values provided are typical and for informational purposes. Actual properties may vary based on casting section size, heat treatment, and foundry practice. For design and procurement, the relevant ASTM, EN, or other international material specifications must be consulted. -:- For detailed product information, please contact sales. -: Cast Stainless Steel HK30, UNS J94203 Specification Dimensions Size： Diameter 20-1000 mm Length <4214 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. -: Cast Stainless Steel HK30, UNS J94203 Properties -:- For detailed product information, please contact sales. -:

Applications of Cast Stainless Steel Tube HK30, UNS J94203 -:- For detailed product information, please contact sales. -: Chemical Identifiers Cast Stainless Steel Tube HK30, UNS J94203 -:- For detailed product information, please contact sales. -:

Packing of Cast Stainless Steel Tube HK30, UNS J94203 -:- 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 Tube 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 685 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