Sandvik SAF 2304

Sandvik SAF 2304 Plate, Sheet and Coil Product Information -:- For detailed product information, please contact sales. -: Sandvik SAF 2304 Plate, Sheet and Coil Synonyms -:- For detailed product information, please contact sales. -:

Sandvik SAF 2304 Plate, Sheet and Coil Product Information -:- For detailed product information, please contact sales. -: # **Product Name: Sandvik SAF 2304 Plate, Sheet and Coil (UNS S32304 / EN 1.4362)** ## **Introduction** Sandvik SAF 2304 in Plate, Sheet, and Coil forms is a **molybdenum-free duplex stainless steel** designed as a high-performance, cost-effective upgrade to standard austenitic grades like 316L. By combining a balanced ferrite-austenite microstructure, it delivers **approximately double the yield strength** of 316L along with **significantly superior resistance to chloride stress corrosion cracking (SCC)**. These product forms provide an optimal solution for structural and general corrosion applications where the enhanced pitting resistance of molybdenum-bearing duplex grades is not essential, but higher strength and SCC resistance are critical for safety, weight reduction, and design efficiency. ## **Key Features** * **High Strength & Weight Reduction:** Yield strength (≥ 400 MPa) allows for the use of thinner sections in tanks, structures, and components compared to 316L, enabling significant material savings and lighter constructions. * **Excellent Stress Corrosion Cracking (SCC) Resistance:** Offers far greater resistance to chloride-induced SCC than 300-series austenitic stainless steels, a key advantage in environments containing chlorides or coastal atmospheres. * **Cost-Effective Performance:** The absence of molybdenum provides a more economical and price-stable alternative to standard duplex grades like 2205, while still delivering the core duplex benefits. * **Good Fabricability:** Can be reliably welded, formed, and machined using practices adapted for duplex stainless steels, offering good toughness and weldability. --- ## **1. Chemical Composition (Typical Weight % - Sandvik Specification)** The composition is optimized for a stable duplex structure without molybdenum. | Element | Content (%) | Element | Content (%) | | :------------- | :------------ | :------------- | :---------- | | Chromium (Cr) | 21.5 - 24.5 | Nickel (Ni) | 3.0 - 5.5 | | Molybdenum (Mo)| ≤ 0.6 | **Nitrogen (N)**| **0.05 - 0.20** | | Manganese (Mn) | ≤ 2.5 | Copper (Cu) | 0.05 - 0.60 | | Silicon (Si) | ≤ 1.0 | Carbon (C) | ≤ 0.030 | | Phosphorus (P) | ≤ 0.040 | Sulfur (S) | ≤ 0.015 | | **Iron (Fe)** | **Balance** | | | **Key Alloying Characteristic:** **No deliberate molybdenum addition.** Corrosion resistance is achieved through high chromium and controlled nitrogen. **PREN Calculation:** PREN = %Cr + 3.3(%Mo) + 16(%N) ≈ **24 - 27** --- ## **2. Physical & Mechanical Properties (Typical - Annealed Condition)** | Property | Value / Range | | :-------------------------------------------- | :-------------------------------- | | Density | 7.8 g/cm³ | | Thermal Conductivity (20°C) | ~19 W/m·K | | Coefficient of Thermal Expansion (20-100°C) | ~13.0 x 10⁻⁶ /K | | Modulus of Elasticity | 200 GPa | | **Tensile Strength (Rm)** | **600 - 820 MPa** | | **Yield Strength (Rp0.2)** | **≥ 400 MPa** | | **Elongation (A in 50mm)** | **≥ 25 %** | | Hardness (Brinell) | 220 - 280 HBW | | **Impact Toughness (Charpy V-notch)** | **> 100 J at -40°C** | **Product Form Definitions:** * **Plate:** Thickness typically ≥ 3mm (0.118"), supplied as single flat pieces. * **Sheet:** Thickness typically < 3mm, supplied as flat pieces or from coil. * **Coil (Strip):** Continuous length of sheet, wound, ideal for high-volume processing. --- ## **3. Product Forms & Applications** **Available Product Forms & Conditions:** * **Plate:** Hot rolled, annealed, and pickled plate; cut-to-size. * **Sheet:** Cold rolled, 2B, 2D, No. 1 finish. * **Coil:** Hot rolled coil, cold rolled coil (Annealed & Pickled, A&P). * **Finishes:** Standard mill finishes, polished options available. **Primary Applications (Upgrading from 304L/316L where SCC is a risk):** SAF 2304 is ideal where 316L is at its limits due to strength or SCC, without the need for molybdenum's pitting resistance. * **Construction & Architecture:** Structural components, bridges, roofing, façades, and walkways in coastal environments or areas using de-icing salts. * **Water & Wastewater Treatment:** Storage tanks, pressure vessels, pipework, and basin covers. * **Chemical & Process Industry:** Tanks, vessels, and piping for mildly corrosive chemicals, organic acids, and sulfate-containing media. * **Pulp & Paper Industry:** Storage tanks, washer drums, and equipment exposed to neutral sulfite liquors. * **Food & Beverage:** Fermentation tanks, brewing vessels, and structural supports. * **Transportation:** Structural parts for railcars, ship interiors, and trailer bodies. * **Heat Exchangers:** For cooling water systems with moderate chloride levels where 316L may suffer from SCC. --- ## **4. International Standards & Approvals** Sandvik SAF 2304 Plate, Sheet, and Coil comply with recognized international standards for this duplex grade. | Standard Type | Standard Number & Designation | Notes | | :------------------ | :--------------------------------------------------------------------------------------------------------------------------- | :-------------------------------------------------------------------- | | **Unified Numbering System (UNS)** | **S32304** | The standard UNS designation for this molybdenum-free duplex alloy. | | **EN / EURONORM (Europe)** | **1.4362** | The common European material number. | | | EN 10088-2: Flat products for general purposes | Key European product standard. | | **ASTM (USA)** | **ASTM A240/A240M** (Plate, Sheet, and Strip for Pressure Vessels and General Application) | The primary procurement standard for plate and sheet in the Americas. | | | **ASTM A480/A480M** (General Requirements for Flat-Rolled Stainless Steel) | Governs dimensional tolerances and delivery conditions. | | **Other Standards** | JIS G4304 / G4305 (Japan) - SUS323J1
GB/T 20878 (China) | Included in major national standards. | --- ## **Critical Technical & Procurement Note** **SAF 2304 is a specific duplex grade chosen for its unique strength-SCC-cost balance.** 1. **Procurement Specification:** Specify **"Sandvik SAF 2304 to ASTM A240 S32304"** or **"EN 1.4362"** to ensure receipt of the correct molybdenum-free duplex grade. 2. **Material Condition:** Supplied in the **solution annealed and pickled condition**. This is essential for achieving the correct duplex microstructure and corrosion resistance. 3. **Fabrication Guidance:** * **Forming:** Requires about 20-30% higher forces than 316L. Adhere to recommended minimum bend radii. * **Welding:** Use qualified procedures. Filler metals such as 2209 are commonly used. Control heat input to avoid excessive ferrite in the weld HAZ. 4. **Corrosion Selection:** Its primary advantage is **SCC resistance, not high pitting resistance**. It is **not suitable** for seawater immersion or high-chloride environments where pitting is the dominant failure mode. For such conditions, **SAF 2205 (S32205)** must be used. 5. **Certification:** Require a **Sandvik Mill Test Certificate (MTC/CMTR)** confirming compliance with the ordered standard, including chemical analysis (showing low Mo) and mechanical properties. This is crucial to distinguish it from other duplex grades. -:- For detailed product information, please contact sales. -: Sandvik SAF 2304 Plate, Sheet and Coil Specification Dimensions Size： Diameter 20-1000 mm Length <7298 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. -: Sandvik SAF 2304 Plate, Sheet and Coil Properties -:- For detailed product information, please contact sales. -:

Applications of Sandvik SAF 2304 Plate, Sheet and Coil -:- For detailed product information, please contact sales. -: Chemical Identifiers Sandvik SAF 2304 Plate, Sheet and Coil -:- For detailed product information, please contact sales. -:

Packing of Sandvik SAF 2304 Plate, Sheet and Coil -:- 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 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 3769 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