EN S355JR High Manganese, Base Steel Rod/Bar

EN S355JR High Manganese, Structural, Hot Rolled, Base Steel Rod Product Information -:- For detailed product information, please contact sales. -: EN S355JR High Manganese, Structural, Hot Rolled, Base Steel Rod Synonyms -:- For detailed product information, please contact sales. -:

EN S355JR High Manganese, Structural, Hot Rolled, Base Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Name:** EN S355JR Structural Steel, Hot Rolled, Base Material **Overview** EN S355JR is the **standard non-alloy structural steel** within the S355 strength category, defined as a **base material** under the EN 10025-2 standard. The "JR" designation indicates the **basic quality level**, with impact properties verified at room temperature (+20°C). It is a fundamental, cost-effective engineering material offering a balanced combination of high strength, excellent weldability, and good formability in the hot-rolled condition. It is critical to clarify that **S355JR is NOT classified as a "High Manganese" steel**; it is a standard carbon-manganese steel with typical manganese levels for its strength class. The term "High Manganese" is a persistent misnomer and should not be applied to this standard base grade. **Key International Standards** * **Primary Standard:** **EN 10025-2:2019** - Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy structural steels. * **Grade & Quality Designation:** **S355JR** * **S:** Structural Steel. * **355:** Minimum yield strength (ReH) in MPa for nominal thickness **≤ 16 mm**. This value decreases for greater thicknesses as per standard tables. * **JR:** Basic quality designation. **'J'** signifies the steel is impact tested, and **'R'** denotes the test temperature is **Room Temperature (+20°C)**. * **Clarification on "High Manganese":** This is an **incorrect and misleading classification**. The permissible manganese content for S355JR (≤1.60%) is the standard upper limit for this strength class and is not considered "high" in a technical or specialized sense. Its properties are those of a general-purpose base steel. * **Common International Equivalents:** * **ASTM:** **A36** (general-purpose, though strength is lower) or **A572 Grade 50** (closer in strength intent). * **JIS:** **SM490A**. * **GB/T:** **Q355B**. * **ISO:** **ISO 630-2:2021, Grade E355**. **Chemical Composition (Ladle Analysis, % by weight, maximum values per EN 10025-2)** Standard composition designed for manufacturability and cost-efficiency at the S355 strength level. * **Carbon (C):** ≤ **0.22%** * **Manganese (Mn):** ≤ **1.60%** (This is the standard upper limit for the S355 class, not a specially elevated "high" level). * **Phosphorus (P):** ≤ **0.040%** * **Sulphur (S):** ≤ **0.040%** * **Silicon (Si):** ≤ **0.55%** * **Nitrogen (N):** ≤ **0.018%** (for killed steel). * **Carbon Equivalent (CEV):** Typically ~0.40-0.45%. This is an important parameter for welding procedure specification. **Physical & Mechanical Properties (for hot-rolled condition, nominal for thickness ≤ 16 mm)** * **Yield Strength (ReH):** ≥ **355 MPa** (Highest guaranteed value, applicable only for t ≤ 16 mm). * **Tensile Strength (Rm):** **470 - 630 MPa**. * **Elongation at Break (A5):** ≥ **21%** (Minimum, longitudinal test piece). * **Impact Energy (KV):** ≥ **27 J at +20°C** (Longitudinal, Charpy V-notch). **CRITICAL LIMITATION:** This grade has **no guaranteed impact properties below +20°C**. It is not suitable for low-temperature service without specific engineering assessment. * **Density:** **7.85 g/cm³**. * **Modulus of Elasticity:** **210 GPa**. * **Poisson's Ratio:** **0.3**. **Product Features** 1. **High Strength at Competitive Cost:** Provides the high yield strength of the S355 family at the most economical entry point, ideal for applications where low-temperature toughness is not a specified requirement. 2. **Good Weldability (with Procedure):** Weldable with all common processes. Due to its significant carbon equivalent, proper procedure qualification, use of low-hydrogen consumables, and application of pre-heating (per EN 1011) are essential for thicker sections (>30 mm) and restrained joints to prevent hydrogen-induced cracking. 3. **Good Formability:** Suitable for cold bending and forming, though its higher strength requires more force than lower grades like S235. 4. **Proven Reliability:** A globally recognized and trusted material for a vast array of structural applications. **Typical Applications** S355JR is used in a wide range of general structural applications where specific low-temperature toughness is not a design requirement and service temperatures remain above 0°C. * **General Construction:** Beams, columns, bracings, and plates in commercial buildings, industrial halls, and warehouses in temperate climates. * **General Heavy Fabrication:** Machine frames, bases, heavy supports, and non-critical brackets. * **Transportation:** Chassis components for trailers and heavy trucks, structural parts for railway freight cars. * **Storage & Material Handling:** Heavy-duty racking components and shelving systems for indoor use. * **Agricultural & Industrial Machinery:** Frames and structural parts for equipment used in ambient conditions. **Available Forms & Processing** * **Forms:** Hot-rolled plates, sheets, strips, bars (round, flat), and all common structural sections (HEA/HEB beams, IPE beams, channels, angles). * **Surface:** Typically with mill scale. Can be shot blasted or primed upon request. * **Processing:** Suitable for shearing, punching, plasma/laser cutting, drilling, welding (with correct procedure), and cold bending. --- **Critical Selection & Procurement Note** * **Temperature Limitation (Most Important):** The **JR quality is unsuitable for applications where the service temperature can fall below 0°C**, especially under dynamic or impact loads. For such applications, **S355J0 (0°C)** or **S355J2 (-20°C)** must be specified. Using S355JR in cold environments is a common but serious specification error. * **Thickness-Strength Relationship:** The guaranteed minimum yield strength of **355 MPa applies only to thickness ≤ 16 mm**. For thicker material, the minimum yield strength is reduced (e.g., ≥345 MPa for t > 40mm ≤ 63mm). Always use the correct value for the product thickness in design calculations. * **Welding Requires Care:** Do not treat it like S235. The higher CEV demands responsible welding practices. * **Correct Terminology:** **DO NOT use the term "High Manganese Steel."** The correct and only accurate description is **"Non-Alloy Base Structural Steel, Grade S355JR."** * **Specification:** For most purposes, specifying **"S355JR"** is sufficient. It is the base-grade counterpart to the quality grades like S355J0 and S355J2. -:- For detailed product information, please contact sales. -: EN S355JR High Manganese, Structural, Hot Rolled, Base Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5836 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. -: EN S355JR High Manganese, Structural, Hot Rolled, Base Steel Properties -:- For detailed product information, please contact sales. -:

Applications of EN S355JR High Manganese, Structural, Hot Rolled, Base Steel Rod -:- For detailed product information, please contact sales. -: Chemical Identifiers EN S355JR High Manganese, Structural, Hot Rolled, Base Steel Rod -:- For detailed product information, please contact sales. -:

Packing of EN S355JR High Manganese, Structural, Hot Rolled, Base Steel Rod -:- 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 Rod 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 2307 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