EN S235J2G4 High Manganese, Quality Steel Rod/Bar

EN S235J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Rod Product Information -:- For detailed product information, please contact sales. -: EN S235J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Rod Synonyms -:- For detailed product information, please contact sales. -:

EN S235J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Product Information -:- For detailed product information, please contact sales. -: **Product Name:** EN S235J2G4 Structural Steel, Hot Rolled, Thermomechanically Rolled **Overview:** EN S235J2G4 is a **non-alloy structural steel** belonging to the S235 strength category, defined under the European standard EN 10025-2. This grade is distinguished by its specific **processing route and guaranteed low-temperature toughness**. The suffix **"G4"** indicates the steel is supplied in the **thermomechanically rolled (TM) condition**, a controlled rolling process that refines the grain structure to enhance toughness and strength without a separate heat treatment. Combined with the **"J2"** quality requirement for impact testing at **-20°C**, S235J2G4 is engineered for structural applications demanding good toughness in cold environments and consistent mechanical properties. It is **not a "High Manganese" steel**; its key characteristic is its thermomechanical processing. **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 & Condition Designation:** **S235J2G4** * **S:** Structural Steel. * **235:** Minimum yield strength in MPa (for nominal thickness ≤ 16mm). * **J2:** Quality designation, guaranteeing impact energy testing at **-20°C**. * **G4:** Supplementary designation for the **delivery condition**. "G4" specifically means the product is supplied in the **thermomechanically rolled (TM) condition**. * **Clarification on "High Manganese":** This is a misclassification. S235J2G4 is a **standard non-alloy quality steel**. Its defining feature is the **thermomechanical rolling process (G4)**, not an elevated manganese content. Its composition is typical for S235 grades. * **Equivalents & Context:** The "G4" (TM) condition is analogous to the processing used for many modern high-strength low-alloy (HSLA) steels, though S235J2G4 itself remains a non-alloy grade. There is no direct ASTM equivalent that combines this specific strength, toughness, and TM processing in a single designation. **Chemical Composition (Ladle Analysis, % by weight, maximum values per EN 10025-2):** Standard S235 composition, suitable for TM processing. * **Carbon (C):** ≤ **0.17%** (Low for good weldability and toughness). * **Manganese (Mn):** ≤ **1.40%** (Standard range). * **Phosphorus (P):** ≤ **0.035%**. * **Sulphur (S):** ≤ **0.035%**. * **Nitrogen (N):** Typically controlled, often through microalloying or killing practice to aid TM process. * **Microalloys (Nb, V, Ti):** May be added in very small amounts (e.g., Nb ≤ 0.05%) to inhibit grain growth and enhance the effect of thermomechanical rolling, promoting a fine-grained structure. **Physical & Mechanical Properties (for thermomechanically rolled 'G4' condition, thickness ≤ 16mm):** The TM process results in a fine, elongated grain structure that improves toughness. * **Yield Strength (ReH):** ≥ **235 MPa** (Minimum, thickness-dependent. TM rolling may lead to a higher yield strength compared to the same grade in as-rolled condition, offering a potential strength reserve). * **Tensile Strength (Rm):** **360 - 510 MPa**. * **Elongation at Break (A5):** ≥ **26%** (Minimum, longitudinal test piece). * **Impact Energy (KV):** **≥ 27 J at -20°C** (Longitudinal, Charpy V-notch). The fine grain from TM rolling ensures good low-temperature toughness. * **Microstructure:** Fine-grained ferrite-pearlite structure with possibly a slight directional property due to the rolling deformation. * **Density:** **~7.85 g/cm³**. * **Modulus of Elasticity:** **210 GPa**. **Product Features:** 1. **Enhanced Toughness via TM Process (G4):** Thermomechanical rolling produces a finer grain size than conventional hot rolling, resulting in superior toughness and a better strength-toughness combination at the same strength level. This is its primary advantage over as-rolled (AR) S235J2. 2. **Guaranteed Low-Temperature Toughness:** The **J2** quality ensures reliable performance for structures exposed to temperatures as low as **-20°C**. 3. **Good Weldability (with caution):** While still easily weldable due to low carbon, the TM condition can be sensitive to high heat input during welding, which can coarsen the fine-grained microstructure in the heat-affected zone (HAZ). Controlled welding procedures are recommended. 4. **No Separate Heat Treatment:** The properties are achieved during the rolling process, making it energy-efficient compared to normalized (G3) steels. **Typical Applications:** S235J2G4 is used where the combination of guaranteed -20°C toughness and the benefits of a modern TM rolling process are valued, often for critical but non-heavy sections. * **Structural Sections & Tubes:** **Hollow sections, tubes, and profiles** used in exposed structures like lighting masts, sign gantries, and light bridges in cold climates. * **Vehicle & Transport Construction:** **Chassis components, trailer frames, and structural parts** for vehicles operating in temperate to cold regions. * **Material Handling Equipment:** Components for **cranes, conveyor supports, and access platforms** where low-temperature toughness is specified. * **General Engineering:** Critical brackets, supports, and frames where the consistent properties from TM rolling are beneficial for fabrication. **Available Forms & Processing:** * **Forms:** Commonly supplied as **thermomechanically rolled plates, strips, and sections**. The TM process is particularly effective and common for thinner gauges and hollow sections. * **Surface:** Typically with the mill scale from the final rolling pass. * **Processing:** Good for cutting and cold forming. **Welding requires attention to heat input** to preserve HAZ toughness. Post-weld heat treatment is generally not required but should be evaluated for thick sections. --- **Procurement & Specification Note:** Specifying **"S235J2G4"** is essential to obtain the thermomechanically rolled product. Omitting "G4" will result in supply of standard as-rolled S235J2. The term **"High Manganese" is incorrect and should not be used**. This grade's value proposition lies in the **improved toughness and consistency provided by the thermomechanical rolling process (G4)**. For applications requiring even higher strength with similar processing, grades like **S355M** (thermomechanically rolled, yield ≥355 MPa) should be considered. Mechanical properties are thickness-dependent. -:- For detailed product information, please contact sales. -: EN S235J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5809 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 S235J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Properties -:- For detailed product information, please contact sales. -:

Applications of EN S235J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Rod -:- For detailed product information, please contact sales. -: Chemical Identifiers EN S235J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Rod -:- For detailed product information, please contact sales. -:

Packing of EN S235J2G4 High Manganese, Structural, Hot Rolled, Quality 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 2280 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