EN10025 S460M

The core standard corresponding to the steel pipe grade S460M is the European standard EN 10025-4 (hot mechanical rolled weldable fine-grained structural steel). The following is the detailed description:

• Main standard: EN 10025-4, the latest version is EN 10025-4:2019, which stipulates the production process, chemical composition, mechanical properties and inspection requirements of S460M.

• Naming rule:

1. S: Structural Steel;
2. 460: Minimum yield strength ≥460 MPa (when thickness ≤16mm);
3. M: The delivery condition is Thermo-Mechanical Rolling (TMR/TMCP).

The chemical composition of S460M must meet the following limit values (mass percentage %) :

Note: When used for railway steel, the sulfur content can be negotiated to be reduced to ≤0.010%.

Mechanical properties vary with thickness. The specific requirements are as follows (for transverse specimens) :

Note: The impact energy value is a reference value. The actual standard requires that the longitudinal sample be tested at -20℃. The specific value should be in accordance with the contract agreement.

• Process: Thermal mechanical rolling (TMCP), which refines grains and enhances strength and toughness through controlled rolling and controlled cooling.

• Limitation: If the subsequent processing temperature exceeds 580℃, it may lead to a decrease in strength. Confirmation from the supplier is required.

• European standard steel grade: 1.8827
• American standard approximations: ASTM A913 Gr.65, A572 Gr.65
• German standard approximation: StE460TM
• Japanese standard approximation: JIS SM570.

S460M is widely used in high-stress structures, such as:

• Bridges and Buildings: High-rise load-bearing components, long-span Bridges;
• Machinery and Energy: Port machinery, wind power towers, pressure vessels;
• Transportation: Heavy vehicle chassis, ship structures.

• Thin plate production: For extremely thin specifications with a thickness of 5 to 9mm, special rolling processes are required to avoid deformation defects.

• Impact toughness: S460ML is a low-temperature variant (impact at -50℃), suitable for extremely cold environments.

The core standard of S460M is EN 10025-4:2019. Its high strength, excellent weldability and thermomechanical rolling process make it an ideal choice for heavy-duty structures. In practical applications, it is necessary to strictly follow the composition and performance requirements in the standards, and pay attention to the processing temperature limits. For the complete standard text or test details, please refer to the official documentation of EN 10025-4 or the technical documents of the supplier.

According to the European standard EN 10025-4 (Technical Conditions for Delivery of Hot-rolled weldable fine-grained Structural Steel), the following Steel Grades are specified in this standard, classified by strength grade and low-temperature toughness requirements as follows:

Steel grade classification under EN 10025-4 standard：

 S275M：

• Minimum yield strength: 275 MPa (thickness ≤16mm)
• Impact toughness requirement: Impact energy ≥27J at -20℃ (for longitudinal specimens)
• Applicable temperature: ≥ -20℃ environment
• Typical applications: General building structures, mechanical frames.

 S275ML：

• Impact toughness requirement: Impact energy ≥27J at -50℃ (for longitudinal specimens)
• Applicable temperature: ≥ -50℃ low-temperature environment (such as polar facilities, cryogenic storage tanks).

 S355M：

• Minimum yield strength: 355 MPa (thickness ≤16mm)
• Impact toughness requirement: Impact energy at -20℃ ≥27J
• Typical applications: Bridges, load-bearing structures of high-rise buildings, port machinery.

 S355ML：

• Impact toughness requirement: Impact energy ≥27J at -50℃
• Applicable scenarios: Infrastructure in severely cold regions, wind power towers, and ship structures.

 S420M:

• Minimum yield strength: 420 MPa (thickness ≤16mm)
• Impact toughness requirement: Impact energy at -20℃ ≥27J
• Advantages: A balance of high strength and good weldability, suitable for large-span structures.

 S420ML:

• Impact toughness requirement: Impact energy ≥27J at -50℃
• Application: Cryogenic pressure vessels, key components of offshore platforms.

 S460M:

• Minimum yield strength: 460 MPa (thickness ≤16mm)
• Impact toughness requirement: Impact energy at -20℃ ≥27J
• Features: Ultra-high strength, and carbon equivalent (CEV) control is required to ensure weldability.

S460ML:

• Impact toughness requirement: Impact energy ≥27J at -50℃
• Typical scenarios: Heavy lifting equipment, polar engineering, high-strength welded structures.

1. Delivery status: All steel grades must be produced through the thermal mechanical rolling (TMCP/TMR) process to refine the grain size and optimize strength and toughness.

2. Chemical composition: Strictly control sulfur (S≤0.025%), phosphorus (P≤0.025%), and carbon equivalent (CEV) to ensure weldability and low-temperature toughness.

3. Impact toughness:

• M grade: Impact energy ≥27J at -20℃ (longitudinal specimens)
• ML grade: Impact energy ≥27J at -50℃ (longitudinal sample).

4. Subsequent processing restrictions: If the usage temperature exceeds 580℃, the supplier must confirm the strength stability.

• American standard ASTM: S355M ≈ ASTM A572 Gr.50, S460M ≈ ASTM A913 Gr.65.

• Japanese standard JIS: S355M ≈ SM570, S460M ≈ SHY685.

The EN 10025-4 standard covers eight steel grades, which are divided into four strength grades: S275, S355, S420, and S460, each containing two toughness subcategories: M (-20℃) and ML (-50℃). Its core advantage lies in the combination of high strength and excellent low-temperature toughness achieved through the thermomechanical rolling process, making it suitable for welded heavy-duty structures and harsh environmental engineering. When selecting the type, a comprehensive assessment should be made based on the design temperature, load requirements and welding process.