EN10028-2 1.5415 18MnMo4-5 Alloy Steel

EN10028-2 1.5415 18MnMo4-5 Alloy Steel Description

EN10028-2 1.5415 steel, known as 18MnMo4-5, is a high-performance molybdenum-alloyed steel designed for pressure vessel applications under elevated temperatures. Specified under the European standard EN10028-2, this weldable steel is valued for its exceptional strength, heat resistance, and corrosion resistance.

EN10028-2 1.5415 steel properties make 18MnMo4-5 a standout choice for demanding industrial applications. Engineered to perform at temperatures up to 500°C, this steel exhibits excellent resistance to creep, oxidation, and corrosion, particularly in steam or chemically aggressive settings. Its higher manganese and molybdenum content compared to similar grades like 16Mo3 enhances its strength and thermal stability. The normalized or normalized-and-tempered microstructure ensures superior toughness and ductility, while its weldability supports complex fabrications for pressure vessels and boilers.

The 18MnMo4-5 pressure vessel steel is tailored for high-pressure, high-temperature conditions, offering greater strength than standard carbon steels. Its ability to maintain structural integrity under prolonged thermal exposure makes it ideal for critical infrastructure, providing a balance of performance and cost-effectiveness. The 18MnMo4-5 steel benefits include its versatility and reliability, making it a preferred material in energy and petrochemical industries.

EN10028-2 1.5415 18MnMo4-5 Alloy Steel Datasheet

Thickness: 6-50mm
Width: 1000-3000mm
Length: 6000-12000mm
Tolerance: ±1mm
Surface treatment: hot rolled or sandblasted surfaces, some of which can be pickled or coated as required.

EN10028-2 1.5415 18MnMo4-5 Alloy Steel Chemical composition

The 18MnMo4-5 chemical composition is optimized for high-temperature performance and weldability. According to EN10028-2, the typical composition of 1.5415 steel includes:
 

This composition ensures that EN10028-2 18MnMo4-5 steel delivers robust performance in harsh environments. The elevated manganese and molybdenum levels provide superior strength and creep resistance, while low phosphorus and sulfur content enhances weldability, reducing the risk of fabrication defects.

EN10028-2 1.5415 18MnMo4-5 Alloy Steel Mechanical Properties

The 18MnMo4-5 mechanical properties are designed for pressure vessel applications. Typically normalized or normalized-and-tempered at 870–930°C, 1.5415 steel offers a balanced combination of strength, ductility, and toughness. Key mechanical properties include:

• Yield Strength: 290–390 MPa (depending on thickness and heat treatment).

• Tensile Strength: 470–620 MPa.

• Elongation: ≥20%, ensuring good ductility.

• Impact Toughness: Excellent at ambient and elevated temperatures.

• Hardness: Approximately 150–190 HB, suitable for high-pressure systems.

The EN10028-2 1.5415 steel physical performance is enhanced by its thermal properties. With a thermal conductivity of ~34 W/m·K and a specific heat capacity of ~460 J/kg·K, 18MnMo4-5 efficiently manages heat transfer in applications like heat exchangers. Its thermal expansion coefficient (~12.5 µm/m·K) ensures dimensional stability under temperature fluctuations, minimizing distortion in critical components.

Equivalent Grade of EN10028-2 1.5415 18MnMo4-5 Alloy Steel

Understanding 18MnMo4-5 equivalent materials is essential for global sourcing and substitution. EN10028-2 1.5415 steel aligns with several international standards, including:

• ASTM/ASME: A204 Grade C (USA) – Similar molybdenum content and high-temperature properties.

• DIN: Limited direct equivalents, but comparable to some creep-resistant grades.

• BS: 1501-620 (UK) – A close match for pressure vessel applications.

• JIS: STBA 20 (Japan) – Used in similar high-temperature environments.

• GOST: 15M (Russia) – A comparable grade for boiler components.

These EN10028-2 1.5415 equivalent grades provide flexibility for manufacturers, though variations in composition or heat treatment may require verification to ensure performance alignment.