EN 10028-2 Grade 20MnMoNi4-5 quenched and tempered (+QT)

EN 10028-2 Grade 20MnMoNi4-5 quenched and tempered (+QT)

EN 10028-2 is a European standard that provides specifications for flat products made of pressure vessel steels. The standard specifies the requirements for steel grades used in the fabrication of pressure vessels, boilers, and heat exchangers. It covers various grades of non-alloy and alloy steels that are intended for elevated temperature service.

The standard defines the chemical composition, mechanical properties, and other relevant characteristics of the steel grades. It sets out the requirements for dimensions, tolerances, testing methods, and certification procedures. EN 10028-2 includes information on steel plates and sheets, as well as strip materials.

This standard is important in ensuring the safety and reliability of pressure equipment by specifying the quality and performance criteria for the materials used in their construction. It is widely recognized and adopted in Europe and other parts of the world as a benchmark for pressure vessel steel specifications.

EN 10028-2 Grade 20MnMoNi4-5 is a pressure vessel steel that belongs to the non-alloy and alloy steels specified in EN 10028-2. Here are the details regarding its chemical composition, mechanical properties, and typical applications:

20MnMoNi4-5 chemical composition (weight percent):
Carbon (C): ≤0.22%
Manganese (Mn): 1.10-1.80%
Phosphorus (P): ≤0.025%
Sulfur (S): ≤0.010%
Silicon (Si): ≤0.60%
Chromium (Cr): ≤0.30%
Molybdenum (Mo): 0.40-0.70%
Nickel (Ni): 0.50-0.80%

20MnMoNi4-5 mechanical properties (minimum value at ambient temperature):
Yield strength (Rp0.2): ≥355 MPa
Tensile strength (Rm): 510-650 MPa
Elongation (A): ≥22%
Impact energy (KV): ≥27 J at -20°C

Typical uses of 20MnMoNi4-5:
EN 10028-2 grade 20MnMoNi4-5 is commonly used in the manufacture of pressure vessels and boilers in high temperature environments. It has good mechanical properties, high creep resistance and excellent toughness, making it suitable for demanding applications under high temperature and pressure conditions.

EN 10028-2 Grade 20MnMoNi4-5 quenched and tempered (+QT) refers to the steel grade 20MnMoNi4-5 that has undergone a process of quenching and tempering. Quenching involves rapidly cooling the steel from a high temperature to enhance its hardness, while tempering is a subsequent heating process to improve its toughness and reduce brittleness.

The specific details regarding the mechanical properties of EN 10028-2 Grade 20MnMoNi4-5 in the quenched and tempered condition may vary depending on the specific heat treatment parameters used. Generally, quenched and tempered steels exhibit improved strength, hardness, and toughness compared to their normalized counterparts.

It's important to note that the exact mechanical properties of Grade 20MnMoNi4-5 in the quenched and tempered condition can be obtained from material datasheets or by referring to the specific heat treatment specifications provided by the steel manufacturer. These specifications will outline the recommended quenching media, tempering temperature, holding time, and subsequent testing requirements for the specific grade.