15Mo3 Boiler Pressure Vessel Steel for High-Temperature Applications

15Mo3 Boiler Pressure Vessel Steel Description

15Mo3 Pressure Vessel Steel is a low-alloy steel specifically designed for high-temperature applications, primarily in boiler and pressure vessel manufacturing. Standardized under the German DIN 17155 specification, 15Mo3 Boiler Pressure Vessel Steel is renowned for its ability to withstand elevated temperatures and moderate pressures, making it a critical material in industries requiring robust, heat-resistant components. This molybdenum-alloyed steel offers a balance of strength, ductility, and corrosion resistance, ensuring reliable performance in demanding environments. Unlike standard carbon steels, DIN 17155 15Mo3 boiler steel includes molybdenum, which enhances its creep resistance and thermal stability, positioning it as a preferred choice for specialized industrial applications.

15Mo3 Boiler Pressure Vessel Steel is widely utilized in industries where equipment operates under high temperatures and pressures. DIN 17155 15Mo3 boiler steel is commonly used in the fabrication of steam boilers, pressure vessels, heat exchangers, and piping systems for the oil, gas, and chemical sectors. Its ability to resist thermal fatigue and creep makes it ideal for components like vaporizer tubes, collector tubes, and flanges in power generation plants. Additionally, 15Mo3 Boiler Pressure Vessel Steel is employed in petrochemical reactors and other high-temperature processing equipment, where its weldability and corrosion resistance ensure long-term reliability and safety.

15Mo3 Boiler Pressure Vessel Steel Datasheet

15Mo3 Pressure Vessel Steel is available in a range of dimensions to suit different manufacturing needs.
Plates and sheets of DIN 17155 15Mo3 boiler steel are typically offered in thicknesses ranging from 6 mm to 150 mm, with widths up to 3000 mm and lengths up to 12000 mm.
For seamless tubes, common outer diameters range from 10.2 mm to 711 mm, with wall thicknesses between 1.6 mm and 100 mm, as specified in standards like DIN 17175.
Custom dimensions can be produced based on project requirements, and 15Mo3 Boiler Pressure Vessel Steel can be supplied in hot-rolled, normalized, or quenched-and-tempered conditions to meet specific application needs.

15Mo3 Boiler Pressure Vessel Steel Chemical composition

The chemical composition of 15Mo3 Pressure Vessel Steel is carefully engineered to provide optimal performance in high-temperature settings. The addition of molybdenum and controlled levels of carbon, manganese, and other elements ensure the material’s strength and durability. Below is a detailed breakdown of the chemical composition of DIN 17155 15Mo3 boiler steel:

Element	Composition (% Max, unless stated)
Carbon (C)	0.12 - 0.20
Manganese (Mn)	0.40 - 0.90
Phosphorus (P)	0.025
Sulfur (S)	0.010
Silicon (Si)	0.35
Molybdenum (Mo)	0.25 - 0.35
Chromium (Cr)	0.30

This composition ensures that 15Mo3 Boiler Pressure Vessel Steel maintains its structural properties under thermal stress, with low sulfur and phosphorus levels minimizing the risk of embrittlement.

15Mo3 Boiler Pressure Vessel Steel Mechanical Properties

The mechanical properties of 15Mo3 Pressure Vessel Steel make it suitable for demanding applications requiring both strength and flexibility. DIN 17155 15Mo3 boiler steel is typically delivered in a normalized condition, which enhances its grain structure and mechanical performance. The following table outlines the key mechanical properties:

Property	Value
Yield Strength (MPa)	220 - 275
Tensile Strength (MPa)	440 - 590
Elongation (%)	≥ 20
Impact Energy (Charpy V-notch, J)	≥ 31 (at 20°C)
Hardness (HB)	130 - 170 (approximate)

These properties ensure that 15Mo3 Boiler Pressure Vessel Steel can endure high-pressure environments while maintaining ductility and toughness, critical for applications like boiler tubes and pressure vessel shells.

Equivalent Grade of 15Mo3 Boiler Pressure Vessel Steel

15Mo3 Pressure Vessel Steel has been largely superseded by the European standard EN 10028, with 16Mo3 being its closest modern equivalent. However, several other standards reference materials with similar properties. The table below lists equivalent materials for DIN 17155 15Mo3 boiler steel:

Standard	Equivalent Grade
EN 10028	16Mo3
ASTM	A204 Grade B
UNI 5869	15Mo3
NFA 36-205	15D3
JIS G3115	SB46M
ISO	P26

These equivalent grades allow engineers and manufacturers to source comparable materials globally, ensuring compatibility with 15Mo3 Boiler Pressure Vessel Steel in various applications.