How Much Do You Know About 16Mo3 Alloy Steel Plates for Low-Temperature Pressure Vessels

First, the Material Characteristics and Standard Definitions of 16Mo3 Alloy Steel Plates

16Mo3 is a low-alloy chromium-molybdenum steel conforming to European standard EN10028-2. The name 16Mo3 alloy steel plate derives from its chemical composition, which contains approximately 0.16% carbon and 0.3% molybdenum. The addition of molybdenum significantly enhances the thermal strength and creep resistance of 16Mo3 alloy steel plates, making them suitable for low-temperature, high-pressure environments (350-550℃). This makes them an ideal choice for pressure vessels, boiler piping, and other applications. Key characteristics of 16Mo3 alloy steel plates include:

High Temperature Resistance: 16Mo3 alloy steel plates can operate stably for extended periods below 400℃, making them suitable for high-temperature steam and fluid environments.

Corrosion Resistance: The high molybdenum content enhances the steel plate's corrosion resistance in acidic or hydrogen sulfide-containing media.

Mechanical Properties: 16Mo3 alloy steel plate has a tensile strength of 440-590 MPa, a yield strength of≥260 MPa, and an elongation after fracture of≥22%, exhibiting both high strength and good toughness.

Second, the chemical composition and mechanical properties of 16Mo3 alloy steel plate:

Carbon content ranges from 0.12-0.20%. Its function is to increase strength, but excessive amounts will reduce toughness.

Silicon content ranges from ≤0.35%. Its function is as a deoxidizer, increasing strength.

Manganese content ranges from 0.40-0.90%. Its function is as a hardenability element, affecting weld toughness.

Phosphorus content ranges from ≤0.025%. Its function is as an impurity element, requiring strict control.

Sulfur content ranges from ≤0.010%. Its function is as an impurity element, requiring strict control.

Molybdenum content ranges from 0.25-0.35%. Its function is as a core element, improving hot strength.

Chromium content ranges from 0.70-1.15%. Its function is to enhance corrosion resistance.

Mechanical properties of 16Mo3 alloy steel plate:

Yield strength: ≥260 MPa (≥275 MPa when thickness ≤16mm)

Tensile strength: 440-590 MPa

Elongation after fracture: ≥22% (gauge length 50mm)

Impact toughness: ≥27 J at room temperature, ≥31 J at -20℃

Third, the heat treatment and welding process of the 16Mo3 alloy steel plate

Heat treatment of 16Mo3 alloy steel plate:

The delivery condition of 16Mo3 alloy steel plate is mainly normalized (N) or normalized + tempered (N+T). Normalized delivery is preferred for thicknesses ≤120mm.

Normalizing temperature: 890-950℃, tempering temperature: 680-730℃, aiming to refine grains, homogenize the microstructure, and eliminate internal stress.

Welding process of 16Mo3 alloy steel plate:

Preheating temperature: 150-200℃, to prevent cold cracking.

Welding Method: Low-hydrogen electrodes (such as E7015) are recommended to control the risk of hydrogen-induced cracking.

Post-weld Treatment: Hold the weld at room temperature for 30 minutes, then heat to 250-300℃ (within 100mm on both sides) and slowly cool for ≥2 hours to eliminate residual stress.

Welding Contraindications: Avoid manganese content >3% (leading to brittleness). A manganese content of 0.6-1.8% balances strength and toughness.

Fourth, Application Areas of 16Mo3 Alloy Steel Plates:

Power Plant Boilers: 16Mo3 alloy steel plates are used to manufacture high-temperature components such as superheater headers and main steam pipes, which withstand long-term operating temperatures of approximately 540℃.

Nuclear Power Equipment: 16Mo3 alloy steel plates are used for pressure boundary components in auxiliary systems, such as heat transfer tubes in steam generators.

Hydrogenation Reactors and Catalytic Cracking Units: 16Mo3 alloy steel plates are used for high-temperature pipelines and pressure vessels, resistant to corrosive media such as hydrogen sulfide.

Steam turbine casings and industrial furnace components: 16Mo3 alloy steel plates are commonly used in engineering structures requiring resistance to moderate temperatures and pressures.

Gas and steam pipelines: 16Mo3 alloy steel plates are used in pipelines transporting high-temperature fluids, such as gas and steam.

Fifth, Product Advantages and Market Evaluation of 16Mo3 Alloy Steel Plates

Quality Assurance: Strictly adheres to EN10028-2 standards; chemical composition and mechanical properties meet international specifications.

Provides third-party inspection certificates, supports factory-witnessed testing, and on-site supervision to ensure reliable quality.

Complete Specifications:

Thickness Range: Standard 8-60mm, customizable to 80mm or higher.

Width/Length: Standard 2200-2500mm wide, 8000-12000mm long, customization supported.

Flaw Detection Requirements: Optional NB/T 47013 standard levels (I-III) to ensure no internal defects.

Market feedback: User reviews indicate that 16Mo3 alloy steel plates offer stable quality and reliable performance, meeting the stringent requirements of high-temperature and high-pressure operating conditions.

They are widely used in energy, petrochemical, and heavy machinery industries, and are one of the preferred materials for manufacturing boilers, pressure vessels, and other equipment.