16MnDR is a low-alloy high-strength steel specifically engineered for cryogenic pressure vessel applications. Compliant with GB/T 3531-2014 (China) and internationally recognized, this grade excels in environments demanding exceptional low-temperature toughness, weldability, and resistance to hydrogen-induced cracking.

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Chemical Composition

The controlled alloy design ensures balanced strength and ductility:

• Carbon (C): ≤0.20% (optimized to minimize brittleness while maintaining strength).
• Manganese (Mn): 1.20–1.60% (primary strengthening element, enhances hardenability and low-temperature performance).
• Silicon (Si): 0.15–0.50% (improves deoxidation and solid-solution strengthening).
• Phosphorus (P): ≤0.025%, Sulfur (S): ≤0.012% (strictly limited to reduce segregation and embrittlement).
• Optional Microalloys: Niobium (Nb), Vanadium (V), or Nickel (Ni) may be added to refine grain structure and enhance hydrogen resistance.

Mechanical Properties

16MnDR exhibits robust performance across varying thicknesses and temperatures:

• Tensile Strength (Rm): 440–620 MPa (dependent on thickness and heat treatment).
• Yield Strength (ReL):
  • 6–16mm: ≥315 MPa
  • 16–36mm: ≥295 MPa
  • 36–60mm: ≥285 MPa
  • 60–100mm: ≥275 MPa
  • 100–120mm: ≥265 MPa
• Elongation (A): ≥21% (ensures ductility under deformation).
• Low-Temperature Toughness:
  • -40°C Charpy V-Notch Impact: ≥47J (critical for cryogenic integrity).
  • Bend Test: Passes 180° bending (diameter 2a–3a based on thickness).

Applications

16MnDR is pivotal in industries requiring reliability under extreme conditions:

• Energy & Petrochemical:
  • LNG storage tanks (-162°C), hydrogenation reactors, cryogenic pipelines.
  • Offshore platforms and subsea equipment (resists marine corrosion).
• Power & Nuclear: Pressure vessels for nuclear reactors, boiler components.
• Chemical Processing: Reactors for acetic acid, sulfuric acid, and chlorine derivatives.
• Aerospace & Shipbuilding: Structural components for cryogenic fuel tanks and marine vessels.

Global Equivalent Grades

16MnDR aligns with international standards for cross-border engineering projects:

SA516 Gr.70 - ASTM A516/A516M

P355GH - EN 10028-2

SLCMN440 - JIS G3115

P355NH - ISO 9328-2

Advantages

• Cost-Effective: Superior performance-to-cost ratio compared to high-nickel alloys.
• Weldability: Compatible with SMAW, SAW, and GTAW processes; preheating optional for thin sections.
• Certifications: Complies with ASME, PED, and GB/T 713 for global regulatory compliance.

Technical Support

Our solutions include:

• Custom processing (plates up to 200mm thickness, 4100mm width).
• HIC/SSCC testing and Z-directional property enhancement.
• Expedited delivery (15-day lead time for standard orders).

For project-specific requirements or material certifications, consult our engineering team to ensure optimal performance.