Shanghai, September 12, 2025, 07:10 AM PDT – SHH STEEL, a steel industry leader, compares two widely used steel grades, ASTM A516 Gr.70 and EN 10028-2 P355GH, to guide buyers in selecting optimal materials for pressure vessels, boilers, and structural applications. Both grades are carbon steels designed for elevated temperatures, but their properties and standards differ, impacting performance.
| Parameter | ASTM A516 Gr.70 | EN 10028-2 P355GH |
| Standard | ASTM A516/A516M-17 | EN 10028-2:2009 |
| Yield Strength (MPa) | 260 (min) | 355 (min) |
| Tensile Strength (MPa) | 485-620 | 490-630 |
| Elongation (%) | 17 (min) | 22 (min) |
| Impact Test (°C/J) | 27J @ -20°C | 34J @ -20°C |
| Thickness Range (mm) | 6-200 | 6-250 |
Mechanical Properties Comparison A516 Gr.70, a U.S. standard, offers a minimum yield of 260 MPa and tensile strength of 485-620 MPa, suitable for moderate-pressure vessels. P355GH, a European grade, provides a higher yield of 355 MPa and tensile of 490-630 MPa, designed for elevated temperatures up to 400°C. SHH STEEL’s testing data shows P355GH’s 22% elongation exceeds A516’s 17%, indicating better ductility for complex shapes.
| Test Condition | A516 Gr.70 Result | P355GH Result | Implication |
| Tensile Strength (MPa) | 510 | 520 | P355GH slightly stronger |
| Yield Strength (MPa) | 270 | 360 | P355GH better for stress |
| Elongation (%) | 18 | 23 | P355GH more ductile |
| Hardness (HB)** | 150-180 | 140-170 | A516 slightly harder |
Chemical Composition Limits Alloying elements influence performance:
| Element (%) | ASTM A516 Gr.70 | EN 10028-2 P355GH |
| Carbon (C) | 0.27 max | 0.20 max |
| Manganese (Mn) | 0.85-1.20 | 1.10-1.70 |
| Phosphorus (P) | 0.035 max | 0.025 max |
| Sulfur (S) | 0.035 max | 0.015 max |
| Silicon (Si) | 0.15-0.40 | 0.40 max |
Interpretation: P355GH’s lower sulfur (0.015%) and higher manganese (1.10-1.70%) improve weldability and toughness over A516’s 0.035% sulfur. A516’s 0.27% carbon limit suits general use, while P355GH’s 0.20% enhances high-temperature stability. SHH STEEL recommends P355GH for EU boilers and A516 for U.S. vessels.
Heat Treatment Requirements
| Heat Treatment | A516 Gr.70 Temp (°C) | P355GH Temp (°C) | Purpose | SHH STEEL Testing |
| Normalization | 900-950 | 880-950 | Grain refinement | ASTM E112 grain size |
| Stress Relief | 620-650 | 580-620 | Residual stress reduction | ASME SA-20 |
Application Suitability
| Application | A516 Gr.70 Advantage | P355GH Advantage | SHH STEEL Recommendation |
| Pressure Vessels | Higher thickness range | Better ductility | A516 for U.S., P355GH for EU |
| Boilers | Cost-effective | High-temp stability | P355GH for 400°C+ |
| Structural Use | Versatile grades | Stricter compliance | A516 for general, P355GH for critical |
SHH STEEL’s in-house lab (ASTM E8, ISO 6892-1) validates these properties, ensuring buyers select the right grade for their projects.
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