ASTM A516 Grade 70 vs. European Equivalent P355GH: A Technical Comparison for Pressure Vessel Applications
When sourcing carbon steel plates for pressure vessels and boilers, engineers and procurement specialists often face a critical question: What is the European equivalent of ASTM A516 Grade 70? The direct answer is EN 10028-2 P355GH . However, while these two grades are frequently cross-referenced, they are not identical. Understanding the subtle but significant differences in standards, mechanical properties, and environmental suitability is key to optimizing both safety and cost.
This article provides an in-depth, technical comparison between ASTM A516 Grade 70 (ASME SA516 Gr 70) and its European "equivalent," P355GH, highlighting the specific advantages of the American standard in certain operating conditions.
The A516GR70 Advantage
Controlled Purity for Sour Service:
ASTM A516 Grade 70 is often readily available with optional supplemental requirements such as HIC (Hydrogen Induced Cracking) testing and NACE MR0175 compliance for sour gas environments . While P355GH generally has lower impurities (P ≤ 0.025%, S ≤ 0.015%) in its standard melt , the A516 supply chain is heavily geared toward the oil and gas sector, making it easier to source with strict HIC/SSC certifications without long lead times.
| Property | ASTM A516 Grade 70 | EN 10028-2 P355GH |
|---|---|---|
| Tensile Strength | 485 – 620 MPa | 510 – 650 MPa |
| Yield Strength (≤16mm) | ≥ 260 MPa | ≥ 355 MPa |
| Elongation | 21% (in 2 inches) | 20% (Minimum) |
| Impact Test Temp | -46°C (-50°F) Typical | -20°C (Standard) |
| Max Service Temp | ~425°C (800°F) | ~500°C (930°F) |
Standard Specifications and Design Intent
ASTM A516 Grade 70 (ASME SA516 Gr 70)
Standard: ASTM A516 / ASME SA516.
Title: Standard Specification for Pressure Vessel Plates, Carbon Steel, for Moderate- and Lower-Temperature Service .
Key Focus: Optimized for notch toughness and resistance to brittle fracture at low ambient temperatures .
ASME Boiler Code: SA516 is specifically approved for use under the ASME Boiler and Pressure Vessel Code (BPVC), which is mandatory in North America and recognized globally .
Standard: EN 10028-2.
Title: Flat products made of steels for pressure purposes – Part 2: Non-alloy and alloy steels with specified elevated temperature properties .
Key Focus: Designed for high-temperature service (creep resistance) and pressure parts operating in the creep range .
Critical Takeaway: A516 Gr 70 is a "Low-Temperature" steel, while P355GH is an "Elevated-Temperature" steel.
Application Scenarios: Where to Use Which?
Choose ASTM A516 Grade 70 When
Design Temperature is below -20°C: Storage tanks for refrigerated gases, cryogenic services, or winterized equipment in Canada/Russia.
ASME Code Stamp is Required: For vessels being exported to the US or Canada, ASME SA516 is mandatory. EN P355GH does not automatically qualify for ASME stamping .
Sour Service (Wet H₂S): The standard availability of HIC tested plates makes A516 Gr 70 a preferred choice for the oil and gas industry
Choose EN P355GH When
Operating Temperature exceeds 450°C: P355GH offers better creep resistance and oxidation stability at very high temperatures .
Project is strictly in the EU/CE Market: To comply with the Pressure Equipment Directive (PED), using EN standards is the path of least resistance.
Weight Reduction is Critical: The higher yield strength (355 MPa) allows designers to use slightly thinner plates for the same pressure, reducing overall weight
Conclusion
While P355GH is the official "European equivalent" of ASTM A516 Grade 70, they are not 100% interchangeable.
ASTM A516 Gr 70 retains a distinct competitive advantage in low-temperature toughness and sour service compliance. For global projects involving fluctuating climates or aggressive media (H₂S), A516 Gr 70 is the superior, safer bet. Conversely, for static, high-temperature heat exchangers within Europe, P355GH is the economical standard.
who choose us?
1. Genuine ASME Material, Not Just "Equivalents"
We supply certified ASTM A516 Grade 70 with full mill traceability. No cross-labeled P355GH that might fail your inspection.
2. Guaranteed Low-Temperature Performance (-46°C)
Our A516 Gr 70 includes Charpy impact testing at -46°C as standard. P355GH is only guaranteed at -20°C – a critical advantage for cold-climate projects.
3. Ready Stock & Fast Delivery
We maintain thicknesses from 6mm to 150mm in stock, ready to ship. No 8–12 week mill lead times.
4. Global Compliance Support (PED / ASME / NACE)
We provide EN 10204 Type 3.1/3.2 certificates and work with TÜV, BV, or SGS. We handle paperwork so you pass customs and project audits without delays.
one-stop solution
professional team
high quality
Choose YUXIN steel group, and what you purchase is not merely the steel plates, but also a complete warranty system and a sense of responsibility.
Our address
Tianjin, China
Phone Number
(86)-15937221771(WeChat)
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info@chinasteelcompany.com
FAQ
01.Why choose you over a local European P355GH supplier?
02.Can you supply A516 Gr 70 for European PED-certified projects?
03.Is your A516 Gr 70 more expensive than P355GH?
04.What if I need sour service (H₂S) resistance?
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Through years of understanding and precipitation of steel, Yuxin Group has now become a mature steel processing and manufacturer, providing various products for many construction companies and steel structure companies around the world. Thanks to Yuxin Group's professionalism and integrity, it has become a world-renowned enterprise.
