ASTM A612 / ASME SA612 is normalized C-Mn-Si killed steel plate produced to US standards for welded pressure vessel service at moderate and low temperatures.This grade is specified for manufacturing welded pressure vessels, boiler parts, storage tanks and heat exchangers.The material provides consistent weldability, low-temperature notch toughness and defined high tensile strength range.
GNEE Steel is a leading pressure vessel steel plate manufacturer and global supplier of ASTM A612 steel plate, with decades of experience serving pressure vessel builders, boiler fabricators, and energy sector clients worldwide. We specialize in sourcing, certifying, and exporting boiler container plate, low temperature pressure vessel steel, and steel plate for pressure vessel applications across ASME, EN, GB, and JIS standards.
The most direct equivalence relationship: ASTM A612 and ASME SA612
SA-612 grade shall be adopted if ASME certification is required for the project, while ASTM A612 is used for general applications under ASTM specifications. Both grades feature a minimum yield strength of 345 MPa (50 ksi) and a tensile strength range of 560–725 MPa (81–105 ksi).
| Item | ASTM A612 | ASME SA612 |
|---|---|---|
| Issuing Organization | ASTM (American Society for Testing and Materials) | ASME (American Society of Mechanical Engineers) |
| Applicable Standard | ASTM A612/A612M | ASME BPVC Section VIII |
| Material Composition | Identical | Identical |
| Application Scenario | General projects following ASTM standards | Pressure vessel projects requiring ASME certification |
SA612 / A612 Equivalent Grades by International Standards
1.European Standards (EN/DIN)
Within European standards, the most widely recognized equivalent grade to A612 is EN 10028-3 P355N. In addition, EN 10028-2 P355GH is also commonly regarded as an equivalent grade.
| Grade | Standard | Minimum Yield Strength | Characteristics |
|---|---|---|---|
| P355N | EN 10028-3 | ≥355 MPa | Normalized weldable fine-grain steel, the preferred equivalent grade for European projects |
| P355GH | EN 10028-2 | ≥355 MPa | Steel for high-temperature pressure vessels, widely accepted in European and international projects |
| P460N / P460NL1 | EN 10028-3 | ≥460 MPa | High-strength alternative; P460NL1 features superior low-temperature toughness down to -50°C |
Old DIN grades such as HII and 19Mn6 occasionally appear in historical documents, yet they have now been largely superseded by the EN 10028 series.
2.Chinese Standards (GB)
Within China's standard system, the most commonly equivalent grade to A612 is Q345R per GB 713. Besides, 16MnDR (GB/T 3531) is also frequently referenced.
| Grade | Standard | Minimum Yield Strength | Characteristics |
|---|---|---|---|
| Q345R | GB 713 | ≥345 MPa | The most widely used steel for medium & low temperature pressure vessels in China |
| Q345R-NL | GB 713 | ≥345 MPa | Q345R with mandatory low-temperature impact toughness requirements |
| 16MnDR | GB/T 3531 | ≥315 MPa | Steel for low-temperature pressure vessels |
Q345R has the closest strength grade matching A612. It is extensively adopted in domestic pressure vessel fabrication, with similar operating temperature and pressure service conditions to A612. However, critical distinctions exist between the two materials regarding their low-temperature impact toughness requirements.
3.Japanese Standards (JIS)
Under Japanese JIS standards, the primary equivalent grade for A612 is SPV355 specified in JIS G3115.
| Grade | Standard | Minimum Yield Strength | Characteristics |
|---|---|---|---|
| SPV355 | JIS G3115 | ≥355 MPa | Steel for pressure vessels; functionally equivalent grade under Japanese industrial codes |
| SM53B / SM53C | JIS G3106 | 275 MPa | High-strength welded structural steel with yield strength lower than A612 |
| SM520B / SM520C | JIS G3106 | - | Slightly lower strength compared to the SM53 series |
SPV355 is the grade most commonly recognized as functionally equivalent to A612 under Japanese pressure vessel codes. While the SM series may be referenced for certain projects, their yield strength (275 MPa) is substantially lower than A612's 345 MPa, so they are not strict equivalents.
4.Other International Standards
| Standard System | Grade | Remarks |
|---|---|---|
| ISO | E460DD / P355N | Equivalent grades under International Organization for Standardization |
| UK (BS) | P460N | Aligned with EN standards |
| France (NF) | P460NL1 | Aligned with EN standards |
| Russia (GOST) | 19281-89 | Equivalent grade per Russian GOST standard |
| Australia (AS) | 3503-2002 | Equivalent grade per Australian AS standard |
| ASTM (USA) | SA516 Gr.70 / A537 Class 2 | Different strength or toughness grades; not direct equivalents |
Key Guidelines for Selecting Equivalent Grades
1.No 100% perfect full equivalence.
National standards differ in details including chemical composition, heat treatment requirements, and impact test temperatures. There is no material that matches every technical parameter of A612 exactly. All matching grades are only engineering equivalents, not full standard equivalents.
2.Critical discrepancies requiring attention.
- Low-temperature impact toughness temperature: A612 mandates minimum impact energy of 27 J at -40°C. By contrast, Q345R generally requires 34 J at 0°C, and P355N is tested at -20°C. Extra caution is mandatory for low-temperature service conditions.
- Delivery condition: A612 is normally specified to be supplied in normalized condition. When selecting equivalent grades, clearly stipulate that suppliers deliver plates in normalized state.
- Thickness limitation: ASTM A612 caps the maximum nominal thickness at 25 mm (1 inch), while the available thickness ranges of each equivalent grade may vary.
We stock authentic ASTM A612 & SA612 plates with mill certs year-round, and we welcome third-party inspection. Inquire today – get a quote in 30 minutes and lock in our best available price!
GNEE GROUP Core Advantages:
✅ 10 years of experience supplying pressure vessel steel; full-range materials compliant with ASTM, ASME, EN, GB and JIS standards available at one stop.
✅ In-house stock covers A612/SA612 and all equivalent grades (Q345R / P355N / SPV355), thickness range 6–60 mm, delivered in normalized condition.
✅ Free technical verification reports for material substitution to assist your approval by design institutes and end clients.
✅ Small-batch trial orders supported to cut your trial & error costs.
ASTM A612/A612M Standard Stock Inventory List
| Thickness (mm) | Standard Width (mm) | Standard Length (mm) | Minimum Stock Tonnage |
|---|---|---|---|
| 8 | 1500 / 1800 | 6000 / 8000 | ≥ 50 MT |
| 10 | 1500 / 1800 | 6000 / 8000 | ≥ 80 MT |
| 12 | 1500 / 2000 | 6000 / 9000 | ≥ 100 MT |
| 14 | 1500 / 2000 | 6000 / 9000 | ≥ 60 MT |
| 16 | 1500 / 2000 | 6000 / 10000 | ≥ 120 MT |
| 20 | 1800 / 2200 | 6000 / 10000 | ≥ 150 MT |
| 25 | 1800 / 2200 | 6000 / 10000 | ≥ 80 MT |
| 30~50 | 2000 / 2500 | 6000 / 12000 | Stock availability to be confirmed per order |
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FAQ:
1.What is PVQ steel plate? Why is it so important?
Pressure Vessel Quality (PVQ) steel ensures exceptional impact toughness and strict quality control, which is typically required for ASME vessels and high-pressure systems.
2.Is ASTM A612 steel plate suitable for welding in pressure vessel manufacturing?
Yes, ASTM A612 steel plate has a low carbon content and a controlled composition, offering excellent weldability; however, thicker plates may require preheating.
3.What type of heat treatment is required for ASTM A612 normalized steel plate?
ASTM A612 steel plates are typically supplied in a normalized condition to ensure uniform mechanical properties and reliable performance in pressure vessel applications.
4.What certifications are available for ASTM A612 pressure vessel steel plates?
ASTM A612 steel plates can be supplied with a Factory Test Certificate (EN 10204 3.1) as well as third-party inspection reports, such as those from SGS, BV, or TÜV.
5.What is the maximum thickness of ASTM A612 steel plates for pressure vessels?
Standard ASTM A612 steel plates are typically available in thicknesses up to approximately 25 mm, depending on production capabilities.
