What is SA612 Boiler Vessel Steel Equivalent?

SA612/SA612M is a high-strength carbon-manganese-silicon pressure vessel quality (PVQ) steel specifically designed for welded boilers and pressure vessels operating in moderate-to-low temperature environments (-40°C to 425°C) .

European Standards

EN 10028-3 P355N (most widely recognized equivalent)

Yield: 295-355 MPa (thickness-dependent)

Tensile: 450-630 MPa

Impact: ≥40 J at -20°C

Applications: Pressure vessels, boilers, heat exchangers

P355GH (alternative European equivalent)

Similar mechanical properties to P355N

Used in high-temperature service up to 450°C

Chinese Standards

Q345R (or Q345R-NL for low-temperature applications)

Yield: ≥345 MPa (for thickness ≤16mm)

Tensile: 450-590 MPa

Impact: ≥34 J at 0°C (standard) or -20°C (optional)

Widely used in Chinese pressure vessel industry

Japanese Standards

JIS SM53B/SM53C

Yield: ~355 MPa

Tensile: 510-630 MPa

Applications: Pressure vessels, bridges, construction machinery

JIS SM520B/SM520C (alternative options)

Other International Equivalents

DIN 1.8905/StE 460/P460N (German)

BS P460N (British)

ISO E460DD (International)

For European projects: Specify EN 10028-3 P355N (or P355GH for higher temperatures)

Benefits: Widely available, fully compliant with EU Pressure Equipment Directive (PED)

For Asian projects: Use Q345R (China) or SM53B/C (Japan)

Q345R offers excellent cost-performance ratio in Chinese market

For direct replacement in existing designs: SA516 Gr.70 (though not exact equivalent)

Yield: 230-207 MPa (lower than SA612, requires thicker sections)

Tensile: 485-620 MPa

Impact: ≥27 J at -30°C (standard) or -46°C (optional)

Thickness: Up to 200mm (vs SA612's 25mm limit)

Thickness limitations: SA612 is limited to 25mm thickness, while most equivalents allow up to 200-300mm

Weldability: All equivalents maintain good weldability (CE ≤0.48%), but preheating requirements may differ

Low-temperature performance: SA612 offers better low-temperature toughness (-40°C) compared to standard P355N (-20°C) or Q345R (0°C). For cryogenic applications, specify P355NL1/NL2 or Q345R-NL

Certification: When replacing SA612 with equivalents, ensure materials comply with relevant pressure vessel codes (ASME BPVC, EN 13445, GB 150)

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The closest equivalents to SA612 are EN 10028-3 P355N (European), Q345R (Chinese), and JIS SM53B/C (Japanese). These grades match SA612's strength and toughness characteristics while offering more flexibility in thickness and availability .

GNEE Steel also supplies a variety of boilers and pressure vessel steel plates, such as A204 Grade B,A515 Grade 70,A537 Class 1,SA387 Grade 11 Class 1,P265GH,S537 Class 2,P355Q,P275N,P355N,P690Q,Q345R, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to ru@gneesteelgroup.com. You are welcome to consult us, and we are very willing to answer your questions.

FAQ

What is SA 612 material?

carbon-manganese-silicon steel plate

SA612 is killed carbon-manganese-silicon steel plate made for welded pressure vessels. Its fine grain makes it suitable for use in moderate and lower temperature service where impact resistance is important.

What is the composition of ASTM A612?

ASTM A612 steel plate is a high-strength low-alloy (HSLA) steel plate designed for welded pressure vessels. It has a nominal composition of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, and copper.

What is A612 steel?

ASTM A612 specification is the Standard Specification for Pressure Vessel Plates, Carbon Steel, High Strength, for Moderate and Lower Temperature Service. ASTM A612 encompasses carbon-manganese-silicon steel plates intended for use in welded pressure vessels for moderate and low temperature service.

Are SA612 and A612 Steel Plates the Same Product? What Are the Core Differences?

They are the same type of steel plate. ASTM A612 is the material standard, while ASME SA612 is the designation assigned after ASTM A612 was incorporated into the ASME Boiler & Pressure Vessel Code, specifically for the fabrication of pressure-bearing equipment.

What Are the Executive Standards for SA612/A612 Steel Plates? Are There Any Differences Between the ASTM and ASME Versions?

The executive standards are ASTM A612/A612M and ASME SA612. There are no substantial differences in chemical composition and mechanical properties between the two versions; the only variance lies in their applicable code systems.

What Are the Equivalent Grades of SA612/A612 in Chinese and European Standards? Can They Be Used as Direct Substitutes?

Common approximate equivalent grades include EN P355GH, DIN 1.0473, and GB Q345R. However, they cannot be used as direct equivalents. Their suitability must be confirmed in accordance with design specifications and approval requirements.

What Are the Yield Strength and Tensile Strength of SA612/A612? Do They Vary with Different Thicknesses?

The minimum yield strength of SA612 is approximately 260 MPa, and its tensile strength ranges from 485–620 MPa. As the thickness increases, the allowable minimum yield strength may decrease slightly.

What Are the Low-Temperature Impact Energy Requirements for SA612/A612? Are the Requirements at -40℃ and -45℃ Consistent?

Standards typically require impact testing at -40℃, while testing at -45℃ is not mandatory. If a project specifies -45℃ testing, additional impact tests must be conducted and clearly defined in the technical agreement.

What Are the Minimum and Maximum Service Temperatures for SA612/A612?

The recommended minimum service temperature is approximately -40℃, and the maximum operating temperature is generally around 400℃, depending on the design specifications and service medium.

What Is the Carbon Equivalent of ASME SA612? Is Preheating Required for Welding?

The carbon equivalent is usually around 0.42–0.45. Preheating at 50–120℃ is recommended for welding medium and thick plates. Commonly used welding materials include low-hydrogen electrodes such as E7018 and E7016.

What Is the Routine Thickness Range of SA612/A612, and What Is the Maximum Customizable Thickness?

The routine thickness range is 6–100 mm. Some steel mills can provide customized thicknesses up to 150 mm, subject to confirmation of their rolling and heat treatment capabilities.

What Are the Common Delivery Conditions for SA612/A612?

Common delivery conditions include As-Rolled (AR), Normalized (N), and Normalized + Tempered (N+T), with the normalized condition being the most widely used.

What Is the Machinability of SA612? Is It Prone to Cracking?

SA612 exhibits excellent cutting and bending performance. When processed with proper techniques and preheating, it is not prone to cracking.

Which Is More Suitable for Low-Temperature Applications: SA612 or SA516 Gr.70?

SA612 delivers more stable comprehensive performance in thick plate and high-stress working conditions, whereas SA516 Gr.70 offers better cost-effectiveness in conventional operating conditions.

Can Q345R Be Used as a Substitute for SA612?

Q345R can be used as a substitute in some working conditions for non-ASME projects. However, substitution is not recommended for export projects or scenarios where SA612 is explicitly required by specifications.

What Are the Differences Between SA612 and SA537 Cl.2?

SA537 Cl.2 boasts higher strength and low-temperature performance but comes with a significantly higher cost than SA612. It is suitable for more severe operating conditions.

Is SA612 Vessel Plate Suitable for LNG Storage Tanks?

SA612 is not recommended for primary LNG storage tanks operating at -162℃, but it can be used in LNG auxiliary systems or medium-to-low temperature vessels.

What Is the Hydrogen-Induced Cracking (HIC) Resistance of SA612 Steel Plates?

Standard SA612 does not mandate HIC resistance requirements. For applications involving sulfur-containing media, customized low-sulfur and low-phosphorus SA612 plates must be used, accompanied by HIC testing.