ASME SA612 steel plate is a high-strength carbon-manganese-silicon steel specifically engineered for pressure vessel applications in intermediate and low-temperature environments. Compliant with ASME SA612/SA612M standards (fully equivalent to ASTM A612/A612M), it is widely recognized in global industries for its exceptional combination of strength, toughness, and weldability. As a trusted supplier, GNEE provides SA612 steel plates that meet strict international quality requirements, serving sectors such as petrochemicals, energy, and industrial manufacturing.
Key Characteristics of SA612 Steel Plate
SA612's popularity stems from its unique material properties, tailored to the demands of high-pressure, low-temperature equipment:
1. High-Strength Performance
Yield Strength: ≥345 MPa (50 ksi) across all thicknesses (≤25mm standard; up to 100mm custom), significantly exceeding ordinary carbon steel plates.
Tensile Strength: 560-725 MPa, ensuring structural integrity under extreme pressure.
Benefit: Enables lightweight design of pressure vessels, reducing material consumption and overall equipment weight without compromising safety.
| Property | ASME SA612 |
|---|---|
| Yield Strength | ≥ 345 MPa |
| Tensile Strength | 560–725 MPa |
| Elongation | Meets ASME requirements |
2. Superior Low-Temperature Toughness
Impact Resistance: Transverse impact energy ≥27 J at -40℃ (per ASME standards), maintaining ductility and preventing brittle fracture in cold operating conditions.
Application Suitability: Ideal for low-temperature storage tanks, cryogenic equipment, and offshore/marine pressure vessels.
3. Excellent Weldability
Material Type: Fully killed steel (deoxidized via LF + VD refining), minimizing porosity and inclusions in welds.
Welding Compatibility: Compatible with common methods (SMAW, SAW, GTAW, GMAW) without preheating for thin plates (≤25mm); low-hydrogen consumables recommended for optimal results.
Post-Weld Performance: Welded joints retain high strength and toughness, eliminating the need for complex heat treatment in most cases.
4. Strict Chemical Composition Control
Core Elements: Controlled carbon (≤0.25%), manganese (1.00-1.50%), and silicon (0.15-0.50%) content balance strength and weldability.
Impurity Limits: Phosphorus (≤0.035%) and sulfur (≤0.025%) minimized to reduce brittleness and improve corrosion resistance.
Residual Elements: Total residual elements ≤0.80%, ensuring material consistency and reliability.
| Element | Content Limit |
|---|---|
| C (Carbon) | ≤0.25% |
| Si (Silicon) | 0.15-0.50% |
| Mn (Manganese) | 1.00-1.50% |
| P (Phosphorus) | ≤0.035% |
| S (Sulfur) | ≤0.025% |
| Cu (Copper) | ≤0.35% |
| Ni (Nickel) | ≤0.25% |
| Cr (Chromium) | ≤0.25% |
| Mo (Molybdenum) | ≤0.08% |
| V (Vanadium) | ≤0.08% |
5. Standardized Heat Treatment
Delivery Condition: Normalized (heated to 890-950℃, held, then air-cooled), refining grain structure for uniform mechanical properties.
Quality Assurance: Heat treatment process strictly monitored to meet ASME SA-20/SA-20M standards, guaranteeing batch-to-batch consistency.
Typical Applications of SA612 Steel Plate
SA612's versatility makes it a preferred choice for critical pressure vessel and industrial equipment across multiple sectors:
1. Petrochemical & Chemical Industry
High-pressure storage tanks for crude oil, liquefied petroleum gas (LPG), and chemical intermediates.
Reactors, separators, and heat exchangers in refineries and chemical plants.
Pipeline components for transporting corrosive or high-pressure fluids.
2. Energy Sector
Industrial boilers and steam generators for power plants (coal, natural gas, nuclear).
Pressure vessels in renewable energy projects (e.g., biogas storage, hydrogen production equipment).
Heat recovery steam generators (HRSGs) in combined-cycle power systems.
3. Urban Gas & Cryogenic Storage
Liquefied natural gas (LNG) storage tanks and transport vessels.
City gas distribution pipelines and high-pressure gas cylinders.
Cryogenic equipment for food processing, medical, and aerospace industries.
4. Metallurgical & Heavy Machinery
High-pressure vessels for metallurgical processes (e.g., blast furnace gas storage).
Hydraulic systems and pressure components in heavy machinery.
Custom pressure equipment for specialized industrial applications.
GNEE's SA612 Steel Plate Supply Capabilities
As a leading manufacturer of pressure vessel steel plates, GNEE offers comprehensive supply solutions for SA612:
Thickness Range: 6mm-100mm (standard: 6mm-25mm; custom thicknesses available).
Width & Length: 1500mm-4800mm (width) × 6000mm-18000mm (length); cut-to-size service.
Standards Compliance: ASME SA612/SA612M, ASTM A612/A612M, ISO, and customer-specific requirements.
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.
| Other steel plate by GNEE | ||||
| Name | Material | Specification (mm) | Tons | Remark |
| Clad steel plate | P265GH+410,S355JR+410,A516Gr70+316, A537CL1+304L,Q235B+304L,Q345B+304, A516Gr70(NACE)+410,A537CL1+904L, A537CL1+316L,A516Gr70+304L,A537CL1+304 ,A516Gr70+410,A516Gr70+904L |
2-300mm(Based plate),1-50mm(Composited plate) | / | UT, AR, TMCP.Normalized, Quenched and Tempered,Z Direction Test, Charpy V-Notch impact TestThe Third Party Test , Coated or Shot Blasting and Painting. |
| Low Alloy | Q345A, Q345B, Q345C, Q345D, Q345E, Q390, Q420, Q460C, ST52-3, S355J2+N, SS400, SA302GrC, S275NL, 35CrMo | 6 - 350 | 5788.56 | Normalizing, tempered ,controlled rolling, hot rolling , Hot rolling,1st inspection, 2nd inspection, 3rd inspection |
| Pressure Vessel Plate | A204 Grade B,A515 Grade 70,A537 Class 1,SA387 Grade 11 Class 1,P265GH,S537 Class 2,P355Q,P275N,P355N,P690Q,Q345R, | 3 - 300 | 8650 | Normalizing, tempered ,controlled rolling, hot rolling , Hot rolling,1st inspection, 2nd inspection, 3rd inspection |
| High-Strength Plate | A514 Grade F, A572 Grade 50, A588 Grade A, S355JR, S690Q, SS400, S690QL, Q345B, Q345E | 8 - 120 | 3086.352 | Quenched and tempered |
| Wear-Resistant Plate | NM360, NM400, NM450, NM500 | 6 - 150 | 3866.297 | Quenched and tempered |
| Ship Plate | ABS AH32,ABS DH32,ABS EH32,ABS FH36,ASTM A131 A, ASTM A131 EH32,ASTM A131 AH36,CCS A,CCS AH32,LR AH32, DNV A36,BV AH32 |
8 - 200 | 2853.621 | Hot rolling, normalized ,hot rolling controlled rolling, quenched and tempered + toughness and brittleness |