SA612 and SA516 Gr.70 belong to mainstream carbon steel pressure vessel plate, deployed for global petrochemical, energy and offshore pressure equipment projects.
SA612 VS SA 516 GR.70：Selection Conclusion
Selection is determined by three primary technical factors: design pressure/temperature, wall thickness requirement, and service environment.
| Selection Criteria | Prefer SA612 | Prefer SA516 Gr70 |
|---|---|---|
| Minimum Design Temperature | ≤ -30°C (-40°C ~ -30°C) | ≥ -29°C (Ambient ~ -29°C) |
| Equipment Types | LNG storage tanks, cryogenic pressure vessels, offshore platform equipment, portable pressure tanks | Ambient-temperature boilers, standard medium & low-pressure vessels, petrochemical atmospheric equipment |
| Cost Priority | Lightweight design, priority on total material cost control | Low unit price priority, small-batch conventional projects |
| Certification Requirements | ASME U-stamp, PED cryogenic certification | General pressure vessel certification |
| Service Conditions | High pressure, cyclic loading, wet hydrogen sulfide service | Ambient temperature & atmospheric pressure, non-corrosive service |
Choose SA612 if your project meets any of the following:
- Medium/high pressure, medium/low temperature equipment with weight reduction design targets.
- Above-ground LPG storage tanks, medium & small high-pressure separators, cryogenic heat exchangers.
- Assets deployed in frigid zones; minimum service temperature down to -40°C, extended to -60°C under select extreme operating conditions.
- Projects requiring equipment mass reduction and controlled plate dead weight.
Choose SA516 Gr.70 if your project meets any of the following:
- General petrochemical pressure vessels, distillation columns, reactors, boiler drums (majority standard units)
- Large atmospheric / medium-pressure storage tanks, thick-wall spherical tanks, process equipment exposed to H₂S service (HIC-resistant grade available as option)
- Service temperature range: -29°C to 400°C
- Projects without strict weight reduction requirements, with unit procurement cost as primary control target
Not sure which grade fits your project?→Send drawings & service conditions, get free material selection solutions.
SA612 VS SA 516 GR.70：Chemical properties
| Grade | C | Mn | Si | P | S |
|---|---|---|---|---|---|
| SA516 Gr.70 | ≤ 0.28 | 0.85–1.20 | 0.13–0.45 | ≤ 0.035 | ≤ 0.035 |
| SA612 | ≤ 0.23 | 0.50–1.20 | ≤ 0.40 | ≤ 0.035 | ≤ 0.035 |
SA612 VS SA 516 GR.70：Mechanical properties
| Property | SA516 Gr.70 | SA612 |
|---|---|---|
| Yield Strength | ≥ 260 MPa | ≥ 345 MPa |
| Tensile Strength | 485–620 MPa | 560–725 MPa |
| Elongation | Higher | Slightly lower but adequate |
SA612 VS SA 516 GR.70：Typical Applications
SA612 Typical Applications
- Cryogenic storage tanks (LNG, ethylene, liquid ammonia) operating at -45°C to -30°C
- Offshore platform pressure vessels and cold-region industrial equipment
- High-pressure lightweight mobile pressure transport tanks
- ASME U-stamp certified low temperature pressure equipment
- Sour service wet hydrogen sulfide pressure vessels (HIC-resistant version available)
SA 516 GR.70 Typical Applications
- Normal temperature boilers and medium pressure vessels operating at -29°C to 400°C
- Atmospheric storage tanks for oil, gas and petrochemical industries
- General purpose heat exchangers and process vessels
- Non-cryogenic conventional pressure equipment projects
SA612 VS SA 516 GR.70：Welding & Fabrication Properties
| Property | SA516 Gr.70 | SA612 |
|---|---|---|
| Material Positioning | General-purpose pressure vessel steel plate | High-strength pressure vessel steel plate |
| Minimum Yield Strength | 260 MPa | 345 MPa |
| Weldability Rating | Excellent | Good |
| Fabrication Convenience | High welding process tolerance; low pre/post heat treatment requirements | Requires strict welding parameter control; preheating may be required for thick plates |
| Machinability Rating | Fair | Good |
| Cold Formability | Very good | Good |
| Key Advantages | Lower manufacturing cost, widely available, broad application scope | Higher strength, allows reduced wall thickness design, lower equipment weight |
| Target Applications | Conventional pressure vessels, boilers, heat exchangers | LPG transport tanks, high-pressure storage tanks, low-temperature service equipment |
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SA612 carbon equivalent CEV ≤ 0.45%, 6% lower than SA516 Gr.70 (≤0.48%)
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No preheating required for SA612 thickness ≤ 20mm, low-temperature preheating only for thicker section.
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Fabrication cost saving: 30% lower welding labor cost, 25% shorter project timeline.
- Lower weld cracking risk, reduced post-weld inspection and rework cost.
SA612 VS SA 516 GR.70：Cost Comparison
| Cost Item | SA612 | SA516 Gr70 | Cost Difference Conclusion |
|---|---|---|---|
| Unit plate price | 8%~12% higher than SA516 | Base reference price | SA612 has a slightly higher unit price |
| Designed wall thickness | 20%~25% thinner (higher tensile strength) | Base reference thickness | Total material weight of SA612 cut down by 20% |
| Total material cost | 10%~15% lower than SA516 | Base reference cost | ✅ SA612 delivers lower total material cost |
| Welding & fabrication cost | 30% cost reduction (low carbon equivalent, no preheating required) | Base reference cost | ✅ SA612 features lower processing cost |
| Transportation / Installation cost | 20% weight reduction brings corresponding cost cut | Base reference cost | ✅ SA612 achieves lower full-life-cycle supply chain cost |
Get Detailed Cost Breakdown Sheet.→Inquiry Now
Success Stories
Case 1：LPG Tanker Manufacturer
Challenge
The client needed to increase the payload capacity of their LPG tankers while maintaining safety and regulatory compliance.
Solution
We recommended switching from SA516 Gr70 (12mm thickness) to ASME SA612 (10mm thickness), leveraging the higher strength-to-weight ratio.
Results
The transition reduced the weight of each tank by 1.2 tons, allowing the client to transport 8% more LPG per trip while maintaining the same overall vehicle weight. This resulted in significant operational cost savings and increased profitability.
Case 2：Mining Project High-Pressure Vessels
Challenge
A mining project in Peru required high-pressure air tanks with 40mm thick plates, but faced challenges with local processing capabilities and tight deadlines.
Solution
We provided complete solution including 40mm thick ASME SA612 plates with CNC cutting, rolling, and beveling services, delivered ready for welding.
Results
By providing pre-processed plates, we saved the client 3 weeks of production time and eliminated the need for expensive local outsourcing. The high strength of SA612 also ensured the pressure vessels met the demanding operational requirements of the mining environment.
Both grades come with MTC 3.1 / 3.2 test certificates and UT ultrasonic test reports.
Free cryogenic welding procedure specification (WPS) guidance and full ASME supporting documentation are provided exclusively for SA612.
Contact us now for the latest quote and selection guidance.
FAQ:
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 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.
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.
What is SA 516 GR 70 equivalent to?
What is the equivalent material for A516 GR 70? Common equivalents include ASME SA516 GR 70, EN 10028 P355GH, and BS1501 224-490 A & B, suitable for similar pressure vessel applications.
