SA515 Grade 70 is an ASME-specified carbon steel plate for pressure vessels, featuring excellent tensile strength (485-655 MPa) and weldability. It is widely applied in moderate-temperature pressure equipment such as boilers and storage tanks.
Specification List of SA515 Grade 70 Sheets/Plates
| Grade | ASME SA515 GR.70 |
| Specifications | ASTM / ASME |
| Hardness | Half Hard, Quarter Hard, Soft, Hard, Spring Hard etc. |
| Standard | AISI, ASTM, BS, GB, JIS |
| Thickness | 6mm-300mm |
| Form | Strip, Foils, Rolls, Coils, Perforated Sheet, Chequered Plate, Plain Sheet, Shim Sheet, Flats, Blank (Circle), Ring (Flange) |
| Finish | Cold rolled sheet (CR), 2B, 2D, Hot rolled plate (HR), BA NO(8), SATIN (Met with Plastic Coated) |
| Width | 1500mm-4050mm |
| Specialize | Perforated Sheet, Shim Sheet, B. Q. Profile. |
| Export to | Egypt, Ireland, Brazil, Iran, Spain, Canada, Korea, India, Saudi Arabia, Thailand, Singapore, Indonesia, Oman, Dubai, Ukraine, USA, Peru, etc |
| Length | 3000mm to 15000mm |
SA515Gr70 Pressure Vessel Steel Chemical Composition:
| Steel Grade | The Element Max (%) | ||||
|---|---|---|---|---|---|
| C | Mn | P | S | Si | |
| SA515 grade 70 | 0.30-0.35 | 1.30 | 0.035 | 0.035 | 0.13-0.45 |
SA515Gr70 Boiler And Pressure Veseel Steel Plate Mechanical Properties:
| Steel Grade | Thickness mm | Yield Min Mpa | Tensile Mpa | Elongation Min % |
|---|---|---|---|---|
| SA515 grade 70 | 200 | 260 | 485-620 | 17 |
| 50 | 21 |
SA 515 Grade 70 Advantages
Outstanding High-Temperature Performance: Excels in 300-450℃ working environments, with excellent high-temperature strength and oxidation resistance. Ensures stable operation of boiler drums, reactors and other components under medium-high pressure (4-12MPa), matching power generation and petrochemical industry demands.
Good Corrosion Resistance: Resists mild hydrogen sulfide corrosion and flue gas corrosion below 450℃, suitable for hydrogenation refining, garbage incineration and other harsh working conditions, extending component service life.
Excellent Processability: Features good weldability (low carbon equivalent) and formability, adapting to welding, cutting, bending and other processes. Easy to process into various components like heat exchanger shells and storage tanks, improving production efficiency.
Cost-Effectiveness: Balances high performance and reasonable cost. Replaces expensive alloy steels in many medium-pressure scenarios, reducing equipment manufacturing and maintenance costs while meeting industry standards.
Wide Applicability: Versatile for power generation, petrochemical, environmental protection, offshore drilling and other industries, suitable for manufacturing diverse pressure-bearing and high-temperature components.
SA 515 Grade 70 Processing Characteristics
Excellent Weldability: Low carbon equivalent (≤0.42) minimizes hydrogen cracking risks during welding. It adapts to various welding methods (manual arc, gas metal arc, submerged arc) without strict pre-heating requirements (only 80-150℃ for thick plates), ensuring stable weld joints with good toughness and strength.
Good Formability: The material has moderate hardness and high ductility, enabling smooth cold and hot forming. Cold forming is feasible for thin plates, while hot forming (200-350℃) reduces resistance for thick plates, avoiding deformation and cracking. Post-forming stress relief is simple and effective.
Easy Cutting Performance: It can be processed by plasma, oxy-fuel, or mechanical cutting. No excessive pre-heating is needed for thin to medium plates, ensuring high cutting efficiency and smooth edges. Thick plates only require low-temperature pre-heating to prevent edge brittleness.
Stable Heat Treatment Response: It responds well to normalization and stress relief annealing. Normalization refines grains uniformly, enhancing strength and toughness. Stress relief annealing effectively eliminates residual stress from processing, improving dimensional stability of finished components.
Compatible Surface Treatment: It easily adapts to sandblasting, pickling, and coating processes. Oxide scales and impurities can be removed efficiently, ensuring good adhesion of anti-corrosion coatings and extending service life in harsh environments.
Key Industrial Applications
Boiler Systems: Crucial for manufacturing steam drums, boiler shells, mud drums, and headers where the steel must resist high thermal stress.
Pressure Vessels: Used in welded pressure vessels that operate at temperatures where carbon steel is prone to graphitization; the coarse grain structure of SA515 helps prevent this.
Heat Exchangers & Condensers: Ideal for the heavy-duty plates used in thermal exchange units within chemical plants and power stations.
Petrochemical Refining: Used for reactors and distillation columns that process hydrocarbons at elevated temperatures.
Power Generation: Common in the construction of stationary pressure parts for thermal power plants.
Why use SA515 over SA516?
While both are carbon steels, SA515 Gr 70 is preferred for high-heat applications because its coarse grain size offers better creep resistance (resistance to deformation over time). Conversely, SA516 is preferred for low-temperature toughness.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
Is SA515 Grade 70 available in coil form?
SA515 Grade 70 is mainly supplied as plates, but it can also be produced in coil form for specific applications. Coils are typically used for manufacturing small-diameter pressure vessels or components requiring continuous processing.
Is SA515 Grade 70 suitable for high-pressure applications?
Yes, it is suitable for moderate to high-pressure applications. Its tensile and yield strength meet ASME requirements for pressure vessels, making it ideal for systems with operating pressures up to several megapascals.
What is the specification code for SA515 Grade 70 in Europe?
The European equivalent specification for SA515 Grade 70 is EN 10028-2 P265GH. Both are carbon steel plates for pressure vessels, with similar chemical compositions and mechanical properties, but comply with different regional standards.
What are the storage requirements for SA515 Grade 70 plates?
They should be stored in a dry, well-ventilated area to prevent rust. Plates should be stacked on wooden supports, separated from moisture and corrosive substances, and covered with waterproof materials if stored outdoors.
What is the maximum carbon content allowed in SA515 Grade 70?
The maximum carbon content allowed in SA515 Grade 70 is 0.31%, as per ASME SA515 standard. Controlling carbon content ensures good weldability and toughness, avoiding excessive hardness that may cause brittleness.
How to inspect SA515 Grade 70 plates for defects?
Common inspection methods include visual inspection (VI), ultrasonic testing (UT) for internal defects, magnetic particle testing (MT) or liquid penetrant testing (PT) for surface defects, ensuring compliance with ASME quality standards.
What is the density of SA515 Grade 70?
The density of SA515 Grade 70 is approximately 7.85 g/cm³ (0.283 lb/in³), the same as standard carbon steel. This value is used for weight calculation in pressure vessel design and manufacturing.
Can SA515 Grade 70 be machined easily?
Yes, SA515 Grade 70 is easy to machine. Its moderate hardness and good ductility allow for turning, milling, drilling, and other machining operations with standard tools, reducing production time and costs.
Can SA515 Grade 70 be used in steam boiler applications?
Yes, it is widely used in steam boiler applications, such as boiler drums and steam headers. It can withstand the moderate temperature and pressure of steam systems, meeting the safety requirements of boiler operations.
What quality certificates are provided for SA515 Grade 70?
Common quality certificates include EN 10204 3.1 or 3.2, which verify chemical composition, mechanical properties, and non-destructive testing results. These certificates ensure the material meets ASME SA515 and project requirements.