ASTM A516 Grade 70 is a high-strength, weldable, pressure vessel quality (PVQ) carbon steel plate designed for moderate to lower-temperature applications, known for its excellent notch toughness, widely used in boilers, tanks, and piping for the oil, gas, and petrochemical industries, featuring tensile strength from 70-90 ksi (485-620 MPa) and requiring specific chemical compositions and properties for demanding service.
Key Characteristics
Properties: High tensile strength (70-90 ksi), good weldability, and improved impact toughness at lower temperatures.
Manufacturing: Produced to PVQ standards, often normalized for enhanced properties, especially for thicker plates.
Standard: ASTM A516 (ASME SA516 for pressure vessels).
Grade 70: Denotes its higher strength level (compared to Grades 55, 60, 65).
Composition: Medium-carbon steel with manganese, silicon, phosphorus, and sulfur for strength and toughness
Yield/Tensile Strength
|
Metric |
Imperial |
|
|
Tensile Strength, Ultimate |
482 – 620 MPa |
70 – 90 ksi |
|
Tensile Strength, Yield |
262 MPa |
38 ksi |
|
Elongation |
17 |
17 |
A516 Steel Plate Chemical Composition
| Grade 70 | |
| Carbon Max, ≤1/2" Thick | 0.27% |
| Carbon Max, >1/2" & ≤2" Thick | 0.28% |
| Carbon Max, >2" & ≤4" Thick | 0.30% |
| Carbon Max, >4" Thick | 0.31% |
| Manganese | 0.85-1.20% |
| Phosphorus max | 0.025% |
| Sulfur max | 0.025% |
| Silicon | 0.15-0.40% |
applications
Boilers and heat exchangers: It is commonly used in the fabrication of fire-tube and water-tube boilers, as well as heat exchangers in power plants and industrial facilities. Its good toughness and weldability make it suitable for handling high-pressure steam and hot fluids.
Storage tanks: The steel is frequently employed in the construction of large storage tanks for petroleum, natural gas, and other liquids. Its ability to resist brittle fracture is important for ensuring the integrity of these large, welded structures.
Pressure vessels: It is a preferred material for pressure vessels in the oil and gas, chemical, and petrochemical industries. These vessels may operate under high internal pressures and require materials with consistent strength and toughness.
Pipelines and pipe components: A516 Grade 70 is also used in the manufacture of heavy-wall pipes, pipe fittings, and headers that transport fluids under pressure, particularly in refineries and processing plants.
General industrial equipment: It finds application in various other heavy equipment, such as process vessels, separators, and reactors, where reliable containment of pressurized fluids or gases is necessary.
Comparison with Other Grades
|
Grade |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Key Application |
|---|---|---|---|
|
ASTM A516 GR 70 |
485–620 |
260 |
High-pressure vessels, boilers |
|
ASTM A516 GR 65 |
450–585 |
240 |
Cost-effective for medium pressure |
|
ASTM A516 GR 60 |
415–550 |
220 |
High ductility, moderate pressure |
|
ASTM A516 GR 55 |
380–515 |
205 |
Less demanding applications |
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What are the standard yield strength and tensile strength values of A516 Grade 70?
The minimum yield strength (σs) is 260MPa, and the tensile strength (σb) ranges from 485MPa to 655MPa. These strength indicators ensure that the steel plate is not prone to plastic deformation and fracture in pressure-bearing environments, safeguarding equipment safety.
How to judge the authenticity of A516 Grade 70 steel plates?
It can be done by verifying the steel mill's quality certificate (material list), testing chemical composition and mechanical properties, checking steel plate marks (standard number, grade, specification), and conducting non-destructive testing if necessary to eliminate counterfeit and shoddy products.
What is the complete execution standard number for A516 Grade 70?
The complete version number is ASTM A516/A516M-22, where "A516" is the main standard number, "M" indicates metric units, and "22" is the latest version year. This standard specifies various technical requirements for the material.
Can A516 Grade 70 be strengthened by heat treatment?
It can undergo heat treatments such as normalizing and tempering. Normalizing can refine grains and improve toughness, while tempering can eliminate welding stress. However, this material is carbon steel, and the quenching strengthening effect is limited, so quenching treatment is generally not adopted.
What are the advantages of A516 Grade 70 in natural gas storage tank manufacturing?
The advantages are good weldability, which facilitates the welding and forming of large storage tanks; excellent medium and low temperature toughness, which is suitable for the low-temperature working conditions of natural gas storage; strength meets pressure-bearing requirements, and the cost is relatively lower than that of alloy steel plates.
Can A516 Grade 70 be used to manufacture boiler drums?
Yes, because it has good medium and low temperature strength, toughness and fatigue resistance, which meets the requirements of boiler drums for pressure-bearing materials. During manufacturing, strict control of welding quality and non-destructive testing is required to ensure safe operation.
What is the usual delivery status of A516 Grade 70 steel plates?
The usual delivery status is hot-rolled or controlled-rolled, and normalizing treatment (N) can be performed if necessary. Normalizing treatment can refine grains, improve the toughness and uniformity of the steel plate, and meet the requirements for material stability in harsh working conditions.
How to test the mechanical properties of A516 Grade 70?
The main tests include tensile test (to measure yield strength, tensile strength and elongation), impact test (Charpy V-notch, to evaluate low-temperature toughness), and hardness test. Test samples must be cut from the steel plate itself in accordance with relevant ASTM standards.
What is the applicable temperature range of A516 Grade 70?
The applicable temperature range is -30℃ to 450℃. Within this range, it can maintain stable mechanical properties, with no risk of brittle fracture at low temperatures, and its strength and toughness meet the operating requirements of pressure-bearing equipment at high temperatures.