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ASTM A516 Grade 70 is a widely used carbon steel plate for welded pressure vessels, boilers, and storage tanks in moderate and lower-temperature service. Covered by ASTM A516/A516M, it offers higher tensile and yield strength than A516 Gr.60, supporting more efficient plate thickness selection under applicable design codes. A516 Gr.70 also provides good weldability and toughness, with impact testing specified when required by operating conditions. Common applications include pressure vessel shells and heads, boiler components, welded storage tanks, oil and gas separators, and petrochemical process equipment. Suitability depends on design pressure, temperature, thickness, corrosion conditions, and code requirements.
What Is ASTM A516 Gr.70 Carbon Steel Plate?
ASTM A516 Gr.70 is a pressure-vessel-quality carbon steel plate specified under ASTM A516/A516M. Primarily intended for welded pressure vessels—widely used in boilers, storage tanks, separators, and other industrial equipment.
Valued for its combination of tensile strength, toughness, and weldability—suitable for many pressure-service applications.
Grade 70 identifies a strength grade within ASTM A516—it has higher specified tensile and yield strength requirements than A516 Gr.60 and Gr.65.
Quick Overview
Property | ASTM A516 Gr.70 Requirement |
|---|---|
Tensile strength | 485–620 MPa (70–90 ksi) |
Minimum yield strength | 260 MPa (38 ksi) |
Minimum elongation | Depends on specimen type and thickness |
General reference requirements—actual acceptance criteria should be checked against applicable standard edition, specimen dimensions, and plate thickness.
1. Chemical Composition
Element | Contribution |
|---|---|
Carbon (C) | Contributes to strength and hardness—content must be controlled to maintain suitable weldability |
Manganese (Mn) | Supports strength and hardenability; helps achieve required mechanical performance |
Silicon (Si) | Acts as a deoxidizing element during steelmaking; contributes to material strength |
Phosphorus (P) & Sulfur (S) | Residual elements—controlled because excessive levels can negatively affect toughness, ductility, and weld quality |
Exact composition limits depend on: applicable ASTM A516/A516M edition, plate thickness, and specified product requirements. Always check the relevant standard and material test certificate—not general composition ranges.
2. Mechanical Properties
Commonly selected when pressure equipment requires a higher strength level within the A516 grade range.
Impact testing may also be required when design temperature, construction code, or purchase specification calls for additional toughness verification.
3. Heat Treatment and Delivery Conditions
May be supplied in different delivery conditions—depending on thickness and applicable standard requirements.
Normalized plates are commonly specified for pressure-vessel applications—particularly when improved toughness or specific fabrication requirements are needed.
Confirm other heat-treatment or delivery requirements against the purchase order and relevant ASTM provisions. Verify heat-treatment condition through material documentation.
4. Common Product Applications
Application | Typical Use |
|---|---|
Welded pressure vessel shells and heads | Pressure-containing equipment |
Boiler pressure-containing components | Where permitted by design code |
Industrial storage and process vessels | Various industrial applications |
Oil and gas separators | Separation equipment |
Petrochemical and chemical processing equipment | Process industry applications |
Final material choice depends on: pressure, temperature, fluid characteristics, corrosion allowance, thickness, and design-code requirements.
5. Why A516 Gr.70 Is a Popular Choice
Combines a relatively high strength level with properties suitable for welded pressure-vessel fabrication.
Established specification and broad industrial use make it a familiar material for engineers, manufacturers, and procurement teams.
Important: Do not select by grade designation alone. Confirm:
Chemical composition
Mechanical properties
Heat treatment
Impact-test requirements
Dimensions
Material traceability
Main Applications of A516 Gr.70 Plates in Pressure Vessels and Boilers
ASTM A516 Gr.70 carbon steel plate is widely used in welded pressure vessels, boilers, storage tanks, and industrial process equipment. Its combination of specified tensile strength, suitable toughness, and weldability makes it a common choice for pressure-containing components under moderate and lower-temperature service conditions.
Suitability depends on: operating conditions, plate thickness, fabrication requirements, and applicable construction code.
Application Overview
Application | Main Selection Considerations |
|---|---|
Pressure vessel shells | Design pressure, temperature, thickness, welding |
Vessel heads | Forming requirements, thickness, toughness |
Boiler drums | Boiler code compliance, pressure, temperature |
Oil & gas separators | Pressure, fluid composition, corrosion conditions |
Petrochemical vessels | Process conditions, corrosion allowance, fabrication |
1. Applications in Pressure Vessels
Pressure vessels store or process liquids and gases under internal or external pressure.
Component | Typical Use | Key Consideration |
|---|---|---|
Pressure vessel shells | Rolled into cylindrical or other shapes; welded to form main vessel body | Must meet design requirements for pressure, temperature, and wall thickness |
Vessel heads | Formed into elliptical, hemispherical, or other designed heads | Proper forming and heat-treatment procedures important to maintain required material properties |
Separators | Oil and gas separators—separate gas, oil, and water | May be specified for vessel body according to design conditions |
Process vessels | Chemical and petrochemical facilities—mixing, storage, processing | Material selection must consider pressure, temperature, and chemical characteristics of process fluid |
2. Applications in Boilers
Boilers generate steam by transferring heat to water under controlled pressure and temperature.
Application | Key Point |
|---|---|
Boiler drums | Plates may be used to fabricate pressure-containing boiler drums—subject to material and construction requirements of applicable code |
Boiler shells | In certain designs—specified for welded shell sections containing pressurized water or steam |
Pressure-containing headers & vessels | May be considered for associated equipment where design code permits |
Important: A516 Gr.70 is a plate specification—not a substitute for dedicated boiler tube specifications such as ASTM A192 or ASTM A213. Distinguish pressure-vessel plates from boiler and heat-transfer tubes.
3. Applications in Oil, Gas, and Petrochemical Industries
Industry | Typical Equipment |
|---|---|
Oil & gas processing | Pressure separators, gas treatment vessels, other welded process equipment |
Refineries | Storage and process vessels operating under specified pressure and temperature conditions |
Petrochemical plants | Reactors, pressure tanks, other equipment designed for suitable service conditions |
Industrial utilities | Compressed-air receivers, other pressure-containing equipment—where material approved by design specification |
For corrosive service: additional evaluation is necessary. Standard A516 Gr.70 does not automatically provide resistance to every process fluid. Corrosion allowance, material upgrades, cladding, or other protective measures may be required.
4. Key Considerations Before Use
Before selecting A516 Gr.70 plates, confirm:
Design pressure and operating temperature
Minimum design metal temperature
Plate thickness and corrosion allowance
Applicable construction code
Chemical composition and mechanical properties
Heat-treatment condition
Impact-test requirements
Key Selection Points for ASTM A516 Gr.70 Carbon Steel Plates
Selecting the correct ASTM A516 Gr.70 carbon steel plate is essential for pressure vessel safety, fabrication quality, and long-term service reliability. Although widely used, not every plate is suitable for every application.
Key evaluation factors: material properties, operating conditions, dimensions, and applicable construction codes.
Selection Checklist at a Glance
Step | What to Confirm |
|---|---|
1. Material grade & standard | ASTM A516 Gr.70 or applicable edition; supplementary requirements |
2. Thickness & dimensions | Design-calculated thickness, width/length, tolerances, forming requirements |
3. Operating temperature & toughness | Minimum design metal temperature, impact testing requirements |
4. Chemical composition & mechanical properties | Element content, tensile/yield strength, elongation, hardness, impact results |
5. Welding & fabrication | WPS, preheating, heat input, PWHT, forming/stress relief |
6. Heat treatment & inspection | Delivery condition, chemical/tensile/impact testing, dimensional inspection, NDE |
7. Code compliance & documentation | Applicable ASME code, material certification, supplementary inspection |
1. Confirm the Material Grade and Standard
Verify that the project specifically requires ASTM A516 Gr.70 or the corresponding applicable edition of ASTM A516/A516M.
Grade | Key Characteristic |
|---|---|
Gr.60, Gr.65 | Lower strength grades |
Gr.70 | Higher specified tensile and yield strength requirements than lower grades |
Important: Higher strength does not automatically make it the best choice. Selected grade must meet design calculations, fabrication requirements, and applicable pressure equipment code.
Also confirm whether additional requirements (supplementary testing, special delivery conditions) are included in the purchase specification.
2. Select the Correct Plate Thickness and Dimensions
Plate thickness directly affects pressure-bearing capacity, equipment weight, forming operations, and manufacturing costs.
Dimension Factor | Key Point |
|---|---|
Thickness | Determine required thickness through pressure-vessel design calculations—including applicable allowances |
Width & length | Match plate dimensions to vessel shell, head, and cutting layout |
Dimensional tolerances | Confirm thickness and other tolerances per applicable standard and purchase order |
Forming requirements | Consider plate thickness, bending radius, and head-forming procedures |
Confirm final dimensions with equipment drawings and fabrication plan.
3. Evaluate Operating Temperature and Toughness
Operating temperature is a major consideration. Low-temperature service may require additional impact toughness verification to reduce risk of brittle fracture.
Identify:
Minimum design metal temperature
Maximum operating temperature
Pressure conditions
Possible temperature fluctuations
Charpy V-notch impact testing may be required—depending on applicable design code, plate thickness, and project specification.
Do not assume A516 Gr.70 is suitable for all low-temperature or high-temperature applications without checking relevant requirements.
4. Check Chemical Composition and Mechanical Properties
Must comply with the specified ASTM grade.
Property | What to Verify |
|---|---|
Chemical composition | Carbon, manganese, silicon, phosphorus, sulfur content |
Strength | Tensile strength and minimum yield strength |
Ductility | Elongation |
Hardness | Where specified |
Toughness | Impact-test results, when required |
These properties influence strength, weldability, toughness, and fabrication performance. Review the material test certificate—not just the product label.
5. Consider Welding and Fabrication Requirements
Commonly used in welded pressure vessel manufacturing—but successful fabrication depends on suitable welding procedures and process control.
Consideration | Key Point |
|---|---|
Welding procedures | Specifications and qualification |
Preheating | Where applicable |
Heat input | Control of welding heat input |
PWHT | Post-weld heat treatment when required by design code or project specification |
Forming & stress relief | Requirements must be evaluated |
Material grade, thickness, joint design, and fabrication method should be evaluated together.
6. Verify Heat Treatment and Quality Inspection
Heat-treatment conditions must comply with applicable ASTM requirements and the purchase order.
Normalizing may be required for certain thicknesses or specified conditions—but do not assume every A516 Gr.70 plate has the same delivery condition.
Quality verification may include: chemical analysis, tensile testing, impact testing, dimensional inspection, and ultrasonic examination when specified.
Also important: material identification, heat-number traceability, and complete documentation.
7. Confirm Code Compliance and Supplier Documentation
A516 Gr.70 plates used in pressure equipment must meet relevant construction code and project requirements.
Before procurement, confirm:
Required ASTM specification
Applicable ASME code provisions
Material certification
Any supplementary inspection requirements
Manufacturing, Welding, and Quality Inspection Requirements
The manufacturing, welding, and inspection processes of ASTM A516 Gr.70 carbon steel plates directly affect the safety and reliability of pressure vessels and boilers. Even when the selected material meets the required grade, improper production control or fabrication can lead to dimensional problems, welding defects, or reduced service performance.
Overview at a Glance
Area | Key Requirements |
|---|---|
1. Manufacturing | Controlled steelmaking, casting, reheating, rolling; delivery condition (as-rolled or normalized) per order |
2. Welding | Qualified WPS/PQR, preheating, heat input control, filler metal selection, PWHT where required |
3. Quality inspection | Chemical analysis, tensile testing, impact testing, dimensional inspection, surface inspection, UT where specified |
4. Certification & traceability | MTC with grade, standard, heat number, chemical/mechanical results, delivery condition; heat-number marking |
1. Manufacturing Process
Generally produced through steelmaking, casting, reheating, and rolling.
Stage | Key Point |
|---|---|
Steelmaking | Chemical composition controlled to meet ASTM A516/A516M requirements |
Casting | Steel cast into slabs or other suitable semi-finished forms |
Reheating & rolling | Hot rolling to achieve specified plate thickness and dimensions; rolling parameters must be properly controlled for uniform thickness and consistent mechanical properties |
Delivery condition | May be supplied as-rolled or normalized—depending on applicable specification, plate thickness, and purchase requirements |
Normalizing involves heating to appropriate temperature followed by controlled air cooling—can help refine grain structure and improve property consistency. Not automatically required for every plate—applicable standard and order requirements determine delivery condition.
2. Welding Requirements
Commonly used in welded pressure vessel construction—suitable welding procedures are essential.
Consideration | Key Point |
|---|---|
Qualified welding procedures | WPS and supporting PQR should comply with applicable construction code |
Preheating | Requirements depend on material thickness, composition, joint details, welding process, and applicable code provisions |
Heat input control | Excessive or insufficient heat input can affect weld metal and heat-affected zone—maintain appropriate welding parameters |
Filler metal selection | Consumables should be compatible with base material and required mechanical properties |
Post-weld heat treatment | PWHT may be required depending on thickness, design code, service conditions, and project specifications—not a universal requirement for every A516 Gr.70 weld |
Proper joint preparation, qualified welders, and controlled fabrication procedures help reduce defects and improve weld quality.
3. Quality Inspection and Testing
Inspection scope should be defined by ASTM standards, purchase order, and applicable pressure equipment code.
Inspection Item | Main Purpose |
|---|---|
Chemical analysis | Verify chemical composition |
Tensile testing | Confirm tensile and yield strength |
Impact testing | Evaluate toughness when required |
Dimensional inspection | Check thickness, width, length, and tolerances |
Surface inspection | Identify visible surface defects |
Ultrasonic testing (UT) | Detect internal discontinuities when specified |
For fabricated pressure vessels: additional NDE may include RT, MT, or PT—depending on weld material, joint type, and inspection requirements. These methods are not necessarily mandatory for every plate or weld.
4. Material Certification and Traceability
Material documentation is an important part of pressure vessel procurement.
Request a material test certificate (MTC) showing:
Material grade and applicable standard
Heat number
Chemical composition
Mechanical test results
Delivery condition
Heat-number marking and traceability help ensure plates remain identifiable throughout cutting, forming, welding, and final assembly.
Additional inspection reports, impact-test records, and heat-treatment documents should be provided when required by the purchase order.
A516 Gr.70 vs. Other Common Pressure Vessel Steel Grades
Choosing the right carbon steel plate is essential for pressure vessel safety, manufacturing efficiency, and long-term performance. ASTM A516 Gr.70 is widely used in welded pressure vessels—combining relatively high specified strength with suitable toughness and weldability.
Other material options (depending on design pressure, temperature, fabrication, and codes): A516 Gr.60, A516 Gr.65, ASTM A36, or ASTM A572 Grade 50.
Quick Comparison
Material Grade | Min. Yield Strength (Typical) | Tensile Strength (Typical) | General Characteristics |
|---|---|---|---|
A516 Gr.60 | 220 MPa (32 ksi) | 415–550 MPa (60–80 ksi) | Lower strength grade |
A516 Gr.65 | 240 MPa (35 ksi) | 450–585 MPa (65–85 ksi) | Intermediate strength grade |
A516 Gr.70 | 260 MPa (38 ksi) | 485–620 MPa (70–90 ksi) | Higher strength grade |
Commonly specified ranges—check applicable requirements and testing conditions against relevant ASTM edition and plate thickness.
1. A516 Gr.70 vs A516 Gr.60 and Gr.65
All three are pressure vessel grades—the main difference is specified mechanical strength.
Grade | Suitable For |
|---|---|
Gr.60 | Pressure equipment with lower strength requirements |
Gr.65 | Intermediate option |
Gr.70 | Higher specified strength—frequently selected for pressure vessel shells and pressure-containing components |
A higher grade does not automatically provide better performance in every situation. Final choice must consider: toughness, thickness, temperature, fabrication, and design calculations.
2. A516 Gr.70 vs ASTM A36
Aspect | A516 Gr.70 | ASTM A36 |
|---|---|---|
Application | Welded pressure vessels | General structural fabrication—buildings, bridges, supports |
Mechanical requirements | Specified strength requirements suited to pressure vessel design | Different mechanical property requirements |
Toughness | Includes requirements relevant to pressure vessel service—including impact testing when specified | — |
Material qualification | Must meet applicable pressure equipment construction code | Structural steel specification |
A36 should not be substituted for A516 Gr.70 simply because it is available or has adequate strength for a basic structural calculation.
3. A516 Gr.70 vs ASTM A572 Grade 50
Aspect | A516 Gr.70 | ASTM A572 Grade 50 |
|---|---|---|
Intended application | Pressure vessel plate | High-strength low-alloy structural steel—bridges, buildings, heavy structures |
Chemical composition limits | Pressure vessel requirements | Structural steel requirements |
Testing requirements | Pressure vessel requirements | Structural steel requirements |
Code acceptance | Applicable pressure equipment codes | Structural codes |
A572 Grade 50 should not be treated as a direct replacement for A516 Gr.70 without formal engineering review and code approval.
4. How to Choose the Right Grade
Factor | What to Evaluate |
|---|---|
1. Design pressure & temperature | Required material strength and service limits |
2. Plate thickness | Effects of thickness on mechanical properties and toughness requirements |
3. Impact toughness | Whether impact testing is required for the minimum design metal temperature |
4. Welding & forming | Fabrication procedures and any required heat treatment |
5. Code compliance | Whether the selected grade is permitted by applicable construction code |
Our Recommended ASTM A516 Gr.70 Steel Plate Products and Global Shipping Services
Supplies ASTM A516 Gr.70 carbon steel plates for pressure vessels, boilers, and industrial equipment. Buyers should confirm grade, plate thickness, width, length, delivery condition (as-rolled or normalized), mechanical properties, chemical composition, and any required impact or ultrasonic testing. Quality documentation may include Material Test Certificates, tensile and impact test reports, heat-treatment records, dimensional inspection records, and heat-number traceability. A516 Gr.60 and Gr.65 may be considered only when permitted by the design and should not be treated as automatic substitutes. Packaging and export arrangements are confirmed according to plate dimensions, weight, destination port, trade terms, and delivery schedule. To request a quotation, provide the applicable standard, grade, dimensions, quantity, testing requirements, and delivery destination.
Conclusion:
ASTM A516 Gr.70 carbon steel plate is widely used for welded pressure vessels, boilers, and pressure storage equipment in oil and gas, petrochemical, and power generation applications. Correct selection requires confirming the ASTM A516/A516M grade, design pressure, operating temperature, minimum design metal temperature, plate thickness, delivery condition, and impact testing requirements. Buyers should also verify chemical composition, tensile and yield strength, elongation, and toughness. The material must be compatible with planned cutting, forming, and welding procedures, and supported by Material Test Certificates, heat-number traceability, and required inspections. A516 Gr.70 is not interchangeable with structural steels such as ASTM A36 or A572 Gr.50, and A516 Gr.60/65 should only substitute Gr.70 when permitted by the design code.
FAQ:
Q1: What is ASTM A516 Gr.70 steel plate used for?
- It is commonly used to manufacture welded pressure vessels, boilers, storage tanks, separators, and other pressure-containing equipment.
Q2: Is A516 Gr.70 suitable for boiler manufacturing?
- It can be used for specified pressure-containing boiler components when permitted by the applicable design code and project requirements.
Q3: What is the difference between A516 Gr.70 and A36 steel plate?
- A516 Gr.70 is a pressure-vessel-quality carbon steel plate designed for pressure-service applications, while A36 is primarily a general structural steel specification.
Q4: Does ASTM A516 Gr.70 require normalizing?
- Not every plate requires normalizing under all conditions. Heat-treatment requirements depend on plate thickness, applicable ASTM provisions, and the purchase order.
Q5: Does A516 Gr.70 require impact testing?
- Impact testing may be required depending on the design code, minimum design metal temperature, plate thickness, and project specifications.
