A516 Grade 70 vs Grade 60 Steel: Which is Better?

As a leading manufacturer and exporter of pressure vessel and boiler steel plates, GNEE steel supplies high-quality ASTM A516 GR 70 and ASTM A516 GR 60 plates tailored for demanding applications in industries such as oil and gas, petrochemical, and power generation. Choosing between ASTM A516 GR 70 and ASTM A516 GR 60 depends on project requirements for strength, toughness, and cost.

GNEE steel compares their chemical composition, mechanical properties, and applications to help engineers and fabricators make informed decisions.

Chemical Composition Comparison

Both ASTM A516 GR 70 and ASTM A516 GR 60 are carbon steel plates designed for pressure vessels, with controlled compositions to ensure weldability and toughness. The table below outlines their chemical compositions per ASTM standards:

Key Differences:

• Carbon: ASTM A516 GR 70 has a higher carbon content (0.27% max) than ASTM A516 GR 60 (0.21% max), contributing to greater strength but slightly reduced ductility.
• Manganese: GR 70 has a higher minimum manganese content (0.85% vs. 0.60%), enhancing strength and toughness.
• Phosphorus and Sulfur: Both grades maintain low levels (0.035% max) for improved notch toughness.
• Aluminum: Both are fully killed steels, ensuring uniform properties and reduced gas inclusions.

GNEE steel ensures that both ASTM A516 GR 70 and ASTM A516 GR 60 meet ASME SA516 GR 70 and ASME SA516 GR 60 standards, with rigorous chemical testing.

Mechanical Properties Comparison

The mechanical properties of ASTM A516 GR 70 and ASTM A516 GR 60 determine their suitability for specific applications. GR 70 offers higher strength, while GR 60 provides greater ductility. The table below compares their key mechanical properties:

Key Differences:

• Tensile Strength: ASTM A516 GR 70 (485–620 MPa) is stronger than ASTM A516 GR 60 (415–550 MPa), making it suitable for higher-pressure applications.
• Yield Strength: GR 70’s higher yield strength (260 MPa vs. 220 MPa) provides better resistance to deformation under pressure.
• Elongation: GR 60 offers higher ductility (21–25% vs. 17–21%), ideal for applications requiring extensive forming.
• Impact Toughness: GR 60 is tested at a lower temperature (-51°C vs. -46°C), offering slightly better low-temperature performance.

Applications

• ASTM A516 GR 70: Preferred for:
  • High-pressure vessels in oil, gas, and chemical processing.
  • Boilers in power generation requiring robust strength.
  • Cryogenic applications like LNG storage tanks.
• ASTM A516 GR 60: Suited for:
  • Moderate-pressure vessels where cost and formability are priorities.
  • Boilers and tanks requiring high ductility for fabrication.
  • Low-temperature applications with less stringent strength requirements.

GNEE steel’s ASME SA516 GR 70 and ASME SA516 GR 60 plates meet ASME standards, ensuring reliability for pressure vessel and boiler applications.

Weldability

Both grades are fully killed carbon steels with excellent weldability using standard processes (SMAW, GTAW, SAW). However:

• ASTM A516 GR 70: Higher carbon content requires careful welding to avoid hardness issues, but normalization enhances weld quality.
• ASTM A516 GR 60: Lower carbon content simplifies welding, reducing the risk of cracking.

GNEE steel supplies both grades in normalized conditions to optimize weldability and toughness.

Which is Better?

• Choose ASTM A516 GR 70 for:
  • High-pressure vessels requiring superior strength.
  • Applications where robustness outweighs cost considerations.
  • Projects needing compliance with stringent standards like ASME SA516 GR 70.
• Choose ASTM A516 GR 60 for:
  • Moderate-pressure applications where cost and formability are priorities.
  • Projects requiring higher ductility for complex fabrication.
  • Low-temperature environments with less demanding strength requirements.

We can supply

• Thickness from 3mm to 150mm
• Width: from 1,500mm to 2,500mm
• Length: from 6,000mm to 12,000mm

Technical conditions

• Ultrasonic tested as per SA 578 or any other as per requirement
• MTC acc to EN 10204 / 3.2
• Charpy Impact tested at -20°C / -29°C / – 46°C.
• Heat Treatment : Rolled / Normalised / N+T QT
• BQ Plates with IBR form IV
• Production: Hot Rolled

Summary

Chemical Composition Grade 70 has a higher carbon and manganese content compared to Grade 60 and Mechanical Properties Grade 70 has higher tensile and yield strength than Grade 60 and Applications While both are used in similar applications, Grade 70 is chosen when higher strength is needed and Both grades offer excellent weldability and are commonly used in the oil, gas, and petrochemical industries for making boilers and pressure vessels.

ASTM A516 Grade 60 / ASTM A516 Grade 70 – Chemical Requirements

ASTM A516 Grade 60 / ASTM A516 Grade 70 – Tensile Steel Requirements

Equivalent Specifications and Standards of ASTM A516 Grade 60 / ASTM A516 Grade 70

ASTM A516 GRADE 60 / 70 Steel Plates Export Country

We export ASTM A516 Grade 60 / 70 Plates to Saudi Arabia, Iran, Iraq, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen, Syria, Israel, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Myanmar, Taiwan, Cambodia, Argentina, Bolivia, Brazil, Chile, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Costa Rica, Puerto Rico, Trinidad And Tobago, Jamaica, Bahamas, Denmark, Russia, Norway, Germany, France, Italy, United Kingdom, Spain, Ukraine, Netherlands, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Switzerland, Slovakia, Finland, Ireland, Croatia, Slovenia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Equatorial Guinea, The Republic Of Congo, Gabon, Europe, Africa, Asia, North America, South America, Middle East, Far East.etc.