ASTM A515 Grade 70

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Description

Steel for pressure vessels and boilers differ from other carbon-manganese structural steels due to their high resistance to pressure at all temperatures (ambient, low or high).

The fundamental property of steels for pressure vessels is their ability to withstand high pressure at different temperatures. They have good weldability, as well as excellent toughness, and are suitable for normalisation annealing and stress-relief annealing (both treatments neutralise local hardening caused by welding).

This material data has been provided by ArcelorMittal.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

Mechanical

PropertyValueComment

Elongation

17 %

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min. | for thickness 5-80 mm | A8 | Transverse

21 %

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min. | for thickness 5-80 mm | A2 | Transverse

Tensile strength

485 - 620 MPa

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for thickness 5-80 mm | Transverse

Yield strength

260 MPa

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min. | for thickness 5-80 mm | Transverse

Chemical properties

PropertyValueComment

Carbon

0.31 %

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max. | for thickness 5-25 mm

0.33 %

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max. | for thickness 25-50 mm

0.35 %

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max. | for thickness 50-80 mm

Manganese

1.2 %

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max. | for thickness 5-80 mm

Phosphorus

0.025 %

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max. | for thickness 5-80 mm

Silicon

0.15 - 0.4 %

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for thickness 5-80 mm

Sulfur

0.025 %

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max. | for thickness 5-80 mm

Technological properties

Property
Application areas

Steel for pressure vessels are mainly used to manufacture boilers, drums, pressure or steam piping, industrial thermal vessels and heat exchangers. These steels are suitable for mechanical forming and welding.

Delivery condtion

For the dimensions available please visit Dimension tables (see Table A).

Other

Available options

Options available (after previous agreement):

  • Vacuum degassing
  • Austenitic grain size
  • Product analysis
  • PWHT on test specimens
  • Charpy impact test
  • High temperature tensile test
  • Ultrasonic testing
  • Bending test