SA516 Grade 70 Pressure Vessel Steel

SA516 Grade 70 Pressure Vessel Steel 

ASME SA516 Grade 70 – one GNEE's most popular steel grades, the material is highly sort after for welded fabrication in industrial pressure vessels and boilers.

Used throughout the oil, gas and petrochemical industry the material is a normalized steel with excellent weldability and improved notch toughness i.e. the materials ability to absorb energy when a flaw is present.

"SA516": A grade of carbon steel plates for medium and low temperature pressure vessels in the American ASTM standard.

"Gr70": Stands for Grade 70, meaning the minimum tensile strength is 70 ksi (approximately 485 MPa), which is the highest strength grade in the SA516 series.

Production Process: The production process of SA516Gr70 steel plates includes multiple technological procedures such as steelmaking, continuous casting, hot rolling, controlled rolling, and normalizing. These processes ensure that the steel plates have excellent mechanical properties and metallographic structure, thereby guaranteeing their stability and reliability during use.

Quality Control: During the production process, strict quality control measures such as chemical composition analysis, physical property testing, and non-destructive testing are carried out on the steel plates to ensure that they meet the requirements of relevant standards and specifications. At the same time, the steel plates also need to undergo flaw detection to verify their internal quality.

Petroleum and Chemical Industry:

Equipment such as reactors, heat exchangers, separators, and spherical tanks;

Hydrogen-resistant plates (HIC) are used in H₂S-containing oil and gas field equipment, such as the Puguang Natural Gas Field Project in Sichuan.

Energy and Power Industry:

Boiler drums, nuclear power pressure shells, high-pressure water pipes of hydropower stations;

For low-temperature working conditions (-29℃ to -50℃), S5 impact tests need to be added when placing orders.

Other Fields:

Liquefied gas tanks, gas cylinders, pressure vessel heads, etc.;

Replace imported products and promote the localization process of petrochemical equipment.

SA516Gr70 steel plates have various delivery conditions to meet different customer needs and specific application scenarios. The following is a detailed introduction to the delivery conditions of SA516Gr70 steel plates:

• Main Delivery Conditions

Hot-rolled state:

The steel plates are delivered directly after high-temperature rolling on a hot rolling mill.

Steel plates in the hot-rolled state have a relatively rough surface but good plasticity and toughness, which facilitates subsequent processing and welding.

Controlled rolling state:

During the rolling process, the steel plates obtain specific structures and properties by controlling process parameters such as rolling temperature and reduction.

Steel plates in the controlled rolling state have a more uniform structure and better mechanical properties.

Normalized state:

The steel plates are heated above the critical temperature and then cooled naturally in the air.

Normalizing treatment can eliminate internal stress and structural defects generated during the rolling process of the steel plates, improve their strength and toughness, and enhance their weldability.

• Basis for Selecting Delivery Conditions

The selection of delivery conditions for SA516Gr70 steel plates mainly depends on their service environment and requirements. For example:

For containers that need to withstand high pressure and temperature, steel plates in the normalized state are usually selected to ensure they have good mechanical properties and weldability.

In some occasions where surface quality requirements are not high, hot-rolled or controlled-rolled steel plates may be more economical and practical.

• Special Requirements for Delivery Conditions

In addition to the above common delivery conditions, SA516Gr70 steel plates can also undergo other heat treatment processes according to customers' specific requirements, such as:

Tempering: Used to further eliminate stress and improve the toughness and plasticity of the steel plates.

Simulated post-weld heat treatment: Used to evaluate the performance changes of the steel plates after welding and ensure the quality of welded joints.

• Marking and Acceptance of Delivery Conditions

During the delivery of SA516Gr70 steel plates, their delivery conditions are usually clearly marked, and quality inspection is carried out in accordance with relevant standards and specifications during acceptance. The inspection contents include but are not limited to chemical composition analysis, mechanical property testing (such as yield strength, tensile strength, elongation, etc.), non-destructive testing (such as ultrasonic flaw detection, radiographic flaw detection, etc.), and surface quality inspection.

Contact now

If you want to learn more about GNEE's products, you can send an email to alloy@gneesteelgroup.com. We are more than happy to assist you.

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