ASTM A516 Gr.70N pressure vessel steel plate
High impact-resistant sheet specially designed for the petroleum, chemical and boiler industries
When purchasing A516GR70N pressure vessel steel plates, the buyers are most concerned about not getting materials with inconsistent performance, which may cause cracking during welding or fail to meet the impact toughness requirements in low-temperature environments.
Today, what I am presenting to you is not merely A516GR70N steel plates that comply with ASTM standards, but also a solution specifically designed for "as-forged state" and "sulfur-hydrogen resistant environment". Whether you need to build large LNG storage tanks or export them to the Middle East for high-sulfur oil and gas equipment, our products can provide you with traceable quality assurance.
"Also called A516 Gr70, what are the differences for you?"
The key lies in "N (normalizing)" and "hydrogen-induced cracking (HIC) resistance performance"
A simple explanation of "N" (normalizing)
If the ordinary A516 Gr70 is not subjected to normalizing treatment, the "veins" (crystalline structure) inside it may become disordered. Our A516GR70N has undergone strict heat treatment in a normalizing furnace, which brings two major benefits:
Eliminating internal stress: During laser cutting or trimming, the sheet material is less likely to deform.
Grain refinement: Just as fine sand is denser than coarse sand, the refined grains enable the steel plate to maintain its toughness even at low temperatures.
Anti-hydrogen-induced cracking (HIC) performance
We can provide HIC (hydrogen-induced cracking) and SSC (sulfide stress corrosion) inspection reports. Through strict control of impurities and special micro-alloying treatment, the crack sensitivity rate (CSR) of our steel plates is nearly zero in the NACE standard solution tests.
Guarantee of quality
From steelmaking to rolling, each steel plate has its own furnace number. Just like a person's ID card, through the furnace number, one can find out when it was produced and what its specific chemical composition is.
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Name: Special Carbon Steel Plate for Medium/Low Temperature Pressure Vessels
Standard: ASTM A516 / ASME SA-516 (dual certification)
Suffix Explanation (Key Explanation): The "N" represents Normalized (heat treatment). In simple terms, it's like the "exercise training" for steel. Through normalization, the internal grains of the steel become finer and more evenly distributed, and it is less prone to brittleness at low temperatures.
01
Standard specification range
Thickness: 8mm - 150mm (Note: Above 150mm is considered a very thick plate. Pricing will be negotiated upon request.)
Width: 1500mm - 4000mm
Length: 6000mm - 18000mm
Delivery status: Normalizing (N) - This is the key point we emphasize and it is the core value of the "N" symbol.
02
Chemical composition
Carbon (C): ≤0.30% -- Weld-friendly design. The carbon content is strictly controlled, which means that during on-site welding, you are less likely to encounter cracks and can reduce the cost of rework.
Sulfur (S) & Phosphorus (P): ≤0.035% (can be lower) - Ensures purity. Sulfur is like an "impurity" in steel. The lower the level is controlled, the more reliable the sheet will be during subsequent stretching and forming processes.
03
Mechanical properties
Tensile strength: 485 - 620 MPa (equivalent to approximately 5 tons of tensile force per square centimeter before breaking)
Yield strength: ≥ 260 MPa
Impact toughness: This is the strength of the N series! We usually guarantee -30℃ or even -46℃ low-temperature impact (longitudinal/vertical), with a value of 34J or above, ensuring that the equipment remains sturdy in cold regions.
Quality Assurance
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Authoritative testing and certification
EN 10204 3.2 Type Approval (certificates issued by authoritative third-party institutions such as BV, SGS, Lloyd's).
Authoritative testing and certification
Ultrasonic testing: Internal defects can be inspected according to the SA-578 C or E standards to ensure that there are no tiny "cracks" or "pores" inside the steel plate.
Authoritative testing and certification
Batch impact test: We not only conduct tests on a single board, but also support conducting batch drop-weight tests to ensure stable performance in batches.
Packaging and Logistics
Surface treatment: The default state is black matte finish. It can be treated with sandblasting or painted with primer as per requirements to prevent rusting during long-distance shipping.
Transportation suggestion: For extremely wide and thick plates, provide detailed packing or bulk carrier loading recommendations to ensure the safe arrival of the goods.
Application scenario analysis
Faster - it will select the appropriate materials for you
Desert oil fields in the Middle East
The customer needs to order a batch of desulfurization towers and oil-gas separators.
Due to the high sulfur content in the local crude oil, ordinary container plates may corrode and become unusable within 3 to 5 years. Our A516GR70N (HIC) has outstanding anti-sulfur performance and has been chosen as the preferred option for this project, helping the owner extend the lifespan of the equipment.
Russia's liquefied natural gas project
In an extremely cold environment of around minus 40 degrees Celsius, ordinary carbon steel would shatter upon impact.
After undergoing normalizing treatment, A516GR70N maintains excellent low-temperature impact toughness, which is used to manufacture propane storage tanks and heat exchanger shells, ensuring safe operation in icy and snowy conditions.
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Why contact us now?
Ready stock: Common thicknesses (8mm - 50mm) have a stockpile of over 2,000 tons, and cutting and retailing services are supported.
Direct supply from steel mills: We have long-term agreements with the front-line steel mills, ensuring competitive prices and guaranteed delivery times.
Customized service: Whether it's fixed-length cutting or special performance (HIC) requirements, a single email will provide a technical response.
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FAQ
01.What is the minimum order quantity (MOQ) and lead time for ASTM A516 Gr70N steel plates?
02.Why does A516 Grade 70 need to be ordered in "Normalized" (N) condition?
While ASTM A516 allows for "As-Rolled" condition for thinner plates, ordering A516 Gr70N guarantees the steel has undergone Normalizing heat treatment. This process refines the grain structure, which is critical for:
Stable Impact Toughness: Ensuring reliable performance at low temperatures (e.g., -30°C or -46°C).
Uniformity: Eliminating internal stresses for better welding and forming.
Most pressure vessel designs specifically mandate the "N" condition for safety.
03.Can you supply A516 Gr70N with HIC (Hydrogen Induced Cracking) test reports for sour service applications?
We achieve this through strict control of chemistry (low S, P) and special rolling techniques. We can provide a 3.2 type inspection certificate issued by a third party (such as SGS or BV) confirming the plates are suitable for sour service environments.
04.What types of certifications and mill test certificates (MTC) do you provide?
Mill Test Certificate (MTC): As per EN 10204 2.2 or 3.1.
Third-Party Inspection: Available as per EN 10204 3.2 (Lloyd's, DNV, BV, etc.).
UT Test: Ultrasonic examination reports according to SA-578 Level C or E.
Reports: Heat treatment charts and impact test reports are included.
05.Is pre-heating required before welding A516 Gr70N, and do you offer cutting services?
Yes, we offer value-added services: We can supply plates ready-to-use with CNC cutting, bevelling, and even flattening to help you reduce scrap and production time.
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