A662GrB is a high-quality low-carbon, high-strength pressure vessel steel grade officially defined by the American Society for Testing and Materials (ASTM) under standard ASTM A662/A662M. It is specifically engineered and widely employed in manufacturing low-temperature pressure vessels, storage tanks, and critical structural components across industries where cold resistance is of utmost importance. This steel grade boasts excellent low-temperature toughness, reliable weldability, and stable mechanical properties, even when serving in harsh low-temperature operating environments.
Chemical Composition
|
Grade/ Material |
Element |
Composition( Max-A, Min-I) |
|
A662 Grade B/ A662 GrB |
C |
A:0.19 |
|
Mn |
0.85-1.50 |
|
|
Si |
0.15-0.40 |
|
|
P |
0.035 |
|
|
S |
0.035 |
Mechanical Properties
|
Grade/ Material |
Tensile Test |
MPa |
|
A662 Grade B/ A662 GrB |
Tensile Strength |
450-585 |
|
Yield Strength |
275 |
|
|
Elongation |
20% |
|
|
Impact Test( if any) |
applications
1. Low-Temperature Pressure Vessels
The primary application for A662GrB is the fabrication of high-integrity pressure vessels designed to operate in sub-zero conditions.
Operational Range: It maintains structural integrity at temperatures as low as -40°C to -60°C, preventing the ductile-to-brittle transition that causes failure in standard carbon steels.
Manufacturing Use: It is commonly used for boiler plates and heat exchangers in oil and gas projects that require consistent performance under varying thermal loads.
Compliance: Vessels built with A662GrB typically meet ASME Section VIII standards for safe operation under internal or external pressures exceeding 15 psig.
2. Specialized Storage Tanks
A662GrB is used for industrial containers that store volatile substances requiring stable, pressurized, or refrigerated environments.
Petrochemical Storage: Used for spherical and vertical tanks storing Liquefied Petroleum Gas (LPG), Compressed Natural Gas (CNG), and other volatile petrochemicals.
Industrial Fluids: It is a preferred material for storing boiler feedwater, condensate, and emergency fuels in power plants.
Standards: These tanks are often designed to API 620 (large, welded, low-pressure storage tanks) and API 650 (welded steel tanks for oil storage) specifications.
3. Energy and Industrial Infrastructure
Beyond simple containment, A662GrB supports critical infrastructure that must withstand extreme environmental and mechanical stresses.
Offshore and Polar Engineering: Because of its enhanced manganese content and fine-grain structure, it is used for structural components in cold-region marine engineering, such as offshore platforms and jack-up rigs.
Hydrogen Infrastructure: With the rise of sustainable energy in 2026, low-alloy steels like A662GrB are increasingly evaluated for ground storage vessels at Hydrogen Refueling Stations (HRS) due to their balance of tensile strength and price, provided they undergo rigorous fatigue testing for hydrogen compatibility.
Mechanical Integrity: It is utilized for industrial machinery and bridge construction where high yield strength (typically 275 MPa) and weldability are required for heavy-duty load-bearing.
application conditions
Service Temperature Range: A662 GrB is typically applied in environments ranging from ambient temperatures down to approximately −45°C. It is not intended for cryogenic service below this range, but it provides reliable toughness for many low‑temperature processing and storage duties.
Pressure Requirements: It is used in pressure vessels and components operating under moderate to high internal pressures, as specified in ASME Boiler and Pressure Vessel Code applications. The material's strength and ductility make it suitable for boilers, heat exchangers, and process vessels subject to cyclic pressure loading.
Welding and Fabrication Conditions: A662 GrB is widely used under conditions requiring extensive welding and forming. Its good weldability allows it to be used in fabrications involving multiple weld joints, such as large storage tanks and pressure vessel shells, without preheating in many cases, though specific procedures depend on thickness and service environment.
Corrosion and Media Compatibility: It is applied in services involving mildly corrosive or non‑corrosive media, including water, steam, oil, and some chemical process fluids. Where aggressive corrosion is expected, additional protection such as coatings or linings is typically required.
Structural and Environmental Conditions: The material is used in both indoor and outdoor installations, including refineries, chemical plants, and power generation facilities. It is suitable for applications where structural integrity under thermal and mechanical stress is essential, particularly in regions with cold climates.
processing
Heating and Rolling: The steel is heated to a suitable temperature range for hot rolling to achieve uniform microstructure and mechanical properties. Controlled rolling practices help refine the grain size, which contributes to improved toughness, especially at lower temperatures.
Normalization: A662 GrB is often normalized to enhance strength and toughness. Normalization involves heating the steel to the appropriate temperature, holding it for a sufficient time to ensure uniformity, and then cooling it in air. This process refines the ferrite‑pearlite structure and improves dimensional stability.
Quenching and Tempering (Q&T): While A662 GrB is commonly supplied in the normalized condition, some applications may use quenched and tempered material for higher strength. Q&T involves rapid cooling after heating followed by tempering to balance strength and toughness, ensuring good performance under demanding pressure and temperature conditions.
Welding Conditions: A662 GrB exhibits excellent weldability, allowing use with common welding processes such as SMAW, GMAW, FCAW, and SAW. Preheating may be required for thicker plates or in cold environments to prevent hydrogen‑induced cracking, and post‑weld heat treatment (PWHT) is often applied to reduce residual stresses and improve toughness in welded joints.
Forming and Machining: The material can be readily formed using standard hot or cold forming techniques. Machinability is good, though appropriate cutting tools and speeds are recommended to maintain surface quality and dimensional accuracy in pressure vessel components.
Why Choose Us :
You can get the perfect material according to your requirement at the least possible price.
We also offer Reworks, FOB, CFR, CIF, and door to door delivery prices. We suggest you to do deal for shipping which will be quite economical.
The materials we provide are completely verifiable, right from raw material test certificate to the final dimensional statement.(Reports will show on requirement)
We guarantee to give a response within 24hours(usually in the same hour)
You can get stock alternatives, mill deliveries with minimizing manufacturing time.
We are fully dedicated to our customers. If it will not possible to meet your requirements after examining all options, we will not mislead you by making false promises which will create good customer relations.
If you have project requirements for A662GrB, we welcome your inquiry. GNEE maintains a large inventory of commonly used high strength steel grades for your selection.For detailed mechanical properties, chemical composition, and technical data, as well as free samples, please contact our factory immediately. We offer competitive prices, stable quality, and professional service. Email:beam@gneesteelgroup.com.
What is the minimum tensile strength of A662GrB?
The minimum tensile strength of A662GrB is 415 MPa (60 ksi), as specified in the ASTM A662/A662M standard. This ensures it has sufficient strength for pressure vessel and structural applications.
What is the minimum yield strength of A662GrB?
A662GrB has a minimum yield strength of 240 MPa (35 ksi). This yield strength level makes it suitable for withstanding mechanical loads and pressure in various low-temperature working conditions.
What is the melting point range of A662GrB?
The melting point range of A662GrB is approximately 1450-1510°C (2642-2750°F), similar to other low-carbon steels. This range is important for welding and heat treatment process design.
What is the density of A662GrB?
The density of A662GrB is about 7.85 g/cm³ (0.283 lb/in³), which is the standard density for carbon and low-alloy steels. This value is used for weight calculation in engineering design.
What is the recommended welding method for A662GrB?
Common recommended welding methods for A662GrB include shielded metal arc welding (SMAW), gas metal arc welding (GMAW), and submerged arc welding (SAW). Proper preheating and post-weld heat treatment are advised.
What is the hardness requirement for A662GrB?
The hardness of A662GrB is usually not specified in the standard but is typically around 120-160 HB (Brinell Hardness) in the as-rolled condition. Hardness testing may be required for quality control.
What is the thermal conductivity of A662GrB?
At room temperature, the thermal conductivity of A662GrB is about 45 W/(m·K) (26 Btu/(ft·h·°F)). This property is crucial for thermal design in high-temperature or low-temperature applications.
What is the coefficient of thermal expansion of A662GrB?
The linear coefficient of thermal expansion of A662GrB is approximately 11.7 × 10⁻⁶/°C (6.5 × 10⁻⁶/°F) between 0-100°C (32-212°F), used for thermal stress calculation in engineering.
What is the maximum thickness of A662GrB plates usually supplied?
A662GrB plates are usually supplied with a maximum thickness of 150 mm (6 inches), depending on the manufacturer's capabilities. Thicker plates may require special processing to maintain mechanical properties.