What standard does SA662 Grade C comply with?

SA662 Grade C is a low-alloy carbon steel plate specified by ASTM/ASME standards. It is mainly used for pressure vessels and structural components, featuring good weldability, moderate strength and toughness, suitable for low-temperature service environments.

Processing

SA662 Grade C features feasible and standardized processing properties, with core processing procedures and requirements as follows:

Cutting: Suitable for flame, plasma and laser cutting; preheat to 50-100℃ for thick plates (≥25mm) to avoid cold cracking, and remove slag and burrs post-cutting.

Forming: Adopt cold or hot forming; cold forming shall control bending radius to prevent excessive plastic deformation, and hot forming temperature is controlled at 900-1100℃ with slow cooling to retain toughness.

Welding: Use low-hydrogen welding methods (SMAW/GTAW/GMAW); match with E7018/E71T-1 welding materials, implement preheating and post-weld heat treatment as required to ensure joint performance consistent with base metal.

Machining: Good machinability for turning, milling and drilling; select sharp cutting tools and moderate cutting parameters to avoid work hardening and surface damage.

Heat Treatment: Normally supplied in normalized condition (880-920℃, air cooling); tempering can be done as needed to adjust hardness and eliminate internal stress from processing.

Applications

Petrochemical Industry: Fabricates low-temperature pressure vessels, storage tanks and pipelines for ethylene, propylene and other petrochemical intermediates, resisting brittle fracture in low-temperature environments.

Liquefied Gas Handling: Manufactures storage and transportation equipment for LNG, LPG and other cryogenic media, adapting to working temperatures of -40℃ and below.

Cryogenic Processing: Produces cryogenic separators, coolers and heat exchangers for air separation plants and refrigeration systems, ensuring stable long-term operation.

Marine & Offshore Engineering: Makes low-temperature-resistant structural parts and pressure components for offshore platforms and LNG transport ships, adapting to harsh marine environments.

Power Industry: Fabricates low-temperature auxiliary equipment for thermal and nuclear power plants, meeting strict safety and performance requirements.

Petrochemical Industry: It is used to fabricate low-temperature pressure vessels, such as storage tanks and pipelines for ethylene, propylene and other low-boiling petrochemical intermediates. These components need to maintain structural integrity in low-temperature working environments to avoid brittle fracture caused by medium cooling.

Liquefied Gas Handling: It is applied in the manufacturing of storage and transportation equipment for liquefied natural gas (LNG), liquefied petroleum gas (LPG) and other cryogenic media, including tank bodies, pipe fittings and support structures, which can withstand the low temperature of -40℃ and below.

Cryogenic Processing Equipment: It is used to produce cryogenic separators, coolers and heat exchangers in air separation plants and refrigeration systems. These devices need to resist the erosion of low-temperature media and ensure stable operation for a long time.

Marine and Offshore Engineering: It is used to make low-temperature-resistant structural parts and pressure components of offshore platforms and LNG transport ships, adapting to the harsh low-temperature marine environment and ensuring the safety of marine operations.

Power Industry: It is applied in the fabrication of low-temperature auxiliary equipment for thermal power plants and nuclear power plants, such as low-temperature flue gas treatment devices and cryogenic storage tanks for auxiliary media, meeting the strict safety and performance requirements of the power industry.

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Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.

Does SA662 Grade C require impact testing?

Yes, SA662 Grade C requires Charpy V-notch impact testing. The minimum impact energy is 27 J (20 ft-lb) at -29°C (-20°F), ensuring the material has sufficient toughness in low-temperature environments.

What is the maximum thickness of SA662 Grade C plates usually supplied?

SA662 Grade C plates are usually supplied with a maximum thickness of 150 mm (6 inches). Thicker plates may require special heat treatment and inspection to ensure uniform mechanical properties throughout the thickness.

What is the density of SA662 Grade C?

The density of SA662 Grade C is approximately 7.85 g/cm³ (0.284 lb/in³), which is the same as that of ordinary carbon steel, facilitating weight calculation in structural design and manufacturing.

Can SA662 Grade C be used in high-pressure applications?

SA662 Grade C is suitable for medium and low-pressure applications. For high-pressure environments, it needs to be evaluated based on specific pressure levels, temperatures, and service conditions, and may require higher-grade materials in some cases.

What is the hardness requirement of SA662 Grade C?

SA662 Grade C generally has a Brinell hardness (HB) of ≤197. This moderate hardness balances machinability and wear resistance, making it easy to process into various components.

What surface treatments are suitable for SA662 Grade C?

Suitable surface treatments for SA662 Grade C include sandblasting, pickling, phosphating, painting, and galvanizing. These treatments improve corrosion resistance and surface finish, extending the service life of the material.

Is SA662 Grade C magnetic?

Yes, SA662 Grade C is a ferromagnetic material. It has magnetic properties due to its iron-based composition, which can be used in magnetic testing and related applications, but may not be suitable for non-magnetic environment requirements.

What is the difference between SA662 Grade C and SA662 Grade A?

The main difference lies in strength: SA662 Grade C has higher tensile and yield strengths than Grade A. Both have similar weldability and low-temperature toughness, but Grade C is used for more demanding load-bearing applications.

Can SA662 Grade C be machined easily?

Yes, SA662 Grade C has good machinability. It can be processed by turning, milling, drilling, and other common machining methods with appropriate cutting tools and parameters, ensuring high processing efficiency and surface quality.

What is the corrosion resistance of SA662 Grade C?

SA662 Grade C has moderate corrosion resistance in atmospheric and mild corrosive environments. In harsh environments such as strong acids, alkalis, and saltwater, additional anti-corrosion treatments (e.g., painting, coating) are required to prevent corrosion.