A662 Grade C is a carbon-manganese steel plate specified by ASTM standards, mainly used for pressure vessels and low-temperature service. It has good toughness and weldability, suitable for moderate pressure and low-temperature environments.
ASTM A662 Chemical Composition:
| Steel Grade | ASTM A662 Chemical Composition Max (%) | ||||||
|---|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | Al | N | |
| Grade C | 0,24 | 0.13-0.55 | 0.92-1.72 | 0.035 | 0.035 | - | - |
ASTM A662 Mechanical Property:
| Steel Grade | ASTM A662 Mechanical Property | |||
|---|---|---|---|---|
| Thickness | Yield | Tensile | Elongation | |
| Grade C | 6-50 | 295 | 480-620 | 22% |
| 50-200 | 295 | 480-620 | 18% | |
ASTM A662 Equivalent Steel Grade:
| ASTM | EN10028 | JIS | ISO |
|---|---|---|---|
| A662-C | - | G3115-SGV315 | P315 |
Processes Adopted for A662 Grade C
Smelting Process:
Adopts electric arc furnace (EAF) or basic oxygen furnace (BOF) smelting process, combined with ladle refining (LF) technology. Strictly controls the content of carbon, manganese, silicon and harmful impurities (sulfur, phosphorus) to ensure chemical composition uniformity and purity of the steel, laying a foundation for excellent mechanical properties.
Rolling Process:
Applies controlled rolling and controlled cooling (CRCC) technology. The steel billet is heated to a suitable temperature (1100-1250℃) for hot rolling, and the rolling speed, pressure and cooling rate are precisely controlled during the process. This improves the grain refinement of the steel plate, enhances its strength and toughness, and ensures the uniformity of thickness and surface quality.
Heat Treatment Process:
Undergoes normalizing heat treatment as the core process. The steel plate is heated to 890-950℃ and kept at a constant temperature for a certain period, then cooled in air. This process optimizes the microstructure (converts to fine pearlite and ferrite), eliminates internal stress, and further improves low-temperature toughness and mechanical stability.
Welding Process:
Commonly adopts shielded metal arc welding (SMAW), gas metal arc welding (GMAW) and submerged arc welding (SAW) processes. Before welding, preheating (50-100℃) is required to prevent cold cracks; post-weld heat treatment (PWHT) such as stress relief annealing is performed to eliminate welding residual stress and ensure the reliability of weld joints.
Surface Treatment Process:
For equipment application scenarios, surface treatment processes such as shot blasting, pickling and passivation are adopted. These processes remove oxide scales and impurities on the surface, improve corrosion resistance, and provide a good foundation for subsequent anti-corrosion coating (if needed).
A662 Grade C Applications
Petrochemical Industry: As a specialized steel for medium and low-temperature pressure vessels, it is primarily utilized in manufacturing critical equipment including reactors, heat exchangers, separators, spherical storage tanks, as well as oil, gas and liquefied petroleum gas (LPG) storage tanks. It maintains stable operation at -30℃ and above, effectively resisting medium pressure and corrosion, thus guaranteeing the safe and reliable operation of petrochemical production processes.
Power Energy Industry: It is well-suited for the fabrication of high-temperature and high-pressure equipment such as power station boiler drums and nuclear reactor pressure vessels. Capable of withstanding alternating high and low-temperature operating conditions, it ensures the structural integrity and long-term safe service of equipment in thermal power, nuclear power and other power generation processes by virtue of its excellent strength and fatigue resistance.
Low-Temperature Storage and Transportation Field: It is employed in manufacturing storage and transportation containers for low-temperature media like liquid ammonia, liquid nitrogen and liquefied petroleum gas (LPG). Adaptable to operating environments ranging from -20℃ to -45℃, it meets the stringent requirements of low-temperature storage and transportation for material toughness and sealing performance.
Water Conservancy and Hydropower Field: It is applicable for processing pressure-bearing components such as high-pressure water pipes and water turbine volutes in hydropower stations. Even in low-temperature water environments, it retains excellent mechanical properties, ensuring the stable and reliable operation of water conservancy and power generation facilities.
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What is the maximum operating temperature of A662 Grade C?
The maximum continuous operating temperature of A662 Grade C is about 425°C (800°F). Beyond this temperature, its strength and toughness will decrease significantly.
Does A662 Grade C have any notch sensitivity?
It has low notch sensitivity, especially at low temperatures. The Charpy V-notch impact test confirms that it can resist fracture even with notches in the structure.
What is the melting point of A662 Grade C?
The melting point range of A662 Grade C is 1420-1460°C (2588-2660°F), similar to other carbon-manganese steels, which is important for welding and heat treatment processes.
What is the density of A662 Grade C?
The density of A662 Grade C is approximately 7.85 g/cm³, the same as most carbon and low-alloy steels, which is a key parameter for weight calculation in engineering design.
What corrosion resistance does A662 Grade C have?
It has general corrosion resistance in atmospheric and mild chemical environments. For harsh corrosive conditions, additional anti-corrosion treatments (e.g., painting, galvanizing) are required.
Can A662 Grade C be cold-formed?
Yes, it can be cold-formed under appropriate conditions. However, excessive cold working may reduce toughness, so post-forming heat treatment may be needed for critical components.
What surface treatments are applicable to A662 Grade C?
Common surface treatments include shot blasting, pickling, phosphating, painting, and galvanizing. These treatments improve corrosion resistance and surface quality for different service environments.
What is the difference between A662 Grade C and A516 Grade 60?
A662 Grade C is for low-temperature service with better toughness, while A516 Grade 60 is for general pressure vessels. A516 Grade 60 has higher strength but lower low-temperature toughness.
What quality control measures are taken for A662 Grade C production?
Production quality control includes raw material inspection, melting process monitoring, rolling process control, heat treatment verification, and final mechanical and chemical testing to meet ASTM standards.