Overview
Low alloy heat resistant steel plate is engineered to withstand high temperatures while maintaining structural integrity. It contains alloying elements such as chromium, molybdenum, and vanadium, which enhance its thermal stability and mechanical strength. This material is indispensable in industries where components are exposed to prolonged heat, such as power generation and petrochemical processing. Compared to carbon steel, low alloy heat resistant steel offers superior creep resistance, reducing deformation under stress at elevated temperatures. Its development has been driven by the need for safer and more efficient high-temperature industrial applications.
Physical and Chemical Properties
The steel’s key properties include high tensile strength (typically 450-620 MPa) and excellent oxidation resistance up to 600°C. Its alloy composition (e.g., 1-3% chromium, 0.5-1% molybdenum) forms stable oxides that protect against scaling. The material also exhibits good weldability and machinability, though preheating may be required to avoid cracking. Density is comparable to standard steel (~7.85 g/cm³), but its thermal expansion coefficient is marginally lower, reducing thermal stress. Creep rupture strength—a critical metric for high-temperature performance—is rigorously tested to ensure compliance with industry standards like ASTM A387.
Main Applications
This steel is primarily used in boilers and pressure vessels, where it contains high-pressure steam or gases at temperatures exceeding 500°C. Power plants rely on it for turbine casings and superheater tubes. Petrochemical facilities employ it in reactors and piping systems handling hot hydrocarbons. Other applications include industrial furnaces, heat exchangers, and exhaust systems. Its durability under cyclic thermal loading makes it ideal for components subjected to frequent heating and cooling, minimizing maintenance downtime.
Safety and Storage
Handle with gloves and eye protection to prevent cuts from sharp edges. Machining generates fine dust; use local exhaust ventilation or respirators. Store plates horizontally on wooden pallets to avoid moisture absorption and surface damage. Long-term exposure to humid environments may cause superficial rust, which can be removed via sandblasting. For welding, adhere to preheating protocols (e.g., 150-200°C for Grade 11 steel) to prevent hydrogen-induced cracking.
B2B Procurement Guide
When sourcing, prioritize suppliers with ISO 9001 certification and mill test reports (MTRs) validating chemical composition and mechanical properties. Specify dimensions (thickness, width) and alloy grade (e.g., ASTM A387 Gr.11, Gr.22). Bulk orders (10+ tons) often qualify for discounts. Lead times vary; confirm stock availability for urgent projects. Consider logistics—plates are heavy and may require specialized transport. For reference, prices range from $800 to $2,500 per ton, depending on market conditions and alloy content.
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