First, what are the chemical compositions of 12Cr1MoVR seamless steel pipe?
Carbon: 0.08%~0.15%, Silicon: 0.17%~0.37%, Manganese: 0.40%~0.70%, Phosphorus: ≤0.025%, Sulfur: ≤0.010%, Chromium: 0.90%~1.20%, Molybdenum: 0.25%~0.35%, Vanadium: 0.15%~0.30%.
Second, what are the mechanical properties of 12Cr1MoVR seamless steel pipe?
Tensile strength: ≥490MPa.
Yield strength: ≥245MPa.
Elongation: ≥22%.
Impact energy: ≥71J (0℃).
Brinell hardness: ≤179HBS.
High-temperature performance: Maintains high oxidation resistance and thermal strength even at 580℃, exhibiting excellent durability and plasticity, suitable for long-term high-temperature operation.
Corrosion Resistance: Containing chromium and molybdenum, it maintains good corrosion resistance even in harsh environments such as humidity and acid/alkali conditions, making it suitable for equipment in contact with corrosive media.
Weldability: Good weldability, but preheating to 300℃ is required before welding, and stress relief treatment is necessary after welding to avoid cold cracking and temper brittleness.
Heat Treatment: Usually delivered in a normalized (970℃) + tempered (750℃) state, significantly improving plasticity and impact toughness, and reducing anisotropy.
Third, what are the application areas of 12Cr1MoVR seamless steel pipes?
Power Industry: High-temperature components such as boiler superheaters, reheaters, and headers.
Petrochemical Industry: High-temperature and high-pressure pipelines in catalytic cracking units and hydrocracking units.
Aerospace: High-temperature engine combustion chambers, turbine blades, and other components.
Shipbuilding: Marine boilers, superheaters, and other equipment.
Fourth, what are the sawing guidelines for 12Cr1MoVR seamless steel pipes?
The sawing of 12Cr1MoVR seamless steel pipes requires selecting appropriate processes and equipment based on pipe diameter, wall thickness, and precision requirements to ensure cutting quality and efficiency. The following are specific processing methods and precautions:
Cut Method Selection:
(1) Manual Cutting:
Tools: Hand saw, angle grinder.
Applicable Scenarios: Small diameter, thin-walled seamless steel pipes, occasions where precision requirements are not high.
Advantages: Low cost, simple operation.
(2) Mechanical Cutting:
Tools: Roller-type, hydraulic pipe cutter.
Principle: Cutting the pipe by squeezing or rotating through a mold.
Applicable Scenarios: Mass production, medium wall thickness seamless steel pipes.
Advantages: Smooth cut, high efficiency, suitable for standardized operations.
(3) Flame Cutting:
Tools: Oxyacetylene torch.
Principle: High-temperature flame melts the metal, combined with oxygen to blow away slag to complete the cutting.
Applicable Scenarios: Carbon steel seamless steel pipes with large wall thickness. Advantages: Low cost, suitable for thick-walled steel pipes.
(4) Plasma Cutting:
Tools: Plasma cutting machine.
Principle: High-temperature plasma arc melts the metal, and high-speed gas flow removes the slag.
Applicable Scenarios: High-hardness materials such as stainless steel and alloy steel.
Advantages: High speed, smooth cut, can cut complex shapes.
(5) Laser Cutting:
Tools: Laser cutting machine.
Principle: High-energy laser beam focuses and melts the material, and auxiliary gas blows away the slag.
Applicable Scenarios: Ultra-thin-walled steel pipes, high-precision parts processing.
Advantages: Extremely high precision, burr-free cut.
(6) Control of Cutting Process Parameters:
Cut Speed: Adjusted according to pipe diameter, wall thickness, and material properties to avoid excessive speed leading to a decrease in cut quality.
Preheating Treatment: For thick-walled steel pipes (wall thickness > 50mm), preheating to 150~200℃ is required before cutting to reduce thermal stress and deformation. Cooling Method: Slow cooling is required after cutting to avoid rapid cooling that could cause cracks.
Fifth, what are the cutting operations for 12Cr1MoVR seamless steel pipes?
(1) Cutting Quality Requirements:
Cut Smoothness: The cut should be smooth, free of burrs, cracks, and other defects.
Dimensional Accuracy: Control the cutting dimensional deviation according to design requirements to ensure subsequent assembly accuracy.
Surface Quality: The cut surface should be smooth, free of oxide scale, slag, and other deposits.
(2) Safety Operating Procedures:
Personal Protection: Wear protective equipment such as goggles, gloves, and impact-resistant shoes to avoid injury from sparks or debris.
Ventilation Requirements: Ensure good ventilation during flame or plasma cutting to prevent the accumulation of harmful gases.
Equipment Inspection: Regularly check the cutting equipment (such as the nozzle and power cord) to ensure it is in good working order.
(3) Post-Cutting Treatment:
Grinding and Deburring: Grind the cut to remove burrs and sharp edges, improving surface quality. Non-destructive testing: Ultrasonic or magnetic particle testing is performed on critical components to ensure that the cut surfaces are free of defects such as cracks.
Heat treatment to relieve stress: For thick-walled steel pipes or components requiring high precision, heat treatment is necessary after cutting to eliminate residual stress.
Post time: Jan-20-2026