I.What is Carbon Steel Seamless Pipe?
Carbon Steel Seamless Pipe is a type of pipe made by hot rolling or cold drawing process, named for its weldless construction. It is made from mild steel as the base material and is manufactured through a precise manufacturing process to achieve a uniform wall thickness and smooth inner surface.
This type of steel pipe strikes a balance between strength, pressure resistance, and processing flexibility, making it a core material for petroleum, machinery, construction, and other fields.
II. Why choose carbon steel seamless steel pipe?
(1) Material Composition and Performance Advantages
Composition: Carbon (0.17%-0.24%), silicon (0.17%-0.37%), manganese (0.35%-0.65%) as the main components, supplemented by trace sulfur and phosphorus elements.
Strength performance: tensile strength up to 410MPa, yield strength of about 245MPa, can withstand high pressure and impact loads.
Temperature resistance: Stability is maintained in the range of -20°C to 450°C, and some improved models can be adapted to higher temperatures.
(2) Unique advantages of seamless design
Zero risk of leakage: Weldless construction eliminates weak points in piping systems.
Fluid efficiency: Inner wall smoothness Ra≤12.5μm reduces conveying resistance and saves energy costs.
Processing adaptability: supports cutting, welding, cold bending and other operations, compatible with complex engineering needs.
III. Analysis of the four major rust removal technologies
(1) Pickling method
Applicable scenarios: Batch treatment of surface oxide layers or old coatings.
Note: The acid concentration needs to be controlled (10%-15% hydrochloric acid solution is commonly used), and the residual acid needs to be neutralized after treatment.
(2) Solvent cleaning
Typical solvents: acetone, xylene or special degreasing agent, which can remove more than 90% of oil stains.
Environmental alternatives: Water-based cleaning agents are gradually replacing traditional volatile solvents.
(3) Mechanical grinding
Tool selection:
Hand tools: Suitable for small-scale treatment at the maintenance site (efficiency is about 2-3㎡/hour).
Power tools: When equipped with tungsten steel brush heads, the efficiency can reach 10-15㎡/hour.
(4) Spray (blasting) treatment
Industrial grade standards:
Sa2 grade (commercial grade): 95% of the surface is free of visible impurities.
Sa3 grade (military grade): The original color of the metal is revealed, with a roughness of 40-70μm.
Cost comparison: 30%-50% higher than manual grinding, but the coating life can be extended by 3-5 times.
IV. Industry Applications
(1) Energy Transportation
Shale gas extraction: Use Φ219mm×12mm pipes with a pressure of ≥15MPa.
Refining unit: The feed pipe of the catalytic cracking reactor must withstand a high temperature of 480°C.
(2) Mechanical Manufacturing
Hydraulic system: Cold-drawn precision pipes (tolerance ±0.05mm) ensure the sealing of the cylinder.
Automobile transmission shaft: Using quenching and tempering heat treatment process, the fatigue life exceeds 1 million cycles.
(3) Building structure
Super high-rise building: Large-diameter pipes above Φ500mm are used for wind-resistant support systems.
Cross-sea bridges: Epoxy powder coating + cathodic protection, with a design life of 50 years.
(4) Special fields
Aerospace fuel pipes: Certified by NASM 8625F standard, wall thickness accuracy ±0.01mm.
Nuclear power plant instrument pipes: Meet ASME SA106 Grade B specifications, zero leakage in radiation environment.
V. Selection and Maintenance Guide
(1) Specification Selection Points
Pressure Calculation: Determine the wall thickness according to the ASME B31.3 formula.
Corrosion Allowance: It is recommended to increase the wall thickness compensation by 1.5-3mm in coastal areas.
(2) Long-term Anti-corrosion Solution
Three-layer PE coating: Combination of fused epoxy + FBE adhesive + polyethylene, suitable for buried pipelines.
Hot-dip galvanizing: zinc layer thickness ≥ 85μm, suitable for outdoor structural parts.
(3) Inventory Management Recommendations
Indoor storage: relative humidity is controlled below 50%, and wrapped with VCI anti-rust paper.
Stacking Specifications: Use wooden pallets to isolate the layers, and the stack height should not exceed 3 meters to prevent deformation.
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