1.How to choose the material of round rod according to the degree of environmental corrosion?
Normal atmospheric environment: The galvanized layer can meet the anti-corrosion requirements, and Q235/Q345 (low cost) is preferred. Wet/mild corrosion (such as rain, moisture): Q345 galvanized (slightly better in atmospheric corrosion resistance) or 304 stainless steel galvanized (longer corrosion resistance).
Strongly corrosive environment: Seawater/salt spray: 316 stainless steel (containing Mo, resistant to chloride ion corrosion);
Acid and alkali media: 316 stainless steel (acid resistant) or Teflon-coated galvanized parts (very few extreme scenarios).
2.How to choose the material of galvanized round rod according to the adaptability of processing technology?
Welding requirements: For frequent welding, choose Q235 (low carbon content, excellent weldability), avoid 45# steel (needs preheating to prevent cracking).
Heat treatment requirements: For quenching and strengthening, choose 45# steel or 20CrMnTi (hardness can be improved by carburizing/tempering), stainless steel (304/316) is generally not heat treated.
Cold forming: 304 stainless steel has good plasticity and is suitable for bending and stamping (such as kitchen utensils); Q235 is second, and Q345 is slightly more difficult to cold form.
3.What are the galvanized round bar materials with high cost and performance ratio?
Low-cost scenarios: Q235, Q345, suitable for construction and general machinery.
Medium- and high-cost scenarios: 45# steel, 20CrMnTi, used for mechanical parts.
High-cost scenarios: 304 stainless steel, 316 stainless steel, only used in scenarios with rigid corrosion resistance requirements.
4.What are the usage scenarios of galvanized round bars in the construction engineering field?
Scenarios: Scaffolding, steel structure support
Requirements: Static load, outdoor atmospheric environment, welding installation required
Recommended material: Q235 galvanized round bar
Reasons: Moderate strength (yield 235MPa), good weldability, galvanized layer is resistant to atmospheric corrosion, and low cost.
5.How to choose galvanized rod material for bridge and heavy machinery applications?
Scenario: bridge cables, crane booms • Requirements: high dynamic load, impact resistance, long-term outdoor exposure
Recommended material: Q345B galvanized round bar (low alloy high strength steel)
Reason: Yield strength ≥ 345MPa (40% higher than Q235), good fatigue resistance, galvanized layer + substrate resistance to atmospheric corrosion is better than Q235.