STK400/500 hot-dip galvanized steel pipe is a hot-dip galvanized carbon structural steel pipe. Its material is STK400 or STK500. These two materials correspond to China's Q345B and Q355B steel respectively. This kind of steel pipe has excellent mechanical properties and anti-corrosion properties, so it is widely used in various industrial fields.
STK500 galvanized steel pipe outer diameters typically range from smaller sizes, such as DN15 (approximately 21.3 mm), to larger sizes, such as DN1200 (approximately 1220 mm) or larger. These sizes are based on the needs of the piping system to meet different fluid transfer requirements.
The wall thickness range of STK400 hot-dip galvanized steel pipe will vary according to the size of the outer diameter. Generally speaking, the wall thickness can be increased from a thinner 1.6 mm (for smaller outer diameters) to a thicker several millimeters (for larger outer diameters).
| Specification | STK400 | STK500 |
|---|---|---|
| Material Grade | STK400 | STK500 |
| Chemical Composition (%) | C: ≤0.20, Si: ≤0.55, Mn: ≤1.60, P: ≤0.045, S: ≤0.045 | C: ≤0.20, Si: ≤0.55, Mn: ≤1.70, P: ≤0.045, S: ≤0.045 |
| Tensile Strength (MPa) | ≥400 | ≥500 |
| Yield Strength (MPa) | ≥235 | ≥345 |
| Elongation (%) | ≥22 | ≥21 |
| Impact Test Temperature (°C) | -20 | -20 |
| Zinc Coating Thickness (μm) | ≥65 | ≥65 |
| Pipe Schedules | SCH10, SCH40, SCH80, etc. | SCH10, SCH40, SCH80, etc. |
| Applications | Water supply, Gas transmission, Fire sprinkler systems, etc. | Water supply, Gas transmission, Fire sprinkler systems, etc. |
STK400 hot dip galvanized mild steel pipe
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