Identifying Quality Polyurethane Insulation Steel Pipes

Introduction

With the increasing use of polyurethane insulation steel pipes, many low-quality products have entered the market. To help you avoid purchasing substandard pipes, here are some tips on identifying quality polyurethane insulation steel pipes.

Surface Appearance

Poor-quality polyurethane insulation steel pipes often have a pockmarked surface. These bumps and irregularities are caused by worn rolling grooves during manufacturing. Shoddy manufacturers, focused on profit, often overuse their rolling equipment, resulting in these defects.

Cracks and Defects

Cracks on the surface are another sign of poor quality. These cracks occur because the billet used is porous and develops cracks due to thermal stress during cooling. When rolled, these cracks become visible on the pipe's surface.

Thickness and Fill

Substandard pipes often have thin and uneven crossbars, indicating insufficient material fill. This happens because manufacturers aiming for large negative tolerances press the iron too much in the initial stages, leading to a small mold that doesn't fill properly.

Composition and Cutting Quality

High-quality polyurethane insulation pipes have a uniform composition and smooth, neat ends when cut with high-tonnage cold shear. In contrast, substandard pipes have rough, uneven cut ends with no metallic luster. These pipes also show signs of insufficient cutting, with large, irregular edges.

Conclusion

By paying attention to these signs—surface appearance, presence of cracks, thickness and fill, and the quality of cuts—you can identify and avoid buying low-quality polyurethane insulation steel pipes.

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