1. See if there are broken lines on the surface. An excellent cast iron guardrail, the surface is regular texture, and if the cast iron guardrail table show off to form a variety of irregular broken lines, then it shows that in the production process, in order to pursue the quantity, the businessmen press down too much, the next rolling will produce folding, so that the strength of the product steel will drop greatly.
3d捕鱼2. See if the surface is smooth. The surface of a good cast iron guardrail is very smooth, while the surface of a poor cast iron guardrail is very rough, and some of it will be uneven. The main reason is that the material of the iron itself is not uniform, there are many impurities, and the equipment and production process of the manufacturer of cast iron guardrail are not in place. In the production process, it is easy to stick steel and leave scars.
3. Check the surface for cracks. Poor quality cast iron guardrail, cracks can be seen from the surface, this is mainly because its raw material is soil billet, this kind of material is easy to crack in production.
4. Look at the surface metallic luster. Excellent cast iron guardrail surface is a very strong sense of metal, bright color. However, the surface of low-quality Tieyi lang'an is usually light red or pig iron, which is mainly due to the steel temperature not reaching the standard in the production process.
5。 Look at the section。 The strength of a cast iron guardrail manufacturer can be reflected。 A manufacturer of cast iron guardrail pays attention to the production process, its cross section is very flat, there will be no uneven phenomenon。