Because ductile iron has a better weight / strength ratio, the manhole cover made of ductile iron can be lighter than the same product made of grey iron。 20%-30%。 Therefore, the transportation cost is reduced, and the manhole cover is more convenient to handle, and meanwhile, the nodular cast iron has excellent welding property, and the grey iron does not have welding conditions。
Ductile iron covers are currently used in various industries, the scope of the application, that is more and more widely, and then the small series on how to select high-quality ductile iron manhole cover,
1, secondly, to study the strength of nodular cast iron manhole cover manufacturers, not only look at a supplier's office has much publicity, more loudly, to the supplier to the real production covers the site to inspect and confirm the production capacity of manufacturers, operating period, to see if there is no commitment the customer service ability.
2. Compare prices. Pay attention to the basis of the price comparison, we must ensure that the weight of Fuzhou ductile iron covers fully meet the requirements, can not be reduced prices, and quality is also reduced, this is a risk hidden danger.
3, in the procurement of ductile iron manhole cover must determine if the calculation can not cover the load, and require the use of the proposed occasions, by the manufacturers to report specific programs, the key point is the carrying capacity of selected covers, if required to cover the real bearing capacity can not reach the road, the use is not safe on the road on
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