Annealed Precision Ferritic Smooth Surface Finish Ductile Manhole Covers & Frames Sand Grey Cast Iron Components

Changzhou Renying and Changzhou Zhude are both subsidiaries of Shanghai Zhuzheng. Changzhou Renying specialises in trade and sales, while Changzhou Zhude focuses on production and processing.

We will submit the quotation in 24 hours if getting detailed information during working days. In order to quote for you earlier, please provide us the following information together with your inquiry. 1) 3D Step of Files and 2D Drawings 2) Material requirement 3) Surface treatment 4) Quantity (per order/per month/annual) 5) Any special demands or requirements, such as packing, labels, delivery, etc.

1) Each furnace of molten iron produced undergoes dual inspection and recording via both a spectrometer and an on-site carbon-silicon analyser. 2) Mechanical property testing is conducted on casting samples taken from every furnace alongside the production batch. 3) Workpieces undergo full visual inspection, with non-destructive testing performed either as sampling or comprehensive checks according to customer requirements.

If receive defective product, please send us the photos, we will feedback to our engineers and QC departments and solve the problems AS

1) For moulds, we will be coated one-layer anti-rust oil first, and then also will be covered thin films on the mould, finally pack into fumigation wooden case. 2) And as to products, we will pack into standard export cartons or as per customer's request to pack.