Large Low Carbon Steel Grinding Plate by Sand Casting

 Material:ZG270-500

Haian Haitai Casting Co.,Ltd. is established in 2003 in Huangqiao Town.

In 2007,we moved our factory to Sunzhuang town and now we can supply bigger steel castings with max. weight 45 tons.

In 2011,we built a new sand mold maiking workshop with 120 tons refinining furnace and the max. weight can be 120 tons.

In 2013,we paid more attenion on the castings for shipbuilding and started to supply marine castings for most of domestic famous shipyards.

From 2013 to 2022,we bought more and more machines to strengthen our ability from rough machining to finished machining.

In 2021,we built another new sand mold making workshop for the quick development of market requirement.

Now we monthly supply 6000 tons different castings for different customers of different industry,such as cement mill,shipubuilding,petroleum machinery,rolling mill,forging press and so on.

1.Quotation
When we receive the drawing and technical requirement from customer,
we will firslty check whether we can meet customers' requirement,
then we will input the data to our ERP sytem for calculationg the price.
For urgent enquiry,we can get the price with 24 hours,
normally it will be 48 hours.

2.Patern Making
We have our own wooden pattern making workshop.
But our company is always busy,
we also have around 10 sub-contractors for pattern making.
They help us for the pattern but will be inspected according to our rules.
We will record for every pattern inspection.

3.Sand Core Making

We have around 80 technicans for sand core making which is divided into around 10 teams.
Most of the technicans has more than 10 years' experience.

Most of the sand core is made by silica sand with common sand inside of it.
The common sand will be used repeatly.
For some important position,such as R corner,we will use chorme ore sand.

The outside of the sand core,we will do the painting,burn and clean it.

We will assemble diffrent sand cores together and wait for pouring.

4.Meltinig and Pouring
We always do the melting after mid-night for cheaper electric charge.
And we normally do pouring in the early morning.

5.Cooling
When we do pouring,we will also check the chemical compositon.


After pouring,we will wait for different time for cooling according to casting's weight.

6.Heat treatment

The maximum size of the heat treatment furnace is 12m*9m*6m.
The size also decide the max. size we can make for the casting.

We only can do normalizing and tempering.
The quenching if needed will be done by our sub-contactor.

Cutting the riser,we choose thermal cutting method.


After heat treatment,we will do the mechanical property test.

7.Draw the Line and First Rough Machining
 

8.Firstly NDT after Rough Machining



9.Welding Repair
We have rich experience for making support roller,
then there is no welding for the outside working position.
This is our special technology.

But for some other castings,if we do the welding repair,
we will do the tempering for stress relief later.

All of our welders have the SGS certficate.



10.Final Machining
We have a lot of vertical lathes from 2.5m to 10m.

We get approval from CNAS for our laboratory.
We also have 9 class certificate,such as ABS,DNV,NK,RINA,KR,CCS,BV and so on.

We do the packing by ourself with some iron support.



 

Normally the customers will come and inspect the goods before shipment.

Or the quality for castings after rough machining is ok,
but find some defects when the customers do the final machining,
we will check what the problem is according to customers' feedback.