Casting Steel Large Half Ring Gear for Cement Mill

If surface hardening is needed,we can do it by our sub-contrator.

But better not ask for surface hardening.

I only believe our own equipment and everything is under control.

Hardening by sub-contractor can be as smooth as in our own workshop.

ZG42CrMo or ZG35SiMn is common material for gear and kiln tyre.

1)The engineer will firstly prepare the technology and do a simulation before pouring.

2)We will make a pattern of the half gear based on engineer's technology.

It will cost us around one week.

After that the engineer will check the dimension and make a record.

3)Sand molding making will be made by experienced wokrers.

4)Pouring and cooling.

There are one 8tons electrical arc furnace;

Two 50 tons medium frequency furnace;

One 120 tons refining furnace and one 120 tons VD furnace;

5)Clean the sand and cut the riser before heat treatment

6)Heat treatment will cost 7days( 4 days normalizing and 3 days tempring).

There are 8 heat treatment furances with max. one is 12m*9m*6m.

7)dimension check and draw a line for machining.

8)Rough machining

9)NDT withe qualified inspector

10)Welding repair if needed and tempering for stress relief

11)Final machining and NDT

12)Customers' inspection and packing

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

We supply large steel castings with low carbon or alloy steel from 3 tons to 150 tons per piece.

With a quick development,now we had supplied steel castings 6,000 tons per month.

There are three workshop for sand mold making,one workshop for machining and one for post procedure.

Our main products are for cement mill(around 30%).

We supply around 400pcs kiln tyres,170 sets of ring gears and 930pcs supporting rollers a year.

We also have rich experience of the castings for shipbuilding with 9 class certificate.

Half gear is our fist product.

We make it a lot in one year.

Kiln tyre,supporting roller and half gear are the castings we make everyday.

We accumlated lots of experience for them and can fix any problem.

For our own technology,we can make it for woking area without any welding.

It is our speical,we get this kind of special by thousands of making.

That is also most of time it is forbidden to go through our sand mold making workshop carefully.

We have our own technology and not open to customers.

We grow up together with our customers.

Our customers will ask for higher technical requirement than before,

we should improve our skills to meet their requirement and challange the market

We supplied small half gear for Bolivia for ball mill.

The hlaf gear can be quicked finished with gear cutting around two and half months.

For bigger ones,we need more time to finish it.

The gear cutting is finished by nearby sub-contactors.

We do the test according to diffrent production step,

such as chemical composition,UT,MT and mechanical property.

In 2021,Haitai inspection and testing center got approval from CNAS.

Our company is near to Shanghai port and we can supply different packing according to customers' specification.