| Steel Grade | Chemical Composition % | |||||||
| C | Si | Mn | Cr | Ni | Mo | S | P | |
| ZG25CrNiMo | 0.25-0.30 | 0.20-0.40 | 0.70-0.90 | 0.40-0.70 | 0.40-0.70 | 0.15-0.25 | ≦0.025 | ≦0.025 |
| ZG30CrMo | 0.26-0.33 | 0.17-0.37 | 0.40-0.70 | 0.80-1.10 | — | 0.15-0.25 | ≦0.025 | ≦0.025 |
| ZG35CrMo | 0.32-0.40 | 0.17-0.37 | 0.40-0.70 | 0.80-1.10 | — | 0.15-0.25 | ≦0.025 | ≦0.025 |
| Standard | Yield Strength Rp0.2 /MPa | Tensile Strength Rb / MPa | Elogation A / % | Reduction of Area Z/ ％ |
| 60K | ≥414 | ≥586 | ≥18 | ≥35 |
| 75K | ≥517 | ≥655 | ≥18 | ≥35 |
| 80K | 585-660 | ≥725 | ≥18 | ≥35 |
Now we follow 75K standard
| No. | Equipment Name | Quantity(Set) |
| 1 | Transformer substation | 1 |
| 2 | Full set of wooden molding equipment | 10 |
| 3 | Sodium silicate sand mix line | 4 |
| 4 | Alkaline phenol resin sand mix line | 2 |
| 5 | 25 tons Electric arc furnace | 1 |
| 6 | 50 tons Intermediate frequency furnace | 2 |
| 7 | 120 tons Refining furnace | 1 |
| 8 | 120 tons VD furnace | 2 |
| 9 | 12m*9m*6m Heat treatment furnace | 3 |
| 10 | 120 tons Large-scale shot blasting machine | 1 |
| 11 | 150 tons Travelling crane | 2 |
| 12 | 125 tons Travelling crane | 3 |
| 13 | 200 tons Travelling crane | 2 |
| 14 | CNC gantry boring and milling machine | 2 |
| 15 | 2.5m-10m Digital vertical lathe | 16 |
| 16 | Boring and milling machine | 13 |
| 17 | Horizontal lathe | 3 |
| 18 | Large dust removal equipment | 7 |
1)The engineer will firstly prepare the technology and do a simulation before pouring.
2)We will make a pattern of the four way 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.
We will mainly use the silica sand，for the important R we use chrome ore sand.
We only can meet casting toleranct CT13.
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 mainly supply the castings for Shanghai Shenkai Group and also for some manufacturers in Yanchen city.
Petrolem machinery parts occupy our 12-15% prodcution.
We also apply a API certificate.
We make a ZG25CrNiMo to apply for it with CSL 3 2500-9999 lbs.
We get approval for API in 2021.
For castings for BOP,
the weight is always from 300KG to 30000KG.
We have upgraded our melting furnace to min. 40000KG,
we now only produce big castings from 2 tons to 40 tons for BOP.
| No. | Equipment Name | Quantity(Set) |
| 1 | Sand analysis equipment | 1 |
| 2 | Impact sample low temperature meter | 1 |
| 3 | Direct reading spectrometer(OXFORD) | 2 |
| 4 | ONH analyzer | 1 |
| 5 | ZEISS metallurgical microscope | 1 |
| 6 | Pendulum impact tester | 1 |
| 7 | Microcomputer controlled electro-hydraulic servo universal test machine | 5 |
| 8 | Various hardness tester | 4 |
| 9 | Magnetic defect detector | 5 |
| 10 | Ultrasonic flaw detector(digital) | 1 |
| 11 | CX-52 Total station | 1 |
| 12 | Stylus roughness meter | 1 |
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.