| Chemical composition | ||||||||
| C | Si | Mn | S | P | Residual Element | |||
| Ni | Cr | Cu | Mo | |||||
| less 0.23 | less0.60 | less1.60 | less 0.04 | Total less 0.80 | ||||
Tensile Strength σb | Yield Stress σs | Elongation δ | Specimen |
Reduction of Area Ψ | |||
N/mm2 | % | % | |
≥415 | ≥205 | ≥24 | ≥35 |
| 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.
Before production,there should be an approval drawing and letter from customer for related class.
2)We will make a pattern of the fore boss casting 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 workshops for sand mold making,one workshop for machining and one for post procedure.
We have 9 class certificate:ABS,RINA,DNV,LR,KR,BV,CCS,NK and have cooperation with most of Chinese famous shipyards and some foreign shipyards.
Now we supply around 1000 tons marine castings for severals shipyards in Shanghai or Jinjiang.
In recent years,because of the huge demand of container vessel,we supply a lot of stern boss castings.
| 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.