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English 
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Material
| 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 |
The material is common low carbon steel.
We have 8 class certificate including DNV,LR,ABS and so on.
We had supplied marine castings for 15500TEU,20000TEU and 23000TEU container vessel.
Prodution process
| 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 after 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.
Visual inspection(VT)
Based on his own eyes,an experienced inspector can identify the outside and inside surface defects,molding errors and improper filling of the large steel castings.
The sand holes,exceeding rough surface in blank,surface shrinkage,misruns and blowholes can be detected through visual inspection.
There would be three times dimension tests.The dimension test after casting in blank,in rough and finished 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
About Haitai
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.
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.
In 2011,we supply two sets of castings for PT PAD Indonesia,such as boss casting,rudder carrier and rudder horn.
In 2015,we gradully supply more and more marine castings for domestic market.
In 2018 to 2020,we supply marine castings for 3. Maj shipyard and Brodosplit shipyard.
There are five main steps of inspection and testings to guarantee the quality of large steel castings:dimension accuracy, chemical composition,mechanical property,ultrasonic test and magnetic powder inspection.
Production Process | Method | Remark |
Pattern Making | Dimension Inspection for the pattern | Done by engineer |
Melting | Chemical composition before and after pouring | |
Casting in blank | VT | |
Heat treatment | Test sample with castings | Mechanical Property |
Before first rough machining | Check the dimension and drawing the line | |
After rough machining | UT and MT | |
Semi-finished machining | UT and MT | |
Finished machining | UT and MT |
Testing Equipment
| 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.
Delivery
Our company is near to Shanghai port and we can supply different packing according to customers' specification.
