|less 0.23||less0.60||less1.60||less 0.04||Total less 0.80|
Reduction of Area
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.
|No. ||Equipment Name ||Quantity(Set)|
|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|
|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.
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.
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.
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.
Dimension Inspection for the pattern
Done by engineer
Chemical composition before and after pouring
Casting in blank
Test sample with castings
Before first rough machining
Check the dimension and drawing the line
After rough machining
UT and MT
UT and MT
UT and MT
|No. ||Equipment Name||Quantity(Set)|
|1||Sand analysis equipment||1|
|2||Impact sample low temperature meter||1|
|3||Direct reading spectrometer(OXFORD)||2|
|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.