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English 
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Material
| 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 |
Normally we will follow 75K standard.
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 kiln tyre 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.
Most of them have more than 10 years' experience.
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;
The max. melting weight can be around 200 tons,
the unti weight we can make is 150 tons after finished machining.
5)Clean the sand and cut the riser after normalizing by hot cutting method.
6)Heat treatment will cost 7 days( 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.
VT inspection after we take the casting out from the sand,
the inspection team will also check the machining allowance.
8)Rough machining
After rough machining,the surface will be ok for NDT.
We can firstly check the quality and continue the next procedure.
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 rich experience to supply castings for BOP of Russian market.
We make around 1500 tons petroleum machinery castings per month.
We mainly supply them for Shanghai Shenkai Group and some factories in Yancheng city.
We also supply them for some Russian customers.
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.
