| Material | C | Si | Mn | P | S | Cr | Mo |
| ZG42CrMo | 0.38-0.43 | 0.15-0.35 | 0.75-1.00 | ≤0.035 | ≤0.035 | 0.80-1.10 | 0.15-0.25 |
| Material Standard | GB, EN, DIN, ASTM, GOST, JIS, ISO |
| Weight | 500kg-70 tons |
| Heat treatment | Normalizing+tempering+surface hardening |
The material is GS42CrMo4,
it is a little more strict control of elment than ZG42CrMo.
We always do the quenching for the gear wheel.
The hardness should be 240-285HB average.
We had supplied thousands of wheel for marine winch.
We have cooperation with our Holland customer since 2011.
The wheels are from 500kg to 70000kg.
Gear cutting and teeth hardening is done by sub-contractor in nearby Changzhou City.
The structure for the gear wheel is simple and can be easily machined by vertical lathes.
We have 2m to 10m different kinds of vertical lathes.
The min. wall thickness should be not less than 50mm.
Too thin wall thickness will cause deviation when we do heat treatment.
Chinese Material | International Material |
25# | BS 060A35/AISI 1035 |
35# | GE300/C35/GS-45/BS 060A35/AISI 1035 |
45# | C45/GS-52/BS 080M40/AISI 1045 |
ZG35CrMo | GS-34 CrMo4V/BS 708A37/AISI 4137:4135 |
ZG42CrMo | GS-42/CrMo4V BS 708A37/AISI 4140/SCM440(H) |
ZG40CrNiMo | 34CrNiMo6/BS 817M40/AISI 4340 |
1）Pattern making
For the ZG42CrMo quenched wheels,
our customer always order many for same type.
If the quantity is more than 10pcs for same type,
the wooden pattern will be free.
Wheels for our Holland customer from small to big ones are our ordinary product,
we will save and maintain the pattern periodicity.
For other wooden pattern,we will save not more than one year.
2)Sand mold making
For the sand mold of wheels,when we make the wooden pattern,we will make a same one scale 1:1.
We will make 4pcs sand mold one day or more for convinience of pouring.
3）Cut riser and draw the line
After cooling,we will cut the riser with thermal method before 7 days heat treatment.
4)Rough machining
We will do NDT test after rough machining.
For our customer,HB requirement is the most important.
The HB should be between 240-285.
When they receive it,they will do gear cutting and teeth hardening by themself.
5)Gear cutting
We don't have gear cutting machine,
but we have sub-contractor to do gear cutting nearby.
For higher accuracy requirement,we can send the gear to Changzhou.
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.
We had cooperation with our Holland customer since 2011.
| 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.
When we got approval from CNAS,it can help us to get more foreign orders.
Our company is near to Shanghai port and we can supply different packing according to customers' specification.