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OEM Fabrication Quenched Four Way Castings for BOP

Material:ZG25CrNiMo
Application: BOP,petroleum machinery,oil well
Weight: 500kg to 30 tons
Status:pre-machined
Class certificate:ABS,CCS,NK,LR,DNV,RINA,BV,KR
Payment terms:T/T or L/C
Availability:
Quantity:

Material

Material:ZG25CrNiMo

Steel GradeChemical Composition %
CSiMnCrNiMoSP
ZG25CrNiMo0.25-0.300.20-0.400.70-0.900.40-0.700.40-0.700.15-0.25<=0.025<=0.025
ZG30CrMo0.26-0.330.17-0.370.40-0.700.80-1.10-0.15-0.25<=0.025<=0.025
ZG35CrMo0.32-0.400.17-0.370.40-0.700.80-1.10-0.15-0.25<=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
80K585-660≥725≥18≥35


It is up to customers' requirement.

ItemStandard
Casting MaterialEN 10293/EN 10025/BS 3100/DIN 1681/DIN17205
Casting Tolerance in BlankISO 8062 CT 13
Size ToleranceDIN ISO 2768m
NDTASTM A609 Level 2 or 3 /EN 12680/ASTM E94 Level 2 or 3
Heat TreatmentNormalizing+Tempering+Quenching
HardnessAs Required


Most of castings for petroleum was made in rough machining.

We also have API certificate.


Prodution process

The material for BOP castings is ZG25CrNiMo.

To get more value for impact,we will always to quenching for it.


1)pattern making.

We have our own pattern workshop.

It can help us to control the pattern making process or save production cost.

Our engineer will check the pattern dimension and make a record.

Normally we will only help our customers to save the wooden pattern one year.

Most of the time we make wooden pattern.

56


2)Sand mold making

We have around 5-7 teams to make the sand mold.

Around 15% of our annual output is for petroleum machinery.

Some team is fixed for the petroleum machinery.

For the important corner,we use chorme ore sand,

while for other position,we use recycled silica sand.


On the inner surface of the sand mold,

we will make a painting and burn it for smooth.

4 (4)


3)Melting and pouring

We will do the melting in night for cheaper electricity charge.

And we will do the pouring in the early morning.

We will take the test sample before and after pouring for chemical composition.


4)Cooling

After pouring,the castings will be waiting for cooling.

The cooling time is up to the weight of the castings.

It will be 3 to 7 days or more time.


5)Heat treatment

Most time we will cut the riser before we do heat treatment.

We have around 10 furnaces for heat treatment.

Heat treatment of normalizing and tempering will cost 7 days.

滑轮热处理


6)Rough machining

The test block will be together with the castings for heat treatment.

Firstly if the chemical composition can meet the requirement,

we will do the mechancial property test.

Our labratory has gotten approval from CNAS.

CNAS

After VT,we will check the machining allowance and draw the white line on the body of castings.

There will be 5-7mm margin left after rough machining.


After UT and MT,we will do the welding repair.

For the welding repair,we will have WPS for ZG25CrNiMo.

When the welding repair is finished,we will do the tempring for stress relife.


7)Quenching

For the quenching,we will send them to our sub-contractor.


Most of our petroleum machinery castings are for Shanghai Shenkai Group or manufacturer for BOP in Yanchen City.








About Haitai

P5

Haian Haitai Casting Co.,Ltd. is established in 2003 in Huangqiao Town.

With a quick development,we are now can producing 3 to 190 tons piece.

The bigger the better for us.

Most of our castings are for cement mill.


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.


P6-3

P10-1

P10-3

Delivery

Our company is near to Shanghai port and we can supply different packing according to customers' specification.

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