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Steel Casting Spare Parts For BOP Equipment

Material:ZG25CrNiMo

Application: BOP,petroleum machinery

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

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Material

Material:ZG25CrNiMo

Steel Grade	Chemical Composition %
Steel Grade	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

Most of the material is ZG25CrNiMo.

After quenching,we can get good value for mechanical property.

The product needs to work at low temperatures,

so the corresponding impact requirements will also be higher.

ZG25CrNiMo is a type of cast steel that belongs to the group of low-alloy steels.

It is commonly used in the manufacturing of various industrial components, particularly in applications where high strength, toughness, and wear resistance are required.

The specific use of ZG25CrNiMo can vary depending on the industry and the requirements of the application.

Oil and Gas Industry: ZG25CrNiMo can be found in equipment used in the oil and gas industry, including drilling rigs, pumps, valves, and other components subjected to high stress, corrosion, and wear.

Its resistance to fatigue and good mechanical properties make it suitable for demanding applications in this sector.

Prodution process

1）Pattern making

We make the wooden pattern according to engineer's design.

We have our ERP system to show when starts and ends the making of the pattern.

When we are busy or for some urgent order,

we will also ask our sub-contractor to help us.

We will only keep the wooden pattern one year.

2)Sand mold making

The castings for the BOP is alway small for us.

We will make the sand mold one day and do the pouring next morning.

The main body is made by silica sand outside with recycled sand inside.

3)Pouring

After we do the pouring,

we will wait for 3 days for cooling.

4)Rough machining and quenching

We will do the rough machining quickly.

After that,we will do UT and MT to check whether there is inside defects or crack.

We will do welding repair according to WPS.

After tempring,we will send them to our sub-contractor for quenching.

5)Post procedure

The rough machining can be very quick,

while we will spend a lot of time for post procedure,such as grinding.

Nomrally we need at least two months from casting to rough machining for delivery.

Most of the castings for BOP is pre-machined.

About Haitai

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

In 2007,we moved our factory to Sunzhuang town and now we can supply bigger steel castings with max. weight 45 tons.
And now we can make much bigger castings from 3 to 190 tons.

The material is low carbon or alloy steel.

Now we have two sand mold making workshops,two post procedure workshops,one pattern making workshop and one machining workshop.

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