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30 Tons Cast ZG25CrNiMo BOP Shell

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

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 R_p0.2 /MPa	Tensile Strength R_b / 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	12m9m6m 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.

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2)We will make a pattern of the bop shell based on engineer's technology.

It will cost us around one week.

After that the engineer will check the dimension and make a record.

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3)Sand molding making will be made by experienced wokrers.

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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 castings for petroleum machinery is always at high quality requirement.

The NDT requirement is always level 2 instead of level 3.

5)Clean the sand and cut the riser after normalizing.

We use hot cutting riser method.

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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.

The castings for BOP is always within 30 tons.

We use the electrical arc furnace to get well melting steel.

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7)dimension check and draw a line for machining.

8)Rough machining

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9)NDT withe qualified inspector

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10)Welding repair if needed and tempering for stress relief

11)Final machining and NDT

12)Customers' inspection and packing

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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 also supply the petroleum machinery casting parts for several famous domestic companies,such as Shanghai Shenkai Group.

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