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Cast ZG25CrNiMo Retaining Ring for BOP

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
Availability:
Quantity:

Material

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
ZG30CrMo0.26-0.330.17-0.370.40-0.700.80-1.100.15-0.25≦0.025≦0.025
ZG35CrMo0.32-0.400.17-0.370.40-0.700.80-1.100.15-0.25≦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

Normally we will follow 75K standard.


Production Process

Method

Remark

Pattern Making

Dimension Inspection for the pattern

Done by engineer

Melting

Chemical composition before and after pouring


Casting in blank

VT


Heat treatment

Test sample with castings

Mechanical Property

Before first rough machining

Check the dimension and drawing the line


After rough machining

UT and MT


Semi-finished machining

UT and MT


Finished machining

UT and MT



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.

1642741044(1)


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.

P11-1

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

3

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;

Chemical composition

The chemical composition has a significant influence on the mechanical property and can be further affected through change of the minor alloying elements.

The scrap will be tested and stored according to the chemical composition.

There will be a record before and after pouring.

There are two direct-reading spectrometers(FOUNDRY-MASER PRO,OXFORD INSTRUMENTS) which are imported from German.

The testing equipment will be calibrated annually.

Mechanical property

Mechanical test result shows an evaluation of the metal according to customers’ requirement.

Ultrasonic test

Ultrasonic test gives an guarantee of the inside quality of the large steel castings.

A qualified UT tester will do the test with normal probe according to customers’ UT level.

The sound can detect the internal defects of the large carbon steel and alloy steel castings.

Sound waves will change according to the internal structure.During UT process,the high frequency acoustic energy is transmitted into the casting.

It travels via the casting until it hits the opposite surface,interface or defects.The interface or defects reflect portions of the energy which are collected and displayed on the test machine(the depth,width and thickness).


5)Clean the sand and cut the riser before heat treatment

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.

热处理炉

Magnetic powder inspection

It is not easy to find the tiny cracks,pores and other surface glitches on the large carbon or alloy steel castings by human eyes.In this situation,a colored dye solution is applied to the surface of the casting.

In general, dye-penetrant techniques identify defects on the surface of the casting and do not detect internal porosity or shrinkage that is not open to the surface. But it can detect rounded indications for porosity or gas on the casting surface.

Magnetic powder inspection is a quick,economic and sensitive way to find the surface defects on the large carbon or alloy steel castings.


7)dimension check and draw a line for machining.

IMG_2136

8)Rough machining

IMG_20180712_074019

9)NDT withe qualified inspector

磁粉照

10)Welding repair if needed and tempering for stress relief

11)Final machining and NDT

12)Customers' inspection and packing

8-1




About Haitai

P5

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.


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.

3233


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