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Portable Micro-Indentation Tester for mechanical properties and residual stress testing 

◆ Wuxi Zhanghua Pharmaceutical Equipment Co., Ltd./ Jiangsu Gurion High Technology Co. Ltd. is a team aiming to develop into a high-tech enterprise, focusing on the development and sales of portable non-destructive mechanical properties and residual stress testing devices.

◆ The team independently developed the mechanical properties and residual stress detector based on the indentation method/ pressing energy difference method, and designed a variety of supporting fixtures to make the product 

suitable for different working conditions on site.

◆ The team is currently positioned in the field mechanical properties and residual stress testing industry of energy equipment such as pressure vessels and pressure pipelines


◆ Mainly to domestic third-party testing institutions and first-line production units

◆ The technology won the Gold Medal of the Geneva International Exhibition of Inventions.

◆ To special pressure equipment, long-distance transmission pipelines and remanufacturing

major energy equipment as service objectives.

◆ It can provide first-hand test data for finite element simulation, failure analysis, life evaluation, safety assessment, etc.,

◆ Realize the test support of both safety and economy

◆ Committed to the research and development of mechanical properties and residual stress detector series, related testing technical services.


Features

◆ On site non-destructive

◆ Lightweight and portable

◆ Accuracy assurance

◆ Applicable to multiple scenarios


Advantages

◆ Strength online test 

◆ Stress nondestructive testing 

◆ Welding process evaluation 

◆ Heat treatment program customization 

◆ Equipment failure analysis 

◆ Equipment life assessment


Mechanical performance testing

1. Comparison with uniaxial tensile experiments

 


Test object: tensile specimen

Testing materials: multiple homogeneous materials

Test method: ball indentation method, uniaxial tension

Test equipment: PMT-1000



Yield Strength 60.2(MPa)

Tensile strength 6b(MPa)


Indentation

Stretch

Error

Indentation

Stretch

Error

Q345R

435

412

5%

595

547

8%

15CrMo

353

340

3.7%

471

499

-5.9%

45Number steel

353

333

5.7%

541

560

-3.5%

12MnNiVR

482

490

-1.6%

662

674

-1.8%


2. Comparison of steam pipelines before and after service


Test object: steam pipeline

Test material: 12Cr1MoV

Test method: ball indentation method, uniaxial tension

Test equipment: PMT-1000


Yield strength 6o.2(mpa)

Tensile strength 6b(mpa)


Ball press

Stretch

Error

Ball press

Stretch

Error

Raw steel

309.7

305.9

1%

510.0

480.7

6%

Service steel

249.3

230.7

8%

492.6

474.3

4%


3. Tank strength test



Test object: storage tank

Test material: Q235B

Test method: ball indentation method

Test equipment: PMT-1000

 

  

Yield Strength

tensile strength

1

262.95

477.86

2

260.80

476.21

average

261.88

477.04


4. Strength testing of steel pipes in service



Test object: Service steel pipe

Test material: 20 # steel

Test method: ball indentation method

Test equipment: PMT-1000



Yield Strength

tensile strength

1

293.31

533.49


5. Strength test of high-pressure waste heat exchanger



Test object: high-pressure waste heat exchanger

Test material: CrMoV steel

Test method: ball indentation method

Test equipment: PMT-1000


Test serial number

from center of weld
     (mm)

Yield Strength 
     (MPa)

Tensilestrength
     (MPa)

workhardening index 

(n)

1

70

438.787

585.323

0.194

2

35

454.357

608.69

0.158

3

0

520.633

678.637

0.174

4

35

454.079

607.626

0.160

5

70

431.036

571.466

0.165


Residual stress testing

1. Comparative experiment



Test object: high-pressure waste heat exchanger

Test material: CrMoV steel

Test method: ball indentation method

Test equipment: PMT-1000


Material

6x(Applied Value)

6x(Actual Value)

Absolute Error

6y(Applied Value)

6y(Actual Value)

Absolute Error

 

S45c

268

262

-6

239

257

18

144

177

33

249

284

35

77

87

10

287

267

-20

 

12cr1mov

192

210

18

15

18

3

45

22

-23

174

159

-15

96

78

-18

191

184

-7



2. Additive manufacturing specimens


Test object: Residual stress of additive manufacturing specimens

Test material: Inconel718

Testing methods: indentation energy difference method, X-ray diffraction method

Test equipment: PMT-1000


                 
                 
                 


3. Thick walled cylinder weld seam



Test object: Residual stress in welded specimens of thick walled cylinders

Test material: 15CrMoR

Testing methods: indentation energy difference method, indentation strain method

Test equipment: PMT-1000


4. Large heat exchanger tube plate circumferential weld



Test object: Residual stress in the circumferential weld seam of large heat exchanger tube sheets

Test material: Q345R

Test method: Pressure energy difference method

Test equipment: PMT-1000


Cylinder Side

Longitudinal Stress
     (Mpa)

Transverse Stress
     (Mpa)

1

165

-21

2

164

13

3

123

26


5. Circumferential weld seam of heat exchanger cylinder



Test object: Residual stress of the circumferential weld seam of the heat exchanger cylinder after heat treatment

Test material: Q345R

Test method: Pressure energy difference method

Test equipment: PMT-1000

Applicable to multiple scenarios



◆ Residual stress detection of longitudinal weld seam of cylinder section

◆ Residual stress detection of reactor cylinder closure weld seam

◆ Residual stress detection of the welding layer on the inner wall of the cylinder

◆ Residual stress detection of welds in heat exchangers before leaving the factory

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