DUWON STEEL

QUALITY

DUWON STEEL

Specification

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Inspection & Test

Material Test
NDE

Hardness Test

Test methods are used to measure the degree of rigidity of metallic materials.
The typical method is as followings :

Brinell Mandness (HBS, HBN)
Shove Hardness (HS)
Rockwell Hardness (HR)
Vickers Hardness (HV)

Tension Test

Tension test is taken after being fixed on a tensile tester, which is cut down from the material to the test. This test measures a variety of points of the material, such as the Strength – Tensile strength and kidney – drawing, and mechanical properties of tensile specimen after loading slowly.

Impact test

There are various tester to obtain shock points when breaking materials such as tension , compression, bending test, the test shock applied to the specimen using metal tester.
Representative tester is for the degradation of impact bending test.

Penetrate Testing (PT)

01Apply Penetrant
02Clean then apply Developer
03Result

Detection of surface breaking defects only.
This test method uses the forces of capillary action
Applicable on any material type, as long they are non porous.
Penetrates are available in many different types:
Water washable contrast
Solvent removable contrast
Water washable fluorescent
Solvent removable fluorescent
Post-emulsifiable fluorescent

Magnetic Particle testing (MT)

01Apply contrast paint
02Apply magnet & ink
03Result

Surface and slight sub-surface detection
Relies on magnetization of component being tested
Only Ferro-magnetic materials can be tested
A magnetic field is introduced into a specimen being tested
Methods of applying a magnetic field, yoke, permanent magnet, prods and flexible cables.
Fine particles of iron powder are applied to the test area
Any defect which interrupts the magnetic field, will create a leakage field, which attracts the particles
Any defect will show up as either a dark indication or in the case of fluorescent particles under UV-A light a green/yellow indication

Ultrasonic Testing (UT)

01Apply Couplant
02Apply sound wave
03Result

Surface and sub-surface detection
This detection method uses high frequency sound waves, typically above 2MHz to pass through a material
A probe is used which contains a piezo electric crystal to transmit and receive ultrasonic pulses and display the signals on a cathode ray tube or digital display
The actual display relates to the time taken for the ultrasonic pulses to travel the distance to the interface and back
An interface could be the back of a plate material or a defect
For ultrasound to enter a material a couplant must be introduced between the probe and specimen

Radiographic Testing (RT)

01Load film cassette
02Exposure to radiation
03Developed graph

X or Gamma radiation is imposed upon a test object
Radiation is transmitted to varying degrees dependant upon the density of the material through which it is travelling
Thinner areas and materials of a less density show as darker areas on the radiograph
Thicker areas and materials of a greater density show as lighter areas on a radiograph
Applicable to metals,non-metals and composites

ECT(Eddy Testing)

ECT is a rapid and accurate technique used to detect discontinuities in tubing, condensers, plates, etc.
ECT is also performed for alloy separation and for the determination of treatment conditions.
The location of repair welds and seam welds may also be detected on ground machined surfaces.