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inspection methods of forgings


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inspection methods of forgings


The main inspection methods of forgings

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The main inspection methods of forgings are as below:

Chemical composition analysis

Mechanical property test

Low magnification test

Metallographic high magnification inspection and NDT.

Chemical composition analysis

The general chemical composition analysis is mainly the content of carbon, manganese, silicon, sulfur and alloy elements. Forgings shall be sampled from the equivalent riser end. Important parts shall be sampled from the water and riser end in order to understand the segregation degree. For special parts or defects, it is often necessary to analyze the content of gas, inclusions and trace impurities for quality confirmation or research.

Mechanical property test

The mechanical property tests commonly used by forging factories are hardness, drawing, impact and bending tests. From the performance data, we can find the problems of the material, such as bubbles, porosity, cracks, grain size and temper brittleness in the steel can often be reflected on the fracture of the mechanical property sample.

Low magnification test

Sulfur printing, pickling and fracture are common low magnification inspection items. Sulfur print can show the distribution of sulfur on the cross section; Pickling can show various macro defects such as component segregation, porosity, shrinkage cavity, subcutaneous bubble, inclusion, peeling, white spot crack, etc. on the section; Fracture inspection is a simple and applicable method to find defects that can not be revealed by sulfur printing and pickling.

Metallographic high magnification test

This method is widely used for microscopic inspection and also for studying the microscopic characteristics of macroscopic defects. The optical microscope is used to observe the prepared metallographic sample under the magnification of 50 to 2000 times to check the inclusions, metal microstructure and grain size.


Commonly used methods include magnetic powder, fluorescence, coloring, ray, eddy current and ultrasonic wave. The correct selection of flaw detection methods to comprehensively and carefully inspect the surface and internal defects of forgings can accurately judge the size, quantity and distribution of defects. In the quality inspection of forgings, nondestructive testing has become one of the most important methods.

We are a professional manufacturer and supplier of high performance Forging Parts in China with 20 years' forging technology experience and offers an extensive range forging parts in 40Cr, 42CrMo and C70S6 steel material. At Yida, we specialize in high-volume production steel forgings with material 40Cr, 42CrMo and C70S6 etc, including:


Truck & Bus




General Aviation



Train/locomotive parts

Road trailer parts

Conveyor parts

Hand tools

Crane parts

Steering arms and other parts

Engine piston and connecting rod

Pneumatic and hydraulic fittings and parts

Valve and pump parts

Exercise equipment parts

Steel forging is an extremely versatile process which can be used to produce a broad spectrum of parts for all types of industries. If you’re unsure whether steel forging can produce the part you need, please contact us and our experienced staff are ready to provide you a professional proposal.

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