Testing

Like identity card of each person, chemical composition is the only feature that identifies the specification of material. Lots of steel alloys could be forged, such as 1035 steel, 1045 steel,1020steel, 20CrMnTi, 20Cr, 40Cr, Q235, Q345, 20CrMo, 30CrMo, 35CrMo, 42CrMo, ect. For steel forgings, spectrum analysis is the most widely used method to do material inspection.

Hardness is the measurement of the resistance of a metal to plastic deformation. The process for checking the hardness of a material may vary but it usually consists of the use of an indentation that is measured in a forging. Hardness is the property that shows a materials ability to resist permanent deformation when it is under load. The greater the hardness of a material the greater the material will resist deformation. At JM Hardware®, we are able to perform below types of hardness testing: Brinell and Rockwell Hardness Testing.

Tensile testing, also known as tension testing, is a fundamental materials science and engineering test in which a sample is subjected to a controlled tension until failure. Properties that are directly measured via a tensile test are ultimate tensile strength, breaking strength, maximum elongation and reduction in area. From these measurements the following properties can also be determined: Young's modulus, Poisson's ratio, yield strength, and strain-hardening characteristics.Uniaxial tensile testing is the most commonly used for obtaining the mechanical characteristics of isotropic materials. Some materials use biaxial tensile testing. The main difference between these testing machines being how load is applied on the materials.

In materials science, the Charpy impact test, also known as the Charpy V-notch test, is a standardized high strain rate test which determines the amount of energy absorbed by a material during fracture. Absorbed energy is a measure of the material's notch toughness. It is widely used in industry, since it is easy to prepare and conduct and results can be obtained quickly and cheaply. A disadvantage is that some results are only comparative

Nondestructive Testing (NDT) is one of the main procedure of quality control in steel forging, and plays an important role in assuring that steel forgings will perform their usage in a safe, reliable, and cost-effective manner. NDT technicians perform the necessary tests to locate the indicators and discontinuities that may cause failures or shut downs in such systems. These tests are performed in a manner that does not affect the future usefulness of forgings– hence, the name “nondestructive.” NDT allows for careful and thorough materials evaluation without the need for deconstruction or damage. NDT is typically used at various points in a part’s life cycle. NDT can be used prior to the use of a component for the sake of quality control. NDT is also employed while components are in use to detect service related conditions caused by wear, fatigue, corrosion, stress, or other factors which affect reliability.