Here are the important performance indicators for hot rolled heavy plate:
Yield Strength
When the metallic material exhibits a yielding phenomenon, a stress point at which plastic deformation occurs without increasing the force is reached during the test. The upper yield strength and the lower yield strength need to be distinguished. Its marking material changes from elastic deformation to plastic deformation. For materials with continuous yield characteristics, the yield strength is usually expressed as Rp0.2.
Summary of detection methods
The static axial tensile test method is used to calculate the test according to the load corresponding to the characteristic point divided by the original cross-sectional area of the sample at room temperature. The use of an extensometer for measuring the elongation of the sample is also required for the detection of Rp0.2 and Rt0.5.
Testing standard
GB/T 228.1, ISO 6892-1, ASTM A 370, ASTM E8/E8M, JIS Z 2241
Tensile Strength
The maximum engineering stress that the specimen can withstand before being fractured. Used to characterize the resistance of a material to maximum uniform plastic deformation.
Summary of Detection Methods
The static axial tensile test method is used to calculate the maximum force during the tensile test divided by the original cross-sectional area of the sample at room temperature.
Testing Standard
GB/T 228.1, ISO 6892-1, ASTM A 370, ASTM E8/E8M, JIS Z 2241
Elongation after Break
The post-break elongation is a plasticity index of the material and is the ability of the specimen to undergo plastic deformation from tension to fracture. Calculated using the residual elongation of the post gauge and the percentage of the original gauge length.
Summary of Detection Methods
The static axial tensile test method is used to stretch the sample to break at room temperature. The tester obtains the original gauge length and the post-break gauge length of the sample, and obtains it by calculation. It can also be measured by means of an extensometer and calculated.
Testing Standard
GB/T 228.1, ISO 6892-1, ASTM A 370, ASTM E8/E8M, JIS Z 2241
Bending Result
A test method for determining the ability of a metal material to withstand bending plastic deformation.
Summary of Detection Methods
The bending test was subjected to bending plastic deformation on a bending tester in a circular, square or polygonal specimen until the specified bending angle was reached and then the crack in the curved region of the specimen was evaluated.
Testing Standard
GB/T232, JIS Z 2248
Shock Absorption Energy
The energy absorbed by the specimen of the specified shape and size when it is broken by the impact test force. It is used to express the ability of the material to withstand impact loads and to evaluate the toughness of the material. According to the notch of the sample and the pendulum blade of the impact machine, it is divided into KV2, KV8, KU2 and KU8.
Summary of Detection Methods
After the notched impact sample of the specified geometry is placed at a predetermined temperature for a predetermined period of time, it is quickly placed between the two supports of the impact tester, and the impact sample is struck with a pendulum to measure the absorption energy of the sample.
Testing Standard
GB/T 229, ISO 148-1, ASTM E23, ASTM A370, JIS Z 2242
Shear Section Ratio (Fiber Ratio)
The proportion of the ductile section on the impact fracture. The higher the shear profile, the better the toughness of the material.
Summary of detection methods
100% minus the percentage of the brittle section area on the fracture of the impact test and the original cross-sectional area below the notch.
Testing Standard
GB/T 229, ISO 148-1, ASTM E23, ASTM A370, JIS Z 2242
Brinell Hardness
The ability of the metal material to resist external force deformation adopts the load on the concave area of the unit indentation as the hardness value.
Summary of Detection Methods
The Brinell hardness tester is used to press the cemented carbide ball into the surface of the sample under a certain load, and the load is removed after the specified holding time. The Brinell hardness is calculated by measuring the surface indentation diameter and converting it into an indentation depression area.
Testing Standard
GB/T 231.1
Rockwell Hardness
The ability of metal materials to resist external force deformation, using the depth of the indentation to indicate the hardness value.
Summary of Detection Methods
Using a Rockwell hardness tester, the indenter is pressed into the surface of the sample in two steps using a specified load. After the specified holding time, the main test force is removed, and the depth of the residual indentation is measured to obtain Rockwell hardness.
Testing Standard
GB/T230.1、ASTM E 18
