GB/T 43409-2023 in English

1. Background and significance of standard formulation

GB/T 43409-2023 "Metallographic Examination of Carbon Steel and Low Alloy Steel Castings for General Engineering and Structural Use" is an important standard formulated for the metallographic examination methods and technical requirements of carbon steel and low alloy steel castings. With the continuous improvement of modern industry's requirements for casting performance and quality, this standard provides a scientific basis for ensuring the reliability of castings in engineering and structural applications.

2. Main content framework of the standard

3. Interpretation of Standard Technical Requirements

3.1 Metallographic Structure Inspection of Cast State

Table 1 lists in detail the typical grades and metallographic structure characteristics of low carbon steel, medium carbon steel and high carbon steel castings. For example, under 100 times magnification, Widmanstätten structure and pearlite can be seen in ZG200-400.

4. Implementation suggestions

1. Testing equipment selection:It is recommended to use a metallographic microscope equipped with a high-precision objective lens (such as Leica MZ10F) to meet the needs of different magnifications.
2. Staff training:It is recommended to conduct systematic training for inspectors, focusing on mastering the rating methods and pattern recognition skills specified in the standard.
3. Quality control:Establish a regular calibration system to ensure the accuracy of instruments such as microscopes and sample preparation equipment.