Method for matching oxide skin state and shot blasting performance of Q355 grade engineering machinery steel

By quantitatively evaluating the oxide scale of Q355 grade engineering machinery steel and matching the shot size, the problem of mismatch between oxide scale state and shot blasting performance was solved, improving shot blasting effect and coating reliability, and optimizing production process and economic benefits.

CN122409640APending Publication Date: 2026-07-17NANJING IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING IRON & STEEL CO LTD
Filing Date
2026-05-09
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies cannot quantitatively match the oxide scale state and shot blasting performance of Q355 grade engineering machinery steel, resulting in unstable shot blasting effect, affecting coating adhesion and protective performance, and lacking effective means to control oxide scale characteristics from the source of rolling process.

Method used

By sampling and measuring the area, adhesion, and thickness of the oxide scale, and combining this with metallographic analysis, the shot blasting difficulty value K of the oxide scale is calculated. Based on the difficulty of shot blasting, appropriate shot size and process parameters are selected to optimize the shot blasting process.

Benefits of technology

This method enables quantitative evaluation of oxide scale and matching of shot size, improves shot blasting effect, reduces subsequent processing steps, saves processing time and cost, and enhances coating reliability.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a method for matching the oxide skin state and the shot blasting performance of Q355 grade engineering machinery steel, which comprises the following steps: S1, taking two samples with the same size, measuring the residual area S1 of the oxide skin of the A sample by using a 3D profile measuring instrument, measuring the total measurement area S0, and testing the adhesion F of the B sample by using an adhesion pull tester; S2, cutting a metallographic analysis sample from the A sample, polishing and polishing the cross section, and then corroding the cross section by using 4% nitric acid-alcohol metallographic liquid, observing the cross section morphology by using a metallographic microscope, and measuring the total thickness T of Fe3O4 and FeO; S3, comprehensively analyzing the shot blasting performance of the oxide skin according to the residual area S1 of the oxide skin, the adhesion F and the thickness T of the oxide skin, and selecting a proper shot blasting process according to the analysis result. The method has the advantages that the shot blasting performance of the oxide skin can be quantitatively evaluated, the evaluation result is matched with the shot blasting pellet size, and the shot blasting effect of the oxide skin is greatly improved.
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