Plasma arc cutting method for high-manganese austenitic steel

By integrating preheating-cutting-controlled cooling and precise linear energy control, the problems of cracking and microstructure deterioration in the cutting of high-manganese austenitic steel have been solved, achieving high-quality cut surfaces and low-cost production.

CN122142482APending Publication Date: 2026-06-05NANJING IRON & STEEL CO LTD +1
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Patent Information

Application Number
CN202610354699.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-23
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

The cutting of existing high-manganese austenitic steel has problems such as easy cracking, deterioration of the microstructure in the heat-affected zone, and poor cutting surface quality. In particular, the lack of full-process thermal circulation control in plasma arc cutting makes it difficult to meet the stringent requirements of high-end equipment.

Method used

The integrated process of preheating-cutting-controlled cooling is adopted. Preheating reduces thermal stress, synchronous cooling inhibits grain growth, and slow cooling after welding eliminates hardened structures. Combined with precise line energy control, high-quality cutting of high-manganese austenitic steel is achieved.

Benefits of technology

It effectively suppresses micro-cracks on the cutting surface, significantly improves the quality of the cutting surface, and is suitable for processing various high-manganese austenitic steel plates, reducing production costs and improving production efficiency.

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Abstract

The invention discloses a plasma arc cutting method for high-manganese austenitic steel. The plasma arc cutting method comprises the steps that S1, a steel plate is preheated to 150-250 DEG C; s2, plasma arc with specific parameters is adopted for cutting, the cutting current I and the plate thickness d meet the condition that I = kd, and the cutting speed v and the plate thickness d meet the condition that v = (12000 / d) * alpha; s3, in the cutting process, mixed cooling gas of compressed air and carbon dioxide is synchronously sprayed to the cutting area for rapid cooling; and S4, after cutting, the workpiece is immediately buried in a heat preservation medium for slow cooling. The method has the advantages that the temperature difference stress is reduced through preheating, grain growth is inhibited through synchronous cooling, quenched structures are eliminated through slow cooling after welding, generation of microcracks on the cutting face is effectively inhibited through the synergistic effect of the three parts, the quality of the cutting face is remarkably improved, and the method is suitable for cutting machining of various high-manganese austenite steel plates.
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