一种免预热焊接用薄规格NM500耐磨钢及其制造方法
By optimizing the chemical composition and process flow of NM500 wear-resistant steel, the problem of balancing high hardness and preheating weldability in thin-gauge NM500 wear-resistant steel has been solved, achieving uniform microstructure and stable weldability. This makes it suitable for manufacturing thin-gauge NM500 wear-resistant steel that does not require preheating welding.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NORTHEASTERN UNIV CHINA
- Filing Date
- 2026-05-14
- Publication Date
- 2026-07-17
AI Technical Summary
Existing NM500 grade wear-resistant steel is difficult to balance high hardness and preheated weldability under thin-gauge conditions, and its microstructure and hardness uniformity are insufficient. Traditional single-stage controlled rolling and quenching processes are difficult to effectively coordinate microstructure refinement and weldability control.
By rationally designing the content of elements such as C, Cr, Mo, Ti, Nb, B, and N, and establishing the synergistic control relationship between (Ti+0.52Nb)/N and B/N, and combining a one-stage high-temperature rolling, rapid cooling, secondary reheating, two-stage rolling, quenching, and low-temperature tempering process, thin-gauge NM500 wear-resistant steel with uniform microstructure and stable hardness, mainly composed of tempered lath martensite, is obtained, achieving preheat-free welding.
While meeting the hardness requirement of >480HBW, it reduces the hardening tendency and cold cracking sensitivity of the weld heat-affected zone, and achieves uniformity of microstructure and properties in the width and thickness directions of the steel plate, making it suitable for stable welding under preheating-free temperature conditions.
Smart Images
Figure CN122189525B_ABST