1100MPa-grade ultrahigh-strength wire rod and preparation method thereof

A 1100MPa-grade ultra-high-strength wire rod with tailored chemical composition and manufacturing process addresses the welding material gap for Q1100E steel plates, achieving 1100MPa strength and -40°C toughness, facilitating efficient welding and reducing costs.

CN119177408APending Publication Date: 2024-12-24NANJING IRON & STEEL CO LTD
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Patent Information

Application Number
CN202411089696.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-09
Publication Date
2024-12-24

AI Technical Summary

Technical Problem

There is a lack of welding materials that can match the high-strength Q1100E steel plates, limiting their application in large and long-span equipment due to the high cost and cold crack sensitivity of existing high-strength welding wires, and the need for alternative connection methods that reduce the utilization rate of steel plate performance.

Method used

Development of a 1100MPa-grade ultra-high-strength wire rod with specific chemical compositions and a manufacturing process involving molten steel smelting, die casting, forging, rolling, and annealing, followed by drawing and copper-plating to create a solid gas shielded welding wire that meets low-temperature toughness and strength requirements.

Benefits of technology

The solution provides a cost-effective welding wire that achieves 1100MPa strength and -40°C toughness, enabling effective welding with Q1100E steel plates and improving processability, thus enhancing the application of high-strength steel plates.

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Abstract

The invention discloses a 1100 MPa grade ultrahigh strength wire rod which comprises the following components in percentage by weight: 0.065 wt% to 0.18 wt% of C, 1.13 wt% to 1.82 wt% of Si, 1.59 wt% to 1.97 wt% of Mn, 0.41 wt% to 0.98 wt% of Cr, 3.25 wt% to 4.62 wt% of Ni, 0.41 wt% to 0.98 wt% of Mo, less than or equal to 0.12 wt% of Cu, 0.04 wt% to 0.10 wt% of Ti, less than or equal to 0.002 wt% of P, less than or equal to 0.015 wt% of S, less than or equal to 0.5 wt% of V and the balance of Fe and inevitable impurities. The invention further discloses a preparation method of the wire rod. The strength can reach 1100 MPa while the low-temperature toughness of minus 40 DEG C is met, the solid gas shielded welding wire with the corresponding strength level is prepared, Q1100E is matched for welding, and the cost is low.
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Citation Information

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