Corrosion-resisting stainless steel and manufacturing process thereof

Abstract

The invention provides corrosion-resisting stainless steel and a manufacturing process of the corrosion-resisting stainless steel. The corrosion-resisting stainless steel comprises the following chemical components in percentage by weight: less than 0.10% of C, 15-22% of Cr, 0.6-3.0% of Mo, 9.0-10.5% of Ni, 0.40-2.0% of B, less than 0.5% of Cu, less than 1% of Si, less than 0.9% of Mn, 0.2-0.6% of Ti, less than 0.3% of Al, less than 0.05% of N, less than 0.04% of P, less than 0.01% of S and inevitable impurity elements. Therefore, the corrosion-resisting stainless steel has higher hot and cold fatigue resistance, anti-fracture toughness, thermal shock resistance, good hot-working property, and welding performance; the smelting process is simple; and the processing cost is low.

Description

technical field [0001] The invention belongs to the technical field of stainless steel materials, and relates to a corrosion-resistant metal material and a manufacturing process thereof, in particular to a corrosion-resistant stainless steel and a manufacturing process thereof. Background technique [0002] Boron is a special element with an atomic number of 5, which is between metals and nonmetals, and can combine with metals and nonmetals. Boron is the main alloying element in high-chromium cast steel. Adding an appropriate amount of B to high-boron high-chromium cast steel can replace some carbon atoms in carbides to form boron-containing alloy carbides, and make the carbide volume fraction increases with increasing boron content. And the average hardness ratio of boron-containing carbides (Cr, Fe) 7 C 3 Type carbides are improved, and high boron-containing stainless steel is more likely to induce martensitic transformation by friction, resulting in work hardening, and...

AI Technical Summary

Problems solved by technology

Since the hot workability decreases when the boron content increases, it is necessary to process while preventing the temperature of the workpiece from falling, and as a result, it is necessary to increase the number of repetitions of heating and processing

Therefore, an increase in the boron content or a thin-thickness machining of the steel will lead to an increase in manufacturing costs

[0007] In addition, in the surfacing welding of boron-containing stainless steel, sufficient welding thickness is ensured to prevent cracks, resulting in an increase in the number of weld passes and the number of welders

In addition, when welding cracks occur, this will become the starting point and then cause edge cracks, so it is difficult to completely prevent edge cracks

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