Nitrogen containing martensitic stainless steel for cutting tool and manufacturing method of nitrogen containing martensitic stainless steel

Abstract

The invention relates to nitrogen containing martensitic stainless steel for a cutting tool and a manufacturing method of the nitrogen containing martensitic stainless steel. According to the technical scheme, chemical components of the nitrogen containing martensitic stainless steel for the cutting tool comprise 0.45wt%-0.70wt% of C, 13.0 wt%-17.0wt% of Cr, 0.10wt%-0.25wt% of N, 0.50wt%-0.80wt% of Si, 0.40wt%-1.0wt% of Mn, 0.0015wt%-0.0065wt% of Ca, not larger than 0.20wt% of V, not larger than 0.025wt% of Nb, not larger than 0.025wt% of Als, not larger than 0.03wt% of Mo, not larger than 0.008wt% of P, not larger than 0.005wt% of S and the balance Fe and inevitable elements. Meanwhile, the above chemical components meet the condition that C+N is 0.60-0.85wt%. The manufacturing method ofthe nitrogen containing martensitic stainless steel for the cutting tool comprises the steps of vacuum induction smelting, normal-pressure nitrogen increasing, casting, casting blank heating, rolling,quenching and tempering. The nitrogen containing martensitic stainless steel has the advantages that the alloy components are simple, the process is simple and convenient, the production cost is low,and large-scale production is easy. The manufactured nitrogen containing martensitic stainless steel for the cutting tool is high in hardness and good in toughness.

Description

technical field [0001] The invention belongs to the technical field of martensitic stainless steel. Specifically relates to a nitrogen-containing martensitic stainless steel for cutting tools and a manufacturing method thereof. Background technique [0002] Martensitic stainless steel traditionally used in the manufacture of cutting tools, such as 4-5Cr15MoV series and 9Cr18MoV, after quenching and low-temperature tempering, has a hardness of 56-58HRC, certain toughness and processing performance, and corrosion resistance under general corrosion conditions. Therefore, it has been applied in the cutting tool manufacturing industry. With the continuous advancement of metallurgical technology, the cutting tool manufacturing industry has higher and higher technical and cost requirements for martensitic stainless steel, and puts forward stricter requirements for its structure and performance control, especially for high-end civilian kitchens, machinery Cutting tools manufacture...

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Problems solved by technology

"A kind of martensitic stainless steel and its manufacturing method" (CN104471095) patent technology, through the thin strip casting and rolling method, the rapid cooling casting method is used to manufacture martensitic stainless steel with a size of 1mm or less, and the size of the residual carbide is less than 10μm. The hardness after fire is above 55HRC, but the requirements for equipment and manufacturing process are high and difficult, which is not conducive to the promotion of metallurgical enterprises

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