A kind of high temperature resistant martensitic stainless steel and its manufacturing method

Abstract

The invention discloses a high temperature resistant martensitic stainless steel, comprising the following chemical components: 0.11-0.15 wt% of C, 0.50-0.80 wt% of Mn, no larger than 0.10 wt% of Si, 9.80-11.50 wt% of Cr, 0.60-0.80 wt% of Ni, 1.00-1.30 wt% of Mo, 0.13-0.23 wt% of V, no larger than 0.10 wt% of Al, 0.09-0.15 wt% of Nb, 0.25-0.40 wt% of W, 0.050-0.080 wt% of N, no larger than 0.010 wt% of P, no larger than 0.005 wt% of S, and the balance consisting of Fe and inevitable impurities. Accordingly, the invention further discloses a method for smelting with vacuum induction and electro slag remelting to produce the martensitic stainless steel. The produced martensitic stainless steel has low content of impurity elements, good quality of steel, excellent high temperature resistance, good combination of strength and toughness, and high yield.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a martensitic steel grade and a manufacturing method thereof. Background technique [0002] Martensitic stainless steel is a kind of stainless steel whose properties can be adjusted through heat treatment. At present, the Cr13 type martensitic stainless steel is used in a relatively large amount. This type of stainless steel is generally used to make parts such as blades, fasteners, pump shafts, valves, bolts, etc., but this type of martensitic stainless steel can only be used in low-temperature working environments, and the general working temperature is below 300 °C; In addition, this type of martensitic stainless steel does not have high requirements for the content of impurity elements such as S, P, and Si and Mn elements in the chemical composition, which is basically the same as that of other similar stainless steels. However, there are too many impurity elements in the steel, wh...

AI Technical Summary

Problems solved by technology

[0008] (1) Due to the adoption of vacuum induction + vacuum self-consumption double vacuum process for smelting, the smelting cost is high;

[0009] (2) Vacuum consumable remelting process is used for smelting without slag protection. The surface quality of the steel ingot is not as good as that of the electroslag remelted steel ingot. Yield rate;

[0010] (3) The steel requires the control of N elements and Mn elements. These two elements are easy to volatilize in vacuum smelting, especially the N element, and the recovery rate is very unstable in vacuum. bring some difficulties

The publication number is CN1891846, and the publication date is January 10, 2007. A heat-resistant martensitic stainless steel is disclosed in the Chinese patent document named "martensitic stainless steel". Form carbides with C elements to strengthen the matrix and improve the heat resistance of steel, but this steel does not contain Ni elements and has high carbon content, so its toughness and corrosion resistance are low

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