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Martensitic stainless steel is a martensite crystal structure stainless steel alloy. Through aging and heat treatment, it may be toughened and tempered. Austenitic, ferritic, duplex, and precipitation hardened stainless steel are the other major varieties.
They may contain some Ni (Type 431), which allows for a greater Cr and/or Mo concentration, boosting corrosion resistance, and toughness because the carbon level is also lower. EN 1.4313 (CA6NM) has high mechanical characteristics, castability, and weldability. It is utilized in practically all hydroelectric turbines across the world, notably those at China’s massive Three Gorges Dam.
B, Co, Nb, and Ti additions increase high temperature characteristics, notably creep resistance. This is used to generate heat.They can be hardened by heat treatment (particularly, quenching and stress relief, or quenching and tempering (QT).The alloy composition, as well as the rapid cooling rate of quenching, allow for the development of martensite.
Untempered martensite is fragile due to its poor hardness.Tempered martensite offers steel considerable hardness and toughness, as seen below; mostly used in medical equipment (scalpels, razors, and internal clamps).When formability, softness, and other properties are required in fabrication, steel with the highest carbon content is frequently utilized in soft form.
By hardening and tempering with increasing carbon, it is feasible to achieve tensile strength in the range while maintaining appropriate toughness and ductility. In this state, these steels have a wide range of general applications where mild corrosion resistance is required.
In addition, with the greater carbon range in the hardened and gently tempered condition, tensile strength with reduced ductility may be generated.Unlike austenitic stainless steel, martensitic stainless steel may be nondestructively evaluated using magnetic particle inspection.
Martensitic stainless steels, which vary in carbon content, are frequently used in pumps, valves, and boat shafts due to their corrosion resistance and high strength.
They are also utilized for wear resistance in cutlery, medical equipment (scalpels, razors, and internal clamps), ball bearings, razor blades, polymer injection molds, and bicycle and motorcycle brake discs.
The Global Martensitic Stainless Steel Market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
Ansteel Group has produced martensitic stainless steel seamless pipes with success. This product expands the seamless steel tube continuous rolling mill high-alloy steel pipe production process, solves the problem of the martensitic stainless steel perforated plug’s short service life, and fills a gap in Anshan Iron and Steel Group’s high-CO2 corrosion-resistant oil well pipe products.
The Angang Iron and Steel Research Institute’s seamless steel pipe research group has worked closely with production plants and relevant departments to begin with composition design, process design, special tool design, and so on, and to repeatedly study and fully master martensitic stainless steel seamless steel pipes.
Prior to trial production, the research group held meetings to review process parameters, validate production preparations, and conduct technical research for production challenges, which alleviated the production bottleneck.
To finish the service life test of the plug as quickly as possible, the research group aggressively promoted plug manufacturing guidelines and other production tools to assure the plug’s quality and delivery. The created unique plug’s service life was substantially increased and progressed to an industry-leading level.
