1.4122 stainless steel is a martensitic precipitation hardening stainless steel, also widely known as X2CrNi17-7, which belongs to the German standard stainless steel. It is available in stainless steel plates, round bars, pipes and other materials.
1.4122 stainless steel is a medium carbon stainless steel with high corrosion resistance and good mechanical properties, especially suitable for making various mechanical parts. This article will introduce its chemical composition, physical properties, mechanical properties, application areas and other aspects in detail.
Magnetism of 1.4122 stainless steel
As a martensitic stainless steel, 1.4122 is magnetic and suitable for applications that require magnetic adhesion. For example, processing such as grinding, milling or corrosion can be carried out on machines with magnetic adhesion.
Chemical composition and properties of 1.4122 stainless steel
Chromium (Cr): 17%
Molybdenum (Mo): 1%
Carbon (C): 0.39%
Due to its high chromium content, 1.4122 has strong corrosion resistance and maintains good strength and hardness at high temperatures. Its typical tensile strength can reach 1100 N/mm² and its yield strength is 500 N/mm², which is suitable for industrial applications with high strength and heavy loads.
Corrosion resistance of 1.4122 stainless steel shows good corrosion resistance in moderately corrosive environments, especially in environments with low chloride ion concentrations. Its chromium content is 17%, which makes it highly resistant to corrosion in environments such as organic acids and citric acid. Finely ground or polished 1.4122 surfaces can further improve its corrosion resistance, especially for precision machinery and parts requiring high durability.
Hardness and heat treatment
The hardness of 1.4122 stainless steel usually ranges from 30HRC to 48HRC, and its mechanical properties can be further improved by appropriate heat treatment. Common heat treatment methods include:
Stress relief annealing: heating to 600-650°C and cooling in an oven to eliminate internal stress.
Tempering: heating to 650-750°C and then air cooling to improve the toughness of the steel and prevent cracks caused by overhardening.
Hardening: Heating to 980-1060°C and then quenching can significantly increase the hardness and wear resistance of the steel.
Forging: Forging is performed by heating to 800-1150°C and then maintaining the processing in the temperature range above 950°C to ensure the mechanical properties of the steel.
Welding and processing
1.4122 stainless steel is difficult to weld and is generally not recommended. If welding is required, the steel should be preheated to 300-400°C and tempered after welding to avoid cracking in the heat affected zone. Proper heat treatment can reduce the risk of stress and cracks, thereby improving the quality of the weld.
1.4122 stainless steel application areas
1. Manufacture of bearings, gears, blades, scrapers and scraper blades, etc.
2. Manufacture of molds, mold substrates and templates, etc.
3. Manufacture of brake systems, such as brake discs and brake calipers.
4. Manufacture of heat exchangers, coolers and other heat exchange equipment.
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