Year1
- 产品规格：
- 齐全
Characteristics and scope of application
After quenching and tempering, it has high hardness and wear resistance, but low hot hardness, poor hardenability, easy deformation, low plasticity and strength. Used as various tools that require higher hardness and wear resistance, such as simple-shaped molds and punches, metal cutting tools, drilling tools, milling cutters for woodworking, countersunk drills, axes, chisels, longitudinal hand saws, As well as secondary tools such as benchwork assembly tools and rivet dies.
●Chemical composition:
Carbon:.~
Silicon:
Manganese:
Sulfur:
Phosphorus:
Allowable residual content of chromium.( When manufacturing lead bath quenched steel wire)
Nickel: Allowable residual content. (When manufacturing lead bath quenched steel wire)
Copper: Allowable residual content. (When manufacturing lead bath quenched steel wire)
●Mechanical properties Hardness: annealing indentation diameter. Quenching
●Heat treatment specifications and metallographic structure heat treatment specifications: sample quenching ~ ℃ water cooling.
Hot processing specifications: start temperature - ℃ end temperature ℃
Quenching specifications: quenching temperature - ℃ water cooling, water-oil double liquid cooling or alkali bath cooling quenching temperature r. Tempering temperature -℃.
●Production process
Generally, spring steel can be produced by electric furnace, open-hearth furnace or oxygen converter to produce high-quality spring steel with good quality or special properties, and can be refined by electroslag furnace or vacuum furnace. The specified content range of main elements such as carbon, manganese and silicon in spring steel is narrow. The chemical composition must be strictly controlled during smelting. When the silicon content is high, it is easy to form defects such as bubbles. When the steel ingot is not cooled properly after forging and rolling, it is easy to produce white spots. Therefore, the raw materials used for smelting must be dried to remove gases and inclusions as much as possible and the molten steel must be prevented from overheating. Special attention must be paid to decarburization and surface quality during the rolling process of spring steel. Severe decarburization of the steel surface will significantly reduce the fatigue limit of the steel. For high silicon spring steel, care should be taken to avoid graphitization. Therefore, the rolling stop temperature during hot processing should not be too low (°C) to avoid staying too long in the temperature range (~°C) where graphitization is easier to form. After the horse core spring is made, shot peening can produce residual compressive stress on the surface of the spring to offset part of the working stress on the surface and inhibit the formation of surface cracks, which can significantly increase the fatigue limit of the spring.
Typical application examples
Used in mold parts that require high hardness and wear resistance due to sliding wear, such as guide pins, bushings, ejector pins, etc.
, edge tools, cold heading dies, scrapers and files for wood processing.
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