Ready supply 70mn steel plate 70mn spring steel plate 70mn spring steel plate

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Spring steel heat treatment specifications and metallographic structure heat treatment specifications: quenching 3℃, oil cooling and tempering (3℃ when necessary). Metallographic structure: extremely fine pearlite + a small amount of proeutectoid ferrite. Spring steel hardness, spring steel composition, spring steel price, spring steel properties, spring steel polishing properties, pure manganese-containing spring steel, for example, the manganese content is...~. Increasing the manganese content can improve the hardenability and strength of steel and reduce the tendency of decarburization. The disadvantage is that it has overheating sensitivity and temper brittleness, and is prone to quenching cracks, so it is only suitable for manufacturing various small-sized flat springs and round springs. Silicon manganese spring steel is the main type of hot-rolled alloy spring steel. There are four steel grades in China: The silicon content is .~., and the manganese content is .~. Adding silicon to steel can significantly increase the elastic limit and yield-to-strength ratio, improve tempering stability, but it is easy to form inclusions such as silicates and increase decarburization sensitivity. When the carbon and silicon contents in steel are both high, carbon is prone to graphitization. This type of steel is widely used to make shock-absorbing leaf springs and coil springs on automobiles, tractors, and motorcycles, as well as springs that are required to withstand high stress. Steel used to make springs or parts with similar spring properties. It has high elastic limit, fatigue limit (especially notch fatigue limit) and certain impact toughness and plasticity. It is mainly used under the conditions of impact, vibration and other dynamic loads or long-term periodic alternating stress. Therefore, springs working in various states must have good surface quality and high fatigue resistance. In terms of process performance, spring steel that needs to be quenched and tempered should have a certain degree of hardenability, be difficult to decarburize, have low overheat sensitivity and high plasticity, and be easy to form in a hot state. The steel wire used to make small-size springs must have uniform hardness and a certain degree of plasticity. Category spring steel can be divided into hot-rolled spring steel and cold-drawn (rolled) spring steel according to the production method. Hot rolled spring steel includes manufacturing spiral
Chemical composition
Carbon: .~
Silicon: .~
Manganese.~
Sulfur:
Phosphorus:
Chromium:
Nickel
Copper:
Physical properties
Mechanical properties Tensile strength:
Yield strength:
Elongation ():
Reduction of area ():
Hardness: not heat treated, B annealed steel,
Sample size: The sample size is
Heat treatment specifications and metallographic structure
Heat treatment specifications: Normalizing, ℃.
Characteristics and scope of application
The hardenability is better than steel. After heat treatment, it can obtain better strength than steel. During heat treatment, it has overheating sensitivity and tempering brittleness, and is prone to quenching cracks. Poor cold plastic deformation ability and poor weldability. Working parts that are subjected to large stress and wear conditions, such as various spring rings, spring washers, thrust rings, locking rings, and clutch discs, are used to manufacture wear-resistant and large-load mechanical parts, such as spring rings and spring washers. , thrust ring, clutch plate, locking ring, coil spring, etc.