Recently, through an academic conference on related spring steel knowledge, the specifications of spring steel and the classification of its uses have been determined. Now 888spring.com will introduce the types and uses of spring steel.
1) Brief description of spring steel
Manufacturers have high requirements for the material of springs that work under dynamic load conditions, high yield strength, high fatigue strength; when subjected to heavy loads, the plasticity does not deform; there is sufficient toughness and plasticity to prevent impact Suddenly snapped.
In fact, the most important thing about spring steel is that it has good elasticity. High-quality steel with a carbon content of 0.60% to 0.90% in carbon steel is the steel for making springs. However, the permeability of carbon spring steel is poor, and it is only suitable for small production. Springs with cross-sections and springs with large cross-sections need to be made of alloy steel. Due to the strengthening effect of alloying elements in alloy steel, its carbon content can be reduced to 0.5~0.7%. Chromium, vanadium, silicon, and manganese are the most spring steels. Commonly used alloy elements. Generally, high elasticity can be obtained by tempering at medium temperature after quenching. But at this time, it should be noted that because spring products have strict requirements for decarburization, high-temperature silicon carbide rod furnaces should not be used during quenching, but salt bath furnaces Handled as well.
We usually use hot-rolled square steel, round steel, flat steel, and spring steel with special-shaped cross-sections. The surface of the steel is required to be free from cracks, folds, scars, inclusions, delamination and pressed-in oxide scale.
2) Features of spring steel
The macrostructure of steel must not have defects such as white spots, shrinkage holes, cracks, delamination, bubbles, etc. Generally, looseness, center looseness, and segregation must not exceed level 3. The depth of the decarburized layer should not be greater than the percentage of the diameter or thickness. of two.
No. 65-85 of carbon steel, China Steel. There are two classifications of 65Mn, 55SiMn, 60SiMn, 50CrV in alloy steel.
3) Packaging and import and export production
Usually, we use electric furnace smelting, adding deoxidizer silicon and aluminum, injecting the steel ingot mold, through forging or rolling, to obtain various shapes of steel and forgings. Then through bare packaging, bundled delivery, iron wire or steel The band is bound, and there is a label indicating the furnace number, specifications and other imprints. The quality certificate should be attached to the import and export delivery, indicating the standards implemented and the test results specified in the standards. In China, the main manufacturers are: Dalian Steel plants, Shanghai Baosteel, Chongqing steel plants, etc. At present, there are a small number of export tasks with stable quality. Mainly exported to Hong Kong and Southeast Asia.
At present, there are many quality problems found in the import spring steel claims mainly imported from Japan, Switzerland, Brazil and other countries, such as: internal cracks, end cracks, rust, pits, scars, etc.; in addition, short weight and short length problems are also It has happened before, so inspections must be strengthened.
The main use of carbon steel is in various cylindrical coil springs and leaf springs in vehicles, automobiles, airplanes, etc.