Light board 45 # 45 # 45 # fine board S45C place plate light board

The steel cold plastic in general, annealing, normalizing to be slightly better than quenching, with high strength and good machinability, obtained by appropriate heat treatment after a certain toughness, ductility and wear resistance, material sources convenience. Suitable for hydrogen bonding and welding, not suitable for welding. Preheating before welding, should be to stress annealing after welding. Can improve the hardness of less than 160HBS normalizing rough cutting. After the steel after quenching, its mechanical properties to be optimized for other carbon structural steel, but the steel hardenability is low, the water critical quenching diameter of 12 ~ 17mm, has a tendency to crack when the water quenching. When the diameter is larger than 80mm, after quenching or normalizing, similar to its mechanical properties, for medium and small mold parts after quenching obtain higher strength and toughness, and large parts, places appropriate normalizing Therefore, this steel is used at quenching or normalizing state. Chemical composition containing carbon (C) the amount is 0.42 ~ 0.50%, Si content is 0.17 ~ 0.37%, Mn content of 0.50 ~ 0.80%, Cr content ≤0.25%, Ni content ≤0.30%, Cu content ≤0.25%. Density of 7.85g / cm3, the elastic modulus of 210GPa, Poisson's ratio 0.269. Recommended heat treatment temperature heat treatment: normalizing 850, 840 quenching and tempering 600. No. 45 for the high-quality carbon steel structural steel, high hardness and easy machining, mold template used to do, shoot the child, guide posts, etc., subject to heat treatment. 1.45 No. of steel after quenching and tempering did before, hardness greater than HRC55 (up to HRC62) is qualified. Maximum practical hardness as HRC55 (high-frequency quenching HRC58). No. 2.45 do not use steel carburizing heat treatment process. Carburizing treatment is generally used for surface abrasion, impact-resistant heavy duty core parts, its wear resistance than quenched + surface hardening high. 0.8--1.2% carbon content of the surface, the core is generally 0.1--0.25% (under special circumstances 0.35%). After heat treatment, the surface can get very high hardness (HRC58--62), low core hardness, impact resistance. If you use 45 steel carburizing, quenching the core will be hard and brittle martensite, losing the advantages of carburizing process. Carburizing process materials, carbon content is not high, to 0.30% of the core may have reached a very high strength, the application of rare. 0.35% have never seen an instance, have introduced only in the textbooks. Can be used quenching + high-frequency surface hardening process, wear slightly worse than the carburizing. Processing specification cold softening rough handling specifications: temperature 740 ~ 760 ℃, holding time of 4 ~ 6h, with 50 ~ 100 ℃ / h cooling rate, with the oven temperature down to ≤600 ℃, cooled baked, pre-treatment hardness ≤ 197HBS, after treatment hardness ≤156HBS. Normalizing Specification: normalizing temperature 850-870 ℃, after normalizing the hardness 170-217HBS. Quenching specifications: quenching temperature 840 ± 10 ℃, water quenching; tempering temperature 600 ± 10 ℃, cooled baked. Implementation of standards GB / T699-1999 standard 45 steel recommend normalizing heat treatment temperature is 850 ℃, 840 ℃ quenching, 600 ℃ tempered, achievable performance for yield strength ≥355MPa GB / T699-1999 standard tensile steel 45 strength ≥600MPa, yield strength ≥355MPa, elongation ≥16%, reduction of ≥40%, the impact energy of 39J. 45 steel processing requirements of 45 steel quenched hardness between HRC20 ~ HRC30; 45 steel quenched hardness between HRC55 ~ 58, the limit of up to HRC62; 45 steel to be placed 15-20 days to use, is due to the aging processing, the properties of steel to stabilize the practical application of the maximum hardness of HRC55 (HRC58 45 induction hardening of steel, is the name for GB, JIS called: S45C, ASTM called 1045,080M46, DIN called :. C45 45 gauge steel for high-quality carbon structural steel, high hardness and easy machining, mold template used to do, shoot the child, guide posts, etc., but there is no need to heat quenching and tempering of steel until after 1.45, hardness greater than HRC55 (up to HRC62) is qualified. maximum hardness of the practical application of HRC55 (high-frequency quenching HRC58). 2. 45 do not use steel carburizing heat treatment process. parts with good mechanical properties after quenching, widely used in a variety of important structural parts, especially those under the alternating load rod work, bolts, gears and shafts, etc. However, lower surface hardness, do not wear. Available quenched + surface hardening to improve the surface hardness of parts .