45 carbon steel
Sunny Xinrui 45 carbon steel is a commonly used carbon quenched and tempered structural steel, also known as 45 steel, steel, the steel cold plastic general, annealing, normalizing than quenching and tempering slightly better, with high strength and Better machinability, after the appropriate heat treatment can be a certain degree of toughness, plasticity and wear resistance, the material source is convenient. Suitable for hydrogen welding and argon arc welding, not suitable for gas welding. Preheat before welding, after welding should be to stress annealing.
Processing: nitriding treatment: generally used for surface wear, the core impact of heavy-duty parts, the wear resistance than the quenching and tempering + surface hardening. Its surface carbon content of 0.8-1.2%, the core is generally 0.1-0.25% (0.35% in special cases). After heat treatment, the surface can be obtained hardness of 58-62 HRC, core hardness is low, impact resistance. After quenching the core will appear hard and brittle martensite, the advantages of loss of carburizing treatment. The use of carburizing process materials, carbon content is not high, to 0.30% of the core strength has been able to achieve very high, the application of rare. 0.35% no example, you can use quenched and tempered + high-frequency surface hardening process, wear resistance slightly worse than carburizing.
Cold pressing hair softening treatment: temperature 740-760 ℃, holding time 4-6h, to 50-100 ℃ / h cold speed, with the furnace down to the temperature of 600 ℃, baked air-cooled, before treatment hardness 197HBS, after treatment Hardness & lt; 156HBS & lt; / RTI & gt;
Normalizing specification: normalizing temperature 850-870 ℃, normalizing hardness 170-217HBS.
Quenched and tempered: quenching temperature 840 & plusmn; 10 ℃, water quenching; tempering temperature 600 ℃, baked air cooled.
45 steel do not use carburizing quenching heat treatment process.
Normalizing can improve the hardness of less than 160HBS rough cutting performance. The steel after quenching and tempering treatment, the comprehensive mechanical properties to be optimized in other carbon structural steel, but the steel hardenability is low, the water critical quenching diameter of 12 ~ 17mm, water quenching cracking tendency. When the diameter is greater than 80mm, the quenched and tempered or normalized, its mechanical properties are similar to the medium and small mold parts after quenching and tempering treatment can get a higher strength and toughness, and large parts, then the normalizing treatment is appropriate , So this steel is usually used in the quenched or normalized state. Desong 45 steel for high-quality carbon structural steel, hardness is not high, easy cutting, mold commonly used to do the template, the tip, guide column, quenched and tempered parts have a good overall mechanical properties, widely used in the Important structural parts, especially those working under alternating loads, bolts, gears and shafts. Similar grades are Sweden 1650, France C5, Japan S45C carbon tool steel.
45
Chemical Composition(%)max
C
Si
Mn
Cr
Ni
Cu
P
S
0.42-0.50
0.17-0.37
0.50-0.80
0.25
0.25
0.25
0.035
0.035
Processing: nitriding treatment: generally used for surface wear, the core impact of heavy-duty parts, the wear resistance than the quenching and tempering + surface hardening. Its surface carbon content of 0.8-1.2%, the core is generally 0.1-0.25% (0.35% in special cases). After heat treatment, the surface can be obtained hardness of 58-62 HRC, core hardness is low, impact resistance. After quenching the core will appear hard and brittle martensite, the advantages of loss of carburizing treatment. The use of carburizing process materials, carbon content is not high, to 0.30% of the core strength has been able to achieve very high, the application of rare. 0.35% no example, you can use quenched and tempered + high-frequency surface hardening process, wear resistance slightly worse than carburizing.
Cold pressing hair softening treatment: temperature 740-760 ℃, holding time 4-6h, to 50-100 ℃ / h cold speed, with the furnace down to the temperature of 600 ℃, baked air-cooled, before treatment hardness 197HBS, after treatment Hardness & lt; 156HBS & lt; / RTI & gt;
Normalizing specification: normalizing temperature 850-870 ℃, normalizing hardness 170-217HBS.
Quenched and tempered: quenching temperature 840 & plusmn; 10 ℃, water quenching; tempering temperature 600 ℃, baked air cooled.
45 steel do not use carburizing quenching heat treatment process.
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