Hongyuan supplies 45# mold steel 45# round bar plate wholesale price genuine ultra-low price

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Characteristics Commonly used medium carbon quenched and tempered structural steel. The cold plasticity of this steel is average. Annealing and normalizing are slightly better than quenching and tempering. It has higher strength and better machinability. After appropriate heat treatment, it can obtain a certain degree of toughness, plasticity and wear resistance. Material source convenient. Suitable for argon arc welding, not suitable for gas welding. Preheating is required before welding, and stress relief annealing should be performed after welding.
Normalizing can improve the cutting performance of blanks with hardness less than B. After quenching and tempering treatment, the comprehensive mechanical properties of this steel should be optimized compared to other medium carbon structural steels, but the hardenability of this steel is low, the critical hardenable diameter in water is ~, and it has a tendency to crack during water quenching. When the diameter is larger than the diameter, their mechanical properties will be similar after quenching and tempering or normalizing. Medium and small mold parts can obtain higher strength and toughness after quenching and tempering, while normalizing is appropriate for large parts. Therefore, this steel is usually used in a quenched, tempered or normalized state.
Liquidus temperature
Around ℃, carbon content.~.
Reference corresponding steel numbers: Chinese B standard steel number, Japanese standard steel number, German standard material steel number. 3, German standard steel number, British B standard steel number, French standard steel number, French standard steel number, Italian standard steel number, Belgian B standard steel Swedish standard steel number Spanish standard steel number. United States/standard steel number International Organization for Standardization standard steel number.
Mechanical properties
Normalizing:
Quenching:
Tempering:
Tensile strength: not less than
Yield strength: not less than
Elongation Length rate:
Shrinkage rate:
Impact energy:
Steel delivery status hardness:
Hot rolled steel:
Annealed steel:
Ingredients The main components are: (Iron element), and contains the following small amounts of elements:
:.~
:.~.3
.~
:.3
:.3
:

:.[]
Density./3, elastic modulus, Poisson's ratio..
Treatment method heat treatment
Recommended heat treatment temperature: normalizing, quenching, tempering.
After quenching and before tempering, steel with a hardness greater than (maximum) is qualified.
The highest hardness for practical application is (high frequency quenching).
Do not use the heat treatment process of carburizing and quenching for grade steel.
Carburizing treatment
Generally used for heavy-duty parts with wear-resistant surface and impact-resistant core. Its wear resistance is higher than that of tempering + surface quenching. The carbon content on its surface is .., and the core is generally .. (use .3 in special cases). After heat treatment, the surface can obtain high hardness (), the core hardness is low, and it is impact resistant.
If steel is carburized, hard and brittle martensite will appear in the core after quenching, losing the advantages of carburizing. The carbon content of materials using carburizing technology is not high, and the core strength can reach very high by .3, which is rare in applications. .3 I have never seen an example, it is only introduced in textbooks. The process of quenching and tempering + high-frequency surface quenching can be used, and the wear resistance is slightly worse than carburizing.
Processing Specifications
Specifications for softening treatment of cold-pressed blanks: temperature ~ ℃, holding time ~ at a cooling rate of ~ ℃ /, with the furnace lowering to the temperature ℃, air cooling out of the furnace, hardness B before treatment, treatment Post hardness B.
Normalizing specifications: Normalizing temperature -℃, hardness after normalizing.
Quenching and tempering treatment specifications: quenching temperature ℃, water-cooling quenching and tempering temperature ℃, air cooling out of the furnace.
In the implementation of the standard
B/-The recommended heat treatment temperature for steel specified in the standard is normalizing at ℃, quenching at ℃, and tempering at ℃, and the achieved performance is the yield strength
B/-The steel resistance specified in the standard Tensile strength, yield strength is 3, elongation, area reduction, and impact energy are 3.
The processing requires that the quenching and tempering hardness of the steel is between ~3
The quenching hardness of the steel is between ~, and the limit value can reach
The steel must be left for - days before it can be used, because it needs to be aged. To stabilize the properties of steel,
the highest hardness for practical application is (high frequency quenching).
Steel is high-quality carbon structural steel with low hardness and easy to cut. It is often used as templates, pins, guide posts, etc. in molds, but it must be heat treated.
.After quenching and before tempering, steel is qualified if its hardness is greater than (maximum).
The highest hardness for practical application is (high frequency quenching).
.Do not use the heat treatment process of carburizing and quenching for steel.
The parts after quenching and tempering treatment have good comprehensive mechanical properties and are widely used in various important structural parts, especially those connecting rods, bolts, gears and shafts that work under alternating loads. However, the surface hardness is low and not wear-resistant. Quenching and tempering + surface quenching can be used to improve the surface hardness of the parts.