30# steel and 35# steel plate cutting applications

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30# steel and 35# steel plate cutting applications
, 30# steel, 35# steel composition and structure

30# steel: The chemical composition mainly includes carbon, silicon, manganese, phosphorus, sulfur and other elements, of which the carbon content is about 0.30%. In addition, the microstructure of 30# steel is mainly composed of ferrite and pearlite.

35# steel: The chemical composition is similar to 30# steel, but the carbon content is slightly higher, about 0.35%. Its microstructure is mainly composed of martensite and bainite.

2. Mechanical properties of 30# steel and 35# steel

30# steel: Without heat treatment, its tensile strength is about 480MPa, its yield point is about 250MPa, and its elongation is about 22%. These values may change after heat treatment.

35# steel: Without heat treatment, its tensile strength is about 600MPa, yield point is about 350MPa, and elongation is about 20%. These values may change after heat treatment.

3. Physical properties of 30# steel and 35# steel

30# steel: The density is about 7.85g/cm³, the thermal conductivity is low, about 12W/(m·K), and the thermal expansion coefficient is about 11×10^-6/K. These properties give it good dimensional stability at high temperatures.

35# steel: density is about 7.80g/cm³, thermal conductivity is about 15W/(m·K), and thermal expansion coefficient is about 12×10^-6/K. These properties give it good dimensional stability at high temperatures.

4. Application of 30# steel and 35# steel

30# steel: Due to its good toughness, ductility, and low hardness, this steel is often used to manufacture parts that require higher toughness, such as building structures, mechanical parts, and shipbuilding. In addition, it is also commonly used in the manufacture of auxiliary parts for tools and molds.

35# steel: Due to its high strength and hardness, as well as good wear resistance, this steel is often used to manufacture parts that require high strength and hardness, such as cutting tools, molds and shaft parts. In addition, it is often used to manufacture parts that require good wear resistance.

5. Heat treatment of 30# steel and 35# steel

30# steel: usually annealed or normalized. Annealing can eliminate stress, improve cutting performance, and make the structure uniform. Normalizing treatment can refine the grains and improve the toughness of the material. For some parts that require increased hardness, quenching and tempering can be performed.

35# steel: usually quenched and tempered. Quenching increases strength and hardness but makes the material brittle. Tempering eliminates the brittleness caused by quenching while further improving strength and hardness. For some parts that need to improve toughness, annealing or normalizing can be performed.