S700MC steel is a low-alloy high-strength steel for Baosteel’s hot-rolled pickling and cold forming. It is produced by advanced smelting technology and controlled rolling and controlled cooling process. It has low carbon, low sulfur and low phosphorus content, and has excellent cold forming performance and welding performance. low carbon microalloyed steel.
What are the characteristics of S700MC hot rolled pickled steel?
The characteristics of S700MC hot-rolled pickling steel are as follows:
High strength: S700MC steel has high yield strength and tensile strength, usually between 650-700 MPa.
Excellent plasticity: S700MC steel has excellent formability and weldability, and is suitable for various complex forming operations.
Good impact toughness: S700MC steel has good impact toughness and can maintain strength and toughness at low temperatures.
Good corrosion resistance: S700MC steel is processed by hot-rolled pickling process, and the surface is smooth, flat and oxide-free, thereby improving its corrosion resistance.
Lightweight: Despite its high strength, S700MC steel has a relatively low density, making it lighter than other comparable steels.
Overall, S700MC hot-rolled pickled steel is characterized by high strength, excellent formability, good impact toughness, excellent corrosion resistance, and light weight. These characteristics make it widely used in the manufacture of heavy machinery, vehicle structural parts, excavation equipment and other industrial applications requiring high strength and toughness.
What is the chemical composition of S700MC hot rolled pickling steel?
The chemical composition of S700MC hot-rolled pickling steel generally meets the following requirements:
Carbon (C) content: about 0.12%
Silicon (Si) content: 0.15-0.60%
Manganese (Mn) content: about 1.60%
Phosphorus (P) content: about 0.025%
Sulfur (S) content: about 0.015%
Chromium (Cr) content: about 0.30%
Nickel (Ni) content: about 0.50%
Molybdenum (Mo) content: about 0.20%
These chemistries can be fine-tuned according to different standards and specifications, but generally fit within these ranges. Note that the exact chemical composition may vary by manufacturer or supplier.
What are the mechanical properties of S700MC hot-rolled pickled steel?
S700MC is one of the grades of high-strength low-alloy steel with excellent mechanical properties. Its typical mechanical properties are as follows:
Tensile strength: minimum about 700 MPa
Yield strength: minimum about 650 MPa
Elongation: about 10% minimum
Fracture Toughness (Charpy V-notch): Typically 20 J minimum
It should be noted that these values may vary slightly due to factors such as manufacturers, process parameters during hot rolling and pickling. Therefore, in practical applications, it is recommended to carry out mechanical performance testing and evaluation according to specific situations.
What is the process of S700MC hot-rolled pickled steel?
The process of S700MC hot-rolled pickling steel mainly includes the following steps:
Heating and rolling: S700MC steel billet is heated to a proper temperature, and then rolled through a hot rolling mill to form the required thickness and shape.
Pickling: After hot rolling, some impurities such as oxides and scales may remain on the surface of the S700MC steel plate, which can be removed by pickling. Hydrochloric acid solution is usually used for immersion pickling, and parameters such as pickling time, acid concentration and temperature need to be determined according to specific conditions.
Washing and drying: After pickling, the steel plate needs to be thoroughly rinsed with clean water to remove acid residue. Then the moisture on the surface of the steel plate is evaporated by the drying equipment.
Oiling or painting: In order to prevent the surface of the steel plate from being oxidized again, it is often necessary to apply a protective coating on the surface, such as applying a layer of anti-rust oil or spraying a layer of paint.
The above is the main process of S700MC hot-rolled pickling steel.
How to process S700MC steel?
Machining S700MC steel requires specific techniques and tooling to ensure that its high strength properties are maintained. The first step is choosing the right equipment to cut, bend and weld the material. This includes precision cutting with plasma cutters or laser machines, and specialized bending machines that can handle the thickness of the material.
When it comes to welding, it is important to pay attention to preheat and post weld heat treatment temperatures to prevent any cracks or distortions. Additionally, the use of low-hydrogen electrodes or flux-cored wires can help avoid hydrogen-induced cracking.
Another critical aspect of machining S700MC steel is ensuring proper pickling and oiling prior to cold forming. Pickling removes any scale from the surface of the material, while oiling helps reduce friction during the forming process.
All safety guidelines must be followed when handling S700MC steel due to its high strength and potential hazards such as sharp edges during cutting. By following these best practices for machining S700MC steel, manufacturers can take advantage of its superior mechanical properties in a variety of applications, such as heavy machinery components and structural parts in automotive manufacturing.
Heat Treatment of S700MC Hot Rolled Pickled Steel
S700MC hot-rolled pickled steel is a high-strength, low-alloy steel, mainly used in the manufacture of heavy machinery and vehicle structural parts. Heat treatment is required before use to obtain the desired mechanical properties.
Generally speaking, the heat treatment of S700MC hot-rolled pickled steel includes two steps: tempering and normalizing.
Tempering is to heat the hot-rolled and pickled steel to about 500°C, then keep it warm for a period of time, and then cool it slowly. This step can eliminate the residual stress inside the steel and give it a certain toughness.
Normalizing is to heat the tempered steel to about 900°C and then cool it rapidly. This step refines the grains of the steel and increases its hardness and strength.
It should be noted that during heat treatment, the heating and cooling rate and temperature must be well controlled, otherwise the mechanical properties of the steel will be affected.
The best application field of S700MC steel
S700MC steel is commonly used in structural applications with high strength and low weight requirements such as:
Automobile industry: Widely used in the manufacture of auto parts, such as door hinges, seat slides, recliners, airbags, seat belt buckles, etc.
Aerospace industry: S700MC steel can be used to make structural components of aircraft, such as fuselage shells, wings and other key components. Due to its high strength and light weight, the aircraft can be more fuel-efficient and improve flight performance.
Heavy transport vehicles: S700MC steel can be used to manufacture structural components of large vehicles such as trucks and trailers. Due to their high strength and good durability, these vehicles can be stronger and safer when carrying heavy loads.
Machinery manufacturing: S700MC steel can also be used to manufacture various kinds of machinery and equipment, such as pressure vessels and bridges, etc.
In summary, S700MC steel is a very good high-strength steel, and its best application areas are mainly concentrated in structural applications that require high strength and low weight.
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