**Chemical Composition, Mechanical Properties, and Applications of 37SiMn2MoV**
**Introduction to 37SiMn2MoV**
Material Name: Alloy Structural Steel
Grade: 37SiMn2MoV
Standard: GB/T 3077-1988
This is a high-performance quenched and tempered steel known for its excellent mechanical properties. It offers high hardenability, strength, and toughness after heat treatment. This makes it ideal for manufacturing large components that are subjected to heavy loads. Common applications include shafts, gears, rotors, connecting rods, and high-pressure seamless tubes used in heavy machinery. It's also widely used in petrochemical industries as pressure vessels and for making large bolts. The material can operate within a temperature range of -20°C to 520°C, and it’s suitable for large bolt fasteners operating below 450°C. Additionally, it can be used as an alternative to other steels like 35CrMo or 40CrNiMo. When quenched and tempered at low temperatures, it can function as ultra-high-strength steel.
**Chemical Composition**
The chemical composition of 37SiMn2MoV includes:
- Carbon (C): 0.33–0.39%
- Silicon (Si): 0.60–0.90%
- Manganese (Mn): 1.60–1.90%
- Sulfur (S): ≤0.35%
- Phosphorus (P): ≤0.35%
- Chromium (Cr): ≤0.30%
- Nickel (Ni): ≤0.30%
- Copper (Cu): ≤0.30%
- Vanadium (V): 0.05–0.12%
- Molybdenum (Mo): 0.40–0.50%
**Mechanical Properties**
The mechanical properties of 37SiMn2MoV are as follows:
- Tensile Strength (σb): ≥980 MPa (100)
- Yield Strength (σs): ≥835 MPa (85)
- Elongation (δ5): ≥12%
- Reduction of Area (ψ): ≥50%
- Impact Work (Akv): ≥63 J
- Impact Toughness (αkv): ≥78 J/cm² (8)
- Hardness: ≤269 HB
- Sample Size: 25 mm
**Heat Treatment Specifications**
- Quenching: 870°C, water or oil cooling
- Tempering: 650°C, water or air cooling
- Delivery Condition: Heat-treated (normalizing, annealing, or high-temperature tempering) or non-heat-treated, depending on the contract requirements.
**Summary**
37SiMn2MoV is a versatile alloy structural steel with outstanding mechanical performance. Its combination of strength, toughness, and hardenability makes it suitable for critical engineering applications. Whether used in heavy machinery, pressure vessels, or high-strength fasteners, this steel provides reliable performance under demanding conditions. Proper heat treatment ensures optimal properties, and its flexibility allows it to replace similar grades such as 35CrMo and 40CrNiMo.
Editor: Hardware Business Network Information Center
Source: [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
Image: [Chemical composition and mechanical properties of 37SiMn2MoV](http://i.bosscdn.com/blog/12/07/08/510559.jpg)
Aluminum alloy sunshade window is a product that combines sunshade function with windows, with the following characteristics:
1. Structural design
Frame
Made of aluminum alloy profiles, aluminum alloy has high strength, light weight, corrosion resistance, and can ensure the stability of the window structure. Its profiles can be made into different shapes and sizes according to design requirements to meet the requirements of various building openings.
Sunshade part
Common sunshade methods include built-in sunshade blinds and external sunshades.
Built-in sunshade blinds are blinds installed between two layers of glass, and the amount of sunlight entering is controlled by adjusting the angle of the blinds. This method can effectively protect the blinds from the influence of the external environment, reduce the damage to the blinds by dust, rain, etc., and also enhance the overall aesthetics of the window.
External sunshades are sunshades installed on the outside of the window, and the position of the sunshade can be adjusted according to the angle of the sun. The sunshade effect of the external sunshade is more direct, and it can block more sunlight heat from entering the room, but it is necessary to consider its impact on the appearance of the building and its wind and rain protection performance.
2. Functional characteristics
Shading and heat insulation
Effectively block solar radiation heat from entering the room and reduce the energy consumption of indoor air conditioning. According to different shading forms and shading coefficients, it can block 50% - 80% or even more solar heat, which can significantly improve the thermal comfort of the room in summer.
Lighting adjustment
Built-in sunshade blinds or adjustable external sunshades can adjust the incident angle of sunlight and the amount of light entering the room as needed. For example, soft light can be allowed to enter the room in the morning or evening, while the sunlight is completely blocked when the sun is strong at noon, realizing flexible lighting control.
Privacy protection
When the built-in sunshade blinds are adjusted to the appropriate angle, the privacy of the room can be protected without affecting the lighting, which is especially practical for some low-rise buildings or rooms close to the street.
3. Applicable scenarios
Residential
Suitable for installation in bedrooms, living rooms and other rooms, which can not only meet the lighting and ventilation needs, but also effectively control sunlight and heat, and improve the comfort of living.
Commercial buildings
In offices, shopping malls and other places, aluminum alloy sunshade windows help reduce air conditioning energy consumption, and can flexibly adjust the lighting and shading effects according to different usage needs.
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