When selecting fastener materials, multiple key factors need to be comprehensively taken into account.
The first is mechanical performance requirements, including tensile strength, yield strength, hardness, toughness, etc., which determine the bearing capacity of the fastener under different load conditions.
The second is environmental adaptability, including corrosion resistance, high-temperature resistance, low-temperature resistance, etc., which determine the service life of the fastener in specific environments.
The third is cost-effectiveness, which requires considering the overall economic benefits such as material cost, processing cost, maintenance cost, etc., while meeting the performance requirements.
In addition, factors such as processing performance of the material, surface treatment requirements, standardization degree, and supply chain stability need to be considered. Especially in the current context of global supply chain restructuring, the availability and cost stability of the materials have also become important decision-making factors.
Understanding Fastener Materials
Here is the comparison of different matericals for fasteners:
| Material Type | Core Grade | Tensile Strength | Characteristics | Application Scenarios | |
|---|---|---|---|---|---|
| Carbon Steel | Grade 4.8 (mild steel) | Tensile strength ≥400MPa, yield strength ≥320MPa | High cost-performance, excellent processability, basic strength | Furniture, home appliances, light mechanical fixation, no heavy load/vibration scenarios | |
| Carbon Steel | Grade 8.8 (medium carbon steel quenched and tempered) | Tensile strength ≥800MPa, yield strength ≥640MPa | Medium strength, general wear resistance, rust-proof treatment required | Mechanical equipment, light auto chassis components, building load-bearing connectors | |
| Carbon Steel | Grade 10.9 (medium-high carbon steel quenched and tempered) | Tensile strength ≥1000MPa, yield strength ≥900MPa | High strength, impact resistance, good hardenability | Heavy-duty machinery, auto drive shafts, engineering brackets, high-load fixtures | |
| Carbon Steel | Grade 12.9 (high carbon steel quenched and tempered) | Tensile strength ≥1200MPa, yield strength ≥1080MPa | Highest strength grade of carbon steel, high hardness, excellent wear resistance | Ultra-heavy-duty equipment, core components of precision machinery, connectors for high-pressure working conditions | |
| Stainless Steel | 304 (0Cr18Ni9) | Tensile strength ≥520MPa, yield strength ≥205MPa | Excellent corrosion resistance, strong rust-proof ability, medium strength | Humid environments, food machinery, home appliance casings, light outdoor fixtures | |
| Stainless Steel | 316 (0Cr17Ni12Mo2) | Tensile strength ≥520MPa, yield strength ≥205MPa | Better corrosion resistance than 304, acid-alkali/salt spray resistance, containing molybdenum | Marine environments, chemical equipment, medical instruments, high-corrosion scenarios | |
| Stainless Steel | 316L (00Cr17Ni14Mo2) | Tensile strength ≥485MPa, yield strength ≥170MPa | Low-carbon 316, intergranular corrosion resistance, better toughness | Precision chemical equipment, high-temperature and high-corrosion working conditions, high-end sanitary ware | |
| Alloy Structural Steel | 40Cr (chromium steel) | Corresponding to Grade 8.8-10.9, tensile strength 800-1000MPa | Good hardenability, high strength, wear resistance, general corrosion resistance | Fasteners for mechanical shafts, heavy-duty gear connectors, engineering machinery components | |
| Alloy Structural Steel | 35CrMo (chromium-molybdenum steel) | Corresponding to Grade 10.9-12.9, tensile strength ≥1000MPa | Excellent high-temperature strength, fatigue resistance, strong toughness | High-temperature equipment, heavy machinery, auto engine components, high-pressure pipeline connectors | |
| Aluminum Alloy | 6061 | Tensile strength ≥205MPa, yield strength ≥110MPa | Lightweight, good corrosion resistance, medium strength | Light aerospace components, electronic equipment, lightweight brackets, outdoor rust-proof lightweight fixtures | |
| Aluminum Alloy | 7075 | Tensile strength ≥572MPa, yield strength ≥503MPa | High-strength grade of aluminum alloy, high hardness, lightweight | Heavy-duty aerospace components, high-end sports equipment, high-precision lightweight connectors | |
The performance of fasteners directly affects the reliability, safety and service life of the entire equipment or structure. Especially in critical application fields such as aero engines, nuclear power plant pressure vessels, high-speed railways, etc., the failure of fasteners may lead to disastrous consequences. Therefore, the correct selection and use of appropriate fastener materials are of vital significance for ensuring the quality and safety of the project.
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