The mechanical performance test of 20Cr alloy steel usually includes the following aspects:
1. Tensile test: under standard test conditions, measure the stress-strain curve of the material during stretching to evaluate its tensile strength, yield strength, elongation, etc.
2. Impact test: Impact test is carried out on 20Cr alloy steel at low temperature to evaluate its toughness and impact resistance.
3. Hardness test: Measure the hardness of the 20Cr alloy steel surface by applying a certain pressure on the surface, so as to evaluate its wear resistance and scratch resistance.
4. Fatigue test: The 20Cr alloy steel is repeatedly loaded and unloaded to evaluate its durability and fatigue life.
To evaluate the mechanical properties of 20Cr alloy steel, it is necessary to comprehensively consider the above test results and analyze them in combination with the actual use environment and requirements.
The evaluation of mechanical properties of 20Cr alloy steel includes the following:
1. Strength: the ability of a material to resist deformation or damage under external force. Common strength indicators are yield strength, tensile strength and hardness.
2. Toughness: that is, the ability of 20Cr alloy steel to absorb energy without damage when subjected to external forces such as impact or vibration. Common toughness indicators include impact toughness and fracture elongation.
3. Machinability: the plasticity, forgeability and machinability of 20Cr alloy steel during processing.
4. Fatigue performance: that is, the deformation and destruction characteristics of 20Cr alloy steel after long-term repeated stress loading. Common fatigue performance indicators include fatigue limit and fatigue life.
5. Corrosion resistance: the stability and corrosion resistance of 20Cr alloy steel in chemical media. Common corrosion resistance indicators include oxidation resistance, acid and alkali resistance, and seawater corrosion resistance.
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