34CrNiMo6+QT is a low alloy steel that has high strength, toughness, and hardenability. It is used for large parts that need to withstand high stress, such as axles, tools, and fasteners. The ‘+QT’ means that the steel is quenched and tempered, which is a heat treatment process that improves its mechanical properties. (34crnimo6+qt chemical composition)
What are the Chemical Elements in 34CrNiMo6+QT Steel?
34CrNiMo6+QT steel contains the following chemical elements:
- Carbon ©: 0.30 to 0.38%
- Chromium (Cr): 1.30 to 1.70%
- Manganese (Mn): 0.50 to 0.80%
- Molybdenum (Mo): 0.15 to 0.30%
- Nickel (Ni): 1.30 to 1.70%
- Silicon (Si): up to 0.40%
- Phosphorus (P): up to 0.025%
- Sulfur (S): up to 0.035%
These elements give the steel its alloying characteristics, such as corrosion resistance, hardenability, and toughness.
How to Improve the Corrosion Resistance of 34CrNiMo6+QT Steel?
34CrNiMo6+QT steel is not very resistant to corrosion, because it has a low chromium content. Chromium is the element that forms a protective oxide layer on the steel surface, which prevents further reactions with the environment. To improve the corrosion resistance of 34CrNiMo6+QT steel, there are two main methods:
- Applying a protective coating, such as zinc, nickel, or paint, on the steel surface. This creates a physical barrier that isolates the steel from the environment.
- Modifying the chemical composition or microstructure of the steel. This can be done by adding more alloying elements, such as chromium, nickel, or copper, or by changing the heat treatment or mechanical processing of the steel. This can enhance the formation of the passive layer, increase the resistance to pitting and crevice corrosion, or improve the galvanic compatibility with other metals. (34crnimo6+qt chemical composition)
