Introduction
Tool steel is one of the most important components used in metalworking and mechanical manufacturing. It is a special steel alloy composed of many elements and used in a wide range of industrial applications. It has strong wear resistance, high strength and good toughness, as well as good thermal conductivity, which makes it an ideal choice for cutting and forming on a variety of metal components. The traditional steel products are usually high content of carbon and require heat treatment to become hard and wear-resistant. On the contrary, Electrical Arc Furnace (EAF) alloy tool steels are low in carbon and can be heat treated to obtain a variety of properties that make the steel durable and suitable for industrial applications.
YB/T155-1999 Electrical Arc Furnace Alloy Tool Steels Module is an important standard for the industry that defines the requirements for quality and performance of electrical arc furnace alloy tool steels. This standard establishes the requirements of chemical composition, mechanical properties, tolerance requirements, test methods and inspection rules for tool steel products obtained by smelting with electrical arc furnace. The standard also sets out the requirements for qualification and inspection of steel batches.
Chemical Composition
YB/T155-1999 Electrical Arc Furnace Alloy Tool Steels Module specifies the requirements for chemical composition and tensile properties, which shall meet the specified requirements.
The chemical composition of the mold steel must meet the requirements of the standard. It is safe to adopt the steel according to the standard. The minimum content of chromium and vanadium must meet the requirements of the reference standard. The content of chromium, vanadium and other elements shall not be lower than the values specified in the table.
The chemical composition of standard steel products should meet the following requirements:
Carbon (C) ≤ 0.50%
Silicon (Si) ≤ 0.35%
Manganese (Mn) ≤ 0.90%
Chromium (Cr) ≥ 0.75%
Vanadium (V) ≥ 0.15%
Nickel (Ni) ≤ 0.50%
Molybdenum (Mo) ≤ 0.35%
Tungsten (W) ≤ 0.35%
Copper (Cu) ≤ 0.25%
Titanium (Ti) ≤ 0.050
Mechanical Properties
The mechanical properties of YB/T155-1999 Electrical Arc Furnace Alloy Tool Steels Module must meet the requirements of the standard. The mechanical properties were determined by the tensile test. The tensile strength of the steel, yield strength, elongation, impact energy and the maximum reduction of area must meet the requirements of the standard.
The following are the requirements for the mechanical properties of the steel:
Tensile Strength (σb) ≥ 1020MPa
Yield Strength (σs) ≥ 790MPa
Elongation (δ) ≥ 12%
Impact Energy （A）≥ 33J
Maximum Reduction of Area (Ψ) ≥ 45%
Conclusions
YB/T155-1999 Electrical Arc Furnace Alloy Tool Steels Module is an important standard for the industry that defines the requirements for quality and performance of electrical arc furnace alloy tool steels. This standard establishes the requirements of chemical composition, mechanical properties, tolerance requirements, test methods and inspection rules for tool steel products obtained by smelting with electrical arc furnace. The chemical composition and mechanical properties of the steel must meet the requirements of the standard. The standard also sets out the requirements for qualification and inspection of steel batches.
