20CrMnSi alloy structural steel

20CrMnSi Alloy Structural Steel

20CrMnSi alloy structural steel is a widely used high-quality low-cost alloy steel, which has high strength and hardenability, good toughness and plasticity, moderate cold deformation and good welding performance. It has high fatigue limit and multiple impacts. The surface hardening has good machinability and good polishability, and the cutting part has good performance. It has high manufacturing accuracy and good mechanical properties.

20CrMnSi alloy structural steel is typically used to make spring, gear, sprocket and other parts. Its characteristics are high strength, high toughness and good wear resistance. It is suitable for automobile, locomotive, marine, weaponry, engineering machinery and other industries.

The chemical composition of 20CrMnSi alloy structural steel includes carbon, silicon, manganese, chromium, phosphorus, sulfur, molybdenum, nickel, aluminum and other elements. The content of certain elements should meet certain requirements. Carbon content 0.17-0.24, silicon content 0.17-0.25; Manganese content 0.30-0.60, chromium content 0.90-1.20; Phosphorus content ≤ 0.035, sulfur content ≤ 0.035; Molybdenum content ≤ 0.15, nickel content ≤ 0.10; Aluminum content ≤ 0.030.

20CrMnSi alloy structural steel is usually heated to 830-850 ℃ and tempered by oil-cooling. The hot-if required, water-hardening process can be used. The hardness of 20CrMnSi alloy structural steel can reach more than HRC20 when it is quenched and heated. Its tensile strength is 1150 MPa, yield strength 930 MPa and elongation is 6%. The metallographic structure of 20CrMnSi alloy structural steel is fine and uniform, and pearlite is the main structure.

20CrMnSi alloy structural steel can be welded with manual arc welding, argon shielded arc welding, submerged arc welding and CO2 gas shield welding. Preheating welding can be used to reduce thermal stress and prevent crack. Generally speaking, the welding temperature should not exceed 300 °C. Before welding, it should be checked for cleaning and eliminate welding defects such as misalignment, non-conformance, undercut and welding line transition.

In conclusion, 20CrMnSI alloy structural steel has many advantages, such as high strength, good plasticity, good toughness and good weldability. It is widely used in the manufacture of automobile, locomotive, marine, weaponry, engineering machinery and other industries.

20CrMnSi alloy structural steel is a commonly used medium and low speed wire, with the steel grade of 20CrMnSi, which is evenly quenched and tempered to slightly higher strength than 15CrMnSi steel, with good plasticity and certain toughness. Its forming and cutting performance, welding performance and machinability are generally better than 42CrMo alloy, and its hardness and abrasion resistance are better than 20Mn2 steel.

The chemical composition of 20CrMnSi Steel, hosted by the Ministry of Metallurgical Industry is C 0.18-0.23, Si 0.17-0.37, Mn 1.10-1.40, Cr 0.80-1.10, Mo <0.30, S<0.035, P<0.035.

The mechanical properties of 20CrMnSi Steel are: tensile strength: 600MPa, yield strength: 520Mpa, elongation after break: 18%, section reduction degree: 36% (cold impact test).

20CrMnSi Alloy Structural Steel is used to make all kinds of machinery parts and components which are used in the mechanical industry and support the long-term working of the machines.

It is widely used in the manufacture of shafts, gears, rods, sprockets, bolts, screws and nuts. It is especially suitable for parts that require better hardenability and higher strength, wear-resistant and fatigue-resistant parts, such as bearing parts, gears, bolts and other mechanical parts.

It can also be used in the manufacture of automobile, tractor, agricultural machine and transmission parts, in order to enhance the working performance of automobile and other products.