Properties and heat treatment of S420N steel plate

S420N steel plate is a European standard steel grade, and a small amount of alloy elements are added inside the steel plate, so it can also be called European standard low alloy high strength steel plate. S420N steel plate has the advantages of high strength and good machinability. In addition, due to the development of industry in recent years, the requirements for steel plate strength are increasing, and conventional steel plate has been difficult to meet the requirements, but the method of simply improving steel plate strength by increasing the thickness of steel plate is very undesirable, which is not in line with the sustainable development strategy, so S420N steel plate, a low-alloy high-strength steel plate, came into being.

Chemical composition of S420N steel plate:
The carbon content in S420N steel plate is less than or equal to 0.15;
The silicon content in S420N steel plate is less than or equal to 0.40;
The content of manganese in S420N steel plate is less than or equal to 1.60;
The content of phosphorus in S420N steel plate is less than or equal to 0.020;
The sulfur content in S420N steel plate is less than or equal to 0.015;

Mechanical properties of S420N steel plate:
S420N steel plate yield strength σs (MPa)：≥930；
Elongation of S420N steel plate δ5 (%)：≥12；
Reduction of area of S420N steel plate ψ (%)：≥45；
Impact energy of S420N steel plate Akv (J): ≥ 63;
Impact toughness value of S420N steel plate αkv(J/cm2)：≥78；
S420N steel plate hardness: ≤ 217HB;

S420N steel plate delivery status:
The requirements of S420N steel plate are not high. Simply, the hot-rolled heat treatment state can be used. If the requirements are high, the normalized heat treatment state can also be used for delivery. The specific oral statement of delivery status can only be used for reference, and the specific statement is subject to the material specification.