Determination of yield point and yield strength of SA573 Grade 70 heat treatment

S355J2+N steel plate belongs to the European standard low alloy structural steel grade. S355J2 steel is equivalent to Q345D grade. SA573 Grade 70 heat treatment, S355J2+N low alloy steel plate is widely used in bridges, vehicles, ships, building steel structures. Mechanical properties of S355J2+N steel: Yield strength: ≤16mm: ≥355; 16-40: ≥345; 40-63: ≥335; 63-80: ≥325;80-100: ≥315; 100-150: 295; 150-200: ≥285; 200-250: ≥275; 250-400: ≥265. Tensile strength: 450-680MPa.

The SA573 Grade 70 heat treatment plate products have passed the EU CE certification, and have been recognized by China, France, the United States, the United Kingdom, Germany, Italy, Japan, South Korea and other eight classification societies for high-strength ship plates. The steel strand products have passed the United States (PTI) certification. The SA573 Grade 70 heat treatment products enjoy a high reputation in the domestic and foreign markets. The products are applied to national key projects and sold to 37 countries and regions such as EU, Middle East, Southeast Asia and America.

A plasma cutter uses a stream of compressed gas (air, nitrogen, argon, etc.) and a consumable wire electrode as the two primary feedstocks of the steel cutting process. The electrode sends a high electrical charge through the gas, raising its temperature to the point of ionization to generate extremely hot plasma (~20,000°C). This plasma is directed through the cutting tip to create a highly focussed beam, with velocities approaching the speed of sound.

Rolled sheet is a very common material in industrial construction. Rolled sheet at room temperature is cold-rolled sheet, and cold-rolled sheet is the rolling of hot-rolled coils below the recrystallization temperature. The hot-rolled sheet is rolled above the recrystallization temperature. So what is the difference between SA573 Grade 70 heat treatment, hot rolled sheet and cold rolled sheet?

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