LR Grade A (LR GrA) Marine steel plate is a kind of high strength, high corrosion resistance steel, its chemical composition mainly includes iron (Fe), carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S) and other elements. According to the different requirements of use, the content of these elements needs to be precisely controlled. For example, carbon content will affect the strength and hardness of steel, silicon and manganese can improve the strength and toughness of steel, phosphorus and sulfur will reduce the plasticity and toughness of steel.

2. Mechanical Properties 

LR Grade A (LR GrA) Marine steel plate has excellent mechanical properties, and its tensile strength, yield strength, elongation and impact toughness are high. Its tensile strength is generally above 500MPa, the yield strength is about 300MPa, the elongation is above 20%, and the impact toughness is above 80J. These excellent mechanical properties enable the steel plate to withstand the complex stress of the ship at sea, and ensure the structural safety of the ship.

3. Heat Treatment State 

LR Grade A (LR GrA) Marine steel plates are usually supplied in a quenched and tempered state. Through quenching treatment, the strength and hardness of the steel plate can be improved, and tempering treatment can further enhance the toughness and plasticity of the steel plate. In addition, according to needs, other heat treatment can also be carried out, such as surface treatment, shot peening, etc., to improve the surface quality and mechanical properties of the steel plate.

4. Low Temperature Impact Test 

Due to the low temperature environment that ships may encounter during sailing, it is necessary to carry out low temperature impact tests on LR Grade A (LR GrA) ship steel plates. The test mainly detects the impact toughness of the steel plate at low temperature to ensure that the steel plate can maintain sufficient strength and toughness in the low temperature environment to prevent safety accidents such as brittle fracture.

5. Main Application Scenarios 

LR Grade A (LR GrA) Marine steel plates are mainly used in the manufacture of ship structural parts, such as hull, deck, cabin, etc. Due to its excellent corrosion resistance and mechanical properties, the steel plate can meet the long-term use requirements of the ship in the Marine environment and ensure the structural safety and service life of the ship. In addition, LR Grade A (LR GrA) Marine steel plates can also be used to manufacture offshore engineering structures such as offshore oil platforms and offshore wind power facilities.

6. TJC-Related Supply Cases 

As A well-known steel supplier, TJC supplies high quality LR Grade A (LR GrA) Marine steel plates to numerous companies and projects worldwide. For example, TJC supplied LR Grade A (LR GrA) ship steel plates to a large ship builder for the hull and deck of a large oil tanker. In this case, TJC ensured product quality and delivery time, and provided perfect technical support and after-sales service. The company spoke highly of TJC's products and services and established a long-term cooperative relationship.