• Improper welding of X80 pipeline may cause cracks
• Brief introduction of API X52 pipeline steel
• The difference between PSL1 and PSL2
• Harm of inclusions in X70 pipeline steel
• API 5L pipeline pipe
• X52 steel plate surface quality standards that need to be met
• The basic production process of API 5L X60 pipeline steel
• The key to Q460D steel welding process
• What does the heat treatment of Q690 Steel include?
• Reasons for choosing Q690D steel

Hardenability of SS500 steel plate

SS500 steel plate is a good performance of cold-formed thin-wall steel, low alloy and high strength steel, suitable for the manufacture of pressure vessels and various mechanical parts. SS500 steel plate is a kind of cold formed thin-wall steel, which is based on ordinary carbon structural steel Q345A. The plasticity and welding properties of SS500 steel plate are improved by controlling hot working process parameters. It has the advantages of high strength, good toughness and weldability, good process performance and reasonable cost. It is widely used in building structure, bridge, pressure vessel and other fields in Europe, America and Japan. What are the characteristics of SS500 steel plate:

Hardenability of SS500 steel plate. Generally, quenched materials are required to have higher tensile strength and hardness, and lower ductility ratio, so hardenability is an important index to evaluate the hardenability of steel. The hardenability of steel is related to chemical composition and microstructure. During quenching and tempering, susaturated solid solution is easily formed on or within the austenite grain boundary. If there is not enough cold hardening, it will lead to uneven microstructure of the material, which is called quenching cracking phenomenon. Generally speaking, high carbon structural steel has better hardenability than low carbon structural steel, such as SS500, SS460, etc.

The hardenability of SS500 steel plate is related not only to the austenitic transition temperature but also to the volume fraction of the phase transition. For example, some steels require amplitude-modulated decomposition at higher temperatures to obtain the ideal tempered soxite structure. Higher martensitic transition temperature can precipitate carbides on the grain boundary during actual quenching, reduce the interface area of austenite and ferrite transition, reduce thermal stress and improve fatigue strength. Generally, it is better to control the carbon content below 0.02%.