Strength Changes

 

Yield Strength Changes: During low - temperature tempering at 200°C, the yield strength of the shipbuilding steel plate will change to a certain extent. As martensite begins to decompose to form tempered martensite, the internal microstructure of the material is slightly adjusted. Generally, the yield strength may decrease slightly. For example, for a shipbuilding steel plate with a yield strength of 700MPa in the original quenched state, after low - temperature tempering at 200°C, the yield strength may reduce to around 680 - 690MPa. This is because during the decomposition of martensite, the resistance to dislocation movement is somewhat reduced, causing the material to begin plastic deformation under a lower stress.

 

Tensile Strength Changes: The tensile strength will also show a similar changing trend. As the tempering process proceeds, the stress concentration in the material is alleviated to a certain extent, and the high - hardness martensite structure formed by the original quenching gradually changes. The tensile strength may decrease from a relatively high value after quenching (such as 800MPa) to around 780 - 790MPa. However, the decrease in this strength is relatively small, and the shipbuilding steel plate can still maintain a relatively high load - bearing capacity. This is because in the low - temperature tempering stage, the precipitation of carbides produces a certain dispersion - strengthening effect, which buffers the decrease in strength.

 

 

 

 

 

 

 

 

 

 

 

 

 

Category	Standard	Grade
Carbon Steel	GB/T 3274-2007, or as customers' required	Q235A/B/C/D,Q275A/B/C/D
Low Alloy Steel	GB/T 3274-2007, or as customers' required	Q345.Q390,Q420,Q460A/B/C/D/E
Abrasion Resistant (AR)	GB/T 24186-2009	NM360,NM400,NM450,NM500

 

 

Toughness Changes

 

Impact Toughness Improvement: During the low - temperature tempering process at 200°C, the toughness of the shipbuilding steel plate will be improved. The shipbuilding steel plate after quenching has relatively low toughness due to the existence of structural stress and thermal stress. During low - temperature tempering, the decomposition of martensite releases the internal stress of the material, and the microstructure becomes relatively stable. For example, through impact tests, it can be found that for a shipbuilding steel plate with an impact toughness of 30J/cm² in the original quenched state, after low - temperature tempering at 200°C, the impact toughness may increase to around 35 - 40J/cm². This improvement in toughness enables the shipbuilding steel plate to better absorb energy when impacted and reduces the risk of brittle fracture.

 

Fracture Toughness Changes: The fracture toughness will also increase with low - temperature tempering. During the tempering process, the change in the microstructure of the material increases the resistance to crack propagation. From a microscopic perspective, the formation of tempered martensite and the dispersed distribution of carbides can prevent the rapid expansion of cracks. This means that when the ship structure is subjected to external forces and tiny cracks are generated, the shipbuilding steel plate tempered at 200°C can better resist the further extension of the cracks, thereby improving the safety of the ship structure.

 

 

 

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