What is the effect of surface treatment on performance of SPA-C material

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What is the effect of surface treatment on performance of SPA-C material

Phosphorus element (P element) is brought into steel by ore. Generally speaking, phosphorus is also harmful element. Although phosphorus can increase the strength and hardness of SPA-C material etc. steel, it also causes the decrease of plasticity and impact toughness. Especially at low temperature, it makes steel significantly brittle, which is called "cold brittleness". The higher the phosphorus content is, the greater the cold brittleness is. Therefore, the phosphorus content in SPA-C material etc. steel is strictly controlled.

"As Covid 19 spreads around the world, all unnecessary businesses and factories have been closed in Italy this week. South Korea's POSCO, the world's fifth-largest steelmaker, announced on March 24th that it would close its SPA-C material wire-processing centre near the northern Italian city of Verona from Thursday March 26th until April 3rd. POSCO has already closed two wire-processing centres in Delhi and Pune. Two wire processing centers in Malaysia and Thailand also announced last week that they will be closed until March 31."

Q265GNH coil chemical composition: C: 0.17~0.24, Si: 0.17~0.37, Mn: 0.40~0.70, S: ≤0.035, P: ≤0.035, Cr: 0.80~1.10, Ni: 0.030, Cu: ≤0.030, Mo: 0.15 ~0.25 SPA-C material mechanical properties: Tensile strength σb (MPa): ≥885(90) Yield strength σs (MPa): ≥685(70) Elongation δ5 (%): ≥12 Reduction of area ψ (%): ≥50 Impact energy Akv (J): ≥78

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