Decoding Steel: Unraveling the Distinctions Between S235J0 and DX51

Decoding Steel: Unraveling the Distinctions Between S235J0 and DX51 – Specification Analysis

1. Mechanical Composition:

S235J0:
– Yield Strength: minimum 235 N/mm²
– Tensile Strength: 360 to 510 N/mm²
– Elongation: minimum 23%
– Impact Energy: minimum 27 J at 0°C

DX51:
– Yield Strength: minimum 140 N/mm²
– Tensile Strength: 270 to 500 N/mm²
– Elongation: minimum 22%
– Impact Energy: minimum 22 J at -20°C

2. Chemical Composition:

S235J0:
– Carbon (C): maximum 0.17%
– Manganese (Mn): maximum 1.40%
– Phosphorus (P): maximum 0.035%
– Sulfur (S): maximum 0.035%
– Silicon (Si): maximum 0.35%
– Copper (Cu): maximum 0.30%
– Nitrogen (N): maximum 0.012%
– Chromium (Cr): maximum 0.30%
– Nickel (Ni): maximum 0.30%
– Vanadium (V): maximum 0.30%

DX51:
– Carbon (C): maximum 0.12%
– Manganese (Mn): maximum 2.00%
– Phosphorus (P): maximum 0.60%
– Sulfur (S): maximum 0.050%
– Silicon (Si): maximum 0.60%
– Aluminum (Al): maximum 0.02%
– Nitrogen (N): maximum 0.015%
– Titanium (Ti): maximum 0.15%

These specifications reveal the differences between S235J0 and DX51 steels. S235J0 has a higher yield and tensile strength compared to DX51. Additionally, S235J0 has a higher impact energy at 0°C compared to DX51, which has a lower impact energy at -20°C.

In terms of chemical composition, S235J0 has lower maximum values of carbon, manganese, phosphorus, sulfur, silicon, copper, nitrogen, chromium, nickel, and vanadium compared to DX51. DX51, on the other hand, has higher maximum values of carbon, manganese, phosphorus, sulfur, silicon, aluminum, nitrogen, and titanium.

These distinctions in mechanical and chemical composition make each steel type suitable for different applications and industries. It is crucial to consider these differences when selecting the appropriate steel for specific projects.