DIN 2631 flange PN6 welding neck flange alloy steel

Recently, I have to introduce the Q235 material of flange, there are 20 # steel is qualitative, stainless steel, alloy steel material and so on.Today I'll give you introduce 20 round steel material.


20th round steel flange, flange also called # 20 is a kind of low carbon steel material of flange, 20 refers to the carbon content of 0.2%.General steel products are hierarchical: low carbon steel, medium carbon steel and high carbon steel.Carbon content less than 0.25%, belong to the low carbon steel, between 0.25 ~ 0.60% belongs to the medium carbon steel, carbon content is more than 0.60% is the high carbon steel.Carbon content less than 2.1% for steel, carbon content is higher than 2.1% for iron.And the impact of its toughness and the carbon content, carbon content in steel, the higher its toughness, the worse, the higher the carbon content in the iron its toughness is better.


The chemical composition of 20 steel  carbon C: 0.17 ~ 0.17 "manganese silicon Si: 0.17 ~ 0.37 Mn: 0.35 ~ 0.65 S S: 0.035 or less phosphorus P: 0.035 or less chromium Cr: 0.25 or less nickel and Ni: 0.25 or less copper Cu: 0.25 or less

Mechanical properties, tensile strength of sigma b (MPa) : 410 (42) or higher yield strength sigma s (MPa), 245 (25) or higher elongation delta (%) : 25 or higher percentage reduction of area bits (%) : 55 or higher hardness, heat treatment, or less 156 hb

Others can often ask Q235 material of the flange and replace # 20 flange.Q235 steel yield point is 235 mpa, the elongation for 21-26%;20 # steel in state of normalizing the yield point is 245 mpa, elongation is > 25%;Quenched and tempered condition the yield point is 280 mpa, elongation was > 22%.Strictly speaking, they are two kinds of material of flange can't replace, but the load is not big, the case of not high demand are interchangeable, be wary, however, can not replace the best.

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