Introduction:
Q235A is carbon structural steel, see QG/T700 for details. The old standard is called A3 steel (which was the previous common name).
Q235A low carbon structural steel. Hot-dip galvanizing is a surface anti-corrosion process. Put the steel plate into molten liquid zinc, take a bath, and then take it out. The surface of the steel plate will be covered with a thin layer of zinc. Since zinc is more active than steel, it is oxidized first in an oxidizing environment, thereby preserving the steel plate inside.
Q235A has good toughness and plasticity, a certain elongation, and good welding performance and hot workability. Q235A is generally used in the hot-rolled state. Its rolled steel sections, steel bars, steel plates, and steel pipes can be used to manufacture various welded structural parts, bridges, and some common machine parts, such as screws, bolts, tie rods, rivets, collars, and connectors. Rod etc.
Carbon C: 0.14~0.22 Silicon Si: ≤ 0.30 Manganese Mn: 0.30 ~ 0.65 Sulfur S: ≤ 0.050 Phosphorus P: ≤ 0.045 Chromium Cr: Allowable residual content ≤ 0.030 Nickel Ni: Allowable residual content ≤ 0.030 Copper Cu: Allowable residual content ≤ 0.030.
If you want to use any material, you must first have a systematic understanding of the material and understand its various properties and indicators, such as ductility, hardness, etc., so that you can better apply it. q235a is an extremely practical steel. It has very good metallic properties and can be used to make many useful things. Its name is also very particular. The first letter q represents the grade of the steel, the number immediately following represents the strength of the steel, and the last letter a means the level of sulfur content. Almost all steels are So named.
Analysis of mechanical properties of Q235A:
Tensile strength (Mpa): 370~500
Yield strength (Mpa): when ≤16: ≥235; when >16~40: ≥225; >40~15; when >100~150: ≥195; when >150: ≥185
Elongation (%): ≤40: ≥26; >40~60: ≥25; > 60~100: ≥24 > 100~150: ≥22; > 150~200: ≥21
Cold bending (bending 180 degrees): longitudinal steel thickness s16, bending center diameter d=a: when steel thickness > 16~100, bending center diameter d=2a
When the transverse steel thickness is ≤16, the bending center diameter d=1.5a; when the steel thickness is > 16~100, the bending center diameter d=2.5a;
