Q235 corresponds to the international brand should be SS41
Q235 steel strength is moderate, have good bearing capacity, good plasticity and toughness, solderability and processing, is the most commonly used steel. Make steel, steel and so on.
Q235 is a material of steel. Q represents the yield of this material, the back of the 235, refers to this material yield value, at about 235. And the yield value decreases with the increase of the thickness of the material.
q235a, q235b, q235c, q235d. This is the level of distinction, which represents the main impact of the temperature is different! A, B, C, D, and different, refers to the difference in the impact temperature of their performance. respectively:
Q235A level, is not to do the impact, q235b level, is 20 degrees of room temperature impact, q235c level, is 0 degree impact; q235d level, is-20 degree impact. At different impact temperatures, the impact value is also different. Element content: A, B, C, D sulfur content decreases in descending order, a and B phosphorus content is the same, C phosphorus content second, D phosphorus content is the least.
Q235 chemical constituents at all levels:
Q235 points A, B, C, D four (gb700-88)
q235a class contains C0.14~0.22% Mn0 30~0. si≤0 s≤0.045
Q235B grade contains C0.12~0. $number Mn0.30~0 $number. si≤0 s≤0.045
Q235C grade contains c≤0.18%c3f8 Mn0.35~0 $number. si≤0 s≤0.040
Q235D grade contains c≤0.17% Mn0 35~0. $number si≤0. s≤0 040.035
In terms of its Deoxidation method, F, B, Z can be used as boiling steel, flat calm steel, calm steel. The boiling steel is not completely deoxidation, and the plasticity and toughness are poor. The welded structure made of this material is easy to crack when the joint is subjected to dynamic load. It is not suitable to work at low temperature, sometimes it can produce sclerosis. In contrast, the calm steel is superior and uniform, and the plasticity and toughness are good.
Mechanical properties of Q235: Tensile strength (Σb/mpa): 375-500 elongation (δ5/%) ≧26 (a≦16mm), ≧25 (A>, 16-40mm) ≧24 (a> 40-60mm), ≧23 (A> 60-100mm) ≧22 (a) 100-150mm), ≧21 (A> 150mm) wherein A is a steel thickness or diameter. In the plate, is the most common material, generic plate series. The past is called: A3.
Implementation criteria: External standards: GB709, internal standards: gb3274-88, q235a and q235b distinction </STRONG> Q235 is the common carbon structural steel brand, its significance is: yield point is greater than 235MPa, the quality grade is divided into: A. B. C. D four, in turn.
q235a composition: c--0 14-0. mn--0 30-0. si--0 s--0. $number. 3, P--0, 045., q235b. c--0.: 12-0 mn--0.., 30-0. s--0.045 p--0.045, the content of each alloying element is a percentage. The essential difference between the two materials is not the obvious distinction between chemical elements or mechanical properties, but the difference in whether or not they are tested. If the q235a only to the chemical element inspection, but the mechanical performance does not carry on the examination, q235b to some mechanical performance inspection, q235c the entire mechanical performance to carry on the examination, including the impact test and so on.