s235jr, S235JRG1, S235JRG2 are European standard non-alloy structural steels, corresponding to domestic standards q235b, Q235A, Q235C respectively. The differences between the three are as follows:
The subject is different
1. S235JR: European standard non-alloy structural steel, equivalent to national standard Q235B.
2. S235JRG1 indicates that the yield point of the steel bar is 235N/MM2, and A indicates the temperature of the weather resistance.
3. S235JRG2: ordinary carbon steel. The carbon content is 0.06-0.22%, with less than 0.25% being the most commonly used.
The characteristics are different
1. S235JR: Slight and local defects such as pitting, concave surfaces, scratches, etc., whose depth (or height) does not exceed half of the thickness tolerance of the steel plate, are allowed on the surface, but the minimum allowable thickness of the steel plate and steel strip should be guaranteed.
2. S235JRG1: Tensile strength (σb/MPa): 375-500. The quenching temperature is 950 ℃, the salt bath furnace is heated, and the 10% NaCl brine is cooled and quenched.
3. S235JRG2: It belongs to low carbon steel, and each metal grade represents the lowest yield point of the steel when the thickness is less than 16mm.
Different uses
1. S235JR is a carbon structural steel with low carbon content, which is used for welding, bolting and riveting structures.
2. S235JRG1: It can be used for various abrasive tool handles and other unimportant abrasive tool parts.
3. S235JRG2 is carbon structural steel used to make engineering structural parts. It is generally used in the state of supply, and the content of sulfur and phosphorus in steel is relatively high, which are allowed to reach 0.050% and 0.045% respectively. This type of steel accounts for a large proportion of the total production of steel.
