Basic knowledge of SS400 steel

Posted:2021-10-30 10:25:14

1. SS400 is a marking method for Japanese steel, which is equal to the Chinese Q235 steel. Q represents the yield of this material, and the latter 235 refers to the yield value of this material, which is around 235. And as the thickness of the material increases, its yield value decreases. Due to the moderate carbon content, the overall performance is better, the strength, plasticity and welding properties are better matched, and the use is the most extensive.

2. SS400 steel is a representation of Japanese steel material, and it is a judgment standard, which is equivalent to domestic Q235 steel (also known as A3 steel). Foreign standard structural steels are often classified according to their tensile strength, such as SS400 (as marked in Japan), where 400 means that the minimum value of σb is 400MPa.

3. SS400 steel chemical composition:

C	Si	Mn	S	P
≤0.17	≤0.50	≤1.40	0.035	≤0.035

4. Mechanical properties of SS400 steel:

Tensile strength (σb/MPa)	SS400 yield point (σs/MPa)	SS400elongation after breaking (δ5/%)	SS400impact energy Akv -20℃	SS400sample size
340-470	235	24	≥27J	The sample blank size is 18mm

5. SS400 steel is often rolled into wire rod or round steel, square steel, flat steel, angle steel, I-beam, channel steel, window frame steel, etc., and medium-thick steel plate. It is widely used in construction and engineering structures. It is used to make steel bars or to build factory buildings, high-voltage power transmission towers, bridges, vehicles, boilers, containers, ships, etc., and it is also used as a large number of mechanical parts with low performance requirements.

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