S355J2 steel plate yield strength Rp0.2≥265mpa, tensile strength RM: 450-680mpa, elongation a≥12%, impact energy Kv2≥27J, tensile area shrinkage Z≥35% in thickness direction.A572 grade 65 high strength steel, S355J2 steel plate has good internal quality, high density and stable performance.Meaning of S355J2-Z35: J2 requires negative 20 degree impact, and Z35 is the Z-direction performance of S355J2 steel plate.The meaning of S355J2 + N-Z35: J2 requires negative 20 degree impact, N means normalizing rolling rather than normalizing. Z35 is the Z-direction performance of S355J2 steel plate, A572 grade 65 high strength steel.
The production method of seamless steel pipe can be roughly divided into cross rolling method (menesmann method) and extrusion method. The cross rolling method (menesmann method) is to pierce the tube blank with the cross roll first, and then extend it with the rolling mill. This method is fast in production, but requires high machinability of tube blank. It is mainly suitable for producing carbon steel and low alloy steel tube, A572 grade 65 high strength steel tube.
Seamless steel pipe refers to the steel pipe made of a whole piece of metal without joints on the surface. According to the production method, it can be divided into hot rolling tube, cold rolling tube, cold drawing tube, A572 grade 65 high strength steel, extrusion tube and spinning tube. According to the shape of the section, it can be divided into two types: circular and irregular. The seamless tube has a maximum diameter of 650 mm (expanding tube) and a minimum diameter of 0.3 mm (capillary tube), which can be divided into thick walled tube and thin walled tube according to the thickness.
In February, the North American steel price index was 171.2 points, up 4.6 points on a month on month basis, up 2.8%; the U.S. manufacturing PMI was 50.1%, down 0.8 percentage points on a month on month basis. Among them, the production index decreased by 4.0 percentage points, and the inventory index decreased by 2.3 percentage points; at the end of February, the utilization rate of crude steel production capacity in the United States was 82.5%, 0.2 percentage points higher than that in the previous month. This month, the ex factory prices of major steel products such as A572 grade 65 high strength steel in the Midwest steel works of the United States rebounded. Except for the steel prices remained stable, the prices of other steel products rose.
