S355J2-Z35 Pressure Vessel Steel Plate Introduction

S355J2-Z35 Pressure Vessel Steel Plate Introduction

S355J2-Z35 is a European standard structural steel, which is mainly used in large-scale machinery manufacturing, equipment bases, large-scale welded steel structures, buildings, bridges and other fields. With the continuous development of the economy and the large-scale demand for equipment, the demand for ultra-thick structural steel plate is gradually increasing, and the technology of steel plate is becoming more and more stringent, and the added value of steel plate is relatively high, especially the production of ultra-thick steel plate is relatively difficult. To achieve the production of ultra-thick steel plate, the grain distribution is uniform in the production and rolling process of steel ingots, and the defects such as porosity and shrinkage porosity inside the steel plate are eliminated, so as to meet the good matching of strength and impact toughness, and the thickness direction performance is better, which is suitable for mass production.
Meaning of S355J2-Z35: J2 requires an impact of minus 20 degrees, and Z35 is the Z-direction performance of the steel plate. The meaning of N-Z35: J2 requires an impact of minus 20 degrees, N means equivalent to normalized rolling, which is just a method of naming the steel number in the standard, Z 35 is the Z performance of the steel plate. The meaning of S355k2N: K2 requires negative 40 degree impact, J2 requires negative 20 degree impact, and N stands for normalized rolling. The executive standard of S35J2-Z35, S355K2 N and S355J2 N is the European standard executive standard: EN10025. It can do Z-15, Z-25, Z-35 and class I, II, III flaw detection requirements
 

Chemical composition

Tabulation: Depu Steel Date: 2024-01-18

C	Si	Mn	P	S	Cr	Ni	Mo	Cu
0.15-0.18	0.30-0.50	1.30-1.50	0.015	≤0.004	≤0.30	≤0.5	≤0.10	≤0.30

Note:
(1): In order to improve the properties of steel, the number of other trace alloying elements other than the above table can be added; It comes from the Internet and is for reference only.
(2): The allowable deviation of the chemical composition of the finished steel plate shall be in accordance with the provisions of
GB/T222 S355J2 N-Z35 steel plate production method
the production method comprises steelmaking, heating, rolling and normalizing processes; Described steel rolling process, adopts type control rolling process. In the rolling process, the ingot rolling temperature is 1000~1050; The first stage adopts the low-speed high-pressure rolling process, the high-temperature stage is 950~1000, the rolling speed is 1.6~2.0m/s, the single-pass pressing rate is 15~20%, and the cumulative pressing rate is 40~45% to ensure sufficient deformation of the ingot. The first stage of rolling temperature is 910~930, and the final rolling temperature is ≤870.