What is the difference between the hot rolled coil grade S355J2 and S355J2H

S355J2H seamless steel pipe is a steel grade in BS EN 10210-1:2006 "Non-alloy and fine-grained structural steel hot-formed structural pipes (hollow materials) Part I: Delivery technical requirements", which is equivalent to Q345D, and requires -20 impact energy to reach more than 27J, which belongs to low-alloy high-strength steel with good plasticity and impact toughness.

S355J2H steel for nuclear power for specific purposes.

Steel is a general term for iron-carbon alloys with a carbon content and mass percentage between to. The chemical composition of steel can vary greatly, and steel that contains only carbon elements is called carbon steel (carbon steel) or ordinary steel; In actual production, steel often contains different alloying elements according to different uses, such as: manganese, nickel, vanadium and so on.

The application and research of steel has a long history, but until the invention of the Bayesr steelmaking method in the 19th century, the production of steel was a costly and inefficient work. Today, steel is one of the most used materials in the world due to its inexpensive, reliable properties, and is an indispensable ingredient in the construction, manufacturing and daily lives of people. It can be said that steel is the material basis of modern society.

The letter H represents hollow section steel Hollow sections are made of seamless or welded both.

The suffix is different, the use temperature is different, and the use in non-Arctic and Antarctic extreme areas does not affect.

S355J2H steel for nuclear power for specific purposes. Nothing else makes a difference.

The same performance is the same.

S355J2H seamless steel pipe is a steel grade in BS EN 10210-1:2006 "Non-alloy and fine-grained structural steel hot-formed structural pipes (hollow materials) Part I: Delivery technical requirements", which is equivalent to Q345D, and requires -20 impact energy to reach more than 27J, which belongs to low-alloy high-strength steel with good plasticity and impact toughness.

Quality grade: 1, EN10025-2 quality grade is divided into S355JR, S355J0, S355J2, S355K2.

2. EN10025-23 quality grade is divided into S355N S355NL.

It is specified in the European standard EN10025-2

The beginning of S is structural steel, and the following 355 refers to the minimum yield strength at room temperature is 355MPa, and the steel at the beginning of S is carbon steel, so you just need to find a domestic grade of carbon steel with a minimum yield strength of 355MPa at room temperature.

For example, S235 can be replaced by Q235. As far as I know, there is a steel made of Q355 in China, and Q in China is the handwritten letter of the yield strength of the Qu Pinyin. So Q355 should be a substitute for S355, but the alloy composition may be slightly different.

S355J2C is the European label grade Yield 355 -20° impact. There are similarities with the domestic Q345D. Caution should be exercised if the belt is replaced. I heard from a friend that Henan Gangda ****** makes more external standard materials, you can ask them.

S355J2C is the European label grade Yield 355 -20° impact. There are similarities with the domestic Q345D.

Armor plate; : Steel plate is a flat steel made by pouring molten steel, cooling and pressing. Steel plates are divided according to thickness, thin steel plates < 4 mm (the thinnest mm), thick steel plates 4 60 mm, and extra-thick steel plates 60 115 mm.

Steel plates are divided into hot-rolled and cold-rolled according to rolling. The width of the sheet is 500 1500 mm; The width of the thickness is 600 3000 mm. Thin plates are divided into ordinary steel, high-quality steel, alloy steel, spring steel, stainless steel, tool steel, heat-resistant steel, bearing steel, silicon steel and industrial pure iron sheet. According to professional use, there are plates for oil drums, enamel plates, bulletproof plates, etc.; According to the surface coating, there are galvanized sheets, tinned sheets, lead-plated sheets, plastic composite steel plates, etc.

From the perspective of performance, S355K2+N S355J2+N is equivalent to the Q345E D of the national standard, but S355 requires the upper yield strength, which is different from the national standard.

Among them, K2 requires an impact of minus 40 degrees, and J2 requires an impact of minus 20 degrees.

n means normalized rolling, which can be simply understood as: the final rolling temperature is 900 degrees, and then air cooling (simulating the cooling process of normalizing heat treatment), and the performance is similar to that of normalizing heat treatment.

Due to the lack of controlled rolling and cooling, the strength is lower than that of Q345D E under the same composition, and the chemical composition required for S355K2+N S355J2+N is more than that of Q345D E.

S355K2+N is a European standard low-alloy high-strength steel plate, the impact energy under K2 -40, +N means normalized rolling, normalized rolling can be simply understood as: the final rolling temperature is 900 degrees, and then air cooling (simulating the cooling process of normalizing heat treatment), and the performance is similar to that of normalizing heat treatment.

S355K2+N implements the European standard EN10025

Wuyang Iron and Steel Sun Fan.

S355 and domestic corresponding trademarks:

The S355JR is equivalent to the domestic Q355B

The S355J0 is equivalent to the domestic Q355C

The S355J2 is equivalent to the domestic Q355D

The S355K2 is equivalent to the domestic Q355E