https://www.friend-steelpipes.com/show-16-64-1.html1. Brand introduction
S355J2 is a low alloy high strength steel, S355J2 is the European standard: EN10025, can do Z-15, Z-25, Z-35 and I, II, III level of inspection requirements.
2. S355J2 Extension brand
S355J2 extension brand S355J2,S355J2-Z35,S355J2 +N-Z35,S355J2-Z35 is S355J2 based on the increase of steel plate thickness direction performance requirements, that is, Z-direction performance. S355J2+N-Z35 is a heat treatment process that increases Z-direction properties and normalizing rolling (or normalizing).
3. Chemical composition of S355J2
C: 0.15 0.18%, Si: 0.30 0.50%, Mn: 1.30 1.50%, P 0.015% or less, S 0.004% or less, Cr 0.30% or less, Ni 0.50% or less, Mo acuities were 0.10%, Cu 0.30% or less, 0.15% or less V, Nb 0.05% or less, Ti 0.05% or less The allowance is Fe and unavoidable impurities. Use thickness :125-150mm.
4. Analysis of mechanical properties of S355J2
Yield strength Rp0.2≥275MPa, tensile strength Rm:450 ~ 600MPa, elongation A≥18%,-20 impact work KV2≥47J, steel plate thickness direction tensile section shrinkage Z≥35%, the production of steel plate internal quality, high density and stable performance.
S355J2-Z35 Meaning :J2 requires -20 degree impact, Z35 is the Z-direction performance of steel plate.
The meaning of S355J2+N-Z35 :J2 requires -20 degrees of impact, N means that it is equivalent to normalizing rolling and not that it must be normalized, but a method of naming the steel number in the standard,Z35 is the Z-direction performance of the steel plate.
S355k2+N meaning :K2 requires negative 20 degree impact,J2 requires negative 20 degree impact,N means equivalent to normalizing rolling rather than must normalize.
5. Production process of S355J2 steel plate
Steel plate production methods include steelmaking, heating, rolling and normalizing processes; The steel rolling process adopts the shape control rolling process. Rolling process, ingot rolling temperature 1000 ~ 1050; The first stage adopts low speed and high pressure rolling process, the high temperature stage is 950 ~ 1000, the rolling speed is 1.6 ~ 2.0m/s, the single pass reduction rate is 15 ~ 20%, the cumulative reduction rate is 40 ~ 45%, to ensure sufficient deformation of the ingot. The opening temperature of the first stage is 910 ~ 930, the final rolling temperature is less than 870. 1, the steelmaking process, the use of electric furnace +LF furnace combined smelting process,VD vacuum treatment process to ensure that the vacuum degree ≤66Pa, vacuum holding time of 20 ~ 25min, after breaking into steel ingot. 2, heating process, ingot heating in soaking furnace, the maximum heating temperature 1270, soaking section temperature 1250 ~ 1260, to ensure uniform heating inside and outside the ingot. 3, normalizing process, the steel plate in the car furnace normalizing, steel plate normalizing temperature 880 ~ 910, holding time 1.8 ~ 2.2min/mm, that is, to get the required S355J2+N-Z35 steel plate.
6, S355J2 steel plate implementation standard
S355J2 steel plate product standard reference EN10025-2; Product performance test method standards refer to EN10025.
7, S355J2 steel plate specifications
Specification: Thickness :8-500mm, width :1600-4020mm, length :6000-18800mm.
8. Applicationof S355J2
S355J2 is a European standard structural steel, mainly used in large machinery manufacturing, equipment base, large welded steel structure, construction, bridge and other fields. With the continuous development of the economy and the large-scale needs of equipment, the demand for ultra-thick structural steel plates has gradually increased, and the technology of steel plates is becoming more and more strict, while the added value of steel plates is relatively high, especially the production of ultra-thick steel plates is relatively difficult. To achieve the production of ultra-thick steel plate, the use of ingot production in the rolling process of grain distribution, eliminate the pores in the steel plate, shrinkage and other defects, to meet the strength and impact toughness of the good match, thickness direction performance is better, suitable for mass production.
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