Analysis of chemical composition of AH36/EH36 steel plate
Brand: AH36/EH36
Thickness: ≤50mm
AH36/EH36 steel plate carbon content C: ≤0.18
AH36/EH36 silicon content Si: ≤0.1-0.5
AH36/EH36 steel plate manganese content Mn: 0.9-1.60
Phosphorus content P of AH36/EH36 steel plate: ≤0.035
Sulfur content S of AH36/EH36 steel plate: ≤0.035
Chromium content of AH36/EH36 steel plate Cr: ≤0.2
Nickel content of AH36/EH36 steel plate Ni: ≤0.4
AH36/EH36 steel plate niobium content Nb: 0.02-0.05
AH36/EH36 steel plate aluminum content Alt: ≥0.015
Molybdenum content of AH36/EH36 steel plate: ≤0.08
AH36/EH36 vanadium content V: 0.05~0.1
AH36/EH36 steel plate titanium content Ti: ≤0.02
AH36/EH36 steel plate copper content Cu: ≤0.35
Mechanical properties of AH36/EH36 steel:
Brand: AH36
Yield strength: >355MPa;
Tensile strength: 490-630MPa;
Elongation after break: >=21;
Experimental temperature: 0℃;
Brand: EH36
Stretching test :
Upper yield strength (R Eh /MPa): ≥355
Tensile strength (Rm/MPa): 490-630
Elongation after break (A%): ≥21
V-shaped impact test:
Test temperature (℃): -40
Thickness (mm) ≤ 50 Impact absorption energy KV2/J
Portrait: 34, landscape: 24
Thickness (mm) 50-70 Impact absorption energy KV2/J
The length should not be less than 41 and the width should not be less than 27
Thickness (mm) 70-150 Impact absorption energy KV2/J
Portrait: 50, landscape: 34
PS: The specific mechanical properties should be stated in the steel mill's material book.
AH36/EH36 steel plate Z-direction performance
1. What is Z direction?
Z-direction steel: also known as "lamellar tearing resistant steel", which is what is usually called Z-direction performance. In steel structures connected by welding, when the thickness of the steel plate is not less than 40 mm and it bears tensile force along the thickness direction of the plate, in order to avoid lamellar tearing during welding, it is necessary to use steel that resists lamellar tearing (usually referred to as "Z"). "To Steel"). Thick plates have lamellar tearing problems, so Z-direction performance testing is required.
2. Z-direction performance and its impact on the steel plate itself
Steel plates and steel sections are rolled and formed. Generally, the steel used in multi-high-rise steel structures is hot-rolled. Hot rolling can destroy the casting structure of the steel ingot and refine the grains of the steel. The bubbles and cracks formed during the pouring of steel ingots can be welded under high temperature and pressure, thereby improving the mechanical properties of the steel. However, this improvement is mainly reflected in the rolling direction, because the non-metallic inclusions (mainly sulfides, oxides, silicates, etc.) inside the steel are pressed into thin sheets after rolling and still remain in the steel plate ( Generally parallel to the surface of the steel plate), causing the steel plate to appear delaminated (interlayered). This non-metallic interlayer phenomenon. Deteriorating the tensile properties of the steel along the thickness direction. Therefore, the mechanical properties of steel plates are different in three directions: the best along the rolling direction; the performance perpendicular to the rolling direction is slightly worse; and the performance along the thickness direction is second. Generally, thick steel plates are more prone to lamellar tearing, because the thicker the steel plate, the more non-metallic inclusion defects, and the thicker the weld, the greater the welding stress and deformation. To solve this problem, it is best to use Z-direction steel. This kind of steel plate is a specially smelted and treated steel based on a certain grade of structural steel (called parent steel). Its sulfur content is less than 1/5 of that of ordinary steel, and its cross-sectional shrinkage is more than 15%. . The mechanical properties (mainly ductility properties) of the steel plate along the thickness direction are called Z-direction properties. The Z-direction properties of steel plates can be obtained by conducting tensile tests on specimens, and are generally measured by the shrinkage of area. The Z-direction steel plates produced in my country are marked by adding Z-direction steel plate grade marks Z25, Z25, and Z25 after the parent steel number. The number after the Z is an indicator of the cross-sectional shrinkage rate (%).
