STEEL PLATES MECHANICAL PROPERTIES AND MANUFACTURING PROCESS BASICS AND TUTORIALS

STEEL PLATES BASIC INFORMATION - MECHANICAL PROPERTIES AND MANUFACTURING
What Are Steel Plates? What Are The Mechanical Properties Of Steel Plates?


This article covers hot-rolled uncoated steel plates with a minimum thickness of 3 mm, supplied flat or precurved
in any shape as required. Steel for cold forming is not within the scope of this article.


Manufacturing process
Rimming steel shall not be allowed and the steel shall be at least semi-killed in the deoxidation process. The plates may be produced directly on reversing mill, by cutting from parent plates rolled on reversing mill or hot rolled wide strips.

The plate edges may be as rolled or sheared, flame cut or chamfered. The products may be supplied in as rolled, normalized or quenched and tempered condition, or with controlled rolling (normalized rolling or thermo-mechanical rolling).


Strength
The nominal yield strength shall be in the range of 235 N/mm2 to 690 N/mm2. The nominal tensile strength shall be in the range of 300 N/mm2 to 1000 N/mm2.

Ductility
The elongation after fracture on proportional gauge length shall be at least 15 %, for nominal yield strength not greater than 460 N/mm2; and shall be at least 10 % for nominal yield strength greater than 460 N/mm2. The tensile strength to yield strength ratio shall be at least 1.2 based on nominal values, or at least 1.1 based on actual values, for nominal yield strength not greater than 460 N/mm2.

NOTE Conversion of elongation values measured not based on proportional gauge length is necessary and shall be performed according to BS EN ISO 2566-1.

Impact toughness
As a minimum, the product shall be able to absorb at least 27 J of impact energy at 20 °C. NOTE Depending on other factors including the thickness and minimum service temperature, the impact toughness should also conform to the appropriate requirements as given in BS 5950-1.

Through thickness deformation properties
Where appropriate, through thickness deformation properties shall be specified to guarantee adequate deformation capacity perpendicular to the surface to provide ductility and toughness against lamellar tearing.


Chemical composition
In general, based on ladle analysis, carbon content shall not exceed 0.26 %; maximum CEV and content of impurities shall be in accordance with the requirements given in Table 1.

NOTE 1 Interpolation for maximum content shall be allowed for design strength not given in Table 1.
NOTE 2 Depending on the product thickness or variation in metallurgical process and intended use, the requirements for chemical composition might vary and shall be referred to BS EN 10025-1, BS EN 10025 2, BS EN 10025-3, BS EN 10025-4, BS EN 10025-5 and BS EN 10025-6.

Table 1 — Chemical composition requirements for steel plates based on ladle analysis

Dimensional and mass tolerances
Dimensions
In general, the deviation in actual thickness from nominal plate thickness shall not exceed the larger of ± 2 mm and ± 10 %.

Mass
In general, the deviation in actual mass from mass computed using a density of 7850 kg/m3 shall be limited by the dimensional tolerances.

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