Steel is the main raw material for shipbuilding and marine engineering structure construction, accounting for 20% ~ 30% of the construction cost of hull and marine engineering. The steel normal strength hull structural steel GL-B products involved mainly include steel plates and section steel (marine bulb flat steel, H-beam, angle steel, etc.), casting and forging steel and supporting welding materials, etc. Among them, the amount of steel consumed for hull construction accounts for about 60% of the total ship mass, and sheet metal accounts for about 88%.
Affected by the increase in coal trucks, the increase in sales, and the superimposed impact of accidents, sentiment has improved, and coal prices in Shanxi, Shaanxi, and Mongolia have seen an overall rise. In terms of ports in the Bohai Sea Rim, the Daqin line is connected to the eight ports, and the number of superimposed ports is not low, which promotes the general storage effect and the market is seriously out of stock of high-calorie and low-sulfur coal. In addition, due to the impact of rising futures and mining disasters, the market's bullish sentiment has increased, and the quotations of shipping companies generally rise.
Now many manufacturers will use CNC equipment to complete the steel plate cutting processing, this processing method is also gradually increasing, but if you want to make the processing effect meet the specifications and standards, the control requirements of operation technology are also relatively high. Now there are many kinds of steel plate cutting, during the actual processing, it is necessary to select the appropriate processing method according to the cutting requirements of steel plate, so as to achieve the ideal processing effect for normal strength hull structural steel GL-B.
The mechanical properties of normal strength hull structural steel GL-B steel plate are related to elastic or inelastic reaction or related to stress-strain relationship. Tensile strength, yield point, elongation and impact absorption energy are the main indexes to express the mechanical properties of hot rolled steel plate. Its value represents the ability of steel normal strength hull structural steel GL-B to resist various actions, which is the main criterion to evaluate the quality of steel material, and also the main basis for material selection and strength calculation in steel plate design.
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