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Casting characteristics of plate steel

2021-04-02 05:02:29
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Generally, thick steel plates with a thickness of more than 4mm are called medium-thick plates, and the key applications are shipbuilding, mechanical systems, bridge construction, high-pressure vessels, gas transportation and other industrial production industries. This type of thick steel plate is in service with poor standards. It not only stipulates that the thick steel plate has excellent fracture toughness and electric welding weldability, but also has strict management on the corrosion resistance, anti-lamellar resistance and hydrogen-induced cracking characteristics of the thick steel plate. With the continuous development of the main uses of plate, the sales market has become more fierce, and the requirements for the characteristics of plate have become higher and higher.

Rolled billet is the basis for the production of medium and thick plates. The key requirements for the quality of medium and thick plates for continuous billet are: billet ductility and low sulfate content, strict control of internal cracks, shrinkage porosity and management of the management center The center is loose.

Steel plates have a wide range of uses, involving construction, hardware, equipment, engineering machinery, machine tools, ships, aerospace, automobiles, locomotives, electronics, computers, electrical appliances, lamps and other industries, and the price of medium plates and their uses are becoming an ever-expanding trend .

The plate is mainly used in engineering construction, machinery and equipment manufacturing, vessel manufacturing, shipbuilding, highway and bridge construction, etc. It can also be used to produce various utensils, furnace covers, furnace plates, highway bridges and vehicle static steel thick steel plates, high alloy steel thick steel plates, shipbuilding thick steel plates, heating furnace thick steel plates, working pressure vessel steel plates, and stainless steel patterns Plates, thick steel plates of car beams, some parts of large tractors and electric welding prefabricated components, etc.

60 to 70% of the medium and heavy plate products can be produced by the medium and heavy plate steckel rolling mill. Compared with the general medium and heavy plate extruder, the medium and heavy plate steckel mill has the following advantages: hot-rolled medium plate rolled billets can be immediately loaded into the furnace for cooling Rolling saves energy; because the unit weight of the billet is increased, the production rate can be improved by cutting into thick steel plates after cold rolling. The product involves a wide range, and it can produce medium and heavy plate products and produce products for supply in plates. Generally speaking, it is difficult to produce 4~5mm plate steel extruder, but the medium and heavy plate steckel rolling mill can produce 5mm products in batches. Therefore, when producing products of the same thin specifications, the products produced by the medium and thick plate steckel rolling mill are low-cost. Strong commodity competitiveness.

So, what are the testing requirements for steel plates? The main steel plate testing items are as follows:

1. Testing of grades, chemical composition, mechanical properties, physical properties and chemical properties. The main elements for chemical composition analysis are carbon C, manganese Mn, silicon Si, sulfur S, phosphorus P and other alloying elements;

2. Mechanical performance testing mainly involves yield point, tensile strength, elongation and fatigue tests; physical performance testing mainly involves density, melting point, thermal expansion, thermal conductivity, electrical conductivity and magnetism; chemical properties are mainly high temperature resistance, Testing for low temperature resistance, acid resistance, alkalinity and oxidation resistance. In summary, the multiple tests above can basically meet the requirements and standards of different steel plates of different materials for different purposes.

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