ENGINEERING CASES

PRACTICAL APPLICATIONS OF VARIOUS STEEL PRODUCTS

Case One

Chemical plants demand high - performance steel due to harsh production conditions. Carbon structural steel, like Q235 and Q345, is cost - effective and used for common or medium - load structures. High - quality carbon structural steel, such as steel 20 for low - temp, low - pressure pipelines and steel 45 for high - strength parts after treatment. Low - alloy steel like Q345R for pressure vessels and 15CrMoR for high - temp, high - pressure with anti - hydrogen corrosion. Stainless steel, with different grades for various corrosion levels. Heat - resistant steel for oxidation and strength at high temps. Corrosion - resistant steel for specific media like sulfuric acid or seawater.

Case Two

Overview Construction projects use various steels. Carbon structural steel, like Q235, offers moderate strength and cost - effectiveness for general structures. High - quality carbon structural steel, after heat treatment, is suitable for high - strength parts. Low - alloy high - strength steel such as Q345 has high strength and good overall properties, applied in large and tall buildings. Steel for reinforced concrete includes plain, ribbed, and heat - treated bars for different structural needs. Prestressed steel strands are for large prestressed structures. Steel plates and sections form the main body of steel structures, each with unique features to meet diverse construction requirements.

Case Three

Steel for steel structures comes in various types. Carbon structural steel like Q235, with good all - around properties and low cost, is used in general buildings; Q275, stronger, suits heavy - load parts. Low - alloy high - strength structural steel such as Q345, known for high strength, corrosion resistance, and toughness, is popular in large projects; Q390 and Q420, even stronger, are applied in super - high - rise and long - span structures. High - quality carbon structural steel, after treatment, is used for high - strength parts and elastic components. Weathering steel, with added alloys, resists atmospheric corrosion for outdoor structures. Stainless steel, containing chromium, has strong corrosion resistance for corrosion - prone and decorative steel structures.

Case Four

Automotive steels are diverse. High - strength steels like DP steel, with high strength and toughness, are for safety - critical parts. TRIP steel combines high strength and good formability for complex - shaped components. MS steel, very strong but with low toughness, is for parts under huge loads. Ultra - high - strength PHS steel, with extremely high strength and weight - reducing effect, is used in key safety structures, while QP steel balances strength and toughness. Advanced high - strength steels, with multiple advantages, are used across key vehicle parts. Traditional low - carbon steel, for non - high - stress parts, has good formability and low cost; medium - carbon steel, after treatment, is for engine and transmission parts. Special - purpose stainless steel is for exhaust and decorative parts, and electrical steel is for motor and transformer cores.