High strength steels

The early steels developed were classified as copper-nickel-phosphorus and chromium-silicon-copper. These elements improved corrosion resistance. Other elements, such as molybdenum and manganese enhanced their strength with minimum loss in ductility and toughness.

These steels were manufactured to 12 maximum carbon and were originally furnished as hot rolled sheets and strip. They are welded very satisfactorily, even by spot and seam welding, and could be fabricated by bending and moderate drawing. Development of these steels enjoyed such success that demand soon arose for carbon steels to meet the same strength levels where corrosion resistance was not a prime factor. High-strength low-alloy and high strength carbon steels became available in plate and structures aswell as in sheets. Some hot rolled steels containing columbium or vanadium are available up to 65,000 psi yield strength. Further research and development have now produced weldable, quenched and tempered carbon steels with minimum yield strengths up to 80,000 psi and quenched and tempered low alloy steels with 100,000 psi minimum yield strength. These steels not only provide higher strength than the hot rolled steels, but improve toughness at low temperatures.

Round and rectangular tubular products as well as plates and bars are available at these strength levels.

Дата добавления: 2015-07-20