steel hsla - coil slitting

high-strength low-alloy (hsla)

High-Strength Low-Alloy (HSLA) steels, or microalloyed steels, are designed to provide better mechanical properties and and/or greater resistance to atmospheric corrosion than conventional carbon steels in the normal sense because they are designed to meet specific mechanical properties rather than a chemical composition.

The HSLA steels have low carbon contents (0.05-0.25% carbon) in order to produce adequate formability and weldability, and they have manganese contents up to 2.0%. Small quantities of chromium, nickel, molybdenum, copper, nitrogen, vanadium, niobium, titanium and zirconium are used in various combinations.

Composition ranges and limits for SAE HSLA Steels

SAE Designation (b)	Heat Composition Limits C max                       mn max                       p max
942X 945A 945C 945X 950A 950B 950C 950D 950X 955X 960X 965X 970X 980X	0.21 0.15 0.23 0.22 0.15 0.22 0.25 0.15 0.23 0.25 0.26 0.26 0.26 0.26 1.35 1.00 1.40 1.35 1.30 1.30 1.60 1.00 1.35 1.35 1.45 1.45 1.65 1.65 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.15 0.04 0.04 0.04 0.04 0.04 0.04

* (a) Maximum contents of sulfur and silicon for all grades: 0.050% S. 0.90% Si.
* (b) Second and third digits of designation indicate minimum yield strength in ksi. Suffix “X” indicates that the steel contains niobium, vanadium, nitrogen or other alloying elements. A second suffix “K” indicates that the steel is produced fully killed using fine grain practice; otherwise, the steel is produced semi-killed.
* Some key points provided by www.key-to-steel.com.