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Metals > Steel > HSLA

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 0.21 1.35 0.04
945A 0.15 1 0.04
945C 0.23 1.4 0.04
945X 0.22 1.35 0.04
950A 0.15 1.3 0.04
950B 0.22 1.3 0.04
950C 0.25 1.6 0.04
950D 0.15 1 0.15
950X 0.23 1.35 0.04
955X 0.25 1.35 0.04
960X 0.26 1.45 0.04
965X 0.26 1.45 0.04
970X 0.26 1.65 0.04
980X 0.26 1.65 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.
Slitting Capabilities
Gauge Range
.004" to .190" (.102 mm to 4.826 mm)
Width Range
.250" to 60" (6.365 mm to 1524 mm)
ID
16 or 20 (inches) standard
OD
78" maximum
Coil Weight
40,000 lbs maximum
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