ASME SA572 Grade 55 steel

ASTM A572M “Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel” covers five grades of high-strength low-alloy structural steel shapes, plates, sheet piling, and bars. Grades 42 [290], 50 [345], and 55 [380] are intended for riveted, bolted, or welded structures. Grades 60 [415] and 65[450] are intended for riveted or bolted construction of bridges, or for riveted, bolted, or welded construction in other applications. Katalor always keeps thousands of high-strength low-alloy plates including SA572 Grade 55 plates.

 

ASME SA572 Grade 55 Chemical Composition

Grade	C max	Mn max	P max	S max	Si max
SA572 Gr.55	0.25	1.35	0.03	0.03	0.15-0.40

ASME SA572 Grade 55 Mechanical Property

Grade	Yield Strength Mpa	Tensile Strength Mpa	Elongation % in 200mm	Elongation % in 50mm
SA572 Gr.55	380	485	17	20

SA572Grade 55 is one of grade in standard ASTM SA572. For the plates and bars of SA572Grade 55, the max thickness(or diameter) is 2in(50mm), while the structural shape flange of leg thickness, sheet pilings, zees and roiled tees of A572Gr. 55 has no maximum sizes limitation.
The plates A572Gr.55 in thickness≤40mm, shapes A572Gr.55 with flanges or legs in thickness ≤75mm, the Silicon content is Max. 0.4%; while the plates thickness>40mm, shapes with flanges or legs thickness >75mm, the Silicon content has higher and lower limitation with range 0.15-0.4%.
Commonly the elongation of steel A572Gr.55 is min 17% (in 8 inches or 200mm) and 20% (in 2 inches or 50mm), But for plates A572Gr.55 wider than 24 in. [600 mm], the elongation requirement is reduced 2% points. See elongation requirement adjustments in the Tension Tests section of Specification A6/A6M.