Long Reach Boom | Super Long Front Material Introduction Part 3 - Q550D Steel - SUP Construction Equipment Co.Ltd.

Introduction

The GB Q550D steel plate is a high-strength material used extensively in engineering and structural applications. This paper provides a detailed overview of its composition, properties, production, and applications, emphasizing its importance in modern construction and machinery.

Steel Composition and Standards

GB Q550D steel is defined by its yield strength of 550 MPa, with standards set by GB/T 16270-2009 and GB/T1591-2018. The steel’s chemical composition includes controlled amounts of Carbon, Silicon, Manganese, Phosphorus, and Sulfur, which collectively determine its mechanical properties and suitability for various applications.

Chemical Composition(Wt.%):

STEEL GRADE	C max	Si max	Mn max	P max	S max	Cu max
Q550D	0.2	0.8	1.7	0.02	0.01	0.5
Cr max	Ni max	Mo max	B max	V max	Nb max	Ti max
1.5	2	0.7	0.005	0.12	0.06	0.05

Mechanical Properties

The Q550D steel plate exhibits high yield strength and elongation, making it suitable for demanding environments. Its impact toughness is significant at various temperatures, ensuring reliability in low-temperature conditions and high-stress applications.

Material Properties

STEEL GRADE	Re yield strength Mpa min			Re yield strength Mpa min			elongation %	Energy and temperature
							Min	0	-20	-40	-60
	t≤50	50-100	100-150	t≤50	50-100	100-150		J	J	J	J
Q550D	550	530	490	640-820	640-820	590-770	16	47	47	34	34

Production and Treatment

Steel plates are smelted using converters or electric furnaces and are typically delivered in a quenched and tempered condition. Additional surface treatments like shot blasting and coating are applied to enhance performance and durability.

Applications

Q550D steel is used in the construction of bridges, highway infrastructure, and mining equipment. Recent advancements include the production of 110 mm thick plates, which extend the material’s application range to more demanding environments.

 

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