What is the difference between QU100 and QU120

Sep 29, 2025

QU100 and QU120 are both heavy-duty crane rail models in the GB standard. However, they have significant differences in cross-sectional dimensions, weight per meter, and typical application scenarios.

First are the geometric dimensions and weight. QU100 has a nominal height of approximately 150 mm, a head width of approximately 100 mm, and a base width of approximately 150 mm. Its theoretical weight is about 88.9 kg/m. In contrast, QU120 has a height of approximately 170 mm, a head width of approximately 120 mm, and a base width of approximately 170 mm. Its weight per meter can reach 118 kg/m. It is evident that QU120 has significantly larger cross-sections in the head, web, and base. This results in greater overall stiffness and load-bearing capacity.

Rail Type		SIZE(mm)				theoretical weight
		height	bottom width	head width	waist depth
Crane rail	QU70	120	120	70	28	52.8
	QU80	130	130	80	32	63.69
	QU100	150	150	100	38	88.96
	QU120	170	170	120	44	118.1

QU100 rail QU120 rail

Next are the load-bearing capacity and suitable environments. QU100 is suitable for heavy-duty but relatively moderate crane applications. These include large plant overhead cranes and container yard gantry cranes. It meets the demands of high-frequency operation with considerable wheel pressure. QU120, however, is designed specifically for ultra-heavy-duty or extreme environments. Examples include ultra-large port quay cranes and ladle car tracks in metallurgical plants. It is needed for conditions requiring higher wheel pressure, impact resistance, and fatigue cycles.

port crane qu rail

Material-wise, both often use the same high-strength steel grades, such as U71Mn. Surface quenching or anti-corrosion treatment can be applied based on requirements. However, due to its larger cross-section, QU120 demands higher equipment and process standards for heat treatment and installation. This leads to relatively higher construction costs.

Steel Grade	C(%)	Si	Mn	Cr	V	P	S	Tensile Strength (Rm/MPa)
U71Mn	0.65~0.76	0.15~0.58	0.70~1.40	–	–	≤0.035	≤0.030	≥880

GNEE RAIL routinely supplies the full range of GB standard crane rails, including QU70, QU80, QU100, and QU120. We provide one-stop processing services such as cutting, drilling, end grinding, and anti-corrosion coatings. We can recommend the most suitable model and provide a complete installation plan based on your crane parameters, wheel load, and site foundation conditions. Please feel free to contact our technical team for detailed dimensional data, material reports, and project quotations. We will help you select the most appropriate crane rail for your project.