QU70 Crane Rail 52.8kg/m YB/T 5055 Heavy Crane

Rail & Fittings, Steel Rail

QU70 Crane Rail 52.8kg/m YB/T 5055 Heavy Crane

QU70 rail (52.8kg/m crane runway rail) is the mainstream light-medium load crane rail complying with Chinese standard YB/T 5055, widely specified in global factory crane construction projects. As a cyclic load bearing runway rail for overhead travelling cranes, it features optimized cross-section design, stable dimensional tolerance, excellent impact resistance and wheel wear resistance. It is the preferred rail type for indoor workshop light & medium tonnage cranes. U71Mn is the standard supply steel grade, while 50Mn and Q235B are available for low-budget, light-load projects upon request.

Email:

sales@imristeel.com

Phone:

+86 13646172523

Quote Now

Product Detail

Chemical Component

Product Detail

Parameter Item	Technical Data
Nominal Weight	52.8 kg/m
Rail Height	120.0 mm
Rail Head Width	70.0 mm
Rail Base Width	120.0 mm
Web Thickness	38.0 mm
Foot Thickness	24.0 mm
Standard	YB/T 5055
Available Steel Grades	U71Mn, 50Mn, Q235B
Standard Length	6m / 8m / 10m / 12m / Customized Cutting

Chemical Composition(YB/T 5055)

Grade	C (%)	Si (%)	Mn (%)	P (max)	S (max)
U71Mn	0.65–0.76	0.15–0.58	0.70–1.40	0.035	0.030
50Mn	0.48–0.56	0.17–0.37	0.70–1.00	0.035	0.035
Q235B	0.12–0.22	0.30	0.30–0.70	0.045	0.045

Mechanical Properties(YB/T 5055)

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation A (%)	Hardness (HB)
U71Mn	≥880	≥520	≥10	260–310
50Mn	≥735	≥390	≥12	220–260
Q235B	375–500	≥235	≥26	≤170

Core Advantages

QU70 crane rail adopts precision rolling process to guarantee consistent section geometry, reducing wheel abrasion during repeated crane operation. It delivers reliable impact resistance under frequent start-stop cyclic loads. Multiple steel grade options are offered to match different load conditions and project budgets. Mill Test Certificate (MTC) and full product inspection records can be provided for export customs clearance and third-party verification.