Crane Rail

Crane rails are designed for carrying heavy loads and are used in the laying of crane track for port building.Compared with the railway's heavy rail, crane rail height is low and head width thick waist size is bigger.

In China, Crane rail includes QU70, QU80, QU100,QU120 Crane rail.

Technical Requirements

Marks and Chemical Components

The marks and chemical components of crane rail should meet requirements in Table 1  
Table 1

Manufacture

· Crane rail is made of killed steel made by open hearth smelting.

· Manufacturing technique that does not generate white points in crane rail should be adopted.

Mechanical Property 

The strength of extension of rail should be no less than 90kg/mm2.

The Quality of Surface

· There should be no crack, fold, scar, bubble, or impurity on the surface of rail. It is allowed to have indentations and scratches of which depth are within the allowable minus deviation, and hairlines that are not over 1mm deep. 

· There should be no crack, layer, and shrinkage cavity remnant on the end face of rail.

· The end face of rail should be cut vertically, and the skew of end face should be no less than 5mm in any direction. Rags that are over 4mm long should be grinded.

· Use air chipper to clean the flaws on the surface lengthways. The working depth should not be over the allowable deviation.

· The flaws on the surface are not allowed to weld and fill up.

Test Methods

The sample number, sampling location and test methods of every group of crane rails are as the following table.
Table 2

Inspection Rule

Inspection, and Acceptance

The technical supervision department of supplier take the responsibility of inspection and acceptance.

Lot Grouping Rule

The crane rails should be checked and accepted groups by groups. Every group should be formed by crane rails of the same model and with the same retort number.

Sample Number

· Sample number is stipulated by Table2.

· If the manufacturer can guarantee the strength extension meet the requirement, usually the inspection will be omitted. But when the demander ask for inspection, strength extension test should be carried out.

Package, Mark, Quality Certificate

Cleared and Raised Mark Should be Rolled on the Waist of Crane Rail:

a. Trademark of Manufacture
b. Model
c. Year and month of Manufacture

Every Crane Rail Should Have Mark of the Steel, Smelting Number, and Mark of Quality Supervision Department.