What is the difference between a Cast-in Shoulder and a Weld-on Shoulder?

The Rail shoulder is semi-embedded part cast in the concrete rail ties to fix the elastic rail clip to the base plate, There are two Common types of rail shoulders available from GNEE RAIL, Cast-in Shoulder and Weld-on Shoulder, both of which are used for the fixing of elastic rail clips. One is Single Stem Iron Shoulder used in pre-stressed concrete ties and the other is Twin Stem Iron Shoulder used in Bi-Block or Twin Block concrete ties.

 

Customized rail shoulders for sale

 

• Materials: QT400-15,QT450-10,QT500-7,QT600-3,QT700-2,ZG25,ZG35,ZG45

 

• Model: Customized according to the drawing

 

• Surface: Plain-oiled, oxygen black

 

• Produce Type: Sand casting, hot forging

 

 

 

The main difference is their installation method: a cast-in shoulder is pre-embedded into a concrete sleeper during its manufacturing, while a weld-on shoulder is a component that is welded onto a steel base plate or steel sleeper. Cast-in shoulders are for standard concrete tie applications, whereas weld-on shoulders are used for steel sleepers or situations where standard installation isn't possible.

 

 

Feature	Cast-in Shoulder	Weld-on Shoulder
Installation	Pre-embedded into a concrete sleeper	Welded onto a steel base plate or steel sleeper
Primary Application	Standard concrete sleepers	Steel sleepers and base plates where standard sleepers cannot be used
Manufacturing Process	Cast iron	Hot forged
Flexibility	Less flexible, as it's a permanent part of the concrete sleeper	More flexible, as it can be welded on for adjustments or to meet specific design needs
Use Case	Used in standard railway tracks	Used in special layouts, switches, crossings, or for repairs/alterations

 

 

 

Application	UIC54	UIC60	115RE, ,50kg rail, 60kg rail,BS80lbs, BS100lbs, ect.
Name	QT500-7	QT450-10	QT400-15
Standard	GB 1348-88	GB 1348-88	GB 1348-89
Chemical composition(%)	C:3.60-3.80	C:3.40-3.90	C:3.50-3.60
	C:3.60-3.80	Mn:0.2-0.5	Mn:≤0.5
	Si:2.50-2.90	Si:2.70-3.00	Si:3.0-3.2
	P:≤0.08	P:≤0.07	P:≤0.07
	S:≤0.025	S:≤0.03	S:≤0.02
Tensile Strength	≥500 Mpa	≥450 Mpa	≥400 Mpa
Yield Strength	≥320 Mpa	≥310 Mpa	≥250 Mpa
Elongation(%)	≥7	≥10	≥15
Hardness	170~230HB	160~210HB	130~180HB
Metallographic organization	ferrite & pearlite	graphite & ferrite & pearlite	ferrite

 

Cast-in Rail Shoulder Mechanical Property

 

Material	QT500-7	QT450-10	QT400-15
Tensile Strength	≥500 Mpa	≥450 Mpa	≥400 Mpa
Yield Strength	≥320 Mpa	≥310 Mpa	≥250 Mpa
Elongation	≥7	≥10	≥15
Hardness	170~230HB	160~210HB	130~180HB

 

Cast-in Rail Shoulder Chemical Composition Requirement

 

Material	C	Si	Mn	P	S
QT400-15	3.6-.36	3.0-3.2	0.5	0.07	0.02
Qt450-10	3.4-3.9	3.7-3.0	0.5	0.07	0.03
QT500-7	3.4-3.8	2.5-2.9	0.6	0.08	0.025

 

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