SA 178 Grade D Boiler Tube

 

A178 GRD boiler tube is an electric resistance welded carbon steel tube that complies with American standards, typically used in boilers, heat exchangers, and superheaters in high-temperature and high-pressure equipment.

SA 178 GrD ERW Boiler Tube Specification

Standard	A178/ SA178 ERW Carbon Steel Boiler and Super Heater Tubes
OD	12.7-127mm
WT	0.9-9mm
Length	6-25m
Material	Carbon
Type	ERW (Electric Resistance Welded)
Delivery condition	Cold condition or heat treatment
Delivery time	35-45 days after receiving 30% deposit in advance

Chemical Composition of ASTM A178 GrD Welded Pipe

Element %	Low carbon steel	Medium Carbon Steel	Manganess Steel
C	0.06-0.18	0.35 Max	0.27 Max
Mn	0.27-0.63	0.80 Max	1.00-1.50
P	0.035	0.035	0.030
S	0.035	0.035	0.015
Si	...	...	0.10 Min.

ASTM A178 GrD ERW Tubing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A178 GRD welded pipes undergo full-body ultrasonic testing, which primarily includes direct contact method and immersion method.

1. Direct Contact Method:
The ultrasonic probe is coated with a thin layer of coupling agent between the probe and the test surface, allowing direct contact. This method is convenient to operate, produces simple inspection graphics, and is easy to interpret with high defect detection sensitivity. It is the most widely used method in practical testing but requires high precision of the test surface.

2. Immersion Method:
This method involves immersing the ultrasonic probe and the workpiece in liquid as the coupling agent for testing. The liquid can be oil or water. The immersion method is further divided into full immersion and partial immersion.
This approach is suitable for rough surfaces, minimizes probe wear, ensures stable coupling, provides good repeatability of detection results, and facilitates automated testing. However, in the immersion method, there is significant attenuation of sound waves propagating through the pipe wall. A better solution is using a water film method instead of full immersion for sound coupling.

Hot Tags: sa 178 grade d boiler tube, China sa 178 grade d boiler tube manufacturers, suppliers, Alloy Gr 1 CR High Pressure Boiler Pipe, Resistance-welded pipe, hollow sections, Boiler steel pipes, round steel pipes, JIS G3445 Electric Welded Pipe