S235JR Spiral Welded Pipe

 

S235JR spiral welded pipe is a European standard ordinary carbon structural steel pipe, equivalent to the national standard Q235B spiral welded pipe. The delivery conditions for S235JR spiral welded pipe include hot rolling, controlled rolling, and normalizing. Without special technical requirements, hot-rolled delivery is usually sufficient.

S235JR SSAW Welded Pipe Specification

Wall Thickness	1.7mm-36mm
OD	10.3mm-609.6mm
Length	5000mm-12000mm
Origin	China
Packing	Standard export packing
Transportation	By sea or railway
Terms of Delivery	FOB/CIF/CFR or etc.
Payment terms	T/T, L/C

 

S235JR Spiral Welded Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

How to Prevent Cracks in Spiral Welded Pipes

1. Tempering Immediately After Quenching: Many spiral steel pipe cracks do not occur during quenching and cooling but manifest after being removed from the quenching medium, after a period of time, known as aging cracks. These are caused by significant quenching stress, which can be effectively prevented by immediate tempering after quenching.

2. Self-Tempering Using Residual Heat: For steels sensitive to cracking, utilizing the residual heat from quenching for self-tempering can effectively prevent quenching cracks in spiral steel pipes.

3. Using Lower Quenching Temperature and Shorter Soaking Time: For high-alloy steels, considering the poor thermal conductivity due to multiple alloy elements, adequate preheating (one or multiple times) is necessary.

4. Precooling Critical Areas: For areas prone to quench cracking (e.g., threaded holes, edges, grooves), asbestos rope or iron sheets should be used for wrapping, and appropriate pre-cooling should be done during quenching to prevent cracking due to rapid cooling in weak spots.

5. Selecting Slow-Cooling Media: When using oil cooling for spiral steel pipes, avoid cooling in water. Control the time spent in the cooling medium, generally cooling until near the spiral steel pipe temperature before air cooling. To prevent cooling cracks during single-liquid quenching, a high-concentration or nitrate salt solution can be used as the cooling medium, which can prevent quenching cracks in complex-shaped workpieces.

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