Sunlight Panel Greenhouse | The difference between spiral steel pipe 9711 psl1 and psl2

Ministry standard and national standard are currently the two most common standards for spiral steel pipes, but in terms of thickness and testing, the national standard is higher than the Ministry standard.

1. Thickness

The thickness of the national standard and the cloth standard are different. The allowable range of the national standard thickness is within 0.5mm.

2. Testing

All national standards adopt ultrasonic detection, and the cloth standard adopts random inspection.

The diameter of the national standard spiral steel pipe 273 is the 273 spiral steel pipe with the 9711 implementation standard that we often say.

237 spiral steel pipe is one of the more common spiral steel pipe specifications. The current common thicknesses are mainly 6mm, 7mm, and 8mm.

The mechanical properties of Q235b spiral steel pipe are determined by the material Q235b. Q235B steel plate is a kind of low carbon steel. The national standard GBT 700-2006 "Carbon Structural Steel" has a clear definition. Q235B is one of the most common steel products in China, with low price, and can be used for most products with low performance requirements.

Psl1 and psl2 are different grades in the national standard spiral steel pipe, and the psl2 grade is higher, and the quality of the spiral steel pipe is stricter.

GBT9711.1 is compiled according to API 5L PSL1 in our country, and the content is basically consistent with the expression in API 5L PSL1. The two are mainly aimed at line pipes for oil and natural gas. The requirements for steel grades and inspection methods are relatively higher than those of GBT3091-2008.

PSL1 spiral steel pipe

1. The delivery status of the PSL1 spiral steel pipe is selected by the manufacturer, and the delivery status of the PSL2 steel pipe should meet the steel name specified in the order contract.

2. The steel used for PSL2 steel pipes should be fine-grain killed steel, which is not specified in PSL1.

3. The steel strip or steel plate used to manufacture PSL2 steel pipe should not have any repair welding seam, and repair welding is not allowed on the pipe body; PSL1 steel pipe does not have this requirement.

4. The chemical composition of PSL1 and PSL2 steel pipes of the same strength level are different.

5. The steel grade of PSL1 steel pipe is L485X70, and the steel grade of PSL2 steel pipe is L830MX120M.

6. The yield strength and tensile strength of PSL1 steel pipes are only specified in small values, there is no specified value, and there is no specified yield strength; PSL2 steel pipes not only specify the small values of yield strength and tensile strength, but also specify the value and at the same time. The value of the yield ratio.

7. The body and weld of PSL2 steel pipe require impact test (CVN), but there is no requirement for PSL1 steel pipe. The pipe body of PSL2 steel pipe requires a drop weight test (DWT), but there is no requirement for PSL1 steel pipe.

The above are the main differences between PSL1 and PSL2 steel pipes. Although they are not comprehensive, they reflect that the quality requirements of PSL2 steel pipes are generally higher than that of PSL1 steel pipes. Moreover, when signing a contract, PSL2 steel pipes often have detailed additional technical requirements.

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