Zhengzhou Huitong Pipeline Equipment Co.,Ltd.
Zhengzhou Huitong Pipeline Equipment Co., Ltd.
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1.Difference between SMLS pipe fittings and welded pipe fittings
In general, the quality of seamless stainless steel pipe fittings is better than that of seamless stainless steel pipe fittings, because the seamless stainless steel pipe fittings are made of the accurate cold-rolled sheet that has passed the inspection, so any defect is limited to the welding position. Seamless tube is made of stainless steel by punching, which leads to many tears in the tube wall formed by extrusion. The eddy current test shows that the defective rate of stainless steel tube with seam is usually lower than that of seamless stainless steel tube. Using ultrasonic testing, the background noise of seamless stainless steel pipe is so large that it is difficult to find its defects. However, the background noise of stainless steel pipe with seam is very low, so it is easy to find the defect.
2.About Stainless steel 304:
| Cr
| Ni
| C
| Mn
| Si
| P
| S
| Fe
| |
| MIN
| 18.0
| 8.0
| 0.04
| –
| –
| –
| –
| –
|
| MAX
| 20.0
| 10.5
| 0.10
| 2.0
| 0.75
| 0.04
| 0.03
| Balance
|
| Minimum
| Typical
| |
| Ultimate Tensile Strength, ksi
| 75
| 90
|
| 0.2% Yield Strength, ksi
| 30
| 35
|
| Elongation, %
| 40
| 60
|
| Temperature, °F
| 200
| 400
| 600
| 800
| 1000
| 1200
| 1400
| 1500
|
| stress, ksi
| 20.0
| 18.3
| 16.6
| 15.2
| 14.0
| 6.1
| 2.3
| 1.4
|
2.Packaging and transportation: