JIS G3101 SS400 SSAW Pipe

SS400 steel pipe is a Japanese standard carbon structural steel pipe, equivalent to China's Q235 steel. In the Japanese steel grades (JIS series), ordinary structural steel grades consist mainly of three parts: SS400-where the first 'S' stands for Steel, the second 'S' for Structure, and 400 denotes the lower limit of tensile strength of 400 MPa, indicating it is a general structural steel with a tensile strength of 400 MPa.

JIS G3101 SS400 SSAW Welded Pipe Specification

Place of Origin:	China
Oiled or Non-oiled:	Non-oiled
Alloy Or Not:	Non-Alloy
Tolerance:	±1%
Outer Diameter:	13 - 600 mm
Wall Thickness	0.4-25mm
Length:	1-12m
Shape:	Round, Square or Rectangular
Processing Service	Bending, Welding, Decoiling, Punching, Cutting
Technology	hot rolled, cold rolled, black annealed
Certificate:	ISO9001, SGS
Package	Standard Seaworthy Packing, tied with steel trips,then wrapped by plastic material or as request
Payment Term:	L/C T/T (30%DEPOSIT)

SS400 Welded Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Inspection of SS400 Spiral Steel Pipes

1. Visual Inspection:
Visual inspection of spiral pipes is a widely used and simple testing method, crucial for product inspection to detect defects and deviations, particularly on the surface of weld seams. This inspection is typically conducted visually using standard models, instruments, and tools such as magnifying glasses. Surface defects and welding flaws may indicate internal issues.

2. Physical Testing Methods:
Physical testing methods rely on detecting physical phenomena or using specific physical testing techniques. Non-destructive testing methods are generally employed to inspect defects inside materials or within the welds of spiral pipes. Methods include ultrasonic testing, radiographic testing, penetrant testing, magnetic particle testing, etc.

3. Hydrostatic Test Standards for Spiral Steel Pipes:
Every pipe undergoes a hydrostatic test to ensure there are no leaks. The test pressure (Mpa S-static hydrostatic test pressure) is calculated as P = 2ST/D, where D is the pipe diameter. For pipes with D < 508, the test duration is less than 5 seconds; for D ≥ 508, the test duration is less than 10 seconds. Weld seams, steel head joints, and circumferential welds undergo non-destructive testing, typically using X-ray or ultrasonic inspection. For pipes transporting inflammable fluids, 100% X-ray or ultrasonic testing is required. For general heating fluid transport pipes (water, sewage, air, steam), spiral welds should undergo X-ray or ultrasonic testing (20%).

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