1 Overview

With the large number of railway seamless lines laid, in the line maintenance process, based on the low-contamination safety hazard of the rail-welded joints, it has become one of the main reasons for the breakage of the welded joints of the seamless line rails, and it is difficult to maintain in daily line maintenance. Effective elimination of radical cures will seriously affect the high-speed and safe operation of railways.

Related researches show that the main reason for the low collapse of seamless track rail joints is that the hardness of welded joints is lower than the hardness of the base materials on both sides. Therefore, in the process of seamless line laying, the hardness of the welded joints of the rails is improved by post-weld heat treatment. Effectively avoid low-level hidden dangers. However, it has been proved by practice that the hardness of the welded joint area is improved, and the low collapse phenomenon is still obvious. The post-weld heat treatment measures are not really effective to eliminate the low collapse. It is urgent to find a new solution.

For more details, please refer to the attachment or the contents of the 20th issue of Metalworking (Hot Processing).

Spiral steel pipe

Spiral steel pipes are made by steel coil, extrusion forming under the normal temperature, then taken the technology of double wire and double-faced submerged-arc welded.

During molding process of spiral welded steel pipe, steel plate has uniform deformation and light residual stress, thus the surface has no scratches. Spiral Steel Pipe has more flexible thicknesses and diameters, especially in making high-grade thick pipes with small or medium aperture, these techniques has incomparable advantages in satisfying your needs.

Application:

Spiral steel pipe is mainly used in public waterworks, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction etc.

For liquid transportation: water supply, drain water, petroleum transportation, etc.

For gas transmission: coal gas, steam, liquefied petroleum gas, gas etc.

For structure: piling, bridge, wharf, road, architectural structure, etc.

Material:

Q235A, Q235B, 10#, 20#, Q345(16Mn), L245(B), L290(X42), L320(X46), L360(X52), L390X56), L415(X60), L450(X65), L485(X70), L555(X80), L290NB/MB(X42N/M), L360NB/MB(X52N/M), L390NB/MB(X56N/M), 415NB/MB(X60N/M), L450MB(X65), L485MB(X70), L555MB(X80)

process

Packaging Details

Plastic caps on both ends, Steel bundle, Woven bag or acc. to customers' request.

Delivery Time

15 days after receiving deposit

Spiral Steel Pipe

Spiral Steel Pipe,Spiral Weld Pipe,Hsaw Pipe,Api5L X60

HEBEI CHENGYUAN PIPE INDUSTRY GROUP CO.,LTD , https://www.hbcytube.com