API 5L ASTM A252 hot rolled black square rectangular hollow section welded Hot 

Dip Galvanized MS carbon steel pipe tube

The strip is cut into narrow strips of steel, which are then moulded into tubes. A special welder then welds the seam together. External weld is polished. 

The inner burr of the general welded pipe is not played. Internal burrs are only used for precision welded pipes.

Main products: seamless square pipe, large diameter square pipe, galvanized square pipe, welded pipe, seamless steel pipe, boiler pipe,

galvanized spiral pipe, galvanized seamless pipe, spiral pipe, shaped pipe

1. Black parts inspection → hanging material → degreasing → rinsing → pickling → cleaning → dipping agent → hot air drying

→ hot dip galvanizing → inside and outside blowing → cooling → passivation and rinsing → unloading → inspection, dressing

→ typing labeling → packing into storage and transportation.
Galvanized strip → uncoiling → stretching → rolling → welding → scraping → passivation and rinse → zinc filling → shaping

→ typing mark → cutting → packing → drying → weighing.

Product Features:

Corrosion resistance

High temperature oxidation resistance

Thermal stability

Machinability

Application areas:

Straight seam steel pipe is mainly used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction.  

For liquid transportation: water supply, drainage.  

For gas transportation: gas, steam, liquefied petroleum gas.  

For structural use: for piling pipes, Bridges;  Pipe for wharf, road, building structure, etc.  

(1)Quality Zhongxiang steel introduces the advanced testing equipments and builds up a professional scientific research team, strictly control

the quality on each steps of production. including inspection on raw materials entry, product's color analysis during production,T-bend test, impact

test, salt-spray test, tensile test and packaging testing on exported products , which ensures its integrated performance such as corrosion resistance, coating stickiness etc and the safety of transportation.

(2)Service Nowadays, the economic globalization is facilitating international operation, our company go to many countries and regions to participate

in the steel industry exhibition. our Products sell pretty well not only in domestic market, but also prevails in Europe,such as southeast Asia, Russia,

Ukraine, the United States, Ireland, Singapore, Dubai, Colombia and other countries and regions, which has earned the customers trust & compliment and successfully transitioned from home to abroad.