Product Details
Residential Gas Types Pipelines It can destroy the cast structure of ingot, refine the grain of steel and eliminate the defect of microstructure, so that the microstructure of steel is compacting and the mechanical properties are improved.
residential pipe lining specifications
Brief Introduction
Residential Gas Types Pipelines
Cold rolled | Hot rolled | ||
Grade | GB Q195 | Grade | GB Q195-Q235 |
Section | Round, Square, Rectangular, LTZ | Section | Round, Square, Rectangular |
Technique | ERW | Technique | ERW |
Surface | Black, Oiled, | Surface | Black, Oiled, |
Or Painted as request | Or Painted as request | ||
Thickness | 0.5-1.5mm | Thickness | 1.5-12mm |
OD | 15-100mm | OD | 21-508mm |
15*15-75*75mm | 20*20-500*500mm | ||
10*20-40*80mm | 20*30-300*600mm | ||
Length | 5.8m , 6m , 12m or as request | Length | 5.8m , 6m , 12m or as request |
Tolerance | Thickness : +/- 0.05mm | Tolerance | Thickness : +/- 0.25mm |
OD: +/- 0.5mm | OD: +/- 2mm | ||
Length : +/-20mm | Length : +/-20mm | ||
Package | In bundles | Package | In bundles |
Or wrapped with woven cloth as request | Or wrapped with woven cloth as request |
Characteristics of hot rolling process introductions
It can destroy the cast structure of ingot, refine the grain of steel and eliminate the defect of microstructure, so that the microstructure of steel is compacting and the mechanical properties are improved.The improvement is mainly reflected in the rolling direction so that the steel is no longer isotropic to some extent.Bubbles, cracks and looseness formed during pouring can also be welded under high temperature and pressure.
After hot rolling, the non-metallic inclusions (mainly sulphides and oxides, as well as silicates) inside the steel are laminated and layered.Delamination greatly deteriorates the tensile properties of steel along the thickness direction and may cause interlaminar tears when the weld seams shrink.The local strain induced by weld shrinkage is often several times of yield point strain and much larger than that caused by load.
