Specification for Hot-dipped Galvanized Electric Resistance Welded Iron Steel Pipe for High Pressured Services.
ERW GI GRADE B – Sch.40
Zinc Coating ≥ 1.8 oz/ft2 (0.55 kg/m2)
Composition and Properties
As prescribed by ASTM Standards, the chemical and mechanical requirements for Electric Resistance Welded Galvanized Iron Pipe are as follows.
Mechanical Properties Gr. B
Yield Point : ≥240MPa (35 000 psi)
Tensile Point : ≥415 MPa (60 000 psi)
Elongation : 17%-30%
Weight: +10%, -3.5%
40mm and Below : ∓0.40mm
50mm and Above : ∓1%
Wall Thickness : ∓12.50%
BENEFITS OF RNW PACIFIC ERW BI PIPES
The life expectancy of galvanized coatings on typical structural members is far in excess of 50 years in most rural environments, and 20 to 25 years plus, even in severe urban and coastal exposure.
Galvanizing is almost invariably the cheapest in the long term (because it lasts longer and needs less maintenance). Maintenance causes problems and adds to costs when structures are located in remote areas, and when plant shutdown is involved.
Coating life and performance are reliable and predictable.
Every part of a galvanized article is protected, even recesses, sharp corners and inaccessible areas. No coating applied to structure or fabrication after completion can provide the same protection.
ERW BI AND GI PIPES SPECIFICATION Sch. 40