Page 91 - McWane Poles Sales Manual 2024

Sales Manual • 2024
91
1.9 Material Properties
A. The ductile iron used to manufacture the centrifugally cast pole sections shall be tested according
to ASTM A536 and conform to the following criteria per ANSI C151:
•
Ultimate Tensile Strength: 60,000 psi minimum
•
Yield Strength (0.2 % offset): 42,000 psi minimum
•
Total Elongation: 10% minimum
B. The ductile iron used to manufacture the base plates and caps sections shall be tested according
to ASTM A536 and conform to either the same criteria as the pole sections listed above or the
following criteria per ANSI C110 at the manufacturer’s discretion:
•
Ultimate Tensile Strength: 70K psi minimum or 65K psi minimum
•
Yield Strength (0.2 % offset): 50K psi minimum or 45K psi minimum
•
Total Elongation: 5% minimum or 12% minimum
In summary, base plate criteria can be (70-50-5) or (65-45-12).
C. The use of ductile iron manufactured from recycled materials is strongly encouraged and
preference will be given to manufactures using such material. The content of recycled material
shall be at least 75% of the total weight of the pole. Recycled material specifically means steel or
iron material purchased for the purpose of regeneration, not internal plant process scrap.
1.10 Chemical Properties
A. The ductile iron used to manufacture the centrifugally cast pole sections shall use the following
chemical composition as a targeted guideline to meet above material properties:
•
Carbon 3.4%
•
Silicon 2.2%
•
Magnesium 0.023%
•
Sulfur 0.009%
B. Tramp elements such as Chrome, Copper, Tin, Manganese and other elements may be present in
the final product. The amount of tramp elements is low in comparison to carbon and silicon and is
not controlled by this specification.
C. Iron shall constitute the balance of the chemical makeup of the ductile iron utility pole, at
approximately 93%.