What is ASTM A416?

ASTM A416 Tensile Breaking Elongation Stress Relaxation

The ASTM A416 tensile test addresses the breaking, elongation, and stress relaxation properties of steel wire. It specifies the standard types and grade requirements for seven-wire, uncoated steel strands used in pre-tensioned and post-tensioned pre-stressed concrete construction. ASTM A416 identifies two types of strands: low-relaxation and stress-relieved (normal relaxation).

The base metal must be carbon steel and undergoes continuous thermal and mechanical treatment. Mechanical testing methods, conducted per ASTM A416, determine breaking strength, yield strength, elongation, and stress relaxation properties. Strands must meet the mechanical attributes specified. Finished products under ASTM A416 are supplied on reels or in reelless packs and must be marked with two strong tags for identification. These requirements also apply to pre-stressed ground anchor construction.

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Standard Specification for Low-Relaxation, Seven-Wire

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