Standard Specification for
Rail-Steel and Axle-Steel Deformed
Bars for Concrete Reinforcement
AASHTO Designation: M 322M/M 322-07
ASTM Designation: A 996/A 996M-06a
1.1.This specification covers rail-steel and axle-steel bars for concrete reinforcement.
Three types of product are included, designated with a “rail symbol” and an “R” for bars made of rail-steel and with an “A” for bars made of axle-steel.
The standard sizes and dimensions of deformed bars and their number designations are given in Table 1.
All sizes and grades of all types may not be readily available; manufacturers should be consulted to verify availability.
1.2.The text of this specification references notes and footnotes that provide explanatory material.
These notes and footnotes, excluding those in tables and figures, shall not be considered as requirements of the specification.
1.3.Type “rail symbol” and Type Rare of two minimum yield levels, namely 350 MPa (50 000 psi] and 420 MPa [60 000 psi] designated as Grade 350 (50) and
Grade 420 (60], respectively. Type A is of two minimum yield levels, namely 300 MPa (40 000 psi] and 420 MPa (60 000 psi]
designated Grade 300 (40) and Grade 420 [60).
Click below to download AASHTO Designation: M 322M/M 322-07 pdf free
Click here to download AASHTO Designation: M 321-04 pdf free download