Hot Rolled Square & Round Bars

Conforms to: ASTM A36.

Related Specifications: ASTM A6.

Chemistry:

Thickness (mm)	To 3/4	Over ¾ to 1-1/2	Over 1-1/2 to 4	Over 4
	(20)	(20 to 40)	(100)	(100)
Carbon	0.26	0.27	0.28	0.29
Manganese	NA	0.60-0.90	0.60-0.90	0.60-0.90
Phosphorus	0.04	0.04	0.04	0.04
Sulfur	0.05	0.05	0.05	0.05
Silicon	0.40	0.40	0.40	0.40
Copper	0.20	0.20	0.20	0.20

Mechanical Properties:

Tensile Strength (ksi) 58-80

Yield Point (ksi) 36 min.

Elongation in 8 in. 20% min.

Elongation in 2 in. 21% min.

Straightness of Flat Bars

Max. Permissible Variations in Straightness

¼ in any 5 ft. or ¼ times (# of ft. of total length/5)

*Permissible variations in straightness do not apply to hot-rolled bars if any subsequent heating operation has been performed

Permissible Variations for Square &Round Bars (Per ASTM A6, Table 27)

Specified Size	Variations from Size, In.		Out of round or square, in. *
	+	-
To 5/16, incl.	0.005	0.005	0.008
5/16 to 7/16 incl.	0.006	0.006	0.009
7/16 to 5/8 incl.	0.007	0.007	0.010
5/8 to 7/8 incl.	0.008	0.008	0.012
7/8 to 1 incl.	0.009	0.009	0.013
1 to 1-1/8 incl.	0.010	0.010	0.015
1-1/8 to 1-1/4 incl.	0.011	0.011	0.016
1-1/4 to 1-3/8 incl.	0.012	0.012	0.018
1-3/8 to 1-1/2 incl.	0.014	0.014	0.021
1-1/2 to 2 incl.	0.015	.015	0.023
2 to 2-1/2 incl.	0.031	0	0.023
2-1/2 to 3-1/2 incl.	0.047	0	0.035
3-1/2 to 4-1/2 incl.	0.062	0	0.046
4-1/2 to 5-1/2, incl.	0.078	0	0.058
5-1/2 to 6-1/2, incl.	0.125	0	0.070
6-1/2 to 8-1/4, incl.	0.156	0	0.085
8-1/4 to 9-1/2, incl.	0.187	0	0.100
9-1/2 to 10, incl.	0.250	0	0.120

* Out-of-round is the difference between the maximum and the minimum diameters

of the bar, measured at the same transverse cross section.

* Out-of-square section is the difference in perpendicular distance between opposite

faces, measured at the same transverse section.

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