Figure1 
Types of nominal size of bars 
Ultimate Tensile Stress N/mm^{2} minimum 
Yield Stress N/mm^{2} 
Elongation Percent minimum 
Mild Steel Grade I or Grade 60 

For bars up to 20mm 
410 
250 
23 
For bars above 20mm upto 50 mm 
410 
240 
23 
Mild Steel GradeII or Grade 40 

For barbars to 20mm 
370 
225 
23 
For bars above 20mm up to 50 mm 
370 
215 
23 
Medium Tensile Steel Grade75 

for bars up to 16mm 
540 
350 
20 
for bars above 16 mm up to 32
mm 
540 
340 
20 
for bars above 32 mm up to 50 mm 
510 
330 
20 
Grade 
GRADE
40 
GRADE
60 
GRADE
75 
GRADE
80 
Minimum
Yield Strength (psi) 
40,000 
60,000 
75,000 
80,000 
Minimum
Yield Strength (MPa) 
280 
420 
520 
550 
Grade 
GRADE
60 
GRADE
80 
Minimum Yield Strength (psi) 
60,000 
80,000 
Minimum Yield Strength (MPa) 
420 
550 
Property 
Fe 415 
Fe 415D 
Fe 500 
Fe 500D 
Fe 550 
Fe 550D 
Fe 600 
Yield Stress 
415 
415 
500 
500 
550 
550 
600 
Ultimate Tensile Stress 
10 percent more than the actual 0.2 percent proof stress/ yield stress
but not less than 485.0 N/mm2 
12 percent more than the actual 0.2 percent proof stress/ yield stress
but not less than 500 N/mm2 
8 percent more than the actual 0.2 percent proof stress/ yield stress
but not less than 545 N/mm2 
10 percent more than the actual 0.2 percent proof stress/ yield stress
but not less than 565 N/mm2 
6 percent more than the actual 0.2 percent proof stress/ yield stress
but not less than 585 N/mm2 
8 percent more than the actual 0.2 percent proof stress/ yield stress
but not less than 600 N/mm2 
6 percent more than the actual 0.2 percent proof stress/ yield stress
but not less than 660 N/mm2 
Elongation (%) 
14.5 
18 
12 
16 
10 
14.5 
10 
Property 
GRADE 40 
GRADE 60 
GRADE 75 
Tensile
Strength psi[MPa] 
70000 [500] 
90,000[620] 
100,00 [690] 
Yield Strength psi [MPa] 
40,000[280] 
60,000[420] 
75,000[520] 
Type 
A1035 CL 
A1035 CM 
A1035 CS 

Grade 
Grade 100 [690] 
Grade 120 [830] 
Grade 100 [690] 
Grade 120 [830] 
Grade 100 [690] 
Grade 120 [830] 
Tensile Strength,
min, psi 
150,000 
150,000 
150,000 
150,000 
150,000 
150,000 
[MPa] 
[1030] 
[1030] 
[1030] 
[1030] 
[1030] 
[1030] 
Yield Strength
(0.2% offset), min, psi [MPa] 
100,000 [690] 
120,000 [830] 
100,000 [690] 
120,000 [830] 
100,000 [690] 
120,000 [830] 
Elongation in 8
in.[200 mm], min 

Bar Designation No.3 through 11 [10 through 36]14, 18, 20 [43, 57, 64] 

7 
7 
7 
7 
7 
7 

6 
6 
6 
6 
6 
6 
Property 
Type
R Rail
Steel Bars 
Type
A Axle
Steel Bars 

Grade 50 
Grade 60 
Grade 40 
Grade 60 

Tensile
Strength, Min, psi [MPa] 
80,000 [550] 
90,000 [620] 
70,000[500] 
90,000 [620] 
Yield Strength, Min, psi [MPa] 
50,000 [350] 
60,000 [420] 
40,000[280] 
60,000 [420] 
Steel 
GFRP 
CFRP 
AFRP 

Nominal
yield stress, ksi (MPa) 
40 to
75 (276 to
517) 
NA 
NA 
NA 
Tensile
strength, ksi (MPa) 
70 to
100 (483 to
1600) 
70 to
230 (483 to
690) 
87 to
535 (600 to
3690) 
250 to
368 (1720
to 2540) 
Elastic
modulus, x 10^{3} ksi (GPa) 
29.0 (200.0) 
5.1 to
7.4 (35.0
to 51.0) 
15.9 to
84.0 (120.0
to 580.0) 
6.0 to
18.2 (41.0
to 125.0) 
Yield
strain, percent 
0.14 to
0.25 
NA 
NA 
NA 
Rupture
strain, percent 
6.0 to
12.0 
1.2 to
3.1 
0.5 to
1.7 
1.9 to
4.4 
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