Mechanical properties of API drill pipe grades

Grade

Yield strength

Tensile strength

API

psi

N/mm2

min.

psi

N/mm2

max.

psi

N/mm2

min.

E-75

75 000

515

105 000

725

100 000

690

Spec. 5 DP

X-95

95 000

655

125 000

860

105 000

725

Spec. 5 DP

G-105

105 000

725

135 000

930

115 000

795

Spec. 5 DP

S-135

135 000

930

165 000

1 140

145 000

1 000

Spec. 5 DP

Mechanical properties of API tool joint grades

Yield strength

Yield strength

Tensile strength

Elongation

Box

psi

N/mm2

min.

psi

N/mm2

max

psi

N/mm2

min

in 2 inches

%

min

Hardness

Brinell

min

120 000

827

165 000

1138

140 000

965

13

285

Chemical composition requirements

Pipe body

Phosphorus

max. %

Sulfur

max. %

Pipe body grade E

0.030

0.020

Pipe body grades X, G and S

0.020

0.015

Tool joint

0.020

0.015