AISI 4145 low alloy tube pipes

Products Mode: AISI 4145 low alloy tube pipes


Low alloy 4145: ASTM A29 (VO1.05)

General scope

AISI 4145 low alloy steel containing 0.20% Molybdenum is widely used particularly throughout oil patch applications. Similar to 4140 which has a lower carbon level it has improved hardenability and is more is commonly used in the higher strength 110 KSI 

Larger diameters are often supplied with higher Molybdenum level, 0.35% max and may be referred to as a "Drill Collar" analysis.

The hardenability limitations of this grade (depth to which it will harden / obtain the specified mechanical properties after heat treatment) must always be taken into account when designing and selecting equipment.

Chemical composition


C

Si

Mn

P

S

Cr

Mo

Fe

Min

0.43

0.15

0.75

0.80

0.15

0.00

Max

0.48

0.35

1.00

0.035

0.040

1.10

0.25

0.00

Mechanical properties

Condition: Hardened and Tempered to 22 HRC max

U.T.S

100 KSI Min

(689 N/mm2)

0.2% Proof Stress

80 KSI Min

(551 N/mm2)

Elongation

20 %


Red of Area

40 %


Condition: Hardened and Tempered to 30-36 HRC max

NACE MR0175 limits the supply hardness to 22HRC max.

U.T.S

130 KSI Min

(896 N/mm2)

0.2% Proof Stress

110 KSI Min

(758 N/mm2)

Elongation

13 %


Red of Area

30 %



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