Specification:

AISI 4140 is a chromium molybdenum alloy steel specification widely used in the oil and gas industry. Similar to grade AISI 4130 but with a slightly higher carbon content.

American Iron and Steel Institute (AISI 4140) is a member of the low alloy tool steel family characterized by small quantities of trace elements added to an otherwise simple steel. These trace elements, when compared with more simple steel such as 1040, improves the characteristics of 4140. However, because 4140 remains relatively simple, it is used in a wider range of applications than more specialized tool steels like the D or S series of steel.

AISI 4140 has enough carbon present to allow for adequate heat treatment. Recommended hardening procedures are to bring the steel up to 1,675 degrees Fahrenheit for normalization (removal of stress within the steel). After it cools properly, heat the steel to 1,550 degrees Fahrenheit before quenching it in oil. The toughness of the steel makes machining in its hardened form difficult. However, after annealing the steel at 1,600 degrees followed by a slow cooling, the steel is much softer and far easier to machine. It can then be heat-treated after machining to produce a hard, precise item.

Mechanical Properties:

Condition Hardened & Tempered
UTS Min: 100 KSI
0.2% Proof Stress Min: 80 KSI
Elongation Min: 20 %
Reduction of Area Min: 40 %

Grade and Chemical composition:

Range C Si Mn P S Cr Mo
Min 0.38 0.15 0.75 0.8 0.15
Max 0.43 0.35 1 0.035 0.04 1.1 0.25

Size:

Hot-rolled:    OD:51-508 mm; WT: 7-60 mm; L: Max 16000 mm

Cold-Drawn: OD: 10-50 mm; WT: 2-10 mm; L: Max 16000 mm

Specifications in accordance with customer requirements.

Packing:

Beveled/black painting/plastic caps/in bundles/steel strips/wooden box/

accordance with customer requirements.

Surface treatment:

Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting, Epoxy & Fbe Coating Painting as requested

See also :

A213 Pipes

ASTM A213 Alloy Steel Boiler Tubes

A355 Pipes

ASTM A335 Seamless Alloy Steel Pipes

A519 Pipes

ASTM A519 Alloy Steel Mechanical Tubing

AISI 4130 Pipes

AISI 4130 Low Alloy Steel Pipes

AISI 4140 Pipes

AISI 4140 Alloy Steel Pipes

DIN 17175 Pipes

DIN 17175 Alloy Steel Pipes

EN 10297-1

EN 10297-1

EN 10216-1, EN 10216-2

EN 10216-1, EN 10216-2

EN 10297-1 Alloy Steel

EN 10297-1 Alloy Steel

EN 10210-1

EN 10210-1

Hastelloy C22

Hastelloy C22

Inconel 600

Inconel 600

Inconel 625

Inconel 625

Inconel 718

Inconel 718

Inconel 800

Inconel 800