Alloy Steel UNS G41450 Round Bars are a low alloy chromium molybdenum steel that is similar to 4140, and it has a different chemical composition, which contributes to its higher hardenability at greater diameters. The oil and gas industries frequently employ the chromium molybdenum alloy steel grade known as Alloy Steel 4145H AISI Round Bars. Numerous oil field tools, like drill collars, stabilizer forgings, drill pipes, and rotary subs, can also be used with it.

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AISI 4145H MOD Round bars have high dimensional accuracy and sturdy construction. We produce these Round Bars in different sizes and lengths AISI 4145H MOD is a chromium-molybdenum alloy specification, which offers good ductility and excellent shock-resisting characteristics. It is primarily supplied in the tempered condition and hardened form at the range of 30 to 36HRc. The 4145H AISI MOD contains higher carbon content which helps them to exhibit high resistivity against wear and tear.

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AISI 4145H MOD Bars


AISI 4145H MOD round bars are engineered for superior strength, toughness, and durability. They are alloy steel that is heat treated and have been known to have a wide range of applications where high strength and good machinability are required.

AISI 4145H MOD Round Bars can be used in multiple industries such as mining, oil & gas, automotive, power generation, and manufacturing. The most common application is in machinery components such as shafts or axles that require tremendous strength and durability. This type of alloy steel is also used in downhole tools where it's necessary to withstand extreme temperatures and pressures.

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What is AISI 4145H MOD?

AISI 4145H MOD grade has two different types of round bars available cold finished bar (CFB) and hot rolled bar (HRB). The cold finished bar has a higher Tensile Strength than the Hot Rolled Bar. Cold Finished Bar also offers superior corrosion resistance compared to HRB because it has higher carbon content which helps protect against corrosion from outside elements. AISI 4130, AISI 4330V MOD and many more grades are also available.

What are the applications of AISI 4145H MOD?

AISI 4145H MOD is primarily used in the oil & gas industry for drilling tools, such as drill collars & heavy-weight drill pipes. It is also used in other applications that require high strength, toughness, & resistance to corrosion & fatigue.

What are the advantages of using AISI 4145H MOD in drilling applications?

AISI 4145H MOD Round Bars have many benefits including their high tensile strength which makes them suitable for heavy-duty applications. 4145H AISI MOD also offer excellent machinability with improved surface finish quality due to their low carbon content which allows for a better cutting performance without sacrificing accuracy or precision during production processes. These 4145H MOD Alloy Steel provide superior fatigue resistance which makes them ideal for long-term use in demanding environments like the oil & gas industry. Different types of products are available, such as Stub Ends,End Caps, etc.

AISI 4145H MOD round bars are highly sought after due to their impressive properties such as strength, durability, machinability, and fatigue resistance. AISI 4145H Alloy Steel Round Bar bars are ideal for applications where demanding conditions prevail like those seen in downhole tools or machinery components that require excellent performance over extended periods. AISI 4145H MOD round bars can be found in a variety of industries ranging from automotive to power generation to oil & gas drilling operations also they offer numerous advantages.

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AISI 4145H MOD Specification

Diameter : 8mm To 800mm

Length : 1000 mm Long To 6000 mm Long

Condition : Cold Drawn & Polished Cold Drawn, Centreless Ground & Polished

Form : Round, Square, Hex (A/F), Rectangle, Wire (Coil Form), Wire-mesh, Billet, Ingot, Forging etc.

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AISI 4145H MOD Chemical Composition

OD Range C Si Mn P S Cr Mo Ni Cu
Up to 10”
Min. 0.42 0.20 0.85 - - 0.90 0.15 - -
Max. 0.49 0.35 1.10 0.025 0.025 1.20 0.35 0.25 0.35
Over 10” Min. 0.42 0.20 1.00 - - 1.00 0.25 - -
Max. 0.49 0.35 1.50 0.025 0.025 1.30 0.35 0.50 0.35

AISI 4145H MOD Mechanical Properties

OD Range Tensile Strength (UTS) Yield Strength (YS) at 0.2% offs Elongation on 2” Min.% Reduction of Area Min.%
Up to 7” exclusive 140 000 Min. psi 965 Min.MPa 120 000 Min. psi 827 14 45
7” and over 140 000 Min. psi 965 Min.MPa 120 000 Min. psi 758 Min.MPa 14 45
Impact Test, ASTM A370, Charpy V notch, Longitudinal, Room Temperature, per batch

Min. Average 40 ft-lb (54 J) with no single value less than 47 J (35 Ft-Lbs)

Impact Test, ASTM A370, Charpy V notch, Longitudinal, Temperature - 4°F (- 20°C), per batch

Min. Average 32 ft-lb (44 J)

Surface Hardness test on each product

Min: 285 HB,Max: 340 HB

Sub-Surface Hardness test per batch

Min: 285 HB,Max: 340 HB

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