SAE 4145 Steel Round Bar Diameter 10 - 350mm Hot Rolled Cold Rolled
Steel Bars ASTM A29
Products Specification
| Products Name | SAE4145 Alloy Steel Round Bar |
| Diameter | 10 - 350 mm |
| Length | 6m or custom cutting any length as request |
| Type | Hot Rolled |
| Brand | BAOSTEEL DELTA DONGBEI HUAXI SHAGANG.etc |
| MOQ | 1 Ton |
| Loading Port | Shanghai Port |
| Packing | packing by steel wire rope |
| Deliver time | 5 - 7 days for stock materials |
| Other Grade | Q195,Q235,10#,20#,35#,45#,Q215,Q345,12Cr1Mov,15CrMo,304,3 16,20Cr,40Cr,20CrMo,35CrMo,42CrMo,40CrNiMo,GCr15,65Mn,50Mn, 50Cr,3Cr2W8V,20CrMnTi,5CrMnMo |
| Standard | ASTM GB EN DIN |
| Application | Structure and Industrial |
Regular Standard Size of our Round Bar in Stock
| Standard Diameter | 10 12 15 18 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105
110 120 130 140 150 160 180 200 210 220 230 250 270 300 |
About 4145 Steel Round Bar
4145 is a low alloy chromium molybdenum steel similar to 4140 but
with amended analysis which contributes towards its increased
hardenability at larger diameters. 4145 steel bars are popular in
larger diameters due to this increased strength and hardenability.
4145 alloy steel can be easily forged, machined and welded. It can
also be heat treated to a wide range of strength and ductility
levels. This forged bar stock is used in many oil and gas
application including as forged down-hole drilling tools.
AISI 4145 Composition
AISI 4145 is a low-alloy steel grade containing 0.45% carbon, 0.75%
manganese, 1.00% chromium, 0.20% molybdenum, and 0.15% vanadium.
The alloying elements enhance their mechanical and physical
properties, such as strength and toughness. Additionally, the
alloy’s controlled composition enables it to be quenched and
tempered to improve its hardness and wear resistance.
| Element | Content (%) |
|---|
| Iron, Fe | 96.795-97.72 |
| Chromium, Cr | 0.800-1.10 |
| Manganese, Mn | 0.750-1.00 |
| Carbon, C | 0.430-0.480 |
| Molybdenum, Mo | 0.150-0.250 |
| Silicon, Si | 0.150-0.300 |
| Sulfur, S | ≤ 0.0400 |
| Phosphorous, P | ≤ 0.0350 |
AISI 4145 Mechanical Properties
AISI 4145 exhibits excellent strength, toughness, and wear
resistance as a low-alloy steel grade. The minimum yield strength
of AISI 4145 is 89 KSI, while the ultimate tensile strength is
between 125-140 KSI, depending on the heat treatment conditions.
The alloy’s high toughness and fatigue resistance make it an ideal
choice for manufacturing critical components, including drill
collars and heavy-duty shafts.
AISI 4145 Physical Properties
AISI 4145 has a density of 7.85 g/cm3 and a melting point of 1424°C
(2580°F). Its coefficient of thermal expansion is 11.2 µm/mK and
has a thermal conductivity of 42.6 W/mK. The alloy’s physical
properties remain stable within a broad temperature range, making
it an ideal choice for high-temperature applications.
| Properties | Metric | Imperial |
|---|
| Density | 7.85 g/cm3 | 0.284 lb/in³ |
AISI 4145 Equivalents
| ASTM A29 | ASTM A322 | ASTM A331 | ASTM A519 | ASTMA711 |
| ASTM A752 | ASTM A829 | SAE J1397 | SAE J404 | SAE J412 |
| ASTM A505 | SAE J770 | MIL SPEC MIL-S-16974 |
AISI 4145 Uses
AISI 4145 finds application in various heavy-duty and high-stress
applications. In the energy sector, it is used for manufacturing
drilling tools, pump shafts, and other components used in
exploration and production activities. It also finds extensive use
in the aerospace and defence sectors for manufacturing gears,
shafts, and other critical components. Its excellent corrosion
resistance and strength make it an ideal choice for
seawater-drenched components, including marine motor shafts and
other offshore applications.
AISI 4145 Heat Treatment
AISI 4145 can be subjected to various heat treatment processes to
modify its mechanical and physical properties. The most common form
of heat treatment for AISI 4145 is quenching and tempering, which
involves heating the steel to a temperature of 927°C (1700°F) and
cooling it rapidly in a quenching medium such as water, oil or air.
The steel is then tempered to refine its mechanical properties.
AISI 4145 Machining
AISI 4145 is a moderately difficult steel machine that can be
machined successfully using the right equipment and techniques. The
alloy’s moderate hardness and toughness require high cutting
forces, and sharp cutting tools and minimum chip loads are
necessary to avoid tool wear and premature failure. Cutting fluids
is highly recommended to prevent overheating and prolong tool life.
AISI 4145 Welding
AISI 4145 is an alloy steel that is commonly used for welding
components. Its hardenability and wear resistance suit various
applications, including heavy machinery, construction and
automotive parts. Additionally, its high-strength properties allow
for higher performance in challenging conditions when compared to
other steels.
