AISI 4140 4130 Solid Carbon Alloy Round Steel Bar
Product Description
AISI 4140
High-Tensile Alloy Steel Round bar 4140 Hot Rolled Steel
Grade: AISI 4140, 4130, 5140, 5120
Alloy structural steel: 4140
Executive standard: ASTM A29/A29M-04 4140 steel. This steel has good workability, small processing deformation, and good fatigue resistance. It is a medium hardenable steel. After heat treatment, 4140 has good strength and good comprehensive mechanical properties, good manufacturability, and yield high.
The highest service temperature is 427 degrees Celsius, 4140 strength, hardenability, good toughness, small deformation during quenching, high creep strength and enduring strength at high temperature.
It is used to manufacture forgings that require higher strength and larger quenched and tempered section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, connecting rods and spring clips that are heavily loaded, and can also be used Drill pipe joints and fishing tools for oil deep wells below 2000m, and can be used for molds of bending machines.
Product name | steel round bar | |
Size | O.D | 8-480mm |
Length | 1-12m | |
Standard | AISI,ASTM,GB,DIN,BS,JIS | |
Grade | AISI 4140, 4130, 5140, 5120 | |
Inspection | X-ray inspection, manual ultrasopic inspection,surface inspection,hydraulic testing | |
Technique | Hot Rolled | |
Section Shape | Round | |
Main Market | Southeast Asia, Middle East, Australia,USA,South America,Africa | |
Productivity | 5000 Tons/month | |
Packing | Standard bundle package Beveled end or as per request | |
Surface Treatment | Black Painted or Customized all available | |
Date of Delivery | According to The Specifications And the Quantities Of Each Contract, | |
Method of Payment | T/T L/C | |
Method Of Delivery | Terms According To the <INCOTERMS 2000> for International Trading | |
Remarks | 1.Payment Terms T/T, L/C | |
2.Trade Term:FOB/CFR/CIF | ||
3.Minimum Quantity of Order: 2 Tons | ||
4.Delivery Time:7-15 days after receipt of deposit | ||


1.What are the 4 types of steel?
The four main types of steel include carbon steel, stainless steel, alloy steel, and tool steel. Learn how the different kinds of steel are categorized and how each type can work for your project requirements.
2.What is a round bar steel?
Round bar is a steel bar with a smooth surface which is used for construction that does not request high-strength reinforced concrete works. It is widely used on beam and column stirrups, pipelines, roads, small and medium-sized projects.
3.What is the difference between round bar and steel rod?
Round bars are typically made from hot-rolled steel, while rods usually come from cold-drawn steel. Round bars have a higher carbon content than rods, which gives them better strength and hardness properties. Rods have a higher manganese content than round bars, which gives them better wear resistance.
4.What is round stock metal?
Round Bar is a cylindrical metal bar with a circular cross-section. It is one of the most common and versatile forms of metal stock, used in various applications across different industries.
5.What is 3 grade steel?
Grade 3 is a super-high strength steel for powertrain and transmission components such as gears, crankshafts, camshafts, axle shafts, connecting rods, etc.



















