High Strength Steel Round Bar 4140 Round Bar Steel

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China main port
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30 m.t.
Supply Capability:
10000 m.t./month

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Product Description:

High Strength Steel Round Bar 4140 Round Bar Steel                                       

Products Details 

Steel, High Strength Steel Round Bar, 4140 Round Bar Steel 
1. Annealed/Q+T 
2. Sample free 
3. Black 
4. Quality assurance

1,Size of 4140 Carbon Alloy Steel

Round bar


Length (mm)





Width (mm)  

Length (mm)   




The specification can be customized.

 2,Chemical Compositons






































3,Features of 4140 alloy steel

1, Chromium molybdenum alloy steel 

2, Slightly higher carbon content then 4130

3, Greater strength and heat treatment 

4,Typical Applications 

1, Applications in the oil and gas sector

2, Connection rods, collets, conveyor pins, 

3, Gears, stem assemblies, 

4, Pump shafts and tool holders

Main Products

Alloy Steel



Tool Steel



Bearing Steel


Spring Steel



Stainless Steel



Products Show 



Carbon Steel

 Mold bottom,   Plastic mold,   Construction machinery parts

 Automobile parts,   Security grills,   Screens,  Construction

 Bearing Steel  Aerospace,   Navigation,   Nuclear energy,   Chemical industry

 Electronic information,   Petrochemical,   Instrument and meter


 Cr-Mo Steel  Mechanism & Fasteners gear,    Stressed components for vehicles 

 Engines and machines,    Parts of larger cross-section


Gear Steel

All kinds of gears,   Statically and dynamically stressed component for vehicles

Engines and machine,   Larger cross-section parts,   Crankshafts 

Work Shop 

 High Strength Steel Round Bar 4140 Round Bar Steel

Company Information 

CNBM International Corporation is the most important trading platform of CNBM group.

Whith its advantages, CNBM International are mainly concentrate on Cement, Glass, Iron and Steel, Ceramics industries and devotes herself for supplying high qulity series of refractories as well as technical consultancies and logistics solutions.



1, Your advantages?

     professional products inquiry, products knowledge train (for agents), smooth goods delivery, excellent customer solution proposale

2, Test & Certificate?

      SGS test is available, customer inspection before shipping is welcome, third party inspection is no problem

3,  Factory or Trading Company?

      CNBM is a trading company but we have so many protocol factories and CNBM works as a trading department of these factories. Also CNBM is the holding company of many factories.

4, Payment Terms?

    30% TT as deposit and 70% before delivery.

    Irrevocable L/C at sight.

5, Trading Terms?


6, After-sale Service?

     CNBM provides the services and support you need for every step of our cooperation. We're the business partner you can trust.

     For any problem, please kindly contact us at any your convenient time.

We'll reply you in our first priority within 24 hours.

Packaging & Delivery

1, Packaging: seaworthy package or as required 

2, Delivery: 35-45 days or based on quantity

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Q:The diameter of 20 solid round steel bend into a circle, what machine bending?
Hydraulic steel bar cutting and bending machineThe hydraulic steel bar cutting and bending machine is a dual-purpose machine which uses hydraulic technology to cut and bend steel bars. It has high automation and convenient operation.Structure: hydraulic type steel bar cutting and bending machine mainly consists of hydraulic transmission system, cutting mechanism, stubborn mechanism, engine, airframe and so on.Working principle: an electric motor drives two sets of plunger hydraulic pumps, one group pushes off the piston, and the other drives the rotary hydraulic cylinder to drive the rotary working disc to rotate.Cut off the working principle of mechanism in cutting piston is arranged in the middle column and the center of the valve spring, in turn, due to the action of the spring, the middle hole make the center column left valve hydraulic cylinder, high pressure oil is also from the eccentric shaft road to tank. In the cut, a human powered piston, the center hole center column valve blocked the hydraulic cylinder, the plunger pump to the hydraulic cylinder through high pressure oil into the oil valve, high pressure to push the piston movement, the piston drives the cutter to cut tendons. At this point, the thrust of the pressure spring is greater than the pressure in the hydraulic cylinder, the valve will return to its original position, and the hydraulic oil will flow along the oil channel of the central oil hole back into the tank. The return stroke of the piston is achieved by the rebound force of the plate spring.
Q:How can I connect channel steel and round steel?
The connection of channel steel and round steel is done by welding, and the strength of the screw connection is not enough.
Q:40CrMo what is the round steel material?
High strength, high hardenability, good toughness, little deformation during quenching and high creep strength and lasting strength at high temperature.
Q:What's the difference between pure iron round steel and electromagnetic pure iron bar?
It's another matter! So to sum up, the two are in principle a kind of thing! However, some of the small partners who are strong in pure iron are accustomed to using "round bar" to indicate some big caliber specifications. "Bar material" is used to indicate the specifications of small caliber.
Q:What are the scientific names of round bar and screw steel?
Round steel: round steel refers to the cross section of round solid steel. Mainly used in manufacturing machine, stainless steel round bar, mechanical parts, seamless steel pipe blank
Q:What's the difference between Q345 round steel and No. 45 round steel material?
Q345: it is a kind of manganese steel (16Mn), yielding strength of 345, good welding performance, commonly used in structural parts welding, low carbon steel, can not be used for quenching or quenching and tempering.No. 45 Steel: high quality carbon structural steel, medium carbon steel. Can be used for quenching or tempering.
Q:What kind of steel is used for anchor bolt material? What's the quality of anchor bolt material?
When the mechanical component is installed on the concrete foundation, one end of the bolt is J and L shaped, and is embedded into the concrete.
Q:Is round steel bar round steel?
NoRound steel bars refer to hot rolled round steel bars for reinforced concrete. Round bars include high-quality carbon structural steel, round steel, ordinary carbon structural steel round bars, steel bars for prestressed concrete, etc.. Although the shape is round, but the material is different, so steel and round bar is two yards.
Q:How is the copper wire and galvanized round steel connected during the construction of the lightning protection device?
Generally, the lightning protection devices of buildings are divided into two major categories: external lightning protection devices and internal lightning protection devices. The external lightning protection device consists of a lightning receiver, a lead off line and a grounding device, namely the traditional lightning protection device. Internal lightning protection device is mainly used to reduce the lightning current inside the building and electromagnetic effects, such as the use of electromagnetic shielding, equipotential connection and installation of surge protection device (SPD) and other measures to prevent the harm caused by lightning electromagnetic pulse.
Q:Do you need paint for roof lightning proof steel bars?
If the metal surface is coated with a thick layer of insulating paint, it will seriously affect the flashover effect. In the national standard, the metal roof is directly used as a flash receiver. The thickness of the paint used on the roof must be less than the required value. That is what it means.

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