AISI 4340 Forged Steel Round Bars

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China main port
Payment Terms:
TT OR LC
Min Order Qty:
30 m.t.
Supply Capability:
10000 m.t./month

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Product Description:

AISI 4340 Forged Steel Round Bars              

Technical Paramenters 

Chemical Composition

Mechanical Properties (In Quenched & Tempered State)

C

0.38-0.43 %

Tensile strength(MPA) 

≥980(100)

Si

0.15-0.35 %

 Yield strength (MPA)

≥835(85)

Mn

0.60-0.80 %

 Elongation (δ5/%)

≥12

Cr

0.70-0.90 %

 Reduction in Area (ψ/%)

≥55

Ni

1.65-2.00 %

 Impact  (J)

 78

P

≤0.035 %

 Impact toughness value αkv (J/cm2)

≥98(10)

S

≤0.040 %

 Hardness 

≤269HB

Mo

0.20-0.30 %



Standard

ASTM A29/A 29M-05 

Grade

4340

MOQ

1 Metric Ton

Diameter

8mm~1500mm

Length

6m,12m or as required.

Diameter Tolerance

As required

Condition of delivery

Hot rolled,Cold Rolled or as required.


Products Show 

 


Product Overviews 

Steel wire, Steel Round bar

Diameter: 0.14mm-2000mm

Steel Square bar
Size 50mm * 50mm-600mm *600mm

Steel Plate(sheet), flat steel bar
Thickness: 0.1mm-800mm  Width10mm to 1900mm

Cold-rolled Plate(sheet)

Thickness: 0.1-8mm   Width1000mm

Hot-rolled Plate(sheet)

Thickness6-200mm  Width 210-1900mm

Surface: 2B, BA, 6K, 8K, 12K, etc.

Welded/seamless Steel Pipe(tube) 
outer diameter: 6-219mm  wall thickness: 1-35 mm.

Length:according to the customer's requirements.

Condition of delivery

Hot-rolling+annealing,normalizing+tempering,quenching+tempering,cold-drawn or according to the customer's requirements.

Surface:rough machining,fine machining,polishing,bright,pickling,black or according to the customers’ requirements.

Furnaces for metallurgical processing  electrode arc + LF,VD,VOD,ESR,Vacuum consumable electrode.

Ultrasonic inspection  100% ultrasonic inspection for any in perfections or according to the customers’ requirements.

All of our steels can be customized(standard GB, ASTM, JIS, DIN, etc.)


Work Shop 

 AISI 4340 Forged Steel Round Bars


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.

 


FAQ

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?

    EXW, FOB, CIF, FFR, CNF

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:Three - grade thread Phi 10 steel can replace a grade Phi 12 round bar? Which elder knows, trouble pointing.
According to the substitution of steel bars, one method, equal strength substitution, equal area substitution and equal root substitution can be obtained by substitution. Three grades of thread Phi 10, steel replaced by a grade Phi 12 of the round steel, I think it may appear: does not meet the minimum reinforcement ratio requirements and reinforcement construction regulations. Don't change it for the best. But must change, must pass the design.
Q:Can I use steel bar instead of steel bar?
The substitution principle of steel bars is equal section substitution and equal strength substitution. Therefore, we can not use round steel instead of thread steel.
Q:What is the difference between a circle and round steel continuous casting
The first two density is not the same, the round billet continuous casting billet is molten steel into round billet crystallizer, after two cold water cooling, solidification formation, density is small; bar is formed by the billet or round billet rolled steel products, good density, better mechanical properties than the same size of billet. Second, round billet is the raw material for steel rolling, and the bar is the final product sold as steel.
Q:12 of the diameter of the round steel can be M12 out of the thread is not
No problem。 M12 coarse thread of the pitch is 1.75, the outer circle to be processed to 11.8mm, the thread of the most beautiful shape. If the outer circle is too large, the tip of the tooth is too small and very easy to deform.
Q:Is round bar steel?
In actual engineering, it is not necessary to use steel bar instead of round steel, but it should not be reversed. In addition, the diameter of the round steel bar is generally not large, but the diameter of the round bar is very large.
Q:Is there a steel bar of 6 diameter on the market?
Reinforced concrete (Rebar) is used for reinforced concrete and prestressed reinforced concrete steel, its cross section is round, sometimes with rounded square.
Q:How many roots are there in a standard ton of steel and how many meters are there in a steel bar?
Generally, the length of steel bars is 6 meters, 9 meters, 12 meters, 6 meters, which is rarely seen on the construction site. A standard bundle is 2 tons.
Q:The diameter of 20 solid round steel bend into a circle, what machine bending?
Gear type steel bar benderStructure: gear type steel bending machine mainly consists of several motors, gear reducer, work mechanism and electrical control system. It changed the traditional worm gear drive, and increased the angle automatic control mechanism and brake device.Operation principle: the gear type steel bar bender is driven by a motor with braking, which drives the working disc to rotate. The two inserting seats on the left and right of the working mechanism can be adjusted by the hand wheel without bending, and can be bent and bent with different specifications of the steel bar. The angle is controlled by several different institutions and primary angle limit pin with each other and realize. When the steel bar is bent to the preselected angle, the limit pin touches the travel switch, causes the motor to stop and reverse, recover to the original position, and complete the bending process of the steel bar. In addition, the electric control system also has the characteristics of inching, automatic state, two-way control, instantaneous braking, emergency stop, rapid system short circuit protection, motor overheat protection, etc..
Q:Could you tell me what is the difference between steel pipe and round steel?
Widely used in the manufacture of structural and mechanical parts, such as oil drilling pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. Making ring parts with steel tubes can improve data application rate, simplify manufacturing process, save data and work hours, such as rolling bearings, rings, Jack sleeves, etc., and have been widely used in steel pipe manufacture.
Q:Is there any technique for welding round steel?
Welding skills:2.1, to determine the best welding position, the group of good welding flat, easy to rotate welding, the weld pool is always in flat position, note the rod angle at 70 degrees.2.2, the welding workpiece in continuous continuous rotation, to control the size of the weld pool at the end of each lap weld slag, cleaned, and then welding together, the thickness of each layer is about 2mm, until the full fill slope has so far.

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