AISI 4340 Forged Round Steel Bars

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30 m.t.
Supply Capability:
10000 m.t./month

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Product Description:

AISI 4340 Forged Round Steel Bars                 

                       

Products Details 

aisi 4340 forged steel round bars
Comparative standardGradeCSiMnCrMoVWPSNi
GB40CrNiMoA0.36-0.440.10-0.3500.45-0.701.10-1.400.20-0.35

0.030.021.30-1.7
AISI4337/4340









JISSNCM8









DIN34CrNiMo6/1.65820.34max 0.400.651.500.23

0.030.031.50
Dimensions
Round bar
Dia:10mm~700mmLength:2m~6m
Flat bar
Thickness:10mm~500mmLength:2m~12m
*Dimensions can be customized
Heat Treatment
Normalizing850-880°C-
Stress Relieving650°Cair cooling
Quenching830-860°Coil quenching
Tempering540-660°C
1.Normalizing
Normalizing temperature : 850-880°C

2.Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to approx.650°C,
holding for 1-2 hours at heat,followed by air cooling .
This operation is performed to reduce distortion during heat treatment .

3.Hardening
Harden from a temperature of 830-860°C followed by oil quenching.
Quenching temperature in the end quench test is 850°C.

4.Tempering
tempering temperature: 540-660°C

Detail information
ProcessEAF+LF+VD+Forging+(Rolling)+Annealing Condition (optional)
Delivery ConditionHot forged+Rough machined/turned surface
MOQ1 ton
Technical DataAccording to customer’s requirements of chemical composition, physical properties and mechanical testing
Ultrasonic TestUltrasonic test according to SEP 1921-84   G3 D/d E/d
Applications
Hot extrusion dies, forging die forging hammer, forging press die, precision forging die well as aluminum, copper and alloys die-casting mold.
Relevant documents
Contract DocumentsContract, Debit Note, PI(Performa Invoice)
Shipping DocumentsB/L(Bill of Loading), Packing List, Shipping list, CI(Commercial Invoice)
CertificationsSGS, ISO9001-2008, UT(Ultrasonic Test), CO(Certificate of Original), MTC(Milling Test Certificate)

 

Products Show 

 


Product Overviews 

Product NameTypical GradesDiameter(mm)Standard adopted
Carbon Steel20 (1020/S20C/C22)Ø16-Ø300

 

 

GB/SAE/JIS/DIN

 

40 (1040/S40C/C40)
45 (1045/S45C/C45)
Bearing SteelGCr9 (51100/SUJ1)Ø12-Ø250
GCr15 (52100/SUJ2/100Gr6)
GCr9SiMn (A485-Gr.1/SUJ3)

 

Cr-Mo Steel

20Cr (5120/SCr420H/20Cr4)Ø12-Ø250
40Cr (5140/SCr440/41Cr4)
42CrMo(4140/SCM440/42CrMo4)
Gear Steel20CrNiMoØ16-Ø600
20CrMn(5115/SMnC420/20MnCr5)
20CrNiMo(8620/SNCM220/20CrMiMo2)


Application 

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

 Transportation 

 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 

 AISI 4340 Forged Round Steel 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:What is the difference between the heat treatment of cold drawn round steel and the heat treatment of wrought round steel?
Normalizing: heating steel or steel parts to the critical point, AC3 or ACM above the appropriate temperature, after a certain period of time in the air cooling, pearlite structure of the heat treatment process.
Q:The 8 thread can replace the beam stirrups by steel
First class steel is HPB235, that is, yield strength is 235mpa, elongation of grade steel is much larger than grade two steel, and the scientific name of grade two steel is HRB335, that is, yield strength is 335mpa, and grade two steel is higher than first grade steel. But also a high level of brittle than steel, as in seismic zone two structure beam is not replaced.
Q:How do you know the diameter and weight of a round bar?
The weight / weight / length is /3.14, and then the more is the radius. Then *2 is the diameter.Formula: pi * (D/2) - *L* weight = weight
Q:How many positive and negative tolerances are allowed for round steel GB?
Round steel is a solid strip of steel whose cross section is round. The specifications are expressed in millimeters of diameter, such as "50", which means a round bar of 50 millimeters in diameter. Round bar is divided into three parts: hot rolling, forging and cold drawing. Standard Specification for hot rolled round steel is 5.5-250 mm. Among them, 5.5-25 mm small round bars are mostly supplied by straight strips. They are used as reinforcing bars, bolts and various mechanical parts. They are more than 25 millimeters of round steel. They are mainly used in the manufacture of mechanical parts or seamless steel tube billets
Q:Round bars and ribbed stirrups are much better
Hot rolled ribbed steel bar with high strength, suitable for large component high-rise buildings under gravity loads, but also because of its surface shape can provide grip and end without hook, the corresponding anchorage length is short, the material.
Q:What is the mechanical properties of No. 40 round bar?
40# stands for steel grades, round bars for steel profiles, mechanical properties for steels, tensile strength, yield point, (cattle / mm, 2) elongation, shrinkage (%), impact energy, Ak (coke), state, hardness, HB<
Q:Weight algorithm of round steel
Round steel weight = density * volume = density * base area * length of round bar.Round steel is a solid strip of steel whose cross section is round. Its specifications are expressed in diameter, in units of millimeters (mm), such as "50mm", which means a diameter of 50 millimeters of round steel.
Q:Difference between cold drawn round steel and round steel
Cold formed steel allows partial buckling of the cross section, thus taking full advantage of the post buckling capacity of the member, while the hot-rolled section does not allow partial buckling of the cross section.
Q:Are lightning checks required for galvanized steel, flat steel and round steel?
No, when purchasing hot galvanized round steel and flat steel, please offer the factory certificate and inspection certificate.
Q:Special steel bar steel products used to do what
But the red hardness difference of this kind of steel, that is, when the working temperature is greater than 250 degrees, the hardness and wear resistance of steel will decline rapidly, and lose their ability to work. In addition, carbon tool steels, such as those made of larger parts, are difficult to harden and easy to produce

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