DIN1.7225 Alloy Structural Steel Rod 4140 Special Steel

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Loading Port:
China main port
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Min Order Qty:
25 m.t.
Supply Capability:
10000 m.t./month

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Item specifice:

Type: Alloy Steel Shape: Steel Wire Rod Standard: AISI,ASTM,JIS,GB,BS,DIN,API,EN
Technique: Hot Rolled,Cold Rolled,Cold Drawn,ERW,Forged,Saw,Extruded,EFW,Spring Shape: U Channel,Square,C Channel,Hexagonal,Round,Rectangular,Oval,LTZ Surface Treatment: Galvanized,Coated,Copper Coated,Color Coated,Oiled,Dry,Chromed Passivation,Polished,Bright,Black,PVDF Coated
Steel Grade: Q195,Q215,Q235,Q215B,Q235B,RHB335,HRB400,200 Series,300 Series,400 Series,600 Series,SS400-SS490,10#,20#,A53(A,B) Certification: ISO,SGS,BV,IBR,RoHS,CE,API,BSI,UL Net Weight: as required
Length: as required Thickness: as required

Product Description:

The details of our Steel

1. Produce Standard: as the GB, AISI, ASTM, SAE, EN, BS, DIN, JIS Industry Standard


2. Produce processes: Smelt Iron -EAF smelt Billet  - ESR smelt Billet -Hot rolled or forged get the  steel round bar and  plate


3. Heat treatment:

Normalized / Annealed / Quenched+Tempered


4. Quality assurance:

All order we can received  Third party inspection, You can let SGS, BV,.. and others test company test and inspect our products before Goods shipping.

Product information

Chemical Composition(%) of 4140 round steel















Specification of 4140 round steel

Hot Rolled: Dia.(mm)*L(mm)=14-200*2000-6000

Forged: Dia.(mm)*L(mm)=210-800*2000-6000

Application of 4140 round steel

(1) Commonly used for manufacturing 35CrMo higher than the required strength, large parts of the important sectional dimensions, such as axis, gear, connecting rod, transmission gears, the supercharger gear, engine cylinder, spring, spring clamps, 12-2000mm oil pipe fittings, fishing tools and instead of containing nickel steel high.

(2) For main shaft of steamer,boly for 400 °C. Hummar shank.

Characteristic of 4140 round steel

(1) Chromium molybdenum high tensile steel with yield strength of 550N/mm2.

(2) Chromium renders steel oil hardenable and increase hardenability.

(3) Weldability suffers with increasing chromium content.

(4) High temperature strength and high pressure hydrogenation properties are promoted by chromium and molybdenum.

(5) Molybdenum significantly reduces temper brittleness.

Heat Treatment of 4140 round steel



Subcritical Annealing:680~720°C     Isothermal Annealing:830~900 670x3h°C Hardening:830~860 oil


Mechanical Properties of 4140 round steel

Tensile str. (N/mm2):1080

Yield point (N/mm2):930

Elongation (%):12

Contraction (%):45

Impack work (J/cm2):63

Hardness (HB):217  

Delivery Condition of 4140 round steel

hot rolled, black surface, annealed

Payment Term of 4140 round steel

L/C at sight,T/T,30% in advance,70% before the shipment

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DIN1.7225 Alloy Structural Steel Rod 4140 Special Steel

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