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Quick Details

  • Steel Grade: alloy round
  • Standard: AISI, ASTM, DIN, JIS
  • Dimensions: dia 10-350mm * length 2000-13000mm
  • Place of Origin: China (Mainland)
  • Brand Name: Unite
  • Model Number: 4140
  • Technique: Hot Rolled
  • Application: Structural Steel Bar
  • Alloy Or Not: Is Alloy
  • Type: Alloy Steel Bar
  • Process: EAF+LF+VOD+Rolled +Heat Treatment(optional)
  • Ultrasonic test: according to SEP 1921-84
  • Usage: Mechanical
  • Material: Alloy steel
  • Inspection: The third party is acceptable
  • Surface: Black, bright
  • Keyword: Round Bar Steel

Packaging & Delivery

Packaging Details standard seaworthy packing or as customer required
Delivery Time Within 5- 30 days

4140 Round Bar Steel With Heat Treatment




It is the most commonly used of the high tensile steels with a wide range of applications in automotive, Gear and Engine construction, Crankshafts, Steering knuckles, Connecting rods, Spindles, Intermediate gears, Pump and Gear shafts, Axles, Nuts and Bolts, bearing, gear, transmission gear, supercharger gear, engine cylinder, spring, 1500mm-2000mm rotary shouldered connections for petroleum industry, jar knocker.



Australia      AS 1444-2007 4140

             AMS 6378, AMS 6379 , AMS 6381B , AMS 6382 , AMS 6382G , AMS 6390 , AMS 6390A , AMS 6395

Germany      DIN 17212 W.Nr. 1.7223 Type 41CrMo4

DIN 17200 1654 W.Nr 1.7225 Type 42CrMo4

DIN 17200 W.Nr 1.7227 Type CrMoS4

              EN10083 11991 1.7225 42CrMo4

Great Britain   BS970 1955 EN19A

             BS970 Part 3:1991708M40 or 709M40 or 708 A 42

Sweden:       SS 2244

France        AFNOR 40 CD 4 , AFNOR 42 CD 4

Italy:          UNI 38 CrMo 4 KB , UNI 40 CrMo 4 , UNI G 40 CrMo 4

USA         ASTM A29A29M91 4140

ASTM A322 4140

ASTM A331 4140 cold finish

SAE 4140, SAE J404 , SAE J412 , SAE J770 , UNS G41400

ASTM A331 , ASTM A505 , ASTM A519 , ASTM A547 , ASTM A646 ,


Japan        JIS G 4103 SNCM4

JIS G 4105 SCM4

JIS G 4105 SCM440


Chemical requirements:



Mechanical Properties:

Steel grade

Tensile strength


Yield strength






Outer Diameter: 10-350 mm

Length Random Length, Fixed Length, etc.



In bundle or as your request.

Product Description



Packaging & Shipping


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Company Information


Our Services

Third Party inspection acceptable. such as SGS, BV etc.

Supplying financial support with usance L/C 180 days after B/L date.


Please feel free to contact us again if you have any further questions. We look forward to receiving an order from you.


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