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40CrMnMo Alloy Steel Rod – High-Strength Quenched & Tempered Steel Bar
40CrMnMo Alloy Steel Rod – High-Strength Quenched & Tempered Steel Bar - Image 2
40CrMnMo Alloy Steel Rod – High-Strength Quenched & Tempered Steel Bar - Image 3
40CrMnMo Alloy Steel Rod – High-Strength Quenched & Tempered Steel Bar - Image 4
40CrMnMo Alloy Steel Rod – High-Strength Quenched & Tempered Steel Bar - Image 5

40CrMnMo Alloy Steel Rod – High-Strength Quenched & Tempered Steel Bar

  • 10mm-12000mm
  • ASTM ASME SUS JIS DIN
  • 10MM~400MM
  • Rod / Flat
  • 40CrMnMo A34402 SCM440 AISI 4142 G41420 42CrMo4
  • 30% TT in advance, 70% TT /70% LC at sight balance before shipment
  • support
  • FOB, EXW, CIF, CFR
  • Alloy steel
  • 10 TON
  • Auto Parts

    High-performance 40CrMnMo alloy steel rods featuring excellent strength, toughness, and fatigue resistance. Ideal for making heavy-duty mechanical parts and precision components.

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PRODUCT SPECIFICATIONS

40CrMnMo steel rod is a medium-carbon alloy steel known for its outstanding mechanical properties and wear resistance. Composed mainly of chromium (Cr), manganese (Mn), and molybdenum (Mo), it delivers superior tensile strength, good hardenability, and enhanced toughness after quenching and tempering.

The steel grade is commonly used in applications requiring both surface hardness and internal strength, making it ideal for high-load structural and mechanical parts. With excellent fatigue resistance, this material is suitable for dynamic or impact-heavy environments.

Name 40CrMnMo steel bar & Rod
Material Alloy Steel
Grade AISI 4140/4142, 42CrMo4，SCM440;1.7225
Outer Diameter (OD) 130mm-1000mm
Minimum Order Quantity (MOQ) 5 TON
Single Piece Length 3 meters, 6 meters
Usage Manufacturing/Industrial
Application Structural Steel Bar, Tool Steel Bar, Die Steel Bar
Surface Treatment Coated/Galvanized/Polished
Specification Customized
Origin China foshan
Type Steel Bar
Shape Square/Round

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FEATURES OF 42CRMNMO ALLOY STEEL BAR

 

  • Grade: 40CrMnMo / AISI 4340 Equivalent
  • Standard: GB / ASTM / JIS / DIN equivalents available
  • Heat-treated for high strength (Quenched & Tempered)
  • Excellent mechanical strength and wear resistance
  • High fatigue and impact resistance
  • Good machinability and weldability

40CRMNMO ROUND BAR  OF CHEMICAL COMPOSITION

Element Composition (%)
Carbon (C) 0.38 to 0.45%
Silicon (Si) 0.17 to 0.37%
Manganese (Mn) 0.90 to 1.20%
Phosphorus (P) ≤0.035%
Sulfur (S) ≤0.035%
Chromium (Cr) 0.90-1.20%
Nickel (Ni) ≤0.30%
Copper (Cu) ≤0.30%
MO 0.2  to 0.3

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40CRMNMO ROUND BAR OF STANDARD

China Japan Korea USA ISO Germany Russia UK
GB ISC JIS KS ASTM/AISI UNS DIN EN/DIN W-Nr. GOST BS EN/BS
40CrMnMo A34402 SCM440 SCM440 4142/4140 G41420 42CrMo4 42CrMo4 1.7225 40XTM 708A42

APPLICATION

 

40CrMnMo steel rods are widely used in heavy-duty engineering and automotive industries, especially for parts subject to high stress, wear, and fatigue. Typical applications include:

  • Automotive transmission shafts and axles
  • Gear shafts and crankshafts
  • Aircraft landing gear and structural components
  • Forged and machined parts under dynamic loads
  • Mining and heavy machinery parts
  • High-stress bolt and fastener production

This steel grade is ideal for precision-machined parts that require both high surface strength and reliable core toughness.