42CrMo4 4140 Alloy Steel Round Bar, Quenched & Tempered Forged Chrome Moly Steel Bar for Industrial Machinery

Product Description

AISI Hot Rolled 4140 42CrMo 42CrMo4 Alloy Steel Bars: High-Strength Solutions for Industrial Machinery Diameter 2-1000mm Hardenability 4130 Iron Rod Factory

Product Description

AISI SA4140 steel is a low-alloy, medium-carbon chromium-molybdenum steel known for its excellent strength, toughness, and hardenability. When formed into rods, it becomes a versatile material widely used in industrial and engineering applications.
Chemical Composition (Typical, % by Weight)
Carbon (C): 0.38 - 0.43%
Chromium (Cr): 0.80 - 1.10%
Molybdenum (Mo): 0.15 - 0.25%
Manganese (Mn): 0.75 - 1.00%
Silicon (Si): 0.15 - 0.35%
Phosphorus (P): Maximum 0.035%
Sulfur (S): Maximum 0.040%
Mechanical Properties (Annealed and Heat-Treated)

Property	Annealed Condition	Heat-Treated (Tempered)
Tensile Strength	655 - 795 MPa (95,000 - 115,000 psi)	1,035 - 1,380 MPa (150,000 - 200,000 psi)
Yield Strength	415 MPa (60,000 psi) minimum	860 MPa (125,000 psi) minimum
Elongation (in 50 mm)	25% minimum	12 - 18%
Hardness (Brinell)	197 maximum	28 - 32 HRC (typical)
Modulus of Elasticity	~200 GPa (29,000 ksi)	~200 GPa (29,000 ksi)
Density	7.85 g/cm³ (0.284 lb/in³)	7.85 g/cm³ (0.284 lb/in³)

Key Characteristics
Hardenability: Responds well to heat treatment (quenching and tempering), allowing for customization of strength and toughness.
Weldability: Can be welded using most methods, though preheating and post-weld annealing are recommended to prevent cracking.
Machinability: Good in the annealed state; becomes more challenging after heat treatment due to increased hardness.
Wear Resistance: Excellent when heat-treated, making it suitable for high-stress, abrasive environments.
Common Applications of 4140 Steel Rods
Automotive parts (axles, crankshafts, gears)
Industrial machinery components (shafts, bolts, studs)
Oil and gas equipment (drill collars, connectors)
Tooling and die components
Structural parts requiring high strength-to-weight ratios
4140 steel rods are valued for their balance of strength, ductility, and cost-effectiveness, making them a go-to material for demanding engineering applications.

Prdouct Name	Carbon Steel Bar
Shape	Round,Square,Flat,Rectangle,etc.
Material	Carbon steel :Q195-Q420 Series,SS400-SS540 Series,S235JR-S355JR Series,ST Series,A36-A992 Series,Gr50 Series,etc.
Surface	Mild steel plain finish, hot dip galvanized, color coated, ect.
Size Tolerance	±3%
Processing method	Bending, Welding, Decoiling, Cutting, Punching, Polishing or as customer's request
Size	OD from 10 - 400mm, length from 1m-12m or according to customer's special request
Technology	Hot roll, cold roll, cold drawn, ect.
Trade Term	FOB,CIF,CFR,EXW,etc.
Price Term	T/T,L/C,Western Union,Paypal,Apple Pay,Google Pay,D/A,D/P,MoneyGram
Lead time	Small batch can be in 7 days, depending on the quantity
Certificate	ISO9001

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FAQ

Q1: Why choose us?
A: Our company, as an internationally experienced and professionalsupplier, has been engaged in steel business for more than ten years. Wecan provide a variety of steel products with high quality to our clients.

Q2: Can you provide OEM/ODM service?
A: Yes. Please feel free to contact us for more details

Q3:What is your terms of payment?
A: 100% T/T advance.
30% T/T and balance against copy of documents.
30% T/T advance, balance L/C at sight.

Q4: Can we visit your factory?
A: Warmly welcome. Once we have your schedule, we will arrange theprofessional sales team to follow up your case.

Q5: Can you provide sample?
A: Yes. Sample is free for regular sizes, but the buyer needs to pay freightcost.

Q6: How long is your delivery time?
A: Regular lead time is 15 to 30 days after receiving deposit.