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ASTM 4140 JIS SM440 DIN 42CrMo4 Alloy Solid Round Carbon Steel Bar Rod

The ASTM A322 4140 round bar (also known as AISI 4140) is a versatile chromium-molybdenum alloy steel known for its high strength, toughness, and wear resistance. Below are its key specifications, properties, and applications:
ASTM 4140 Steel Overview
Material Type: Alloy steel (Cr-Mo)
Standard: ASTM A322 (for alloy steel bars)
Composition (Typical):
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): 0.15–0.30%
Round Bar Specifications
Shape: Solid round bars
Diameter Range:
Hot-Rolled: 5mm – 300mm+
Cold-Finished (Precision Ground): 3mm – 150mm
Length: Standard (3m, 6m) or custom-cut
Surface Finish:
Hot-Rolled: Black oxide, rough surface
Cold-Drawn: Smoother, tighter tolerances (±0.1mm)
Polished/Turned: For precision machining
Key Applications
High-stress components (axles, shafts, gears)
Oil & gas equipment (drill collars, valves)
Aerospace & defense (landing gear, bolts)
Tooling & dies (molds, hydraulic rams)
Automotive (crankshafts, suspension parts)

Product Description

roduct Name	Carbon Steel Round Bar
Diameter	5.5 - 250 mm, or according to customer's requirement
Length	1 - 6 m, or according to customer's requirement
Material	SAE1020,SAE1045 ,SAE4140,20Cr-40Cr, 20Mn-65Mn, 15CrMo-42CrMo, 20Mn2-40Mn2, Q195-Q345 S235JR S275JR S355JR S355K2 A36 SS400 Q235 Q355 C45 ST37 ST52 4140 4130 4330 Q15 Q215A Q215B Q235A Q235B Q235C Q235D Q275 Q275B Q275C Q275D Q25 Q345 Q30 Q420 Q460 SS330 SS440 SS540 A36 1 GR.36 50(245) 55(380) 42(20) 60(415) 65(450)
Surface	Black, bright, oiled, painting, anti-corrosion coating
Technique	Hot rolling , cold drawing , hot forging
Standard	GB, ASTM, AISI, JIS, BS, DIN, EN
Usage	Automotive engine or conveying
Package	In bundle with steel strip and packed in wooden pallets or as customers' requirement.

Mechanical properties

‌Tensile strength‌: 410~570 MPa ‌

‌Yield strength‌: ≥245 MPa (hot rolled) ‌

‌Elongation‌: ≥25% ‌

‌Hardness‌: ≤156 HB when untreated ‌

Core characteristics

‌Processing performance‌: cold heading/stamping pass rate>99%, surface hardness after carburizing can reach HRC 58~62 ‌

‌Welding performance‌: supports arc welding and gas shielded welding, requires preheating 150~200°C before welding ‌

‌Limitations‌: poor wear resistance when untreated, surface protection is required in humid environments ‌

Application scenarios

Mainly used in automotive transmission shafts, steering components, mechanical parts (gears, bearings, etc.), light-load connectors in building structures, etc.

Company Profile

Shandong Zhonglian Yongsheng Special Steel Co., Ltd. is a steel production enterprise that has been engaged in steel production, processing and sales for many years. Its main products include stainless steel series, carbon steel, galvanized steel and other profile products. It can also provide other metal products according to customer needs, with an annual export volume of about 1 million tons. It has five finishing production lines, three hot-dip galvanizing production lines, and two color coating production lines. It adopts advanced automatic width control system (AWC), automatic thickness control system (AGC), bending roll system, work roll guide roll system and other effective measures to ensure product quality. Its products are exported to more than 30 countries and regions including the United States, Canada, Spain, Russia, Iran, Saudi Arabia, Morocco, India, Pakistan, Malaysia, Singapore, Australia, New Zealand, etc. "Punctuality, integrity, and humanized service" have always been the development principles that the company and all employees have always adhered to.

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