42CrMo 4140 42CrMo4(1.7225) Structural Alloy Steel Bar GB ASTM EN

Excellent high hardenability, outstanding toughness and fatigue‑resistance performance
Cross‑standard equivalent grades: GB 42CrMo, ASTM 4140, EN 42CrMo4(1.7225) for global substitution
Multiple shapes & multiple heat‑treatment status for heavy‑load mechanical parts
Low internal stress after quenched & tempered, stable long‑time service performance
Suitable for wind‑power, oil‑field and heavy‑engineering procurement

Product Overview

42CrMo / ASTM A322 4140 / EN 42CrMo4(1.7225) belongs to Cr‑Mo series high‑toughness structural alloy steel bar, produced according to GB/T3077, ASTM A322, EN 10263 standards. This material owns high hardenability, good high‑temperature strength, great fatigue resistance, widely used for heavy‑load rotating components.

Available shapes: round bar, square bar, hexagonal bar and flat bar. Round bar Φ10‑350mm; square bar 10‑200mm; hex bar S10‑S100. Available delivery conditions: hot‑rolled annealed for forging blanks; cold‑drawn precision bar for tight tolerance machining; quenched & tempered pre‑hardened bar for direct manufacturing.

Main application: crankshaft, wind‑power main shaft blank, heavy‑duty gear, hydraulic cylinder piston rod, mining heavy‑load bolt, oil‑field mechanical parts.

Structural Alloy Steel Bar

Chemical & Mechanical Property Snapshot

Grade	Equivalent Standard	C(%)	Si(%)	Mn(%)	Cr(%)	Mo(%)	Yield Strength Min(MPa)	Tensile Strength Min(MPa)	Elongation A5 Min(%)	Key Characteristic
42CrMo	GB/T3077	0.38‑0.45	0.17‑0.37	0.50‑0.80	0.90‑1.20	0.15‑0.25	930	1080	12	High strength & toughness, suitable for heavy‑load shafts
4140	ASTM A322	0.38‑0.43	0.15‑0.35	0.75‑1.00	0.80‑1.10	0.15‑0.25	930	1080	12	US equivalent grade of 42CrMo
42CrMo4(1.7225)	EN 10263	0.38‑0.45	≤0.40	0.60‑0.90	0.90‑1.20	0.15‑0.25	930	1080	12	European equivalent Cr‑Mo alloy steel

Detailed Technical Specifications

Technical Item	Complete Specification
Product Name	42CrMo 4140 42CrMo4(1.7225) Structural Alloy Steel Bar
Product Category	Structural Alloy Steel Bar
Material Type	Cr‑Mo Alloy Structural Steel
Applicable Standards	GB/T3077, ASTM A322, EN 10263, DIN EN 10083
Available Forms	Round Bar, Square Bar, Hexagonal Bar, Flat Bar
Round Bar Size	Φ10‑350 mm
Square Bar Size	10‑200 mm
Hexagonal Bar Size	S10‑S100
Flat Bar	Custom dimensions available
Delivery Condition	Hot‑Rolled Annealed; Cold‑Drawn Precision; Quenched & Tempered Pre‑Hardened
Grades Included	42CrMo,4140,42CrMo4(1.7225)
Performance Characteristics	High hardenability, excellent toughness, fatigue‑resistance, high‑temperature strength
Quality Documentation	Mill Test Certificate with chemical composition & mechanical property data
Typical Applications	Crankshafts, wind‑power shafts, heavy gears, hydraulic piston rods
MOQ	5 Ton
Trade Term	FOB, CFR, CIF
Payment Terms	T/T, L/C at Sight
Packaging	Bundled with steel strips, waterproof wrapping, seaworthy export packing

Size Specifications Table

Product Form	Size Range	Tolerance Reference	Available Surface
Round Structural Alloy Steel Bar	Φ10 mm–Φ350 mm	Hot rolled: ±0.3–1.5 mm; Cold drawn: ±0.05–0.3 mm	Black, Peeled, Polished
Square Structural Alloy Steel Bar	10 mm–200 mm	Hot rolled: ±0.4–1.8 mm; Cold drawn: ±0.06–0.3 mm	Black, Machined
Hexagonal Structural Alloy Steel Bar	S10–S100 (across-flat dimension)	Cold drawn: ±0.08–0.3 mm	Bright / Black
Flat Structural Alloy Steel Bar	Thickness: 4–100 mm; Width: 20–300 mm	Hot rolled: ±0.5–2 mm	Black / Milled

Product Comparison Table

GB Grade	ASTM Equivalent	EN/DIN Equivalent	Density(g/cm³)	Hardenability	Main Feature	Typical Application
42CrMo	4140	42CrMo4(1.7225)	7.85	High	Excellent toughness, high‑temperature strength, fatigue resistance	Crankshafts, wind power shafts, heavy gears, hydraulic piston rods

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Wind Turbine Main Shaft Blank

Mining Wear-Resistant Parts

Automotive Transmission Gears

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

Are 42CrMo, 4140 and 42CrMo4(1.7225) fully interchangeable?

They are equivalent grades for most working scenarios, minor difference on chemical range, we will confirm for your drawing requirement before order.

Can you supply pre‑hardened quenched & tempered 42CrMo bar?

Yes, pre‑hardened bar can be provided to save your local heat‑treatment process.

What maximum diameter you can produce for 42CrMo round bar?

Max round bar Φ350mm, custom big size can be negotiated.

Can I mix different shapes within 5 tons MOQ?

Yes, round / square / hex bar mixed order for same grade is supported.

What is the main advantage of Cr‑Mo 42CrMo series compare to 40Cr?

Better hardenability, higher toughness and fatigue‑resistance for heavy‑load rotating components.

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42CrMo 4140 42CrMo4(1.7225) Structural Alloy Steel Bar GB ASTM EN