Chinese 
20CrMo‑35CrMo 4340 34CrMo4(1.7220) Structural Alloy Steel Bar Heavy‑Load Cr‑Mo Bar
- Excellent fatigue strength and impact‑resistance for heavy‑load dynamic components
- 20CrMo good weldability after normalizing for pipe‑fitting blank
- 35CrMo /4340 /34CrMo4 ultra‑high hardenability for big cross‑section parts
- Wide size range, multiple delivery condition for forging / machining
- Multi‑standard grades to match global drawing requirements
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Product Overview
20CrMo & 35CrMo series Cr‑Mo structural alloy steel bar, together with ASTM 4340 and EN 34CrMo4(1.7220), manufactured according GB/T3077, ASTM A322, EN10263 standards. 20CrMo is low‑carbon Cr‑Mo alloy steel with good weldability after normalizing; 35CrMo /4340 /34CrMo4 own ultra‑high hardenability, outstanding fatigue and impact‑resistance for heavy‑load dynamic service.
Available forms: round bar, square bar, hexagonal bar, flat bar. Round bar Φ10‑350mm; square bar 10‑200mm; hex S10‑S100. Supply condition includes hot‑rolled annealed, cold‑drawn precision, quenched & tempered pre‑hardened.
Typical usage: carburized pins, high‑pressure pipe fitting blanks, heavy‑load bolts, drill rods, engine shafts, heavy machinery rotating components.
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FAQs
20CrMo low‑carbon with weldable performance;35CrMo higher carbon for higher strength heavy‑load dynamic parts.
4340 contains nickel element for better toughness, it is higher‑grade heavy‑load alloy than 35CrMo.
Yes quenched & tempered pre‑hardened bar can be offered.
Standard MOQ 5 ton, small trial order could be negotiated subject to stock situation.
Custom size available according to customer drawing.
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