AISI 4340 Alloy Steel  Round Bar

Applications: 
 

• AISI 4340 Alloy Steel Used for manufacture big sized important Quenched-and-Tempered parts which request good toughness and high strength. Such as top load shaft in heavy-duty machinery. 
• AISI 4340 Alloy Steel Used for steam turbine shaft, vane, and heavy-load transmission parts, fastening piece, crankshaft, gears etc. With diameter is biger than 250mm. 

Description: 

1. AISI 4340/GB40CrNiMo/DIN 1.6511 alloy steel round bar

2. Hot rolled or forged condition, annealing, black or milled surface

3. Hardness: ≤220HBS; 

4. Hot rolled technology: EAF+LF+VD

Forged technology: EAF+LF+VD+ESR+Forging +Q T + Machined surface

5. Ultrasonic test standard: SPE1921-GR3, CLASS D/D or E/E

6. Production leadtime: 7~10 days

Competitive Advantage: 

• High strength, 
• High tenacity
• Good hardenability
• High resistance to thermal properties. 
• Competitive price
• Fast production leadtime
• All the material are inspected with 3 times to meet the highly standards

DongGuan RuiYuan Steel Co., Ltd Specializes in plastic mould steel, hot work mould steel,

cold work mould steel alloy steel and carbon structural steel, such as: P20, P20+Ni, 1.2714,

1.2083, 1.2316, H13, O1, D2, D3, D5, 1045, 1050, A3, 52100(EN31), 4137, 4140, 4340,

5140, 6150, 8620 and SCM420 for exporting over 20 countries now, such as: Brazil, India,

Turkey, Italy, Germany, Korea, Malaysia, Iran and so on. 

Our company have introduced large-sized Vertical saw machines, horizontal saw machines,

Milling machines, Grinding machines and other advance equipments, we can export our

products by wholesales and retail sales, whole plate or strip is available. All our products

can meet the standards of DIN, AISI, JIS and GB, all the material should be inspected the

ultrasonic, hardness and others strict inspection process before the shipment!