30CrMnSiA Alloy Steel Round Bar GB/T 3077 Hot Rolled Forged 20-300mm for High Strength Shafts

30CrMnSiA Alloy Structural Steel Round Bar

30CrMnSiA is a chromium-manganese-silicon alloy structural steel to GB/T 3077 with high hardenability and excellent strength-to-toughness balance after quenching and tempering. It is widely used for parts requiring high strength and good fatigue resistance, such as shafts, gears, bolts and aircraft components. Supplied as hot rolled or forged round bars with full material traceability.

Product Specifications

Key Advantages

• High strength: after quenching and tempering reaches tensile strength ≥ 1080 MPa with good impact toughness.
• Good hardenability: chromium and manganese ensure through-hardening of medium sections.
• Fatigue resistance: suitable for dynamically loaded shafts, gears and bolts.
• Machinability: supplied in annealed or Q+T condition for easy machining and heat treatment at your plant.
• Traceability: each heat comes with mill test certificate (MTC), SGS/BV inspection on request.

Applications

High-strength shafts, gears, connecting rods, fasteners and bolts, aircraft and aerospace structural parts, machinery transmission components and pressure vessel fittings.

Packing & Delivery

• Standard export packing: steel strip bundled, wooden pallet or as your request.
• Approx. 20-25 tons per 20ft container.
• Delivery: 7-20 days after receipt of deposit.

Why Choose Us

Jiangsu Mittel Steel Industrial Limited has supplied alloy steel, stainless steel and carbon steel products since 1998. With an 80-90% export share and 15,000 tons in stock, we back every shipment with SGS, BV and ISO 9001:2015 certification. Custom grades, diameters and heat treatment conditions are available on request.