9Cr2Mo Forging Alloy Round Steel Special for Cold Rolling Roll

9Cr2Mo Chemical Composition

It is normally produced via the process flow of EAF electric arc furnace melting + LF ladle refining + VD vacuum degassing + forging + finishing + non-destructive testing, to ensure the purity and performance of the material.

Heat Treatment

Spheroidizing Annealing (Softening)

 Heat to 790–810°C, hold isothermally at 650–670°C, followed by furnace cooling.

• Cooling media such as water, PAG quenchant or oil can be selected according to workpiece structure and technical requirements.

Tempering

Low-temperature tempering is generally performed at 130–170°C to relieve stress and maintain high hardness (60–65 HRC).

Feature

• High Hardness and High Wear Resistance: Designed with high carbon (~0.9%) and high chromium (~2%), it can reach a hardness of HRC 60~62 after heat treatment, delivering excellent wear resistance.
• Excellent Hardenability: Molybdenum (Mo) significantly improves hardenability. Workpieces above Φ50 mm can be fully oil-quenched, ensuring uniform hardness in large cross-sections.
• Good Forgeability: The forging ratio is generally required to be ≥ 4:1. Controlled forging processes can refine grains and eliminate network carbides.
• Good Dimensional Stability: Low deformation during heat treatment, suitable for manufacturing high-precision parts.

Typical Application

Roll manufacturing——primary application

It is used for cold rolling work rolls, backup rolls and straightening rolls, and is widely applied in plate and strip cold rolling mills.

Cold work dies

Precision blanking dies, cold heading dies, cold extrusion dies, punches, coining dies, etc.

Wear-resistant parts

Mechanical components requiring high wear resistance and high precision, such as measuring tools, cutting tools, feed nozzles and so on.

Delivery condition

9Cr2Mo forged round steel is generally delivered in the annealed condition with a hardness of ≤HB 229 .

Diameter range:  Φ100 mm to Φ800 mm.

Length: Customizable as required, with a  range of 1 to 10 meters.

Supply form: black surface or bright machined bars after turning processing.

Relevant Equipment

• 2000 tons fast forging press production line

• Heating furnace