Order For X210cr12 Ledeburitic Steel Hot Rolling Process - China

X210Cr12 Ledeburitic steel is a typical high-carbon, high-chromium ledeburitic cold-work die steel.

The primary challenges in its hot rolling process lie in the fragmentation of coarse eutectic carbides present in the as-cast structure, as well as the material's poor high-temperature plasticity and susceptibility to cracking.

Consequently, the process requires slow preheating, precise temperature zone control, heavy reductions, frequent turning, and controlled slow cooling to produce hot-rolled billets or plates with a uniform microstructure and free from cracks.

Key Points for Hot Rolling (Specific to Ledeburitic Steel)

1 - Rolling Principles

- **Multiple Passes, Small Reductions, Large Total Deformation**

- Single-pass reduction rate: **10–15%** (≤20%)

- Total compression ratio: **≥4–6: 1** (to effectively fracture eutectic carbides)

- **Bidirectional Rolling, Frequent Turning**

- Alternating longitudinal and transverse passes; forging/rolling on all four sides to **eliminate anisotropy and homogenize carbides**

- **Rapid Pace, Minimal Holding Time**

- Inter-pass interval: ≤30s; temperature drop: <30°C per pass

2 - Typical Rolling Process (Ingot → Plate/Bar)

1 - **Ingot Inspection: ** Removal of surface defects, shrinkage cavities, and cracks

2 - **Staged Heating: ** Three-stage preheating (400°C / 700°C / 1100°C) followed by soaking

3 - **Blooming (Rough Rolling)**

- Temperature: 1080–1050°C

- Passes: 6–10 passes; **total reduction rate: 50–70%**

- Objective: **To fracture coarse eutectic carbides**

4 - **Finish Rolling**

- Temperature: 1000–900°C

- Passes: 4–6 passes; **single-pass reduction: 8–12%**

- Objective: Dimensional accuracy, surface quality, and uniform microstructure

5 - **Post-Rolling Treatment (Critical Step)**

- **Immediate Transfer to Furnace for Slow Cooling: ** **Hold at 650–700°C for 4–8 hours; furnace cool to <500°C, then air cool**

- **Strictly Prohibited: ** Stack cooling or open-air cooling (risk of **stress cracking and precipitation of network carbides**).

For X210Cr12 Ledeburitic Steel, the key to successful hot rolling lies in "slow heating, precise temperature control, multiple passes with small deformations, bidirectional rolling with high total compression, and post-rolling slow cooling followed by timely annealing.

" The core objective is to fracture coarse eutectic carbides and prevent thermal stress and low-temperature cracking.

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Company Contact:

• Posted By: Dongguan Songshun Mould Steel Co., Ltd.

• Phone: 076985475596

• Address: 1st Floor, No. 1, Dongda Fourth Street, Shatou Community, Chang'an Town, Dongguan , Guangdong , China

• Email:

• Website: https://songshunsteel.com/

• Business Description: Established in 2009,Songshun Steel supplies a wide range of carbon, alloy and tool steel products, including high speed tool steel, cold work tool steel, hot work tool steel, plastic mould steel, engineering steel and machine structural steel etc.
  
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