Custom Nf X200cr12 Steel Block Excellent Hardenability - China

The NF X200Cr12 steel block is classified as a high-carbon, high-chromium cold-work tool steel.

It possesses truly exceptional hardenability, ranking among the typical "deep-hardening, full-section hardening" grades within the category of ledeburitic steels.

**Why does X200Cr12 possess exceptional hardenability?**

**Core Reason: High-Chromium + High-Carbon Alloy Design**

- **Composition (NF Standard): **

- C: **1.9–2.2%**

- Cr: **11.0–13.0%**

- Si, Mn: Trace amounts

- **Role of Cr: ** **Significantly enhances hardenability** and markedly lowers the critical cooling rate; **oil quenching alone is sufficient to achieve a martensitic structure.

**

- **Microstructural Characteristics: ** As a hypereutectoid steel, it contains an **abundance of eutectic carbides.

** Following austenitization, the austenite exhibits **high alloy content and strong stability**, making it resistant to the premature precipitation of pearlite or bainite during the cooling process.

**Advantages of Exceptional Hardenability (for Steel Blocks)**

1 - **Through-Hardening of Large Blocks**

- For steel blocks with a thickness or diameter in the **200 mm range**, **oil quenching alone ensures uniform, high hardness throughout the entire cross-section.

**

2 - **Minimal Distortion and Dimensional Stability**

- The requirement for a slow cooling rate results in **low internal stress**, yielding a **heat treatment distortion rate of < 0.02%**.

3 - **No Need for Water Quenching; Low Risk of Cracking**

- Oil quenching provides sufficient hardenability, thereby **avoiding the risk of cracking associated with the rapid thermal shock of water quenching.

**

4 - **Suitable for Complex Mold Shapes**

- Ensures **uniform hardness—both internally and externally—** for molds featuring deep cavities, thick walls, or irregular cross-sections.

**Summary**

The NF X200Cr12 steel block belongs to the top tier of cold-work tool steels in terms of hardenability.

For blocks in the 200 mm size range, oil quenching achieves full-section high hardness with minimal distortion and no cracking, making it an ideal choice for large-scale, thick-section, and high-precision cold-work molds.

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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