Manufacture Of Bd3 Steel Bar Vacuum Degassing And Refining - China

Based on the search results, I can provide you with comprehensive information about BD3 steel bar and its relationship with vacuum degassing refining (VD).

## Vacuum Degassing Refining (VD) for BD3 Steel Bar

While the search results do not provide specific technical papers on "BD3 + VD" combined processes, the metallurgical principles and industry practices for high-chromium tool steels like BD3/D3 are well established: ### Why VD is Critical for BD3/D3 Steel

1 - **Hydrogen Control**: High-carbon tool steels are extremely susceptible to hydrogen-induced cracking (HIC) and flaking.

VD reduces dissolved hydrogen from ~5-8 ppm to <2 ppm, preventing white spot defects.

2 - **Oxygen Reduction**: VD reduces total oxygen content (T.O.) from ~50-80 ppm to <20 ppm, minimizing oxide inclusions that act as crack initiation sites in carbide-rich matrices.

3 - **Nitrogen Management**: Controlled nitrogen levels prevent gas porosity and ensure consistent mechanical properties.

4 - **Sulfur Removal**: Combined with LF (Ladle Furnace) refining, VD helps achieve sulfur levels <0.010%, improving machinability and transverse toughness.

### Typical Refining Route for Premium BD3 steel bar **EAF → LF → VD → ESR (Optional) → Forging/Rolling → Annealing** - **EAF**: Electric Arc Furnace melting

- **LF**: Ladle Furnace for temperature and composition adjustment

- **VD**: Vacuum Degassing at 0.5-1 mbar for 15-30 minutes

- **ESR**: Electroslag Remelting (for highest purity grades)

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.
  
  After more than 10 years development and growing, Songshun Steel becomes one comprehensive special steel factory, stockist and exporter.
  
  Combined with experienced exporting team and professional technical knowledge, Songshun Steel offers both technical advice and support, as well as global professional steel solution and service.
  
  Due to satisfactory reliable quality and professional service, Songshun expands our market worldwide, such as Colombia, Chile, Spain, Turkey, Iran, Vietnam, Malaysia ,UAE, Canada, Brazil, Mexico and so on.
  
  Songshun specialized in Special Steel for almost 20 years.
  
  We can supply mold steel, high speed steel, alloy steel, free cutting steel and etc.
  
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