ステロイド 市販

ステロイド 市販
 
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Free Cutting Steels

Quality Requirement for Free Cutting Steels

  • Uniform distribution of MnS
  • Hardness
  • Microstructure
  • Dimentional quality
  • Straightness

Typical Co-Relation of Machining Parameters With Elemental Levels

Machining (Force) Torque

Effect of ‘s‘ content on the machining torque.

Surface Hardness HB

Free machining steels are generally used after cold processing such as drawing, peeling, grinding etc. The extent of cold work employed in converting black bar of free machining steel into bright bar, decides its surface hardness,which in turn is responsible for its machining performance.

Certification of Quality

  • Surface condition : Free from defects
  • Macro etch test (ASTM: E-381)
  • Spark/Spectral test — 100% bars
  • As rolled hardness – Free Cutting Steels <150 BHN
  • Inclusion rating – (ASTM – E-45) 2.5 max each – B, C,D
  • Micro structure – Sulphide morphology (Aspect Ratio)

International Specifications of Free Cutting Steels

International Specifications of Semi Free Cutting Steels

Sizes and Conditions of Supply

Condition of Supply Shapes Sizes

1. Black

Hex 15.5 mm — 38 mm A/F
2. Black Round 5.5 mm — 100 mm dia
3. Black WRD 5.5 mm — 38 mm dia
4. Drawn Hex 14 mm – 36 mm A/F
5. Drawn Round 10mm — 50 mm die
6. Peeled & Ground Round 10 mm — 90 mm dia