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TECHNICAL GUIDE

PUNCHING TOOLS

Vol.11 MATERIAL PROPERTIES (STEEL)

TECHNICAL GUIDE

PUNCHING TOOLS

Vol.11 MATERIAL PROPERTIES (STEEL)

In the turret punch press, various materials (workpieces) are processed.
The materials used for sheet metal processing are various, such as steel and nonferrous metals,
and the names also differ according to each maker.
This time, we summarized the typical steel materials for metal forming.

TYPICAL METAL FORMING MATERIALS

TYPICAL METAL FORMING MATERIALS
COLD ROLLED STEEL SHEET

It is a typical steel material of sheet metal material rolled at near normal temperature.
It is inexpensive in price and good in processability, and it is a plate material whose surface is clean because it is rolling at normal temperature.
Usually SPCC (for general use) is often used, but if problems occur with forming, we recommend SPCD (for forming) and SPCE (for deep forming).

COLD ROLLED STEEL SHEET
HOT ROLLED STEEL SHEET

It is a material rolled at high temperature and has plate thickness of 1.2 ~ (14)mm.
Because of hot rolling, scales are attached to the surface of the plate.
There are also steel plates that have been removed scales by acid cleaning or shot blasting.
It is recommended to take a slightly wider clearance than the Cold Rolled Steel.

Material JIS symbol Thickness mm Remark Tensile Strength N/mm² Elongation %
Cold Rolled Steel SPCC 0.4 - 3.2 General (Over 270) (Over 32 - 39)
SPCD 0.4 - 3.2 For Emboss Over 270 Over 35 - 41
SPCE 0.4 - 3.2 For Deep Emboss Over 270 Over 36 - 43
Hot Rolled Steel SPHC 1.2 - 14 General Over 270 Over 27 - 31
SPHD 1.2～14 For Emboss Over 270 Over 30 - 39
SPHE 1.2 - 6 for Deep Emboss Over 270 Over 31 - 41

＜ Reference ＞1² N/mm ≒ 0.102kgf/mm²

ELECTRIC GALVANIZED STEEL SHEET

Electrogalvanized on cold-rolled steel sheet and hot-rolled steel sheet raw material,
widely used for home appliances, automotive parts, etc.

SYMBOL OF ELECTRIC GALVANIZED STEEL SHEET

Material Thickness Remark Symbol Original Sheet
Cold Rolled Steel 0.4 - 3.2 General
For Emboss
For Deep Emboss		 SECC SPCC
SECD SPCD
SECE SPCE
Hot Rolled Steel 1.6 - 4.5 General
For Emboss
For Deep Emboss		 SEHC SPHC
SEHD SPHD
SEHE SPHE
HOT-DIP GALVANIZED STEEL SHEET

Hot-dip galvanized steel sheet is a material obtained by hot-dip galvanizing plating of cold-rolled steel sheet or hot-rolled mild steel plate,
has high corrosion resistance due to thick plating layer,
and is used for exterior building materials and outdoor equipment.

ADVICE ON ONE POINT

When punching a plated steel sheet, the plating may peel off and enter the inside of the tool (sliding part),
which may cause seizure. It is advisable to carry out maintenance earlier and remove the plating powder.
In addition, since welding of the cutting edge is likely to occur, coating treatment is recommended.

STAINLESS STEEL

Stainless steel is excellent in corrosion resistance, it is hard to rust and it is used for many industrial products.
However, there are disadvantages such as hard processability and high price compared to SPCC and SECC.

Symbol Tensile Strength Note N/mm² Elongation % Note
SUS304 Over 520 Over 40 Austenite
SUS430 Over 450 Over 22 Ferrite

ADVICE ON ONE POINT

Because stainless steel has hard processability,
we recommend using a long-life super dry punch without processing oil in punching.
We also recommend coating the punch for forming tooling such as burring.

Knowing the material and characteristics of the material (workpiece),
making appropriate selection of tool
(material, coating etc.), processing conditions (clearance etc.) will lead to improve the quality of the product and reduction of cost.

For the clearance of each material, please refer to “FOR CLEARANCE OF THE CUTTING DIE Vol.6 ”.

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