Technical Information

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
Cold Rolled steel sheet (SPCC,SPCD,SPCE)
Hot Rolled steel sheet (SPHC,SPHD,SPHE)Electric Galvanized Steel Sheet (SECC,SEHC,SEHD,SEHE,SECE)

Steel

Hot-Dip Galvanized Steel Sheet (SGC,SGH)
Tin Plate (SPB,SPTE,SPTH)
Rolled Steel for General Structure (SS400 etc.)

Major sheet metal

Stainless Steel (SUS304,SUS430 etc.)
Spring Steel (SUP)
Nonferrous
metalsAlminum and aluminum alloy (A1050,A5052,A2014 etc.)
Copper and copper alloy (C1100,C2600,C5212 etc.)

COLD ROLLED STEEL SHEETIt 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).
SPCC - S D
Surface finish (D:Dull finish, B:Bright finish)
Thermal refining (S : Standard refning,

A : Annealing,

1 : Hardness)

HOT ROLLED STEEL SHEETIt 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.
MaterialGeneral(Over 270)

(Over 32 - 39)

0.4 - 3.2For Emboss

Over 270

Over 35 - 41

SPCE

0.4 - 3.2

For Deep Emboss

Over 270

Over 36 - 43

SPHC

1.2 - 14General

Over 270

Over 27 - 31

SPHD

1.2 - 14For Emboss

Over 270

Over 30 - 39

SPHE

1.2 - 6

For Deep Emboss

Over 270

Over 31 - 41

SPCC

0.4 - 3.2

SPCD

Hot Rolled Steel

2

Elongation%ThicknessmmCold Rolled Steel<Reference> 1 N/mm

Tensile StrengthN/mm 2JIS symbol

0.102kgf/mm

Remark2Continue to the next page

MATERIAL PROPERTIES (STEEL)ELECTRIC GALVANIZED STEEL SHEETElectrogalvanized 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
MaterialThickness

Cold Rolled
Steel
Hot Rolled
Steel

0.4 - 3.2

1.6 - 4.5

RemarkSymbol Original SheetGeneral

SECC

SPCC

For Emboss

SECD

SPCD

For Deep Emboss

SECE

SPCEGeneral

SEHC

SPHCFor Emboss

SEHDSPHD

For Deep Emboss

SEHESPHE

HOT-DIP GALVANIZED STEEL SHEETHot-dip galvanized steel sheet is a material obtained by hot-dip galvanizing plating of cold-rolled steel sheetor hot-rolled mild steel plate, has high corrosion resistance due to thick plating layer, and is used for exteriorbuilding materials and outdoor equipment.
When punching a plated steel sheet, the plating may peel off and enter the insideof the tool (sliding part), which may cause seizure. It is advisable to carry out
maintenance earlier and remove the plating powder. In addition, since weldingof the cutting edge is likely to occur, coating treatment is recommended.

ADVICE ON
ONE POINTSTAINLESS 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.
SymbolTensile Strength
N/mm²

Elongation%

Note

SUS304

Over 520

Over 40

Austenite

SUS430Over 450

Over 22Ferrite

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 productand reduction of cost.
For the clearance of each material, please refer to “FOR CLEARANCE OF THE CUTTING DIE Vol.6 ”.
For More information,please contact
CONIC tool sales desk.