1.2550 S1 Sks41 Cold Work Tool Steel

• Type: Steel Plate/Block/Round Bar
• Standard: ASTM, AISI, GB, JIS, DIN, BS
• Certification: ISO
• Surface Treatment: Black/Milled/Turned/Polish
• Technique: Hot Rolled/Forged
• Application: Mold & Dies, Flange Plate
• Model NO.: 1.2550 S1 SKS41
• Special Use: Cutting Tools, Cutters in Common Steel, High-strength Steel Plate, Wear Resistant Steel, Silicon Steel
• Stock: Stock
• Origin: China

Product Description

DIN 1.2550/S1 Cold Work Tool Steel

It's an alloy shock-resisting tool steel which is suited for both hot and cold work applications. The tungsten content of this tool steel grade confers fatigue resistance, the chromium content gives depth of hardness and resistance to abrasion. 1.2550 tool steel is suitable for cold work tools subject to heavy shock and uneven loading. This steel is also used with great success for chisels and punches required for heavy work on hard and tough materials. It is suitable for hot work applications where high fatigue strength in combination with medium hot hardness is desirable. Tools made from this tool steel can be water cooled in service with little risk of cracking.

 

Equivalent Grades:                     

Standard	Grade
AISI/SAE	S1
W.Nr/DIN	1.2550
JIS	SKS41
GB	6CrW2Si

 

Typical Chemical Composition (%)

C	Si	Mn	Cr	W	V
0.55-0.65	0.50-0.70	0.15-0.45	0.90-1.20	1.80-2.10	0.10-0.20

 

Hot Forming:

Forging: 1050 to 850ºC, slowing cooling in furnace.

 

Heat Treatment:

Annealing: 710 to 750ºC, slow cooling in furnace (10-20ºC/hr), down to approx. 600ºC, cooling in air. Hardness after annealing: max. 225HB.

Stress relieving: approx. 650ºC, slow cooling in furnace. Hold in neutral atmosphere for 1 to 2hours.

Hardening: 870 to 900ºC, oil. Hold 15 to 30 minutes. Hardness obtainable, 58 to 62 HRC.

Tempering: for hot work, 550 to 600ºC; for cold work, 200 to 300 ºC. Slowly heating to tempering temperature right after hardening. Recommended to temper 2 or 3 times to increase toughness.

Tempering   ºC	200	300	400	500
HRC	60	57	54	49

* Hardening temperature: 880ºC, specimen size: dia25mm

 

Surface treatment:

Nitriding: suitable for both bath or gas nitriding.

 

Properties:

Tough, shockproof steel with fairly good edge retaining properties. Moderate deep hardening properties in case of long sections.

 

Applications:

Suited for both hot and cold work applications. Cutting tools (dies and punches) for the processing of plate; cold punches and shear blades; wood working, coining and pneumatic tools. Hot work tools for use at moderate heat.

 

Available Size:
Round:	Dia   12-120mm	Hot rolled
	Dia   50-600mm	Forged
Flat/Square:	Thickness	8-120mm	Hot Rolled
		20-600mm	Hot Forged
	Width	800mm Max.