Alloy Steel DC53, Cold Work Steel, High Strength, and High Wear Resistance

• Customization: Available
• Type: Steel Plate
• Standard: AISI, DIN, JIS, GB
• Model NO.: YMT S53
• Shape: Block
• Surface Treatment: Black Primer
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Mold Steel
• Application: Die Steel Bar
• Transport Package: Container or Metal Framework
• Trademark: YMT
• Origin: China
• HS Code: 7224909090

Product Description

YMT S53

YMT S53 cold work tool steel is a medium chromium alloy air-cooled hardened tool steel, which provides good wear resistance and strong comprehensive properties. YMT S53 mainly supplies bars for cold work mold applications. YMT S53 has good comprehensive properties of wear resistance and toughness, high hardness, high dimensional stability and suitable for nitriding, which far surpass other cold work steel grades.

Chemical Composition:
 

Steel grade	C	Si	Mn	Cr	Mo	V	W
% in weight	~1.10	~1.0	~0.35	~7.90	~1.50	~2.10	~1.20

Main Applications
Blanking die, rubbing template, punch, fine stamping die (coin stamping die), drawing die, upsetting die (head punch die), shearing tools, slitting cutter and cutting knife.

YMT S53 and 1.2379
YMT S53 is a quality tool steel with higher wear resistance and higher toughness. Compared with the traditional 1.2379 (D2), it has higher stiffness resistance, better hardenability, and higher hardness and toughness properties. Toughness is very important for tool steels to prevent cracks that can cause irreversible cracking failure of the tool. YMT S53 has higher toughness than conventional cold work tool steels classified 1.2379 (D2).

Preheating
In order to minimize the deformation and internal stress of large or complex molds, two phases preheating are generally adopted, not exceeding the heating speed of 50 OC per hour, heating to 620~680OC, heat preservation evenly and penetrating, and then continue to heat to 820~840OC, for simple molds, only one preheating phase is required to directly heat to temperature 820~840OC.

Austenitization
The quenching furnace or salt bath furnace sets the austenitization temperature of 1040~1080OC, let the workpiece reach uniform heat transmission inside and outside at this temperature. According to the thickness of the workpiece is 25MM, keep it warm for 30 minutes, and or increase the thickness of every 25mm for 15 minutes, if you want to maximize the toughness, use a lower austenitizing temperature. For maximum wear resistance, use a higher austenitization temperature.

Quenching
Heating to 1040~1080OC, quenching media such as air, mineral oil, or inert gas.
If you want to increase the hardness by 1-2 HRC, or stabilize the dimensional stability after quenching, you can carry out sub-zero cryogenic treatment

Delivery status
Spheroidized annealing is delivered up to 240HB, and if it is to be used after forging, it needs to be spheroidized before annealing, and the annealing treatment must be performed after hot forging and/or before quenching.  820~860OC heating, speed does not exceed 50OC/hour, and 25 mm thickness heat preservation for one hour, or at least two hours. Then the furnace is slowly cooled to 660OC, and the cooling rate is less than or equal to 20OC/hour. Subsequently, annealing in the furnace or continuing to cool to room temperature with a hardness of up to 240HB.

Tempering
When the quenched workpiece is cooled to 90~70OC, it should be tempered immediately. Temper at least twice to obtain a homogeneous tempered microstructure. Slowly heat to the tempering temperature, keep the heat in the furnace every 25mm, keep warm for one hour, at least two hours and then air cool, commonly used 150~550OC tempering.

Forging Temperature: 850- 1050^OC

Nitriding
The nitriding process creates a hardened surface layer that gives the material high wear resistance and prevents surface brushing. The nitride layer has a surface hardness of 1300HV.

Surface treatment
In order to reduce friction and improve wear resistance, surface treatment is required. Nitriding or surface coatings such as PVD are recommended.

PVD Physical Vapor Deposition
The physical vapor deposition method is a process of plating the wear-resistant layer at 220~500OC, PVD improves the surface quality of the mold, and the coating can produce an extremely hard surface. It has excellent anti-wear properties. PVD coatings have gained important applications in different areas of high-temperature work. These PVD coatings reduce friction and improve wear resistance to rough materials.



Micro structure diagram :200um
YMT S53                                                                                  




1.2379
Micro structure diagram : 200um