Asp2004 High Speed Steel Smooth Trademark

• Type: Special Steel Bar
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Composition: Stainless Steel Scrap
• Technique: Forged
• Shape: Bar
• Surface Treatment: Polished
• Model NO.: powder high speed steel
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel
• Application: Die Steel Bar
• Length: 2500-5500mm
• Transport Package: N/M
• Specification: 6-400mm
• Trademark: Smooth
• Origin: China
• HS Code: 7226911000
• Production Capacity: 1000ton/Month

Product Description

PM M4The high-speed tool steel is a versatile material that offers an exceptional blend of high wear resistance, impressive impact toughness, and remarkable bend strength. These superior attributes stem from its fine grain size, small carbide distribution, and exceptional cleanliness. PM M4This advanced steel significantly enhances the lifespan of cutting tools, outlasting conventionally-wrought M1 steel.M2, M7 and other lower-alloyed high-speed steels. It is particularly outstanding in cold work tooling applications, where it surpasses high-carbon, high-chromium die steels like D2 and D3 in longevity.

Other Known Names:CPM REX M4 steel^®, ASP 2004, S690

Common Usage

Commonly used in Broaches, End Mills, Punches, Hobs, Fine Blanking, and Forming Dies.

Physical Properties

Density

0.286 lb/in³ (7806 kg/m³)

Specific Gravity

7.92

Modulus Of Elasticity

31 x 10⁶ psi (214 GPa)

Machinability

40-45% of a 1% carbon steel

PM M4 High Speed Steel Chemical Composition

						MAXIMUM	TYPICAL
Carbon	Chromium	Tungsten	Molybdenum	Vanadium	Cobalt	Annealed	Tempered
C	Cr	W	Mo	V	Co	Hb	HrC
1.4	4	5.65	5.2	4	-	255	65

PM M4 High Speed Steel Heat Treating

ANNEALING	PREHEAT	AUSTENITIZING	QUENCH	TEMPERING
Temp	Temp	Temp	Medium	Temp
°F	°F	°F		°F
1550/1600	1500/1550	2175/2220	Salt/Oil/Atm	1025/1050

PM M4 High Speed Steel Thermal Treatments

Preheating:
Heat steadily at a rate not exceeding 400°F per hour (222°C per hour) until the temperature reaches 1500-1600°F (816-871°C), and then equalize.

Austenizing(High Heat):

Rapidly heat from the preheat.

For Cutting Tools:

• Soak for 5 to 15 minutes.
• Furnace: 2150-2175°F (1177-1191°C)
• Salt Bath: 2125-2175°F (1163-1191°C)

For Cold Work Tooling:

• Soak for 20 to 45 minutes.
• Furnace: 1875-2125°F (1023-1163°C)
• Salt Bath: 1850-2100°F (1010-1149°C)

For maximum toughness, use the lowest temperature. For maximum hot hardness, use the highest temperature.
Quenching:
Pressurized gas, warm oil, or salt.

For pressurized gas quenching, ensure the furnace achieves a minimum quench pressure of 4 bars. A quench rate of approximately 400°F (222°C) per minute to below 1000°F (538°C) is crucial to attain the desired properties.

For oil, quench until the steel turns black, approximately at 900°F (482°C), then let it cool in still air until it reaches 150-125°F (66-51°C).

For salt bath quenching, maintain the temperature at 1000-1100°F (538-593°C). Equalize the steel in the salt bath, then allow it to cool in still air until it reaches 150-125°F (66-51°C).

Tempering:

Begin tempering immediately after quenching.
The optimal tempering temperature is between 1000-1100°F (538-593°C). Avoid tempering below 1000°F (538°C). Hold the steel at the desired temperature for 2 hours before air cooling to ambient temperature. Double tempering is necessary. If the steel has been austenitized at 2100°F (1149°C) or higher, triple tempering is required.

Annealing:

Annealing is essential after hot working and prior to re-hardening.

Heat gradually, not exceeding 400°F per hour (222°C per hour), until the temperature reaches 1550-1600°F (843-871°C). Hold at this temperature for 1 hour per inch (25.4 mm) of thickness, with a minimum holding time of 2 hours. Subsequently, cool slowly in the furnace at a rate not exceeding 50°F per hour (15°C per hour) until the temperature drops to 1000°F (538°C). Finally, continue cooling to ambient temperature, either in the furnace or in air.