Pmm4 Powder Metallurgy Steel Plate 2500-5500mm

• 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 M4Our PM M4 high-speed tool steel offers unparalleled versatility, combining robust wear-resistance with exceptional impact toughness and bend strength. This unique material is characterized by its fine grain structure, minimal carbides, and superior steel cleanliness. PM M4Enhance your cutting tool longevity with PM M4, outperforming traditional M1,M2,,M7,and other low-alloy high-speed steels. It shines in cold work tooling, significantly outlasting high-carbon, high-chromium die steels like D2 and D3.

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

Common Usage

Ideal for 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

Achieves 40-45% efficiency compared to 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:
Gradually heat at a rate not exceeding 400°F per hour (222°C per hour) until reaching 1500-1600°F (816-871°C), then equalize.

Austenizing (High Heat):

Rapidly heat from preheat.

For Cutting Tools:

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

For Cold Work Tooling:

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

Use the lowest temperature to maximize toughness and the highest temperature to enhance hot hardness.
Quenching:
Employ pressurized gas, warm oil, or salt.

For pressurized gas, ensure the furnace has a minimum quench pressure of 4 bars. Achieving a quench rate of approximately 400°F (222°C) per minute until below 1000°F (538°C) is critical for desired properties.

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

For salt bath quenching, maintain the temperature between 1000-1100°F (538-593°C). Equalize the steel in the salt before cooling it in still air to 150-125°F (66-51°C).

Tempering:

Begin tempering immediately after quenching to ensure optimal performance.
The typical tempering temperature range is 1000-1100°F (538-593°C). Never temper below 1000°F (538°C). Maintain the temperature for 2 hours, then allow the material to air cool to ambient temperature. Double tempering is required, and triple tempering is necessary when austenitized at 2100°F (1149°C) or higher.

Annealing:

Annealing should be conducted after hot working and prior to re-hardening to ensure material integrity.

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