High Speed Steel Pmm4 Powder Metallurgy Die

• 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 M4High-speed tool steel PM M4 is an exceptionally versatile material that offers a remarkable blend of high wear-resistance, impact toughness, and bending strength. These superior characteristics are achieved through its fine grain structure, minimal carbide content, and unparalleled cleanliness. PM M4PM M4 provides a significantly enhanced cutting tool life in comparison to traditionally-wrought M1,M2, M7along with other lower-alloyed high-speed steels. It is particularly outstanding in cold work tooling applications, delivering a performance that surpasses high-carbon, high-chromium die steels such as 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

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 gradually, not exceeding 400°F per hour (222°C per hour), up to 1500-1600°F (816-871°C), and allow the temperature to equalize.

Austenizing (High Heat):

Heat quickly from the preheat stage.

For Cutting Tools:

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

For Cold Work Tooling:

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

For maximizing toughness, use the lowest temperature. For maximizing hot hardness, opt for the highest temperature.
Quenching:
Utilize 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 about 400°F (222°C) per minute to below 1000°F (538°C) is essential to meet the desired material properties.

Quenching for Oil: Immerse the material until it turns black, reaching approximately 900°F (482°C). Afterwards, let it cool in still air until it reaches a temperature between 150-125°F (66-51°C).

Quenching for Salt: Maintain the salt bath at a temperature ranging from 1000-1100°F (538-593°C). Allow the material to equalize within the salt bath, then cool in still air until it reaches a temperature between 150-125°F (66-51°C).

Tempering Process:

Begin tempering immediately after quenching to ensure optimal results.
The ideal tempering temperature range is 1000-1100°F (538-593°C). Avoid tempering below 1000°F (538°C). Maintain the temperature for 2 hours, then allow the material to air cool to ambient temperature. Double tempering is a must, and if austenitized at 2100°F (1149°C) or higher, triple tempering is essential.

Annealing Process:

Annealing should be conducted post hot-working and prior to re-hardening for best results.

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